:root{--bg:#faf8f4;--fg:#25303a;--muted:#6a7681;--accent:#2f5d7c;--line:#e3ded5;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#171c21;--fg:#e8ecef;--muted:#9aa6b0;--accent:#8fb8d4;--line:#2a323a;--card:#1e252b}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Helvetica Neue",Arial,sans-serif}
.wrap{max-width:720px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line);padding:18px 0}
header .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
.brand{font-weight:600;font-size:1.1rem;color:var(--fg);text-decoration:none;letter-spacing:.02em}
nav a{margin-left:18px;color:var(--muted);text-decoration:none}
nav a:hover,nav a[aria-current]{color:var(--accent)}
a{color:var(--accent)}
main{padding:48px 0 64px}
h1{font-size:2rem;line-height:1.25;margin:0 0 .4em}
h2{font-size:1.25rem;margin:2em 0 .5em}
.lead{font-size:1.15rem;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:24px 0}
.card h3{margin:0 0 .3em}
.muted{color:var(--muted);font-size:.92rem}
ul{padding-left:1.3em}
footer{border-top:1px solid var(--line);padding:24px 0 40px;color:var(--muted);font-size:.9rem}
footer a{color:var(--muted)}