:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #18181b;
  --muted: #52525b;
  --faint: #a1a1aa;
  --line: #e4e4e7;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #09090b;
    --surface: #18181b;
    --text: #fafafa;
    --muted: #a1a1aa;
    --faint: #71717a;
    --line: #27272a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

h1 { font-size: 26px; line-height: 1.35; margin: 0 0 6px; }
h2 { font-size: 17px; margin: 32px 0 8px; }
p, li { color: var(--muted); }
ul { padding-left: 1.2em; margin: 8px 0; }
a { color: var(--text); }

.meta { color: var(--faint); font-size: 13px; margin: 0 0 24px; }

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.brand img { width: 64px; height: 64px; border-radius: 15px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 4px 20px 12px;
  margin-top: 20px;
}

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 13px;
}

footer a { color: var(--faint); margin-right: 16px; }