/* Dedicated phone/tablet layout. Loaded after the desktop experience layer. */

.mobile-section-heading,
.canvas-touch-toggle {
  display: none;
}

@media (max-width: 900px) {
  :root {
    --header-height: 60px;
  }

  html {
    scroll-padding-top: calc(var(--header-height) + 12px);
  }

  body {
    overscroll-behavior-y: auto;
  }

  body:has(.chapter-menu[open]) {
    overflow: hidden;
  }

  .site-header {
    min-height: var(--header-height);
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    padding: 8px 10px;
  }

  .site-brand {
    min-width: 0;
    max-width: none;
    overflow: hidden;
    font-size: clamp(0.8rem, 3.3vw, 0.94rem);
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .header-actions {
    min-width: 0;
    gap: 6px;
  }

  .chapter-menu summary,
  .audio-btn {
    min-width: 44px;
    min-height: 44px;
  }

  .chapter-menu nav {
    position: fixed;
    inset: calc(var(--header-height) + 8px) 8px max(8px, env(safe-area-inset-bottom));
    width: auto;
    max-height: none;
    padding: 8px;
    border-radius: 18px;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

  .chapter-list {
    gap: 4px;
  }

  .chapter-list a {
    min-height: 52px;
    align-items: center;
    padding: 12px 14px;
  }



  .hero {
    min-height: 100svh;
    padding: calc(var(--header-height) + 52px) 18px 72px;
  }

  .hero-title {
    font-size: clamp(3.1rem, 16vw, 5rem);
  }

  .hero-actions {
    width: min(100%, 360px);
  }

  .hero-primary-action,
  .hero-secondary-action {
    width: 100%;
    min-height: 52px;
  }

  .section {
    display: block;
    min-height: 0;
    border-bottom-color: rgba(255, 255, 255, 0.09);
  }

  .mobile-section-heading {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 14px 16px;
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(15, 21, 32, 0.98), rgba(12, 17, 27, 0.98));
  }

  .mobile-section-heading-copy {
    min-width: 0;
    display: grid;
    gap: 3px;
  }

  .mobile-section-number {
    color: var(--accent);
    font: 500 0.68rem var(--font-mono);
    letter-spacing: 0.14em;
  }

  .mobile-section-title {
    overflow: hidden;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.25;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .viz-pane {
    position: relative;
    top: auto;
    height: clamp(400px, 58svh, 560px);
    min-height: 400px;
    border-bottom: 1px solid var(--border);
  }

  .viz-pane canvas {
    touch-action: pan-y pinch-zoom;
  }

  .viz-pane.touch-interaction-active {
    outline: 2px solid rgba(79, 156, 247, 0.55);
    outline-offset: -2px;
  }

  .viz-pane.touch-interaction-active canvas {
    touch-action: none;
  }

  .canvas-touch-toggle {
    flex: none;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(8, 11, 18, 0.82);
    color: var(--text-secondary);
    font: 600 0.76rem var(--font-body);
  }

  .canvas-touch-toggle[aria-pressed='true'] {
    border-color: var(--accent-dim);
    background: var(--accent-glow);
    color: var(--accent);
  }

  .section > .viz-controls.mobile-control-dock {
    position: relative;
    inset: auto;
    z-index: 2;
    width: 100%;
    max-height: none;
    display: flex;
    align-items: stretch;
    gap: 10px;
    overflow: visible;
    padding: 12px 14px calc(14px + env(safe-area-inset-bottom));
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(15, 21, 32, 0.99), rgba(10, 14, 22, 0.99));
  }

  .mobile-control-dock .viz-btn,
  .mobile-control-dock .switch-container {
    flex: 1 1 140px;
    min-height: 50px;
    justify-content: center;
    padding: 12px 14px;
    font-size: 0.84rem;
    white-space: normal;
    line-height: 1.25;
    text-align: center;
  }

  .mobile-control-dock .slider-container {
    flex: 1 1 100%;
    min-width: 0;
    min-height: 64px;
    display: grid;
    grid-template-columns: minmax(92px, auto) minmax(0, 1fr) auto;
    gap: 12px;
    padding: 10px 12px;
  }

  .mobile-control-dock .slider-label {
    max-width: none;
    white-space: normal;
    line-height: 1.25;
  }

  .mobile-control-dock input[type='range'] {
    width: 100%;
    min-width: 0;
    min-height: 44px;
  }

  .mobile-control-dock input[type='range']::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
    margin-top: -9.5px;
  }

  .mobile-control-dock input[type='range']::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }

  .viz-hint {
    display: block;
    top: 12px;
    right: 12px;
    max-width: min(56%, 250px);
    padding: 6px 9px;
    font-size: 0.68rem;
    line-height: 1.35;
  }

  .viz-stats {
    top: 12px;
    left: 12px;
    right: auto;
    max-width: min(62%, 250px);
    font-size: 0.65rem;
  }

  .text-pane {
    min-height: auto;
    padding: 38px 18px 72px;
    border-top: 0;
    border-left: 0;
  }

  .text-content {
    max-width: 680px;
    margin-inline: auto;
  }

  .section-title {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .section-subtitle {
    margin-bottom: 26px;
  }

  .text-body {
    font-size: 1rem;
    line-height: 1.75;
  }
}

@media (max-width: 480px) {
  .site-brand {
    max-width: 112px;
  }

  .chapter-menu summary {
    padding-inline: 10px;
  }

  .mobile-section-heading {
    min-height: 68px;
    padding-inline: 14px;
  }

  .viz-pane {
    height: clamp(380px, 55svh, 500px);
    min-height: 380px;
  }

  .viz-hint {
    max-width: 58%;
  }

  .section > .viz-controls.mobile-control-dock {
    padding-inline: 10px;
  }

  .mobile-control-dock .viz-btn,
  .mobile-control-dock .switch-container {
    flex-basis: 120px;
  }
}