:root {
  --primary-color: #4a90d9;
  --sidebar-bg: #2c3e50;
  --sidebar-text: #ecf0f1;
  --sidebar-active: #3498db;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

.sidebar {
  background: var(--sidebar-bg);
}

.sidebar-nav {
  color: var(--sidebar-text);
}

.sidebar-nav li.active > a {
  color: var(--sidebar-active);
  border-left-color: var(--sidebar-active);
}

.sidebar-nav li > a:hover {
  color: var(--sidebar-active);
}

.markdown-section h1 {
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 10px;
}

.markdown-section h2 {
  color: var(--primary-color);
  border-left: 4px solid var(--primary-color);
  padding-left: 10px;
}

.markdown-section h3 {
  color: #34495e;
}

.markdown-section code {
  background: #f8f9fa;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Fira Code', 'Consolas', monospace;
}

.markdown-section pre {
  background: #1e272e;
  border-radius: 8px;
  overflow: hidden;
}

.markdown-section pre code {
  background: transparent;
  padding: 0;
  color: #dfe6e9;
}

.markdown-section blockquote {
  border-left: 4px solid var(--primary-color);
  background: #f8f9fa;
  padding: 10px 15px;
  margin: 16px 0;
}

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

.markdown-section th,
.markdown-section td {
  border: 1px solid #ddd;
  padding: 8px 12px;
  text-align: left;
}

.markdown-section th {
  background: #f8f9fa;
  font-weight: 600;
}

.markdown-section tr:nth-child(even) {
  background: #f8f9fa;
}

.markdown-section img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.copy-code-button {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.copy-code-button:hover {
  background: #3a7bc8;
}

.pagination-item {
  color: var(--primary-color);
}

.pagination-item:hover {
  text-decoration: underline;
}