:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1a1d21;
  --muted: #5c6670;
  --accent: #0b6bcb;
  --border: #d8dee4;
  --max-width: 42rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

.page {
  min-height: 100vh;
  padding: 2rem 1rem 3rem;
}

.shell {
  max-width: var(--max-width);
  margin: 0 auto;
}

.brand {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.75rem 1.5rem;
  box-shadow: 0 8px 24px rgba(16, 24, 40, 0.06);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  line-height: 1.25;
}

.meta {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

h2 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.1rem;
}

p,
ol,
ul {
  margin: 0 0 1rem;
}

ol,
ul {
  padding-left: 1.25rem;
}

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

.nav {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}

@media (min-width: 640px) {
  .page {
    padding: 3rem 1.5rem 4rem;
  }

  .card {
    padding: 2rem 2.25rem;
  }
}