/* ==========================================================================
   Flamegraph Viewer - CSS
   Python-branded profiler with dark/light theme support
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Theme System
   -------------------------------------------------------------------------- */

:root {
  /* Typography */
  --font-sans: "Source Sans Pro", "Lucida Grande", "Lucida Sans Unicode",
               "Geneva", "Verdana", sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Consolas', 'Liberation Mono', monospace;

  /* Python brand colors (theme-independent) */
  --python-blue: #3776ab;
  --python-blue-light: #4584bb;
  --python-blue-lighter: #5592cc;
  --python-gold: #ffd43b;
  --python-gold-dark: #ffcd02;
  --python-gold-light: #ffdc5c;

  /* Heat palette - defined per theme below */

  /* Layout */
  --sidebar-width: 280px;
  --sidebar-collapsed: 44px;
  --topbar-height: 52px;
  --statusbar-height: 32px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Light theme (default) - Python yellow-to-blue heat palette */
:root, [data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --border: #e9ecef;
  --border-subtle: #f0f2f5;

  --text-primary: #2e3338;
  --text-secondary: #5a6c7d;
  --text-muted: #8b949e;

  --accent: #3776ab;
  --accent-hover: #2d5aa0;
  --accent-glow: rgba(55, 118, 171, 0.15);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

  --header-gradient: linear-gradient(135deg, #3776ab 0%, #4584bb 100%);

  /* Light mode heat palette - blue to yellow to orange to red (cold to hot) */
  --heat-1: #d6e9f8;
  --heat-2: #a8d0ef;
  --heat-3: #7ba3d1;
  --heat-4: #ffe6a8;
  --heat-5: #ffd43b;
  --heat-6: #ffb84d;
  --heat-7: #ff9966;
  --heat-8: #ff6347;
}

/* Dark theme - teal-to-orange heat palette */
[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --border-subtle: #21262d;

  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;

  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-glow: rgba(88, 166, 255, 0.15);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

  --header-gradient: linear-gradient(135deg, #21262d 0%, #30363d 100%);

  /* Dark mode heat palette - dark blue to teal to yellow to orange (cold to hot) */
  --heat-1: #1e3a5f;
  --heat-2: #2d5580;
  --heat-3: #4a7ba7;
  --heat-4: #5a9fa8;
  --heat-5: #7ec488;
  --heat-6: #c4de6a;
  --heat-7: #f4d44d;
  --heat-8: #ff6b35;
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */

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

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background var(--transition-normal), color var(--transition-normal);
}

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

.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.main-content {
  display: flex;
  flex: 1;
  min-height: 0;
}

/* --------------------------------------------------------------------------
   Top Bar
   -------------------------------------------------------------------------- */

.top-bar {
  height: 56px;
  background: var(--header-gradient);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
  flex-shrink: 0;
  box-shadow: 0 2px 10px rgba(55, 118, 171, 0.25);
  border-bottom: 2px solid var(--python-gold);
}

/* Brand / Logo */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: white;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

/* Style the inlined SVG/img inside brand-logo */
.brand-logo svg,
.brand-logo img {
  width: 28px;
  height: 28px;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}

.brand-info {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.3px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.brand-subtitle {
  font-weight: 500;
  font-size: 10px;
  opacity: 0.9;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.brand-divider {
  width: 1px;
  height: 16px;
  background: rgba(255, 255, 255, 0.3);
}

/* Search */
.search-wrapper {
  flex: 1;
  max-width: 360px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 8px 36px 8px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: #2e3338;
  background: rgba(255, 255, 255, 0.95);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 20px;
  outline: none;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.search-input::placeholder {
  color: #6c757d;
}

.search-input:focus {
  border-color: rgba(255, 255, 255, 0.8);
  background: white;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* Dark theme search input */
[data-theme="dark"] .search-input {
  color: #e6edf3;
  background: rgba(33, 38, 45, 0.95);
  border: 2px solid rgba(88, 166, 255, 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .search-input::placeholder {
  color: #8b949e;
}

[data-theme="dark"] .search-input:focus {
  border-color: rgba(88, 166, 255, 0.6);
  background: rgba(33, 38, 45, 1);
  box-shadow: 0 4px 16px rgba(88, 166, 255, 0.2);
}

.search-input.has-matches {
  border-color: rgba(40, 167, 69, 0.8);
  box-shadow: 0 4px 16px rgba(40, 167, 69, 0.2);
}

.search-input.no-matches {
  border-color: rgba(220, 53, 69, 0.8);
  box-shadow: 0 4px 16px rgba(220, 53, 69, 0.2);
}

.search-clear {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  padding: 0;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  line-height: 1;
  color: #6c757d;
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.search-clear:hover {
  color: #2e3338;
}

[data-theme="dark"] .search-clear {
  color: #8b949e;
}

[data-theme="dark"] .search-clear:hover {
  color: #e6edf3;
}

.search-wrapper.has-value .search-clear {
  display: flex;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  font-size: 15px;
  color: white;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toolbar-btn:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.35);
}

.toolbar-btn:active {
  transform: scale(0.95);
}

/* --------------------------------------------------------------------------
   Sidebar
   -------------------------------------------------------------------------- */

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed) !important;
  transition: width var(--transition-normal);
}

.sidebar-toggle {
  position: absolute;
  top: 12px;
  right: 10px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
}

.sidebar-toggle svg {
  transition: transform var(--transition-fast);
}

.sidebar-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-glow);
}

.sidebar.collapsed .sidebar-toggle {
  right: 9px;
}

.sidebar.collapsed .sidebar-toggle svg {
  transform: rotate(180deg);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 44px 14px 14px;
}

.sidebar.collapsed .sidebar-content {
  display: none;
}

.sidebar-resize-handle {
  position: absolute;
  top: 0;
  right: 0;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  background: transparent;
  transition: background var(--transition-fast);
  z-index: 11;
}

.sidebar-resize-handle:hover,
.sidebar-resize-handle.resizing {
  background: var(--python-gold);
}

.sidebar-resize-handle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 40px;
  background: var(--border);
  border-radius: 1px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sidebar-resize-handle:hover::before {
  opacity: 1;
}

.sidebar.collapsed .sidebar-resize-handle {
  display: none;
}

body.resizing-sidebar {
  cursor: col-resize;
  user-select: none;
}

/* Sidebar Logo */
.sidebar-logo {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}

.sidebar-logo-img {
  width: 90px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-logo-img svg,
.sidebar-logo-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Sidebar sections */
.sidebar-section {
  margin-bottom: 20px;
}

.sidebar-section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent);
  margin: 0;
  flex: 1;
}

/* Collapsible sections */
.collapsible .section-header {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0 0 8px 0;
  margin-bottom: 10px;
  background: none;
  border: none;
  border-bottom: 2px solid var(--python-gold);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.collapsible .section-header:hover {
  opacity: 0.8;
}

.section-chevron {
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.collapsible.collapsed .section-chevron {
  transform: rotate(-90deg);
}

.section-content {
  overflow: hidden;
  transition: max-height var(--transition-normal), opacity var(--transition-normal);
  max-height: 1000px;
  opacity: 1;
}

.collapsible.collapsed .section-content {
  max-height: 0;
  opacity: 0;
  margin-bottom: -10px;
}

/* --------------------------------------------------------------------------
   Profile Summary Cards
   -------------------------------------------------------------------------- */

.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.summary-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all var(--transition-fast);
  animation: slideUp 0.4s ease-out backwards;
  animation-delay: calc(var(--i, 0) * 0.05s);
  overflow: hidden;
}

.summary-card:nth-child(1) { --i: 0; }
.summary-card:nth-child(2) { --i: 1; }
.summary-card:nth-child(3) { --i: 2; }
.summary-card:nth-child(4) { --i: 3; }

.summary-card:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.summary-icon {
  font-size: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: 6px;
  flex-shrink: 0;
}

.summary-data {
  min-width: 0;
  flex: 1;
  overflow: hidden;
}

.summary-value {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.summary-label {
  font-size: 8px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Efficiency Bar */
.efficiency-section {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.efficiency-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
}

.efficiency-label {
  font-size: 9px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.2px;
}

.efficiency-value {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
}

.efficiency-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.efficiency-fill {
  height: 100%;
  background: linear-gradient(90deg, #28a745 0%, #20c997 50%, #17a2b8 100%);
  border-radius: 3px;
  transition: width 0.6s ease-out;
  position: relative;
  overflow: hidden;
}

.efficiency-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 50%,
    transparent 100%
  );
  animation: shimmer 2s ease-in-out infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* --------------------------------------------------------------------------
   Thread Stats Grid (in Sidebar)
   -------------------------------------------------------------------------- */

.thread-stats-section {
  display: block;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stat-tile {
  background: var(--bg-primary);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  border: 2px solid var(--border);
  transition: all var(--transition-fast);
  animation: fadeIn 0.4s ease-out backwards;
  animation-delay: calc(var(--i, 0) * 0.05s);
}

.stat-tile:nth-child(1) { --i: 0; }
.stat-tile:nth-child(2) { --i: 1; }
.stat-tile:nth-child(3) { --i: 2; }
.stat-tile:nth-child(4) { --i: 3; }

.stat-tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.stat-tile-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-tile-label {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Stat tile color variants */
.stat-tile--green  { --tile-color: 40, 167, 69; --tile-text: #28a745; }
.stat-tile--red    { --tile-color: 220, 53, 69; --tile-text: #dc3545; }
.stat-tile--yellow { --tile-color: 255, 193, 7; --tile-text: #d39e00; }
.stat-tile--purple { --tile-color: 111, 66, 193; --tile-text: #6f42c1; }

.stat-tile[class*="--"] {
  border-color: rgba(var(--tile-color), 0.4);
  background: linear-gradient(135deg, rgba(var(--tile-color), 0.08) 0%, var(--bg-primary) 100%);
}
.stat-tile[class*="--"] .stat-tile-value { color: var(--tile-text); }

/* --------------------------------------------------------------------------
   Hotspot Cards
   -------------------------------------------------------------------------- */

.hotspot {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px;
  margin-bottom: 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
  opacity: 0;
  transform: translateY(8px);
  box-shadow: var(--shadow-sm);
}

.hotspot.visible {
  opacity: 1;
  transform: translateY(0);
}

.hotspot:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.hotspot.active {
  border-color: var(--python-gold);
  background: var(--accent-glow);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.hotspot:last-child {
  margin-bottom: 0;
}

.hotspot-rank {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--python-blue) 0%, var(--python-blue-light) 100%);
  color: white;
  box-shadow: 0 2px 4px rgba(55, 118, 171, 0.3);
}

.hotspot-rank--1 { background: linear-gradient(135deg, #d4af37, #f4d03f); color: #5a4a00; }
.hotspot-rank--2 { background: linear-gradient(135deg, #a8a8a8, #c0c0c0); color: #4a4a4a; }
.hotspot-rank--3 { background: linear-gradient(135deg, #cd7f32, #e6a55a); color: #5a3d00; }

.hotspot-info {
  flex: 1;
  min-width: 0;
}

.hotspot-func {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  word-break: break-word;
  margin-bottom: 2px;
}

.hotspot-file {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 3px;
  word-break: break-all;
}

.hotspot-stats {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
}

.hotspot-percent {
  color: var(--accent);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   Legend
   -------------------------------------------------------------------------- */

.legend-section {
  margin-top: auto;
  padding-top: 12px;
}

.legend {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  background: var(--bg-primary);
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  font-size: 11px;
}

.legend-color {
  width: 20px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.legend-label {
  color: var(--text-primary);
  font-weight: 500;
  flex: 1;
}

.legend-range {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Thread Filter
   -------------------------------------------------------------------------- */

.filter-section {
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.filter-label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.filter-select {
  width: 100%;
  padding: 7px 28px 7px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  border-radius: 6px;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233776ab' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 6px center;
  background-size: 14px;
  transition: all var(--transition-fast);
}

.filter-select:hover {
  border-color: var(--accent-hover);
  box-shadow: 0 2px 6px var(--accent-glow);
}

.filter-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* --------------------------------------------------------------------------
   Chart Area
   -------------------------------------------------------------------------- */

.chart-area {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  background: var(--bg-primary);
  position: relative;
}

#chart {
  width: 100%;
  height: 100%;
  padding: 16px;
  overflow: auto;
}

/* D3 Flamegraph overrides */
.d3-flame-graph rect {
  stroke: rgba(55, 118, 171, 0.3);
  stroke-width: 1px;
  cursor: pointer;
  transition: filter 0.1s ease;
}

.d3-flame-graph rect:hover {
  stroke: var(--python-blue);
  stroke-width: 2px;
  filter: brightness(1.08);
}

.d3-flame-graph text {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  fill: var(--text-primary);
  pointer-events: none;
}

/* Search highlight */
.d3-flame-graph rect.search-match {
  stroke: #ff6b35 !important;
  stroke-width: 2px !important;
  stroke-dasharray: 4 2;
}

.d3-flame-graph rect.search-dim {
  opacity: 0.25;
}

/* --------------------------------------------------------------------------
   Status Bar
   -------------------------------------------------------------------------- */

.status-bar {
  height: var(--statusbar-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.status-item::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--python-gold);
  border-radius: 50%;
}

.status-item:first-child::before {
  display: none;
}

.status-label {
  color: var(--text-muted);
}

.status-value {
  color: var(--text-primary);
  font-weight: 500;
}

.status-value.accent {
  color: var(--accent);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   Tooltip
   -------------------------------------------------------------------------- */

.python-tooltip {
  position: absolute;
  z-index: 1000;
  pointer-events: none;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-primary);
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.5;
}

.tooltip-header {
  margin-bottom: 10px;
}

.tooltip-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.3;
  word-break: break-word;
  margin-bottom: 4px;
}

.tooltip-location {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 4px 8px;
  border-radius: 4px;
  word-break: break-all;
}

.tooltip-stats {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  font-size: 12px;
}

.tooltip-stat-label {
  color: var(--text-secondary);
  font-weight: 500;
}

.tooltip-stat-value {
  color: var(--text-primary);
  font-weight: 600;
}

.tooltip-stat-value.accent {
  color: var(--accent);
}

.tooltip-source {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.tooltip-source-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}

.tooltip-source-code {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.5;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  max-height: 140px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.tooltip-source-line {
  color: var(--text-secondary);
  padding: 1px 0;
}

.tooltip-source-line.current {
  color: var(--accent);
  font-weight: 600;
}

.tooltip-hint {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   Focus States (Accessibility)
   -------------------------------------------------------------------------- */

button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--python-gold);
  outline-offset: 2px;
}

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

@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: var(--topbar-height);
    bottom: var(--statusbar-height);
    z-index: 100;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.collapsed {
    width: var(--sidebar-collapsed);
  }

  .brand-subtitle {
    display: none;
  }

  .search-wrapper {
    max-width: 220px;
  }
}

@media (max-width: 600px) {
  .toolbar-btn:not(.theme-toggle) {
    display: none;
  }

  .search-wrapper {
    max-width: 160px;
  }

  .brand-info {
    display: none;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}