:root{color-scheme:light;--bg:#fafbf8;--surface:#fff;--text:#192d45;--muted:#526379;--border:#d8e1ec;--accent:#2563eb;--accent-dark:#1d4ed8;--soft:#edf3ff;--warning:#fff7ed;--warning-border:#fed7aa}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 50% 0,#e9f1ff 0,transparent 48%),var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.62}.site-header{max-width:1080px;margin:auto;padding:22px clamp(20px,5vw,48px);display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{font-size:24px;font-weight:780;letter-spacing:-.03em;text-decoration:none;color:var(--text)}.brand span{color:var(--accent)}.back{color:var(--muted);text-decoration:none;font-size:14px}.back:hover{color:var(--accent)}main{max-width:820px;margin:0 auto;padding:38px 20px 80px}.eyebrow{font-size:12px;font-weight:800;letter-spacing:.15em;color:var(--accent);margin:0 0 10px}h1{font-size:clamp(34px,5vw,52px);line-height:1.08;letter-spacing:-.04em;margin:0 0 16px}h2{font-size:23px;line-height:1.25;margin:36px 0 12px}h3{font-size:17px;margin:22px 0 7px}.intro{font-size:18px;color:var(--muted);margin:0;max-width:720px}.updated{font-size:14px;color:var(--muted);margin:20px 0 30px}.notice{margin:28px 0;padding:16px 18px;border:1px solid var(--warning-border);background:var(--warning);border-radius:12px}.notice strong{display:block;margin-bottom:4px}.card{padding:clamp(22px,4vw,36px);border:1px solid var(--border);border-radius:18px;background:var(--surface);box-shadow:0 10px 32px rgba(25,45,69,.055)}p,li{color:var(--muted)}li+li{margin-top:7px}a{color:var(--accent);text-underline-offset:2px}code{padding:2px 5px;background:var(--soft);border-radius:4px;font-size:.92em}footer{border-top:1px solid var(--border);padding:30px 20px 46px;text-align:center;color:var(--muted);font-size:14px}footer a{margin:0 8px}.skip-link{position:absolute;top:-100px;left:16px;background:#fff;color:var(--text);padding:10px;z-index:2}.skip-link:focus{top:16px}@media(max-width:600px){.site-header{padding:18px 20px}.card{border-radius:14px}main{padding-top:24px}}