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

html {
  font-size: var(--font-size);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  line-height: var(--line-height);
  color: var(--c-text);
  background: var(--c-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--c-link);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--c-link-hover); text-decoration: underline; }

/* ── Layout grid ──────────────────────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}
.layout.has-toc {
  grid-template-columns: var(--sidebar-w) 1fr var(--toc-w);
}

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

.sidebar-header {
  padding: 1rem 1rem 0.875rem;
  border-bottom: var(--border-width) solid var(--c-border);
  flex-shrink: 0;
}

.site-title {
  font-weight: 700;
  color: var(--c-text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.site-title:hover { text-decoration: none; color: var(--c-text); opacity: 0.7; }

/* ── Sidebar footer (settings) ────────────────────────────────────────────── */
.sidebar-footer {
  flex-shrink: 0;
  border-top: var(--border-width) solid var(--c-border);
  padding: 0.4rem 0;
}

/* ── Settings button ─────────────────────────────────────────────────── */
.settings-btn {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  color: var(--c-text-muted);
  padding: 0.28rem 1rem;
  font-family: var(--font);
  font-size: 0.8125rem;
  text-align: left;
  transition: color var(--transition), border-color var(--transition);
}
.settings-btn:hover {
  color: var(--c-text);
  border-left-color: var(--c-border);
  text-decoration: none;
}

/* ── Search box ───────────────────────────────────────────────────────────── */
.search-box {
  padding: 0.75rem 1rem;
  border-bottom: var(--border-width) solid var(--c-border);
  position: relative;
  flex-shrink: 0;
}

#search-input {
  width: 100%;
  padding: 0.375rem 0.75rem;
  border: var(--border-width) solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 0.8125rem;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--transition);
}
#search-input::placeholder { color: var(--c-text-muted); }
#search-input:focus { border-color: var(--c-text); }

#search-results {
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  top: calc(100% - 0.5rem);
  background: var(--c-bg);
  border: var(--border-width) solid var(--c-border);
  border-radius: var(--radius);
  z-index: 100;
  max-height: 320px;
  overflow-y: auto;
  list-style: none;
}
#search-results li a {
  display: block;
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--c-text);
  border-bottom: var(--border-width) solid var(--c-border);
}
#search-results li:last-child a { border-bottom: none; }
#search-results li a:hover,
#search-results li a:focus {
  background: var(--c-bg-hover);
  text-decoration: none;
}
#search-results .result-excerpt {
  display: block;
  font-size: 0.7rem;
  color: var(--c-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 0.1rem;
}

/* ── File tree navigation ─────────────────────────────────────────────────── */
.file-tree  { padding: 0.5rem 0; flex: 1; }
.nav-list,
.nav-sublist { list-style: none; }

.nav-folder-name {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 1rem;
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text-muted);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.nav-folder-name::before {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid currentColor;
  opacity: 0.45;
  flex-shrink: 0;
  transition: transform 0.15s ease;
}
details[open] > .nav-folder-name::before {
  transform: rotate(90deg);
}
.nav-folder-name:hover { color: var(--c-text); }
.nav-folder-name:hover::before { opacity: 0.7; }
.nav-sublist { padding-left: 0.75rem; }

.nav-link {
  display: block;
  padding: 0.28rem 1rem;
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-link:hover { color: var(--c-text); text-decoration: none; border-left-color: var(--c-border); }
.nav-item.active .nav-link {
  color: var(--c-nav-active);
  border-left-color: var(--c-nav-pip);
  font-weight: 600;
}

/* ── Main content area ────────────────────────────────────────────────────── */
.content {
  grid-column: 2;
  min-width: 0;
  padding: 2.5rem 3rem 5rem;
}
.content-inner {
  
}

/* ── Breadcrumbs ──────────────────────────────────────────────────────────── */
.breadcrumbs {
  font-size: 0.75rem;
  color: var(--c-text-muted);
  letter-spacing: 0.01em;
  margin-bottom: 1.75rem;
}
.breadcrumbs a { color: var(--c-text-muted); }
.breadcrumbs a:hover { color: var(--c-link); text-decoration: none; }
.breadcrumb-sep { margin: 0 0.3rem; opacity: 0.5; }

/* ── Page title ───────────────────────────────────────────────────────────── */
.page-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: var(--border-width) solid var(--c-border);
}

/* ── Article typography ───────────────────────────────────────────────────── */
.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4,
.page-content h5,
.page-content h6 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-top: 2.25em;
  margin-bottom: 0.6em;
  scroll-margin-top: 1rem;
}
.page-content h1 { font-size: 1.5rem; }
.page-content h2 {
  font-size: 1.2rem;
  padding-bottom: 0.35em;
  border-bottom: var(--border-width) solid var(--c-border);
}
.page-content h3 { font-size: 1.05rem; }
.page-content h4 { font-size: 0.9375rem; }

.page-content p   { margin-bottom: 1.1em; }
.page-content ul,
.page-content ol  { padding-left: 1.75em; margin-bottom: 1em; }
.page-content li  { margin-bottom: 0.3em; }

.page-content hr {
  border: none;
  border-top: var(--border-width) solid var(--c-border);
  margin: 2.5em 0;
}

.page-content blockquote {
  border-left: 2px solid var(--c-border);
  padding: 0.2em 1em;
  color: var(--c-text-muted);
  margin: 1.25em 0;
  font-style: italic;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  font-size: 0.875rem;
}
.page-content th,
.page-content td {
  border: var(--border-width) solid var(--c-border);
  padding: 0.5em 0.8em;
  text-align: left;
}
.page-content th {
  background: var(--c-bg-sidebar);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.page-content img {
  max-width: 100%;
  height: auto;
  border: var(--border-width) solid var(--c-border);
}

/* ── TOC ──────────────────────────────────────────────────────────────────── */
.toc {
  grid-column: 3;
  padding: 2.5rem 1rem 2rem 0;
  border-left: var(--border-width) solid var(--c-border);
}
.toc-inner {
  position: sticky;
  top: 1.5rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
  padding-left: 1rem;
}
.toc-heading {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-muted);
  margin-bottom: 0.75rem;
}
.toc-list  { list-style: none; }
.toc-list a {
  display: block;
  font-size: 0.775rem;
  color: var(--c-text-muted);
  padding: 0.2rem 0 0.2rem 0.5rem;
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  line-height: 1.4;
}
.toc-list a:hover { color: var(--c-link); text-decoration: none; border-left-color: var(--c-border); }
.toc-h3 { padding-left: 1.25rem; }
.toc-h4 { padding-left: 2rem; }

/* ── Sidebar toggle (mobile) ──────────────────────────────────────────────── */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 0.875rem;
  left: 0.875rem;
  z-index: 200;
  background: var(--c-bg);
  border: var(--border-width) solid var(--c-border);
  border-radius: var(--radius);
  width: 36px;
  height: 36px;
  cursor: pointer;
  color: var(--c-text);
  font-size: 1rem;
  line-height: 1;
  align-items: center;
  justify-content: center;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .toc { display: none; }
  .layout.has-toc {
    grid-template-columns: var(--sidebar-w) 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar-toggle { display: flex; }

  .layout,
  .layout.has-toc {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    width: var(--sidebar-w);
    height: 100%;
    z-index: 150;
    transition: left 0.2s ease;
    border-right: var(--border-width) solid var(--c-border);
  }
  .sidebar.open { left: 0; }

  .content {
    grid-column: 1;
    padding: 1.25rem 1.25rem 4rem;
  }
}

/* ══════════════════════════════════════════════════════════════════════════
   SETTINGS PANEL
   ══════════════════════════════════════════════════════════════════════════ */

/* Overlay */
#settings-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.25);
  z-index: 500;
  backdrop-filter: blur(1px);
}
#settings-overlay.open { display: block; }

/* Panel */
#settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 288px;
  background: var(--c-bg);
  border-left: var(--border-width) solid var(--c-border);
  z-index: 501;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.2s ease;
}
#settings-panel.open { transform: translateX(0); }

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: var(--border-width) solid var(--c-border);
  flex-shrink: 0;
}
.settings-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-muted);
}
#settings-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-text-muted);
  padding: 0.25rem;
  display: flex;
  align-items: center;
  border-radius: var(--radius);
  transition: color var(--transition);
}
#settings-close:hover { color: var(--c-text); }

.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
}

.settings-section {
  margin-bottom: 2rem;
}
.settings-section:last-child { margin-bottom: 0; }

.settings-section-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-muted);
  margin-bottom: 0.75rem;
}

/* Theme cards */
.theme-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.theme-card {
  background: none;
  border: var(--border-width) solid var(--c-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition);
  text-align: left;
}
.theme-card:hover { border-color: var(--c-text-muted); }
.theme-card.active {
  border-color: var(--c-text);
  border-width: 2px;
}

.theme-card-preview {
  height: 52px;
  display: flex;
  border-bottom: 1px solid;
  overflow: hidden;
}
.theme-card-preview-sidebar {
  width: 30%;
  height: 100%;
  flex-shrink: 0;
  border-right: 1px solid;
}
.theme-card-preview-lines {
  flex: 1;
  padding: 10px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  justify-content: center;
}
.theme-card-preview-lines span {
  display: block;
  height: 3px;
  border-radius: 2px;
}

.theme-card-name {
  font-size: 0.675rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-text-muted);
  padding: 0.35rem 0.6rem;
  text-transform: uppercase;
}
.theme-card.active .theme-card-name { color: var(--c-text); }

/* Font size buttons */
.font-size-btns {
  display: flex;
  gap: 0.5rem;
}
.font-size-btn {
  flex: 1;
  font-family: var(--font);
  background: none;
  border: var(--border-width) solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text-muted);
  cursor: pointer;
  padding: 0.5rem 0;
  font-weight: 600;
  transition: border-color var(--transition), color var(--transition);
}
.font-size-btn:hover   { color: var(--c-text); border-color: var(--c-text-muted); }
.font-size-btn.active  { color: var(--c-text); border-color: var(--c-text); }
.font-size-btn[data-font-size="13"] { font-size: 0.8125rem; }
.font-size-btn[data-font-size="15"] { font-size: 0.9375rem; }
.font-size-btn[data-font-size="17"] { font-size: 1.0625rem; }

/* Admin link in settings panel */
.admin-panel-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text-muted);
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: color var(--transition), border-color var(--transition);
}
.admin-panel-link:hover {
  color: var(--c-text);
  border-color: var(--c-text-muted);
}

/* Custom (user-installed) theme card */
.theme-card-preview--custom {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg-hover);
}
.theme-card-preview--custom::after {
  content: '\2726';
  font-size: 1rem;
  color: var(--c-text-muted);
}

@media (max-width: 768px) {
  #settings-panel { width: 100%; }
}