: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}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
.wrap{width:min(calc(100% - 40px),var(--wrap));margin-inline:auto}
.skip-link{position:fixed;left:16px;top:-100px;z-index:1000;background:var(--navy);color:#fff;padding:10px 14px;border-radius:10px}.skip-link:focus{top:12px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-notice{background:var(--cream-2);border-bottom:1px solid var(--line-warm);font-size:.86rem}.site-notice .wrap{display:flex;justify-content:center;gap:8px;padding:7px 0}.site-notice a{color:var(--navy);font-weight:700}
.site-header{position:sticky;top:0;z-index:80;background:rgba(255,249,238,.9);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.nav-shell{height:72px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;min-width:max-content}.brand img{width:42px;height:42px;border-radius:13px;object-fit:cover}.brand span{display:grid}.brand strong{font-size:1.1rem}.brand small{font-size:.62rem;letter-spacing:.13em;color:var(--primary)}
.main-nav{display:flex;align-items:center;gap:4px;flex:1}.main-nav a{padding:8px 11px;border-radius:var(--radius-pill);color:var(--navy-soft);font-weight:650;font-size:.93rem}.main-nav a:hover,.main-nav a.is-current{background:var(--sky-soft);color:var(--navy)}
.nav-actions{display:flex;align-items:center;gap:7px}.icon-button,.text-button,.menu-button,.primary-small{border:1px solid var(--line-strong);background:var(--cream-3);padding:9px 12px;border-radius:var(--radius-pill);color:var(--navy)}.primary-small{background:var(--primary);color:#fff;border-color:var(--primary)}
.mega-menu[hidden]{display:none!important}.mega-menu{border-top:1px solid var(--line);background:rgba(255,253,248,.98);box-shadow:var(--shadow)}.mega-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:18px 0 22px}.mega-grid a{padding:14px;border-radius:14px;background:var(--surface-blue);border:1px solid var(--line);display:grid}.mega-grid small{color:var(--text-3)}
.search-modal{display:none;position:fixed;inset:0;z-index:200;background:rgba(23,52,74,.48);padding:8vh 20px;align-items:flex-start;justify-content:center}.search-modal.is-open{display:flex}.search-modal[hidden]{display:none!important;}.search-dialog{width:min(760px,100%);background:var(--cream);border:1px solid rgba(255,255,255,.7);border-radius:var(--radius-large);box-shadow:0 30px 100px rgba(15,42,61,.28);padding:26px}.search-dialog-head{display:flex;justify-content:space-between;gap:20px;align-items:start}.search-dialog-head h2{margin:.2rem 0 0}.search-close{width:42px;height:42px;border:0;border-radius:50%;background:var(--surface);font-size:1.5rem;color:var(--navy)}.search-form{display:flex;gap:10px;margin:24px 0 16px}.search-form input{flex:1;border:1px solid var(--line-strong);border-radius:16px;background:#fff;padding:14px 16px;outline:0}.search-form input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(74,155,212,.12)}.search-form button{border:0;border-radius:16px;background:var(--primary);color:#fff;padding:0 22px;font-weight:700}.search-suggestions{display:flex;flex-wrap:wrap;gap:8px}.search-suggestions a{padding:8px 12px;border:1px solid var(--line);background:var(--surface);border-radius:var(--radius-pill)}.search-help{color:var(--text-2);font-size:.9rem}.search-help a{color:var(--primary);font-weight:700}body.search-open{overflow:hidden}
main{overflow:hidden}.page-section{padding:72px 0}.page-section.compact{padding:46px 0}.surface-blue{background:var(--bg-blue)}.surface-cream{background:var(--bg-cream)}.surface-dark{background:var(--navy);color:#fff}.surface-dark p,.surface-dark .section-head p,.surface-dark .card-meta{color:#c9d9e3}.eyebrow{display:inline-flex;align-items:center;gap:6px;text-transform:uppercase;letter-spacing:.1em;font-size:.74rem;font-weight:800;color:var(--primary)}.surface-dark .eyebrow{color:var(--sky)}
.section-head{display:flex;justify-content:space-between;gap:28px;align-items:end;margin-bottom:26px}.section-head h2{font-size:clamp(1.7rem,3vw,2.55rem);line-height:1.16;margin:.35rem 0 .6rem}.section-head p{max-width:720px;margin:0;color:var(--text-2)}.section-link{font-weight:750;color:var(--primary);white-space:nowrap}
.hero-asym{display:grid;grid-template-columns:minmax(0,7fr) minmax(380px,5fr);gap:38px;align-items:center;min-height:620px;padding:64px 0}.hero-copy h1{font-size:clamp(2.6rem,5.8vw,5.4rem);line-height:1.02;letter-spacing:-.04em;margin:.55rem 0 1rem;color:var(--navy)}.hero-copy p{font-size:1.08rem;color:var(--text-2);max-width:760px}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.button-primary,.button-secondary,.button-live{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 18px;border-radius:14px;font-weight:800}.button-primary{background:var(--primary);color:#fff}.button-secondary{border:1px solid var(--line-strong);background:var(--cream)}.button-live{background:var(--accent);color:#fff}.hero-visual{position:relative}.hero-visual>img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:32px;box-shadow:var(--shadow-hover)}.floating-panel{position:absolute;right:-12px;bottom:24px;width:min(320px,82%);padding:18px;background:rgba(255,255,255,.93);border:1px solid rgba(255,255,255,.8);border-radius:20px;box-shadow:var(--shadow)}
.chips,.content-rail,.anchor-rail{display:flex;gap:10px;overflow-x:auto;scrollbar-width:none;padding-bottom:6px}.chips::-webkit-scrollbar,.content-rail::-webkit-scrollbar,.anchor-rail::-webkit-scrollbar{display:none}.chip{white-space:nowrap;padding:9px 14px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-pill)}
.feature-mosaic{display:grid;grid-template-columns:1.45fr 1fr 1fr;grid-template-rows:1fr 1fr;gap:14px}.feature-mosaic>*:first-child{grid-row:1/3}.video-rank-split{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,.75fr);gap:24px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.vertical-feed{display:grid;gap:14px}.feature-row{display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:center}.feature-row.reverse{grid-template-columns:.95fr 1.05fr}.bento-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}.bento-grid>*{grid-column:span 4}.bento-grid>*:first-child{grid-column:span 7}.bento-grid>*:nth-child(2){grid-column:span 5}.live-stage{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(320px,.75fr);gap:22px}.community-columns{display:grid;grid-template-columns:1fr 1fr;gap:22px}.timeline{position:relative;display:grid;gap:0;border-left:2px solid var(--line-strong);padding-left:24px}.timeline>*{padding:0 0 26px;position:relative}.timeline>*::before{content:"";position:absolute;left:-31px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 5px var(--sky-soft)}.tag-trend-split{display:grid;grid-template-columns:.8fr 1.2fr;gap:30px}.device-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:46px;align-items:center}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}.step{counter-increment:step;padding:22px;border-top:3px solid var(--primary);background:var(--surface-blue);border-radius:0 0 18px 18px}.step::before{content:"0" counter(step);font-weight:900;color:var(--primary)}.comparison-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.faq-list{display:grid;gap:10px}.faq-item{border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:0 18px}.faq-item summary{cursor:pointer;font-weight:800;padding:17px 0}.faq-item p{margin:0 0 18px;color:var(--text-2)}
.video-card,.live-card,.topic-card,.anchor-card,.special-card,.info-card{border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;background:var(--surface)}.video-card{transition:transform .2s ease,box-shadow .2s ease}.video-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}.media-frame,.live-media{position:relative;display:block;overflow:hidden;background:var(--sky-soft)}.ratio-16x9{aspect-ratio:16/9}.media-frame img,.live-media img{width:100%;height:100%;object-fit:cover;transition:transform .2s ease}.video-card:hover .media-frame img{transform:scale(1.02)}.play-icon{position:absolute;left:14px;bottom:13px;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.9);color:var(--navy);transition:transform .2s ease}.video-card:hover .play-icon{transform:scale(1.07)}.duration{position:absolute;right:10px;bottom:10px;background:rgba(15,42,61,.78);color:#fff;padding:3px 7px;border-radius:8px;font-size:.75rem}.card-body{padding:17px}.card-body h3{margin:.35rem 0 .5rem;line-height:1.35}.card-body p{margin:0 0 12px;color:var(--text-2);font-size:.92rem}.card-kicker{display:flex;flex-wrap:wrap;gap:6px;align-items:center;color:var(--primary);font-weight:800;font-size:.76rem}.tag{font-size:.68rem;font-weight:700;color:var(--navy-soft);background:var(--sky-soft);padding:3px 6px;border-radius:999px}.card-meta{display:flex;justify-content:space-between;gap:10px;color:var(--text-3);font-size:.8rem}.live-card{background:linear-gradient(180deg,#fff,var(--surface-cream))}.live-media{aspect-ratio:16/10}.live-media img{width:100%;height:100%;object-fit:cover}.live-badge{position:absolute;left:12px;top:12px;padding:5px 9px;border-radius:999px;background:var(--accent);color:#fff;font-size:.72rem;font-weight:900}.anchor-card{display:grid;grid-template-columns:74px 1fr;gap:14px;padding:16px;min-width:280px}.anchor-avatar{width:74px;height:74px;border-radius:50%;object-fit:cover;border:4px solid var(--cream-2)}.anchor-card h3{margin:.2rem 0}.anchor-card p{font-size:.88rem;color:var(--text-2)}.status-dot{font-size:.72rem;color:var(--accent);font-weight:800}.topic-card{display:grid;grid-template-columns:44px 1fr;gap:13px;padding:18px}.topic-avatar{width:44px;height:44px;border-radius:14px;background:var(--sky-soft);display:grid;place-items:center;font-weight:900;color:var(--navy)}.topic-card h3{margin:.2rem 0 .45rem}.topic-card p{color:var(--text-2);margin:0 0 9px}.rank-list{display:grid;gap:8px}.rank-item{display:grid;grid-template-columns:34px 1fr auto;gap:10px;align-items:center;padding:12px;border-bottom:1px solid var(--line)}.rank-number{font-weight:950;color:var(--primary)}
.site-footer{background:var(--navy);color:#fff;padding:72px 0 90px}.footer-grid{display:grid;grid-template-columns:1.8fr repeat(4,1fr);gap:34px}.footer-grid h2{font-size:2rem;line-height:1.2}.footer-grid h3{font-size:.95rem;color:var(--sky)}.footer-grid a{display:block;color:#d6e3eb;margin:8px 0;font-size:.9rem}.footer-brand p{color:#bcd0dc}.footer-bottom{margin-top:42px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);display:flex;justify-content:space-between;gap:20px;color:#9fb8c7;font-size:.8rem}.mobile-bottom-nav{display:none}.back-to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border:0;border-radius:50%;background:var(--navy);color:#fff;opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s}.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:none}
@media (max-width:1080px){.main-nav{display:none}.hero-asym{grid-template-columns:1fr 1fr}.grid-4{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1.6fr repeat(2,1fr)}.footer-grid>div:nth-child(n+4){margin-top:10px}.feature-mosaic{grid-template-columns:1fr 1fr}.feature-mosaic>*:first-child{grid-column:1/3;grid-row:auto}.bento-grid>*{grid-column:span 6}.live-stage,.video-rank-split{grid-template-columns:1fr}.device-layout{grid-template-columns:.9fr 1.1fr}}
@media (max-width:760px){body{padding-bottom:64px}.wrap{width:min(calc(100% - 28px),var(--wrap))}.site-notice{display:none}.nav-shell{height:62px;gap:10px}.brand small,.text-button,.primary-small{display:none}.brand img{width:36px;height:36px}.nav-actions{margin-left:auto}.hero-asym{grid-template-columns:1fr;min-height:auto;padding:44px 0}.hero-copy h1{font-size:clamp(2.4rem,13vw,4rem)}.hero-visual{margin-top:8px}.floating-panel{right:10px;bottom:12px}.page-section{padding:52px 0}.section-head{display:block}.section-link{display:inline-flex;margin-top:10px}.grid-3{grid-template-columns:1fr 1fr}.grid-4{display:flex;overflow-x:auto;scroll-snap-type:x mandatory}.grid-4>*{min-width:78vw;scroll-snap-align:start}.feature-mosaic{grid-template-columns:1fr}.feature-mosaic>*:first-child{grid-column:auto}.community-columns,.tag-trend-split,.device-layout,.feature-row,.feature-row.reverse{grid-template-columns:1fr}.bento-grid{grid-template-columns:1fr}.bento-grid>*{grid-column:auto!important}.steps{grid-template-columns:1fr 1fr}.comparison-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/3}.footer-bottom{display:block}.mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:70;height:60px;display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,253,248,.96);backdrop-filter:blur(16px);border-top:1px solid var(--line)}.mobile-bottom-nav a{display:grid;place-items:center;font-size:.76rem;font-weight:700}.back-to-top{bottom:78px}.mega-grid{grid-template-columns:1fr 1fr}.search-modal{padding:5vh 12px}.search-dialog{padding:18px}.search-form{display:grid;grid-template-columns:1fr}.search-form button{height:44px}}
@media (max-width:480px){.grid-3{display:flex;overflow-x:auto}.grid-3>*{min-width:84vw}.steps{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}.anchor-card{min-width:82vw}.nav-actions .icon-button,.nav-actions .menu-button{padding:8px 10px}}