:root{--ink:#111827;--muted:#4b5563;--line:#e5e7eb;--bg:#f4f6f8;--card:#ffffff;--accent:#1d4ed8;--accent-ink:#ffffff}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif}
a{color:var(--accent)}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
header.site{background:var(--card);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px}
.brand{font-weight:800;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
nav a{margin-left:18px;text-decoration:none;font-weight:600}
.hero{padding:48px 0 24px}
.hero h1{font-size:clamp(28px,5vw,40px);line-height:1.15;margin:0 0 12px;letter-spacing:-.02em}
.hero p{font-size:18px;color:var(--muted);margin:0 0 20px;max-width:640px}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);padding:11px 18px;border-radius:8px;font-weight:700;text-decoration:none}
.btn.secondary{background:transparent;color:var(--accent);border:1px solid var(--accent);margin-left:10px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px 26px;margin:18px 0}
.card h2{margin:0 0 10px;font-size:20px}
.card ul,.card ol{margin:8px 0 0;padding-left:22px}
.card li{margin:6px 0}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:700px){.grid{grid-template-columns:1fr}.btn.secondary{margin:10px 0 0}}
dt{font-weight:700;margin-top:16px}
dd{margin:4px 0 0;color:var(--muted)}
.note{color:var(--muted);font-size:14px}
footer.site{margin:40px 0 28px;color:var(--muted);font-size:14px}
:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}