:root {
    --bg: #080a12;
    --surface: #111522;
    --surface-2: #171c2c;
    --text: #f7f7fb;
    --muted: #a9b0c3;
    --line: rgba(255, 255, 255, .09);
    --brand: #9a6cff;
    --brand-2: #f272c5;
    --accent: #ffb24a;
    --radius: 22px;
    --shadow: 0 20px 60px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 0; overflow-x: hidden; color: var(--text); background: radial-gradient(circle at 82% 6%, rgba(154, 108, 255, .16), transparent 27rem), var(--bg); font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.68; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.container { width: min(1200px, calc(100% - 40px)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 30; background: rgba(8, 10, 18, .86); border-bottom: 1px solid var(--line); backdrop-filter: blur(18px); }
.header-inner { min-height: 78px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; font-size: 1.22rem; font-weight: 800; letter-spacing: .02em; }
.brand-mark { width: 38px; height: 38px; border-radius: 13px; display: grid; place-items: center; background: linear-gradient(135deg, var(--brand), var(--brand-2)); box-shadow: 0 8px 24px rgba(154,108,255,.35); }
.brand-mark::before { content: ""; width: 0; height: 0; border-top: 8px solid transparent; border-bottom: 8px solid transparent; border-left: 13px solid white; margin-left: 3px; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav-link { min-height: 44px; padding: 0 11px; display: inline-flex; align-items: center; gap: 7px; border-radius: 12px; color: var(--muted); font-size: .9rem; white-space: nowrap; }
.nav-link:hover, .nav-link.active { color: white; background: rgba(154,108,255,.14); }
.icon { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon.fill { fill: currentColor; stroke: none; }
.menu-button { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 12px; color: white; background: var(--surface); }
.hero { margin-top: 34px; min-height: 520px; position: relative; overflow: hidden; display: grid; align-items: end; border: 1px solid var(--line); border-radius: 32px; box-shadow: var(--shadow); }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(6,8,15,.96) 0%, rgba(6,8,15,.72) 45%, rgba(6,8,15,.1) 80%), linear-gradient(0deg, rgba(6,8,15,.92), transparent 52%); }
.hero-content { position: relative; z-index: 2; width: min(680px, 90%); padding: clamp(28px, 6vw, 68px); }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: #d7c8ff; font-size: .86rem; letter-spacing: .12em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--brand); }
.hero h1, .hero h2 { margin: 14px 0 12px; font-size: clamp(2.45rem, 6vw, 5.2rem); line-height: 1.02; letter-spacing: -.05em; }
.hero h2 { font-size: clamp(2.1rem, 5vw, 4.6rem); }
.hero p { color: #d2d5df; font-size: 1.06rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.button { min-height: 48px; padding: 0 20px; border-radius: 14px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; border: 1px solid transparent; font-weight: 700; cursor: pointer; }
.button.primary { color: #111; background: white; }
.button.ghost { border-color: rgba(255,255,255,.18); background: rgba(255,255,255,.08); }
.meta-row { display: flex; flex-wrap: wrap; gap: 10px 18px; color: var(--muted); font-size: .88rem; }
.section { margin-top: 86px; scroll-margin-top: 100px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 25px; }
.section-head h2 { margin: 0; font-size: clamp(1.65rem, 3vw, 2.4rem); letter-spacing: -.035em; }
.section-head p { margin: 6px 0 0; max-width: 650px; color: var(--muted); }
.text-link { color: #d6c5ff; font-weight: 700; white-space: nowrap; }
.video-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.video-card { min-width: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); transition: transform .25s ease, border-color .25s ease; }
.video-card:hover { transform: translateY(-5px); border-color: rgba(154,108,255,.55); }
.cover { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #1d2230; }
.cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.video-card:hover .cover img { transform: scale(1.04); }
.play { position: absolute; left: 16px; bottom: 14px; width: 43px; height: 43px; border-radius: 50%; display: grid; place-items: center; background: rgba(255,255,255,.92); color: #10121a; box-shadow: 0 8px 24px rgba(0,0,0,.25); }
.play::before { content: ""; width: 0; height: 0; border-top: 7px solid transparent; border-bottom: 7px solid transparent; border-left: 11px solid currentColor; margin-left: 3px; }
.duration { position: absolute; right: 10px; bottom: 10px; padding: 3px 8px; border-radius: 7px; background: rgba(6,8,14,.84); font-size: .75rem; }
.card-body { padding: 17px; }
.card-body h3 { margin: 0 0 8px; min-height: 3.15em; font-size: 1.03rem; line-height: 1.55; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-body p { margin: 0 0 13px; min-height: 4.8em; color: var(--muted); font-size: .88rem; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.tag { display: inline-flex; padding: 4px 9px; border: 1px solid var(--line); border-radius: 999px; color: #d5d8e3; font-size: .75rem; }
.feature-split { display: grid; grid-template-columns: 1.35fr .65fr; gap: 22px; }
.wide-feature { position: relative; overflow: hidden; min-height: 410px; border-radius: 24px; border: 1px solid var(--line); }
.wide-feature img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.wide-feature::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,7,13,.96), rgba(5,7,13,.05) 72%); }
.wide-copy { position: absolute; z-index: 2; left: 28px; right: 28px; bottom: 26px; }
.wide-copy h3 { margin: 7px 0; font-size: clamp(1.55rem,3vw,2.4rem); }
.stack-list { display: grid; gap: 12px; }
.stack-item { padding: 18px; display: grid; grid-template-columns: 52px 1fr; gap: 14px; align-items: center; border-radius: 16px; background: linear-gradient(135deg, var(--surface-2), var(--surface)); border: 1px solid var(--line); }
.stack-num { font-size: 1.5rem; color: var(--accent); font-weight: 900; }
.stack-item h3 { margin: 0 0 5px; font-size: .96rem; line-height: 1.45; }
.stack-item p { margin: 0; color: var(--muted); font-size: .8rem; }
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.category-card { min-height: 205px; padding: 23px; border-radius: 20px; border: 1px solid var(--line); background: radial-gradient(circle at 100% 0, var(--glow), transparent 55%), var(--surface); }
.category-card .category-icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; color: white; background: var(--glow); }
.category-card h3 { margin: 20px 0 8px; }
.category-card p { margin: 0; color: var(--muted); font-size: .88rem; }
.category-card.violet { --glow: rgba(154,108,255,.45); }.category-card.orange { --glow: rgba(255,151,67,.4); }.category-card.rose { --glow: rgba(242,114,197,.4); }.category-card.cyan { --glow: rgba(48,199,214,.4); }.category-card.amber { --glow: rgba(243,188,73,.4); }.category-card.lime { --glow: rgba(122,206,117,.4); }.category-card.blue { --glow: rgba(86,145,255,.4); }.category-card.purple { --glow: rgba(177,97,255,.4); }
.poster-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.poster-card { position: relative; min-height: 360px; overflow: hidden; border-radius: 20px; border: 1px solid var(--line); }
.poster-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.poster-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(6,8,15,.97), rgba(6,8,15,.06) 72%); }
.poster-copy { position: absolute; z-index: 2; left: 18px; right: 18px; bottom: 16px; }
.poster-copy h3 { margin: 7px 0 3px; font-size: 1rem; line-height: 1.45; }
.timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border: 1px solid var(--line); border-radius: 22px; overflow: hidden; }
.timeline-item { padding: 26px 20px; border-right: 1px solid var(--line); background: var(--surface); }
.timeline-item:last-child { border-right: 0; }
.timeline-time { color: var(--accent); font-weight: 800; }
.timeline-item h3 { font-size: .95rem; }
.rank-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; padding: clamp(24px,5vw,48px); border-radius: 26px; background: linear-gradient(135deg, #17142b, #111522 55%, #172033); border: 1px solid var(--line); }
.rank-list { display: grid; gap: 2px; }
.rank-item { display: grid; grid-template-columns: 46px 1fr auto; gap: 14px; align-items: center; padding: 15px 0; border-bottom: 1px solid var(--line); }
.rank-no { font-size: 1.65rem; font-weight: 900; color: #65708a; }
.rank-item:nth-child(-n+3) .rank-no { color: var(--accent); }
.rank-title { font-weight: 700; }
.heat { color: var(--muted); font-size: .82rem; text-align: right; }
.topic-grid { display: grid; grid-template-columns: 1.15fr .85fr .85fr; gap: 18px; }
.topic-card { position: relative; min-height: 260px; overflow: hidden; padding: 25px; display: flex; align-items: end; border-radius: 22px; border: 1px solid var(--line); background-size: cover; background-position: center; }
.topic-card:first-child { grid-row: span 2; min-height: 538px; }
.topic-card::before { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(7,8,15,.98), rgba(7,8,15,.12)); }
.topic-copy { position: relative; z-index: 2; }
.topic-copy h3 { margin: 8px 0; font-size: 1.3rem; }
.creator-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.creator { padding: 24px; text-align: center; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.avatar { width: 74px; height: 74px; margin: 0 auto 14px; display: grid; place-items: center; border-radius: 50%; background: linear-gradient(135deg, var(--brand), var(--brand-2)); font-size: 1.35rem; font-weight: 900; }
.creator p { color: var(--muted); font-size: .84rem; }
.tags { display: flex; flex-wrap: wrap; gap: 12px; padding: 30px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.tag-link { padding: 10px 16px; border-radius: 999px; background: var(--surface-2); color: #d8dbe5; }
.about { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: center; padding: 44px; border-radius: 26px; border: 1px solid var(--line); background: linear-gradient(135deg, rgba(154,108,255,.13), rgba(242,114,197,.05)); }
.about-mark { min-height: 280px; display: grid; place-items: center; border-radius: 20px; background: radial-gradient(circle, rgba(154,108,255,.55), transparent 35%), #0c0e18; font-size: clamp(4rem,10vw,8rem); font-weight: 900; color: white; }
.about p { color: var(--muted); }
.subscribe { margin-top: 86px; padding: clamp(28px,6vw,58px); display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; overflow: hidden; border-radius: 28px; background: linear-gradient(135deg, #8857f0, #bc5ed7 55%, #ef7f87); }
.subscribe h2 { margin: 0 0 10px; font-size: clamp(1.8rem,4vw,3.25rem); }
.subscribe p { margin: 0; max-width: 690px; color: rgba(255,255,255,.86); }
.qr { width: 142px; aspect-ratio: 1; padding: 12px; border-radius: 18px; background: white; box-shadow: var(--shadow); }
.qr img { width: 100%; height: 100%; }
.breadcrumb { margin: 28px auto 0; color: var(--muted); font-size: .88rem; }
.category-hero { margin-top: 30px; padding: clamp(32px,6vw,64px); border: 1px solid var(--line); border-radius: 28px; background: radial-gradient(circle at 90% 0, rgba(154,108,255,.32), transparent 32rem), var(--surface); }
.category-hero h1 { margin: 8px 0 12px; font-size: clamp(2.2rem,6vw,4.6rem); }
.category-hero p { max-width: 760px; color: var(--muted); font-size: 1.02rem; }
.featured-list { display: grid; grid-template-columns: 1.2fr .8fr; gap: 22px; }
.mini-list { display: grid; gap: 14px; }
.mini-card { display: grid; grid-template-columns: 150px 1fr; gap: 16px; align-items: center; padding: 12px; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); }
.mini-card .cover { border-radius: 12px; }
.mini-card h3 { margin: 0 0 5px; font-size: .96rem; }
.mini-card p { margin: 0; color: var(--muted); font-size: .8rem; }
.player-shell { margin-top: 28px; overflow: hidden; border-radius: 24px; border: 1px solid var(--line); background: #02030a; box-shadow: var(--shadow); }
.player-screen { position: relative; aspect-ratio: 16/9; display: grid; place-items: center; overflow: hidden; }
.player-screen img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .7; }
.player-screen::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle, transparent, rgba(0,0,0,.5)); }
.main-play { position: relative; z-index: 2; width: 84px; height: 84px; border: 0; border-radius: 50%; background: rgba(255,255,255,.94); cursor: pointer; }
.main-play::before { content: ""; display: block; width: 0; height: 0; margin: auto; border-top: 13px solid transparent; border-bottom: 13px solid transparent; border-left: 20px solid #11131c; transform: translateX(3px); }
.main-play.playing::before { width: 18px; height: 24px; border: 0; border-left: 6px solid #11131c; border-right: 6px solid #11131c; transform: none; }
.player-message { position: absolute; z-index: 2; bottom: 36px; color: white; padding: 8px 14px; border-radius: 999px; background: rgba(0,0,0,.55); font-size: .86rem; }
.controls { min-height: 64px; padding: 0 20px; display: grid; grid-template-columns: auto 1fr auto auto auto; gap: 16px; align-items: center; }
.control-button { border: 0; color: white; background: transparent; cursor: pointer; }
.progress { height: 5px; border-radius: 5px; background: #33394b; overflow: hidden; }
.progress::before { content: ""; display: block; width: 28%; height: 100%; background: linear-gradient(90deg, var(--brand), var(--brand-2)); }
.article-head { margin: 34px 0 20px; }
.article-head h1 { margin: 10px 0; max-width: 920px; font-size: clamp(2rem,5vw,3.7rem); line-height: 1.18; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 36px; margin-top: 42px; }
.article-copy { min-width: 0; }
.article-copy h2 { margin-top: 40px; font-size: 1.55rem; }
.article-copy p { color: #c5cad7; }
.scene-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.scene-grid figure { margin: 0; overflow: hidden; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); }
.scene-grid img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.scene-grid figcaption { padding: 10px 13px; color: var(--muted); font-size: .8rem; }
.highlight-list { padding: 0; list-style: none; display: grid; gap: 12px; }
.highlight-list li { padding: 16px 18px; border-left: 3px solid var(--brand); border-radius: 0 12px 12px 0; background: var(--surface); }
.sidebar { align-self: start; position: sticky; top: 105px; }
.side-box { padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.side-box h2 { margin-top: 0; font-size: 1.1rem; }
.side-link { display: block; padding: 13px 0; border-top: 1px solid var(--line); font-size: .9rem; }
.article-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 36px; }
.article-nav a, .article-nav span { min-height: 76px; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.empty-nav { opacity: .55; }
.site-footer { margin-top: 86px; padding: 54px 0 28px; border-top: 1px solid var(--line); background: #06070d; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 34px; }
.footer-grid h2 { font-size: .95rem; }
.footer-grid p, .footer-grid a { color: var(--muted); font-size: .88rem; }
.footer-links { display: grid; gap: 9px; }
.copyright { margin-top: 34px; padding-top: 22px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid var(--line); color: #777f94; font-size: .8rem; }
.back-top { position: fixed; right: 22px; bottom: 22px; width: 45px; height: 45px; border: 1px solid var(--line); border-radius: 50%; color: white; background: var(--surface-2); cursor: pointer; opacity: 0; pointer-events: none; transition: opacity .2s; }
.back-top.show { opacity: 1; pointer-events: auto; }

@media (max-width: 1020px) {
    .site-nav { display: none; position: absolute; left: 20px; right: 20px; top: 70px; padding: 12px; flex-wrap: wrap; background: #111522; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
    .site-nav.open { display: flex; }
    .menu-button { display: inline-grid; place-items: center; }
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .poster-row { grid-template-columns: repeat(3, 1fr); }
    .poster-card:nth-child(n+4) { display: none; }
    .timeline { grid-template-columns: repeat(3, 1fr); }
    .timeline-item:nth-child(n+4) { display: none; }
    .topic-grid { grid-template-columns: 1fr 1fr; }
    .topic-card:first-child { grid-column: span 2; grid-row: auto; min-height: 430px; }
    .article-layout { grid-template-columns: 1fr; }
    .sidebar { position: static; }
}

@media (max-width: 720px) {
    .container { width: min(100% - 28px, 1200px); }
    .header-inner { min-height: 68px; }
    .site-nav { top: 61px; }
    .nav-link { width: calc(50% - 2px); }
    .hero { margin-top: 22px; min-height: 540px; }
    .hero::after { background: linear-gradient(0deg, rgba(6,8,15,.97) 10%, rgba(6,8,15,.28) 100%); }
    .hero-content { width: 100%; padding: 28px 22px; }
    .section { margin-top: 62px; }
    .section-head { display: block; }
    .section-head .text-link { display: inline-block; margin-top: 12px; }
    .video-grid, .category-grid, .feature-split, .rank-panel, .about, .subscribe, .featured-list { grid-template-columns: 1fr; }
    .poster-row { grid-template-columns: 1fr 1fr; }
    .poster-card { min-height: 300px; }
    .poster-card:nth-child(3) { display: none; }
    .timeline { grid-template-columns: 1fr; }
    .timeline-item { border-right: 0; border-bottom: 1px solid var(--line); }
    .timeline-item:nth-child(n+4) { display: block; }
    .rank-panel { padding: 24px 18px; }
    .topic-grid { grid-template-columns: 1fr; }
    .topic-card:first-child { grid-column: auto; min-height: 360px; }
    .creator-strip { grid-template-columns: 1fr 1fr; }
    .about { padding: 26px; }
    .subscribe { text-align: center; }
    .qr { margin: auto; }
    .mini-card { grid-template-columns: 112px 1fr; }
    .article-nav { grid-template-columns: 1fr; }
    .scene-grid { grid-template-columns: 1fr; }
    .controls { grid-template-columns: auto 1fr auto; gap: 10px; }
    .controls .volume, .controls .fullscreen { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-intro { grid-column: 1 / -1; }
    .copyright { display: block; }
}

@media (max-width: 440px) {
    .video-grid { grid-template-columns: 1fr; }
    .creator-strip { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .poster-row { grid-template-columns: 1fr; }
    .poster-card:nth-child(2) { display: none; }
}