:root{--fg:#1a1d23;--muted:#6b7280;--line:#e5e7eb;--accent:#1e3a5f;--bg:#fff;--card:#f9fafb}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.65;-webkit-text-size-adjust:100%}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:hsla(0,0%,100%,.9);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 20px}.brand{font-weight:800;letter-spacing:-.4px;color:var(--fg);text-decoration:none;font-size:18px}nav{display:flex;gap:16px;flex-wrap:wrap}nav a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:600}nav a:hover{color:var(--accent)}.wrap{max-width:760px;margin:0 auto;padding:32px 20px 72px}h1{font-size:26px;letter-spacing:-.4px;margin:0 0 6px}h2{font-size:18px;margin:26px 0 8px}li,p{font-size:15px}.sub{color:var(--muted);font-size:14px;margin:0 0 20px}ol,ul{padding-left:22px}li{margin:6px 0}a{color:var(--accent)}code{background:#eef0f4;padding:1px 5px;border-radius:5px;font-size:13px}.card{display:block;border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:inherit;background:var(--card);margin-bottom:12px;transition:border-color .15s ease}.card:hover{border-color:var(--accent)}.card h3{margin:0 0 4px;font-size:16px}.card p{margin:0;color:var(--muted);font-size:14px}.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:12px 18px;border-radius:12px;font-weight:700;font-size:15px}.btn:hover{opacity:.92}.box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:12px 0;font-size:14px}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:13px;text-align:center;padding:24px 20px}