:root {
  color-scheme: dark;
  --bg: #0b0e26;
  --panel: #121735;
  --text: #e8eaf0;
  --muted: #9aa3b8;
  --accent: #60a8f8;
  --border: #2a3158;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.55;
  color: var(--text);
  background: radial-gradient(ellipse at top, #151b3d 0%, var(--bg) 55%);
  min-height: 100vh;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 0.25rem;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

.lead { font-size: 1.05rem; }

.note, .updated {
  color: var(--muted);
  font-size: 0.95rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover { text-decoration: underline; }

.back { color: var(--muted); }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}