:root {
  --bg: #f7f7f5;
  --fg: #1d1d1f;
  --muted: #5f6368;
  --card: #ffffff;
  --border: #dcdcd8;
  --accent: #2257c5;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --fg: #ececee;
    --muted: #a0a3a8;
    --card: #1e1f22;
    --border: #34353a;
    --accent: #8ab0ff;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.6;
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.8rem;
}

.lead {
  margin: 0 0 2rem;
  color: var(--muted);
}

.tools {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tools a {
  display: block;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--card);
  color: inherit;
  text-decoration: none;
}

.tools a:hover,
.tools a:focus-visible {
  border-color: var(--accent);
}

.tool__title {
  display: block;
  color: var(--accent);
  font-weight: 600;
  font-size: 1.1rem;
}

.tool__description {
  display: block;
  color: var(--muted);
}