/* Aligned with main site: dark, minimal, Syne + IBM Plex Sans */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --bg-color: #0a0a0a;
  --text-color: #e4e4e7;
  --text-muted: #71717a;
  --card-border: rgba(255, 255, 255, 0.12);
  --link-color: #fafafa;
  --link-hover: #a1a1aa;
  --font-display: 'Syne', sans-serif;
  --font-main: 'IBM Plex Sans', sans-serif;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.65;
  font-size: 16px;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s ease;
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--link-hover);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

/* Minimal header: no gradient, no big block */
.dd-header {
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--card-border);
}

.dd-header h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #fff;
  margin: 0 0 6px 0;
}

.dd-header .dd-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0 0 20px 0;
}

.dd-header .back-link {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
  border: none;
}

.dd-header .back-link:hover {
  color: var(--link-color);
}

/* Sections: border-bottom only, no cards/shadows */
section {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--card-border);
}

section:last-of-type {
  border-bottom: none;
}

h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #fff;
  margin: 0 0 16px 0;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-color);
  margin: 28px 0 10px 0;
}

p {
  margin: 0 0 14px 0;
}

ul {
  margin: 0 0 14px 0;
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

.sub-text {
  color: var(--text-muted);
  font-size: 0.95em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

table th,
table td {
  border: 1px solid var(--card-border);
  padding: 10px 14px;
  text-align: left;
}

table th {
  background: rgba(255, 255, 255, 0.04);
  font-weight: 600;
  color: var(--text-color);
}

table tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  font-size: 0.9em;
  border: 1px solid var(--card-border);
}

/* Braitenberg simulation: dark, minimal */
#simulation-container {
  margin-top: 20px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
}

#simulation-container .instruction {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
}

.controls {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.controls button {
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--card-border);
  padding: 8px 14px;
  font-size: 0.9rem;
  font-family: var(--font-main);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.controls button:hover {
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
}

.controls button.active {
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

#behavior-desc {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
}

canvas {
  background: #000;
  display: block;
  max-width: 100%;
}