:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --fg: #172033;
  --muted: #667085;
  --link: #2563eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1623;
    --fg: #e6ebf5;
    --muted: #9aa6bd;
    --link: #8ab4ff;
  }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.7;
}
main {
  box-sizing: border-box;
  max-width: 680px;
  margin: 0 auto;
  padding: 64px 24px;
}
.brand {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.08em;
}
h1 {
  margin: 4px 0 16px;
  font-size: 2rem;
}
ul {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
li + li {
  margin-top: 8px;
}
a {
  display: inline-block;
  min-height: 44px;
  line-height: 44px;
  color: var(--link);
  font-weight: 700;
}