:root {
  --bg: #f8fbff;
  --panel: rgba(255, 255, 255, 0.82);
  --text: #141b2f;
  --muted: #61708a;
  --line: rgba(122, 136, 170, 0.18);
  --pink: #ff4fc8;
  --blue: #61d6ff;
  --violet: #7b61ff;
  --mint: #36d8b7;
  --shadow: 0 24px 80px rgba(66, 76, 125, 0.18);
  --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 16% 8%, rgba(255, 79, 200, 0.18), transparent 26rem),
    radial-gradient(circle at 84% 4%, rgba(97, 214, 255, 0.2), transparent 28rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 48%, #ffffff 100%);
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
.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-header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(18px); background: rgba(255,255,255,0.86); border-bottom: 1px solid var(--line); }
.domain-ribbon { display: flex; justify-content: center; gap: 10px; align-items: center; min-height: 34px; font-size: 13px; color: #fff; background: linear-gradient(90deg, var(--pink), var(--blue), var(--violet)); }
.domain-ribbon strong { letter-spacing: .02em; }
.top-nav { width: min(1180px, calc(100% - 32px)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 12px 0; }
.brand-logo { display: inline-flex; align-items: center; filter: drop-shadow(0 16px 32px rgba(123, 97, 255, .13)); }
.brand-logo img { height: 54px; width: auto; }
.nav-menu { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.nav-menu a { padding: 10px 13px; border-radius: 999px; color: #34405b; font-weight: 700; font-size: 14px; transition: .25s ease; }
.nav-menu a:hover, .nav-menu a.is-active { background: linear-gradient(120deg, rgba(255,79,200,.15), rgba(97,214,255,.18)); color: #10172a; box-shadow: inset 0 0 0 1px rgba(255,255,255,.65); }
.nav-toggle { display: none; border: 0; background: #10172a; color: #fff; padding: 10px 14px; border-radius: 999px; font-weight: 800; }
.fake-search { width: min(980px, calc(100% - 32px)); margin: 0 auto 14px; display: grid; grid-template-columns: 1fr auto; gap: 10px; position: relative; }
.fake-search input { border: 1px solid var(--line); border-radius: 18px; min-height: 48px; padding: 0 18px; font-size: 15px; outline: none; background: rgba(255,255,255,.9); box-shadow: 0 12px 42px rgba(69, 90, 143, .08); }
.fake-search input:focus { border-color: rgba(255,79,200,.42); box-shadow: 0 0 0 4px rgba(255,79,200,.08); }
.fake-search button, .btn { border: 0; border-radius: 18px; min-height: 48px; padding: 0 20px; font-weight: 900; cursor: pointer; }
.fake-search button, .btn.primary { background: linear-gradient(120deg, var(--pink), var(--blue)); color: #fff; box-shadow: 0 16px 40px rgba(255, 79, 200, 0.23); }
.btn.ghost { display: inline-flex; align-items: center; justify-content: center; background: rgba(255,255,255,.72); color: #1c2744; border: 1px solid var(--line); }
.search-tip { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; text-align: center; }
main { overflow: hidden; }
.hero { width: min(1180px, calc(100% - 32px)); margin: 44px auto 28px; display: grid; grid-template-columns: 0.93fr 1.07fr; gap: 34px; align-items: center; }
.eyebrow { margin: 0 0 12px; color: var(--violet); font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.12; margin: 0; }
h1 { font-size: clamp(38px, 6vw, 72px); letter-spacing: -0.06em; }
h2 { font-size: clamp(28px, 4vw, 46px); letter-spacing: -0.04em; }
h3 { font-size: 21px; }
.hero-text { font-size: 18px; color: var(--muted); line-height: 1.8; margin: 20px 0 26px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; }
.hero-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 28px 0 0; }
.hero-metrics div { margin: 0; padding: 16px; border-radius: 22px; background: rgba(255,255,255,.74); border: 1px solid var(--line); box-shadow: 0 12px 40px rgba(38, 55, 104, .08); }
.hero-metrics dt { color: var(--muted); font-size: 13px; }
.hero-metrics dd { margin: 6px 0 0; font-weight: 900; }
.hero-visual { position: relative; min-height: 460px; display: grid; place-items: center; }
.hero-card, .video-media { position: relative; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: #fff; }
.hero-card { transform: rotate(1.5deg); border: 1px solid rgba(255,255,255,.9); }
.hero-card::before, .video-media::before { content: ""; position: absolute; inset: -2px; background: linear-gradient(120deg, rgba(255,79,200,.38), rgba(97,214,255,.4), rgba(123,97,255,.28)); opacity: 0; transition: .28s ease; z-index: 1; pointer-events: none; }
.hero-card:hover::before, .video-card:hover .video-media::before, .video-card:focus-within .video-media::before { opacity: 1; }
.demo-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; pointer-events: none; }
.play-button { position: absolute; z-index: 4; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(.88); width: 72px; height: 72px; border-radius: 50%; border: 0; background: rgba(255,255,255,.9); color: var(--pink); box-shadow: 0 16px 46px rgba(18, 30, 62, .24); opacity: 0; transition: .25s ease; font-size: 26px; cursor: pointer; }
.hero-card:hover .play-button, .video-card:hover .play-button, .video-card:focus-within .play-button, .is-playing .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.floating-note { position: absolute; padding: 12px 16px; border-radius: 999px; background: rgba(255,255,255,.86); border: 1px solid var(--line); font-weight: 900; box-shadow: 0 18px 50px rgba(54, 74, 120, .16); animation: floaty 4.8s ease-in-out infinite; }
.note-one { left: 6%; top: 16%; }
.note-two { right: 2%; top: 28%; animation-delay: .9s; }
.note-three { left: 19%; bottom: 5%; animation-delay: 1.7s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
.section { width: min(1180px, calc(100% - 32px)); margin: 84px auto; }
.section-head { max-width: 830px; margin-bottom: 26px; }
.section-head p:not(.eyebrow) { color: var(--muted); line-height: 1.8; font-size: 16px; }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.video-card { border-radius: var(--radius); background: var(--panel); border: 1px solid rgba(255,255,255,.8); box-shadow: 0 18px 62px rgba(51,64,112,.12); overflow: hidden; transition: .26s ease; }
.video-card:hover { transform: translateY(-6px); }
.video-media { border-radius: 0; box-shadow: none; aspect-ratio: 16 / 9; }
.video-media img { width: 100%; height: 100%; object-fit: cover; }
.video-badge { position: absolute; z-index: 3; left: 14px; top: 14px; color: #fff; background: rgba(20,27,47,.62); backdrop-filter: blur(8px); padding: 7px 11px; border-radius: 999px; font-size: 13px; font-weight: 900; }
.video-body { padding: 18px; }
.video-body p { color: var(--muted); line-height: 1.7; min-height: 78px; }
.video-tags, .video-stats { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.video-tags span { color: #22304d; font-weight: 800; font-size: 12px; border-radius: 999px; padding: 6px 10px; background: rgba(97,214,255,.17); }
.video-stats { margin-top: 14px; color: #59667e; font-size: 13px; }
.community-zone, .ai-panel { position: relative; padding: 34px; border-radius: calc(var(--radius) + 8px); background: rgba(255,255,255,.58); border: 1px solid rgba(255,255,255,.82); box-shadow: var(--shadow); }
.topic-grid, .ai-grid, .expert-grid, .review-grid, .content-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.topic-card, .ai-grid article, .expert-card, .review-card, .content-card, .join-guide, .faq-list details { background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: 24px; padding: 20px; box-shadow: 0 12px 42px rgba(69, 90, 143, .08); }
.topic-card p, .ai-grid p, .expert-card p, .review-card p, .content-card p { color: var(--muted); line-height: 1.72; }
.topic-card strong { display: inline-flex; margin-top: 8px; color: var(--pink); }
.danmaku-stage { margin-top: 20px; min-height: 92px; border-radius: 24px; overflow: hidden; position: relative; background: linear-gradient(120deg, rgba(20,27,47,.88), rgba(55,65,115,.82)); }
.danmaku-stage span { position: absolute; white-space: nowrap; color: #fff; font-weight: 900; filter: drop-shadow(0 3px 10px rgba(0,0,0,.25)); animation: danmaku 12s linear infinite; }
.danmaku-stage span:nth-child(1) { top: 16px; left: 100%; }
.danmaku-stage span:nth-child(2) { top: 50px; left: 110%; animation-delay: 1.9s; }
.danmaku-stage span:nth-child(3) { top: 22px; left: 120%; animation-delay: 3.8s; }
.danmaku-stage span:nth-child(4) { top: 58px; left: 130%; animation-delay: 5.5s; }
@keyframes danmaku { to { transform: translateX(-150vw); } }
.ai-grid { grid-template-columns: repeat(4, 1fr); }
.expert-grid { grid-template-columns: repeat(4, 1fr); }
.avatar { width: 58px; height: 58px; display: grid; place-items: center; color: #fff; font-weight: 900; font-size: 26px; border-radius: 20px; background: linear-gradient(135deg, var(--pink), var(--blue)); margin-bottom: 14px; }
.expert-card strong { display: block; color: var(--violet); margin-top: 8px; }
.review-grid { grid-template-columns: repeat(7, minmax(210px, 1fr)); overflow-x: auto; padding-bottom: 10px; }
.review-card { min-height: 210px; }
.review-card strong { display: block; margin-top: 16px; }
.review-card span { color: var(--muted); font-size: 13px; }
.partner-wall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.partner-wall img { border-radius: 20px; box-shadow: 0 12px 38px rgba(60,78,128,.1); }
.guide-faq { display: grid; grid-template-columns: .85fr 1.15fr; gap: 22px; margin-top: 22px; }
.join-guide ol { margin: 14px 0 0; padding-left: 20px; color: var(--muted); line-height: 1.85; }
.faq-list { display: grid; gap: 12px; }
details summary { cursor: pointer; font-weight: 900; }
details p { color: var(--muted); line-height: 1.75; }
.contact-strip { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 28px; padding: 32px; border-radius: calc(var(--radius) + 8px); background: linear-gradient(120deg, rgba(255,255,255,.88), rgba(233,247,255,.86)); border: 1px solid rgba(255,255,255,.85); box-shadow: var(--shadow); }
.contact-strip p { color: var(--muted); line-height: 1.75; }
.contact-strip a { color: var(--violet); font-weight: 900; }
.contact-strip img, .qr { border-radius: 24px; box-shadow: 0 18px 56px rgba(64, 74, 125, .13); }
.breadcrumb { width: min(1180px, calc(100% - 32px)); margin: 28px auto 0; color: var(--muted); display: flex; gap: 10px; font-size: 14px; }
.breadcrumb a { color: var(--violet); font-weight: 900; }
.inner-hero { width: min(1180px, calc(100% - 32px)); margin: 28px auto; padding: 54px; border-radius: 42px; background: linear-gradient(135deg, rgba(255,255,255,.92), rgba(235,247,255,.88)); border: 1px solid rgba(255,255,255,.88); box-shadow: var(--shadow); position: relative; overflow: hidden; }
.inner-hero::after { content: ""; position: absolute; right: -90px; top: -90px; width: 320px; height: 320px; border-radius: 50%; background: radial-gradient(circle, rgba(255,79,200,.28), transparent 62%); }
.inner-hero p { max-width: 780px; color: var(--muted); line-height: 1.82; font-size: 17px; }
.inner-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.compact-section { margin-top: 34px; }
.content-grid { grid-template-columns: repeat(2, 1fr); }
.content-card a { display: inline-flex; margin-top: 10px; color: var(--pink); font-weight: 900; }
.mini-grid { grid-template-columns: repeat(3, 1fr); }
.site-footer { position: relative; margin-top: 90px; padding: 56px 0 22px; background: #10172a; color: #fff; overflow: hidden; }
.footer-glow { position: absolute; inset: -120px -80px auto auto; width: 420px; height: 420px; background: radial-gradient(circle, rgba(255,79,200,.28), transparent 65%); pointer-events: none; }
.footer-grid { position: relative; width: min(1180px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: 1.2fr .7fr .7fr; gap: 32px; }
.footer-logo img { background: #fff; border-radius: 24px; padding: 2px; }
.site-footer p, .footer-links a { color: rgba(255,255,255,.72); line-height: 1.75; }
.site-footer h2 { font-size: 22px; margin-bottom: 14px; }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-domain strong { color: #fff; }
.footer-bottom { position: relative; width: min(1180px, calc(100% - 32px)); margin: 28px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); display: flex; flex-wrap: wrap; gap: 14px 24px; color: rgba(255,255,255,.68); font-size: 13px; }
@media (max-width: 1020px) {
  .hero { grid-template-columns: 1fr; }
  .video-grid, .mini-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-grid, .ai-grid, .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-wall { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .top-nav { align-items: flex-start; }
  .brand-logo img { height: 48px; }
  .nav-toggle { display: inline-flex; }
  .nav-menu { display: none; width: 100%; flex-basis: 100%; }
  .top-nav { flex-wrap: wrap; }
  .nav-menu.is-open { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .fake-search { grid-template-columns: 1fr; }
  .hero { margin-top: 26px; }
  .hero-visual { min-height: auto; }
  .hero-metrics { grid-template-columns: 1fr; }
  .video-grid, .mini-grid, .topic-grid, .ai-grid, .expert-grid, .content-grid { grid-template-columns: 1fr; }
  .community-zone, .ai-panel, .inner-hero { padding: 24px; border-radius: 28px; }
  .section { margin: 58px auto; }
  .guide-faq, .contact-strip { grid-template-columns: 1fr; }
  .partner-wall { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 38px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}