:root{
  --bg:#f4f5f7; --surface:#fff; --text:#1f2937; --muted:#6b7280;
  --primary:#5b21b6; --primary2:#7c3aed; --dark:#111827;
  --border:#e5e7eb; --shadow:0 10px 30px rgba(17,24,39,.08);
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:linear-gradient(180deg,#f8f8fb 0%, #f2f4f8 100%);color:var(--text)}
a{color:var(--primary);text-decoration:none} img{max-width:100%;display:block}
.container{width:min(1120px,92%);margin:auto}
.topbar{background:linear-gradient(135deg,#0f172a 0%, #1f2937 60%, #2b1150 100%);color:#fff;position:sticky;top:0;z-index:20;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:18px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;font-weight:800;font-size:28px}
.topnav{display:flex;gap:18px;flex-wrap:wrap}.topnav a{color:#e5e7eb;font-size:14px;font-weight:700}
.page{padding:28px 0 50px}
.article-wrap{background:#fff;border-radius:24px;overflow:hidden;box-shadow:var(--shadow);border:1px solid rgba(229,231,235,.7)}
.hero{position:relative;background:linear-gradient(135deg,#1f2937 0%, #4c1d95 100%)} .hero img{width:100%;height:420px;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.06),rgba(0,0,0,.28))}
.hero-chip{position:absolute;left:28px;top:28px;display:inline-flex;align-items:center;padding:8px 14px;border-radius:999px;background:rgba(255,255,255,.92);color:var(--primary);font-size:13px;font-weight:800}
.article-body{padding:36px}
.breadcrumb{color:var(--muted);font-size:14px;margin-bottom:14px}.breadcrumb a{color:var(--muted)}
h1{font-size:42px;line-height:1.16;margin:0 0 10px;color:#111827;letter-spacing:-.6px}
.meta{display:flex;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:14px;margin-bottom:26px}
.meta span{padding:8px 12px;border:1px solid var(--border);border-radius:999px;background:#fafafa}
.lead{font-size:19px;line-height:1.9;color:#374151;margin-bottom:26px}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px}
.content h2{font-size:29px;line-height:1.25;margin:34px 0 12px;color:#111827}
.content h3{font-size:22px;line-height:1.35;margin:24px 0 10px}
.content p,.content li{font-size:18px;line-height:1.9;color:#374151}
.content ul,.content ol{padding-left:22px}
.note{padding:18px 20px;background:#f8f5ff;border-left:5px solid var(--primary);border-radius:14px;margin:20px 0}
.toc,.sidebar-card,.faq-card,.cta-box,.related{border:1px solid var(--border);background:#fafafa;border-radius:18px}
.toc{padding:20px;position:sticky;top:96px}.toc h3,.sidebar-card h3,.faq-card h2,.related h2{margin:0 0 14px;font-size:20px;color:#111827}
.toc ol{margin:0;padding-left:18px}.toc li{margin:8px 0;font-size:15px;line-height:1.5}
.sidebar-card{padding:20px;margin-top:18px}.stat{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px dashed var(--border);font-size:15px}.stat:last-child{border-bottom:0}
.cta-box{margin-top:30px;padding:24px;background:linear-gradient(135deg,#25124a 0%, #5b21b6 55%, #7c3aed 100%);color:#fff}
.cta-box h2{margin:0 0 10px;color:#fff}.cta-box p{margin:0 0 18px;color:#ede9fe;font-size:17px;line-height:1.7}
.cta-buttons{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.btn{display:inline-block;text-align:center;padding:16px 18px;border-radius:14px;font-weight:800}.btn-primary{background:#fff;color:#4c1d95}.btn-secondary{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.28)}
.faq-card{padding:24px;margin-top:34px}.faq-item{padding:14px 0;border-bottom:1px solid var(--border)}.faq-item:last-child{border-bottom:0}.faq-item h3{margin:0 0 8px;font-size:19px}
.related{padding:24px;margin-top:30px;background:#fff}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.related a{display:block;padding:16px;border:1px solid var(--border);border-radius:14px;background:#fafafa;color:#111827;font-weight:700;line-height:1.5}
.footer{margin-top:40px;background:#111827;color:#d1d5db;padding:28px 0;text-align:center}.footer p{margin:0;font-size:14px}
@media (max-width:960px){.content-grid{grid-template-columns:1fr}.toc{position:static}.hero img{height:320px}}
@media (max-width:768px){.topbar-inner{min-height:64px}.topnav{display:none}h1{font-size:32px}.article-body{padding:24px}.lead,.content p,.content li{font-size:16px}.content h2{font-size:25px}.cta-buttons,.related-grid{grid-template-columns:1fr}.hero img{height:240px}}