:root{--bg:#f6f8f9;--fg:#15232b;--muted:#5b6b73;--accent:#12a57f;--card:#fff;--line:#e3e8eb}
@media (prefers-color-scheme:dark){:root{--bg:#0f171b;--fg:#e8eef1;--muted:#9aabb3;--card:#172228;--line:#24333a}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 64px}
header{display:flex;align-items:center;gap:16px;margin-bottom:24px}header img{width:64px;height:64px;border-radius:14px}
h1{font-size:28px;margin:0}h2{font-size:20px;margin:32px 0 8px}p,li{color:var(--fg)}.muted{color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin:16px 0}
a{color:var(--accent)}nav{margin-top:40px;font-size:14px}footer{margin-top:40px;font-size:13px;color:var(--muted)}