/* =========================================================
   BookDown "gitbook" style documentation layout
   Replicates the look of bookdown::gitbook output
   ========================================================= */

:root {
  --gb-sidebar-w: 300px;
  --gb-sidebar-bg: #fafafa;
  --gb-sidebar-border: #e7e7e7;
  --gb-link: #4183c4;
  --gb-text: #333333;
  --gb-muted: #999999;
  --gb-summary-active: #008cff;
}

/* The book takes over the full viewport below the site header */
body.docs-page {
  background: #fff;
}

.docs-shell {
  display: block;
  position: relative;
  min-height: calc(100vh - var(--header-h));
}

/* ---------- Sidebar (book summary) ---------- */
.docs-sidebar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  width: var(--gb-sidebar-w);
  background: var(--gb-sidebar-bg);
  border-right: 1px solid var(--gb-sidebar-border);
  overflow-y: auto;
  padding: 0;
  font-size: 15px;
  z-index: 30;
}

/* Search box at top of summary */
.docs-search {
  position: relative;
  padding: 14px 16px;
  border-bottom: 1px solid var(--gb-sidebar-border);
  margin: 0;
}

.docs-search input {
  width: 100%;
  padding: 7px 10px 7px 32px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 13px;
  font-family: var(--font-sans);
  background: #fff;
  color: var(--gb-text);
}

.docs-search input:focus {
  outline: none;
  border-color: var(--gb-link);
  box-shadow: 0 0 0 2px rgba(65, 131, 196, 0.18);
}

.docs-search svg {
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gb-muted);
  pointer-events: none;
}

/* Book title block */
.docs-title-block {
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--gb-sidebar-border);
  margin: 0;
}

.docs-title-block .doc-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--gb-text);
  line-height: 1.3;
}

.docs-title-block .doc-meta {
  font-size: 12px;
  color: var(--gb-muted);
  margin-top: 2px;
}

/* Chapter list (summary) */
.docs-nav {
  list-style: none;
  margin: 0;
  padding: 10px 0 40px;
}

.docs-nav .nav-part {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 11px;
  font-weight: 700;
  color: var(--gb-muted);
  margin: 16px 0 4px;
  padding: 0 18px;
}

.docs-nav li {
  margin: 0;
}

.docs-nav a {
  display: block;
  padding: 7px 18px;
  color: #364149;
  font-size: 14px;
  line-height: 1.45;
  border-left: 3px solid transparent;
}

.docs-nav a:hover {
  color: var(--gb-link);
  text-decoration: none;
  background: #f0f0f0;
}

.docs-nav a.active {
  color: var(--gb-summary-active);
  font-weight: 600;
  border-left-color: var(--gb-summary-active);
  background: #fff;
}

.docs-nav .sub {
  padding-left: 16px;
}

.docs-nav .num {
  color: var(--gb-muted);
  font-variant-numeric: tabular-nums;
  margin-right: 8px;
}

.docs-nav a.active .num {
  color: var(--gb-summary-active);
}

.docs-nav li.hidden {
  display: none;
}

.no-results {
  display: none;
  color: var(--gb-muted);
  font-size: 13px;
  padding: 12px 18px;
}

.no-results.show {
  display: block;
}

/* ---------- Main reading column ---------- */
.docs-main {
  margin-left: var(--gb-sidebar-w);
  padding: 0;
  background: #fff;
  min-height: calc(100vh - var(--header-h));
}

/* Inner centered page like gitbook .page-inner */
.docs-breadcrumb,
.docs-header,
.docs-actions,
.docs-content,
.docs-pager {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.docs-breadcrumb {
  font-size: 13px;
  color: var(--gb-muted);
  padding-top: 40px;
  margin-bottom: 18px;
}

.docs-breadcrumb a {
  color: var(--gb-link);
}

.docs-header {
  margin-bottom: 6px;
}

.docs-header h1 {
  font-size: 2.1rem;
  font-weight: 700;
  margin: 0 0 10px;
  line-height: 1.25;
}

.docs-header .author {
  color: var(--gb-text);
  font-size: 15px;
}

.docs-header .date {
  color: var(--gb-muted);
  font-size: 14px;
}

.docs-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px auto 8px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}

.docs-content {
  font-size: 16px;
  line-height: 1.7;
  color: var(--gb-text);
  padding-bottom: 40px;
}

.docs-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-top: 6px;
  scroll-margin-top: 84px;
}

.docs-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 32px 0 12px;
  scroll-margin-top: 84px;
}

.docs-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 24px 0 10px;
}

.docs-content h2 .sec-num,
.docs-content h3 .sec-num {
  color: var(--gb-muted);
  font-weight: 600;
  margin-right: 10px;
  font-variant-numeric: tabular-nums;
}

.docs-content p {
  margin: 0 0 16px;
}

.docs-content a {
  color: var(--gb-link);
}

.docs-content ul,
.docs-content ol {
  padding-left: 26px;
  margin: 0 0 16px;
}

.docs-content li {
  margin: 6px 0;
}

.docs-content figure {
  margin: 28px 0;
}

.docs-content figcaption {
  text-align: center;
  font-size: 13.5px;
  color: var(--gb-muted);
  margin-top: 8px;
}

/* Inline code + code blocks (gitbook style) */
.docs-content code {
  background: #f7f7f7;
  color: #c7254e;
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 0.88em;
}

.docs-content pre {
  background: #f7f7f7;
  border: 1px solid #e1e1e8;
  border-radius: 4px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 18px 0;
  line-height: 1.5;
}

.docs-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 0.85em;
}

/* Blockquote / callout */
.docs-content blockquote,
.docs-content .callout {
  border-left: 4px solid #dfe2e5;
  background: #f8f9fa;
  padding: 12px 16px;
  margin: 18px 0;
  color: #50575e;
}

.docs-content .callout-key {
  border-left-color: var(--gb-link);
  background: #f1f7fd;
  color: var(--gb-text);
}

/* Tables (gitbook bordered) */
.docs-content table,
.docs-content .doc-table,
.docs-content .docs-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.95rem;
}

.docs-content th {
  background: #f5f5f5;
  text-align: left;
  font-weight: 600;
  border: 1px solid #ddd;
  padding: 8px 12px;
}

.docs-content td {
  border: 1px solid #ddd;
  padding: 8px 12px;
}

/* Math block spacing */
.docs-content .katex-display {
  margin: 22px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ---------- Prev / next pager (gitbook navigation) ---------- */
.docs-pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 56px auto 0;
  padding-top: 26px;
  padding-bottom: 40px;
  border-top: 1px solid var(--border);
}

.docs-pager a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  max-width: 48%;
}

.docs-pager a:hover {
  border-color: var(--gb-link);
  text-decoration: none;
}

.docs-pager .pager-label {
  font-size: 12px;
  color: var(--gb-muted);
}

.docs-pager .pager-title {
  font-weight: 600;
  color: var(--gb-text);
}

.docs-pager .next {
  margin-left: auto;
  text-align: right;
}

/* ---------- Mobile ---------- */
.docs-sidebar-toggle {
  display: none;
}

@media (max-width: 960px) {
  .docs-sidebar {
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-lg);
  }

  .docs-sidebar.open {
    transform: translateX(0);
  }

  .docs-main {
    margin-left: 0;
  }

  .docs-breadcrumb {
    padding-top: 20px;
  }

  .docs-sidebar-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 16px auto 0;
    max-width: 800px;
    padding: 8px 14px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: #fff;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
  }
}