:root { --fg:#1f2328; --muted:#59636e; --bg:#ffffff; --card:#f6f8fa; --accent:#c8102e; --border:#d1d9e0; }
@media (prefers-color-scheme: dark) { :root { --fg:#e6edf3; --muted:#9198a1; --bg:#0d1117; --card:#161b22; --accent:#ff6b7f; --border:#30363d; } }
* { box-sizing: border-box; }
body { margin:0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color:var(--fg); background:var(--bg); line-height:1.6; }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 32px; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:8px; }
header .brand { font-weight:700; font-size:1.15rem; color:var(--fg); text-decoration:none; }
nav a { color:var(--muted); text-decoration:none; margin-left:16px; }
nav a:hover { color:var(--accent); }
main { padding-top: 24px; padding-bottom: 48px; }
h1 { font-size: 2rem; line-height:1.2; margin: 16px 0 8px; }
h2 { font-size: 1.25rem; margin-top: 32px; }
.muted { color: var(--muted); }
.card { background:var(--card); border:1px solid var(--border); border-radius:10px; padding:16px 20px; margin:16px 0; }
code, .code { font-family: ui-monospace, Menlo, Consolas, monospace; background:var(--card); border:1px solid var(--border); border-radius:6px; padding:2px 6px; word-break: break-all; }
button { background:var(--accent); color:#fff; border:0; border-radius:8px; padding:8px 14px; font-size:0.95rem; cursor:pointer; }
a { color: var(--accent); }
footer { border-top:1px solid var(--border); padding-top:16px; padding-bottom:32px; font-size:0.9rem; color:var(--muted); }