:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #161b22;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-green: #3fb950;
  --accent-purple: #764ba2;
  --accent-orange: #d29922;
  --border: #30363d;
  --border-light: #21262d;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  padding: 24px 16px;
  font-size: 14px;
}

/* Header */
header {
  text-align: center;
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

header h1 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Navigation */
.nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--accent);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.nav a:hover {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

/* Stats Section */
.stats-section {
  margin-bottom: 32px;
}

.stats-section h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border);
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent-green);
  line-height: 1.2;
}

.stat-label {
  color: var(--text-secondary);
  margin-top: 6px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Sections */
section {
  margin-bottom: 32px;
  background: var(--bg-card);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

section h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

/* Domain Grid */
.domain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.domain-card {
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s;
}

.domain-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.domain-card h3 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.domain-card p {
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

/* Project Table */
.project-table {
  width: 100%;
  border-collapse: collapse;
}

.project-table thead tr {
  border-bottom: 2px solid var(--border);
}

.project-table th {
  text-align: left;
  padding: 12px 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.project-table td {
  padding: 12px 8px;
  border-bottom: 1px solid var(--border-light);
}

.project-table tbody tr:hover {
  background: var(--bg-secondary);
}

.project-table a {
  color: var(--accent);
  text-decoration: none;
}

.project-table a:hover {
  text-decoration: underline;
}

/* Paper Table */
.paper-table {
  width: 100%;
  border-collapse: collapse;
}

.paper-table thead tr {
  border-bottom: 2px solid var(--border);
}

.paper-table th {
  text-align: left;
  padding: 12px 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.paper-table td {
  padding: 12px 8px;
  border-bottom: 1px solid var(--border-light);
}

.paper-table tbody tr:hover {
  background: var(--bg-secondary);
}

.paper-table a {
  color: var(--accent);
  text-decoration: none;
}

.paper-table a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.8125rem;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

/* Responsive */
@media (max-width: 768px) {
  body {
    padding: 16px 12px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav {
    flex-direction: column;
    align-items: center;
  }

  .project-table,
  .paper-table {
    font-size: 0.8125rem;
  }

  .project-table th,
  .project-table td,
  .paper-table th,
  .paper-table td {
    padding: 8px 4px;
  }
}