:root { --bg:#f6f7fb; --card:#fff; --text:#1c1c1e; --muted:#6e6e73; --accent:#3b5bdb; }
@media (prefers-color-scheme: dark) { :root { --bg:#000; --card:#1c1c1e; --text:#f2f2f7; --muted:#98989d; --accent:#7b93ff; } }
* { box-sizing:border-box; }
body { margin:0; font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,sans-serif; background:var(--bg); color:var(--text); line-height:1.6; }
main { max-width:680px; margin:0 auto; padding:32px 20px 64px; }
header { display:flex; align-items:center; gap:14px; margin-bottom:28px; }
header .logo { width:56px; height:56px; border-radius:14px; background:var(--accent); color:#fff; display:flex; align-items:center; justify-content:center; font-size:28px; font-weight:700; }
header h1 { margin:0; font-size:26px; }
header p { margin:0; color:var(--muted); font-size:14px; }
nav a { color:var(--accent); text-decoration:none; margin-right:16px; font-size:14px; }
.card { background:var(--card); border-radius:16px; padding:22px 24px; margin:18px 0; box-shadow:0 1px 3px rgba(0,0,0,.06); }
h2 { font-size:18px; margin:0 0 8px; }
h3 { font-size:15px; margin:18px 0 4px; }
p, li { font-size:15px; }
a { color:var(--accent); }
footer { color:var(--muted); font-size:13px; margin-top:32px; }
.button { display:inline-block; background:var(--accent); color:#fff !important; padding:10px 18px; border-radius:12px; text-decoration:none; font-weight:600; }