:root { --bg:#f6f7f9; --surface:#fff; --text:#1d2330; --muted:#5d6675; --line:#d8dde5; --accent:#2f5bea; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg:#12151b; --surface:#1a1e26; --text:#e4e8ef; --muted:#9aa4b4; --line:#323a48; --accent:#7c9dff; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--text); font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 28px 16px 48px; }
article { background:var(--surface); border:1px solid var(--line); border-radius:14px; padding: 8px 24px 20px; }
h1 { font-size: 24px; } h2 { font-size: 18px; margin-top: 28px; }
a { color: var(--accent); }
.back { display:inline-block; margin-bottom: 14px; }
.todo { background: #fff4d6; color: #6b4b00; padding: 1px 6px; border-radius: 4px; }
blockquote { margin: 0; padding: 10px 16px; border-left: 4px solid var(--accent); background: color-mix(in srgb, var(--accent) 7%, transparent); border-radius: 0 8px 8px 0; }
.center { text-align:center; padding-top: 18vh; }