:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a5a5a;
  --link: #0060df;
  --border: #e2e2e2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #f0f0f0;
    --muted: #a0a0a0;
    --link: #6fb0ff;
    --border: #2a2c30;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2.5rem 1.5rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

main {
  max-width: 720px;
  margin: 0 auto;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

.subtitle {
  color: var(--muted);
  margin-top: 0;
  margin-bottom: 2rem;
}

a {
  color: var(--link);
}

.back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.app-section {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.app-section h2 {
  margin-top: 0;
}

.app-section ul {
  padding-left: 1.1rem;
  margin-bottom: 0;
}

.callout {
  background: var(--border);
  border-left: 3px solid var(--link);
  padding: 1rem 1.25rem;
  border-radius: 4px;
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1rem;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  font-weight: 700;
}

footer {
  margin-top: 3rem;
  color: var(--muted);
  font-size: 0.85rem;
}