/*
 * Neuro Academy — App
 * Responsive: mobile full-bleed → tablet 2-col → desktop 3-col dashboard.
 * Design language: bento grid + neural instrument + editorial typography.
 */

/* ============================================================
   BASE
   ============================================================ */
:root {
  --app-radius: 18px;
  --app-radius-lg: 22px;
  --app-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --app-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --app-tx-fast: 180ms;
  --app-tx: 280ms;
  --app-tx-slow: 420ms;

  --sidebar-w: 240px;
  --rail-w: 320px;
}

.app-page {
  min-height: 100vh;
  background: var(--na-color-surface);
  color: var(--na-color-on-surface);
  font-family: var(--na-font-sans);
  overflow-x: hidden;
}

[data-theme="light"] .app-page {
  background: #F4F5FA;
}

/* ============================================================
   AMBIENT BACKGROUND — soft, never dominant
   ============================================================ */
.app-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.app-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(143, 168, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 168, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 0%, transparent 70%);
}
[data-theme="light"] .app-bg::before {
  background-image:
    linear-gradient(rgba(61, 91, 217, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 91, 217, 0.05) 1px, transparent 1px);
}
.app-bg__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.32;
  mix-blend-mode: screen;
  will-change: transform;
}
.app-bg__glow--a {
  width: 60vw; height: 60vw;
  top: -20vw; right: -10vw;
  background: radial-gradient(ellipse, #5B5BFF, transparent 60%);
  animation: bg-drift-a 28s ease-in-out infinite alternate;
}
.app-bg__glow--b {
  width: 60vw; height: 60vw;
  bottom: -25vw; left: -15vw;
  background: radial-gradient(ellipse, #7A3FE4, transparent 60%);
  animation: bg-drift-b 34s ease-in-out infinite alternate;
}
[data-theme="light"] .app-bg__glow {
  opacity: 0.18;
  mix-blend-mode: multiply;
}
@keyframes bg-drift-a {
  to { transform: translate(-6vw, 8vw) scale(1.12); }
}
@keyframes bg-drift-b {
  to { transform: translate(8vw, -6vw) scale(1.15); }
}
@media (prefers-reduced-motion: reduce) {
  .app-bg__glow { animation: none; }
}

/* ============================================================
   APP LAYOUT — responsive shell
   ============================================================ */
.app-shell {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 100vh;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .app-shell {
    grid-template-columns: 220px 1fr;
  }
}

@media (min-width: 1280px) {
  .app-shell {
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--rail-w);
  }
}

/* ============================================================
   SIDEBAR (tablet+)
   ============================================================ */
.app-sidebar {
  display: none;
}

@media (min-width: 768px) {
  .app-sidebar {
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    border-right: 1px solid var(--na-color-glass-border);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    gap: 24px;
  }
  [data-theme="light"] .app-sidebar {
    border-color: rgba(15, 23, 42, 0.06);
    background: rgba(255, 255, 255, 0.5);
  }
  .app-sidebar::-webkit-scrollbar { width: 0; }
}

.app-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px;
  text-decoration: none;
  color: var(--na-color-on-surface);
}
.app-brand__mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid;
  place-items: center;
  color: var(--na-color-neutral-0);
  flex-shrink: 0;
  position: relative;
}
.app-brand__mark::after {
  content: "";
  position: absolute;
  top: -3px; right: -3px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #6E8BFF;
  box-shadow: 0 0 8px #6E8BFF;
  animation: synapse-blink 2.4s ease-in-out infinite;
}
.app-brand__mark svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.app-brand__name {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.app-brand__name b {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.app-brand__name span {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 1px;
}

@keyframes synapse-blink {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50%      { opacity: 1;   transform: scale(1.15); }
}

.app-sidebar__group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.app-sidebar__head {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  padding: 0 12px 8px;
}

.app-navlink {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--na-color-on-surface-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: background var(--app-tx-fast) var(--app-ease),
              color var(--app-tx-fast) var(--app-ease),
              transform var(--app-tx-fast) var(--app-ease);
  position: relative;
}
.app-navlink:hover {
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
}
.app-navlink[aria-current="page"] {
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.20), rgba(122, 63, 228, 0.16));
  color: var(--na-color-on-surface);
  box-shadow: inset 0 0 0 1px rgba(143, 168, 255, 0.25);
}
[data-theme="light"] .app-navlink[aria-current="page"] {
  background: linear-gradient(135deg, rgba(61, 91, 217, 0.10), rgba(108, 50, 204, 0.08));
  box-shadow: inset 0 0 0 1px rgba(61, 91, 217, 0.20);
}
.app-navlink[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 60%;
  border-radius: 999px;
  background: linear-gradient(180deg, #5B5BFF, #7A3FE4);
}

.app-navlink svg {
  width: 18px; height: 18px;
  stroke: currentColor; fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
  flex-shrink: 0;
}
.app-navlink__count {
  margin-left: auto;
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--na-color-glass-border);
  color: var(--na-color-on-surface-muted);
}
.app-navlink[aria-current="page"] .app-navlink__count {
  background: rgba(91, 91, 255, 0.30);
  color: var(--na-color-on-surface);
}

.app-sidebar__upgrade {
  margin-top: auto;
  padding: 16px;
  border-radius: 14px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122, 63, 228, 0.30), transparent 60%),
    rgba(91, 91, 255, 0.12);
  border: 1px solid rgba(143, 168, 255, 0.20);
  position: relative;
  overflow: hidden;
}
[data-theme="light"] .app-sidebar__upgrade {
  background:
    radial-gradient(ellipse at 100% 0%, rgba(108, 50, 204, 0.12), transparent 60%),
    rgba(61, 91, 217, 0.06);
  border-color: rgba(61, 91, 217, 0.18);
}
.app-sidebar__upgrade-eyebrow {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .app-sidebar__upgrade-eyebrow { color: var(--na-color-primary-700); }
.app-sidebar__upgrade-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 6px 0 10px;
  color: var(--na-color-on-surface);
}
.app-sidebar__upgrade-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--na-color-on-surface);
  color: var(--na-color-surface);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  border: none;
}

/* ============================================================
   MAIN
   ============================================================ */
.app-main {
  padding: 16px 16px 96px;
  min-width: 0;
}

@media (min-width: 768px) {
  .app-main { padding: 24px 28px 32px; }
}
@media (min-width: 1280px) {
  .app-main { padding: 32px 36px; }
}

/* ============================================================
   TOPBAR
   ============================================================ */
.app-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.app-greet { flex: 1; min-width: 0; }
.app-greet__line {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.app-greet__name {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--na-color-on-surface);
  margin-top: 2px;
}
@media (min-width: 1024px) {
  .app-greet__name { font-size: 26px; }
}

.app-cmd {
  display: none;
  align-items: stretch;
  height: 40px;
  border: 1px solid var(--na-color-glass-border);
  border-radius: 12px;
  font-family: var(--na-font-mono);
  font-size: 12px;
  overflow: hidden;
  flex: 0 1 360px;
  transition: border-color var(--app-tx-fast) var(--app-ease),
              box-shadow var(--app-tx-fast) var(--app-ease);
  background: var(--na-color-glass-tint);
}
.app-cmd:hover {
  border-color: rgba(143, 168, 255, 0.40);
  box-shadow: 0 0 0 4px rgba(91, 91, 255, 0.08);
}
@media (min-width: 768px) { .app-cmd { display: flex; } }

.app-cmd__prompt {
  background: var(--na-color-on-surface);
  color: var(--na-color-surface);
  padding: 0 12px;
  display: grid; place-items: center;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.app-cmd__field {
  flex: 1;
  padding: 0 12px;
  display: flex;
  align-items: center;
  color: var(--na-color-on-surface-muted);
}
.app-cmd__caret {
  width: 8px;
  background: var(--na-color-primary-500);
  animation: caret-blink 1.1s steps(1) infinite;
}
.app-cmd__kbd {
  margin: 0 10px 0 0;
  align-self: center;
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--na-color-glass-border);
  color: var(--na-color-on-surface-muted);
}
@keyframes caret-blink {
  50% { opacity: 0; }
}

.app-iconbtn {
  width: 40px; height: 40px;
  border: 1px solid var(--na-color-glass-border);
  background: transparent;
  border-radius: 12px;
  color: var(--na-color-on-surface);
  cursor: pointer;
  display: grid; place-items: center;
  position: relative;
  transition: background var(--app-tx-fast) var(--app-ease),
              border-color var(--app-tx-fast) var(--app-ease),
              transform var(--app-tx-fast) var(--app-ease);
}
.app-iconbtn:hover {
  background: var(--na-color-glass-tint);
  border-color: rgba(143, 168, 255, 0.30);
}
.app-iconbtn:active { transform: scale(0.94); }
.app-iconbtn svg {
  width: 18px; height: 18px;
  stroke: currentColor; fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.app-iconbtn__dot {
  position: absolute;
  top: 6px; right: 6px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #F25E62;
  border: 2px solid var(--na-color-surface);
}
.app-iconbtn [data-icon-light] { display: none; }
[data-theme="light"] .app-iconbtn [data-icon-dark] { display: none; }
[data-theme="light"] .app-iconbtn [data-icon-light] { display: inline-block; }

.app-avatar {
  width: 40px; height: 40px;
  flex-shrink: 0;
  display: grid; place-items: center;
  color: var(--na-color-neutral-0);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: -0.01em;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  cursor: pointer;
}

/* ============================================================
   BENTO HERO ROW (responsive)
   ============================================================ */
.app-bento {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 12px;
}

@media (min-width: 1024px) {
  .app-bento {
    grid-template-columns: 1.2fr 1fr 1fr;
  }
}

/* Streak — ticket-cut */
.bento {
  border-radius: var(--app-radius);
  padding: 16px;
  position: relative;
  overflow: hidden;
  transition: transform var(--app-tx) var(--app-ease),
              box-shadow var(--app-tx) var(--app-ease);
}
.bento:hover {
  transform: translateY(-2px);
}
.bento--streak {
  background: linear-gradient(135deg, #5B5BFF 0%, #7A3FE4 100%);
  color: var(--na-color-neutral-0);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  min-height: 138px;
}
.bento--streak::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(-45deg, transparent 0 8px, rgba(255,255,255,0.06) 8px 10px);
  pointer-events: none;
}
.bento--streak:hover {
  box-shadow: 0 18px 40px -12px rgba(91, 91, 255, 0.55);
}

.bento__label {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  opacity: 0.85;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
}
.bento__label::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}
.bento__num {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
  margin-top: 8px;
  font-variant-numeric: tabular-nums;
  position: relative;
}
.bento__num em {
  font-style: normal;
  font-size: 14px;
  font-weight: 600;
  margin-left: 4px;
  letter-spacing: 0;
  opacity: 0.85;
}
.bento__sub {
  font-size: 11px;
  opacity: 0.85;
  margin-top: 4px;
  position: relative;
}
.bento__week {
  position: absolute;
  bottom: 14px; right: 16px;
  display: flex; gap: 3px;
}
.bento__week span {
  width: 6px; height: 14px;
  border-radius: 1px;
  background: rgba(255, 255, 255, 0.30);
}
.bento__week span.is-on { background: var(--na-color-neutral-0); }

/* Today — inverted block */
.bento--today {
  background: var(--na-color-on-surface);
  color: var(--na-color-surface);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 138px;
}
.bento--today .bento__label { opacity: 0.65; }
.bento--today .bento__label::before { box-shadow: none; }
.bento--today:hover { box-shadow: 0 18px 40px -12px rgba(0,0,0,0.40); }
[data-theme="light"] .bento--today:hover { box-shadow: 0 18px 40px -12px rgba(15, 23, 42, 0.30); }

/* XP — outlined */
.bento--xp {
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  display: none;
  flex-direction: column;
  justify-content: space-between;
  min-height: 138px;
}
@media (min-width: 1024px) { .bento--xp { display: flex; } }
.bento--xp .bento__num em { opacity: 0.55; }
.bento--xp .bento__label { color: var(--na-color-primary-300); }
[data-theme="light"] .bento--xp .bento__label { color: var(--na-color-primary-700); }
.bento--xp:hover {
  border-color: rgba(143, 168, 255, 0.35);
  box-shadow: 0 18px 40px -12px rgba(91, 91, 255, 0.20);
}

/* ============================================================
   STAT STRIP — only mobile/tablet (desktop merges into bento)
   ============================================================ */
.app-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 24px;
}
@media (min-width: 1024px) { .app-stats { display: none; } }

.stat {
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid var(--na-color-glass-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat--mins {
  background: rgba(91, 91, 255, 0.12);
  border-color: rgba(91, 91, 255, 0.28);
}
.stat--xp {
  background: rgba(122, 63, 228, 0.12);
  border-color: rgba(122, 63, 228, 0.28);
}
.stat--retn {
  background: rgba(110, 139, 255, 0.12);
  border-color: rgba(110, 139, 255, 0.28);
}
[data-theme="light"] .stat--mins {
  background: rgba(61, 91, 217, 0.10);
  border-color: rgba(61, 91, 217, 0.22);
}
[data-theme="light"] .stat--xp {
  background: rgba(108, 50, 204, 0.08);
  border-color: rgba(108, 50, 204, 0.20);
}
[data-theme="light"] .stat--retn {
  background: rgba(110, 139, 255, 0.10);
  border-color: rgba(110, 139, 255, 0.22);
}
.stat__val {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat__val em {
  font-size: 11px;
  font-weight: 600;
  opacity: 0.6;
  font-style: normal;
}
.stat__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}

/* ============================================================
   SECTION HEAD
   ============================================================ */
.app-section {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 28px 0 14px;
}
.app-section__num {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .app-section__num { color: var(--na-color-primary-700); }
.app-section__title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--na-color-on-surface);
}
.app-section__rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--na-color-glass-border), transparent);
}
.app-section__more {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  color: var(--na-color-on-surface-muted);
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--app-tx-fast) var(--app-ease);
}
.app-section__more:hover { color: var(--na-color-on-surface); }

/* ============================================================
   CONTINUE — wide editorial card
   ============================================================ */
.app-continue {
  border-radius: var(--app-radius);
  overflow: hidden;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  display: grid;
  grid-template-columns: 110px 1fr;
  transition: transform var(--app-tx) var(--app-ease),
              box-shadow var(--app-tx) var(--app-ease);
  cursor: pointer;
}
@media (min-width: 1024px) {
  .app-continue { grid-template-columns: 200px 1fr auto; }
}
.app-continue:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -12px rgba(0,0,0,0.40);
}
[data-theme="light"] .app-continue {
  background: var(--na-color-neutral-0);
  border-color: rgba(15, 23, 42, 0.06);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}
[data-theme="light"] .app-continue:hover {
  box-shadow: 0 18px 40px -12px rgba(15, 23, 42, 0.18);
}

.app-continue__visual {
  position: relative;
  background: linear-gradient(135deg, #3D5BD9, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  min-height: 110px;
}
.app-continue__visual::after {
  content: "";
  position: absolute;
  right: -1px; top: 0; height: 100%; width: 24px;
  background: var(--na-color-surface-raised);
  clip-path: polygon(100% 0, 0 50%, 100% 100%);
}
[data-theme="light"] .app-continue__visual::after { background: var(--na-color-neutral-0); }
.app-continue__visual svg { width: 60px; height: 60px; }
@media (min-width: 1024px) {
  .app-continue__visual svg { width: 80px; height: 80px; }
}

.app-continue__body {
  padding: 14px 16px;
  display: flex; flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.app-continue__eyebrow {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--na-color-primary-300);
  text-transform: uppercase;
  font-weight: 700;
}
[data-theme="light"] .app-continue__eyebrow { color: var(--na-color-primary-700); }
.app-continue__title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
@media (min-width: 1024px) {
  .app-continue__title { font-size: 17px; }
}
.app-continue__progress {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.app-continue__steps {
  display: flex;
  gap: 3px;
  flex: 1;
}
.app-continue__steps span {
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--na-color-glass-border);
}
.app-continue__steps span.is-on {
  background: linear-gradient(90deg, #5B5BFF, #7A3FE4);
}
.app-continue__steps span.is-half {
  background: linear-gradient(90deg, #5B5BFF 50%, var(--na-color-glass-border) 50%);
}
.app-continue__pct {
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface);
}
.app-continue__cta {
  display: none;
  align-self: center;
  margin-right: 18px;
  padding: 10px 18px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: var(--na-color-neutral-0);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: transform var(--app-tx-fast) var(--app-ease),
              box-shadow var(--app-tx-fast) var(--app-ease);
}
.app-continue__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(91, 91, 255, 0.45);
}
.app-continue__cta svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
@media (min-width: 1024px) { .app-continue__cta { display: inline-flex; } }

/* ============================================================
   NEURO INSTRUMENT
   ============================================================ */
.instrument {
  border-radius: var(--app-radius-lg);
  overflow: hidden;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122, 63, 228, 0.22), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91, 91, 255, 0.22), transparent 60%),
    var(--na-color-neutral-900);
  border: 1px solid rgba(143, 168, 255, 0.20);
  color: var(--na-color-neutral-0);
  padding: 18px;
}
[data-theme="light"] .instrument {
  background:
    radial-gradient(ellipse at 100% 0%, rgba(108, 50, 204, 0.10), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(61, 91, 217, 0.10), transparent 60%),
    #131726;
  color: #F2F4F8;
}
.instrument__head {
  display: flex; align-items: center; gap: 10px;
}
.instrument__chip {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.18);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-transform: uppercase;
}
.instrument__chip-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #2EC27E;
  box-shadow: 0 0 6px #2EC27E;
  animation: live-pulse 1.6s ease-in-out infinite;
}
@keyframes live-pulse {
  0%, 100% { opacity: 0.5; }
  50%      { opacity: 1; }
}
.instrument__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.instrument__sub {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  opacity: 0.55;
  text-transform: uppercase;
}
.instrument__wave {
  height: 90px;
  margin: 14px -18px 10px;
  position: relative;
  overflow: hidden;
}
.instrument__wave svg {
  width: 200%;
  height: 100%;
  position: absolute;
  left: 0;
  animation: wave-scroll 9s linear infinite;
}
@keyframes wave-scroll {
  to { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .instrument__wave svg { animation: none; }
}
.instrument__readouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px dashed rgba(255, 255, 255, 0.14);
  padding-top: 14px;
}
.instrument__cell {
  padding-inline: 10px;
  position: relative;
}
.instrument__cell:first-child { padding-left: 0; }
.instrument__cell:last-child  { padding-right: 0; }
.instrument__cell + .instrument__cell::before {
  content: "";
  position: absolute;
  left: 0; top: 0; height: 100%; width: 1px;
  background-image: linear-gradient(to bottom, transparent, rgba(255,255,255,0.18), transparent);
}
.instrument__readout-label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 4px;
}
.instrument__readout-val {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.instrument__readout-val em {
  font-size: 12px;
  font-weight: 600;
  opacity: 0.55;
  font-style: normal;
}
.instrument__readout-trend {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  margin-top: 4px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}
.instrument__readout-trend--up   { color: #2EC27E; }
.instrument__readout-trend--down { color: #F25E62; }
.instrument__readout-trend--flat { color: rgba(255,255,255,0.55); }

/* ============================================================
   2-COLUMN ROW (desktop): instrument + domain map
   ============================================================ */
.app-row-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
@media (min-width: 1024px) {
  .app-row-2 { grid-template-columns: 1fr 1fr; }
}

/* ============================================================
   DOMAIN MAP — neural graph
   ============================================================ */
.domain-map {
  height: 260px;
  border-radius: var(--app-radius-lg);
  border: 1px solid var(--na-color-glass-border);
  background: radial-gradient(circle at 50% 50%, rgba(91, 91, 255, 0.08), transparent 60%);
  position: relative;
  overflow: hidden;
}
.domain-map__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(143, 168, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 168, 255, 0.07) 1px, transparent 1px);
  background-size: 24px 24px;
}
[data-theme="light"] .domain-map__grid {
  background-image:
    linear-gradient(rgba(61, 91, 217, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 91, 217, 0.08) 1px, transparent 1px);
}
.domain-map__edges {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}

.domain-map__node {
  position: absolute;
  display: flex; flex-direction: column;
  align-items: center; gap: 6px;
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition: transform var(--app-tx) var(--app-ease-spring);
  background: transparent;
  border: none;
  padding: 0;
}
.domain-map__node:hover { transform: translate(-50%, -50%) scale(1.06); }
.domain-map__node:active { transform: translate(-50%, -50%) scale(0.94); }

.domain-map__shape {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  font-size: 18px;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-surface-raised);
  position: relative;
  transition: all var(--app-tx) var(--app-ease);
}
.domain-map__shape--diamond {
  transform: rotate(45deg);
  border-radius: 4px;
}
.domain-map__shape--diamond > * { transform: rotate(-45deg); }
.domain-map__shape--hex {
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  border: none;
}
.domain-map__shape--circle {
  border-radius: 50%;
}
[data-theme="light"] .domain-map__shape { background: var(--na-color-neutral-0); }

.domain-map__node[data-active="true"] .domain-map__shape {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  border-color: transparent;
  box-shadow: 0 0 0 4px rgba(91, 91, 255, 0.22),
              0 8px 24px rgba(91, 91, 255, 0.45);
}

.domain-map__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.domain-map__node[data-active="true"] .domain-map__label {
  color: var(--na-color-on-surface);
}

/* ============================================================
   RECOMMENDED — horizontal grid
   ============================================================ */
.app-rec {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 240px;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
  margin-inline: -16px;
  padding-inline: 16px;
}
@media (min-width: 768px) {
  .app-rec {
    margin-inline: 0;
    padding-inline: 0;
  }
}
@media (min-width: 1024px) {
  .app-rec {
    grid-auto-flow: row;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-columns: auto;
    overflow: visible;
  }
}
.app-rec::-webkit-scrollbar { display: none; }

.rec-card {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  scroll-snap-align: start;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform var(--app-tx) var(--app-ease),
              box-shadow var(--app-tx) var(--app-ease),
              border-color var(--app-tx) var(--app-ease);
}
.rec-card:hover {
  transform: translateY(-3px);
  border-color: rgba(143, 168, 255, 0.30);
  box-shadow: 0 18px 40px -12px rgba(91, 91, 255, 0.20);
}
[data-theme="light"] .rec-card {
  background: var(--na-color-neutral-0);
  border-color: rgba(15, 23, 42, 0.06);
}
[data-theme="light"] .rec-card:hover {
  box-shadow: 0 18px 40px -12px rgba(15, 23, 42, 0.14);
}

.rec-card__cover {
  height: 120px;
  position: relative;
  overflow: hidden;
}
.rec-card__cover svg {
  width: 100%; height: 100%;
  transition: transform var(--app-tx-slow) var(--app-ease);
}
.rec-card:hover .rec-card__cover svg { transform: scale(1.06); }
.rec-card__diff {
  position: absolute;
  top: 10px; right: 10px;
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  text-transform: uppercase;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.rec-card__body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.rec-card__cat {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--na-color-primary-300);
  text-transform: uppercase;
  font-weight: 700;
}
[data-theme="light"] .rec-card__cat { color: var(--na-color-primary-700); }
.rec-card__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--na-color-on-surface);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.rec-card__foot {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  font-variant-numeric: tabular-nums;
}
.rec-card__foot svg {
  width: 12px; height: 12px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.rec-card__rating {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 3px;
  color: #F0B73A;
  font-weight: 700;
}
.rec-card__rating svg { fill: currentColor; stroke: none; width: 11px; height: 11px; }

/* ============================================================
   RIGHT RAIL (desktop only)
   ============================================================ */
.app-rail {
  display: none;
}
@media (min-width: 1280px) {
  .app-rail {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 32px 24px 32px 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    scrollbar-width: none;
  }
  .app-rail::-webkit-scrollbar { display: none; }
}

.rail-card {
  border-radius: var(--app-radius);
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-surface-raised);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
[data-theme="light"] .rail-card {
  background: var(--na-color-neutral-0);
  border-color: rgba(15, 23, 42, 0.06);
}
.rail-card__head {
  display: flex;
  align-items: center;
  gap: 8px;
}
.rail-card__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.rail-card__sub {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}

/* upcoming list */
.rail-event {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  border-top: 1px dashed var(--na-color-glass-border);
}
.rail-event:first-of-type { border-top: 0; padding-top: 0; }
.rail-event__date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 6px;
  background: var(--na-color-glass-tint);
}
.rail-event__day {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.rail-event__mon {
  font-family: var(--na-font-mono);
  font-size: 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 3px;
  opacity: 0.7;
}
.rail-event__name {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 3px;
}
.rail-event__time {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  font-variant-numeric: tabular-nums;
}

/* mentor */
.rail-mentor {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}
.rail-mentor__avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: var(--na-color-neutral-0);
  font-size: 11px; font-weight: 700;
  flex-shrink: 0;
}
.rail-mentor__info { flex: 1; min-width: 0; }
.rail-mentor__name {
  font-size: 12px; font-weight: 700; letter-spacing: -0.01em;
}
.rail-mentor__role {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.rail-mentor__btn {
  width: 32px; height: 32px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
  cursor: pointer;
  color: var(--na-color-on-surface);
  transition: all var(--app-tx-fast) var(--app-ease);
}
.rail-mentor__btn:hover {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  border-color: transparent;
}
.rail-mentor__btn svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}

/* recall */
.rail-recall__bar {
  display: flex;
  gap: 4px;
  height: 36px;
  align-items: flex-end;
}
.rail-recall__bar span {
  flex: 1;
  background: linear-gradient(to top, #5B5BFF, #7A3FE4);
  border-radius: 2px;
  opacity: 0.65;
  transition: opacity var(--app-tx-fast) var(--app-ease);
}
.rail-recall__bar span:hover { opacity: 1; }
.rail-recall__legend {
  display: flex;
  justify-content: space-between;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}

/* ============================================================
   MOBILE TAB BAR (shown < 768px)
   ============================================================ */
.app-tabbar {
  position: fixed;
  left: 12px; right: 12px;
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 50;
  height: 64px;
  border-radius: 22px;
  background: rgba(11, 15, 26, 0.86);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  backdrop-filter: blur(28px) saturate(180%);
  border: 1px solid rgba(143, 168, 255, 0.16);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  box-shadow:
    0 18px 40px -12px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}
[data-theme="light"] .app-tabbar {
  background: rgba(255, 255, 255, 0.86);
  border-color: rgba(15, 23, 42, 0.08);
  box-shadow:
    0 18px 40px -12px rgba(15, 23, 42, 0.20),
    0 0 0 1px rgba(255, 255, 255, 0.6) inset;
}
@media (min-width: 768px) { .app-tabbar { display: none; } }

.app-tab {
  display: flex; flex-direction: column;
  align-items: center; gap: 2px;
  padding: 4px 10px;
  color: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  position: relative;
  text-decoration: none;
  transition: color var(--app-tx-fast) var(--app-ease);
}
[data-theme="light"] .app-tab { color: var(--na-color-on-surface-muted); }
.app-tab svg {
  width: 22px; height: 22px;
  stroke: currentColor; fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.app-tab__lbl {
  font-family: var(--na-font-mono);
  font-size: 8px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 700;
}
.app-tab[aria-current="page"] { color: #FFFFFF; }
[data-theme="light"] .app-tab[aria-current="page"] { color: var(--na-color-primary-700); }
.app-tab[aria-current="page"]::before {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}
.app-action {
  width: 52px; height: 52px;
  margin-top: -22px;
  border-radius: 18px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
  cursor: pointer;
  border: none;
  position: relative;
  box-shadow:
    0 10px 30px rgba(91, 91, 255, 0.5),
    0 0 0 4px rgba(91, 91, 255, 0.18);
  transition: transform var(--app-tx-fast) var(--app-ease-spring);
}
.app-action:hover { transform: scale(1.06); }
.app-action:active { transform: scale(0.95); }
.app-action::before {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 22px;
  border: 1px solid rgba(91, 91, 255, 0.4);
  animation: action-ping 2.4s ease-out infinite;
}
@keyframes action-ping {
  0% { transform: scale(1); opacity: 0.7; }
  100% { transform: scale(1.30); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .app-action::before { animation: none; }
}
.app-action svg {
  width: 22px; height: 22px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

/* ============================================================
   FADE-IN ON MOUNT
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(8px);
  animation: fade-up 600ms var(--app-ease) forwards;
}
.fade-up:nth-child(1) { animation-delay: 40ms; }
.fade-up:nth-child(2) { animation-delay: 100ms; }
.fade-up:nth-child(3) { animation-delay: 160ms; }
.fade-up:nth-child(4) { animation-delay: 220ms; }
.fade-up:nth-child(5) { animation-delay: 280ms; }
.fade-up:nth-child(6) { animation-delay: 340ms; }
.fade-up:nth-child(7) { animation-delay: 400ms; }

@keyframes fade-up {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .fade-up { opacity: 1; transform: none; animation: none; }
}


/* ============================================================
   PAGE-SPECIFIC ADDITIONS
   ============================================================ */

/* Topbar date pill */
.app-topbar__date {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.app-topbar__date-mark {
  width: 6px; height: 6px; border-radius: 50%;
  background: #2EC27E;
  box-shadow: 0 0 8px #2EC27E;
  animation: live-pulse 1.6s ease-in-out infinite;
}

/* Page header */
.page-head {
  margin-bottom: 24px;
}
.page-head__eyebrow {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .page-head__eyebrow { color: var(--na-color-primary-700); }

.page-head__title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 6px 0 8px;
  color: var(--na-color-on-surface);
}
@media (max-width: 767px) { .page-head__title { font-size: 24px; } }

.page-head__lede {
  font-size: 14px;
  color: var(--na-color-on-surface-muted);
  max-width: 64ch;
  line-height: 1.55;
}

/* Filter row */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.chip {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--na-color-on-surface-muted);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--na-font-sans);
}
.chip:hover {
  border-color: rgba(143, 168, 255, 0.30);
  color: var(--na-color-on-surface);
}
.chip[aria-selected="true"] {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: var(--na-color-neutral-0);
  border-color: transparent;
}

/* Generic grid */
.grid-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 600px) { .grid-cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid-cards { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1440px) { .grid-cards { grid-template-columns: repeat(4, 1fr); } }


/* ============================================================
   COURSE CARD (used in explore, courses, bookmarks)
   ============================================================ */
.course-card {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  overflow: hidden;
  display: flex; flex-direction: column;
  cursor: pointer;
  transition: transform var(--app-tx) var(--app-ease),
              box-shadow var(--app-tx) var(--app-ease),
              border-color var(--app-tx) var(--app-ease);
}
.course-card:hover {
  transform: translateY(-3px);
  border-color: rgba(143, 168, 255, 0.30);
  box-shadow: 0 18px 40px -12px rgba(91, 91, 255, 0.20);
}
[data-theme="light"] .course-card {
  background: var(--na-color-neutral-0);
  border-color: rgba(15, 23, 42, 0.06);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}
[data-theme="light"] .course-card:hover {
  box-shadow: 0 18px 40px -12px rgba(15, 23, 42, 0.14);
}

.course-card__cover {
  height: 120px;
  position: relative;
  overflow: hidden;
}
.course-card__cover svg {
  width: 100%; height: 100%;
  transition: transform var(--app-tx-slow) var(--app-ease);
}
.course-card:hover .course-card__cover svg { transform: scale(1.06); }

.course-card__diff {
  position: absolute;
  top: 10px; right: 10px;
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  text-transform: uppercase;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.course-card__bookmark {
  position: absolute;
  top: 10px; left: 10px;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.45);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: none;
  display: grid; place-items: center;
  cursor: pointer;
  color: #fff;
}
.course-card__bookmark svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.course-card__bookmark[aria-pressed="true"] svg { fill: currentColor; }

.course-card__body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.course-card__cat {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--na-color-primary-300);
  text-transform: uppercase;
  font-weight: 700;
}
[data-theme="light"] .course-card__cat { color: var(--na-color-primary-700); }
.course-card__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--na-color-on-surface);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-card__desc {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-card__progress {
  margin-top: 4px;
  display: flex; align-items: center; gap: 8px;
}
.course-card__bar {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: var(--na-color-glass-border);
  overflow: hidden;
}
.course-card__fill {
  display: block; height: 100%;
  background: linear-gradient(90deg, #5B5BFF, #7A3FE4);
}
.course-card__pct {
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface);
}
.course-card__foot {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  font-variant-numeric: tabular-nums;
}
.course-card__foot svg {
  width: 12px; height: 12px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.course-card__rating {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 3px;
  color: #F0B73A;
  font-weight: 700;
}
.course-card__rating svg { fill: currentColor; stroke: none; width: 11px; height: 11px; }


/* ============================================================
   ENCYCLOPEDIA — alpha browser + entry list
   ============================================================ */
.alpha-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 20px;
}
.alpha-bar__btn {
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 1px solid var(--na-color-glass-border);
  background: transparent;
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--na-color-on-surface-muted);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.alpha-bar__btn:hover, .alpha-bar__btn[aria-selected="true"] {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  border-color: transparent;
}

.entry-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 768px) { .entry-list { grid-template-columns: repeat(2, 1fr); } }

.entry {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  transition: all var(--app-tx) var(--app-ease);
}
.entry:hover {
  border-color: rgba(143, 168, 255, 0.30);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -12px rgba(91, 91, 255, 0.22);
}
[data-theme="light"] .entry { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }

.entry__letter {
  width: 44px; height: 44px;
  flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.20), rgba(122, 63, 228, 0.15));
  border: 1px solid rgba(143, 168, 255, 0.25);
  font-family: var(--na-font-sans);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--na-color-on-surface);
}
.entry__body { flex: 1; min-width: 0; }
.entry__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
  color: var(--na-color-on-surface);
}
.entry__desc {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}
.entry__tags {
  display: flex; gap: 6px; flex-wrap: wrap;
}
.entry__tag {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 3px 7px;
  border-radius: 4px;
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface-muted);
}


/* ============================================================
   LAB AIOT — instrument tiles
   ============================================================ */
.lab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 768px) { .lab-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1280px) { .lab-grid { grid-template-columns: repeat(3, 1fr); } }

.lab-tile {
  border-radius: var(--app-radius);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122, 63, 228, 0.16), transparent 60%),
    var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 18px;
  cursor: pointer;
  transition: all var(--app-tx) var(--app-ease);
  position: relative;
  overflow: hidden;
}
.lab-tile:hover {
  transform: translateY(-3px);
  border-color: rgba(143, 168, 255, 0.35);
  box-shadow: 0 18px 40px -12px rgba(91, 91, 255, 0.25);
}
[data-theme="light"] .lab-tile { background: var(--na-color-neutral-0); }

.lab-tile__head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px;
}
.lab-tile__icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
}
.lab-tile__icon svg {
  width: 22px; height: 22px;
  stroke: currentColor; fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.lab-tile__chip {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--na-color-glass-border);
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.lab-tile__chip--live {
  color: #2EC27E;
  border-color: rgba(46, 194, 126, 0.35);
}
.lab-tile__title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  color: var(--na-color-on-surface);
}
.lab-tile__desc {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}
.lab-tile__readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 12px;
  border-radius: 10px;
  background: var(--na-color-surface);
  border: 1px solid var(--na-color-glass-border);
  margin-bottom: 12px;
}
[data-theme="light"] .lab-tile__readout { background: #F4F5FA; }
.lab-tile__readout-cell {
  font-family: var(--na-font-mono);
}
.lab-tile__readout-label {
  font-size: 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 2px;
}
.lab-tile__readout-val {
  font-size: 14px;
  font-weight: 700;
  color: var(--na-color-on-surface);
  font-variant-numeric: tabular-nums;
}
.lab-tile__foot {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
}
.lab-tile__cta {
  margin-left: auto;
  padding: 6px 12px;
  border-radius: 8px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-family: var(--na-font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
}


/* ============================================================
   ANALYTICS — heatmap, big chart
   ============================================================ */
.analytics-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
@media (min-width: 1024px) { .analytics-row { grid-template-columns: repeat(4, 1fr); } }

.kpi {
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 16px;
}
[data-theme="light"] .kpi { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.kpi__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 8px;
}
.kpi__val {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface);
}
.kpi__val em {
  font-size: 13px;
  font-weight: 600;
  opacity: 0.55;
  font-style: normal;
  letter-spacing: 0;
}
.kpi__trend {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  margin-top: 6px;
  font-weight: 600;
}
.kpi__trend--up   { color: #2EC27E; }
.kpi__trend--down { color: #F25E62; }

/* heatmap */
.heatmap {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 18px;
  overflow-x: auto;
}
[data-theme="light"] .heatmap { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.heatmap__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
  color: var(--na-color-on-surface);
}
.heatmap__sub {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 16px;
}
.heatmap__grid {
  display: grid;
  grid-template-columns: repeat(20, 14px);
  gap: 4px;
  margin-bottom: 12px;
  min-width: 360px;
}
.heatmap__cell {
  width: 14px; height: 14px;
  border-radius: 3px;
  background: var(--na-color-glass-border);
}
.heatmap__cell[data-level="1"] { background: rgba(91, 91, 255, 0.20); }
.heatmap__cell[data-level="2"] { background: rgba(91, 91, 255, 0.45); }
.heatmap__cell[data-level="3"] { background: rgba(91, 91, 255, 0.70); }
.heatmap__cell[data-level="4"] { background: linear-gradient(135deg, #5B5BFF, #7A3FE4); }

.heatmap__legend {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  color: var(--na-color-on-surface-muted);
  text-transform: uppercase;
}
.heatmap__legend-dots {
  display: flex; gap: 4px;
}
.heatmap__legend-dots span {
  width: 12px; height: 12px;
  border-radius: 3px;
  background: var(--na-color-glass-border);
}
.heatmap__legend-dots span:nth-child(2) { background: rgba(91, 91, 255, 0.20); }
.heatmap__legend-dots span:nth-child(3) { background: rgba(91, 91, 255, 0.45); }
.heatmap__legend-dots span:nth-child(4) { background: rgba(91, 91, 255, 0.70); }
.heatmap__legend-dots span:nth-child(5) { background: linear-gradient(135deg, #5B5BFF, #7A3FE4); }


/* ============================================================
   FORUM
   ============================================================ */
.thread-list { display: flex; flex-direction: column; gap: 10px; }
.thread {
  padding: 16px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 14px;
  align-items: center;
  cursor: pointer;
  transition: all var(--app-tx) var(--app-ease);
}
.thread:hover {
  border-color: rgba(143, 168, 255, 0.30);
  transform: translateY(-1px);
}
[data-theme="light"] .thread { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }

.thread__avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
  font-size: 12px; font-weight: 700;
}
.thread__body { min-width: 0; }
.thread__meta {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 4px;
}
.thread__meta b { color: var(--na-color-primary-300); font-weight: 700; }
[data-theme="light"] .thread__meta b { color: var(--na-color-primary-700); }
.thread__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--na-color-on-surface);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.thread__excerpt {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.thread__stats {
  display: flex; flex-direction: column; align-items: flex-end;
  gap: 4px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface-muted);
}
.thread__stat {
  display: inline-flex; align-items: center; gap: 4px;
}
.thread__stat svg {
  width: 12px; height: 12px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}

/* ============================================================
   MENTOR
   ============================================================ */
.mentor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 768px) { .mentor-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1280px) { .mentor-grid { grid-template-columns: repeat(3, 1fr); } }

.mentor {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 20px;
  text-align: center;
  transition: all var(--app-tx) var(--app-ease);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.mentor:hover {
  border-color: rgba(143, 168, 255, 0.35);
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -12px rgba(91, 91, 255, 0.20);
}
[data-theme="light"] .mentor { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }

.mentor__avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
  font-size: 24px;
  font-weight: 800;
  position: relative;
  border: 3px solid var(--na-color-surface-raised);
  box-shadow: 0 0 0 2px rgba(143, 168, 255, 0.25);
}
[data-theme="light"] .mentor__avatar { border-color: var(--na-color-neutral-0); }
.mentor__status {
  position: absolute;
  bottom: 4px; right: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #2EC27E;
  border: 3px solid var(--na-color-surface-raised);
}
[data-theme="light"] .mentor__status { border-color: var(--na-color-neutral-0); }

.mentor__name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--na-color-on-surface);
  margin-bottom: 4px;
}
.mentor__role {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  margin-bottom: 12px;
  font-weight: 700;
}
[data-theme="light"] .mentor__role { color: var(--na-color-primary-700); }
.mentor__bio {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}
.mentor__stats {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 14px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
}
.mentor__stats b {
  font-size: 12px;
  color: var(--na-color-on-surface);
  font-weight: 800;
}
.mentor__cta {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
}


/* ============================================================
   PROFILE
   ============================================================ */
.profile-hero {
  border-radius: var(--app-radius-lg);
  padding: 24px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122, 63, 228, 0.30), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91, 91, 255, 0.30), transparent 60%),
    var(--na-color-surface-raised);
  border: 1px solid rgba(143, 168, 255, 0.25);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 20px;
}
@media (min-width: 768px) {
  .profile-hero {
    flex-direction: row;
    align-items: center;
    text-align: left;
    gap: 28px;
  }
}
[data-theme="light"] .profile-hero { background:
  radial-gradient(ellipse at 100% 0%, rgba(108, 50, 204, 0.10), transparent 60%),
  radial-gradient(ellipse at 0% 100%, rgba(61, 91, 217, 0.10), transparent 60%),
  var(--na-color-neutral-0); }

.profile-hero__avatar {
  width: 96px; height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.04em;
  flex-shrink: 0;
  margin-bottom: 16px;
}
@media (min-width: 768px) { .profile-hero__avatar { margin-bottom: 0; } }

.profile-hero__name {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--na-color-on-surface);
}
.profile-hero__role {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  margin: 4px 0 12px;
  font-weight: 700;
}
[data-theme="light"] .profile-hero__role { color: var(--na-color-primary-700); }
.profile-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
@media (min-width: 768px) { .profile-hero__stats { justify-content: flex-start; } }
.profile-hero__stat {
  display: flex; flex-direction: column;
}
.profile-hero__stat-val {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--na-color-on-surface);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.profile-hero__stat-lbl {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 4px;
}
.profile-hero__edit {
  margin-left: auto;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  display: none;
}
@media (min-width: 768px) { .profile-hero__edit { display: inline-block; } }

/* badges grid */
.badges {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
@media (min-width: 600px) { .badges { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .badges { grid-template-columns: repeat(6, 1fr); } }

.badge-item {
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 12px;
  text-align: center;
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.badge-item:hover { transform: translateY(-2px); border-color: rgba(143, 168, 255, 0.30); }
[data-theme="light"] .badge-item { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.badge-item--locked { opacity: 0.4; }
.badge-item__icon {
  width: 48px; height: 48px;
  margin: 0 auto 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.20), rgba(122, 63, 228, 0.18));
  display: grid; place-items: center;
  font-size: 22px;
}
.badge-item__name {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--na-color-on-surface);
}
.badge-item__date {
  font-family: var(--na-font-mono);
  font-size: 8px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 2px;
}

/* settings list */
.settings-list { display: flex; flex-direction: column; gap: 4px; }
.setting {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.setting:hover { border-color: rgba(143, 168, 255, 0.30); }
[data-theme="light"] .setting { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.setting__icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
  color: var(--na-color-primary-300);
  flex-shrink: 0;
}
.setting__icon svg {
  width: 18px; height: 18px;
  stroke: currentColor; fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.setting__body { flex: 1; min-width: 0; }
.setting__title { font-size: 13px; font-weight: 700; letter-spacing: -0.01em; color: var(--na-color-on-surface); margin-bottom: 2px; }
.setting__sub { font-size: 11px; color: var(--na-color-on-surface-muted); }
.setting__caret { color: var(--na-color-on-surface-muted); flex-shrink: 0; }
.setting__caret svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}


/* ============================================================
   COURSE / LESSON DETAIL
   ============================================================ */
.detail-hero {
  border-radius: var(--app-radius-lg);
  overflow: hidden;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122,63,228,0.30), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91,91,255,0.30), transparent 60%),
    var(--na-color-surface-raised);
  border: 1px solid rgba(143, 168, 255, 0.20);
  padding: 24px;
  margin-bottom: 24px;
}
[data-theme="light"] .detail-hero { background:
  radial-gradient(ellipse at 100% 0%, rgba(108,50,204,0.10), transparent 60%),
  radial-gradient(ellipse at 0% 100%, rgba(61,91,217,0.10), transparent 60%),
  var(--na-color-neutral-0); }

.detail-hero__eyebrow {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .detail-hero__eyebrow { color: var(--na-color-primary-700); }
.detail-hero__title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 8px 0 12px;
  color: var(--na-color-on-surface);
}
@media (min-width: 1024px) { .detail-hero__title { font-size: 36px; } }
.detail-hero__lede {
  font-size: 14px;
  line-height: 1.6;
  color: var(--na-color-on-surface-muted);
  max-width: 64ch;
  margin-bottom: 20px;
}
.detail-hero__meta {
  display: flex; flex-wrap: wrap;
  gap: 16px;
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--na-color-on-surface-muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 20px;
}
.detail-hero__meta b { color: var(--na-color-on-surface); font-weight: 700; }
.detail-hero__cta {
  padding: 12px 22px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-size: 13px; font-weight: 700;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  text-decoration: none;
}
.detail-hero__cta--ghost {
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
}

/* Module list */
.module-list { display: flex; flex-direction: column; gap: 8px; }
.module {
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  overflow: hidden;
}
[data-theme="light"] .module { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }

.module__head {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 14px; align-items: center;
  padding: 14px 16px;
  cursor: pointer;
}
.module__num {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
  font-family: var(--na-font-mono);
  font-size: 12px; font-weight: 800;
  color: var(--na-color-on-surface);
  font-variant-numeric: tabular-nums;
}
.module--done .module__num {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff; border-color: transparent;
}
.module__title { font-size: 14px; font-weight: 700; letter-spacing: -0.01em; color: var(--na-color-on-surface); margin-bottom: 2px; }
.module__sub { font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.10em; text-transform: uppercase; color: var(--na-color-on-surface-muted); }
.module__time {
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface-muted);
}
.module__lessons {
  border-top: 1px solid var(--na-color-glass-border);
  padding: 8px 16px 12px;
}
.module-lesson {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  text-decoration: none;
  color: inherit;
  font-size: 13px;
}
.module-lesson__icon {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
}
.module-lesson__icon svg { width: 12px; height: 12px; stroke: currentColor; fill: none; stroke-width: 2; }
.module-lesson--done .module-lesson__icon { background: linear-gradient(135deg, #5B5BFF, #7A3FE4); border-color: transparent; color: #fff; }
.module-lesson--current .module-lesson__icon { background: rgba(91,91,255,0.18); border-color: rgba(143,168,255,0.40); color: var(--na-color-primary-300); }
[data-theme="light"] .module-lesson--current .module-lesson__icon { color: var(--na-color-primary-700); }
.module-lesson__title { font-weight: 600; letter-spacing: -0.01em; color: var(--na-color-on-surface); }
.module-lesson__title small { font-family: var(--na-font-mono); font-size: 9px; color: var(--na-color-on-surface-muted); margin-left: 6px; letter-spacing: 0.10em; text-transform: uppercase; }
.module-lesson__time { font-family: var(--na-font-mono); font-size: 10px; color: var(--na-color-on-surface-muted); font-variant-numeric: tabular-nums; }


/* ============================================================
   LESSON READER
   ============================================================ */
.reader {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 1024px) { .reader { grid-template-columns: 240px 1fr; } }

.reader-toc {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 16px;
  position: sticky; top: 16px;
  align-self: start;
  display: none;
}
@media (min-width: 1024px) { .reader-toc { display: block; } }
[data-theme="light"] .reader-toc { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.reader-toc__title {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 12px;
}
.reader-toc__link {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  text-decoration: none;
  margin-bottom: 2px;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.reader-toc__link:hover, .reader-toc__link[aria-current="true"] {
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
  font-weight: 600;
}
.reader-toc__link[aria-current="true"] {
  background: linear-gradient(135deg, rgba(91,91,255,0.18), rgba(122,63,228,0.14));
  color: var(--na-color-on-surface);
  box-shadow: inset 0 0 0 1px rgba(143,168,255,0.30);
}

.reader-content {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 28px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--na-color-on-surface);
}
@media (min-width: 1024px) { .reader-content { padding: 40px 48px; } }
[data-theme="light"] .reader-content { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }

.reader-content h2 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 32px 0 12px;
  scroll-margin-top: 16px;
}
.reader-content h2:first-child { margin-top: 0; }
.reader-content h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 24px 0 10px;
}
.reader-content p { margin: 0 0 18px; max-width: 65ch; }
.reader-content figure {
  margin: 24px 0;
  padding: 20px;
  border-radius: 14px;
  background: var(--na-color-surface);
  border: 1px solid var(--na-color-glass-border);
}
[data-theme="light"] .reader-content figure { background: #F4F5FA; }
.reader-content figcaption {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 12px;
}
.reader-content blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  border-left: 3px solid;
  border-image: linear-gradient(180deg, #5B5BFF, #7A3FE4) 1;
  background: rgba(91,91,255,0.06);
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  font-style: italic;
}
.reader-content code {
  font-family: var(--na-font-mono);
  font-size: 13px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
}

.reader-nav {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--na-color-glass-border);
  display: flex;
  gap: 12px;
}
.reader-nav__btn {
  flex: 1;
  padding: 14px 18px;
  border-radius: 12px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  display: flex; flex-direction: column;
  gap: 2px;
}
.reader-nav__btn:hover { border-color: rgba(143,168,255,0.30); }
.reader-nav__btn--next { text-align: right; background: linear-gradient(135deg, rgba(91,91,255,0.20), rgba(122,63,228,0.14)); }
.reader-nav__btn small {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}


/* ============================================================
   QUIZ
   ============================================================ */
.quiz-shell {
  max-width: 720px;
  margin: 0 auto;
}
.quiz-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
}
[data-theme="light"] .quiz-bar { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.quiz-bar__progress { flex: 1; }
.quiz-bar__steps {
  display: flex; gap: 4px;
  margin-bottom: 6px;
}
.quiz-bar__steps span {
  flex: 1; height: 5px;
  border-radius: 999px;
  background: var(--na-color-glass-border);
}
.quiz-bar__steps span.is-on { background: linear-gradient(90deg, #5B5BFF, #7A3FE4); }
.quiz-bar__steps span.is-current {
  background: linear-gradient(90deg, #5B5BFF 50%, var(--na-color-glass-border) 50%);
}
.quiz-bar__label {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.quiz-bar__timer {
  font-family: var(--na-font-mono);
  font-size: 16px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface);
  padding: 8px 14px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  letter-spacing: 0.04em;
}

.quiz-card {
  border-radius: var(--app-radius-lg);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 28px;
  margin-bottom: 16px;
}
[data-theme="light"] .quiz-card { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.quiz-card__num {
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
  margin-bottom: 12px;
}
[data-theme="light"] .quiz-card__num { color: var(--na-color-primary-700); }
.quiz-card__q {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.4;
  color: var(--na-color-on-surface);
  margin-bottom: 24px;
}

.quiz-options {
  display: flex; flex-direction: column;
  gap: 10px;
}
.quiz-option {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border-radius: 12px;
  background: var(--na-color-surface);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  font-size: 14px;
  text-align: left;
  color: var(--na-color-on-surface);
  transition: all var(--app-tx-fast) var(--app-ease);
}
[data-theme="light"] .quiz-option { background: #F4F5FA; }
.quiz-option:hover { border-color: rgba(143, 168, 255, 0.40); }
.quiz-option__key {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
  font-family: var(--na-font-mono);
  font-size: 12px; font-weight: 800;
  color: var(--na-color-on-surface);
}
.quiz-option[aria-selected="true"] {
  background: linear-gradient(135deg, rgba(91,91,255,0.20), rgba(122,63,228,0.16));
  border-color: rgba(143, 168, 255, 0.45);
  box-shadow: inset 0 0 0 1px rgba(143, 168, 255, 0.20);
}
.quiz-option[aria-selected="true"] .quiz-option__key {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff; border-color: transparent;
}

.quiz-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}
.quiz-actions__skip {
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}


/* ============================================================
   WIKI ENTRY DETAIL
   ============================================================ */
.wiki-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 1024px) { .wiki-grid { grid-template-columns: 1fr 280px; } }

.wiki-aside {
  display: flex; flex-direction: column;
  gap: 14px;
}
.wiki-related {
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 16px;
}
[data-theme="light"] .wiki-related { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.wiki-related__head {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 12px;
}
.wiki-related__item {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--na-color-on-surface);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
  transition: background var(--app-tx-fast) var(--app-ease);
}
.wiki-related__item:hover { background: var(--na-color-glass-tint); }
.wiki-related__item small {
  display: block;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  font-weight: 500;
  margin-top: 2px;
}

/* ============================================================
   FORUM THREAD DETAIL
   ============================================================ */
.thread-head {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 24px;
  margin-bottom: 16px;
}
[data-theme="light"] .thread-head { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.thread-head__meta {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 8px;
}
.thread-head__meta b { color: var(--na-color-primary-300); font-weight: 700; }
[data-theme="light"] .thread-head__meta b { color: var(--na-color-primary-700); }
.thread-head__title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.3;
  margin-bottom: 14px;
}
.thread-head__body {
  font-size: 14px;
  line-height: 1.6;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 16px;
}
.thread-head__actions {
  display: flex; gap: 8px;
  font-family: var(--na-font-mono);
  font-size: 11px;
  color: var(--na-color-on-surface-muted);
}
.thread-head__action {
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
}
.thread-head__action svg { width: 12px; height: 12px; stroke: currentColor; fill: none; stroke-width: 1.8; }
.thread-head__action--like { color: #F25E62; border-color: rgba(242,94,98,0.40); }

.reply-list { display: flex; flex-direction: column; gap: 12px; }
.reply {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 16px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
}
[data-theme="light"] .reply { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.reply--mentor { border-color: rgba(143, 168, 255, 0.30); background: linear-gradient(135deg, rgba(91,91,255,0.06), transparent); }
.reply__avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
  font-size: 12px; font-weight: 700;
}
.reply__head {
  display: flex; align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.reply__name { color: var(--na-color-on-surface); font-weight: 700; }
.reply__role-mentor {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}
.reply__body { font-size: 13px; line-height: 1.6; color: var(--na-color-on-surface); }

.reply-input {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 12px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
}
[data-theme="light"] .reply-input { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.reply-input__field {
  border: 0;
  background: transparent;
  font-family: var(--na-font-sans);
  font-size: 14px;
  color: var(--na-color-on-surface);
  padding: 8px 10px;
  resize: none;
  outline: none;
}
.reply-input__field::placeholder { color: var(--na-color-on-surface-muted); }
.reply-input__send {
  align-self: flex-end;
  padding: 10px 18px;
  border-radius: 10px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  border: none;
  cursor: pointer;
}


/* ============================================================
   LAB DETAIL — interactive instrument
   ============================================================ */
.lab-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 1024px) { .lab-detail { grid-template-columns: 1.4fr 1fr; } }

.lab-stage {
  border-radius: var(--app-radius-lg);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122,63,228,0.20), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91,91,255,0.20), transparent 60%),
    var(--na-color-neutral-900);
  border: 1px solid rgba(143, 168, 255, 0.20);
  padding: 24px;
  color: var(--na-color-neutral-0);
  min-height: 360px;
  position: relative;
  overflow: hidden;
}
.lab-stage__head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px;
}
.lab-stage__chip {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.18);
  display: inline-flex; align-items: center; gap: 4px;
  text-transform: uppercase;
}
.lab-stage__chip-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #2EC27E;
  box-shadow: 0 0 6px #2EC27E;
  animation: live-pulse 1.6s ease-in-out infinite;
}
.lab-stage__title { font-size: 14px; font-weight: 700; letter-spacing: -0.02em; }
.lab-stage__sub { font-family: var(--na-font-mono); font-size: 10px; opacity: 0.55; letter-spacing: 0.10em; text-transform: uppercase; }

.lab-canvas {
  margin: 16px -24px;
  height: 240px;
  background: rgba(0,0,0,0.30);
  position: relative;
  overflow: hidden;
}
.lab-canvas svg { width: 100%; height: 100%; }
.lab-canvas__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(143,168,255,0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143,168,255,0.10) 1px, transparent 1px);
  background-size: 24px 24px;
}

.lab-controls {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
[data-theme="light"] .lab-controls { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.lab-control { }
.lab-control__head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 8px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.lab-control__head span:first-child { color: var(--na-color-on-surface-muted); }
.lab-control__head span:last-child { color: var(--na-color-on-surface); font-weight: 800; font-variant-numeric: tabular-nums; }
.lab-control input[type=range] {
  width: 100%;
  accent-color: #7A3FE4;
}
.lab-control__toggle {
  display: flex; gap: 6px;
}
.lab-control__btn {
  flex: 1;
  padding: 8px;
  border-radius: 8px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--na-color-on-surface-muted);
  cursor: pointer;
  letter-spacing: 0.04em;
}
.lab-control__btn[aria-pressed="true"] {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff; border-color: transparent;
}

.lab-foot {
  display: flex; gap: 8px;
}
.lab-foot__btn {
  flex: 1;
  padding: 12px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
}
.lab-foot__btn--primary {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff; border-color: transparent;
}


/* ============================================================
   MENTOR BOOKING
   ============================================================ */
.booking-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 1024px) { .booking-grid { grid-template-columns: 1fr 360px; } }

.booking-card {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 24px;
}
[data-theme="light"] .booking-card { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }

.booking-mentor {
  display: flex; align-items: center;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 20px;
  border-bottom: 1px dashed var(--na-color-glass-border);
}
.booking-mentor__avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
  font-size: 22px; font-weight: 800;
  flex-shrink: 0;
}
.booking-mentor__name { font-size: 16px; font-weight: 800; letter-spacing: -0.02em; }
.booking-mentor__role {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
  margin: 4px 0;
}
[data-theme="light"] .booking-mentor__role { color: var(--na-color-primary-700); }

.booking-section { margin-bottom: 24px; }
.booking-section__head {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 10px;
}

.date-list, .slot-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
@media (min-width: 600px) { .slot-list { grid-template-columns: repeat(6, 1fr); } }
.date-btn, .slot-btn {
  padding: 10px 8px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  display: flex; flex-direction: column;
  align-items: center; gap: 2px;
  color: var(--na-color-on-surface);
  transition: all var(--app-tx-fast) var(--app-ease);
}
.date-btn span, .slot-btn span {
  font-family: var(--na-font-mono);
}
.date-btn__day { font-size: 9px; letter-spacing: 0.10em; text-transform: uppercase; color: var(--na-color-on-surface-muted); }
.date-btn__num { font-size: 16px; font-weight: 800; letter-spacing: -0.04em; font-variant-numeric: tabular-nums; }
.slot-btn { padding: 12px; }
.slot-btn span { font-size: 12px; font-weight: 700; font-variant-numeric: tabular-nums; }
.date-btn:hover, .slot-btn:hover { border-color: rgba(143, 168, 255, 0.40); }
.date-btn[aria-pressed="true"], .slot-btn[aria-pressed="true"] {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  border-color: transparent;
  color: #fff;
}
.date-btn[aria-pressed="true"] .date-btn__day { color: rgba(255,255,255,0.85); }
.slot-btn[disabled] { opacity: 0.35; cursor: not-allowed; }

.booking-textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--na-color-surface);
  border: 1px solid var(--na-color-glass-border);
  font-family: var(--na-font-sans);
  font-size: 13px;
  color: var(--na-color-on-surface);
  resize: vertical;
  min-height: 84px;
  outline: none;
}
[data-theme="light"] .booking-textarea { background: #F4F5FA; }
.booking-textarea:focus { border-color: rgba(143, 168, 255, 0.45); }

.booking-summary {
  border-radius: var(--app-radius);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122,63,228,0.20), transparent 60%),
    var(--na-color-surface-raised);
  border: 1px solid rgba(143, 168, 255, 0.25);
  padding: 24px;
  position: sticky;
  top: 16px;
  align-self: start;
}
[data-theme="light"] .booking-summary {
  background: radial-gradient(ellipse at 100% 0%, rgba(108,50,204,0.10), transparent 60%), var(--na-color-neutral-0);
}
.booking-summary__row {
  display: flex; justify-content: space-between;
  padding: 10px 0;
  border-top: 1px dashed var(--na-color-glass-border);
  font-size: 13px;
}
.booking-summary__row:first-of-type { border-top: 0; }
.booking-summary__row b { font-weight: 700; color: var(--na-color-on-surface); }
.booking-summary__row span { color: var(--na-color-on-surface-muted); font-family: var(--na-font-mono); font-size: 12px; }
.booking-summary__cta {
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
}


/* ============================================================
   NOTIFICATIONS
   ============================================================ */
.notif-list { display: flex; flex-direction: column; gap: 8px; }
.notif {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
[data-theme="light"] .notif { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); }
.notif:hover { border-color: rgba(143,168,255,0.30); }
.notif--unread { background: linear-gradient(135deg, rgba(91,91,255,0.08), transparent); border-left: 3px solid #5B5BFF; }
.notif__icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
  color: var(--na-color-primary-300);
}
.notif__icon svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.6; }
.notif__icon--lesson { background: linear-gradient(135deg, rgba(91,91,255,0.20), rgba(122,63,228,0.16)); color: var(--na-color-primary-300); }
.notif__icon--quiz { background: rgba(46,194,126,0.16); color: #2EC27E; border-color: rgba(46,194,126,0.30); }
.notif__icon--mentor { background: rgba(122,63,228,0.18); color: var(--na-color-accent-500); border-color: rgba(122,63,228,0.30); }
.notif__icon--badge { background: rgba(240,183,58,0.18); color: #F0B73A; border-color: rgba(240,183,58,0.35); }
.notif__body { min-width: 0; }
.notif__title { font-size: 13px; font-weight: 700; letter-spacing: -0.01em; color: var(--na-color-on-surface); margin-bottom: 2px; }
.notif__sub { font-size: 12px; color: var(--na-color-on-surface-muted); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.notif__time { font-family: var(--na-font-mono); font-size: 9px; letter-spacing: 0.10em; text-transform: uppercase; color: var(--na-color-on-surface-muted); }

/* ============================================================
   AUTH (signin / signup / onboarding)
   ============================================================ */
.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: var(--na-color-surface);
  position: relative;
  overflow: hidden;
}
[data-theme="light"] .auth-page { background: #F4F5FA; }

.auth-card {
  width: 100%;
  max-width: 440px;
  padding: 36px 28px;
  border-radius: 24px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  position: relative;
  z-index: 2;
  box-shadow: 0 30px 80px -10px rgba(0,0,0,0.40);
}
[data-theme="light"] .auth-card { background: var(--na-color-neutral-0); border-color: rgba(15,23,42,0.06); box-shadow: 0 30px 80px -10px rgba(15,23,42,0.20); }

.auth-brand {
  display: flex; align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  text-decoration: none;
  color: var(--na-color-on-surface);
}
.auth-brand__mark {
  width: 32px; height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff;
}
.auth-brand__mark svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.auth-brand__name {
  font-size: 14px; font-weight: 800;
  letter-spacing: -0.02em;
}
.auth-brand__name span {
  display: block;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 2px;
  font-weight: 500;
}

.auth-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 6px;
}
.auth-sub {
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.auth-field {
  margin-bottom: 14px;
}
.auth-field__label {
  display: block;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 6px;
  font-weight: 700;
}
.auth-field__input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--na-color-surface);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-family: var(--na-font-sans);
  font-size: 14px;
  outline: none;
  transition: border-color var(--app-tx-fast) var(--app-ease);
}
[data-theme="light"] .auth-field__input { background: #F4F5FA; }
.auth-field__input:focus {
  border-color: rgba(143, 168, 255, 0.50);
  box-shadow: 0 0 0 4px rgba(91, 91, 255, 0.12);
}
.auth-field__row {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px;
  margin-bottom: 18px;
}
.auth-field__row a { color: var(--na-color-primary-300); text-decoration: none; font-weight: 600; }
[data-theme="light"] .auth-field__row a { color: var(--na-color-primary-700); }
.auth-field__row label {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--na-color-on-surface-muted);
}

.auth-cta {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  letter-spacing: -0.01em;
}

.auth-divider {
  text-align: center;
  margin: 20px 0;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  position: relative;
}
.auth-divider::before, .auth-divider::after {
  content: "";
  position: absolute;
  top: 50%; width: 30%;
  height: 1px;
  background: var(--na-color-glass-border);
}
.auth-divider::before { left: 0; }
.auth-divider::after { right: 0; }

.auth-oauth {
  display: flex; gap: 8px;
}
.auth-oauth__btn {
  flex: 1;
  padding: 12px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px;
}
.auth-foot {
  text-align: center;
  margin-top: 22px;
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
}
.auth-foot a { color: var(--na-color-primary-300); text-decoration: none; font-weight: 700; }
[data-theme="light"] .auth-foot a { color: var(--na-color-primary-700); }

/* Onboarding */
.onboard {
  text-align: center;
}
.onboard__visual {
  width: 200px; height: 200px;
  margin: 0 auto 28px;
  border-radius: 24px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122,63,228,0.40), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91,91,255,0.40), transparent 60%),
    var(--na-color-surface);
  border: 1px solid rgba(143,168,255,0.25);
  display: grid; place-items: center;
  font-size: 80px;
}
.onboard__dots {
  display: flex; justify-content: center; gap: 6px;
  margin: 24px 0;
}
.onboard__dots span {
  width: 24px; height: 4px;
  border-radius: 999px;
  background: var(--na-color-glass-border);
}
.onboard__dots span.is-active {
  background: linear-gradient(90deg, #5B5BFF, #7A3FE4);
}
.onboard__nav { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; }
.onboard__skip {
  background: transparent;
  border: none;
  color: var(--na-color-on-surface-muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  padding: 8px;
}


/* ============================================================
   AUTH PAGES
   ============================================================ */
.auth-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
  background: var(--na-color-surface);
  position: relative;
  overflow-x: hidden;
}
@media (min-width: 1024px) { .auth-page { grid-template-columns: 1fr 1fr; } }
[data-theme="light"] .auth-page { background: #F4F5FA; }

.auth-brand {
  display: none;
  position: relative;
  padding: 48px;
  background:
    radial-gradient(ellipse at 100% 100%, rgba(122, 63, 228, 0.30), transparent 60%),
    radial-gradient(ellipse at 0% 0%, rgba(91, 91, 255, 0.30), transparent 60%),
    var(--na-color-neutral-900);
  color: #fff;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}
@media (min-width: 1024px) { .auth-brand { display: flex; } }
.auth-brand::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(143, 168, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 168, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at center, black, transparent 80%);
}
.auth-brand__logo {
  display: flex; align-items: center; gap: 12px;
  position: relative;
  text-decoration: none;
  color: inherit;
}
.auth-brand__logo b { font-size: 16px; font-weight: 800; letter-spacing: -0.02em; }
.auth-brand__logo span { font-family: var(--na-font-mono); font-size: 9px; letter-spacing: 0.18em; opacity: 0.55; text-transform: uppercase; display: block; margin-top: 2px; }
.auth-brand__hero { position: relative; }
.auth-brand__hero h1 {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 16px;
  max-width: 14ch;
}
.auth-brand__hero p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  max-width: 36ch;
  line-height: 1.6;
  margin-bottom: 32px;
}
.auth-brand__quotes {
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
}
.auth-brand__quote {
  padding: 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
}
.auth-brand__quote-text { font-size: 13px; line-height: 1.55; margin-bottom: 10px; }
.auth-brand__quote-by {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.auth-form {
  display: flex; flex-direction: column;
  padding: 32px 24px;
  position: relative;
  z-index: 1;
}
@media (min-width: 768px) { .auth-form { padding: 64px; max-width: 540px; margin: 0 auto; width: 100%; } }
@media (min-width: 1024px) { .auth-form { max-width: none; padding: 64px 80px; } }

.auth-form__head { margin-bottom: 32px; }
.auth-form__brand-mobile {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 32px;
  text-decoration: none;
  color: var(--na-color-on-surface);
}
@media (min-width: 1024px) { .auth-form__brand-mobile { display: none; } }
.auth-form__title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--na-color-on-surface);
  margin-bottom: 8px;
}
.auth-form__sub {
  font-size: 14px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.55;
}

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  font-weight: 700;
}
.field__input {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
  font-family: var(--na-font-sans);
  font-size: 14px;
  transition: border-color var(--app-tx-fast) var(--app-ease),
              box-shadow var(--app-tx-fast) var(--app-ease);
}
.field__input:focus {
  outline: none;
  border-color: rgba(143, 168, 255, 0.50);
  box-shadow: 0 0 0 4px rgba(91, 91, 255, 0.12);
}
.field__hint {
  font-size: 11px;
  color: var(--na-color-on-surface-muted);
}
.field__row { display: flex; gap: 12px; }
.field__row > .field { flex: 1; }
.btn-primary {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
  margin-top: 8px;
  transition: transform var(--app-tx-fast) var(--app-ease),
              box-shadow var(--app-tx-fast) var(--app-ease);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 30px rgba(91, 91, 255, 0.45); }
.btn-secondary {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.btn-secondary:hover { border-color: rgba(143, 168, 255, 0.30); }
.btn-secondary svg { width: 18px; height: 18px; }
.divider {
  display: flex; align-items: center; gap: 12px;
  margin: 20px 0;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.divider::before, .divider::after {
  content: ""; flex: 1; height: 1px;
  background: var(--na-color-glass-border);
}
.auth-form__foot {
  margin-top: 24px;
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  text-align: center;
}
.auth-form__foot a {
  color: var(--na-color-primary-300);
  font-weight: 700;
  text-decoration: none;
}
[data-theme="light"] .auth-form__foot a { color: var(--na-color-primary-700); }
.checkbox-row {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  margin: 8px 0 4px;
}
.checkbox-row input { accent-color: #7A3FE4; margin-top: 2px; }
.checkbox-row a { color: var(--na-color-primary-300); }
[data-theme="light"] .checkbox-row a { color: var(--na-color-primary-700); }


/* ============================================================
   ONBOARDING SLIDES
   ============================================================ */
.onb-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--na-color-surface);
  position: relative;
  overflow: hidden;
}
[data-theme="light"] .onb-page { background: #F4F5FA; }

.onb-progress {
  display: flex;
  gap: 6px;
  padding: 24px 24px 0;
  max-width: 540px;
  margin: 0 auto;
  width: 100%;
}
.onb-progress span {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: var(--na-color-glass-border);
  transition: background var(--app-tx) var(--app-ease);
}
.onb-progress span.is-on { background: linear-gradient(90deg, #5B5BFF, #7A3FE4); }

.onb-stage {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 32px 24px;
}

.onb-card {
  max-width: 460px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}
.onb-card__visual {
  width: 100%;
  aspect-ratio: 1;
  max-width: 320px;
  border-radius: 24px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122, 63, 228, 0.30), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91, 91, 255, 0.30), transparent 60%),
    var(--na-color-surface-raised);
  border: 1px solid rgba(143, 168, 255, 0.20);
  display: grid; place-items: center;
  position: relative;
  overflow: hidden;
}
.onb-card__visual svg { width: 70%; height: 70%; }
.onb-card__eyebrow {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .onb-card__eyebrow { color: var(--na-color-primary-700); }
.onb-card__title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--na-color-on-surface);
}
.onb-card__lede {
  font-size: 14px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.6;
  max-width: 32ch;
}

.onb-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  max-width: 540px;
  margin: 0 auto;
  width: 100%;
}
.onb-foot__skip {
  background: transparent;
  border: none;
  color: var(--na-color-on-surface-muted);
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 700;
  cursor: pointer;
}
.onb-foot__next {
  padding: 12px 24px;
  border-radius: 12px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  border: none;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.onb-foot__next svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}


/* ============================================================
   COURSE DETAIL
   ============================================================ */
.course-hero {
  border-radius: var(--app-radius-lg);
  overflow: hidden;
  position: relative;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #5B5BFF 0%, #7A3FE4 100%);
  color: #fff;
  padding: 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}
@media (min-width: 768px) { .course-hero { grid-template-columns: 1fr auto; padding: 36px; } }
.course-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: repeating-linear-gradient(-45deg, transparent 0 12px, rgba(255,255,255,0.04) 12px 14px);
  pointer-events: none;
}
.course-hero > * { position: relative; }
.course-hero__cat {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  opacity: 0.85;
}
.course-hero__title {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin: 8px 0 12px;
}
.course-hero__lede {
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.85;
  max-width: 56ch;
  margin-bottom: 16px;
}
.course-hero__meta {
  display: flex; flex-wrap: wrap; gap: 16px;
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.course-hero__meta b { font-size: 14px; font-weight: 800; letter-spacing: -0.02em; }
.course-hero__cta {
  padding: 14px 28px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  color: #1F2436;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.course-hero__cta svg {
  width: 16px; height: 16px; fill: currentColor;
}

.course-detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 1024px) { .course-detail-grid { grid-template-columns: 2fr 1fr; } }

.module-list { display: flex; flex-direction: column; gap: 10px; }
.module {
  border: 1px solid var(--na-color-glass-border);
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  overflow: hidden;
}
[data-theme="light"] .module { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.module__head {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px;
  cursor: pointer;
  user-select: none;
}
.module__num {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.20), rgba(122, 63, 228, 0.16));
  display: grid; place-items: center;
  font-family: var(--na-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--na-color-on-surface);
}
.module__title { flex: 1; min-width: 0; }
.module__name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.module__meta {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 2px;
}
.module__caret {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  color: var(--na-color-on-surface-muted);
  transition: transform var(--app-tx) var(--app-ease);
}
.module[open] .module__caret { transform: rotate(90deg); }
.module__caret svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round;
}
.module__lessons {
  padding: 0 18px 14px;
  display: none;
  flex-direction: column;
  gap: 4px;
}
.module[open] .module__lessons { display: flex; }
.lesson-row {
  display: grid;
  grid-template-columns: 24px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--na-color-on-surface);
  text-decoration: none;
}
.lesson-row:hover { background: var(--na-color-glass-tint); }
.lesson-row__icon {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  color: var(--na-color-primary-300);
}
[data-theme="light"] .lesson-row__icon { color: var(--na-color-primary-700); }
.lesson-row__icon svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.lesson-row[data-status="done"] .lesson-row__icon { color: #2EC27E; }
.lesson-row[data-status="done"] .lesson-row__icon svg { stroke-width: 2.4; }
.lesson-row__title {
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lesson-row[data-status="done"] .lesson-row__title { color: var(--na-color-on-surface-muted); text-decoration: line-through; text-decoration-color: rgba(143,168,255,0.45); }
.lesson-row__time {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  font-variant-numeric: tabular-nums;
}


/* ============================================================
   LESSON READER
   ============================================================ */
.reader {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 0 64px;
}
.reader__breadcrumb {
  display: flex; gap: 6px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.reader__breadcrumb a { color: var(--na-color-primary-300); text-decoration: none; }
[data-theme="light"] .reader__breadcrumb a { color: var(--na-color-primary-700); }
.reader__title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--na-color-on-surface);
  margin-bottom: 12px;
}
.reader__meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.reader__meta b { color: var(--na-color-on-surface); font-weight: 700; }
.reader__body {
  font-size: 16px;
  line-height: 1.75;
  color: var(--na-color-on-surface);
}
.reader__body p { margin: 0 0 18px; }
.reader__body h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin: 36px 0 14px;
}
.reader__body h3 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 28px 0 10px;
}
.reader__body strong { color: var(--na-color-primary-300); font-weight: 700; }
[data-theme="light"] .reader__body strong { color: var(--na-color-primary-700); }
.reader__body code {
  font-family: var(--na-font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
}
.reader__quote {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 3px solid #7A3FE4;
  background: linear-gradient(90deg, rgba(122, 63, 228, 0.08), transparent);
  border-radius: 0 12px 12px 0;
  font-size: 15px;
  font-style: italic;
  color: var(--na-color-on-surface);
}
.reader__quote cite {
  display: block;
  margin-top: 8px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-style: normal;
  letter-spacing: 0.10em;
  color: var(--na-color-on-surface-muted);
  text-transform: uppercase;
}
.reader__diagram {
  margin: 24px 0;
  padding: 24px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  display: grid; place-items: center;
}
[data-theme="light"] .reader__diagram { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.reader__diagram svg { max-width: 100%; height: auto; }
.reader__diagram-cap {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 12px;
  text-align: center;
}
.reader__nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--na-color-glass-border);
}
.reader__nav-btn {
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-surface-raised);
  text-decoration: none;
  color: var(--na-color-on-surface);
  display: flex; flex-direction: column; gap: 4px;
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.reader__nav-btn:hover { border-color: rgba(143, 168, 255, 0.30); }
[data-theme="light"] .reader__nav-btn { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.reader__nav-btn--next { text-align: right; }
.reader__nav-label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.reader__nav-title { font-size: 13px; font-weight: 700; letter-spacing: -0.01em; }

/* Reader sticky tools */
.reader-tools {
  position: sticky;
  top: 84px;
  display: none;
  flex-direction: column;
  gap: 8px;
  align-self: start;
  padding: 14px;
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
}
@media (min-width: 1280px) { .reader-tools { display: flex; } }
[data-theme="light"] .reader-tools { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.reader-tools__title {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 4px;
}
.reader-tools__btn {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--na-color-on-surface);
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.reader-tools__btn:hover { background: var(--na-color-glass-tint); border-color: var(--na-color-glass-border); }
.reader-tools__btn svg {
  width: 16px; height: 16px;
  stroke: currentColor; fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.reader-toc {
  display: flex; flex-direction: column;
  gap: 4px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--na-color-glass-border);
}
.reader-toc a {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 6px;
  border-left: 2px solid transparent;
}
.reader-toc a:hover { background: var(--na-color-glass-tint); color: var(--na-color-on-surface); border-left-color: #7A3FE4; }


/* ============================================================
   QUIZ
   ============================================================ */
.quiz-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.quiz-progress__bar {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--na-color-glass-border);
  overflow: hidden;
}
.quiz-progress__fill {
  display: block; height: 100%;
  background: linear-gradient(90deg, #5B5BFF, #7A3FE4);
}
.quiz-progress__count {
  font-family: var(--na-font-mono);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--na-color-on-surface);
}
.quiz-progress__timer {
  font-family: var(--na-font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-variant-numeric: tabular-nums;
}
.quiz-progress__timer svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; }

.quiz-card {
  border-radius: var(--app-radius-lg);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 28px;
  margin-bottom: 20px;
}
@media (max-width: 767px) { .quiz-card { padding: 20px; } }
[data-theme="light"] .quiz-card { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }

.quiz-card__num {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .quiz-card__num { color: var(--na-color-primary-700); }
.quiz-card__q {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.3;
  margin: 8px 0 24px;
  color: var(--na-color-on-surface);
}

.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-option {
  padding: 16px 18px;
  border-radius: 12px;
  border: 1.5px solid var(--na-color-glass-border);
  background: var(--na-color-surface);
  cursor: pointer;
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  align-items: center;
  text-align: left;
  font-family: var(--na-font-sans);
  color: var(--na-color-on-surface);
  font-size: 14px;
  letter-spacing: -0.01em;
  transition: all var(--app-tx-fast) var(--app-ease);
}
[data-theme="light"] .quiz-option { background: #F4F5FA; }
.quiz-option:hover { border-color: rgba(143, 168, 255, 0.40); }
.quiz-option__key {
  width: 32px; height: 32px;
  border-radius: 8px;
  display: grid; place-items: center;
  font-family: var(--na-font-mono);
  font-size: 12px;
  font-weight: 700;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
}
.quiz-option[aria-selected="true"] {
  border-color: #5B5BFF;
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.18), rgba(122, 63, 228, 0.14));
}
.quiz-option[aria-selected="true"] .quiz-option__key {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  border-color: transparent;
}

.quiz-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.quiz-foot__hint {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}


/* ============================================================
   ENTRY DETAIL (encyclopedia)
   ============================================================ */
.entry-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: center;
  padding: 24px;
  border-radius: var(--app-radius-lg);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  margin-bottom: 24px;
}
@media (min-width: 768px) { .entry-hero { grid-template-columns: 80px 1fr; gap: 24px; } }
[data-theme="light"] .entry-hero { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }

.entry-hero__big {
  width: 80px; height: 80px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.20), rgba(122, 63, 228, 0.16));
  border: 1px solid rgba(143, 168, 255, 0.25);
  display: grid; place-items: center;
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--na-color-on-surface);
}
.entry-hero__cat {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--na-color-primary-300);
}
[data-theme="light"] .entry-hero__cat { color: var(--na-color-primary-700); }
.entry-hero__title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--na-color-on-surface);
  margin: 6px 0 8px;
}
.entry-hero__short {
  font-size: 14px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}
.entry-hero__tags { display: flex; gap: 6px; flex-wrap: wrap; }

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.related {
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.related:hover { border-color: rgba(143, 168, 255, 0.30); transform: translateY(-2px); }
[data-theme="light"] .related { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.related__rel {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
}
.related__name {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 4px;
  color: var(--na-color-on-surface);
}

/* ============================================================
   FORUM THREAD DETAIL
   ============================================================ */
.thread-hero {
  padding: 24px;
  border-radius: var(--app-radius-lg);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  margin-bottom: 20px;
}
[data-theme="light"] .thread-hero { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.thread-hero__meta {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 14px;
}
.thread-hero__avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff; font-size: 13px; font-weight: 700;
  flex-shrink: 0;
}
.thread-hero__user-name { font-size: 13px; font-weight: 700; letter-spacing: -0.01em; }
.thread-hero__user-meta {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 2px;
}
.thread-hero__title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.25;
  color: var(--na-color-on-surface);
  margin-bottom: 12px;
}
.thread-hero__body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--na-color-on-surface);
  margin-bottom: 16px;
}
.thread-hero__body p { margin: 0 0 12px; }
.thread-hero__actions {
  display: flex; gap: 8px; flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px dashed var(--na-color-glass-border);
}
.thread-hero__btn {
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.thread-hero__btn svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.replies { display: flex; flex-direction: column; gap: 12px; }
.reply {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  padding: 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
}
[data-theme="light"] .reply { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.reply__avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff; font-size: 12px; font-weight: 700;
}
.reply__meta {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 6px;
}
.reply__meta b { color: var(--na-color-primary-300); }
[data-theme="light"] .reply__meta b { color: var(--na-color-primary-700); }
.reply__body { font-size: 13px; line-height: 1.6; color: var(--na-color-on-surface); }

.reply-composer {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--na-color-glass-border);
}
.reply-composer__field {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
  font-family: var(--na-font-sans);
  font-size: 13px;
  resize: vertical;
  min-height: 80px;
}
.reply-composer__field:focus { outline: none; border-color: rgba(143, 168, 255, 0.50); }


/* ============================================================
   LAB DETAIL — IMU oscilloscope-style sample
   ============================================================ */
.lab-stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
@media (min-width: 1024px) { .lab-stage { grid-template-columns: 2fr 1fr; } }

.scope {
  border-radius: var(--app-radius-lg);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122, 63, 228, 0.18), transparent 60%),
    var(--na-color-neutral-900);
  border: 1px solid rgba(143, 168, 255, 0.20);
  padding: 18px;
  color: #fff;
}
.scope__head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px;
}
.scope__title { font-size: 14px; font-weight: 700; letter-spacing: -0.02em; }
.scope__sub { font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.10em; opacity: 0.55; text-transform: uppercase; }
.scope__canvas {
  height: 200px;
  margin: 0 -18px;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(rgba(143, 168, 255, 0.06) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, rgba(143, 168, 255, 0.06) 1px, transparent 1px) 0 0 / 20px 20px;
}
.scope__canvas svg {
  width: 200%;
  height: 100%;
  position: absolute;
  left: 0;
  animation: wave-scroll 4s linear infinite;
}
.scope__legend {
  display: flex; gap: 14px; flex-wrap: wrap;
  margin-top: 14px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.scope__legend span {
  display: inline-flex; align-items: center; gap: 6px;
}
.scope__legend i {
  width: 10px; height: 2px; border-radius: 999px;
  font-style: normal;
}

.lab-controls {
  display: flex; flex-direction: column; gap: 12px;
}
.lab-ctrl {
  border-radius: 14px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 14px;
}
[data-theme="light"] .lab-ctrl { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.lab-ctrl__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}
.lab-ctrl__label b { color: var(--na-color-on-surface); font-weight: 700; }
.lab-ctrl__slider { width: 100%; accent-color: #7A3FE4; }
.lab-ctrl__row {
  display: flex; gap: 6px;
  margin-top: 8px;
}
.lab-ctrl__btn {
  flex: 1;
  padding: 8px;
  border-radius: 8px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  cursor: pointer;
}
.lab-ctrl__btn[aria-selected="true"] {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  border-color: transparent;
}

/* ============================================================
   NOTIFICATIONS
   ============================================================ */
.notif-list { display: flex; flex-direction: column; gap: 8px; }
.notif {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
[data-theme="light"] .notif { background: var(--na-color-neutral-0); border-color: rgba(15, 23, 42, 0.06); }
.notif:hover { border-color: rgba(143, 168, 255, 0.30); }
.notif--unread { background: linear-gradient(135deg, rgba(91, 91, 255, 0.10), rgba(122, 63, 228, 0.06)); border-color: rgba(143, 168, 255, 0.25); }
[data-theme="light"] .notif--unread { background: linear-gradient(135deg, rgba(61, 91, 217, 0.06), rgba(108, 50, 204, 0.04)); }
.notif__icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-primary-300);
}
[data-theme="light"] .notif__icon { color: var(--na-color-primary-700); }
.notif__icon svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.notif__icon--success { background: rgba(46, 194, 126, 0.14); border-color: rgba(46, 194, 126, 0.35); color: #2EC27E; }
.notif__icon--warn    { background: rgba(240, 183, 58, 0.14); border-color: rgba(240, 183, 58, 0.35); color: #F0B73A; }
.notif__icon--info    { background: rgba(91, 91, 255, 0.16); border-color: rgba(91, 91, 255, 0.35); }
.notif__body { min-width: 0; }
.notif__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--na-color-on-surface);
  margin-bottom: 2px;
}
.notif__sub {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.notif__time {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--na-color-on-surface-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.notif__day-header {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin: 18px 0 10px;
  font-weight: 700;
}


/* ============================================================
   LAB SENSOR DETAIL — calibration UI
   ============================================================ */
.lab-tile__chip--done {
  color: #2EC27E;
  border-color: rgba(46, 194, 126, 0.35);
}
.lab-tile__meta {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.lab-tile__meta-pill {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.10em;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface-muted);
  text-transform: uppercase;
}

.lab-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 32px;
}
@media (min-width: 1024px) {
  .lab-detail { grid-template-columns: 1.7fr 1fr; }
}

.lab-detail__main {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.lab-detail__rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.lab-card {
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  border-radius: var(--app-radius);
  padding: 18px;
}
[data-theme="light"] .lab-card { background: var(--na-color-neutral-0); }

.lab-card__head {
  margin-bottom: 14px;
}
.lab-card__title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--na-color-on-surface);
}
.lab-card__sub {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 3px;
}

/* Variant chips */
.variant-chips {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}
.variant-chip {
  text-align: left;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--na-color-glass-border);
  background: transparent;
  color: var(--na-color-on-surface);
  cursor: pointer;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.variant-chip:hover {
  border-color: rgba(143, 168, 255, 0.40);
  transform: translateY(-1px);
}
.variant-chip.is-active {
  background: linear-gradient(135deg, rgba(91,91,255,0.15), rgba(122,63,228,0.10));
  border-color: rgba(143,168,255,0.50);
  box-shadow: inset 0 0 0 1px rgba(143,168,255,0.30);
}
.variant-chip__vendor {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-primary-300);
  font-weight: 700;
}
[data-theme="light"] .variant-chip__vendor { color: var(--na-color-primary-700); }
.variant-chip__part {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 4px 0 4px;
}
.variant-chip__price {
  font-family: var(--na-font-mono);
  font-size: 11px;
  color: var(--na-color-on-surface-muted);
}

/* Spec grid */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.spec-item {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
}
.spec-item__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 4px;
}
.spec-item__value {
  font-size: 13px;
  font-weight: 600;
  color: var(--na-color-on-surface);
}
.spec-summary {
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.6;
  padding: 10px 12px;
  background: var(--na-color-glass-tint);
  border-radius: 8px;
  margin-bottom: 12px;
}
.spec-links {
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.spec-links a {
  color: var(--na-color-primary-300);
  text-decoration: none;
  margin-right: 8px;
}
.spec-links a:hover { text-decoration: underline; }
[data-theme="light"] .spec-links a { color: var(--na-color-primary-700); }

/* Calibration purpose & materials */
.cal-purpose {
  font-size: 13px;
  color: var(--na-color-on-surface);
  line-height: 1.6;
  margin: 0 0 12px;
}
.materials-label {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 6px;
}
.materials-list {
  margin: 0; padding-left: 18px;
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.7;
}

/* Calibration progress bar */
.cal-progress-bar {
  height: 6px;
  background: var(--na-color-glass-tint);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 14px;
}
.cal-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #5B5BFF, #7A3FE4);
  transition: width 0.4s var(--app-ease);
}

/* Calibration steps */
.cal-steps {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cal-step {
  border-radius: 10px;
  border: 1px solid var(--na-color-glass-border);
  padding: 12px;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.cal-step[data-status="passed"] {
  border-color: rgba(46, 194, 126, 0.40);
  background: rgba(46, 194, 126, 0.05);
}
.cal-step[data-status="running"] {
  border-color: rgba(143, 168, 255, 0.50);
  background: rgba(91, 91, 255, 0.05);
}
.cal-step[data-status="failed"] {
  border-color: rgba(242, 94, 98, 0.40);
}
.cal-step[data-status="skipped"] {
  opacity: 0.6;
}
.cal-step__head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.cal-step__num {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-weight: 700;
  border-radius: 50%;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
}
.cal-step[data-status="passed"] .cal-step__num {
  background: #2EC27E;
  color: #fff;
  border-color: #2EC27E;
}
.cal-step__title {
  flex: 1;
  font-size: 13px;
  font-weight: 600;
  color: var(--na-color-on-surface);
}
.cal-step__type {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  padding: 3px 7px;
  border-radius: 4px;
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface-muted);
  font-weight: 700;
}
.cal-step__status {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  font-weight: 700;
  color: var(--na-color-on-surface-muted);
}
.cal-step[data-status="passed"] .cal-step__status { color: #2EC27E; }
.cal-step[data-status="failed"] .cal-step__status { color: #F25E62; }

.cal-step__body {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--na-color-glass-border);
}
.cal-step__instruction {
  font-size: 12px;
  color: var(--na-color-on-surface);
  line-height: 1.6;
  margin-bottom: 6px;
}
.cal-step__expected {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  background: var(--na-color-glass-tint);
  padding: 6px 8px;
  border-radius: 6px;
  margin-bottom: 8px;
}
.cal-step__expected span {
  font-weight: 700;
  color: var(--na-color-primary-300);
  margin-right: 6px;
  letter-spacing: 0.10em;
}
[data-theme="light"] .cal-step__expected span { color: var(--na-color-primary-700); }
.cal-step__bar {
  height: 4px;
  background: var(--na-color-glass-tint);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 10px;
}
.cal-step__bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #5B5BFF, #7A3FE4);
  transition: width 0.2s linear;
}
.cal-step__actions {
  display: flex; gap: 8px;
  flex-wrap: wrap;
}
.btn-cal-start, .btn-cal-skip {
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  font-family: var(--na-font-sans);
}
.btn-cal-start {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
}
.btn-cal-skip {
  background: transparent;
  color: var(--na-color-on-surface-muted);
  border: 1px solid var(--na-color-glass-border);
}
.btn-cal-skip:hover { color: var(--na-color-on-surface); }
.cal-step__msg {
  margin-top: 8px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--na-color-on-surface-muted);
  min-height: 14px;
}

/* Completion badge */
.lab-card--completion {
  background: linear-gradient(135deg, rgba(91,91,255,0.10), rgba(122,63,228,0.05));
}
.completion-badge {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px dashed var(--na-color-glass-border);
}
.completion-badge.is-done {
  background: linear-gradient(135deg, rgba(46,194,126,0.15), rgba(46,194,126,0.05));
  border: 1px solid rgba(46, 194, 126, 0.40);
  border-style: solid;
}
.completion-badge__icon {
  font-size: 32px;
  filter: grayscale(0.7);
}
.completion-badge.is-done .completion-badge__icon {
  filter: none;
  animation: pop 0.4s var(--app-ease-spring);
}
@keyframes pop {
  0% { transform: scale(0.5); }
  100% { transform: scale(1); }
}
.completion-badge__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--na-color-on-surface);
  margin-bottom: 3px;
}
.completion-badge__desc {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
}

/* Reference list */
.ref-list {
  list-style: none;
  margin: 0; padding: 0;
  font-size: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ref-list a {
  color: var(--na-color-primary-300);
  text-decoration: none;
  font-family: var(--na-font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}
.ref-list a:hover { text-decoration: underline; }
[data-theme="light"] .ref-list a { color: var(--na-color-primary-700); }


/* Sidebar signout link */
.app-navlink--signout {
  margin-top: 12px;
  border-top: 1px dashed var(--na-color-glass-border);
  padding-top: 14px;
  color: var(--na-color-on-surface-muted);
}
.app-navlink--signout:hover {
  color: #F25E62;
  background: rgba(242, 94, 98, 0.08);
}


/* ============================================================
   LESSON CONTENT BLOCKS — data-driven render
   ============================================================ */
.lesson-h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin: 0 0 16px;
  color: var(--na-color-on-surface);
}
.lesson-h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 32px 0 12px;
  color: var(--na-color-on-surface);
}
.lesson-h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 24px 0 10px;
  color: var(--na-color-on-surface);
}
.reader__body p,
.reader__body ul,
.reader__body ol,
.reader__body table {
  margin: 0 0 16px;
}
.lesson-callout {
  padding: 14px 16px;
  border-radius: 12px;
  margin: 16px 0;
  border-left: 3px solid;
  display: flex;
  gap: 10px;
}
.lesson-callout--info {
  background: rgba(91, 91, 255, 0.10);
  border-color: var(--na-color-primary-500);
}
.lesson-callout--tip {
  background: rgba(46, 194, 126, 0.10);
  border-color: var(--na-color-success-500);
}
.lesson-callout--warning {
  background: rgba(240, 183, 58, 0.10);
  border-color: var(--na-color-warning-500);
}
.lesson-callout__body {
  font-size: 14px;
  line-height: 1.6;
  color: var(--na-color-on-surface);
}

.lesson-code {
  background: var(--na-color-surface-deep);
  border: 1px solid var(--na-color-glass-border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--na-font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--na-color-on-surface);
  margin: 16px 0;
}

.lesson-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 16px 0;
}
.lesson-table th, .lesson-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.lesson-table th {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  background: var(--na-color-glass-tint);
}
.lesson-table tr:hover {
  background: var(--na-color-glass-tint);
}

.retrieval-prompt {
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.08), rgba(122, 63, 228, 0.04));
  border: 1px dashed rgba(143, 168, 255, 0.40);
  border-radius: 12px;
  padding: 14px 16px;
  margin: 16px 0;
}
.retrieval-prompt summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--na-color-on-surface);
  list-style: none;
}
.retrieval-prompt summary::-webkit-details-marker { display: none; }
.retrieval-prompt summary::after {
  content: " (klik untuk lihat jawaban)";
  font-size: 11px;
  font-family: var(--na-font-mono);
  color: var(--na-color-on-surface-muted);
}
.retrieval-prompt[open] summary::after {
  content: " ↓";
}
.retrieval-prompt__answer {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(143, 168, 255, 0.30);
  font-size: 13px;
  line-height: 1.6;
  color: var(--na-color-on-surface);
}

.lesson-figure {
  margin: 20px 0;
  text-align: center;
}
.lesson-figure img {
  max-width: 100%;
  border-radius: 8px;
}
.lesson-figure figcaption {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-top: 8px;
}

/* Retrieval check section */
.retrieval-check {
  margin-top: 32px;
  padding: 24px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  border-radius: 14px;
}
.retrieval-check__title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.retrieval-check__item {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--na-color-glass-border);
}
.retrieval-check__item:last-child {
  border-bottom: none;
}
.retrieval-check__q {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--na-color-on-surface);
}
.retrieval-check__options {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.retrieval-check__option {
  padding: 10px 12px;
  border: 1px solid var(--na-color-glass-border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s var(--app-ease);
}
.retrieval-check__option:hover {
  border-color: rgba(143, 168, 255, 0.40);
}
.retrieval-check__option.is-correct {
  background: rgba(46, 194, 126, 0.10);
  border-color: var(--na-color-success-500);
}
.retrieval-check__option.is-wrong {
  background: rgba(242, 94, 98, 0.10);
  border-color: var(--na-color-danger-500);
}
.retrieval-check__feedback {
  margin-top: 8px;
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
}
.retrieval-check__textarea {
  width: 100%;
  min-height: 80px;
  padding: 10px 12px;
  border: 1px solid var(--na-color-glass-border);
  border-radius: 8px;
  background: transparent;
  color: var(--na-color-on-surface);
  font-family: var(--na-font-sans);
  font-size: 13px;
  resize: vertical;
}


/* ============================================================
   LAB TIER SECTION (basic / intermediate / biosignal)
   ============================================================ */
.tier-section {
  margin-bottom: 36px;
}
.tier-section + .tier-section {
  margin-top: 36px;
}
.tier-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--na-color-glass-border);
  flex-wrap: wrap;
}
.tier-header__badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  font-family: var(--na-font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  font-size: 11px;
  color: #fff;
  white-space: nowrap;
}
.tier-header__badge--basic {
  background: linear-gradient(135deg, #5B5BFF, #3D5BD9);
}
.tier-header__badge--intermediate {
  background: linear-gradient(135deg, #7A3FE4, #5B5BFF);
}
.tier-header__badge--biosignal {
  background: linear-gradient(135deg, #34C2DD, #1A8BA3);
}
.tier-header__count {
  background: rgba(255, 255, 255, 0.25);
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 10px;
}
.tier-header__label {
  font-size: 12px;
  letter-spacing: 0.14em;
}
.tier-header__desc {
  flex: 1;
  min-width: 220px;
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  margin: 0;
}

.lab-tile__tier-badge {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.10em;
  padding: 3px 7px;
  border-radius: 4px;
  text-transform: uppercase;
}
.lab-tile__tier-badge--biosignal {
  background: linear-gradient(135deg, #34C2DD, #1A8BA3);
  color: #fff;
  margin-right: 6px;
}


/* ============================================================
   ONBOARDING — interest grid + level list
   ============================================================ */
.onb-interest-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 20px;
}
@media (min-width: 768px) {
  .onb-interest-grid { grid-template-columns: repeat(4, 1fr); }
}
.onb-interest-chip {
  padding: 18px 14px;
  border-radius: 14px;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
  cursor: pointer;
  transition: all 0.18s var(--app-ease);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}
.onb-interest-chip:hover {
  border-color: rgba(143, 168, 255, 0.40);
  transform: translateY(-1px);
}
.onb-interest-chip.is-selected {
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.20), rgba(122, 63, 228, 0.15));
  border-color: rgba(143, 168, 255, 0.60);
  box-shadow: 0 0 0 2px rgba(143, 168, 255, 0.30);
}
.onb-interest-chip__icon {
  font-size: 26px;
  line-height: 1;
}
.onb-interest-chip__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--na-color-on-surface);
}

.onb-level-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 20px;
  text-align: left;
}
.onb-level-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--na-color-glass-border);
  cursor: pointer;
  transition: all 0.18s var(--app-ease);
}
.onb-level-row:hover {
  border-color: rgba(143, 168, 255, 0.40);
}
.onb-level-row.is-selected {
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.15), rgba(122, 63, 228, 0.10));
  border-color: rgba(143, 168, 255, 0.50);
}
.onb-level-row input[type="radio"] {
  width: 18px; height: 18px;
  accent-color: var(--na-color-primary-500);
}
.onb-level-row__label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--na-color-on-surface);
  margin-bottom: 2px;
}
.onb-level-row__desc {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
}


/* ============================================================
   ADMIN CONSOLE
   ============================================================ */
.admin-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
@media (max-width: 767px) {
  .admin-shell { grid-template-columns: 1fr; }
}

.admin-sidebar {
  border-right: 1px solid var(--na-color-glass-border);
  padding: 22px 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: rgba(11, 15, 26, 0.50);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
[data-theme="light"] .admin-sidebar {
  background: rgba(255, 255, 255, 0.6);
  border-color: rgba(15, 23, 42, 0.06);
}
@media (max-width: 767px) {
  .admin-sidebar { display: none; }
}

.admin-brand {
  display: flex; gap: 10px;
  align-items: center;
  padding: 6px 8px;
  text-decoration: none;
  color: var(--na-color-on-surface);
}
.admin-brand__mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  font-size: 18px;
}
.admin-brand__name { display: flex; flex-direction: column; }
.admin-brand__name b { font-size: 13px; font-weight: 800; }
.admin-brand__name span {
  font-family: var(--na-font-mono);
  font-size: 8px;
  letter-spacing: 0.16em;
  color: var(--na-color-on-surface-muted);
  margin-top: 2px;
}

.admin-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.admin-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  color: var(--na-color-on-surface-muted);
  transition: background 0.15s ease, color 0.15s ease;
}
.admin-nav a:hover {
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
}
.admin-nav a[aria-current="page"] {
  background: linear-gradient(135deg, rgba(91, 91, 255, 0.18), rgba(122, 63, 228, 0.12));
  color: var(--na-color-on-surface);
}
.admin-nav a svg {
  width: 16px; height: 16px;
  fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
}

.admin-sidebar__foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 14px;
  border-top: 1px dashed var(--na-color-glass-border);
}
.admin-back-link {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--na-color-on-surface-muted);
  letter-spacing: 0.04em;
}
.admin-back-link:hover {
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
}
.admin-back-link svg {
  width: 14px; height: 14px;
  fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round;
}

.admin-main {
  padding: 28px 32px;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
}
@media (max-width: 767px) { .admin-main { padding: 20px 16px; } }

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}
.admin-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--na-color-on-surface);
}
.admin-sub {
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  margin-top: 4px;
}
.admin-header__user {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
}
.admin-header__avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff; font-weight: 700;
}

.admin-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}
.admin-stat {
  padding: 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
}
[data-theme="light"] .admin-stat { background: var(--na-color-neutral-0); }
.admin-stat__label {
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 6px;
}
.admin-stat__value {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  margin-bottom: 4px;
}
.admin-stat__delta {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
}

.admin-section {
  margin-bottom: 32px;
}
.admin-section__head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 14px;
}
.admin-section__title {
  font-size: 15px; font-weight: 700; letter-spacing: -0.01em;
}

.admin-quick-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}
.admin-quick-card {
  padding: 16px;
  border-radius: 12px;
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  text-decoration: none;
  color: inherit;
  transition: all 0.15s ease;
}
.admin-quick-card:hover {
  border-color: rgba(143, 168, 255, 0.40);
  transform: translateY(-1px);
}
.admin-quick-card__icon { font-size: 26px; margin-bottom: 10px; }
.admin-quick-card__title {
  font-size: 14px; font-weight: 700; letter-spacing: -0.01em;
  margin-bottom: 4px;
}
.admin-quick-card__desc {
  font-size: 12px; color: var(--na-color-on-surface-muted);
  line-height: 1.5;
}

.admin-health {
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  border-radius: 12px;
  overflow: hidden;
}
.admin-health__row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.admin-health__row:last-child { border-bottom: none; }
.admin-health__label { font-size: 13px; font-weight: 600; }
.admin-health__status {
  font-family: var(--na-font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.05em;
  background: var(--na-color-glass-tint);
}
.admin-health__status--ok { color: #2EC27E; background: rgba(46, 194, 126, 0.15); }
.admin-health__status--warn { color: #F0B73A; background: rgba(240, 183, 58, 0.15); }
.admin-health__status--fail { color: #F25E62; background: rgba(242, 94, 98, 0.15); }

.admin-activity-list {
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  border-radius: 12px;
  overflow: hidden;
}
.admin-activity-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.admin-activity-row:last-child { border-bottom: none; }
.admin-activity-row__icon {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: rgba(46, 194, 126, 0.15);
  color: #2EC27E;
  display: grid; place-items: center;
  font-weight: 800;
}
.admin-activity-row__body { flex: 1; min-width: 0; }
.admin-activity-row__title { font-size: 13px; font-weight: 600; }
.admin-activity-row__meta {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  margin-top: 2px;
}
.admin-activity-row__type {
  font-family: var(--na-font-mono);
  font-size: 9px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface-muted);
}

.admin-search {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  width: 280px;
  max-width: 100%;
}
.admin-search svg {
  width: 16px; height: 16px;
  fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round;
  color: var(--na-color-on-surface-muted);
}
.admin-search input {
  flex: 1; min-width: 0;
  background: transparent;
  border: none;
  outline: none;
  font-size: 13px;
  color: var(--na-color-on-surface);
  font-family: var(--na-font-sans);
}

.admin-table-wrap {
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  border-radius: 12px;
  overflow-x: auto;
}
[data-theme="light"] .admin-table-wrap { background: var(--na-color-neutral-0); }

.admin-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}
.admin-table th {
  text-align: left;
  font-family: var(--na-font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--na-color-on-surface-muted);
  padding: 12px 16px;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.admin-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--na-color-glass-border);
  font-size: 13px;
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--na-color-glass-tint); }

.admin-avatar-sm {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  color: #fff; font-weight: 700; font-size: 12px;
}

.admin-role {
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.admin-role--admin { background: linear-gradient(135deg, #FFD700, #FFA500); color: #000; }
.admin-role--learner { background: var(--na-color-glass-tint); color: var(--na-color-on-surface-muted); }
.admin-role--mentor { background: rgba(122, 63, 228, 0.20); color: #B68BFF; }

.admin-status {
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.06em;
}
.admin-status--on { background: rgba(46, 194, 126, 0.15); color: #2EC27E; }
.admin-status--off { background: var(--na-color-glass-tint); color: var(--na-color-on-surface-muted); }

.admin-btn {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
  cursor: pointer;
  text-decoration: none;
  font-family: var(--na-font-sans);
  display: inline-block;
  transition: all 0.15s ease;
}
.admin-btn:hover {
  border-color: rgba(143, 168, 255, 0.40);
}
.admin-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.admin-btn--primary {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  color: #fff;
  border-color: transparent;
}
.admin-btn--danger {
  background: rgba(242, 94, 98, 0.12);
  border-color: rgba(242, 94, 98, 0.40);
  color: #F25E62;
}

.admin-form { max-width: 580px; }
.admin-field { margin-bottom: 16px; }
.admin-field__label {
  display: block;
  font-family: var(--na-font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 6px;
}
.admin-field__input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--na-color-glass-border);
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
  font-size: 14px;
  font-family: var(--na-font-sans);
}
.admin-field__input:focus {
  outline: none;
  border-color: rgba(143, 168, 255, 0.50);
  box-shadow: 0 0 0 3px rgba(91, 91, 255, 0.15);
}
.admin-field__hint {
  display: block;
  font-size: 11px;
  color: var(--na-color-on-surface-muted);
  margin-top: 4px;
}

.admin-preview {
  margin-top: 18px;
}
.admin-preview__head {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 10px;
}
.admin-preview__card {
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--na-color-surface-deep);
  border: 1px solid rgba(143, 168, 255, 0.30);
}
.admin-preview__title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 6px;
}
.admin-preview__body {
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
  line-height: 1.5;
  margin-bottom: 8px;
}
.admin-preview__meta {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
}


/* Admin link di sidebar pelajar (untuk admin) */
.app-navlink--admin {
  margin-top: 8px;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.10), rgba(255, 165, 0, 0.06));
  border: 1px dashed rgba(255, 215, 0, 0.40);
  color: var(--na-color-on-surface);
}
.app-navlink--admin:hover {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.18), rgba(255, 165, 0, 0.12));
}


/* ============================================================
   PROFILE — extension classes (info, email, meta, interests, actions)
   ============================================================ */
.profile-hero__info {
  flex: 1;
  min-width: 0;
}
.profile-hero__email {
  font-family: var(--na-font-mono);
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  margin: 4px 0 12px;
  word-break: break-all;
}
.profile-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
.profile-hero__interests {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}
.profile-hero__actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  flex-shrink: 0;
}
@media (min-width: 768px) {
  .profile-hero__actions { margin-top: 0; align-self: flex-start; }
}


/* ============================================================
   MARKDOWN RENDERER — for /app/wiki/ pages
   ============================================================ */
.md-h {
  color: var(--na-color-on-surface);
  letter-spacing: -0.02em;
  margin: 1.4em 0 0.5em;
  line-height: 1.25;
}
.md-h1 { font-size: 28px; font-weight: 800; letter-spacing: -0.03em; }
.md-h2 {
  font-size: 22px;
  font-weight: 700;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.md-h3 { font-size: 18px; font-weight: 700; }
.md-h4 { font-size: 15px; font-weight: 700; color: var(--na-color-primary-300); }
.md-h5, .md-h6 { font-size: 13px; font-weight: 700; color: var(--na-color-on-surface-muted); text-transform: uppercase; letter-spacing: 0.06em; }

.reader__body p { margin: 0.8em 0; line-height: 1.7; color: var(--na-color-on-surface); }
.reader__body ul, .reader__body ol { margin: 0.7em 0 0.7em 1.4em; line-height: 1.7; }
.reader__body li { margin: 0.25em 0; }
.reader__body a { color: var(--na-color-primary-300); text-decoration: underline; text-decoration-thickness: 1px; }
.reader__body a:hover { color: var(--na-color-primary-200); }
.reader__body code {
  font-family: var(--na-font-mono);
  font-size: 0.9em;
  padding: 1px 6px;
  border-radius: 5px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-primary-300);
}
.reader__body hr {
  border: none;
  border-top: 1px solid var(--na-color-glass-border);
  margin: 24px 0;
}
.reader__body strong { color: var(--na-color-on-surface); font-weight: 700; }
.reader__body em { font-style: italic; color: var(--na-color-on-surface); }

.md-code {
  margin: 14px 0;
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--na-color-surface-deep, #0A0F1F);
  border: 1px solid var(--na-color-glass-border);
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.6;
}
.md-code code {
  font-family: var(--na-font-mono);
  background: transparent;
  border: none;
  padding: 0;
  color: var(--na-color-on-surface);
  font-size: inherit;
}
[data-theme="light"] .md-code { background: #F7F8FB; }

.md-quote {
  margin: 14px 0;
  padding: 10px 16px;
  border-left: 3px solid var(--na-color-primary-300);
  background: var(--na-color-glass-tint);
  border-radius: 0 8px 8px 0;
  color: var(--na-color-on-surface-muted);
  font-style: italic;
  line-height: 1.6;
}

.md-table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 13px;
  border: 1px solid var(--na-color-glass-border);
  border-radius: 8px;
  overflow: hidden;
}
.md-table th, .md-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--na-color-glass-border);
}
.md-table th {
  background: var(--na-color-glass-tint);
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  font-weight: 700;
}
.md-table tr:last-child td { border-bottom: none; }
.md-table tbody tr:hover { background: var(--na-color-glass-tint); }

/* ---- Markdown images & figures ---- */
.md-img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--na-radius-md);
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
}
.md-figure {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.md-figure .md-img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  padding: 8px;
  box-shadow: var(--na-elev-2);
}
.md-figcap {
  font-size: 12px;
  color: var(--na-color-on-surface-muted);
  font-style: italic;
  text-align: center;
  line-height: 1.5;
}
/* inline image inside a paragraph stays modest */
p > .md-img { display: inline-block; vertical-align: middle; margin: 4px 0; }


/* ============================================================
   READER TOC — wiki page sidebar links
   ============================================================ */
.reader-toc {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
}
.reader-toc a {
  color: var(--na-color-on-surface-muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 6px;
  border-left: 2px solid transparent;
  line-height: 1.45;
  transition: all var(--app-tx-fast) var(--app-ease);
}
.reader-toc a:hover {
  color: var(--na-color-on-surface);
  background: var(--na-color-glass-tint);
  border-left-color: var(--na-color-primary-300);
}
.reader-toc a[data-toc-level="3"] { padding-left: 18px; font-size: 11px; }


/* ============================================================
   ANIMATED ICONS — defaults + reduced-motion fallback
   ============================================================ */
.na-icon {
  vertical-align: middle;
  flex-shrink: 0;
  /* Hint to compositor for smoother transforms */
  will-change: transform, opacity;
}
@media (prefers-reduced-motion: reduce) {
  /* Pause all SMIL animations inside icons */
  .na-icon animate,
  .na-icon animateTransform,
  .na-icon animateMotion {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}


/* ============================================================
   STATIC SVG → ANIMATED ON HOVER / FOCUS / ACTIVE STATE
   For inline SVGs that aren't from the icon library, add subtle
   looping motion when their container is interactive.
   ============================================================ */

/* Pulse-loop ring around icon button on hover */
.app-iconbtn:hover svg,
.thread-hero__btn:hover svg,
.reader-tools__btn:hover svg,
.lab-tile__cta:hover svg,
.course-card__bookmark:hover svg,
.rail-mentor__btn:hover svg {
  animation: na-icon-bounce 1.2s ease-in-out infinite;
}
@keyframes na-icon-bounce {
  0%, 100% { transform: translateY(0) scale(1); }
  50%      { transform: translateY(-1px) scale(1.08); }
}

/* Active nav links — gentle drift */
.app-navlink[aria-current="page"] svg,
.app-tab[aria-current="page"] svg {
  animation: na-icon-drift 3s ease-in-out infinite;
}
@keyframes na-icon-drift {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 0 transparent); }
  50%      { transform: scale(1.10); filter: drop-shadow(0 2px 6px rgba(91,91,255,0.55)); }
}

/* Brand mark — synapse pulse already styled, keep but add depth */
.app-brand__mark svg,
.auth-brand__mark svg {
  animation: na-brand-spark 4s ease-in-out infinite;
  transform-origin: center;
}
@keyframes na-brand-spark {
  0%, 100% { transform: scale(1); }
  48%      { transform: scale(1); }
  52%      { transform: scale(1.10); }
  56%      { transform: scale(1); }
}

/* Course card duration clock — spinning needle */
.rec-card__foot > svg:first-of-type circle,
.course-card__foot > svg circle {
  /* nothing — just placeholder */
}
.rec-card__foot > svg:first-of-type,
.course-card__foot > svg:first-child {
  animation: na-clock-spin 12s linear infinite;
}
@keyframes na-clock-spin {
  to { transform: rotate(360deg); }
}

/* Star rating — gentle twinkle */
.course-card__rating svg,
.rec-card__rating svg {
  animation: na-star-twinkle 2.4s ease-in-out infinite;
  transform-origin: center;
}
@keyframes na-star-twinkle {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.7; transform: scale(0.92); }
}

/* CTA arrow — drifts right on idle, snaps back on hover */
.app-continue__cta svg {
  animation: na-arrow-drift 1.8s ease-in-out infinite;
}
.app-continue__cta:hover svg {
  animation: none;
  transform: translateX(4px);
}
@keyframes na-arrow-drift {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(3px); }
}

/* Notification pulse — for unread items */
.notif--unread .notif__icon {
  animation: na-notif-glow 2.4s ease-in-out infinite;
}
@keyframes na-notif-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(91, 91, 255, 0.45); }
  50%      { box-shadow: 0 0 0 6px rgba(91, 91, 255, 0); }
}

/* Live chip dot reuse — keep existing, sharpen */
.instrument__chip-dot {
  animation: live-pulse 1.6s ease-in-out infinite;
}

/* Reduced-motion guard for all CSS-driven icon animations */
@media (prefers-reduced-motion: reduce) {
  .app-iconbtn:hover svg,
  .thread-hero__btn:hover svg,
  .reader-tools__btn:hover svg,
  .lab-tile__cta:hover svg,
  .course-card__bookmark:hover svg,
  .rail-mentor__btn:hover svg,
  .app-navlink[aria-current="page"] svg,
  .app-tab[aria-current="page"] svg,
  .app-brand__mark svg,
  .auth-brand__mark svg,
  .rec-card__foot > svg:first-of-type,
  .course-card__foot > svg:first-child,
  .course-card__rating svg,
  .rec-card__rating svg,
  .app-continue__cta svg,
  .notif--unread .notif__icon {
    animation: none !important;
  }
}


/* ============================================================
   AUTH BRAND — synapse pulse (target inline SVG circles)
   ============================================================ */
.auth-brand__mark svg circle {
  transform-origin: center;
  animation: na-synapse-blink 2.6s ease-in-out infinite;
}
.auth-brand__mark svg circle:nth-of-type(1) { animation-delay: 0s; }
.auth-brand__mark svg circle:nth-of-type(2) { animation-delay: 0.4s; }
.auth-brand__mark svg circle:nth-of-type(3) { animation-delay: 0.8s; }
.auth-brand__mark svg circle:nth-of-type(4) { animation-delay: 1.0s; }
.auth-brand__mark svg circle:nth-of-type(5) { animation-delay: 1.2s; }
@keyframes na-synapse-blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

@media (prefers-reduced-motion: reduce) {
  .auth-brand__mark svg circle { animation: none !important; opacity: 1 !important; }
}


/* ============================================================
   PROJECT EDITOR — full-height IDE-like layout
   ============================================================ */
.editor-shell {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--na-color-surface);
  z-index: 1;
}
.editor-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--na-color-glass-border);
  background: var(--na-color-surface-raised);
  flex-shrink: 0;
}
.editor-back {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  text-decoration: none;
  font-size: 18px;
  flex-shrink: 0;
}
.editor-title-input {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 6px 10px;
  color: var(--na-color-on-surface);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
  min-width: 140px;
  max-width: 280px;
}
.editor-title-input:hover { border-color: var(--na-color-glass-border); }
.editor-title-input:focus { outline: none; border-color: var(--na-color-primary-300); background: var(--na-color-glass-tint); }
.editor-save-state {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--na-color-on-surface-muted);
}
.editor-peers {
  display: inline-flex;
  align-items: center;
  gap: -6px;
  margin-left: 4px;
}
.editor-peers__solo {
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  opacity: 0.6;
}
.editor-peer {
  width: 26px; height: 26px;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  color: #fff;
  font-size: 10px;
  font-weight: 800;
  border: 2px solid var(--na-color-surface-raised);
  margin-left: -6px;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.1);
  animation: na-peer-pop 240ms var(--app-ease-spring, ease);
}
@keyframes na-peer-pop {
  from { transform: scale(0); }
  to { transform: scale(1); }
}
.editor-peer-cursors {
  display: none;
  gap: 8px;
  flex-wrap: wrap;
  padding: 5px 14px;
  background: var(--na-color-surface-raised);
  border-top: 1px solid var(--na-color-glass-border);
}
.editor-peer-cursor {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  padding: 2px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--pc) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--pc) 40%, transparent);
}
.editor-peer-cursor__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--pc);
  box-shadow: 0 0 6px var(--pc);
  animation: live-pulse 1.6s ease-in-out infinite;
}
.editor-select {
  padding: 7px 10px;
  border-radius: 9px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 12px;
  cursor: pointer;
}
.editor-btn {
  padding: 8px 14px;
  border-radius: 9px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
.editor-btn--primary {
  background: linear-gradient(135deg, #5B5BFF, #7A3FE4);
  border: none;
  color: #fff;
}
.editor-btn:disabled { opacity: 0.6; cursor: wait; }

.editor-body {
  flex: 1;
  display: flex;
  min-height: 0;
}
@media (max-width: 760px) {
  .editor-body { flex-direction: column; }
  .editor-divider { display: none; }
}
.editor-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
.editor-pane--code { flex: 0 0 50%; border-right: 1px solid var(--na-color-glass-border); }
.editor-pane--preview { flex: 1; }
@media (max-width: 760px) {
  .editor-pane--code { flex: 1; border-right: none; border-bottom: 1px solid var(--na-color-glass-border); }
}

.editor-divider {
  width: 6px;
  background: var(--na-color-glass-border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background var(--app-tx-fast);
}
.editor-divider:hover { background: var(--na-color-primary-500); }

.editor-tabs {
  display: flex;
  gap: 2px;
  padding: 6px 8px 0;
  background: var(--na-color-surface-raised);
  overflow-x: auto;
  flex-shrink: 0;
  scrollbar-width: thin;
}
.editor-tab {
  padding: 7px 12px;
  border: none;
  border-radius: 8px 8px 0 0;
  background: transparent;
  color: var(--na-color-on-surface-muted);
  font-size: 12px;
  font-family: var(--na-font-mono);
  cursor: pointer;
  white-space: nowrap;
}
.editor-tab.is-active {
  background: var(--na-color-surface);
  color: var(--na-color-on-surface);
}
.editor-tab--add { color: var(--na-color-primary-300); font-weight: 700; }

.editor-code {
  flex: 1;
  width: 100%;
  border: none;
  resize: none;
  padding: 14px 16px;
  background: var(--na-color-surface);
  color: var(--na-color-on-surface);
  font-family: var(--na-font-mono);
  font-size: 13px;
  line-height: 1.6;
  tab-size: 2;
  white-space: pre;
  overflow: auto;
}
.editor-code:focus { outline: none; }

.editor-meta {
  display: flex;
  justify-content: space-between;
  padding: 5px 14px;
  background: var(--na-color-surface-raised);
  border-top: 1px solid var(--na-color-glass-border);
  font-family: var(--na-font-mono);
  font-size: 10px;
  color: var(--na-color-on-surface-muted);
  flex-shrink: 0;
}

.editor-preview-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--na-color-surface-raised);
  border-bottom: 1px solid var(--na-color-glass-border);
  flex-shrink: 0;
}
.editor-preview-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #2EC27E;
  box-shadow: 0 0 8px #2EC27E;
}
.editor-preview-url {
  font-family: var(--na-font-mono);
  font-size: 11px;
  color: var(--na-color-on-surface-muted);
}
.editor-mini-btn {
  padding: 4px 9px;
  border-radius: 7px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface-muted);
  font-size: 11px;
  cursor: pointer;
}
.editor-mini-btn:hover { color: var(--na-color-on-surface); }

.editor-preview-wrap { flex: 1; min-height: 0; background: #fff; }
.editor-preview-frame { width: 100%; height: 100%; border: none; display: block; background: #fff; }

.editor-console {
  height: 180px;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--na-color-glass-border);
  background: var(--na-color-surface-deep, #0A0F1F);
  flex-shrink: 0;
}
.editor-console-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 12px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  color: var(--na-color-on-surface-muted);
  border-bottom: 1px solid var(--na-color-glass-border);
}
.editor-console-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
  font-family: var(--na-font-mono);
  font-size: 12px;
  line-height: 1.5;
}
.editor-console-line {
  padding: 2px 0;
  border-bottom: 1px solid rgba(143,168,255,0.06);
  word-break: break-word;
  white-space: pre-wrap;
}


/* ============================================================
   FLASHCARDS — flip card + SM-2 grade buttons
   ============================================================ */
.flashcard {
  perspective: 1600px;
  width: 100%;
  min-height: 320px;
  cursor: pointer;
  outline: none;
}
.flashcard:focus-visible .flashcard__inner { box-shadow: 0 0 0 3px rgba(91,91,255,0.5); border-radius: 18px; }
.flashcard__inner {
  position: relative;
  width: 100%;
  min-height: 320px;
  transition: transform 0.55s var(--app-ease, cubic-bezier(0.22,1,0.36,1));
  transform-style: preserve-3d;
}
.flashcard__inner.is-flipped { transform: rotateY(180deg); }
.flashcard__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 18px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px solid var(--na-color-glass-border);
}
.flashcard__face--front {
  background:
    radial-gradient(ellipse at 100% 0%, rgba(91,91,255,0.16), transparent 60%),
    var(--na-color-surface-raised);
}
.flashcard__face--back {
  transform: rotateY(180deg);
  background:
    radial-gradient(ellipse at 0% 100%, rgba(46,194,126,0.16), transparent 60%),
    var(--na-color-surface-raised);
}
.flashcard__label {
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--na-color-on-surface-muted);
  margin-bottom: 16px;
}
.flashcard__text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--na-color-on-surface);
}
.flashcard__hint {
  margin-top: 14px;
  font-size: 13px;
  color: var(--na-color-on-surface-muted);
}
.flashcard__tap {
  position: absolute;
  bottom: 16px;
  font-family: var(--na-font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--na-color-on-surface-muted);
  opacity: 0.7;
}
@media (prefers-reduced-motion: reduce) {
  .flashcard__inner { transition: none; }
}

.fc-grades {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 18px;
}
@media (max-width: 480px) { .fc-grades { grid-template-columns: repeat(2, 1fr); } }
.fc-grade {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 8px;
  border-radius: 12px;
  border: 1px solid var(--na-color-glass-border);
  background: var(--na-color-glass-tint);
  color: var(--na-color-on-surface);
  cursor: pointer;
  transition: transform var(--app-tx-fast) var(--app-ease), border-color var(--app-tx-fast);
}
.fc-grade:hover { transform: translateY(-2px); }
.fc-grade b { font-size: 14px; font-weight: 700; }
.fc-grade span { font-family: var(--na-font-mono); font-size: 10px; color: var(--na-color-on-surface-muted); }
.fc-grade--again { border-color: rgba(242,94,98,0.40); }
.fc-grade--again:hover { background: rgba(242,94,98,0.12); }
.fc-grade--hard { border-color: rgba(240,183,58,0.40); }
.fc-grade--hard:hover { background: rgba(240,183,58,0.12); }
.fc-grade--good { border-color: rgba(91,91,255,0.40); }
.fc-grade--good:hover { background: rgba(91,91,255,0.12); }
.fc-grade--easy { border-color: rgba(46,194,126,0.40); }
.fc-grade--easy:hover { background: rgba(46,194,126,0.12); }


/* ============================================================
   LANGUAGE TOGGLE BUTTON (topbar)
   ============================================================ */
.app-lang-btn { font-weight: 800; }
.app-lang-btn__txt {
  font-family: var(--na-font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--na-color-on-surface);
}
.app-lang-btn:hover .app-lang-btn__txt { color: var(--na-color-primary-300); }


/* ============================================================
   EEG STUDIO
   ============================================================ */
.eeg-card {
  border-radius: var(--app-radius);
  background: var(--na-color-surface-raised);
  border: 1px solid var(--na-color-glass-border);
  padding: 16px;
  margin-bottom: 16px;
}
.eeg-card__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.eeg-card__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--na-color-on-surface);
}
.eeg-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 900px) { .eeg-grid { grid-template-columns: 1fr 1fr; } }

#trace-canvas, #alpha-canvas {
  background: var(--na-color-surface-deep, #0A0F1F);
  border-radius: 10px;
}

.eeg-bands { display: flex; flex-direction: column; gap: 12px; }
.eeg-band__top {
  display: flex; justify-content: space-between;
  font-family: var(--na-font-mono); font-size: 11px;
  color: var(--na-color-on-surface-muted); margin-bottom: 4px;
}
.eeg-band__track {
  height: 8px; border-radius: 4px;
  background: var(--na-color-glass-border); overflow: hidden;
}
.eeg-band__track > span {
  display: block; height: 100%;
  border-radius: 4px;
  transition: width 0.25s var(--app-ease);
}

.eeg-meters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  align-items: center;
}
.eeg-meter { text-align: center; position: relative; }
.eeg-gauge { width: 90px; height: 90px; transform: rotate(-90deg); }
.eeg-gauge__bg { fill: none; stroke: var(--na-color-glass-border); stroke-width: 8; }
.eeg-gauge__fg {
  fill: none; stroke: #5B5BFF; stroke-width: 8; stroke-linecap: round;
  transition: stroke-dashoffset 0.3s var(--app-ease);
}
.eeg-gauge__fg--green { stroke: #2EC27E; }
.eeg-meter__val {
  position: absolute; top: 34px; left: 0; right: 0;
  font-size: 22px; font-weight: 800; letter-spacing: -0.04em;
}
.eeg-meter__big { font-size: 40px; font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.eeg-meter__lbl {
  font-family: var(--na-font-mono); font-size: 9px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--na-color-on-surface-muted); margin-top: 6px;
}
.eeg-meter__sub { font-family: var(--na-font-mono); font-size: 11px; color: var(--na-color-primary-300); margin-top: 4px; }


/* ============================================================
   BCI EXPERIMENTS (Motor Imagery + P300)
   ============================================================ */
.bci-note {
  padding: 12px 16px;
  border-radius: 10px;
  background: rgba(240, 183, 58, 0.08);
  border: 1px solid rgba(240, 183, 58, 0.28);
  font-size: 12px;
  line-height: 1.6;
  color: var(--na-color-on-surface-muted);
}
.bci-btn {
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border);
  color: var(--na-color-on-surface);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--app-tx-fast) var(--app-ease);
}
.bci-btn:hover:not(:disabled) { transform: translateY(-2px); }
.bci-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.bci-btn--primary { background: linear-gradient(135deg, #5B5BFF, #7A3FE4); border: none; color: #fff; }

.bci-hemis { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 14px; }
.bci-hemi__lbl { font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.08em; color: var(--na-color-on-surface-muted); margin-bottom: 6px; }
.bci-hemi__bar { height: 14px; border-radius: 7px; background: var(--na-color-glass-border); overflow: hidden; }
.bci-hemi__bar > span { display: block; height: 100%; width: 0%; background: linear-gradient(90deg, #5B5BFF, #2EC27E); border-radius: 7px; transition: width 0.18s linear; }
.bci-hemi__val { font-family: var(--na-font-mono); font-size: 18px; font-weight: 800; margin-top: 4px; }

/* P300 speller */
.p300-output { display: flex; flex-direction: column; align-items: center; gap: 6px; margin-bottom: 16px; }
.p300-spelled {
  font-family: var(--na-font-mono);
  font-size: 32px; font-weight: 800; letter-spacing: 0.1em;
  color: var(--na-color-primary-300);
  min-height: 40px;
  word-break: break-all;
  text-align: center;
}
.p300-matrix {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  max-width: 480px;
  margin: 0 auto;
}
.p300-cell {
  aspect-ratio: 1;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--na-color-surface-deep, #0A0F1F);
  border: 1px solid var(--na-color-glass-border);
  font-family: var(--na-font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--na-color-on-surface-muted);
  transition: none;
  user-select: none;
}
.p300-cell.is-flash {
  background: #fff;
  color: #0A0F1F;
  box-shadow: 0 0 16px rgba(255,255,255,0.7);
}
.p300-cell.is-detected {
  background: linear-gradient(135deg, #2EC27E, #22A66B);
  color: #fff;
  border-color: transparent;
  animation: na-peer-pop 300ms var(--app-ease-spring, ease);
}
@media (prefers-reduced-motion: reduce) {
  .p300-cell.is-detected { animation: none; }
}


/* ============================================================
   SSVEP tiles
   ============================================================ */
.ssvep-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}
@media (min-width: 600px) { .ssvep-grid { grid-template-columns: repeat(4, 1fr); } }
.ssvep-tile {
  aspect-ratio: 1;
  border-radius: 16px;
  background: var(--tile-color, #5B5BFF);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 6px;
  color: #fff;
  font-weight: 800;
  /* opacity is driven by JS flicker; keep transition off for precise timing */
  will-change: opacity;
  border: 3px solid transparent;
}
.ssvep-tile.is-selected { border-color: #fff; box-shadow: 0 0 24px var(--tile-color); }
.ssvep-tile__lbl { font-size: 18px; }
.ssvep-tile__freq { font-family: var(--na-font-mono); font-size: 12px; opacity: 0.85; }
@media (prefers-reduced-motion: reduce) {
  /* For photosensitive users, do not flicker — show steady tiles. */
  .ssvep-tile { opacity: 1 !important; }
}

/* ============================================================
   BRAIN-SYNC
   ============================================================ */
.bsync-score { padding: 14px 0; }
.bsync-score__num { font-size: 56px; font-weight: 800; letter-spacing: -0.04em; line-height: 1; color: var(--na-color-primary-300); }
.bsync-score__lbl { font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--na-color-on-surface-muted); margin-top: 6px; }
.bsync-people { display: flex; flex-direction: column; gap: 10px; }
.bsync-person { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; background: var(--na-color-glass-tint); border: 1px solid var(--na-color-glass-border); }
.bsync-person__dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.bsync-person__name { font-size: 13px; font-weight: 600; flex: 1; min-width: 0; }
.bsync-person__metric { font-family: var(--na-font-mono); font-size: 11px; color: var(--na-color-on-surface-muted); }
.bsync-person__bands { display: flex; width: 120px; height: 10px; border-radius: 5px; overflow: hidden; background: var(--na-color-glass-border); }
.bsync-person__bands > span { display: block; height: 100%; min-width: 1px; }


/* ============================================================
   EOG eye control
   ============================================================ */
.eog-typed {
  font-family: var(--na-font-mono);
  font-size: 24px; font-weight: 800; letter-spacing: 0.08em;
  color: var(--na-color-primary-300);
  min-height: 32px; margin-bottom: 12px; word-break: break-all;
}
.eog-keyboard {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px;
  max-width: 420px;
}
.eog-kb-key {
  aspect-ratio: 1; display: grid; place-items: center;
  border-radius: 8px; background: var(--na-color-surface-deep, #0A0F1F);
  border: 1px solid var(--na-color-glass-border);
  font-family: var(--na-font-mono); font-size: 16px; font-weight: 700;
  color: var(--na-color-on-surface-muted);
}
.eog-kb-key.is-cursor { border-color: var(--na-color-primary-300); background: rgba(91,91,255,0.18); color: #fff; box-shadow: 0 0 12px rgba(91,91,255,0.4); }
.eog-kb-key.is-picked { background: linear-gradient(135deg,#2EC27E,#22A66B); color: #fff; }
.eog-dpad { display: flex; flex-direction: column; align-items: center; gap: 8px; margin: 14px 0; }
.eog-dpad__mid { display: flex; gap: 8px; align-items: center; }
.eog-key {
  padding: 12px 16px; border-radius: 10px; background: var(--na-color-glass-tint);
  border: 1px solid var(--na-color-glass-border); color: var(--na-color-on-surface);
  font-size: 16px; font-weight: 700; cursor: pointer;
}
.eog-key:hover { background: var(--na-color-surface-raised); }
.eog-key--select { background: linear-gradient(135deg,#5B5BFF,#7A3FE4); border: none; color: #fff; }

/* ============================================================
   BIOSIGNAL KNOWLEDGE BASE
   ============================================================ */
.bio-hero {
  border-radius: var(--app-radius-lg);
  padding: 22px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(122,63,228,0.25), transparent 60%),
    radial-gradient(ellipse at 0% 100%, rgba(91,91,255,0.20), transparent 60%),
    var(--na-color-surface-raised);
  border: 1px solid rgba(143,168,255,0.25);
  margin-bottom: 18px;
}
.bio-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.bio-tab {
  padding: 10px 16px; border-radius: 999px; cursor: pointer;
  background: var(--na-color-glass-tint); border: 1px solid var(--na-color-glass-border);
  font-size: 13px; font-weight: 700; color: var(--na-color-on-surface-muted);
  display: inline-flex; align-items: center; gap: 7px;
}
.bio-tab[aria-selected="true"] { background: linear-gradient(135deg,#5B5BFF,#7A3FE4); color: #fff; border-color: transparent; }
.bio-section { margin-bottom: 22px; }
.bio-section__h {
  font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--na-color-primary-300); margin-bottom: 10px;
  display: flex; align-items: center; gap: 8px;
}
.bio-feat-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.bio-feat-table th, .bio-feat-table td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--na-color-glass-border); vertical-align: top; }
.bio-feat-table th { font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--na-color-on-surface-muted); }
.bio-feat-table td code { font-family: var(--na-font-mono); font-size: 11px; color: var(--na-color-primary-300); }
.bio-chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.bio-pill { font-size: 11px; padding: 4px 10px; border-radius: 999px; background: var(--na-color-glass-tint); border: 1px solid var(--na-color-glass-border); color: var(--na-color-on-surface-muted); }
.bio-ds {
  display: block; padding: 12px 14px; border-radius: 10px; margin-bottom: 8px;
  background: var(--na-color-surface-raised); border: 1px solid var(--na-color-glass-border);
  text-decoration: none; color: inherit;
}
.bio-ds:hover { border-color: rgba(143,168,255,0.3); }
.bio-ds__name { font-size: 13px; font-weight: 700; color: var(--na-color-on-surface); }
.bio-ds__meta { font-size: 11px; color: var(--na-color-on-surface-muted); margin-top: 3px; }
.bio-ds__lic { font-family: var(--na-font-mono); font-size: 9px; letter-spacing: 0.08em; color: #2EC27E; }
.bio-path { display: flex; flex-direction: column; gap: 0; }
.bio-path__step { display: flex; gap: 12px; padding-bottom: 14px; position: relative; }
.bio-path__step:not(:last-child)::before { content: ""; position: absolute; left: 13px; top: 28px; bottom: -2px; width: 2px; background: var(--na-color-glass-border); }
.bio-path__dot { width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0; display: grid; place-items: center; font-size: 12px; font-weight: 800; background: linear-gradient(135deg,#5B5BFF,#7A3FE4); color: #fff; z-index: 1; }
.bio-path__body { flex: 1; }
.bio-path__lvl { font-family: var(--na-font-mono); font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--na-color-primary-300); }
.bio-path__title { font-size: 14px; font-weight: 700; margin: 2px 0 4px; }
.bio-path__desc { font-size: 12px; color: var(--na-color-on-surface-muted); line-height: 1.5; }
.bio-code {
  margin: 8px 0; padding: 12px 14px; border-radius: 10px; overflow-x: auto;
  background: var(--na-color-surface-deep, #0A0F1F); border: 1px solid var(--na-color-glass-border);
  font-family: var(--na-font-mono); font-size: 12px; line-height: 1.55; color: var(--na-color-on-surface);
}


/* ============================================================
   SLEEP / HRV / MEDITATION LABS
   ============================================================ */
.sleep-stats { display: flex; flex-direction: column; gap: 6px; }
.sleep-stat-row { display: grid; grid-template-columns: 1fr auto auto; gap: 10px; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--na-color-glass-border); font-size: 13px; }

.hrv-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.hrv-metric { display: flex; justify-content: space-between; padding: 8px 10px; border-radius: 8px; background: var(--na-color-glass-tint); border: 1px solid var(--na-color-glass-border); font-size: 12px; }
.hrv-metric b { font-family: var(--na-font-mono); color: var(--na-color-on-surface); }

.med-stage { text-align: center; padding: 24px 0 8px; }
.med-orb {
  width: 180px; height: 180px; border-radius: 50%; margin: 0 auto;
  background: radial-gradient(circle, #5B5BFF, #7A3FE4);
  display: grid; place-items: center;
  transition: transform 3.5s ease-in-out, background 1s ease;
  box-shadow: 0 0 60px rgba(91,91,255,0.4);
}
.med-orb__inner { text-align: center; color: #fff; }
.med-calm { font-size: 44px; font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.med-calm__lbl { font-family: var(--na-font-mono); font-size: 10px; letter-spacing: 0.18em; opacity: 0.85; }
.med-breath { font-size: 18px; font-weight: 600; margin-top: 22px; color: var(--na-color-on-surface); }
.med-timer { font-family: var(--na-font-mono); font-size: 13px; color: var(--na-color-on-surface-muted); margin-top: 6px; }
.med-session { display: flex; flex-direction: column; gap: 8px; }
@media (prefers-reduced-motion: reduce) { .med-orb { transition: background 1s ease; } }


/* ============================================================
   LAB SESSION GATING
   ============================================================ */
.cal-session {
  margin-bottom: 14px;
  border-radius: 14px;
  border: 1px solid var(--na-color-glass-border);
  overflow: hidden;
  background: var(--na-color-surface-raised);
}
.cal-session__head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  background: var(--na-color-glass-tint);
  border-bottom: 1px solid var(--na-color-glass-border);
}
.cal-session__icon {
  width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; font-size: 12px; font-weight: 800; flex-shrink: 0;
  background: var(--na-color-glass-border); color: var(--na-color-on-surface-muted);
}
.cal-session.is-active .cal-session__icon { background: linear-gradient(135deg,#5B5BFF,#7A3FE4); color: #fff; }
.cal-session.is-complete .cal-session__icon { background: linear-gradient(135deg,#2EC27E,#22A66B); color: #fff; }
.cal-session__title { flex: 1; font-size: 13px; font-weight: 700; letter-spacing: -0.01em; }
.cal-session__count { font-family: var(--na-font-mono); font-size: 11px; color: var(--na-color-on-surface-muted); }
.cal-session.is-locked { opacity: 0.7; }
.cal-session.is-locked .cal-session__title { color: var(--na-color-on-surface-muted); }
.cal-session__steps { list-style: none; margin: 0; padding: 10px 14px; display: flex; flex-direction: column; gap: 10px; }

.cal-step.is-locked { opacity: 0.55; pointer-events: none; }
.cal-step__locked-note {
  font-size: 12px; color: var(--na-color-on-surface-muted);
  padding: 8px 10px; border-radius: 8px;
  background: rgba(240,183,58,0.08); border: 1px solid rgba(240,183,58,0.25);
  margin-top: 8px;
}


/* ============================================================
   PROJECT PROGRAMS (PBL) — detail + pricing
   ============================================================ */
.prog-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 860px) { .prog-grid { grid-template-columns: 1.4fr 1fr; } }
.prog-opt { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--na-color-glass-border); font-size: 13px; }
.prog-opt input[type="number"] { width: 70px; padding: 6px 8px; border-radius: 8px; background: var(--na-color-glass-tint); border: 1px solid var(--na-color-glass-border); color: var(--na-color-on-surface); font-family: var(--na-font-mono); }
.prog-opt--check { justify-content: flex-start; cursor: pointer; }
.prog-opt--check input { width: 18px; height: 18px; accent-color: #5B5BFF; }
.prog-total { margin-top: 14px; padding-top: 12px; border-top: 2px solid var(--na-color-glass-border); }
.prog-total__row { display: flex; justify-content: space-between; padding: 5px 0; font-size: 13px; color: var(--na-color-on-surface-muted); }
.prog-total__row b { font-family: var(--na-font-mono); color: var(--na-color-on-surface); }
.prog-total__row--fee { font-size: 12px; }
.prog-total__row--grand { font-size: 16px; font-weight: 800; color: var(--na-color-on-surface); padding-top: 8px; border-top: 1px solid var(--na-color-glass-border); margin-top: 4px; }
.prog-total__row--grand b { color: var(--na-color-primary-300); font-size: 20px; }