:root{--bg:#ffffff;--fg:#1a1a1a;--muted:#5c5c5c;--line:#e5e5e5;--accent:#0b3d91;--soft:#f5f7fb}
@media (prefers-color-scheme:dark){:root{--bg:#121212;--fg:#ececec;--muted:#a6a6a6;--line:#2a2a2a;--accent:#7fa8ff;--soft:#1b1d22}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent)}
.wrap{max-width:820px;margin:0 auto;padding:0 16px}
header.top{border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding-top:16px;padding-bottom:16px}
.brand{font-weight:700;font-size:1.15rem;text-decoration:none;color:var(--fg)}
nav a{margin-left:16px;font-size:.95rem;text-decoration:none}
nav a:first-child{margin-left:0}
main{padding:32px 0 48px}
h1{font-size:1.9rem;line-height:1.25;margin:0 0 8px}
h2{font-size:1.25rem;margin:32px 0 8px}
h3{font-size:1.05rem;margin:20px 0 6px}
.meta{color:var(--muted);font-size:.9rem;margin-bottom:24px}
.box{background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:16px 20px;margin:16px 0}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:24px}
.card{border:1px solid var(--line);border-radius:8px;padding:20px;text-decoration:none;color:var(--fg)}
.card strong{display:block;color:var(--accent);margin-bottom:4px}
ol li,ul li{margin-bottom:6px}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem;padding:24px 0 40px}
footer p{margin:4px 0}
footer .links a{margin-right:16px;display:inline-block}