:root { --bg:#f6f1e7; --fg:#222; --muted:#666; --accent:#e8672a; --card:#fff; }
@media (prefers-color-scheme: dark) { :root { --bg:#1c1a17; --fg:#eee; --muted:#aaa; --card:#262320; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:16px/1.8 -apple-system,"Hiragino Sans","Noto Sans JP",sans-serif; }
main { max-width:720px; margin:0 auto; padding:32px 20px 64px; }
h1 { font-size:1.6rem; margin:0 0 8px; }
h2 { font-size:1.15rem; margin:32px 0 8px; }
h3 { font-size:1rem; margin:20px 0 4px; }
p, li { color:var(--fg); }
.muted { color:var(--muted); font-size:.9rem; }
a { color:var(--accent); }
nav { margin:16px 0 24px; display:flex; gap:16px; flex-wrap:wrap; }
.card { background:var(--card); border-radius:14px; padding:4px 20px 20px; }