:root{--bg:#f5f7fb;--fg:#1b2430;--mut:#5b6675;--acc:#1f6fd1;--card:#fff;--line:#e2e6ec}
@media (prefers-color-scheme:dark){:root{--bg:#11151b;--fg:#e2e7ee;--mut:#9aa5b3;--acc:#5fb3ff;--card:#1a2028;--line:#2a313b}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif}
header{background:#1f6fd1;color:#fff;padding:18px 16px}header .w{max-width:760px;margin:auto;display:flex;align-items:center;gap:12px}
header img{width:40px;height:40px;border-radius:9px;background:#fff;padding:3px}header a{color:#fff;text-decoration:none;font-weight:600}
main{max-width:760px;margin:24px auto;padding:0 16px 48px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin-bottom:16px}
h1{font-size:28px;margin:.2em 0 .3em}h2{font-size:19px;margin:1.4em 0 .4em}a{color:var(--acc)}.mut{color:var(--mut);font-size:14px}
footer{max-width:760px;margin:0 auto 40px;padding:0 16px;color:var(--mut);font-size:13px}