/* ULTSQL Documentation Styles — Minimalist Monochrome (Strictly Black & White)
   Inspired by Bklit UI & shadcn/ui */

.docs-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 6.75rem 1.5rem 6rem;
  position: relative;
  z-index: 1;
}

.docs-grid {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 220px;
  gap: 2.5rem;
  align-items: start;
}

/* Left Sidebar Navigation */
.docs-sidebar {
  position: sticky;
  top: 5.5rem;
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
  padding: 1.25rem 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--border-medium) transparent;
}

.docs-search-box {
  position: relative;
  margin-bottom: 1.25rem;
}

.docs-search-input {
  width: 100%;
  padding: 0.6rem 2.2rem 0.6rem 0.85rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.docs-search-input:focus {
  outline: none;
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.docs-search-kbd {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.15rem 0.35rem;
  font-size: 0.68rem;
  font-family: var(--font-mono);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.docs-nav-group {
  margin-bottom: 1.25rem;
}

.docs-nav-group-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 0.45rem;
  padding: 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.docs-nav-link {
  display: block;
  font-size: 0.84rem;
  padding: 0.38rem 0.6rem;
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: all var(--transition-fast);
  line-height: 1.4;
  margin-bottom: 0.1rem;
}

.docs-nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
  transform: translateX(2px);
}

.docs-nav-link.active {
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  border-left: 2px solid var(--text-primary);
  font-weight: 600;
}

/* Center Content Area */
.docs-content {
  min-width: 0;
}

.docs-header-hero {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.docs-badge-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
}

.docs-badge {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
}

.docs-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.docs-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Section styling */
.doc-section {
  margin-bottom: 4.5rem;
  scroll-margin-top: 6rem;
}

.doc-section-h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.doc-section-h2 a.anchor-link {
  opacity: 0;
  color: var(--text-tertiary);
  text-decoration: none;
  margin-left: 0.5rem;
  font-size: 1.2rem;
  transition: opacity var(--transition-fast);
}

.doc-section-h2:hover a.anchor-link {
  opacity: 1;
  color: var(--text-primary);
}

.doc-section-h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.8rem 0 0.75rem;
  color: var(--text-primary);
}

.doc-p {
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.7;
  margin-bottom: 1.2rem;
}

.doc-list {
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
  padding-left: 1.4rem;
}

.doc-list li {
  margin-bottom: 0.4rem;
}

/* Callouts (Monochrome Minimalist) */
.doc-callout {
  padding: 1.1rem 1.35rem;
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
  font-size: 0.92rem;
  line-height: 1.6;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--text-primary);
  color: var(--text-secondary);
}

.doc-callout.tip {
  border-left-color: var(--text-primary);
}

.doc-callout.note {
  border-left-color: var(--border-strong);
}

.doc-callout.warning {
  border-left-color: var(--border-medium);
}

.doc-callout-title {
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-primary);
}

/* Code Snippet Cards with Multi-Language Tabs */
.code-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin: 1.5rem 0 2rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.8rem;
  background: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.code-tabs {
  display: flex;
  gap: 0.35rem;
}

.code-tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-tertiary);
  font-size: 0.76rem;
  font-family: var(--font-mono);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.code-tab-btn.active {
  color: var(--text-primary);
  background: var(--bg-surface);
  border-color: var(--border-medium);
  font-weight: 600;
}

.code-copy-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.code-copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-surface-hover);
}

.code-block {
  padding: 1.15rem 1.25rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-base);
  overflow-x: auto;
}

.code-block code {
  font-family: inherit;
}

/* Syntax Highlighting (Strictly Minimal Monochrome Bklit UI) */
.hl-kw { color: var(--text-primary); font-weight: 700; }
.hl-str { color: var(--text-secondary); }
.hl-num { color: var(--text-tertiary); }
.hl-com { color: var(--text-tertiary); font-style: italic; }
.hl-fn { color: var(--text-primary); }
.hl-type { color: var(--text-secondary); font-weight: 600; }

/* Tables */
.doc-table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.doc-table th {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.doc-table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.doc-table tr:last-child td {
  border-bottom: none;
}

.doc-table code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.15rem 0.35rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
}

/* Right TOC */
.docs-toc {
  position: sticky;
  top: 5.5rem;
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
  padding: 1rem 0.5rem;
}

.docs-toc-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 0.6rem;
}

.docs-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--border-subtle);
}

.docs-toc-item {
  margin: 0;
}

.docs-toc-link {
  display: block;
  font-size: 0.8rem;
  padding: 0.3rem 0 0.3rem 0.85rem;
  color: var(--text-tertiary);
  text-decoration: none;
  line-height: 1.35;
  transition: all var(--transition-fast);
}

.docs-toc-link:hover {
  color: var(--text-primary);
}

.docs-toc-link.active {
  color: var(--text-primary);
  border-left: 2px solid var(--text-primary);
  margin-left: -1px;
  font-weight: 600;
}

/* Mobile drawer & responsive */
@media (max-width: 1080px) {
  .docs-grid {
    grid-template-columns: 240px minmax(0, 1fr);
  }
  .docs-toc {
    display: none;
  }
}

@media (max-width: 820px) {
  .docs-container {
    padding-top: 5rem;
  }
  .docs-grid {
    grid-template-columns: 1fr;
  }
  .docs-sidebar {
    position: static;
    max-height: none;
    margin-bottom: 2rem;
  }
}