/* ===== CSS Variables ===== */
:root {
  --bg: #161618;
  --sidebar-bg: #1a1a1d;
  --text: #c8c9cb;
  --heading: #e8e8ea;
  --link: #7ca9c9;
  --link-hover: #a8c9e4;
  --accent: #5c9a8a;
  --border: #2a2a2d;
  --code-bg: #1e1e22;
  --code-text: #cdd6f4;
  --inline-code-bg: #252529;
  --nav-hover: rgba(124, 169, 201, 0.1);
  --nav-active-bg: rgba(124, 169, 201, 0.16);
  --nav-active-text: #a8c9e4;
  --search-bg: #222226;
  --search-border: #3a3a3d;
  --result-hover: #252529;
  --admonition-note: #3a6ea8;
  --admonition-tip: #3a8a5a;
  --admonition-important: #8a6a3a;
  --admonition-warning: #8a5a3a;
  --admonition-caution: #8a3a3a;
  --table-header: #222226;
  --table-border: #2a2a2d;
  --table-stripe: #1d1d20;
  --toc-active: #7ca9c9;
  --sidebar-width: 270px;
  --toc-width: 230px;
  --content-max: 780px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

[data-theme="light"] {
  --bg: #faf8f8;
  --sidebar-bg: #f0eded;
  --text: #3a3a3a;
  --heading: #1a1a1a;
  --link: #2d6a94;
  --link-hover: #1a4d6e;
  --accent: #2a7a5a;
  --border: #e0dcdc;
  --code-bg: #f5f0f0;
  --code-text: #2a2a2a;
  --inline-code-bg: #ece8e8;
  --nav-hover: rgba(45, 106, 148, 0.08);
  --nav-active-bg: rgba(45, 106, 148, 0.14);
  --nav-active-text: #1a4d6e;
  --search-bg: #ece8e8;
  --search-border: #d4d0d0;
  --result-hover: #e4e0e0;
  --admonition-note: #2a5a9a;
  --admonition-tip: #2a7a4a;
  --admonition-important: #7a5a2a;
  --admonition-warning: #7a4a2a;
  --admonition-caution: #7a2a2a;
  --table-header: #e8e4e4;
  --table-border: #d0cccc;
  --table-stripe: #f2eeee;
  --toc-active: #2d6a94;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.2s, color 0.2s;
}

/* ===== Layout ===== */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

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

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.2rem 0.8rem;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--heading);
  text-decoration: none;
  letter-spacing: -0.01em;
  flex: 1;
  min-width: 0;
}
.site-title:hover { color: var(--link-hover); }

.sidebar-icons { display: flex; gap: 0.3rem; }

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 0.3rem;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
  transition: opacity 0.15s, background 0.15s;
}
.icon-btn:hover { opacity: 1; background: var(--nav-hover); }

.icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: block; }

/* ===== Search ===== */
.search-wrap {
  padding: 0.8rem 1rem;
  position: relative;
  border-bottom: 1px solid var(--border);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--search-bg);
  border: 1px solid var(--search-border);
  border-radius: 6px;
  padding: 0.4rem 0.7rem;
  transition: border-color 0.15s;
}
.search-box:focus-within { border-color: var(--link); }

.search-icon { opacity: 0.5; flex-shrink: 0; }

.search-input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.875rem;
  width: 100%;
  font-family: var(--font);
}
.search-input::placeholder { color: var(--text); opacity: 0.4; }

.search-results {
  position: absolute;
  top: calc(100% - 0.2rem);
  left: 1rem;
  right: 1rem;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  z-index: 100;
  max-height: 320px;
  overflow-y: auto;
}
.search-results[hidden] { display: none; }

.search-result {
  display: block;
  padding: 0.6rem 0.9rem;
  text-decoration: none;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.search-result:last-child { border-bottom: none; }
.search-result:hover { background: var(--result-hover); }
.search-result-title { font-size: 0.875rem; font-weight: 600; color: var(--heading); }
.search-result-excerpt { font-size: 0.78rem; opacity: 0.6; margin-top: 0.15rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-no-results { padding: 0.8rem 0.9rem; font-size: 0.875rem; opacity: 0.5; }

/* ===== Navigation ===== */
.sidebar-nav { flex: 1; padding: 0.5rem 0 1rem; }

.explorer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.2rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
  cursor: pointer;
  user-select: none;
}

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

.nav-root { padding: 0 0.4rem; }

.nav-folder { margin: 0; }

.nav-folder-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--heading);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: 5px;
  text-align: left;
  transition: background 0.15s;
}
.nav-folder-btn:hover { background: var(--nav-hover); }

.folder-chevron {
  transition: transform 0.2s;
  flex-shrink: 0;
  opacity: 0.6;
}
.nav-folder-btn[aria-expanded="false"] .folder-chevron { transform: rotate(0deg); }
.nav-folder-btn[aria-expanded="true"] .folder-chevron { transform: rotate(90deg); }

.nav-folder > .nav-list {
  padding-left: 1.1rem;
  overflow: hidden;
  transition: max-height 0.2s ease;
}

.nav-file a {
  display: block;
  padding: 0.28rem 0.6rem;
  font-size: 0.875rem;
  color: var(--text);
  text-decoration: none;
  border-radius: 5px;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-file a:hover { background: var(--nav-hover); color: var(--heading); }
.nav-file.active a { background: var(--nav-active-bg); color: var(--nav-active-text); font-weight: 600; }

/* ===== Page Body ===== */
.page-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  position: relative;
}

.sidebar-toggle {
  display: none;
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem;
  cursor: pointer;
  color: var(--text);
}

/* ===== Content ===== */
.content {
  flex: 1;
  padding: 2.5rem 3rem;
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
}

.article { max-width: 100%; }

/* ===== Typography ===== */
.article h1, .article h2, .article h3,
.article h4, .article h5, .article h6 {
  color: var(--heading);
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.article #preamble + .sect1 h2,
.article > .sect1:first-child h2 { margin-top: 0; }

.article h1 { font-size: 2rem; margin-top: 0; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.article h2 { font-size: 1.45rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
.article h3 { font-size: 1.2rem; }
.article h4 { font-size: 1.05rem; }

.article p { margin-bottom: 1rem; }

.article a { color: var(--link); text-decoration: underline; text-decoration-color: transparent; transition: color 0.15s, text-decoration-color 0.15s; }
.article a:hover { color: var(--link-hover); text-decoration-color: var(--link-hover); }

.article strong { color: var(--heading); font-weight: 700; }
.article em { font-style: italic; }

/* ===== Asciidoc: Sections ===== */
.sect1, .sect2, .sect3, .sect4, .sect5, .sect6 { margin-bottom: 1.5rem; }
#preamble { margin-bottom: 1.5rem; }

/* ===== Asciidoc: Code ===== */
.listingblock, .literalblock {
  margin: 1rem 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.listingblock .title, .literalblock .title {
  font-size: 0.8rem;
  padding: 0.35rem 0.9rem;
  background: var(--border);
  color: var(--text);
  font-family: var(--font);
  opacity: 0.8;
}

.listingblock pre, .literalblock pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}

.listingblock pre code, .literalblock pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: inherit;
  color: inherit;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--inline-code-bg);
  color: var(--code-text);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre code { background: none; border: none; padding: 0; }

/* ===== Asciidoc: Admonitions ===== */
.admonitionblock {
  margin: 1.25rem 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid transparent;
}

.admonitionblock > table { display: block; }
.admonitionblock > table > tbody { display: block; }
.admonitionblock > table > tbody > tr { display: flex; flex-direction: column; }

.admonitionblock td.icon {
  padding: 0.38rem 1rem;
  font-size: 0;
  border-right: none;
  border-bottom: none;
  width: auto;
}

.admonitionblock td.icon i { font-size: 0; }

.admonitionblock td.icon i::after {
  font-style: normal;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #fff;
}

.admonitionblock.note td.icon i::after    { content: 'NOTE'; }
.admonitionblock.tip td.icon i::after     { content: 'TIP'; }
.admonitionblock.important td.icon i::after { content: 'IMPORTANT'; }
.admonitionblock.warning td.icon i::after { content: 'WARNING'; }
.admonitionblock.caution td.icon i::after { content: 'CAUTION'; }

.admonitionblock td.content {
  padding: 0.75rem 1rem;
  font-size: 0.925rem;
  background: var(--code-bg);
}

.admonitionblock.note   { border-color: #1a7fd4; }
.admonitionblock.note td.icon { background: #1a7fd4; }

.admonitionblock.tip    { border-color: #2ea866; }
.admonitionblock.tip td.icon  { background: #2ea866; }

.admonitionblock.warning  { border-color: #a8b800; }
.admonitionblock.warning td.icon { background: #b8cc00; }
.admonitionblock.warning td.icon i::after { color: #1a1a1a; }

.admonitionblock.caution  { border-color: #e08c1a; }
.admonitionblock.caution td.icon { background: #f5a623; }
.admonitionblock.caution td.icon i::after { color: #1a1a1a; }

.admonitionblock.important { border-color: #e02040; }
.admonitionblock.important td.icon { background: #f23d5c; }

[data-theme="light"] .admonitionblock td.content { background: #f8f4f4; }
[data-theme="light"] .admonitionblock.warning td.icon i::after  { color: #2a2a2a; }
[data-theme="light"] .admonitionblock.caution td.icon i::after  { color: #2a2a2a; }

/* ===== Asciidoc: Lists ===== */
.ulist, .olist, .dlist { margin: 0.75rem 0; }
.ulist ul, .olist ol { padding-left: 1.5rem; }
.ulist li, .olist li { margin-bottom: 0.3rem; }
.ulist ul { list-style: disc; }
.ulist ul ul { list-style: circle; margin-top: 0.2rem; }
.ulist ul ul ul { list-style: square; }
.olist ol { list-style: decimal; }
.olist ol ol { list-style: lower-alpha; margin-top: 0.2rem; }

/* ===== Asciidoc: Tables ===== */
.tableblock { width: 100%; overflow-x: auto; margin: 1rem 0; }
.tableblock table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.tableblock th, .tableblock td { padding: 0.55rem 0.85rem; border: 1px solid var(--table-border); text-align: left; }
.tableblock thead th { background: var(--table-header); color: var(--heading); font-weight: 700; }
.tableblock tbody tr:nth-child(even) { background: var(--table-stripe); }
.tableblock tbody tr:hover { background: var(--nav-hover); }

/* ===== Asciidoc: Images ===== */
.imageblock { margin: 1.25rem 0; }
.imageblock img { max-width: 100%; height: auto; border-radius: 6px; }
.imageblock.text-center { text-align: center; }
.imageblock[style*="text-align: center"] { text-align: center; }
.imageblock .title { font-size: 0.85rem; opacity: 0.65; margin-top: 0.4rem; text-align: center; }

.text-center { text-align: center; }

img { max-width: 100%; height: auto; }

/* ===== Asciidoc: Blockquote / Sidebar ===== */
.quoteblock {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1.2rem;
  margin: 1rem 0;
  background: var(--inline-code-bg);
  border-radius: 0 6px 6px 0;
  font-style: italic;
}
.quoteblock .attribution { font-size: 0.85rem; opacity: 0.65; font-style: normal; margin-top: 0.5rem; }

.sidebarblock {
  background: var(--search-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
  margin: 1.25rem 0;
}

/* ===== Asciidoc: Collapsible ===== */
details summary { cursor: pointer; font-weight: 600; color: var(--heading); padding: 0.3rem 0; }
details summary:hover { color: var(--link-hover); }
details[open] summary { margin-bottom: 0.5rem; }

/* ===== Asciidoc: Math ===== */
.stemblock {
  margin: 1rem 0;
  overflow-x: auto;
}
.stemblock .content {
  text-align: center;
  font-size: 1.05em;
}

/* ===== Asciidoc: Collapsible blocks ===== */
.exampleblock {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 1rem 0;
  background: var(--search-bg);
}

/* ===== Asciidoc: Highlight colors ===== */
.aqua { color: #00b5d8; }
.black { color: #1a1a1a; }
.blue { color: #4a9eff; }
.fuchsia { color: #e879f9; }
.gray { color: #9a9a9a; }
.green { color: #4ade80; }
.lime { color: #a3e635; }
.maroon { color: #be185d; }
.navy { color: #3b82f6; }
.olive { color: #a16207; }
.purple { color: #a855f7; }
.red { color: #f87171; }
.silver { color: #c0c0c0; }
.teal { color: #2dd4bf; }
.white { color: #f8fafc; }
.yellow { color: #fde047; }

/* ===== TOC Sidebar ===== */
.toc-sidebar {
  width: var(--toc-width);
  flex-shrink: 0;
  padding: 2rem 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-left: 1px solid var(--border);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.toc-sidebar::-webkit-scrollbar { width: 4px; }
.toc-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.toc-inner { padding: 0 1.2rem; }

.toc-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
  margin-bottom: 0.75rem;
}

.toc-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-nav li { margin-bottom: 0.2rem; }

.toc-nav ul ul { padding-left: 0.9rem; margin-top: 0.2rem; }

.toc-link {
  font-size: 0.82rem;
  color: var(--text);
  text-decoration: none;
  display: block;
  padding: 0.18rem 0.3rem;
  border-radius: 4px;
  line-height: 1.4;
  transition: color 0.15s, background 0.15s;
  opacity: 0.8;
}
.toc-link:hover { color: var(--heading); background: var(--nav-hover); opacity: 1; }
.toc-link.active { color: var(--toc-active); font-weight: 600; opacity: 1; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ===== Responsive ===== */
@media (max-width: 1200px) {
  .toc-sidebar { display: none; }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 150;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: flex; }
  .content { padding: 1.5rem 1.25rem 1.5rem 3.5rem; }
  .article h1 { font-size: 1.6rem; }
  .article h2 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .content { padding: 1.25rem 1rem 1.25rem 3rem; }
}

/* ===== Highlight.js theme override for light mode ===== */
[data-theme="light"] .listingblock pre,
[data-theme="light"] .literalblock pre {
  background: #f6f8fa;
  color: #24292e;
}

/* ===== Sidebar footer ===== */
.sidebar-footer {
  margin-top: auto;
  padding: 0.9rem 1.1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.sidebar-footer-link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--text);
  text-decoration: none;
  opacity: 0.55;
  transition: opacity 0.15s, color 0.15s;
  padding: 0.2rem 0;
}
.sidebar-footer-link:hover { opacity: 1; color: var(--link-hover); }

/* ===== Page footer ===== */
.page-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.15s, color 0.15s;
}
.footer-link:hover { opacity: 1; color: var(--link-hover); text-decoration: none; }

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.15rem;
  font-size: 0.8rem;
  opacity: 0.6;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.breadcrumb-link {
  color: var(--link);
  text-decoration: none;
  transition: color 0.15s;
}
.breadcrumb-link:hover { color: var(--link-hover); }

.breadcrumb-sep {
  margin: 0 0.2rem;
  opacity: 0.5;
}

.breadcrumb-item { color: var(--text); }

/* ===== Section anchors (sectanchors) ===== */
.article h1,
.article h2,
.article h3,
.article h4,
.article h5,
.article h6 {
  position: relative;
  display: flex;
  align-items: baseline;
  flex-wrap: nowrap;
}

.article h1 a.anchor,
.article h2 a.anchor,
.article h3 a.anchor,
.article h4 a.anchor,
.article h5 a.anchor,
.article h6 a.anchor {
  order: 2;
  position: static;
  transform: none;
  visibility: hidden;
  margin-left: 0.35rem;
  flex-shrink: 0;
  color: var(--link);
  text-decoration: none;
  font-weight: normal;
  font-size: 0.85em;
  opacity: 0.5;
}
.article h1 a.anchor::before,
.article h2 a.anchor::before,
.article h3 a.anchor::before,
.article h4 a.anchor::before,
.article h5 a.anchor::before,
.article h6 a.anchor::before { content: '#'; }

.article h1:hover a.anchor,
.article h2:hover a.anchor,
.article h3:hover a.anchor,
.article h4:hover a.anchor,
.article h5:hover a.anchor,
.article h6:hover a.anchor {
  visibility: visible;
}

/* ===== TOC Sidebar: external links section ===== */
.toc-links {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.toc-links-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
  margin-bottom: 0.4rem;
}

.toc-ext-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text);
  text-decoration: none;
  padding: 0.2rem 0.3rem;
  border-radius: 4px;
  opacity: 0.65;
  transition: opacity 0.15s, color 0.15s, background 0.15s;
}
.toc-ext-link:hover { opacity: 1; color: var(--link-hover); background: var(--nav-hover); }

/* ===== Link hover preview ===== */
.page-preview {
  position: fixed;
  z-index: 1000;
  max-width: 360px;
  min-width: 240px;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  font-size: 0.875rem;
  line-height: 1.5;
}
.page-preview.visible {
  opacity: 1;
  transform: translateY(0);
}
.page-preview-title {
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 0.45rem;
  font-size: 0.95rem;
}
.page-preview-excerpt {
  color: var(--text);
  opacity: 0.75;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}