:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --link: #2563eb;
  --maxw: 720px;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f1a;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --link: #60a5fa;
    --shadow: 0 10px 30px rgba(0,0,0,0.35);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.65;
}

.container {
  max-width: var(--maxw);
  margin: 4rem auto;
  padding: 2rem;
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

@media (prefers-color-scheme: dark) {
  .container {
    background: rgba(17,24,39,0.5);
  }
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 2rem;
  letter-spacing: -0.01em;
}

.updated {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

h2 {
  margin-top: 2rem;
  font-size: 1.25rem;
}

ul {
  padding-left: 1.25rem;
}

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

a:hover { text-decoration: underline; }