/* ===== RESET & TOKENS ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-gradient: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 100%);
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: blur(12px);
  --text-primary: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.55);
  --text-muted: rgba(255, 255, 255, 0.35);
  --accent-glow: rgba(99, 102, 241, 0.15);
  --divider: rgba(255, 255, 255, 0.06);
  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;
  --slider-track: rgba(255, 255, 255, 0.1);
  --slider-thumb: #818cf8;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --max-width: 1400px;
  --transition: all 0.25s ease;
  --font-xs: 0.75rem;
  --font-sm: 0.8125rem;
  --font-base: 0.9375rem;
  --font-lg: 1.125rem;
  --font-xl: 1.5rem;
  --font-2xl: 2rem;
  --theme-transition: background 0.3s ease, background-image 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
  /* Skeleton tokens */
  --skeleton-bg: rgba(255, 255, 255, 0.04);
  --skeleton-pulse-bg: rgba(255, 255, 255, 0.09);
  /* Sticky Table columns */
  --table-sticky-bg: #161622;
  --table-sticky-hover-bg: #202030;
}

:root[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(15, 23, 42, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-glow: rgba(99, 102, 241, 0.08);
  --divider: rgba(15, 23, 42, 0.06);
  --success: #10b981;
  --warning: #d97706;
  --danger: #ef4444;
  --slider-track: rgba(15, 23, 42, 0.1);
  --slider-thumb: #6366f1;
  --skeleton-bg: rgba(15, 23, 42, 0.04);
  --skeleton-pulse-bg: rgba(15, 23, 42, 0.09);
  --table-sticky-bg: #f8fafc;
  --table-sticky-hover-bg: #f1f5f9;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: var(--font-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: var(--theme-transition);
}

/* ===== GLASS MIXIN ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: var(--theme-transition);
}

/* ===== APP SHELL ===== */
.app {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  padding-top: var(--spacing-xl);
  position: relative;
}

/* ===== APP HEADER CONTROLS ===== */
.app-header-controls {
  position: absolute;
  top: 24px;
  right: var(--spacing-lg);
  z-index: 110;
}

.theme-toggle-btn {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  outline: none;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}
.theme-toggle-btn:hover {
  transform: scale(1.08);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}
:root[data-theme="light"] .theme-toggle-btn:hover {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.15);
}
.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-primary);
  transition: transform 0.5s ease;
}
.theme-toggle-btn:hover svg {
  transform: rotate(20deg);
}

:root .theme-toggle-btn .sun-icon { display: block; }
:root .theme-toggle-btn .moon-icon { display: none; }
:root[data-theme="light"] .theme-toggle-btn .sun-icon { display: none; }
:root[data-theme="light"] .theme-toggle-btn .moon-icon { display: block; }

/* ===== HEADER ===== */
.header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}
.header h1 {
  font-size: var(--font-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-xs);
  background: linear-gradient(135deg, #e0e7ff, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
:root[data-theme="light"] .header h1 {
  background: linear-gradient(135deg, #312e81, #4f46e5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header .subtitle {
  color: var(--text-secondary);
  font-size: var(--font-base);
  font-weight: 400;
}

/* ===== CONTROLS BAR ===== */
.controls-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md) var(--spacing-lg);
  align-items: start;
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
:root[data-theme="light"] .controls-bar {
  background: rgba(248, 250, 252, 0.88);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  min-width: 0;
}
.control-group.full-width {
  grid-column: 1 / -1;
}
.control-group label {
  font-size: var(--font-xs);
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.control-input-wrap {
  height: 34px;
  display: flex;
  align-items: center;
}
.control-input-wrap input[type="range"] {
  width: 100%;
}
.control-hint {
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Range slider styling */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--slider-track);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: 2px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: transform 0.15s ease;
}
:root[data-theme="light"] input[type="range"]::-webkit-slider-thumb {
  border-color: rgba(15, 23, 42, 0.15);
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: 2px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
}
:root[data-theme="light"] input[type="range"]::-moz-range-thumb {
  border-color: rgba(15, 23, 42, 0.15);
}

/* Search input */
.search-input {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 6px 12px;
  font-size: var(--font-sm);
  font-family: inherit;
  outline: none;
  width: 100%;
  height: 34px;
  transition: var(--transition);
}
:root[data-theme="light"] .search-input {
  background: rgba(15, 23, 42, 0.04);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: rgba(129, 140, 248, 0.4);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Dual slider container */
.dual-slider {
  position: relative;
  height: 34px;
  display: flex;
  align-items: center;
  width: 100%;
}
.dual-slider-track {
  position: absolute;
  width: 100%;
  height: 4px;
  background: var(--slider-track);
  border-radius: 2px;
  pointer-events: none;
  z-index: 1;
}
.dual-slider-range {
  position: absolute;
  height: 4px;
  background: var(--slider-thumb);
  border-radius: 2px;
  pointer-events: none;
  z-index: 2;
}
.dual-slider input[type="range"] {
  position: absolute;
  width: 100%;
  pointer-events: none;
  background: transparent;
  outline: none;
  margin: 0;
}
.dual-slider input[type="range"]::-webkit-slider-thumb {
  pointer-events: auto;
  position: relative;
  z-index: 11;
}
.dual-slider input[type="range"]::-moz-range-thumb {
  pointer-events: auto;
  position: relative;
  z-index: 11;
}

/* Provider pills */
.provider-filters { min-width: 100%; }
.pill-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.provider-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: var(--font-xs);
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-muted);
  opacity: 0.5;
  transition: var(--transition);
  user-select: none;
}
.provider-pill.active { opacity: 1; }
.provider-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.action-link { transition: var(--transition); }
.action-link:hover {
  color: var(--text-primary) !important;
  opacity: 0.9;
}
.reset-btn {
  background: rgba(129, 140, 248, 0.15);
  border: 1px solid rgba(129, 140, 248, 0.3);
  color: var(--slider-thumb);
  font-family: inherit;
  font-size: var(--font-sm);
  font-weight: 500;
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-top: 8px;
  display: inline-block;
  transition: var(--transition);
}
.reset-btn:hover {
  background: rgba(129, 140, 248, 0.25);
  border-color: rgba(129, 140, 248, 0.5);
  transform: translateY(-1px);
}

/* ===== TAB NAVIGATION ===== */
.tab-nav {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--divider);
  padding-bottom: var(--spacing-sm);
}
.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: var(--font-base);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}
.tab-btn:hover { color: var(--text-primary); background: rgba(255, 255, 255, 0.03); }
:root[data-theme="light"] .tab-btn:hover { background: rgba(0, 0, 0, 0.03); }
.tab-btn.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}
:root[data-theme="light"] .tab-btn.active { background: rgba(0, 0, 0, 0.05); }
.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--slider-thumb);
  border-radius: 2px 2px 0 0;
}

/* ===== TAB CONTENT ===== */
.tab-content { display: none; }
.tab-content.active {
  display: block;
  animation: fadeIn 0.25s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

/* ===== SUMMARY CARDS ===== */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}
.summary-card {
  padding: var(--spacing-lg);
  transition: transform 0.2s ease;
}
.summary-card:hover { transform: translateY(-2px); }
.card-icon { font-size: 1.5rem; margin-bottom: var(--spacing-sm); }
.card-label {
  font-size: var(--font-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--spacing-xs);
}
.card-model {
  font-size: var(--font-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card-stat {
  font-size: var(--font-xl);
  font-weight: 700;
}
.card-stat.green { color: var(--success); }
.card-stat.amber { color: var(--warning); }
.card-stat.blue { color: #60a5fa; }
.card-stat.red { color: var(--danger); }

/* ===== LEADERBOARD ===== */
.overview-leaderboard {
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}
.overview-leaderboard h2 {
  font-size: var(--font-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}
.leaderboard-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 0;
  border-bottom: 1px solid var(--divider);
}
.leaderboard-row:last-child { border-bottom: none; }
.leaderboard-rank {
  font-size: var(--font-sm);
  font-weight: 700;
  color: var(--text-muted);
  width: 28px;
  flex-shrink: 0;
  text-align: right;
}
.leaderboard-rank.top { color: var(--warning); }
.leaderboard-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.leaderboard-name {
  font-size: var(--font-sm);
  font-weight: 500;
  min-width: 200px;
  flex-shrink: 0;
}
.leaderboard-provider {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-left: 2px;
}
.leaderboard-bar-track {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  overflow: hidden;
  min-width: 60px;
}
:root[data-theme="light"] .leaderboard-bar-track { background: rgba(15, 23, 42, 0.06); }
.leaderboard-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}
.leaderboard-score {
  font-size: var(--font-sm);
  font-weight: 600;
  width: 50px;
  flex-shrink: 0;
  text-align: right;
  color: var(--text-secondary);
}
.leaderboard-expand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: var(--spacing-md);
  padding: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: var(--font-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}
:root[data-theme="light"] .leaderboard-expand { background: rgba(0, 0, 0, 0.02); }
.leaderboard-expand:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}
:root[data-theme="light"] .leaderboard-expand:hover { background: rgba(0, 0, 0, 0.04); }
.leaderboard-expand .arrow {
  font-size: 0.65rem;
  transition: transform 0.2s ease;
}
.leaderboard-expand.expanded .arrow { transform: rotate(180deg); }

/* ===== FORMULA CARD ===== */
.formula-card {
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}
.formula-card h2 {
  font-size: var(--font-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}
.formula-item { margin-bottom: var(--spacing-md); }
.formula-item:last-child { margin-bottom: 0; }
.formula-label {
  font-size: var(--font-sm);
  font-weight: 600;
  color: var(--slider-thumb);
  margin-bottom: 2px;
}
.formula-item code {
  display: block;
  background: rgba(255, 255, 255, 0.04);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-sm);
  color: var(--text-primary);
  margin-bottom: 4px;
  font-family: 'SF Mono', 'Fira Code', monospace;
}
:root[data-theme="light"] .formula-item code { background: rgba(15, 23, 42, 0.04); }
.formula-desc {
  font-size: var(--font-xs);
  color: var(--text-muted);
}

/* ===== CHARTS ===== */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}
.charts-grid.stacked { grid-template-columns: 1fr; }
.chart-container { padding: var(--spacing-lg); }
.chart-container h2 {
  font-size: var(--font-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}
.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}
.chart-header h2 { margin-bottom: 0; }
#scatterContainer {
  grid-column: span 2;
}
.chart-canvas-wrap-scatter {
  position: relative;
  height: 340px;
}
.chart-canvas-wrap {
  position: relative;
  height: 480px;
}
.radar-legend-hint {
  font-size: var(--font-xs);
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--spacing-sm);
  font-style: italic;
}
.metric-select {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-sm);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
}
:root[data-theme="light"] .metric-select { background: rgba(15, 23, 42, 0.04); }
.metric-select option { background: #1a1a2e; }
:root[data-theme="light"] .metric-select option { background: #ffffff; }

/* ===== TABLE ===== */
.table-wrapper {
  padding: var(--spacing-md);
  overflow-x: auto;
}
#modelTable {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  white-space: nowrap;
}
#modelTable th {
  padding: 12px 16px;
  text-align: left;
  font-size: var(--font-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  user-select: none;
  transition: color 0.15s ease;
  position: relative;
  border-bottom: 1px solid var(--divider);
}
#modelTable th:hover { color: var(--text-primary); }
#modelTable th.num { text-align: right; }
#modelTable th.sort-asc::after,
#modelTable th.sort-desc::after {
  margin-left: 4px;
  font-size: 0.65rem;
  color: var(--slider-thumb);
}
#modelTable th.sort-asc::after { content: ' ▲'; }
#modelTable th.sort-desc::after { content: ' ▼'; }
#modelTable td {
  padding: 10px 16px;
  font-size: var(--font-sm);
  border-bottom: 1px solid var(--divider);
  color: var(--text-primary);
}
#modelTable td.num { text-align: right; font-variant-numeric: tabular-nums; }
#modelTable tbody tr { transition: background 0.15s ease; }
#modelTable tbody tr:hover { background: rgba(255, 255, 255, 0.03); }
:root[data-theme="light"] #modelTable tbody tr:hover { background: rgba(0, 0, 0, 0.02); }

.provider-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

/* ===== STICKY TABLE COLUMNS ===== */
#modelTable th:first-child,
#modelTable td:first-child {
  position: sticky;
  left: 0;
  background: var(--table-sticky-bg);
  z-index: 5;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.08);
  min-width: 110px;
  width: 110px;
}
#modelTable th:nth-child(2),
#modelTable td:nth-child(2) {
  position: sticky;
  left: 110px;
  background: var(--table-sticky-bg);
  z-index: 5;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.08);
  min-width: 150px;
  width: 150px;
}
#modelTable th:first-child,
#modelTable th:nth-child(2) {
  z-index: 6;
}
#modelTable thead th:first-child {
  border-top-left-radius: var(--radius-sm);
}
#modelTable tbody tr:last-child td:first-child {
  border-bottom-left-radius: var(--radius-sm);
}

#modelTable tbody tr:hover td:first-child,
#modelTable tbody tr:hover td:nth-child(2) {
  background: var(--table-sticky-hover-bg) !important;
}

/* ===== BIDIRECTIONAL HIGHLIGHTING ===== */
#modelTable tbody tr.highlighted td {
  background: rgba(129, 140, 248, 0.12) !important;
}
#modelTable tbody tr.highlighted td:first-child {
  border-left: 3px solid var(--slider-thumb) !important;
  background: linear-gradient(rgba(129, 140, 248, 0.12), rgba(129, 140, 248, 0.12)), var(--table-sticky-bg) !important;
  box-shadow: 2px 0 5px rgba(129, 140, 248, 0.1);
}
#modelTable tbody tr.highlighted td:nth-child(2) {
  background: linear-gradient(rgba(129, 140, 248, 0.12), rgba(129, 140, 248, 0.12)), var(--table-sticky-bg) !important;
  box-shadow: 2px 0 5px rgba(129, 140, 248, 0.1);
}

.leaderboard-row.highlighted {
  background: rgba(129, 140, 248, 0.12) !important;
  border-radius: var(--radius-sm);
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
  border-left: 3px solid var(--slider-thumb);
  transition: var(--transition);
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  color: var(--text-muted);
  font-size: var(--font-base);
}

/* ===== SKELETON / SHIMMER LOADING ===== */
@keyframes pulse {
  0% { background-color: var(--skeleton-bg); }
  50% { background-color: var(--skeleton-pulse-bg); }
  100% { background-color: var(--skeleton-bg); }
}

.pulse { animation: pulse 1.5s infinite ease-in-out; }

.skeleton-element {
  background-color: var(--skeleton-bg);
  border-radius: var(--radius-sm);
  color: transparent !important;
  pointer-events: none;
  user-select: none;
  border-color: transparent !important;
}
.skeleton-element * { opacity: 0 !important; }

.leaderboard-row.skeleton-row { pointer-events: none; }
.leaderboard-row.skeleton-row .leaderboard-dot {
  background-color: var(--skeleton-bg) !important;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .charts-grid { grid-template-columns: 1fr; }
  #scatterContainer { grid-column: span 1; }
}
@media (max-width: 640px) {
  .app { padding: var(--spacing-md); padding-top: var(--spacing-lg); }
  .header h1 { font-size: 1.5rem; }
  .controls-bar { padding: var(--spacing-sm) var(--spacing-md); grid-template-columns: 1fr; }
  .summary-cards { grid-template-columns: 1fr 1fr; gap: var(--spacing-md); }
  .summary-card { padding: var(--spacing-md); }
  .card-stat { font-size: var(--font-lg); }
  .leaderboard-name { min-width: 120px; }
}
@media (max-width: 480px) {
  .app-header-controls {
    top: 16px;
    right: 16px;
  }
  .summary-cards { grid-template-columns: 1fr !important; }
  .tab-nav {
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--spacing-xs);
  }
  .tab-btn {
    padding: var(--spacing-sm) var(--spacing-sm);
    font-size: var(--font-sm);
  }
  .dual-slider input[type="range"]::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
  }
  .dual-slider input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  .pulse { animation: none; }
  .tab-content.active { animation: none; }
  .leaderboard-bar-fill { transition: none; }
  .theme-toggle-btn svg { transition: none; }
  body { transition: none; }
  .glass { transition: none; }
}

/* ===== CHATBOT STYLES ===== */
.hide {
  display: none !important;
}

/* FAB Button */
.chat-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 120;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}
.chat-fab:hover {
  transform: scale(1.08) translateY(-2px);
  box-shadow: 0 12px 40px var(--accent-glow);
  border-color: rgba(129, 140, 248, 0.4);
}
.chat-fab svg {
  width: 24px;
  height: 24px;
  stroke: var(--slider-thumb);
  transition: transform 0.3s ease;
}
.chat-fab:hover svg {
  transform: rotate(5deg) scale(1.05);
}
.chat-fab-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--slider-thumb);
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(129, 140, 248, 0.5);
}
.pulse-badge {
  animation: badge-pulse 2s infinite;
}
@keyframes badge-pulse {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(129, 140, 248, 0.7); }
  70% { transform: scale(1.05); box-shadow: 0 0 0 6px rgba(129, 140, 248, 0); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(129, 140, 248, 0); }
}

/* Chat Drawer container */
.chat-drawer {
  position: fixed;
  bottom: 96px;
  right: 24px;
  width: 440px;
  height: 560px;
  z-index: 130;
  display: flex;
  flex-direction: column;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  overflow: hidden;
  opacity: 1;
  transform: translateY(0);
  min-width: 360px;
  min-height: 400px;
  max-width: 95vw;
  max-height: 85vh;
}
.chat-drawer.hide {
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  pointer-events: none;
  display: flex !important; /* overrides display:none in .hide so transition works, but pointer events is disabled */
}

/* Custom resizer handles */
.chat-resizer {
  position: absolute;
  z-index: 150;
  background: transparent;
}
.chat-resizer-t {
  top: 0;
  left: 0;
  width: 100%;
  height: 10px;
  cursor: ns-resize;
}
.chat-resizer-l {
  top: 0;
  left: 0;
  width: 10px;
  height: 100%;
  cursor: ew-resize;
}
.chat-resizer-tl {
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  cursor: nwse-resize;
  z-index: 151;
}
.chat-drawer.resizing {
  transition: none !important;
}

/* Chat Header */
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--divider);
  background: rgba(15, 15, 26, 0.4);
  backdrop-filter: blur(10px);
}
:root[data-theme="light"] .chat-header {
  background: rgba(255, 255, 255, 0.4);
}
.chat-header-title {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat-header-title h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.chat-status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
}
.chat-status-indicator.loading {
  background: var(--warning);
  animation: pulse-dot 1.2s infinite;
}
@keyframes pulse-dot {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}
.chat-header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat-model-select {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  height: 34px;
  margin-top: 4px;
}
:root[data-theme="light"] .chat-model-select {
  background: rgba(0, 0, 0, 0.04);
}
.chat-model-select:focus {
  border-color: rgba(129, 140, 248, 0.5);
}
.chat-icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.chat-icon-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}
:root[data-theme="light"] .chat-icon-btn:hover {
  background: rgba(0, 0, 0, 0.05);
}
.chat-icon-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
}

/* API Key View */
.chat-api-key-view {
  position: absolute;
  top: 53px; /* right below header */
  left: 0;
  right: 0;
  bottom: 0;
  background: #0f0f1a;
  z-index: 135;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
:root[data-theme="light"] .chat-api-key-view {
  background: #ffffff;
}
.api-key-container {
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.api-key-container h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.api-key-container p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}
.chat-key-input {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  color: #fff;
  padding: 8px 12px;
  font-size: 13px;
  font-family: monospace;
  border-radius: var(--radius-sm);
  outline: none;
  width: 100%;
}
:root[data-theme="light"] .chat-key-input {
  background: rgba(0, 0, 0, 0.04);
  color: #0f172a;
}
.chat-key-input:focus {
  border-color: var(--slider-thumb);
}
.api-key-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
.chat-btn {
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  flex: 1;
}
.primary-btn {
  background: var(--slider-thumb);
  color: #fff;
}
.primary-btn:hover {
  background: #6366f1;
  transform: translateY(-1px);
}
.secondary-btn {
  background: rgba(248, 113, 113, 0.15);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--danger);
}
.secondary-btn:hover {
  background: rgba(248, 113, 113, 0.25);
  transform: translateY(-1px);
}
.api-key-hint {
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 4px;
}
.api-key-hint a {
  color: var(--slider-thumb);
  text-decoration: none;
}
.api-key-hint a:hover {
  text-decoration: underline;
}

/* Chat Logs */
.chat-logs {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 0;
  background: rgba(15, 15, 26, 0.2);
}
:root[data-theme="light"] .chat-logs {
  background: rgba(255, 255, 255, 0.15);
}
.chat-sender-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--slider-thumb);
  margin-bottom: 4px;
  display: block;
}
.chat-message.user .chat-sender-label {
  color: var(--text-secondary);
}
.chat-message {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 100%;
  padding: 8px 0;
  border-bottom: 1px solid var(--divider);
}
.chat-message:last-child {
  border-bottom: none;
}
.message-bubble {
  font-size: 13.5px;
  line-height: 1.5;
  word-break: break-word;
  color: var(--text-primary);
}
.chat-message.user .message-bubble {
  color: var(--text-primary);
}
.chat-message.assistant .message-bubble {
  color: var(--text-primary);
}
/* Assistant message is transparent, matching user messages */
.chat-message.system .message-bubble {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.2);
  color: var(--danger);
  font-size: 12px;
  border-radius: 6px;
  width: 100%;
}
.chat-message.system {
  max-width: 100%;
  align-self: center;
}

/* Collapsible Reasoning Block inside Assistant Bubble */
.thinking-block {
  margin-bottom: 10px;
  font-size: 12px;
  border-left: 2px solid rgba(129, 140, 248, 0.3);
  padding-left: 10px;
  background: rgba(129, 140, 248, 0.03);
  border-radius: 4px;
  width: 100%;
}
.thinking-title::-webkit-details-marker {
  display: none;
}
.thinking-title {
  font-weight: 600;
  color: var(--slider-thumb);
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 0;
  list-style: none;
}
.thinking-title::before {
  content: '▶';
  font-size: 9px;
  display: inline-block;
  transition: transform 0.2s ease;
}
details[open] .thinking-title::before {
  transform: rotate(90deg);
}
.thinking-content {
  color: var(--text-secondary);
  font-style: italic;
  white-space: pre-wrap;
  padding: 4px 0 8px 0;
  line-height: 1.4;
}

/* Chat Markdown Formatting */
.message-bubble code {
  font-family: monospace;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 4px;
  border-radius: 3px;
  font-size: 12px;
}
:root[data-theme="light"] .message-bubble code {
  background: rgba(0, 0, 0, 0.06);
}
.message-bubble pre {
  background: rgba(0, 0, 0, 0.2) !important;
  border: 1px solid var(--glass-border);
  padding: 10px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 6px 0;
}
:root[data-theme="light"] .message-bubble pre {
  background: #0f172a !important;
  color: #f8fafc;
}
.message-bubble pre code {
  background: transparent;
  padding: 0;
  font-size: 11px;
  color: inherit;
}
.message-bubble h1,
.message-bubble h2,
.message-bubble h3,
.message-bubble p,
.message-bubble ul,
.message-bubble ol,
.message-bubble pre,
.message-bubble table {
  margin-top: 0;
}

.message-bubble h1 {
  font-size: 16px;
  margin-bottom: 10px;
  font-weight: 700;
  color: var(--text-primary);
}
.message-bubble h2 {
  font-size: 14.5px;
  margin-bottom: 8px;
  font-weight: 650;
  color: var(--text-primary);
}
.message-bubble h3 {
  font-size: 13.5px;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text-primary);
}

.message-bubble p {
  margin-bottom: 6px;
}
.message-bubble p:last-child {
  margin-bottom: 0;
}
.message-bubble ul, .message-bubble ol {
  margin-left: 16px;
  margin-bottom: 6px;
}
.message-bubble hr {
  border: none;
  border-top: 1px solid var(--divider);
  margin: 12px 0;
}

/* Chat Markdown Table styling */
.message-bubble table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
:root[data-theme="light"] .message-bubble table {
  background: rgba(0, 0, 0, 0.01);
}
.message-bubble th, .message-bubble td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--divider);
}
.message-bubble th {
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}
:root[data-theme="light"] .message-bubble th {
  background: rgba(0, 0, 0, 0.03);
}
.message-bubble tr:last-child td {
  border-bottom: none;
}

/* Chat Footer Input */
.chat-footer {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--divider);
  background: rgba(15, 15, 26, 0.4);
}
:root[data-theme="light"] .chat-footer {
  background: rgba(255, 255, 255, 0.4);
}
.chat-input {
  flex: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 13px;
  outline: none;
  resize: none;
  max-height: 80px;
  line-height: 1.4;
  font-family: inherit;
  transition: var(--transition);
}
:root[data-theme="light"] .chat-input {
  background: rgba(0, 0, 0, 0.04);
}
.chat-input:focus {
  border-color: rgba(129, 140, 248, 0.4);
  box-shadow: 0 0 0 2px var(--accent-glow);
}
.chat-send-btn {
  background: var(--slider-thumb);
  border: none;
  color: #fff;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}
.chat-send-btn:hover {
  background: #6366f1;
  transform: scale(1.03);
}
.chat-send-btn:disabled {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
}
.chat-send-btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
}

/* Chat Settings Group styling */
.settings-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}
.settings-group + .settings-group {
  margin-top: 12px;
}
.settings-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

/* Tool status message styling */
.chat-message.tool-status {
  align-self: center;
  max-width: 100%;
}
.chat-message.tool-status .message-bubble {
  background: rgba(129, 140, 248, 0.08);
  border: 1px dashed rgba(129, 140, 248, 0.3);
  color: var(--slider-thumb);
  font-size: 11px;
  font-family: monospace;
  padding: 6px 12px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
  animation: tool-pulse 1.5s infinite;
}
@keyframes tool-pulse {
  0% { opacity: 0.7; }
  50% { opacity: 1; }
  100% { opacity: 0.7; }
}

/* Mobile responsive Chat Widget */
@media (max-width: 480px) {
  .chat-drawer {
    bottom: 0 !important;
    right: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    border-radius: 0 !important;
    border: none !important;
  }
  .chat-drawer.hide {
    transform: translateY(100%);
    opacity: 0;
  }
  .chat-fab {
    bottom: 16px;
    right: 16px;
  }
  .chat-resizer {
    display: none !important;
  }
}

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--divider);
  color: var(--text-secondary);
  font-size: var(--font-sm);
}

.footer a {
  color: var(--slider-thumb);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition);
}

.footer a:hover {
  text-decoration: underline;
  filter: brightness(1.2);
}