:root {
  --max-width: 760px;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #5b6470;
  --accent: #2563eb;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px 96px;
}

header.site-header {
  border-bottom: 1px solid var(--border);
}

header.site-header .container {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}

nav a:hover, nav a:focus { color: var(--accent); }

h1 { font-size: 1.8rem; margin-bottom: 4px; }
h2 { font-size: 1.2rem; margin-top: 2.2em; }

.updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2em;
}

section p { margin: 0 0 1em; white-space: pre-line; }

.card-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr 1fr;
  margin-top: 2em;
}

@media (max-width: 560px) {
  .card-grid { grid-template-columns: 1fr; }
}

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  text-decoration: none;
  color: var(--fg);
}

.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; white-space: normal; }

footer {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 3em;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}