:root{--bg:#f7f8fc;--fg:#1a2340;--muted:#5b6275;--accent:#3659c9;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#121626;--fg:#e8ebf5;--muted:#a3a9bb;--accent:#8fa8ff;--card:#1b2135}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 16px 64px}
header{display:flex;align-items:center;gap:12px;margin-bottom:24px}header img{width:48px;height:48px;border-radius:12px}
header a{color:inherit;text-decoration:none;font-weight:800;font-size:22px}
h1{font-size:28px;line-height:1.25;margin:8px 0 16px}h2{font-size:20px;margin:32px 0 8px}h3{font-size:17px;margin:20px 0 6px}
p,li{color:var(--fg)}.muted{color:var(--muted)}a{color:var(--accent)}
.card{background:var(--card);border-radius:16px;padding:20px;margin:16px 0;box-shadow:0 1px 4px rgba(0,0,0,.06)}
nav.lang a{margin-right:12px}footer{margin-top:48px;color:var(--muted);font-size:14px}footer a{color:var(--muted);margin-right:14px}
.todo{background:#fff3cd;color:#664d03;padding:2px 6px;border-radius:6px}