:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #2563eb;
  --card: #f5f5f7;
  --border: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0d;
    --fg: #f2f2f7;
    --muted: #9a9aa0;
    --card: #1c1c1e;
    --border: #2c2c2e;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.hero {
  padding: 48px 24px 24px;
  max-width: 760px;
  margin: 0 auto;
}
.hero h1 {
  font-size: 2rem;
  margin: 8px 0;
}
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
}
.footer {
  max-width: 760px;
  margin: 48px auto 32px;
  padding: 0 24px;
  color: var(--muted);
  font-size: 0.9rem;
}
.app-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .app-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.app-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  color: inherit;
}
.app-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  transition: transform 0.15s;
}
.app-card h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}
.app-card p {
  margin: 0 0 12px;
  color: var(--muted);
}
.platform {
  font-size: 0.75rem;
  background: var(--accent);
  color: white;
  padding: 2px 8px;
  border-radius: 999px;
}
.prose h2 {
  margin-top: 32px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}
.prose h3 {
  margin-top: 20px;
}
.prose ul {
  padding-left: 1.4em;
}