:root{
  --primary:#4A9BD4;--primary-2:#6DB7E6;--sky:#8CCCF0;--sky-light:#CBE9F8;--sky-soft:#EDF8FD;
  --cream:#FFF9EE;--cream-2:#FFF4DF;--cream-3:#FDFBF6;--navy:#17344A;--navy-2:#244A64;--navy-soft:#4F6D80;
  --accent:#EF8E68;--accent-2:#F2B36F;--accent-soft:#FFF0E8;--bg:#FFFDF8;--bg-blue:#F3FAFE;--bg-cream:#FFF9EE;
  --surface:#FFFFFF;--surface-blue:#F8FCFF;--surface-cream:#FFFDF8;--text:#203542;--text-2:#5E7481;--text-3:#8A9AA3;
  --line:rgba(74,155,212,.12);--line-strong:rgba(74,155,212,.24);--line-warm:rgba(239,142,104,.14);
  --shadow:0 8px 28px rgba(31,88,124,.08);--shadow-hover:0 16px 42px rgba(31,88,124,.14);
  --radius:12px;--radius-card:18px;--radius-large:26px;--radius-pill:999px;--wrap:1320px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;line-height:1.65}body.search-open{overflow:hidden}img{display:block;max-width:100%}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit}.wrap{width:min(calc(100% - 40px),var(--wrap));margin-inline:auto}.narrow{max-width:920px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:16px;top:-80px;z-index:200;background:var(--navy);color:#fff;padding:10px 16px;border-radius:10px}.skip-link:focus{top:16px}
.top-notice{background:var(--cream-2);border-bottom:1px solid var(--line-warm);font-size:13px}.top-notice .wrap{min-height:36px;display:flex;align-items:center;gap:14px}.top-notice span{color:var(--text-2);flex:1}.top-notice a{color:var(--navy-2);font-weight:700}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,249,238,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);transition:.2s ease}.site-header.is-scrolled{box-shadow:0 8px 24px rgba(31,88,124,.08);border-color:var(--line-strong)}.header-row{height:72px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;gap:10px;min-width:max-content}.brand img{width:42px;height:42px;border-radius:14px;object-fit:cover}.brand span{display:grid}.brand strong{font-size:18px;letter-spacing:.02em}.brand small{font-size:9px;color:var(--text-3);letter-spacing:.18em}.desktop-nav{display:flex;gap:4px;align-items:center;flex:1}.desktop-nav a,.header-action{padding:9px 12px;border-radius:var(--radius-pill);font-size:14px;color:var(--text-2)}.desktop-nav a:hover,.desktop-nav a.is-active,.header-action:hover{color:var(--navy);background:var(--sky-soft)}.header-actions{display:flex;align-items:center;gap:3px}.header-action{border:0;background:transparent;cursor:pointer}.header-action--app{background:var(--primary);color:#fff}.menu-toggle{display:none;border:1px solid var(--line-strong);background:var(--surface);padding:8px 12px;border-radius:10px}.mega-strip{border-top:1px solid rgba(74,155,212,.08);background:rgba(255,255,255,.46)}.mega-strip .wrap{height:38px;display:flex;align-items:center;gap:18px;overflow:auto;scrollbar-width:none}.mega-strip a{font-size:12px;color:var(--text-2);white-space:nowrap}.mega-strip a:hover{color:var(--primary)}.mobile-menu{position:absolute;left:0;right:0;top:100%;padding:14px 20px;background:var(--cream);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}.mobile-menu[hidden]{display:none!important}.mobile-menu a{display:block;padding:12px 8px;border-bottom:1px solid var(--line)}
.search-modal{display:none;position:fixed;inset:0;z-index:500;align-items:flex-start;justify-content:center;padding:12vh 20px 30px;background:rgba(15,42,61,.52);backdrop-filter:blur(8px)}.search-modal.is-open{display:flex}.search-modal[hidden]{display:none !important}.search-dialog{width:min(760px,100%);background:var(--cream);border:1px solid var(--line-strong);border-radius:var(--radius-large);box-shadow:0 28px 90px rgba(15,42,61,.25);padding:28px}.search-dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px}.search-dialog h2{margin:4px 0 0;font-size:34px}.search-close{width:42px;height:42px;border-radius:50%;border:1px solid var(--line-strong);background:#fff;cursor:pointer;font-size:26px;line-height:1}.global-search-form,.hero-search,.search-page-form{display:flex;gap:10px;margin-top:22px}.global-search-form input,.hero-search input,.search-page-form input{flex:1;min-width:0;padding:14px 16px;border:1px solid var(--line-strong);border-radius:14px;background:#fff;color:var(--text);outline:none}.global-search-form input:focus,.hero-search input:focus,.search-page-form input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(74,155,212,.12)}.global-search-form button,.hero-search button{border:0;border-radius:14px;background:var(--primary);color:#fff;padding:0 20px;font-weight:700}.search-suggestions{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.search-suggestions a{font-size:13px;padding:7px 11px;border-radius:var(--radius-pill);background:var(--sky-soft);color:var(--navy-2)}
main{overflow:hidden}.hero{padding:64px 0 46px;background:linear-gradient(145deg,var(--cream) 0%,var(--cream-3) 44%,var(--sky-soft) 100%);position:relative}.hero:before{content:"";position:absolute;width:440px;height:440px;border-radius:50%;right:-180px;top:-200px;background:rgba(140,204,240,.26);filter:blur(2px)}.hero-grid,.subhero-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(360px,5fr);gap:56px;align-items:center}.hero-copy h1,.subhero h1{font-size:clamp(42px,6vw,78px);line-height:1.03;letter-spacing:-.045em;margin:10px 0 24px;color:var(--navy)}.hero-copy p,.subhero p{font-size:17px;color:var(--text-2);max-width:700px}.eyebrow,.kicker{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--primary)}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 19px;border-radius:14px;font-weight:800;border:1px solid transparent}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--navy-2)}.btn-outline{border-color:var(--line-strong);background:var(--cream);color:var(--navy)}.btn-disabled{background:#eef2f4;color:var(--text-3);cursor:not-allowed}.hero-media{position:relative}.hero-media>img,.subhero-grid>img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:32px;box-shadow:var(--shadow-hover)}.hero-float{position:absolute;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:14px 16px;display:grid}.hero-float strong{font-size:26px;color:var(--primary)}.hero-float span{font-size:12px;color:var(--text-2)}.hero-float--top{right:-18px;top:42px}.hero-float--bottom{left:-22px;bottom:28px}.subhero{padding:56px 0;background:linear-gradient(145deg,var(--cream),var(--bg-blue))}.subhero--dark,.watch-hero{background:var(--navy);color:#fff}.subhero--dark h1,.subhero--dark p,.subhero--dark .eyebrow,.watch-hero h1,.watch-hero p,.watch-hero .eyebrow{color:#fff}.subhero--dark .subhero-grid>img{box-shadow:none}.section{padding:66px 0;background:var(--bg)}.section--compact{padding:34px 0}.section--cream{background:var(--cream)}.section--soft{background:var(--bg-blue)}.section--dark{background:var(--navy);color:#fff}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:28px}.section-head h2{font-size:clamp(28px,4vw,44px);line-height:1.1;letter-spacing:-.025em;margin:0;color:var(--navy)}.section-head p{margin:10px 0 0;color:var(--text-2);max-width:700px}.section--dark .section-head h2,.section--dark .section-head p,.section-head--inverse h2,.section-head--inverse p{color:#fff}.section-head--center{text-align:center;display:block}.section-head--center p{margin-inline:auto}.text-link{font-weight:800;color:var(--primary);white-space:nowrap}.section--dark .text-link{color:var(--sky-light)}
.grid{display:grid;gap:20px}.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.video-card{min-width:0}.video-card .media-frame{position:relative;display:block;overflow:hidden;border-radius:var(--radius-card);background:var(--sky-soft);aspect-ratio:16/9}.video-card img{width:100%;height:100%;object-fit:cover;transition:transform .25s ease}.video-card:hover img{transform:scale(1.02)}.play-button{position:absolute;left:14px;bottom:14px;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.9);color:var(--navy);font-size:13px;transition:transform .2s ease}.video-card:hover .play-button{transform:scale(1.06)}.duration{position:absolute;right:10px;bottom:10px;padding:4px 7px;border-radius:7px;background:rgba(15,42,61,.78);color:#fff;font-size:11px}.card-body{padding:14px 2px 2px}.eyeline,.card-meta{display:flex;justify-content:space-between;gap:12px;align-items:center;color:var(--text-3);font-size:12px}.eyeline span{color:var(--primary);font-weight:700}.video-card h3,.live-card h3,.topic-card h3,.story-card h3,.channel-card h3,.tutorial-card h3{font-size:18px;line-height:1.35;margin:7px 0;color:var(--navy)}.video-card p,.live-card p,.topic-card p,.story-card p,.channel-card p,.tutorial-card p{font-size:13px;color:var(--text-2);margin:0 0 10px}.icon-button{border:0;background:transparent;cursor:pointer;font-size:20px;color:var(--text-3)}.icon-button.is-favorite{color:var(--accent)}.video-card--lead h3{font-size:30px}.video-card--compact h3{font-size:15px}.video-card--compact p{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.video-card--stream{display:grid;grid-template-columns:180px 1fr;gap:14px;align-items:center}.video-card--stream .media-frame{aspect-ratio:16/10}.video-card--stream .card-body{padding:0}.video-card--stream p{display:none}.lead-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(360px,.7fr);gap:26px}.lead-side{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.rank-split{display:grid;grid-template-columns:minmax(0,.9fr) minmax(420px,1.1fr);gap:34px}.compact-list{display:grid;gap:12px}.compact-list--two{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.compact-video{display:grid;grid-template-columns:auto 112px 1fr;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}.compact-video>img{width:112px;aspect-ratio:16/10;object-fit:cover;border-radius:12px}.compact-video h3{font-size:15px;line-height:1.35;margin:2px 0}.compact-video p{font-size:12px;color:var(--text-3);margin:0}.rank-num{font-size:22px;font-weight:900;color:var(--primary);min-width:28px}.compact-list--inverse .compact-video{border-color:rgba(255,255,255,.12)}.compact-list--inverse h3,.compact-list--inverse p{color:#fff}.dual-stream{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.masonry-grid{columns:4 240px;column-gap:20px}.masonry-grid .video-card{break-inside:avoid;margin-bottom:24px}.masonry-grid .video-card:nth-child(3n+1) .media-frame{aspect-ratio:4/3}.rail{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(260px,31%);gap:18px;overflow-x:auto;overscroll-behavior-inline:contain;padding-bottom:10px;scroll-snap-type:x proximity}.rail>*{scroll-snap-align:start}.feature-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:center}.feature-split>img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-large)}.feature-split--reverse>img{order:2}.bento-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:minmax(180px,auto);gap:18px}.video-card--bento-large{grid-column:span 2;grid-row:span 2}.video-card--bento-large .media-frame{aspect-ratio:auto;height:100%;min-height:390px}.video-card--bento .card-body p{display:none}.live-stage{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(330px,.55fr);gap:24px}.live-side{display:grid;gap:14px}.live-card{background:var(--surface);border-radius:var(--radius-card);overflow:hidden;border:1px solid var(--line)}.section--dark .live-card{background:#123047;border-color:rgba(255,255,255,.08)}.section--dark .live-card h3,.section--dark .live-card p,.section--dark .live-card .card-meta{color:#fff}.live-cover{position:relative;aspect-ratio:16/9;overflow:hidden}.live-cover img{width:100%;height:100%;object-fit:cover}.live-badge{position:absolute;left:12px;top:12px;background:var(--accent);color:#fff;font-size:10px;font-weight:900;letter-spacing:.08em;padding:5px 8px;border-radius:var(--radius-pill)}.live-card .card-body{padding:14px}.live-card--stage h3{font-size:27px}.live-card--side{display:grid;grid-template-columns:130px 1fr}.live-card--side .live-cover{aspect-ratio:1}.live-card--side .card-body{padding:12px}.live-card--side p{display:none}.live-card--replay{min-width:280px}.anchor-rail{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(180px,1fr);gap:18px;overflow-x:auto;padding-bottom:8px}.anchor-card{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card)}.anchor-card img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:14px}.anchor-card h3{margin:8px 0 2px;color:var(--navy)}.anchor-card strong{font-size:12px;color:var(--primary)}.anchor-card p,.anchor-card small{display:block;font-size:12px;color:var(--text-2)}.anchor-card--round{text-align:center;background:transparent;border:0;padding:6px}.anchor-card--round img{width:96px;height:96px;border-radius:50%;margin:0 auto;border:4px solid var(--cream);outline:2px solid var(--primary-2)}.anchor-card--round p{display:none}.anchor-card--horizontal{display:grid;grid-template-columns:92px 1fr;gap:14px}.anchor-card--horizontal img{width:92px;height:110px}.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--accent);margin-right:5px}.anchor-list-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.pill-cloud,.chip-row,.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}.pill,.chip,.tag-cloud a{padding:9px 14px;border-radius:var(--radius-pill);background:var(--surface);border:1px solid var(--line-strong);font-size:13px;color:var(--navy-2)}.tag-cloud a:nth-child(3n){background:var(--cream-2)}.tag-cloud a:nth-child(3n+1){background:var(--sky-soft)}.channel-chip-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.channel-card{padding:16px;border-radius:var(--radius-card);background:rgba(255,255,255,.72);border:1px solid var(--line)}.channel-card img{width:100%;aspect-ratio:16/8;object-fit:cover;border-radius:12px;margin-bottom:12px}.magazine-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:20px}.magazine-grid .video-card{grid-column:span 4}.magazine-grid .video-card:nth-child(5n+1){grid-column:span 8}.magazine-grid .video-card:nth-child(5n+1) .media-frame{aspect-ratio:2/1}.knowledge-layout{display:grid;grid-template-columns:.7fr 1.3fr;gap:36px;align-items:start}.knowledge-intro{position:sticky;top:140px}.knowledge-intro img{border-radius:var(--radius-large);margin-bottom:18px}.story-stack{display:grid;gap:20px}.story-card{display:grid;grid-template-columns:minmax(220px,.55fr) minmax(0,1.45fr);gap:24px;align-items:center;padding:16px;border-radius:var(--radius-card);background:var(--surface);border:1px solid var(--line)}.story-card:nth-child(even){grid-template-columns:minmax(0,1.45fr) minmax(220px,.55fr)}.story-card:nth-child(even)>img{order:2}.story-card img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:14px}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.topic-card{padding:20px;border-radius:var(--radius-card);background:var(--surface);border:1px solid var(--line)}.topic-author{display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:8px;font-size:12px;color:var(--text-3)}.topic-author img{width:34px;height:34px;border-radius:50%;object-fit:cover}.topic-related{display:flex;gap:8px;flex-wrap:wrap;padding:10px;border-radius:10px;background:var(--sky-soft);font-size:12px}.topic-related span{color:var(--primary)}.topic-footer{display:flex;justify-content:space-between;gap:10px;margin-top:12px;font-size:11px;color:var(--text-3)}.topic-card--minimal{border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;padding:14px 0}.topic-card--timeline{position:relative;margin-left:18px}.topic-card--timeline:before{content:"";position:absolute;left:-20px;top:28px;width:10px;height:10px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 5px var(--sky-soft)}.timeline{border-left:1px solid var(--line-strong);padding-left:18px;display:grid;gap:10px}.topic-focus{display:grid;grid-template-columns:.8fr 1.2fr;gap:34px;align-items:center}.topic-focus>img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-large)}.trend-list{display:grid;gap:12px}.trend-row{display:grid;grid-template-columns:minmax(220px,.9fr) minmax(180px,1.1fr) auto;align-items:center;gap:18px;padding:14px 0;border-bottom:1px solid var(--line)}.trend-row div:first-child{display:grid}.trend-row span,.trend-row small{font-size:11px;color:var(--text-3)}.trend-track{height:8px;background:var(--sky-soft);border-radius:var(--radius-pill);overflow:hidden}.trend-track i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--sky));border-radius:inherit}.tutorial-card{display:grid;grid-template-columns:110px 1fr;gap:15px;padding:16px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--surface)}.tutorial-card img{width:110px;height:120px;object-fit:cover;border-radius:12px}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.step{padding:20px;border-left:3px solid var(--primary);background:var(--surface);border-radius:0 var(--radius-card) var(--radius-card) 0}.step>span{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--sky-soft);font-weight:900;color:var(--primary)}.step h3{margin:14px 0 6px}.step p{font-size:13px;color:var(--text-2)}.app-showcase{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}.device-stack{position:relative;min-height:430px}.device-stack img{position:absolute;width:68%;border-radius:30px;box-shadow:var(--shadow-hover)}.device-stack img:first-child{left:0;top:0}.device-stack img:last-child{right:0;bottom:0;width:54%}.feature-list{display:grid;gap:10px;margin:18px 0}.feature-list article{padding:12px 14px;border-radius:12px;background:var(--sky-soft)}.feature-list p{margin:4px 0 0;color:var(--text-2);font-size:12px}.safety-duo{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.safety-card{padding:22px;border-radius:var(--radius-large);background:var(--surface);border:1px solid var(--line)}.safety-card img{width:100%;aspect-ratio:16/8;object-fit:cover;border-radius:16px}.faq-list{display:grid;gap:12px}.faq-item{border:1px solid var(--line);border-radius:16px;background:var(--surface);overflow:hidden}.faq-item h3{margin:0}.faq-toggle{width:100%;display:flex;justify-content:space-between;gap:16px;text-align:left;border:0;background:transparent;padding:17px 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