/* Mobile layout overrides — desktop styles remain unchanged above 720px. */
@media (max-width:720px), (max-device-width:720px) {
  html { scrollbar-gutter:auto; }
  body,.course-page,.lesson-page { min-width:0!important; width:100%; overflow-x:hidden; }

  /* Shared navigation */
  .nav { position:sticky; top:0; z-index:1100; height:auto; display:block; padding:7px 0 0; background:rgba(255,251,244,.97); }
  .brand { display:block; width:max-content; margin:0 auto 5px; }
  .brand-image { width:126px; height:38px; }
  .nav nav { width:100%; height:42px; margin:0; padding:0 10px; display:flex; justify-content:flex-start; gap:2px; overflow-x:auto; overflow-y:hidden; scrollbar-width:none; -webkit-overflow-scrolling:touch; }
  .nav nav::-webkit-scrollbar { display:none; }
  .nav nav a,.nav nav a:not(:last-of-type) { flex:0 0 auto; padding:11px 12px 10px; font-size:13px; letter-spacing:.08em; }
  .nav nav a:not(:last-of-type)::after,.nav-indicator { display:none; }
  footer,.site-footer { min-height:66px; height:auto; padding:14px 5%; flex-wrap:wrap; justify-content:center; gap:8px; }
  footer i,.site-footer i { height:26px; margin:0 6px; }
  .footer-logo { max-width:39%; height:28px; object-fit:contain; }
  .icp-record { width:100%; margin:7px 0 0; text-align:center; font-size:10px; }

  /* Opening and homepage */
  .launch-screen { padding-bottom:12vh; }
  .launch-background { object-fit:contain!important; object-position:center; background:#120c07; }
  .launch-screen.is-auto-sequence .launch-background,
  .launch-screen.is-playing-whole .launch-background,
  .launch-screen.is-playing-later .launch-background { object-fit:contain; background:#120c07; }
  .launch-button { min-width:160px; font-size:14px; }
  .resource-loader::before { inset:12px; }
  .loader-emblem { width:72px; height:72px; }
  .hero { height:510px; }
  .hero-copy { padding:24px 18px 0; }
  .hero-copy h1 { font-size:28px; line-height:1.45; letter-spacing:.08em; }
  .hero-copy p { gap:8px; padding:0; font-size:13px; line-height:1.65; }
  .subtitle-line { width:28px; }
  .model-stage { top:150px; height:253px; overflow:hidden; }
  .model-stage model-viewer { transform:none; }
  .facts { grid-template-columns:repeat(2,1fr); height:auto; padding:18px 14px; gap:8px; }
  .facts article { min-width:0; padding:13px 8px; }
  .facts article:not(:last-child)::after { display:none; }
  .facts strong { font-size:12px; }
  .cards { grid-template-columns:repeat(2,1fr); gap:10px; padding:26px 14px 34px; }
  .cards a { min-height:138px; }
  .card-copy b { font-size:18px; }
  .card-copy small { font-size:10px; }

  /* Shared section typography */
  .overview-kicker { font-size:12px; }
  .overview-kicker span { width:34px; height:34px; margin-right:10px; }
  .section-heading h2 { font-size:27px; }

  /* Overview */
  .overview-hero { height:auto; min-height:0; grid-template-columns:1fr; gap:34px; padding:38px 20px 56px; }
  .overview-hero::after { top:30px; right:0; font-size:100px; }
  .overview-hero h1.overview-quote-title { margin-top:22px; font-size:22px; line-height:1.65; }
  .overview-lead { font-size:13px; }
  .overview-lead br { display:none; }
  .hero-provenance-notes { font-size:15px; }
  .hero-provenance-notes li { min-height:54px; padding-left:120px; white-space:normal; }
  .hero-provenance-notes b { font-size:15px; }
  .hero-dimensions { padding:12px 18px 8px 0; }
  .hero-spec-title { display:block; }
  .hero-spec-title strong { display:block; margin-top:7px; font-size:14px; }
  .hero-visual-comparison { grid-template-columns:44px minmax(0,1fr); gap:12px; }
  .hero-a4-paper { width:32px; }
  .hero-scroll-perspective { transform:rotateX(4deg) rotateY(-4deg) rotateZ(1deg); }
  .hero-height-line { right:-27px; }

  /* Author */
  .author-onepage { height:auto; min-height:0; display:block; }
  .author-onepage-portrait { height:330px; min-height:0; }
  .author-onepage-portrait img { transform:scale(1.03); object-position:center 34%; }
  .author-onepage-portrait>span { font-size:68px; }
  .author-dashboard { height:auto; padding:28px 18px 42px; gap:30px; }
  .author-dashboard-head { grid-template-columns:1fr; gap:14px; }
  .author-dashboard-head h1 { font-size:36px; }
  .author-dashboard-head h1 em { display:block; margin-top:8px; font-size:16px; }
  .author-compact-section { grid-template-columns:1fr; gap:12px; }
  .compact-timeline { grid-template-columns:1fr; gap:0; padding-left:20px; }
  .compact-timeline::before { left:3px; right:auto; top:10px; bottom:10px; border-top:0; border-left:1px solid #c6a576; }
  .compact-timeline article { padding:8px 0 8px 18px; text-align:left; }
  .compact-timeline article::before { left:3px; top:17px; transform:translateX(-50%); }
  .compact-timeline time,.compact-timeline b,.compact-timeline small { display:inline; margin:0 8px 0 0; white-space:normal; }
  .compact-achievements { grid-template-columns:repeat(2,1fr); gap:9px; }
  .compact-achievements article { padding:14px 12px; }
  .compact-achievements h3,.compact-achievements p { white-space:normal; }
  .compact-voices { margin:0; grid-template-columns:1fr; gap:8px; }

  /* Creation */
  .creation-onepage { height:auto; min-height:0; padding:28px 14px 42px; }
  .creation-onepage-shell { height:auto; }
  .creation-onepage-grid { grid-template-columns:1fr; gap:16px; }
  .creation-background-panel,.creation-features-panel { padding:18px 14px; }
  .creation-story-list { height:auto; grid-template-rows:none; }
  .creation-story-list article { min-height:112px; }
  .creation-feature-grid { height:auto; grid-template-columns:1fr; grid-template-rows:none; }
  .creation-feature-card { min-height:126px; grid-template-columns:44% 56%; }
  .creation-feature-card .feature-chart { height:100px; }
  .creation-feature-card.feature-stroke-card { grid-template-columns:200px minmax(0,1fr); }
  .creation-feature-card .manuscript-stroke { width:200px; height:200px; }
  .creation-feature-card.feature-structure-card { grid-template-columns:200px minmax(0,1fr); }
  .creation-feature-card .manuscript-structure { width:200px; height:200px; }
  .creation-feature-card.feature-rhythm-card { grid-template-columns:200px minmax(0,1fr); }
  .creation-feature-card .manuscript-rhythm { width:200px; height:200px; }
  .creation-feature-card.feature-ink-card { grid-template-columns:200px minmax(0,1fr); }
  .creation-feature-card .manuscript-ink { width:200px; height:200px; }

  /* Circulation */
  .circulation-onepage { height:auto; min-height:0; padding:28px 14px 44px; }
  .circulation-onepage-shell { height:auto; }
  .circulation-onepage-grid { grid-template-columns:1fr; gap:16px; }
  .compact-provenance,.seal-panorama-panel { padding:18px 14px; }
  .compact-provenance-line { height:auto; gap:8px; }
  .compact-provenance-line article { min-height:96px; }
  .seal-panorama-panel { overflow:visible; }
  .seal-panorama-panel > header { align-items:flex-start; gap:12px; }
  .seal-panorama-panel > header span { text-align:right; }
  .seal-metrics { grid-template-columns:repeat(2,1fr); }
  .seal-metrics span { font-size:12px; }
  .seal-lineage { grid-template-columns:1fr; gap:8px; }
  .seal-lineage::before { display:none; }
  .seal-lineage article { min-height:104px; display:grid; grid-template-columns:52px minmax(0,1fr); align-items:center; gap:16px; padding:15px 16px; text-align:left; }
  .seal-lineage i { position:relative; left:auto; top:auto; width:46px; height:46px; transform:rotate(-3deg); }
  .seal-lineage article > div { min-width:0; transform:none; }
  .seal-lineage b { font-size:15px; }
  .seal-lineage span,.seal-lineage small { font-size:12px; }
  .seal-lineage em { margin-top:6px; font-size:10px; }
  .seal-evidence-row { grid-template-columns:1fr; }
  .seal-evidence-row p { font-size:12px; }
  .seal-story-dialog { width:calc(100vw - 28px); max-height:calc(100dvh - 28px); padding:28px 20px 26px; }
  .seal-dialog-heading { gap:15px; padding-right:25px; }
  .seal-dialog-heading>i { width:52px; height:52px; font-size:23px; }
  .seal-dialog-heading h2 { font-size:21px; }
  .seal-dialog-lead { margin:20px 0; font-size:14px; }
  .seal-dialog-details>div { grid-template-columns:76px 1fr; gap:10px; padding:12px; }

  /* Interpretation */
  .interpretation-main { min-height:0; padding:26px 14px 50px; background-attachment:scroll; }
  .scroll-selector { margin-inline:0; overflow:visible; }
  .scroll-overview { display:flex; justify-content:center; overflow:hidden; }
  .scroll-composite { display:flex; width:auto; height:calc((100vw - 30px)*.1785); min-height:0; max-height:none; direction:ltr; overflow:hidden; }
  .scroll-segment { width:auto; height:calc((100vw - 30px)*.1785)!important; min-height:0; max-height:none; }
  .scroll-segment img { width:auto!important; max-width:none; height:calc((100vw - 30px)*.1785)!important; min-height:0; max-height:none; object-fit:contain; }
  .scroll-segment b { bottom:3px; width:24px; height:19px; font-size:8px; }
  .reading-workspace { grid-template-columns:1fr; gap:16px; }
  .facsimile-panel,.translation-panel { min-height:430px; }
  .silk-sheet { min-height:360px; }
  .transcription-text { font-size:14px; }

  /* Information */
  .info-section { min-height:0; padding:38px 16px 50px; }
  .info-section>.section-heading h2 { font-size:clamp(17px,5.1vw,21px); line-height:1.5; letter-spacing:.04em; white-space:nowrap; }
  .info-section>.section-heading p { font-size:15px; }
  .info-card { padding:0; }
  .info-seal { position:static; margin:0 auto 20px; }
  .publication-data dd { font-size:14px; }

  /* Course catalogue */
  .course-section-kicker { padding:24px 18px 0; }
  .course-about { grid-template-columns:1fr; gap:28px; padding:32px 18px 42px; }
  .teacher-profile { grid-template-columns:112px minmax(0,1fr); gap:18px; }
  .teacher-profile h2 { font-size:25px; }
  .teacher-copy p { font-size:12px; line-height:1.8; }
  .feature-list { grid-template-columns:1fr; gap:9px; }
  .feature-list article { min-height:0; padding:25px 20px 20px; }
  .course-catalog { padding:38px 14px 60px; }
  .course-catalog>header { align-items:flex-start; }
  .course-catalog>header h2 { font-size:28px; }
  .catalog-layout { display:block; margin-top:20px; }
  .chapter-tabs { position:static; display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:6px; margin-bottom:12px; padding:6px; overflow:visible; }
  .chapter-tabs button { width:100%; min-width:0; min-height:48px; padding:8px 6px; border-left:0; border-bottom:3px solid transparent; font-size:11px; }
  .chapter-tabs button.active { border-left-color:transparent; border-bottom-color:#d8b47d; }
  .unit-summary { display:block; min-height:0; padding:18px; }
  .unit-summary h3 { font-size:18px; }
  .unit-summary>p { margin-top:10px; text-align:left; font-size:11px; }
  .lesson-list>a,.lesson-list>div { min-height:76px; grid-template-columns:46px minmax(0,1fr) 34px; padding:0 12px; }
  .lesson-order { display:none; }
  .lesson-title b { font-size:13px; }
  .play-mark { width:28px; height:28px; }

  /* Lesson player */
  .lesson-header { height:auto; min-height:68px; grid-template-columns:auto 1fr auto; gap:8px; padding:10px 12px; }
  .lesson-header small { display:none; }
  .lesson-header b { font-size:11px; letter-spacing:0; }
  .back-link { font-size:0; }
  .back-link::before { content:"←"; font-size:22px; }
  .share-button { padding:8px 10px; font-size:11px; }
  .lesson-main { padding:14px 0 40px; }
  .video-shell { aspect-ratio:16/9; }
  .video-controls { height:48px; gap:5px; padding:10px 7px; }
  .video-controls .volume,.video-controls #volumeButton,.video-controls .node,.video-controls #currentTime { display:none; }
  .video-controls select { font-size:10px; }
  .center-play { width:54px; height:54px; }
  .share-dialog { width:calc(100vw - 28px); padding:32px 20px; }
}

@media (max-width:390px), (max-device-width:390px) {
  .cards { grid-template-columns:1fr; }
  .facts { grid-template-columns:1fr 1fr; }
  .teacher-profile { grid-template-columns:96px minmax(0,1fr); }
  .compact-achievements { grid-template-columns:1fr; }
}