:root { --bg: #f7f6f2; --text: #1d1d1f; --muted: #5d5d63; --accent: #3a46a8; }
@media (prefers-color-scheme: dark) { :root { --bg: #15151a; --text: #ececf1; --muted: #a3a3ad; --accent: #9aa5ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.8 -apple-system, "PingFang SC", "Noto Sans SC", "Helvetica Neue", sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 64px 16px 80px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 24px; }
h2 { font-size: 18px; margin: 32px 0 8px; }
p { margin: 0 0 16px; }
.en { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
footer { margin-top: 48px; font-size: 14px; color: var(--muted); }