/* AI × Networks Knowledge Base - Dark Theme */

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent-blue: #58a6ff;
  --accent-green: #56d364;
  --accent-purple: #b794f4;
  --accent-orange: #e8943a;
  --border: #30363d;
  --code-bg: #161b22;
  --link-color: #58a6ff;
}

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

html, body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  font-size: 16px;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  margin: 1.5rem 0 0.75rem 0;
  line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; color: var(--accent-blue); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

code {
  background-color: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.9em;
  color: var(--accent-green);
}

pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  margin: 1rem 0;
  overflow-x: auto;
}

pre code {
  padding: 0;
  background-color: transparent;
  color: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

nav {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .brand {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--accent-blue);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

nav a:hover {
  color: var(--accent-blue);
}

main {
  padding: 2rem 0;
}

.domains-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 2rem 0;
}

.domain-card {
  background-color: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: all 0.3s;
}

.domain-card:hover {
  border-color: var(--accent-blue);
  background-color: var(--bg-tertiary);
}

.domain-card.networks { border-left: 4px solid #58a6ff; }
.domain-card.ai { border-left: 4px solid #b794f4; }
.domain-card.ai-x-networks { border-left: 4px solid #56d364; }
.domain-card.papers { border-left: 4px solid #e8943a; }

.domain-card h3 {
  margin-top: 0;
  color: var(--text-primary);
}

.domain-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.domain-card a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.domain-card a:hover {
  background-color: var(--border);
}

.graph-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 2rem 0;
  min-height: 400px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th {
  background-color: var(--bg-tertiary);
  border-bottom: 2px solid var(--border);
  padding: 0.75rem;
  text-align: left;
  font-weight: 600;
}

td {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem;
}

tr:hover {
  background-color: var(--bg-tertiary);
}

footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 2rem 0;
  color: var(--text-secondary);
  text-align: center;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
  }

  .domains-grid {
    grid-template-columns: 1fr;
  }
}