:root {
  --bg-color: #ffffff;
  --text-color: #1a1a1a;
  --link-color: #0066cc;
  --accent-color: #f4f4f4;
  --border-color: #eaeaea;
  --header-bg: #ffffff;
  --code-bg: #f8f8f8;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --link-color: #4da3ff;
  --accent-color: #1e1e1e;
  --border-color: #333333;
  --header-bg: #121212;
  --code-bg: #1e1e1e;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  margin: 0;
  padding: 0;
  transition: background-color 0.3s, color 0.3s;
}

.wrapper {
  display: grid;
  grid-template-columns: 250px 1fr 250px;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.left-sidebar {
  padding-top: 2rem;
  border-right: 1px solid var(--border-color);
  height: calc(100vh - 80px);
  position: sticky;
  top: 80px;
  overflow-y: auto;
}

.right-sidebar {
  padding-top: 2rem;
  border-left: 1px solid var(--border-color);
  height: calc(100vh - 80px);
  position: sticky;
  top: 80px;
  overflow-y: auto;
}

main {
  padding: 2rem 0;
}

.sidebar-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav li {
  margin-bottom: 0.5rem;
}

.sidebar-nav .volume-title {
  font-weight: bold;
  font-size: 0.9rem;
  text-transform: uppercase;
  color: #888;
  margin-top: 1.5rem;
  display: block;
}

@media (max-width: 1100px) {
  .wrapper {
    grid-template-columns: 200px 1fr;
  }
  .right-sidebar {
    display: none;
  }
}

@media (max-width: 800px) {
  .wrapper {
    grid-template-columns: 1fr;
  }
  .left-sidebar, .right-sidebar {
    position: static;
    height: auto;
    border: none;
    padding: 0;
  }
}

h1, h2, h3, h4 {
  line-height: 1.2;
  margin-top: 2rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  background-color: var(--code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

pre {
  background-color: var(--code-bg);
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
}

blockquote {
  border-left: 4px solid var(--border-color);
  margin: 0;
  padding-left: 1.5rem;
  font-style: italic;
  color: #888;
}

footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: #888;
}