/* ============================================================
   TravelNet Docs — docs.css
   Three-column layout: sidebar | content | TOC
   Inherits CSS variables from main.css
   ============================================================ */

/* --- Docs layout ------------------------------------------ */
.docs-wrapper {
  display: grid;
  grid-template-columns: 260px 1fr 220px;
  grid-template-areas: "sidebar content toc";
  gap: 0;
  min-height: calc(100vh - 52px);
  max-width: 1440px;
  margin: 0 auto;
}

/* --- Sidebar ---------------------------------------------- */
.docs-sidebar {
  grid-area: sidebar;
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
  overflow-y: auto;
  border-right: 1px solid var(--border);
  padding: var(--space-6) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.docs-sidebar::-webkit-scrollbar { width: 4px; }
.docs-sidebar::-webkit-scrollbar-track { background: transparent; }
.docs-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-section {
  margin-bottom: var(--space-2);
}

.sidebar-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-5);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  cursor: pointer;
  user-select: none;
  transition: color var(--duration-fast);
}

.sidebar-section-title:hover { color: var(--text-secondary); }

.sidebar-section-title a {
  text-decoration: none;
  color: inherit;
  flex: 1;
}

.sidebar-chevron {
  width: 12px;
  height: 12px;
  transition: transform var(--duration-fast);
  opacity: 0.5;
}

.sidebar-section.open .sidebar-chevron {
  transform: rotate(90deg);
}

.sidebar-children {
  display: none;
  flex-direction: column;
}

.sidebar-section.open .sidebar-children {
  display: flex;
}

.sidebar-link {
  display: block;
  padding: 6px var(--space-5) 6px calc(var(--space-5) + 12px);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: var(--space-4);
  transition: color var(--duration-fast), border-color var(--duration-fast),
              background var(--duration-fast);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.sidebar-link:hover {
  color: var(--text-primary);
  background: var(--accent-subtle);
}

.sidebar-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-subtle);
  font-weight: 500;
}

.sidebar-search {
  padding: 0 var(--space-4) var(--space-4);
}

.sidebar-search-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--duration-fast);
}

.sidebar-search-input::placeholder { color: var(--text-tertiary); }
.sidebar-search-input:focus { border-color: var(--accent); }

.search-results {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 4px);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 400px;
  overflow-y: auto;
  z-index: 50;
  display: none;
}

.search-results.visible { display: block; }

.search-result-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: background var(--duration-fast);
}

.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--accent-subtle); }

.search-result-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.search-result-excerpt {
  font-size: 12px;
  color: var(--text-tertiary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-result-section {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 2px;
}

.search-no-results {
  padding: var(--space-4);
  text-align: center;
  font-size: 13px;
  color: var(--text-tertiary);
}

/* --- Main content ----------------------------------------- */
.docs-content {
  grid-area: content;
  padding: var(--space-8) var(--space-8);
  min-width: 0; /* prevent overflow */
  max-width: 780px;
}

/* Breadcrumb */
.docs-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  font-size: 12px;
  color: var(--text-tertiary);
}

.docs-breadcrumb a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--duration-fast);
}

.docs-breadcrumb a:hover { color: var(--accent); }
.docs-breadcrumb-sep { opacity: 0.4; }

/* Page header */
.docs-page-header {
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border);
}

.docs-page-section {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.docs-page-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.docs-page-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Prose */
.docs-prose h2 {
  font-size: 22px;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: var(--space-8) 0 var(--space-4);
  padding-top: var(--space-2);
  scroll-margin-top: calc(52px + var(--space-4));
}

.docs-prose h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--space-6) 0 var(--space-3);
  scroll-margin-top: calc(52px + var(--space-4));
}

.docs-prose h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: var(--space-5) 0 var(--space-2);
}

.docs-prose p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.docs-prose strong { color: var(--text-primary); font-weight: 600; }
.docs-prose em { font-style: italic; }

.docs-prose a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 132, 255, 0.3);
  transition: border-color var(--duration-fast);
}

.docs-prose a:hover { border-bottom-color: var(--accent); }

.docs-prose ul,
.docs-prose ol {
  padding-left: var(--space-5);
  margin-bottom: var(--space-4);
}

.docs-prose li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.docs-prose li strong { color: var(--text-primary); }

/* Inline code */
.docs-prose code {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 6px;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--accent);
}

/* Code blocks */
.docs-prose pre {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  overflow-x: auto;
  margin: var(--space-5) 0;
  position: relative;
}

.docs-prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  color: var(--text-primary);
  border-radius: 0;
}

/* Code block language label */
.docs-prose pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Callout boxes */
.callout {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  margin: var(--space-5) 0;
  font-size: 14px;
  line-height: 1.6;
}

.callout-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }

.callout p { font-size: 14px; margin: 0; color: inherit; }
.callout strong { color: inherit; }

.callout-note {
  background: rgba(10, 132, 255, 0.08);
  border: 1px solid rgba(10, 132, 255, 0.2);
  color: var(--text-secondary);
}

.callout-tip {
  background: rgba(48, 209, 88, 0.08);
  border: 1px solid rgba(48, 209, 88, 0.2);
  color: var(--text-secondary);
}

.callout-warning {
  background: rgba(255, 159, 10, 0.08);
  border: 1px solid rgba(255, 159, 10, 0.2);
  color: var(--text-secondary);
}

.callout-decision {
  background: rgba(191, 90, 242, 0.08);
  border: 1px solid rgba(191, 90, 242, 0.2);
  color: var(--text-secondary);
}

/* Tables */
.docs-prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: var(--space-5) 0;
}

.docs-prose th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  border-bottom: 1px solid var(--border-strong);
}

.docs-prose td {
  padding: var(--space-3) var(--space-4);
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.docs-prose tr:last-child td { border-bottom: none; }
.docs-prose tr:hover td { background: var(--bg-sunken); }

/* Horizontal rule */
.docs-prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-8) 0;
}

/* --- Prev / Next navigation ------------------------------- */
.docs-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-9);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

.prev-next-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--duration-fast);
}

.prev-next-link:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.prev-next-link.next { text-align: right; }

.prev-next-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.prev-next-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.prev-next-section {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* --- TOC (right sidebar) ---------------------------------- */
.docs-toc {
  grid-area: toc;
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
  overflow-y: auto;
  padding: var(--space-8) var(--space-5) var(--space-8) var(--space-4);
  border-left: 1px solid var(--border);
  scrollbar-width: none;
}

.docs-toc::-webkit-scrollbar { display: none; }

.toc-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-item a {
  display: block;
  font-size: 12px;
  color: var(--text-tertiary);
  text-decoration: none;
  padding: 3px var(--space-2);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: color var(--duration-fast), border-color var(--duration-fast);
  line-height: 1.4;
}

.toc-item a:hover { color: var(--text-secondary); }

.toc-item.active a {
  color: var(--accent);
  border-left-color: var(--accent);
}

.toc-item.h3 a {
  padding-left: calc(var(--space-2) + 12px);
  font-size: 11px;
}

/* --- Responsive ------------------------------------------- */
@media (max-width: 1100px) {
  .docs-wrapper {
    grid-template-columns: 240px 1fr;
    grid-template-areas: "sidebar content";
  }
  .docs-toc { display: none; }
  .docs-content { max-width: 100%; }
}

@media (max-width: 768px) {
  .docs-wrapper {
    grid-template-columns: 1fr;
    grid-template-areas: "content";
  }
  .docs-sidebar { display: none; }
  .docs-content { padding: var(--space-6) var(--space-4); }
}