:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #1f9d55;
  --card: #f5f5f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: #2c2c2e;
    --accent: #30d158;
    --card: #1c1c1e;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 20px 64px; }
header { margin-bottom: 32px; }
header p { color: var(--muted); margin: 4px 0 0; }
h1 { font-size: 30px; line-height: 1.25; margin: 0; }
h2 { font-size: 21px; margin: 40px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 24px 0 4px; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; flex-wrap: wrap; font-size: 15px; margin-top: 12px; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.card { background: var(--card); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
.muted { color: var(--muted); font-size: 14px; }
.lang { margin-top: 56px; }
.logo { display: block; width: 72px; height: 72px; border-radius: 16px; margin-bottom: 16px; }
.beian { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); text-align: center; }
.beian a { color: var(--muted); text-decoration: none; }