:root{--bg:#f8fafc;--surface:#ffffff;--text:#0f172a;--muted:#475569;--line:#e2e8f0;--primary:#2563eb;--primary-weak:#eff6ff;--success:#059669}
*{box-sizing:border-box}html,body{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.header{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:20}.header-inner{height:62px;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:800;font-size:20px;color:#111827}.logo span{color:var(--primary)}.nav a{margin-left:18px;color:#334155;font-weight:500}
.hero{padding:56px 0 30px}.eyebrow{display:inline-block;background:var(--primary-weak);color:#1d4ed8;border:1px solid #bfdbfe;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:600}.hero h1{font-size:46px;line-height:1.1;margin:14px 0 12px}.hero p{max-width:780px;color:var(--muted);font-size:18px;line-height:1.7}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.btn{display:inline-block;padding:11px 16px;border-radius:10px;border:1px solid #bfdbfe;background:var(--primary-weak);color:#1e3a8a;font-weight:600}.btn.primary{background:var(--primary);border-color:#1d4ed8;color:#fff}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0 6px}.metric{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px}.metric b{font-size:24px;display:block}.metric span{color:#64748b;font-size:13px}
.section{padding:26px 0}.section h2{font-size:30px;margin:0 0 8px}.section-sub{color:var(--muted);margin-bottom:14px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;box-shadow:0 1px 2px rgba(15,23,42,.03)}.card h3{margin:0 0 8px;font-size:20px}.card p{margin:0;color:var(--muted);line-height:1.6}.tag{display:inline-block;background:#ecfeff;color:#155e75;border:1px solid #a5f3fc;border-radius:999px;padding:3px 8px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.03em;margin-bottom:8px}
.article{display:grid;grid-template-columns:1fr 280px;gap:18px}.article-main{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px}.article-main h1{font-size:40px;line-height:1.15;margin:0 0 12px}.article-main h2{font-size:28px;margin:26px 0 8px}.article-main h3{font-size:20px;margin:18px 0 6px}.article-main p{color:#334155;line-height:1.75}.article-main ul,.article-main ol{padding-left:22px}.article-main li{margin:8px 0;color:#334155}.toc{position:sticky;top:80px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;height:max-content}.toc h4{margin:0 0 10px}.toc a{display:block;color:#475569;padding:6px 0;font-size:14px}
.kv{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}.kv .item{background:#f8fafc;border:1px solid var(--line);padding:12px;border-radius:10px}.kv .item b{display:block}
table{width:100%;border-collapse:collapse;margin:12px 0;border:1px solid var(--line)}th,td{border:1px solid var(--line);padding:9px 10px;text-align:left}th{background:#f8fafc}
pre{background:#0f172a;color:#cbd5e1;padding:12px;border-radius:10px;overflow:auto;border:1px solid #1e293b}
.footer{border-top:1px solid var(--line);margin-top:30px;background:#fff}.footer-inner{padding:16px 0;color:#64748b;font-size:14px}
@media (max-width:980px){.hero h1{font-size:38px}.metrics{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}.article{grid-template-columns:1fr}.toc{position:relative;top:0}}
@media (max-width:640px){.hero{padding-top:34px}.hero h1{font-size:31px}.hero p{font-size:16px}.metrics,.grid-3{grid-template-columns:1fr}.header-inner{height:56px}.nav a{margin-left:12px;font-size:14px}.article-main h1{font-size:30px}.article-main h2{font-size:24px}}