:root{--color-bg:#faf8f8;--color-text:#2b2b2b;--color-primary:#284b63;--color-accent:#84a59d;--color-muted:#6b6b6b;--color-border:#e5e5e5;--color-surface:#ffffff;--font-heading:Inter, system-ui, -apple-system, sans-serif;--font-body:Inter, system-ui, -apple-system, sans-serif;--font-code:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;}
:root[data-theme="dark"]{--color-bg:#161618;--color-text:#ebebec;--color-primary:#7b97aa;--color-accent:#84a59d;--color-muted:#a0a0a0;--color-border:#33333a;--color-surface:#1e1e22}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--color-bg:#161618;--color-text:#ebebec;--color-primary:#7b97aa;--color-accent:#84a59d;--color-muted:#a0a0a0;--color-border:#33333a;--color-surface:#1e1e22}}
/* mdgarden default theme. Colours/fonts come from CSS variables injected by the
   build (from mdgarden.config.json); this file is the static layout + components. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* ---- Layout ------------------------------------------------------------- */

.nav-link {
  color: var(--color-muted);
  font-size: 0.95rem;
}
.nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-muted);
  cursor: pointer;
  font-size: 1rem;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.icon-button:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 8%, var(--color-surface));
}

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 240px;
  gap: 2rem;
  max-width: 1220px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  align-items: start;
}
.layout.no-right {
  grid-template-columns: 240px minmax(0, 1fr);
}
.graph-panel {
  margin-top: 1.5rem;
}

.sidebar {
  position: sticky;
  top: 1.5rem;
  font-size: 0.9rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
  padding: 0.25rem;
}
.sidebar h2 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin: 0 0 0.75rem;
  padding: 0.25rem 0.5rem;
  font-weight: 600;
}

/* ---- Sidebar header (site title, nav, search trigger) ------------------ */

.sidebar-header {
  padding: 0.25rem 0.5rem 1rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}
.sidebar-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.sidebar-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: 0 0 0.6rem;
  border-radius: 14px;
  overflow: hidden;
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
  text-decoration: none;
  flex-shrink: 0;
}
.sidebar-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.sidebar-logo-emoji {
  font-size: 1.8rem;
  line-height: 1;
}
.site-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-primary);
}
.sidebar-nav {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.icon-button-sm {
  width: 28px;
  height: 28px;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.search-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.85rem;
  font-family: var(--font-body);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.search-trigger:hover {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 6%, var(--color-surface));
}
.search-trigger-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mobile-bar {
  display: none;
}
.sidebar-backdrop {
  display: none;
}

.sidebar-profile {
  padding: 0.25rem 0.5rem 1rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}
.sidebar-profile-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}
.sidebar-profile-bio {
  margin: 0.3rem 0 0;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--color-muted);
}

.page-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.page-list a {
  color: var(--color-muted);
  display: block;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.page-list a:hover,
.page-list a.is-active {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  text-decoration: none;
}

/* ---- Explorer (folder tree) -------------------------------------------- */

.explorer-list,
.explorer-children {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.explorer-children {
  padding-left: 1rem;
  margin-left: 0;
  margin-top: 0.15rem;
  display: none;
  border-left: 1.5px solid color-mix(in srgb, var(--color-border) 60%, transparent);
}
.explorer-folder.is-open > .explorer-children {
  display: flex;
}
.explorer-file a,
.folder-label {
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.15s ease, background 0.15s ease;
  font-size: 0.88rem;
}
/* Files have no chevron, so indent them to line up under folder labels. */
.explorer-file a {
  padding-left: 1.75rem;
}
.explorer-file a:hover,
a.folder-label:hover {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  text-decoration: none;
}
.explorer-file a.is-active {
  color: var(--color-text);
  font-weight: 500;
  background: color-mix(in srgb, var(--color-primary) 18%, transparent);
  box-shadow: inset 2px 0 0 var(--color-primary);
}
.folder-label {
  font-weight: 600;
  color: var(--color-text);
  flex: 1;
  min-width: 0;
}
.explorer-folder {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}
.explorer-folder > .explorer-children {
  flex: 1 0 100%;
}
.folder-toggle {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  padding: 0;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease, background 0.2s ease;
  font-size: 0.65rem;
}
.folder-toggle:hover {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
}
.folder-toggle::before {
  content: '▸';
}
.explorer-folder.is-open > .folder-toggle::before {
  content: '▾';
}

/* ---- Breadcrumbs -------------------------------------------------------- */

.breadcrumbs {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}
.breadcrumbs a {
  color: var(--color-muted);
}
.breadcrumbs a:hover {
  color: var(--color-text);
}
.crumb-sep {
  margin: 0 0.4rem;
  opacity: 0.5;
}
.reading-time {
  white-space: nowrap;
}

/* ---- Figures ------------------------------------------------------------ */

.md-figure {
  margin: 1.5rem 0;
  text-align: center;
}
.md-figure img {
  margin: 0 auto;
}
.md-figure figcaption {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-top: 0.4rem;
}

/* ---- TOC ---------------------------------------------------------------- */

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--color-border);
}
.toc-list a {
  display: block;
  padding: 0.15rem 0.75rem;
  color: var(--color-muted);
  font-size: 0.85rem;
  border-left: 2px solid transparent;
  margin-left: -2px;
}
.toc-list a:hover {
  color: var(--color-text);
  text-decoration: none;
}
.toc-list .toc-h3 {
  padding-left: 1.5rem;
}

/* ---- Article ------------------------------------------------------------ */

.content {
  min-width: 0;
}
.page-title {
  font-family: var(--font-heading);
  font-size: 2.1rem;
  line-height: 1.2;
  margin: 0 0 0.5rem;
}
.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}
.tag {
  display: inline-block;
  padding: 0.05rem 0.5rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--color-accent) 18%, transparent);
  color: var(--color-text);
  font-size: 0.78rem;
}
.tag:hover {
  text-decoration: none;
  background: color-mix(in srgb, var(--color-accent) 30%, transparent);
}

.content h1,
.content h2,
.content h3,
.content h4 {
  font-family: var(--font-heading);
  line-height: 1.25;
  scroll-margin-top: 5rem;
}
.content h2 {
  margin-top: 2.2rem;
  padding-bottom: 0.2rem;
  border-bottom: 1px solid var(--color-border);
}
.content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}
.content blockquote {
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  border-left: 3px solid var(--color-accent);
  color: var(--color-muted);
}
.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.content th,
.content td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
.content th {
  background: var(--color-surface);
}
.content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

/* code */
.content :not(pre) > code {
  font-family: var(--font-code);
  font-size: 0.875em;
  background: color-mix(in srgb, var(--color-muted) 18%, transparent);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}
.content pre {
  font-family: var(--font-code);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.5;
}
.content pre code {
  background: none;
  padding: 0;
}

/* task lists */
.content .task-list-item {
  list-style: none;
}
.content .task-list-item input {
  margin-right: 0.5rem;
}

/* ---- Wikilinks ---------------------------------------------------------- */

.wikilink-broken {
  color: var(--color-muted);
  border-bottom: 1px dashed var(--color-muted);
  cursor: help;
}
.wikilink-broken:hover {
  text-decoration: none;
}

/* ---- Callouts ----------------------------------------------------------- */

.callout {
  --callout-color: var(--color-primary);
  margin: 1.25rem 0;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--callout-color) 35%, var(--color-border));
  border-left: 4px solid var(--callout-color);
  background: color-mix(in srgb, var(--callout-color) 8%, transparent);
}
.callout-title {
  font-weight: 700;
  color: var(--callout-color);
  margin: 0 0 0.25rem;
}
.callout > :last-child {
  margin-bottom: 0;
}
.callout[data-callout="tip"],
.callout[data-callout="hint"],
.callout[data-callout="success"],
.callout[data-callout="check"] {
  --callout-color: #2e9e6b;
}
.callout[data-callout="warning"],
.callout[data-callout="caution"],
.callout[data-callout="attention"] {
  --callout-color: #d99e34;
}
.callout[data-callout="danger"],
.callout[data-callout="error"],
.callout[data-callout="bug"],
.callout[data-callout="failure"] {
  --callout-color: #d9534f;
}
.callout[data-callout="info"],
.callout[data-callout="note"],
.callout[data-callout="abstract"] {
  --callout-color: var(--color-primary);
}
.callout[data-callout="question"],
.callout[data-callout="example"],
.callout[data-callout="quote"] {
  --callout-color: var(--color-accent);
}

/* ---- Backlinks ---------------------------------------------------------- */

.backlinks {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
}
.backlink-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.backlink-item {
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  font-size: 0.82rem;
}
.backlink-item a {
  white-space: normal;
}

/* ---- Footer ------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}
.site-footer a {
  color: var(--color-muted);
  margin: 0 0.4rem;
}

/* ---- Tag index ---------------------------------------------------------- */

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---- Search (Phase B) --------------------------------------------------- */

.search-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  background: color-mix(in srgb, #000 45%, transparent);
}
.search-modal.is-open {
  display: flex;
}
.search-box {
  width: min(640px, 92vw);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}
.search-box input {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--color-border);
  background: none;
  color: var(--color-text);
  font-size: 1.1rem;
  padding: 1rem 1.25rem;
  outline: none;
  font-family: var(--font-body);
}
.search-results {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  max-height: 50vh;
  overflow-y: auto;
}
.search-results li a {
  display: block;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  color: var(--color-text);
}
.search-results li a:hover,
.search-results li a.is-active {
  background: color-mix(in srgb, var(--color-primary) 14%, transparent);
  text-decoration: none;
}
.search-result-excerpt {
  display: block;
  color: var(--color-muted);
  font-size: 0.82rem;
  margin-top: 0.15rem;
}

/* ---- Graph (Phase B) ---------------------------------------------------- */

.graph-toggle {
  display: inline-flex;
  margin-top: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}
.graph-toggle-btn {
  border: 0;
  background: var(--color-surface);
  color: var(--color-muted);
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
  transition: background 0.15s ease, color 0.15s ease;
}
.graph-toggle-btn + .graph-toggle-btn {
  border-left: 1px solid var(--color-border);
}
.graph-toggle-btn:hover {
  color: var(--color-text);
}
.graph-toggle-btn.is-active {
  background: color-mix(in srgb, var(--color-primary) 16%, transparent);
  color: var(--color-text);
  font-weight: 600;
}
.graph {
  position: relative;
  margin-top: 0.75rem;
}
.graph canvas {
  width: 100%;
  height: 220px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  touch-action: none;
}
.graph-tooltip {
  position: absolute;
  z-index: 5;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.78rem;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ---- Responsive --------------------------------------------------------- */

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) 240px;
  }
  .sidebar-left {
    display: none;
  }
  .mobile-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 20;
    background: color-mix(in srgb, var(--color-bg) 88%, transparent);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
  }
  body.sidebar-open .sidebar-left {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 85vw);
    z-index: 30;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    box-shadow: 0 0 24px rgba(0, 0, 0, 0.25);
    padding: 1rem;
    overflow-y: auto;
    max-height: 100vh;
  }
  body.sidebar-open .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(0, 0, 0, 0.4);
  }
}
@media (max-width: 760px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    padding: 1.25rem 1rem 3rem;
  }
  /* Single column: let the right rail (TOC, graph, backlinks) flow below the article. */
  .sidebar-right {
    position: static;
    max-height: none;
    overflow: visible;
    margin-top: 2rem;
  }
  .sidebar-nav {
    display: none;
  }
}

/* ---- Shiki dual-theme syntax highlighting ------------------------------- */

.content pre.shiki {
  background-color: var(--shiki-light-bg);
}
.shiki,
.shiki span {
  color: var(--shiki-light);
}
:root[data-theme="dark"] .content pre.shiki {
  background-color: var(--shiki-dark-bg);
}
:root[data-theme="dark"] .shiki,
:root[data-theme="dark"] .shiki span {
  color: var(--shiki-dark);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .content pre.shiki {
    background-color: var(--shiki-dark-bg);
  }
  :root:not([data-theme="light"]) .shiki,
  :root:not([data-theme="light"]) .shiki span {
    color: var(--shiki-dark);
  }
}

/* ---- Math (KaTeX) ------------------------------------------------------- */

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5rem 0;
}

/* ---- "Built with mdgarden" badge ------------------------------------------ */

.powered-by-mdgarden {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  font-size: 0.75rem;
  opacity: 0.5;
  color: var(--color-muted);
  text-decoration: none;
  z-index: 100;
}
.powered-by-mdgarden:hover {
  opacity: 0.7;
}

/* ==========================================================================
   Popover (Link Hover Previews)
   ========================================================================== */
.md-popover {
  position: absolute;
  z-index: 1000;
  width: 400px;
  max-width: 90vw;
  max-height: 300px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1), 0 4px 10px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  pointer-events: none;
}

[data-theme='dark'] .md-popover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 4px 10px rgba(0, 0, 0, 0.3);
}

.md-popover.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.md-popover-inner {
  padding: 1.5rem;
  overflow-y: auto;
  max-height: 300px;
  font-size: 0.9em;
}

.md-popover-inner h1 {
  font-size: 1.25em;
  margin-top: 0;
}

.md-popover-inner p:last-child {
  margin-bottom: 0;
}