:root {
  color-scheme: light dark;
  --bg: #f8f9fa;
  --fg: #202124;
  --muted: #5f6368;
  --card: #ffffff;
  --line: #dadce0;
  --accent: #1f57c3;
  --accent-fg: #ffffff;
  --disabled-bg: #e8eaed;
  --disabled-fg: #5f6368;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #202124;
    --fg: #e8eaed;
    --muted: #9aa0a6;
    --card: #2b2c2f;
    --line: #3c4043;
    --accent: #8ab4f8;
    --accent-fg: #202124;
    --disabled-bg: #3c4043;
    --disabled-fg: #9aa0a6;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main, header.top, footer { max-width: 44rem; margin: 0 auto; padding: 0 16px; }
header.top { padding-top: 24px; display: flex; align-items: center; gap: 12px; }
header.top img { width: 40px; height: 40px; }
header.top a.brand { color: var(--fg); font-weight: 600; font-size: 1.15rem; text-decoration: none; }
main { padding-top: 24px; padding-bottom: 32px; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
h2.first { margin-top: 0; }
h3 { font-size: 1.05rem; margin: 24px 0 8px; }
p, ul, ol { margin: 0 0 12px; }
ul, ol { padding-left: 1.4em; }
li { margin-bottom: 4px; }
a { color: var(--accent); }
.lead { font-size: 1.1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin: 20px 0; }
.sites { columns: 2 12rem; margin: 0; padding-left: 1.2em; }
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  background: var(--accent);
  color: var(--accent-fg);
}
.btn[aria-disabled="true"] { background: var(--disabled-bg); color: var(--disabled-fg); cursor: not-allowed; }
.btn:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.note { color: var(--muted); font-size: 0.9rem; }
footer { padding-top: 16px; padding-bottom: 40px; color: var(--muted); font-size: 0.9rem; border-top: 1px solid var(--line); }