/* Phone layouts: navigation, readable cards, and a player that fits its container. */
.mobile-menu{display:none}
.mobile-topic-links{display:none}
.player-shell{width:100%}
.video-description-fold summary{display:none}
.list-subtitle{font-size:.68em;color:var(--muted);font-weight:600;margin-left:8px}
@media(max-width:640px){
  html{scroll-padding-top:76px}
  .mobile-menu{display:block;position:relative;font-size:14px;flex:none}
  .mobile-menu summary{list-style:none;cursor:pointer;min-width:64px;min-height:44px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:999px;font-weight:750}
  .mobile-menu summary::-webkit-details-marker{display:none}
  .mobile-menu[open] summary{background:var(--ink);color:var(--paper)}
  .mobile-menu nav{position:absolute;right:0;top:52px;min-width:190px;padding:8px;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 30px #10131320;z-index:50}
  .mobile-menu nav a{display:flex;align-items:center;min-height:48px;padding:10px 14px;font-size:14px;color:var(--ink)}
  .mobile-menu nav a:hover,.mobile-menu nav a:focus-visible{background:#e5e8dc;border-radius:8px}
  .nav,.nav-inner{overflow:visible}
  .nav-inner{height:64px;min-height:64px;gap:12px}
  .nav-inner>.nav-cta,.nav-inner>.share,.nav-inner>.home,.nav-inner>.nav-links{display:none}
  .brand{font-size:15px;gap:8px}
  .brand small{font-size:8px}
  .nav-inner>.brand{min-height:44px}
  a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #6b8f00;outline-offset:3px}

  /* Home: get to topics before a decorative product mockup. */
  .hero-grid{padding-block:30px 32px;min-height:0}
  .hero-visual{display:none}
  .hero h1{font-size:clamp(36px,10.6vw,48px);line-height:1.12;margin:18px 0;letter-spacing:-.04em}
  .hero-copy>p{font-size:14px;line-height:1.75;margin-bottom:22px}
  .hero-actions{display:block}
  .hero-actions>.button{min-height:48px;width:100%;font-size:14px}
  .hero-actions>[data-share],.hero-note{display:none}
  .section,.how{padding-block:36px}
  .section-head{margin-bottom:22px}
  .section-head h2{font-size:clamp(26px,7.5vw,34px);line-height:1.22;letter-spacing:-.045em;margin-top:12px}
  .section-head p{font-size:14px;line-height:1.75;margin-top:14px}
  .searchbar{margin-top:22px;padding:6px 7px 6px 12px;gap:8px}
  .searchbar input{font-size:16px;min-height:44px}
  .searchbar input::placeholder{font-size:13px}
  .searchbar .button{min-height:44px;font-size:12px;padding:10px 12px}
  .chips{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
  .mobile-topic-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  .mobile-topic-links a{display:flex;justify-content:space-between;align-items:center;min-height:48px;padding:12px 14px;background:white;border:1px solid var(--line);border-radius:12px;font-size:14px;font-weight:700}
  #collections .chips{display:none}
  .chip{min-height:44px;padding:9px 4px;font-size:12px;white-space:nowrap}
  .collection-layout{margin-top:24px;gap:12px}
  .feature-card{min-height:265px;padding:20px}
  .feature-bottom h3{font-size:29px;line-height:1.15}
  .feature-bottom p{font-size:12px}
  .mini-feature{min-height:160px;padding:16px}
  .mini-feature h3{font-size:19px;line-height:1.25}
  .discover-grid{gap:18px}
  .card-body{padding:16px}
  .card-body h3{font-size:17px;line-height:1.45}
  .card-body p{font-size:13px;line-height:1.7}
  .card-meta,.card-foot{font-size:11px}
  .demo-tag{font-size:10px}
  .filter-note{font-size:12px;line-height:1.7}
  .how-step h3{font-size:18px;line-height:1.4}
  .how-step p{font-size:14px;line-height:1.8}
  .quote blockquote{font-size:26px;line-height:1.5}
  .cta{padding-block:36px}
  .cta h2{font-size:32px;line-height:1.2}
  .cta-actions .button{min-height:44px;font-size:13px}
  .footer-links a{display:inline-flex;min-height:44px;align-items:center;font-size:12px}

  /* Category: compact header and a single column of full-width video cards. */
  .top{padding:10px 0 0}
  .back{min-height:44px;align-items:center;display:inline-flex;font-size:13px}
  .top .hero{display:block;min-height:0;margin-top:4px;padding:18px 16px;border-radius:16px}
  .top .hero:before{display:none}
  .top .hero-copy{max-width:none}
  .top .hero .eyebrow{display:none}
  .top .hero h1{font-size:27px;line-height:1.25;margin:0 55px 0 0;letter-spacing:-.04em}
  .top .hero p{display:none}
  .top .hero-count{position:absolute;top:20px;right:16px;width:auto;height:auto;margin:0;padding:7px 9px;border-radius:8px;transform:none}
  .top .hero-count strong{font:750 18px/1.1 var(--sans)}
  .top .hero-count span{display:none}
  .category-switch{flex-wrap:nowrap;overflow-x:auto;gap:8px;padding:14px 1px 6px;scroll-padding-inline:4px;scrollbar-width:none}
  .category-switch::-webkit-scrollbar{display:none}
  .cat-pill{flex:none;display:flex;align-items:center;justify-content:center;min-height:44px;font-size:13px;padding:10px 14px}
  .main{padding-block:18px 40px}
  .main .section-head h2{font-size:25px;line-height:1.3}
  .main .section-head .eyebrow{display:none}
  .list-subtitle{display:block;font-size:13px;margin:5px 0 0;letter-spacing:0}
  .main .section-head p{font-size:13px;line-height:1.7}
  .tools{margin:18px 0 12px;gap:10px}
  .search{padding:6px 12px}
  .search input{font-size:16px;min-height:44px}
  .search input::placeholder{font-size:13px}
  .sort-label{display:none}
  .data-note{font-size:12px;line-height:1.65;padding:12px;margin-bottom:20px}
  .results{border:0;display:grid;gap:24px}
  .video-row{position:relative;display:block;padding:0;min-height:0;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
  .video-row .rank{position:absolute;left:10px;top:10px;z-index:1;background:var(--ink);color:var(--lime);border-radius:7px;padding:5px 9px;font:750 14px/1.2 var(--sans)}
  .video-row .thumb{display:block;width:100%;height:auto;aspect-ratio:16/9;border-radius:0}
  .row-copy{padding:14px 14px 0}
  .row-kicker{display:none}
  .row-copy h3{font-size:17px;line-height:1.45;letter-spacing:-.025em}
  .row-copy h3 a{display:block;min-height:44px}
  .row-copy p{display:none}
  .row-copy .channel{font-size:13px;min-height:44px;margin:6px 0 0;gap:8px;overflow-wrap:anywhere}
  .row-copy .avatar{width:24px;height:24px;font-size:10px;flex:none}
  .row-stats{display:flex;flex-wrap:wrap;grid-column:auto;align-items:center;gap:8px 16px;border:0;border-top:1px solid var(--line);padding:10px 14px;margin:4px 0 0}
  .row-stats .stat-block{display:grid;gap:4px}
  .row-stats .stat-label{font-size:11px}
  .row-stats .stat-value{font-size:12px;font-weight:700}
  .watch{display:flex;align-items:center;justify-content:center;min-height:44px;min-width:88px;margin-left:auto;font-size:13px;border-radius:8px;background:var(--ink);color:white;padding:10px}
  .page-summary{font-size:13px}
  .footer p{font-size:12px;line-height:1.75}
  .footer a{display:inline-flex;min-height:44px;align-items:center;font-size:13px}

  /* Detail: full-width playback, readable metadata, and expandable description. */
  main.wrap{width:calc(100% - 32px)}
  main.wrap>.back{margin:6px 0 10px}
  .layout{gap:24px;padding-bottom:36px}
  .layout>.main{padding:0}
  .player-shell{width:calc(100% + 32px);margin-inline:-16px;border-radius:0;box-shadow:none;min-height:200px}
  .title{font-size:22px;line-height:1.4;letter-spacing:-.035em;margin:10px 0 16px;word-break:keep-all;overflow-wrap:anywhere}
  .main>.eyebrow{font-size:11px;margin-top:20px}
  .meta{gap:16px;padding-bottom:18px}
  .meta .channel{font-size:15px;min-height:44px}
  .meta .channel a{display:inline-flex;align-items:center;min-height:44px}
  .channel small{font-size:11px;line-height:1.5}
  .stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;width:100%;font-size:12px}
  .stats b{font-size:13px;line-height:1.5;margin-top:5px}
  .description{padding:16px;margin-top:18px}
  .description h2{font-size:16px;line-height:1.5}
  .description p{font-size:14px;line-height:1.9}
  .video-description-fold summary{display:flex;align-items:center;min-height:44px;cursor:pointer;font-size:14px;font-weight:700;color:var(--ink)}
  .video-description-fold[open] summary{margin-bottom:10px}
  .source-note{font-size:12px;line-height:1.75}
  .actions{display:grid;grid-template-columns:1fr;gap:10px;margin-top:16px}
  .actions .button{min-height:48px;font-size:14px}
  .side-box h2{font-size:20px;line-height:1.4}
  .side-box p{font-size:14px;line-height:1.8}
  .side-link{font-size:14px;min-height:44px;align-items:center}
  .notice{font-size:12px;line-height:1.75}
  .footer{font-size:12px}

  /* Advertising uses the same phone navigation and comfortable reading size. */
  .breadcrumb{padding-block:12px;font-size:13px}
  .ad-section{padding-block:36px}
  .ad-grid{gap:24px}
  .ad-copy h1{font-size:34px;line-height:1.25}
  .ad-copy p,.guide-card p{font-size:14px;line-height:1.8}
  .ad-copy .button{min-height:48px;font-size:14px}
  .ad-type{padding:18px 14px;grid-template-columns:24px 1fr;gap:12px}
  .ad-type>.arrow{display:none}
  .ad-type small{font-size:13px}
  .ad-disclosure{font-size:12px}
  .guide h2{font-size:26px;line-height:1.35}
}