:root{--bg:#f7f9fc;--fg:#101828;--muted:#475467;--card:#fff;--line:#e4e7ec;--accent:#1570ef}
@media (prefers-color-scheme:dark){:root{--bg:#0c111d;--fg:#f5f5f6;--muted:#a4a7ae;--card:#161b26;--line:#1f242f;--accent:#53b1fd}}
*{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:820px;margin:0 auto;padding:32px 16px 64px}h1{font-size:28px;line-height:1.25;margin:0 0 4px}h2{font-size:19px;margin:28px 0 8px}
.meta{color:var(--muted);font-size:14px;margin-bottom:24px}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:16px 0}
a{color:var(--accent)}ul{padding-left:20px}nav{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:20px;font-size:14px}hr{border:0;border-top:1px solid var(--line);margin:40px 0}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:12px 18px;border-radius:10px;font-weight:600}