:root {
  --bg-primary: #0f1117;
  --bg-secondary: #161922;
  --bg-tertiary: #1e2230;
  --bg-hover: #252a3a;
  --border-color: #262b3d;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.14);
  --code-bg: #141720;
  --callout-info-bg: rgba(56, 189, 248, 0.1);
  --callout-info-border: #0284c7;
  --callout-warn-bg: rgba(245, 158, 11, 0.12);
  --callout-warn-border: #d97706;
  --callout-tip-bg: rgba(16, 185, 129, 0.12);
  --callout-tip-border: #059669;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

html[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #e2e8f0;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #0284c7;
  --accent-soft: rgba(2, 132, 199, 0.1);
  --code-bg: #f8fafc;
  --callout-info-bg: #f0f9ff;
  --callout-info-border: #0284c7;
  --callout-warn-bg: #fffbeb;
  --callout-warn-border: #d97706;
  --callout-tip-bg: #ecfdf5;
  --callout-tip-border: #059669;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.mobile-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  height: 52px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
}

.mobile-brand {
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
}

.sidebar {
  width: 295px;
  min-width: 295px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100vh;
  user-select: none;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 10px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-logo {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-weight: 700;
  font-size: 14px;
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  border-radius: 6px;
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-search {
  padding: 6px 12px 10px;
}

.search-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s;
}

.search-trigger:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.search-trigger span {
  flex: 1;
  text-align: left;
}

.search-trigger kbd {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  background: var(--bg-secondary);
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.sidebar-quick-nav {
  padding: 0 8px 10px;
  border-bottom: 1px solid var(--border-color);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.nav-badge {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 1px 6px;
  border-radius: 10px;
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.text-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
}

.text-btn:hover {
  color: var(--text-primary);
}

.collections-tree {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 16px;
}

.col-group {
  margin-bottom: 2px;
}

.col-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
}

.col-header:hover {
  background: var(--bg-hover);
}

.col-header.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.col-dot {
  width: 9px;
  height: 9px;
  border-radius: 3px;
  flex-shrink: 0;
}

.col-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.col-count {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
}

.tree-chevron {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.tree-chevron.expanded {
  transform: rotate(90deg);
}

.tree-children {
  padding-left: 14px;
  border-left: 1px solid var(--border-color);
  margin-left: 12px;
}

.tree-children.collapsed {
  display: none;
}

.tree-doc-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 12.5px;
  color: var(--text-secondary);
  text-decoration: none;
}

.tree-doc-row:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tree-doc-row.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.tree-doc-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.draft-pill {
  font-size: 9px;
  padding: 1px 4px;
  border-radius: 3px;
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  text-transform: uppercase;
}

.sidebar-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border-color);
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
}

/* Main Area */
.main-area {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
}

.content-wrapper {
  display: flex;
  max-width: 1180px;
  margin: 0 auto;
  padding: 36px 44px 80px;
  gap: 40px;
}

.doc-container {
  flex: 1;
  min-width: 0;
  max-width: 820px;
}

.toc-sidebar {
  width: 220px;
  flex-shrink: 0;
  position: sticky;
  top: 32px;
  align-self: flex-start;
  max-height: calc(100vh - 64px);
  overflow-y: auto;
}

.toc-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.toc-link {
  display: block;
  font-size: 12.5px;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 4px 0;
  line-height: 1.35;
  border-left: 2px solid var(--border-color);
  padding-left: 10px;
}

.toc-link:hover {
  color: var(--accent);
  border-left-color: var(--accent);
}

.toc-link.depth-3 {
  padding-left: 20px;
  font-size: 12px;
}

/* Breadcrumbs & Doc Header */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumbs a:hover {
  color: var(--accent);
}

.doc-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 18px;
  margin-bottom: 26px;
}

.doc-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.doc-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12.5px;
  color: var(--text-muted);
}

.doc-badges {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.col-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 500;
  text-decoration: none;
}

.status-badge {
  padding: 2px 8px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.status-badge.draft {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
}

.status-badge.archived {
  background: rgba(239, 68, 68, 0.18);
  color: #f87171;
}

.doc-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
}

.action-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.action-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0f172a;
  font-weight: 600;
}

/* Markdown Body */
.markdown-body {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--text-primary);
  overflow-wrap: break-word;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin-top: 1.7em;
  margin-bottom: 0.6em;
  font-weight: 700;
  line-height: 1.3;
  scroll-margin-top: 24px;
}

.markdown-body h1 { font-size: 1.75rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.4rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.25em; }
.markdown-body h3 { font-size: 1.18rem; }
.markdown-body h4 { font-size: 1.02rem; }

.markdown-body a {
  color: var(--accent);
  text-decoration: none;
}

.markdown-body a:hover {
  text-decoration: underline;
}

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin: 12px 0;
  cursor: zoom-in;
}

.markdown-body pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13.5px;
  line-height: 1.55;
  position: relative;
}

.markdown-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
}

.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border-color);
  padding: 9px 13px;
  text-align: left;
}

.markdown-body th {
  background: var(--bg-secondary);
  font-weight: 600;
}

.markdown-body blockquote {
  margin: 16px 0;
  padding: 8px 16px;
  border-left: 4px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
}

/* Callouts */
.outline-callout {
  padding: 14px 18px;
  border-radius: 8px;
  border-left: 4px solid var(--callout-info-border);
  background: var(--callout-info-bg);
  margin: 16px 0;
}

.outline-callout.warning {
  border-left-color: var(--callout-warn-border);
  background: var(--callout-warn-bg);
}

.outline-callout.tip,
.outline-callout.success {
  border-left-color: var(--callout-tip-border);
  background: var(--callout-tip-bg);
}

/* Attachment Card */
.attachment-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  margin: 12px 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  text-decoration: none !important;
  color: var(--text-primary) !important;
  transition: border-color 0.15s;
}

.attachment-card:hover {
  border-color: var(--accent);
}

.attachment-info {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.attachment-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 11px;
  flex-shrink: 0;
}

.attachment-name {
  font-weight: 600;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-size {
  font-size: 12px;
  color: var(--text-muted);
}

/* Sub-docs & Backlinks */
.doc-Subsections {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.subsection-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.doc-card {
  display: block;
  padding: 14px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-primary);
  transition: border-color 0.15s, transform 0.15s;
}

.doc-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.doc-card-title {
  font-weight: 600;
  font-size: 14.5px;
  margin-bottom: 4px;
}

.doc-card-meta {
  font-size: 12px;
  color: var(--text-muted);
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 8vh;
  z-index: 100;
}

.modal-backdrop.hidden {
  display: none;
}

.search-dialog {
  width: 92%;
  max-width: 680px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.search-input-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.search-input-bar input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 16px;
  font-family: inherit;
}

.esc-badge {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: 5px;
  padding: 3px 7px;
  font-size: 11px;
  cursor: pointer;
}

.search-results {
  max-height: 65vh;
  overflow-y: auto;
  padding: 8px;
}

.search-result-item {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-primary);
}

.search-result-item:hover {
  background: var(--bg-hover);
}

.search-result-top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 3px;
}

.search-result-title {
  font-weight: 600;
  font-size: 14.5px;
}

.search-result-col {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.search-result-snippet {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.search-result-snippet mark {
  background: rgba(56, 189, 248, 0.25);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 2px;
}

.raw-dialog {
  width: 92%;
  max-width: 780px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.raw-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.raw-dialog-header h3 {
  margin: 0;
  font-size: 16px;
}

.raw-dialog-actions {
  display: flex;
  gap: 8px;
}

#raw-markdown-textarea {
  width: 100%;
  height: 60vh;
  background: var(--code-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  resize: none;
}

#lightbox-img {
  max-width: 92vw;
  max-height: 86vh;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

@media (max-width: 1024px) {
  .toc-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .mobile-header {
    display: flex;
  }
  .sidebar {
    position: fixed;
    top: 52px;
    left: 0;
    bottom: 0;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .content-wrapper {
    padding: 72px 20px 60px;
  }
}