:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #2563eb;
  --card-bg: #ffffff;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: #fff;
  padding: 3.5rem 0 2.5rem;
}

.site-header h1 {
  margin: 0;
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

.site-header .tagline {
  margin: 0.5rem 0 0;
  opacity: 0.85;
  font-size: 1.1rem;
}

main {
  padding: 2.5rem 0 4rem;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.demo-card {
  display: block;
  padding: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.demo-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border-color: var(--accent);
}

.demo-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  color: var(--fg);
}

.demo-card p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.demo-card .demo-path {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  color: var(--accent);
  background: #eff6ff;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}