:root {
  --bg: #0b0d12;
  --bg-card: #151922;
  --bg-card-hover: #1c212d;
  --border: #262d3a;
  --text: #e6e9ef;
  --text-dim: #8b94a7;
  --accent: #6ee7ff;
  --tag-bg: #1e2a38;
  --tag-text: #7fd4ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(
      1200px 600px at 50% -10%,
      #131a2a 0%,
      var(--bg) 60%
    )
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.lab-header {
  text-align: center;
  padding: 64px 24px 40px;
}

.lab-mark {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 16px rgba(110, 231, 255, 0.4));
}

.lab-header h1 {
  margin: 0;
  font-size: 32px;
  letter-spacing: -0.02em;
}

.lab-sub {
  margin: 8px 0 0;
  color: var(--text-dim);
  font-size: 14px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  display: block;
  padding: 18px 18px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s ease, border-color 0.15s ease,
    transform 0.15s ease;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
}

.card-tag {
  flex-shrink: 0;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
}

.card-desc {
  margin: 8px 0 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

.card-slug {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: var(--accent);
}

.empty {
  text-align: center;
  color: var(--text-dim);
  line-height: 1.8;
}

.empty code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 6px;
}

.lab-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid var(--border);
}