:root{--ink:#111827;--muted:#4b5563;--line:#e5e7eb;--bg:#f8f9fb;--card:#fff;--accent:#111827}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 16px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:20px;padding-bottom:20px}
header a.brand{font-weight:700;font-size:20px;color:var(--ink);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:16px;font-size:15px}
main{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:32px 24px;margin:0 auto 32px;width:calc(100% - 32px);max-width:728px}
h1{font-size:28px;line-height:1.25;margin:0 0 8px}
h2{font-size:19px;margin:28px 0 8px}
p,li{color:var(--muted)}
.updated{font-size:14px;margin-bottom:24px}
table{width:100%;border-collapse:collapse;margin:8px 0}
td,th{border:1px solid var(--line);padding:8px;text-align:left;font-size:15px}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;padding:12px 22px;border-radius:8px}
footer{color:var(--muted);font-size:14px;padding-bottom:32px}
footer a{color:var(--muted)}
@media (max-width:520px){nav a{margin-left:10px}main{padding:24px 16px}}