/* === Base === */
:root {
  --bg: #0a0a0a;
  --bg-card: #111111;
  --border: #2a2a2a;
  --text: #c8c8c8;
  --text-muted: #666;
  --green: #00ff41;
  --green-dim: #00aa2a;
  --amber: #ffb000;
  --amber-dim: #aa7700;
  --cyan: #00e5ff;
  --cyan-dim: #009aaa;
  --red: #ff4444;
  --white: #eee;
  --font-mono: 'IBM Plex Mono', 'Fira Code', 'Cascadia Code', 'Source Code Pro', 'Menlo', 'Monaco', 'Consolas', monospace;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

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

/* === Layout === */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

/* === Site Header === */
.site-header {
  text-align: center;
  padding: 24px 16px 8px;
}

.ascii-art {
  color: var(--green);
  font-size: 9px;
  line-height: 1.15;
  overflow-x: auto;
  margin-bottom: 8px;
}

@media (min-width: 640px) {
  .ascii-art { font-size: 12px; }
}

.tagline {
  color: var(--text-muted);
  font-size: 12px;
}

/* === Terminal Box === */
.terminal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 16px;
  overflow: hidden;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}

.section-header h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-body {
  padding: 12px 16px;
}

/* === Experiment Cards === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  margin: 10px 0;
}

.card {
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 14px;
  text-decoration: none;
  transition: all 0.2s;
}
.card:hover {
  border-color: var(--green-dim);
  background: rgba(0, 255, 65, 0.03);
  text-decoration: none;
}

.card h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 4px;
}
.card p {
  font-size: 11px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.4;
}

.card-small { padding: 8px 12px; }
.card-small h3 { font-size: 12px; }

/* === Section themes === */
.section-depth { border-color: var(--cyan-dim); }
.section-depth .section-header { border-bottom-color: var(--cyan-dim); }
.section-depth .section-header h2 { color: var(--cyan); }

.section-hub { border-color: var(--amber-dim); }
.section-hub .section-header { border-bottom-color: var(--amber-dim); }
.section-hub .section-header h2 { color: var(--amber); }

.section-size { border-color: rgba(204, 153, 255, 0.4); }
.section-size .section-header { border-bottom-color: rgba(204, 153, 255, 0.4); }
.section-size .section-header h2 { color: #cc99ff; }

/* === Canary block === */
.canary-block {
  background: #050505;
  border: 1px solid var(--border);
  border-left: 3px solid var(--green);
  padding: 10px 14px;
  margin: 14px 0;
  font-size: 13px;
  color: var(--green);
}

/* === Info table === */
.info-table {
  width: 100%;
  border-collapse: collapse;
}

.info-table td {
  padding: 4px 8px;
  vertical-align: top;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.info-table .label {
  color: var(--amber);
  white-space: nowrap;
  width: 180px;
  font-weight: 500;
}

.info-table .value {
  color: var(--text);
  word-break: break-all;
}

/* === Navigation === */
.back-link {
  display: inline-block;
  color: var(--text-muted);
  font-size: 12px;
  margin-bottom: 8px;
  text-decoration: none;
}
.back-link:hover { color: var(--cyan); }
.back-link::before { content: '< '; color: var(--green-dim); }

.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  gap: 12px;
}

.nav-btn {
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  transition: all 0.2s;
}
.nav-btn:hover {
  border-color: var(--green-dim);
  color: var(--green);
  text-decoration: none;
}

.nav-next { color: var(--cyan); }
.nav-next:hover { color: var(--green); }

.series-end {
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
}

/* === Article content === */
.article-body {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 12px;
}

.article-body p {
  margin-bottom: 10px;
}

.canary-note {
  font-size: 12px;
  color: var(--text-muted);
}

/* === Level / topic indicator === */
.level-indicator {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.level-depth {
  background: rgba(0, 229, 255, 0.12);
  color: var(--cyan);
  border: 1px solid var(--cyan-dim);
}

.level-hub {
  background: rgba(255, 176, 0, 0.12);
  color: var(--amber);
  border: 1px solid var(--amber-dim);
}

/* === Size page === */
.archive-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.meta-item {
  font-size: 12px;
  color: var(--text-muted);
}

.meta-item strong {
  color: var(--amber);
}

.archive-content {
  white-space: pre-wrap;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
  background: #050505;
  padding: 12px;
  border-radius: 3px;
  overflow-x: auto;
  max-height: none;
}

/* === Muted text === */
.muted {
  color: var(--text-muted);
  font-style: italic;
}

/* === Footer === */
.site-footer {
  text-align: center;
  padding: 24px 16px;
  border-top: 1px solid var(--border);
  margin-top: 24px;
}

.site-footer p {
  color: var(--text-muted);
  font-size: 11px;
  margin-bottom: 4px;
}

.site-footer a {
  color: var(--text-muted);
  font-size: 11px;
}
.site-footer a:hover {
  color: var(--cyan);
}

/* === Responsive === */
@media (max-width: 640px) {
  body { font-size: 12px; }
  .container { padding: 0 8px 24px; }
  .section-body { padding: 8px 10px; }
  .card-grid { grid-template-columns: 1fr; }
  .chapter-nav { flex-direction: column; }
  .ascii-art { font-size: 7px; }
}