/* ── Tokens ── */
:root {
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-sans: 'Inter', system-ui, sans-serif;

  --radius: 6px;
  --sidebar-w: 220px;
  --transition: 0.2s ease;
}

/* ── Light theme ── */
[data-theme="light"] {
  --bg:          #f8f9fa;
  --bg-sidebar:  #ffffff;
  --bg-card:     #ffffff;
  --bg-code:     #f1f3f5;
  --bg-tag:      #e8f4fd;
  --bg-hover:    #f0f4ff;
  --bg-active:   #e8edff;

  --border:      #e2e8f0;
  --border-subtle: #edf2f7;

  --text:        #1a202c;
  --text-muted:  #718096;
  --text-code:   #c7254e;

  --accent:      #4361ee;
  --accent-soft: #eef0ff;
  --accent-2:    #7c3aed;

  --tag-unique:  #0d6efd;
  --tag-inherited: #6c757d;
  --tag-method:  #198754;

  --shadow:      0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
}

/* ── Dark theme ── */
[data-theme="dark"] {
  --bg:          #0f1117;
  --bg-sidebar:  #161b22;
  --bg-card:     #1c2128;
  --bg-code:     #161b22;
  --bg-tag:      #1a2744;
  --bg-hover:    #21262d;
  --bg-active:   #1f2d5a;

  --border:      #30363d;
  --border-subtle: #21262d;

  --text:        #e6edf3;
  --text-muted:  #8b949e;
  --text-code:   #ff7b72;

  --accent:      #7289ff;
  --accent-soft: #1a1f3a;
  --accent-2:    #a78bfa;

  --tag-unique:  #58a6ff;
  --tag-inherited: #8b949e;
  --tag-method:  #3fb950;

  --shadow:      0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:   0 4px 6px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

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

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), background var(--transition);
  z-index: 100;
}

.sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0;
}

.sidebar-logo span {
  color: var(--text-muted);
  font-weight: 400;
}

.sidebar-search {
  margin: 12px 12px 0;
  position: relative;
}

.sidebar-search input {
  width: 100%;
  padding: 7px 10px 7px 30px;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 12px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition);
}

.sidebar-search input:focus {
  border-color: var(--accent);
}

.sidebar-search input::placeholder { color: var(--text-muted); }

.sidebar-search svg {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.sidebar-section {
  padding: 16px 0 8px;
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 16px 6px;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all var(--transition);
}

.sidebar-nav a:hover {
  color: var(--text);
  background: var(--bg-hover);
}

.sidebar-tag-code {
  font-family: var(--font-mono);
  font-size: 12px;
}

.sidebar-nav a.active {
  color: var(--accent);
  background: var(--bg-active);
  border-left-color: var(--accent);
  font-weight: 500;
}

.sidebar-nav a.active .tag {
  color: var(--accent);
}

.sidebar-nav .tag {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-code);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text-muted);
  margin-left: auto;
}

.sidebar-empty {
  padding: 8px 16px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Main content ── */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
}

/* ── Topbar ── */
.topbar {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 50;
  transition: background var(--transition);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  min-width: 0;
}

.topbar-left a {
  color: var(--text-muted);
  text-decoration: none;
}

.topbar-left a:hover { color: var(--accent); }

.topbar-left .sep { color: var(--border); }

.topbar-left span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Page content ── */
.content {
  max-width: 860px;
  padding: 40px 32px 80px;
}

/* ── Page header ── */
.page-header {
  margin-bottom: 36px;
}

.element-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 14px;
  letter-spacing: 0.3px;
}

.badge-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.badge-row .element-badge {
  margin-bottom: 0;
}

.api-badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
  background: var(--bg-code);
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}

.prop-badge {
  margin-left: 8px;
  vertical-align: middle;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 8px;
  color: var(--text);
}

.page-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 16px;
  max-width: 600px;
}

.html-preview {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  display: inline-block;
}

.html-preview .tag-bracket { color: var(--text-muted); }
.html-preview .tag-name { color: var(--accent); }
.html-preview .attr-name { color: var(--accent-2); }
.html-preview .attr-val { color: #e6a817; }

/* ── Section ── */
.section {
  margin-bottom: 36px;
}

.section-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 12px;
  background: var(--accent);
  border-radius: 2px;
}

.api-copy {
  max-width: 660px;
  color: var(--text);
  font-size: 14px;
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
}

.learn-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-height: 76px;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.learn-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.learn-card span {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.learn-card small {
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.45;
}

/* ── Property table ── */
.prop-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.prop-table thead tr {
  border-bottom: 1px solid var(--border);
}

.prop-table th {
  text-align: left;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.prop-table tbody tr {
  border-bottom: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: background var(--transition);
}

.prop-table tbody tr:last-child { border-bottom: none; }

.prop-table tbody tr:hover { background: var(--bg-hover); }

.prop-table tbody tr.expanded { background: var(--bg-hover); }

.support-table tbody tr {
  cursor: default;
}

.prop-table td {
  padding: 10px 12px;
  vertical-align: top;
}

.prop-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.prop-type {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-2);
  white-space: nowrap;
}

.support-status {
  display: inline-block;
  min-width: 72px;
  font-size: 11px;
  font-weight: 700;
}

.support-yes {
  color: var(--tag-method);
}

.support-mixed {
  color: var(--accent-2);
}

.support-no {
  color: var(--text-code);
}

.prop-desc {
  color: var(--text);
  line-height: 1.5;
}

.prop-expand-row {
  display: none;
  background: var(--bg-code) !important;
  cursor: default;
}

.prop-expand-row.visible { display: table-row; }

.prop-expand-inner {
  padding: 12px 16px 16px;
  border-bottom: 1px solid var(--border);
}

.prop-expand-inner p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.expand-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-left: auto;
  opacity: 0.5;
}

/* ── Code block ── */
.code-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 4px;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-code);
}

.code-block-lang {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.copy-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-btn.copied {
  border-color: var(--tag-method);
  color: var(--tag-method);
}

.copy-btn.copy-error {
  border-color: var(--text-code);
  color: var(--text-code);
}

.code-block pre {
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--text);
}

/* ── Badges ── */
.badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  letter-spacing: 0.3px;
}

.badge-unique {
  background: rgba(67,97,238,0.12);
  color: var(--tag-unique);
}

.badge-inherited {
  background: var(--bg-code);
  color: var(--tag-inherited);
}

.badge-method {
  background: rgba(25,135,84,0.1);
  color: var(--tag-method);
}

/* ── Related cards ── */
.related-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.related-card {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

.related-card:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow-md);
}

.related-group {
  margin-bottom: 14px;
}

.related-group:last-child {
  margin-bottom: 0;
}

.related-label {
  margin-bottom: 7px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.mistake-list {
  padding-left: 18px;
  color: var(--text);
  font-size: 14px;
}

.mistake-list li + li {
  margin-top: 6px;
}

/* ── Index page ── */
.index-hero {
  padding: 60px 32px 40px;
  max-width: 860px;
}

.index-hero h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 0;
  margin-bottom: 12px;
}

.index-hero h1 span { color: var(--accent); }

.index-hero p {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 500px;
}

.element-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  padding: 0 32px 80px;
  max-width: 900px;
}

.element-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow);
  display: block;
}

.element-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.element-card-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 10px;
}

.element-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.element-card p {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Mobile ── */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 8px;
  cursor: pointer;
  color: var(--text);
  font-size: 16px;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

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

  .sidebar-overlay.open {
    display: block;
  }

  body.sidebar-open {
    overflow: hidden;
  }

  .main {
    margin-left: 0;
  }

  .menu-toggle { display: flex; }

  .content, .index-hero { padding: 24px 16px 60px; }

  .element-grid { padding: 0 16px 60px; grid-template-columns: 1fr; }

  .topbar { padding: 0 16px; }

  .html-preview {
    max-width: 100%;
    overflow-x: auto;
    white-space: nowrap;
  }

  .section {
    overflow-x: auto;
  }

  .prop-table {
    min-width: 600px;
  }
}

/* ── Highlight search ── */
.highlight {
  background: rgba(255, 200, 0, 0.25);
  border-radius: 2px;
}