:root{
  --bg:#f7f8fb;
  --card:#ffffff;
  --text:#172033;
  --muted:#667085;
  --line:#e7eaf0;
  --brand:#1747d1;
  --brand-dark:#102b7a;
  --soft:#eef3ff;
  --warm:#fff6e6;
  --danger:#bf2f2f;
  --shadow:0 16px 40px rgba(18,35,68,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.72}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.topbar{max-width:1200px;margin:auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--brand-dark)}
.domain-pill{font-size:14px;background:var(--soft);color:var(--brand-dark);padding:8px 12px;border-radius:999px}
.main-nav{max-width:1200px;margin:auto;padding:0 20px 12px;display:flex;gap:10px;flex-wrap:wrap}
.main-nav a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-weight:700;font-size:14px}
.main-nav a:hover{border-color:var(--brand);color:var(--brand)}
.search-box{max-width:1200px;margin:0 auto 14px;padding:0 20px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.search-box input{flex:1;min-width:220px;border:1px solid var(--line);border-radius:14px;padding:13px 15px;font-size:15px;background:#fff}
.search-box button,.btn,.video-actions button,.share-button{border:0;border-radius:14px;background:var(--brand);color:#fff;padding:12px 16px;font-weight:800;cursor:pointer}
.search-notice{margin:0;color:var(--muted);font-size:14px;min-height:22px}
main{max-width:1200px;margin:auto;padding:24px 20px 48px}
.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch;margin-top:8px}
.hero-card,.side-card,.module,.content-card,.author-card,.faq-card,.comment-card,.contact-card{background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:28px;padding:24px}
.hero-card{padding:34px;background:linear-gradient(135deg,#fff,#eef3ff)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--warm);color:#8a5a00;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:800}
h1{font-size:clamp(30px,5vw,52px);line-height:1.12;margin:18px 0 16px;color:var(--brand-dark)}
.hero p{color:var(--muted);font-size:17px;margin:0 0 18px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}
.btn.secondary{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px}
.stat strong{display:block;font-size:22px;color:var(--brand-dark)}
.stat span{color:var(--muted);font-size:13px}
.side-card h2{margin-top:0;color:var(--brand-dark)}
.hot-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.hot-list li{padding:12px;border-radius:16px;background:#f9fbff;border:1px solid var(--line)}
.meta-line{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:13px}
.section-title{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin:34px 0 16px}
.section-title h2{margin:0;color:var(--brand-dark);font-size:28px}
.section-title p{margin:4px 0 0;color:var(--muted)}
.more{font-weight:800;color:var(--brand)}
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.module h3,.content-card h3,.author-card h3{margin-top:0;color:var(--brand-dark)}
.module ul{padding-left:18px;margin-bottom:16px}
.heat{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.heat span{background:var(--soft);color:var(--brand-dark);border-radius:999px;padding:5px 9px;font-size:13px;font-weight:700}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.video-card{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);position:relative}
.video-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:#dfe6f8}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .28s ease}
.video-card:hover .video-thumb img{transform:scale(1.04)}
.play-badge{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.88);width:64px;height:64px;border-radius:50%;background:rgba(23,71,209,.9);display:grid;place-items:center;color:#fff;opacity:0;transition:.22s ease;box-shadow:0 12px 32px rgba(0,0,0,.2)}
.play-badge::before{content:"";margin-left:4px;border-left:18px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent}
.video-card:hover .play-badge{opacity:1;transform:translate(-50%,-50%) scale(1)}
.video-body{padding:18px}
.video-body p{color:var(--muted);margin:8px 0 12px}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.tags span{font-size:12px;padding:4px 8px;background:var(--soft);border-radius:999px;color:var(--brand-dark);font-weight:700}
.video-actions{display:flex;flex-wrap:wrap;gap:8px;border-top:1px solid var(--line);padding-top:12px}
.video-actions button{padding:8px 10px;background:#f3f5fb;color:var(--text);font-size:12px}
.video-actions button:hover{background:var(--brand);color:#fff}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.author-grid,.comment-grid,.faq-grid,.category-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.author-card .avatar{width:58px;height:58px;border-radius:18px;background:linear-gradient(135deg,#dfe6ff,#fff6e6);display:grid;place-items:center;font-weight:900;color:var(--brand);margin-bottom:10px}
.faq-card summary{font-weight:900;color:var(--brand-dark);cursor:pointer}
.faq-card p,.comment-card p,.contact-card p{color:var(--muted)}
.audit-box{background:#0f1d44;color:#fff;border-radius:28px;padding:24px;margin:28px 0;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.audit-box h2{grid-column:1/-1;margin:0 0 4px}
.audit-item{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:18px;padding:14px}
.breadcrumb{color:var(--muted);font-size:14px;margin-bottom:14px}
.breadcrumb a{color:var(--brand);font-weight:800}
.page-hero{background:#fff;border:1px solid var(--line);border-radius:28px;padding:30px;box-shadow:var(--shadow);margin-bottom:22px}
.page-hero h1{font-size:38px}
.timeline{display:grid;gap:14px}
.timeline article{background:#fff;border-left:4px solid var(--brand);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.form-panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)}
.form-panel label{display:block;font-weight:800;margin-top:12px}
.form-panel input,.form-panel textarea,.form-panel select{width:100%;border:1px solid var(--line);border-radius:14px;padding:12px;margin-top:6px;font:inherit}
.notice{background:#fff7ed;border:1px solid #fed7aa;color:#7c2d12;border-radius:18px;padding:14px;margin:14px 0}
.share-row{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.share-button{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.site-footer{background:#111827;color:#d1d5db;margin-top:20px}
.footer-grid{max-width:1200px;margin:auto;padding:34px 20px;display:grid;grid-template-columns:1.4fr .8fr 1fr;gap:24px}
.site-footer h2{font-size:18px;color:#fff}.site-footer a{display:block;color:#d1d5db;margin:8px 0}.copyright{border-top:1px solid rgba(255,255,255,.1);text-align:center;padding:16px 20px;color:#9ca3af}
@media (max-width: 900px){
  .hero,.two-col,.footer-grid{grid-template-columns:1fr}.module-grid,.video-grid,.audit-box{grid-template-columns:1fr 1fr}.author-grid,.comment-grid,.faq-grid,.category-grid{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr}.topbar{align-items:flex-start;flex-direction:column}.site-header{position:static}
}
@media (max-width: 560px){
  main{padding:18px 14px}.hero-card,.side-card,.module,.content-card,.author-card,.faq-card,.comment-card,.contact-card,.page-hero{border-radius:20px;padding:18px}.module-grid,.video-grid,.audit-box,.stats{grid-template-columns:1fr}.section-title{display:block}.search-box button{width:100%}.main-nav a{flex:1;text-align:center}.audit-box h2{grid-column:auto}
}