:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --accent-dim: #1f6feb;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
  line-height: 1.6;
}

header { margin-bottom: 2rem; }
header h1 { font-size: 2rem; margin-bottom: 0.25rem; }
.subtitle { color: var(--text-dim); margin-bottom: 1rem; }

.search-bar input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}
.search-bar input:focus { outline: none; border-color: var(--accent); }

.categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.cat-card {
  padding: 0.5rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
}
.cat-card:hover { border-color: var(--accent); }
.cat-card .count {
  background: var(--accent-dim);
  padding: 0.1rem 0.4rem;
  border-radius: 10px;
  font-size: 0.75rem;
  margin-left: 0.25rem;
}

.bookmark-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  transition: border-color 0.2s;
}
.bookmark-card:hover { border-color: var(--accent); }

.card-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.cat-badge {
  background: var(--accent-dim);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.date { color: var(--text-dim); font-size: 0.8rem; }

.bookmark-card h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.bookmark-card h3 a { color: var(--text); text-decoration: none; }
.bookmark-card h3 a:hover { color: var(--accent); }

.summary { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 0.5rem; }

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.source-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
}

.tags { color: var(--text-dim); font-size: 0.8rem; }

/* Detail page */
.detail .meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.detail blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--text-dim);
}

.detail .content {
  margin-top: 1.5rem;
}

.detail .content h2, .detail .content h3, .detail .content h4 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.detail .content p { margin-bottom: 0.75rem; }
.detail .content ul { margin: 0.5rem 0 0.75rem 1.5rem; }
.detail .content li { margin-bottom: 0.3rem; }

.cross-skills { margin: 0.5rem 0; }
.skill-link {
  background: var(--accent-dim);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.url a { color: var(--accent); word-break: break-all; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}

@media (max-width: 600px) {
  body { padding: 1rem 0.5rem; }
  header h1 { font-size: 1.5rem; }
  .categories { gap: 0.3rem; }
}