:root { --bg: #ffffff; --text: #1d1d1f; --muted: #6e6e73; --line: #e5e5ea; color-scheme: light; }
@media (prefers-color-scheme: dark) { :root { --bg: #111113; --text: #f5f5f7; --muted: #a1a1a6; --line: #2c2c2e; color-scheme: dark; } }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.7 -apple-system, "PingFang SC", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 28px; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 32px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
.meta { color: var(--muted); font-size: 14px; }
li { margin: 4px 0; }
header { position: sticky; top: 0; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); background: color-mix(in srgb, var(--bg) 80%, transparent); border-bottom: 1px solid var(--line); }
header > div { max-width: 720px; margin: 0 auto; padding: 0 16px; height: 52px; display: flex; align-items: center; gap: 8px; }
header img { width: 24px; height: 24px; }
header a.home { color: var(--text); font-weight: 600; display: flex; align-items: center; gap: 8px; }
a { color: #5b5bf7; text-decoration: none; }
.lang { margin-left: auto; display: inline-flex; padding: 2px; border-radius: 999px; border: 1px solid var(--line); font-size: 13px; line-height: 1; }
.lang a { padding: 6px 11px; border-radius: 999px; color: var(--muted); font-weight: 500; }
.lang a.on { background: linear-gradient(135deg, #5b5bf7, #8b5cf6); color: #fff; }