:root {
  --sidebar-w: 280px;
  --toc-w: 220px;
  --content-max: 720px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'Noto Sans Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;

  --bg: #0a0f0a;
  --bg-sidebar: #0f1a0f;
  --text: #e8ede8;
  --text-muted: #8fa38f;
  --text-light: #5c6e5c;
  --primary: #22c55e;
  --primary-light: #0a1f0e;
  --accent: #f59e0b;
  --accent-light: #1a1500;
  --border: #1a2e1a;
  --border-light: #152515;
  --code-bg: #0d160d;
  --hover-bg: #122012;
}

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

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* -- Top Bar -- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 1.25rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.topbar-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1rem;
}
.topbar-logo svg { flex-shrink: 0; }
.topbar-logo:hover { color: var(--primary); }

.menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  color: var(--text-muted);
}
.menu-btn:hover { background: var(--hover-bg); }

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.topbar-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}
.topbar-icon:hover {
  color: var(--text);
  border-color: var(--primary);
}

/* Search trigger (button in topbar) */
.topbar-search {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  width: 260px;
  padding: 6px 8px 6px 10px;
  font-family: var(--font);
  font-size: 0.8rem;
  background: var(--code-bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, color 0.15s;
}
.topbar-search:hover {
  border-color: var(--primary);
  color: var(--text);
}
.topbar-search:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}
.topbar-search svg {
  flex-shrink: 0;
  color: var(--text-light);
}
.topbar-search span {
  flex: 1;
  text-align: left;
}
.topbar-search kbd {
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  line-height: 1;
}

/* Search modal */
#search-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  font-family: var(--font);
}
#search-modal[hidden] { display: none; }
.search-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.search-dialog {
  position: absolute;
  top: 12%;
  left: 50%;
  transform: translateX(-50%);
  width: 92%;
  max-width: 640px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
  overflow: hidden;
}
.search-dialog-header {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.search-dialog-header svg {
  flex-shrink: 0;
  color: var(--text-light);
}
#search-input {
  flex: 1;
  font-family: var(--font);
  font-size: 0.95rem;
  background: transparent;
  color: var(--text);
  border: none;
  outline: none;
  padding: 4px 0;
}
#search-input::placeholder { color: var(--text-light); }
#search-close {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.7rem;
  cursor: pointer;
  line-height: 1.4;
}
#search-close:hover { color: var(--text); border-color: var(--primary); }
#search-results {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
#search-results::-webkit-scrollbar { width: 6px; }
#search-results::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.search-result {
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s;
}
.search-result + .search-result { margin-top: 2px; }
.search-result:hover,
.search-result.selected { background: var(--hover-bg); }
.search-result-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 2px;
}
.search-result-description {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
}
.search-result-content {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 4px;
  line-height: 1.45;
  font-family: var(--mono);
}
.search-result mark {
  background: rgba(34, 197, 94, 0.22);
  color: var(--text);
  padding: 0 2px;
  border-radius: 2px;
}
.search-empty {
  padding: 1.5rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* -- Layout -- */
.layout {
  display: flex;
  min-height: calc(100vh - 52px);
}

/* -- Sidebar -- */
.sidebar {
  position: sticky;
  top: 52px;
  width: var(--sidebar-w);
  height: calc(100vh - 52px);
  overflow-y: auto;
  padding: 1.25rem 0;
  border-right: 1px solid var(--border);
  background: var(--bg-sidebar);
  flex-shrink: 0;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }

.sidebar-section { margin-bottom: 0.25rem; }
.sidebar-heading {
  display: block;
  padding: 0.35rem 1.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.sidebar-nav { list-style: none; }
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 1.25rem 0.3rem 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.sidebar-nav a:hover {
  color: var(--text);
  background: var(--hover-bg);
}
.sidebar-nav a.active {
  color: var(--primary);
  font-weight: 500;
  background: var(--primary-light);
  border-left-color: var(--primary);
}

/* Nested nav */
.sidebar-nav .nested { list-style: none; }
.sidebar-nav .nested a {
  padding-left: 2.25rem;
  font-size: 0.825rem;
}
.sidebar-nav .nested .nested a {
  padding-left: 3rem;
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  width: 100%;
  padding: 0.3rem 1.25rem 0.3rem 1.5rem;
  font-family: var(--font);
  font-size: 0.875rem;
  color: var(--text-muted);
  background: none;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  text-align: left;
  transition: color 0.15s, background 0.15s;
}
.sidebar-toggle:hover {
  color: var(--text);
  background: var(--hover-bg);
}
.sidebar-toggle .arrow {
  display: inline-block;
  width: 16px;
  text-align: center;
  font-size: 0.7rem;
  transition: transform 0.2s;
}
.sidebar-toggle.open .arrow { transform: rotate(90deg); }

/* -- Main Content -- */
.main {
  flex: 1;
  min-width: 0;
  padding: 2rem 2.5rem;
  max-width: calc(var(--content-max) + 5rem);
}

/* -- Prose -- */
.prose h1 { font-size: 1.75rem; font-weight: 700; margin: 0 0 0.75rem; line-height: 1.3; color: var(--text); }
.prose h2 { font-size: 1.35rem; font-weight: 600; margin: 2rem 0 0.5rem; padding-bottom: 0.35rem; border-bottom: 1px solid var(--border); line-height: 1.3; color: var(--text); }
.prose h3 { font-size: 1.1rem; font-weight: 600; margin: 1.5rem 0 0.4rem; line-height: 1.3; color: var(--text); }
.prose h4 { font-size: 0.95rem; font-weight: 600; margin: 1.25rem 0 0.35rem; color: var(--text); }
.prose p { margin: 0.75rem 0; color: var(--text); }
.prose a { color: var(--primary); text-decoration: none; }
.prose a:hover { text-decoration: underline; }
.prose strong { font-weight: 600; color: var(--text); }
.prose img { max-width: 100%; border-radius: 8px; margin: 1rem 0; }
.prose blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--primary);
  background: var(--primary-light);
  border-radius: 0 6px 6px 0;
  color: var(--text);
}
.prose blockquote p { margin: 0.25rem 0; }
.prose ul, .prose ol { margin: 0.75rem 0; padding-left: 1.5rem; }
.prose li { margin: 0.25rem 0; color: var(--text); }
.prose li::marker { color: var(--text-muted); }
.prose code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--primary);
}
.prose pre {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.5;
}
.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text);
}
.prose table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
.prose th, .prose td { padding: 0.5rem 0.75rem; border: 1px solid var(--border); text-align: left; }
.prose th { background: var(--code-bg); font-weight: 600; color: var(--text); }
.prose td { color: var(--text-muted); }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* -- Page Navigation -- */
.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.page-nav a {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.75rem 1rem;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  flex: 1;
  max-width: 50%;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.page-nav a:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.08);
}
.page-nav a .label {
  font-size: 0.75rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.page-nav a .title { font-size: 0.9rem; color: var(--primary); font-weight: 500; }
.page-nav .next { text-align: right; margin-left: auto; }

/* -- Section list -- */
ul.section-list { list-style: none; margin: 1rem 0; }
ul.section-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}
ul.section-list li:last-child { border-bottom: none; }
ul.section-list li a { color: var(--primary); text-decoration: none; font-weight: 500; }
ul.section-list li a:hover { text-decoration: underline; }
nav.pagination { margin: 1.5rem 0; }
nav.pagination .pagination-list { list-style: none; display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
nav.pagination a { display: inline-block; padding: 0.25rem 0.55rem; border-radius: 6px; border: 1px solid var(--border); color: var(--text-muted); text-decoration: none; font-size: 0.85rem; }
nav.pagination a:hover { color: var(--primary); border-color: var(--primary); }
.pagination-current span { display: inline-block; padding: 0.25rem 0.55rem; border-radius: 6px; border: 1px solid var(--primary); background: var(--primary-light); font-size: 0.85rem; }
.pagination-disabled span { display: inline-block; padding: 0.25rem 0.55rem; border-radius: 6px; border: 1px solid var(--border); color: var(--text-muted); opacity: 0.5; font-size: 0.85rem; }

/* -- Footer -- */
.site-footer {
  padding: 1.5rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-light);
  font-size: 0.8rem;
}
.site-footer a { color: var(--text-muted); text-decoration: none; }
.site-footer a:hover { color: var(--primary); }

/* -- Alert shortcode -- */
.alert { padding: 0.75rem 1rem; border-radius: 6px; margin: 1rem 0; font-size: 0.9rem; border-left: 4px solid; }
.alert-info { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }
.alert-warning { background: var(--accent-light); border-color: var(--accent); color: var(--accent); }
.alert-danger { background: #1a0508; border-color: #ef4444; color: #ef4444; }
.alert-tip { background: var(--primary-light); border-color: #22c55e; color: #22c55e; }

/* -- Hint shortcode -- */
.hint { padding: 0.75rem 1rem; border-radius: 6px; margin: 1rem 0; font-size: 0.9rem; border-left: 4px solid; }
.hint-info { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }
.hint-warning { background: var(--accent-light); border-color: var(--accent); color: var(--accent); }
.hint-danger { background: #1a0508; border-color: #ef4444; color: #ef4444; }

/* -- Responsive -- */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -100%;
    top: 52px;
    z-index: 90;
    width: 280px;
    transition: left 0.25s ease;
    box-shadow: none;
  }
  .sidebar.open {
    left: 0;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.4);
  }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: 52px;
    z-index: 80;
    background: rgba(0, 0, 0, 0.6);
  }
  .sidebar-overlay.open { display: block; }
  .menu-btn { display: block; }
  .main { padding: 1.5rem 1rem; }
  .site-footer { padding: 1.5rem 1rem; }
  .page-nav { flex-direction: column; }
  .page-nav a { max-width: 100%; }
  .topbar-search { width: auto; padding: 6px 10px; }
  .topbar-search span,
  .topbar-search kbd { display: none; }
}