:root{--bg:#f6f7fb;--card:#fff;--text:#1e293b;--muted:#64748b;--line:#e2e8f0;--brand:#111827;--soft:#eef2ff;--radius:18px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.wrap{width:min(1180px,94vw);margin:auto}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 0}.logo{display:flex;align-items:center;gap:10px;font-weight:900;color:var(--brand);text-decoration:none}.logo-mark{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#111827,#475569);display:grid;place-items:center;color:#fff;font-size:20px}.nav{display:flex;gap:6px;flex-wrap:wrap}.nav a{color:#334155;text-decoration:none;padding:8px 12px;border-radius:999px;font-size:14px}.nav a:hover{background:var(--soft);color:#111827}.searchbar{display:grid;grid-template-columns:1fr auto;gap:10px;padding:0 0 14px}.searchbar input{border:1px solid var(--line);border-radius:14px;padding:12px 14px;font-size:15px}.btn{border:0;border-radius:14px;background:#111827;color:#fff;padding:12px 18px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.hero{padding:36px 0 20px}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px}.hero-card,.card,.module{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 28px rgba(15,23,42,.06)}.hero-card{padding:26px}.eyebrow{color:#475569;font-weight:700}.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.1;margin:8px 0 14px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:20px}.stat{background:#f8fafc;border-radius:14px;padding:12px;text-align:center}.stat strong{display:block;font-size:22px}.side-list{padding:18px}.side-list h2{margin:0 0 12px}.hot-link{display:block;padding:12px 0;border-top:1px solid var(--line);text-decoration:none;color:var(--text)}.section{padding:22px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:14px}.section-head h1,.section-head h2{margin:0;font-size:26px}.section-head p{margin:4px 0 0;color:var(--muted)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{overflow:hidden}.card-body{padding:16px}.thumb{position:relative;aspect-ratio:16/9;background:#dbeafe;overflow:hidden}.thumb img{width:100%;height:100%;object-fit:cover;display:block}.play{position:absolute;inset:0;display:grid;place-items:center;background:rgba(15,23,42,.22);opacity:0;transition:.2s}.card:hover .play{opacity:1}.play span{width:58px;height:58px;border-radius:999px;background:#fff;display:grid;place-items:center;font-weight:900}.meta,.tags,.actions{display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:13px}.tag{background:#f1f5f9;border-radius:999px;padding:3px 9px}.actions button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 10px;cursor:pointer}.module{padding:18px}.module ul{padding-left:18px}.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin:10px 0;padding:12px}.comment{padding:14px;border-bottom:1px solid var(--line)}.site-footer{margin-top:30px;background:#111827;color:#e5e7eb;padding:30px 0}.site-footer a{color:#fff}.footer-grid{display:grid;grid-template-columns:1.3fr .7fr .7fr;gap:20px}.breadcrumb{color:var(--muted);font-size:14px;margin:18px 0}.notice{background:#ecfeff;border:1px solid #a5f3fc;border-radius:14px;padding:12px}.video-frame{width:100%;aspect-ratio:16/9;background:#0f172a;border-radius:18px;display:grid;place-items:center;color:#fff}@media(max-width:860px){.hero-grid,.grid-3,.footer-grid{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.topbar{align-items:flex-start;gap:12px;flex-direction:column}.nav{width:100%}.searchbar{grid-template-columns:1fr}.section-head{align-items:flex-start;flex-direction:column}}