:root {
  --bg-color: #f8f9fa;
  --text-color: #212529;
  --primary-color: #3182ce;
  --primary-hover: #2b6cb0;
  --border-color: #e2e8f0;
  --sidebar-bg: #edf2f7;
  --sidebar-active: #e2e8f0;
  --content-bg: #ffffff;
  --badge-bg: #ebf8ff;
  --badge-color: #2b6cb0;
  --badge-border: #bee3f8;
  --toc-active: #3182ce;
  --code-bg: #edf2f7;
  --code-text: #805ad5;
  --header-height: 60px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f172a;
    --text-color: #cbd5e1;
    --primary-color: #38bdf8;
    --primary-hover: #0ea5e9;
    --border-color: #1e293b;
    --sidebar-bg: #1e293b;
    --sidebar-active: #334155;
    --content-bg: #0f172a;
    --badge-bg: #0369a133;
    --badge-color: #38bdf8;
    --badge-border: #0369a1;
    --toc-active: #38bdf8;
    --code-bg: #1e293b;
    --code-text: #c084fc;
  }
}

* {
  box-sizing: border-box;
}

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

a {
  color: var(--primary-color);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

header {
  height: var(--header-height);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background-color: var(--content-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
}

.container {
  display: flex;
  min-height: calc(100vh - var(--header-height));
  max-width: 1600px;
  margin: 0 auto;
}

/* Sidebars layout */
.sidebar-left {
  width: 280px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  padding: 20px;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar-right {
  width: 280px;
  border-left: 1px solid var(--border-color);
  padding: 20px;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
  flex-shrink: 0;
}

main {
  flex-grow: 1;
  padding: 40px;
  background-color: var(--content-bg);
  overflow-x: hidden;
}

/* File explorer */
.search-box {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--content-bg);
  color: var(--text-color);
  margin-bottom: 15px;
}

.tree-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.tree-item {
  margin: 4px 0;
}

.tree-folder {
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  user-select: none;
  padding: 4px;
  border-radius: 4px;
}
.tree-folder:hover {
  background-color: var(--sidebar-active);
}

.tree-folder-contents {
  list-style: none;
  padding-left: 15px;
  margin: 0;
}

.tree-folder-contents.is-collapsed {
  display: none;
}

.tree-folder-contents.is-expanded {
  display: block;
}

.is-hidden {
  display: none !important;
}

.tree-file-link {
  display: block;
  padding: 4px 8px;
  color: var(--text-color);
  border-radius: 4px;
}
.tree-file-link:hover, .tree-file-link.active {
  background-color: var(--sidebar-active);
  text-decoration: none;
}
.tree-file-link.active {
  font-weight: 600;
  color: var(--primary-color);
}

/* TOC style */
.toc-title {
  font-weight: 700;
  margin-top: 0;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
}

.toc-link {
  display: block;
  font-size: 0.9rem;
  color: var(--text-color);
  opacity: 0.8;
  margin: 8px 0;
  border-left: 2px solid transparent;
  padding-left: 8px;
}

.toc-link[data-level="1"] { padding-left: 0px; }
.toc-link[data-level="2"] { padding-left: 12px; }
.toc-link[data-level="3"] { padding-left: 24px; }
.toc-link[data-level="4"] { padding-left: 36px; }
.toc-link[data-level="5"] { padding-left: 48px; }
.toc-link[data-level="6"] { padding-left: 60px; }

.toc-link:hover, .toc-link.active {
  opacity: 1;
  text-decoration: none;
}
.toc-link.active {
  color: var(--toc-active);
  border-left-color: var(--toc-active);
  font-weight: 600;
}

.badge {
  display: inline-block;
  margin-right: 8px;
  margin-bottom: 8px;
}

/* Responsive design */
@media (max-width: 1024px) {
  .sidebar-right {
    display: none;
  }
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }
  .sidebar-left {
    width: 100%;
    position: static;
    height: auto;
    max-height: 300px;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  main {
    padding: 20px;
  }
}

/* Backlinks Component */
.backlinks-section {
  margin-top: 50px;
  padding: 20px;
  border-top: 1px solid var(--border-color);
  background-color: var(--badge-bg);
  border-radius: 8px;
}

.backlinks-title {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 1rem;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.backlinks-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.backlink-item-wrap {
  margin: 6px 0;
}

.backlink-item {
  font-weight: 500;
  color: var(--text-color);
}

.backlink-item:hover {
  color: var(--primary-color);
  text-decoration: underline;
}