:root{--text:#172033;--muted:#667085;--line:#e6eaf2;--soft:#f6f8fc;--card:#fff;--accent:#1d4ed8;--accent-2:#f97316;--green:#16a34a;--shadow:0 18px 45px rgba(21,32,54,.08);--radius:22px}*{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:linear-gradient(180deg,#f7fbff 0%,#fff 38%,#f8fafc 100%);line-height:1.72}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}img{max-width:100%;display:block}.visually-hidden{position:absolute;clip:rect(1px,1px,1px,1px);padding:0;border:0;height:1px;width:1px;overflow:hidden}.site-header{background:rgba(255,255,255,.95);backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.topline{font-size:14px;text-align:center;padding:8px 16px;background:#0f172a;color:#e2e8f0}.brandbar{max-width:1180px;margin:auto;padding:22px 20px;display:flex;align-items:center;gap:24px;justify-content:space-between}.logo{display:flex;align-items:center;gap:12px;font-weight:900}.logo-mark{width:54px;height:54px;border-radius:16px;background:linear-gradient(135deg,#1d4ed8,#f97316);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow);letter-spacing:-1px}.logo-text{font-size:24px}.brand-slogan{margin:0;color:var(--muted);max-width:620px}.main-nav{max-width:1180px;margin:auto;display:flex;gap:8px;padding:0 20px 14px;overflow:auto}.main-nav a{white-space:nowrap;padding:10px 14px;border:1px solid var(--line);border-radius:999px;background:#fff;font-weight:700;font-size:14px}.main-nav a.active,.main-nav a:hover{background:#eff6ff;color:#1d4ed8;border-color:#bfdbfe}.search-panel{max-width:1180px;margin:0 auto 18px;padding:0 20px;display:grid;grid-template-columns:1fr auto;gap:10px}.search-panel input{border:1px solid var(--line);border-radius:16px;padding:13px 16px;font-size:15px;background:#fff}.search-panel 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var(--line);border-radius:34px;padding:24px;box-shadow:var(--shadow)}.hero-card h2,.section-title h2{margin:0 0 10px}.section-title{display:flex;justify-content:space-between;align-items:end;gap:20px;margin:34px 0 18px}.section-title p{margin:0;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid.two{grid-template-columns:repeat(2,1fr)}.grid.four{grid-template-columns:repeat(4,1fr)}.video-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(15,23,42,.05);transition:.25s transform,.25s box-shadow}.video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}.video-card figure{position:relative;margin:0;aspect-ratio:16/9;background:#0f172a;overflow:hidden}.video-card img,.fake-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.fake-video{opacity:0;z-index:1}.play-badge{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.86);width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.92);display:grid;place-items:center;color:#0f172a;font-weight:900;z-index:3;opacity:0;transition:.25s}.video-card:hover .play-badge,.video-card.is-preview .play-badge{opacity:1;transform:translate(-50%,-50%) scale(1)}.video-card figcaption{position:absolute;left:12px;right:12px;bottom:10px;background:rgba(15,23,42,.72);color:#fff;border-radius:12px;padding:6px 10px;font-size:12px;z-index:2}.card-body{padding:18px}.eyebrow{margin:0 0 8px;color:var(--accent-2);font-weight:900;font-size:13px}.card-body h3{margin:0 0 10px;line-height:1.35;font-size:20px}.card-body p{margin:0 0 12px;color:var(--muted)}.meta-row,.stats,.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.meta-row span,.stats span,.tags span{font-size:12px;border-radius:999px;padding:5px 9px;background:#f1f5f9;color:#475569}.stats span{background:#fff7ed;color:#9a3412}.tags span{background:#ecfdf5;color:#166534}.news-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:0 10px 30px rgba(15,23,42,.04)}.news-list article{border-bottom:1px solid var(--line);padding:14px 0}.news-list article:last-child{border-bottom:0}.news-list h3{margin:0 0 8px}.module-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.mini-module{padding:18px;border-radius:20px;background:#fff;border:1px solid var(--line)}.mini-module strong{display:block;font-size:28px;color:var(--accent)}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 10px 30px rgba(15,23,42,.04)}.topic{border-left:5px solid var(--accent);padding-left:16px}.author-card{display:flex;gap:14px;align-items:flex-start}.avatar{width:54px;height:54px;border-radius:18px;background:linear-gradient(135deg,#dbeafe,#fed7aa);display:grid;place-items:center;font-weight:900;color:#1e293b;flex:0 0 auto}.faq 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var(--accent);padding:14px 16px;border-radius:14px}.sidebar{display:grid;gap:18px;align-content:start}.sidebar .panel{position:sticky;top:190px}.toc a{display:block;padding:8px 0;border-bottom:1px solid var(--line);font-weight:700}.site-footer{margin-top:40px;background:#0f172a;color:#e2e8f0}.site-footer a{color:#fff}.footer-grid{max-width:1180px;margin:auto;padding:34px 20px;display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:24px}.footer-logo .logo-mark{box-shadow:none}.site-footer p{color:#cbd5e1}.copyright{max-width:1180px;margin:0 auto;padding:0 20px 26px;font-size:14px}.data-table{width:100%;border-collapse:collapse;background:#fff;border-radius:18px;overflow:hidden}.data-table th,.data-table td{padding:12px;border-bottom:1px solid var(--line);text-align:left}.data-table th{background:#f8fafc}.notice{background:#eff6ff;border:1px solid #bfdbfe;border-radius:18px;padding:16px;color:#1e40af}.cta{background:linear-gradient(135deg,#fff7ed,#eff6ff);border:1px solid 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@media (max-width:640px){.grid,.grid.two,.grid.four,.module-strip,.footer-grid{grid-template-columns:1fr}.container{padding:20px 14px}.search-panel{grid-template-columns:1fr}.hero-copy h1{font-size:34px}.logo-text{font-size:20px}.main-nav{padding-left:14px}.article-main{padding:20px}.footer-grid{padding:26px 14px}}