:root{color:#0f172a;background:#f8fafc;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:linear-gradient(180deg,#eef2f7,#f8fafc 40%)}.page{max-width:860px;margin:0 auto;padding:28px 18px 34px}.header h1{margin:0 0 12px}.nav{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px}.nav a{text-decoration:none;border:1px solid #cbd5e1;background:#fff;border-radius:999px;color:#334155;padding:8px 14px;font-weight:600;font-size:14px}.nav a.active{border-color:#0f766e;color:#0f766e;background:#ecfdf5}.card{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:16px;margin-bottom:12px}.card h2,.card h3{margin-top:0}.card p,.card li{line-height:1.55}code{background:#f1f5f9;border-radius:6px;padding:2px 6px}