:root {
  --bg: #0f1114;
  --surface: #171a1f;
  --text: #e8eaed;
  --muted: #9aa0a6;
  --accent: #c9a227;
  --border: #2a2f36;
  --safe: #4caf50;
  --euclid: #ff9800;
  --keter: #f44336;
  --thaumiel: #9c27b0;
  --neutralized: #607d8b;
  --explained: #2196f3;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--text); }

main.container { padding: 2rem 1.25rem 4rem; }

.lead, .section-intro { color: var(--muted); font-size: 1.05rem; }

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.card {
  display: block;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
}

.card:hover { border-color: var(--accent); text-decoration: none; }
.card h2 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.entry-list { list-style: none; padding: 0; margin: 1rem 0; }
.entry-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.entry-list a { color: var(--text); font-weight: 600; }
.entry-list .summary { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.95rem; }

.entry-id {
  font-family: Consolas, "Courier New", monospace;
  color: var(--accent);
  margin-right: 0.5rem;
}

.class {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.class-safe { background: rgba(76, 175, 80, 0.2); color: var(--safe); }
.class-euclid { background: rgba(255, 152, 0, 0.2); color: var(--euclid); }
.class-keter { background: rgba(244, 67, 54, 0.2); color: var(--keter); }
.class-thaumiel { background: rgba(156, 39, 176, 0.2); color: var(--thaumiel); }
.class-neutralized { background: rgba(96, 125, 139, 0.2); color: var(--neutralized); }
.class-explained { background: rgba(33, 150, 243, 0.2); color: var(--explained); }

.entry-header { margin-bottom: 2rem; }
.entry-header h1 { margin: 0.5rem 0 1rem; font-size: 2rem; }

.cover img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.tags { margin-top: 1rem; }
.tag {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  margin: 0 0.35rem 0.35rem 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
}

.entry-body h2, .entry-body h3 { margin-top: 2rem; }
.entry-body blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  color: var(--muted);
}

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

.section-header { margin-bottom: 1.5rem; }
.section-header h1 { margin-bottom: 0.5rem; }

@media (max-width: 600px) {
  .site-header .container { flex-direction: column; align-items: flex-start; padding-top: 0.75rem; padding-bottom: 0.75rem; }
  .entry-header h1 { font-size: 1.5rem; }
}