/* ============================================================
   ELEVATOR SIMULATOR — DESIGN SYSTEM
   Dark mode glassmorphism theme with Inter typeface.
   ============================================================ */

/* === CSS Custom Properties (Design Tokens) === */
:root {
  /* Color Palette — Dark Mode */
  --bg-primary: hsl(225, 25%, 8%);
  --bg-secondary: hsl(225, 20%, 12%);
  --bg-tertiary: hsl(225, 18%, 16%);
  --bg-glass: hsl(225, 22%, 13%);
  --bg-glass-hover: hsl(225, 22%, 15%);

  --text-primary: hsl(0, 0%, 95%);
  --text-secondary: hsl(220, 10%, 65%);
  --text-muted: hsl(220, 10%, 45%);

  --accent-blue: hsl(215, 90%, 60%);
  --accent-cyan: hsl(185, 80%, 55%);
  --accent-purple: hsl(265, 75%, 65%);
  --accent-green: hsl(155, 70%, 50%);
  --accent-amber: hsl(40, 90%, 60%);
  --accent-red: hsl(0, 75%, 60%);
  --accent-pink: hsl(330, 80%, 65%);

  --elevator-idle: var(--accent-cyan);
  --elevator-moving: var(--accent-blue);
  --elevator-door-open: var(--accent-green);

  --passenger-waiting: var(--accent-amber);
  --passenger-riding: var(--accent-purple);
  --passenger-arrived: var(--accent-green);
  --passenger-long-wait: var(--accent-red);

  /* Glassmorphism */
  --glass-blur: 16px;
  --glass-border: 1px solid hsla(0, 0%, 100%, 0.08);
  --glass-border-hover: 1px solid hsla(0, 0%, 100%, 0.15);
  --glass-shadow: 0 2px 10px hsla(0, 0%, 0%, 0.22);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.7rem;
  --font-size-sm: 0.8rem;
  --font-size-md: 0.9rem;
  --font-size-lg: 1.1rem;
  --font-size-xl: 1.35rem;
  --font-size-2xl: 1.8rem;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.85rem;
  --space-lg: 1.25rem;
  --space-xl: 1.75rem;
  --space-2xl: 2.5rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-left-width: clamp(380px, 22vw, 480px);
  --sidebar-right-width: clamp(300px, 17vw, 360px);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  overflow: hidden;
  height: 100vh;
  /* Subtle animated gradient background */
  background: linear-gradient(135deg, var(--bg-primary) 0%, hsl(230, 20%, 10%) 50%, hsl(220, 25%, 8%) 100%);
}

/* === App Layout — 3-Column Grid === */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-left-width) 1fr var(--sidebar-right-width);
  gap: var(--space-md);
  height: 100vh;
  padding: var(--space-md);
}

/* === Panel Base (Glassmorphism) === */
.panel {
  background: var(--bg-glass);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  overflow-y: auto;
  overflow-x: hidden;
  transition: border var(--transition-normal);
}

.panel:hover {
  border: var(--glass-border-hover);
}

/* Scrollbar Styling */
.panel::-webkit-scrollbar {
  width: 5px;
}

.panel::-webkit-scrollbar-track {
  background: transparent;
}

.panel::-webkit-scrollbar-thumb {
  background: hsla(0, 0%, 100%, 0.1);
  border-radius: 10px;
}

.panel::-webkit-scrollbar-thumb:hover {
  background: hsla(0, 0%, 100%, 0.2);
}

/* === Left Panel (Config) === */
.panel-left {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.panel-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.section-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.config-section {
  padding: var(--space-md);
  background: hsla(225, 20%, 12%, 0.5);
  border-radius: var(--radius-md);
  border: 1px solid hsla(0, 0%, 100%, 0.04);
  margin-bottom: var(--space-xs);
}

/* === Control Group === */
.control-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.control-group label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  flex: 0 0 auto;
  min-width: 96px;
}

.control-group .slider {
  flex: 1;
}

.slider-value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--accent-cyan);
  min-width: 42px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* === Range Input (Slider) === */
.slider {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--bg-tertiary);
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 6px hsla(185, 80%, 55%, 0.4);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 12px hsla(185, 80%, 55%, 0.6);
  transform: scale(1.15);
}

.slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 6px hsla(185, 80%, 55%, 0.4);
}

/* === Select Dropdown === */
.select {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid hsla(0, 0%, 100%, 0.08);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
  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='%23999' 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 8px center;
  background-size: 14px;
  padding-right: 30px;
}

.control-group .select {
  flex: 1;
  width: auto;
  min-width: 0;
}

.select:focus {
  border-color: var(--accent-cyan);
}

.select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* === Buttons === */
.btn {
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: hsla(0, 0%, 100%, 0);
  transition: background var(--transition-fast);
}

.btn:hover::after {
  background: hsla(0, 0%, 100%, 0.08);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  box-shadow: 0 2px 12px hsla(215, 90%, 60%, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 20px hsla(215, 90%, 60%, 0.5);
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-green), hsl(165, 70%, 45%));
  color: white;
  box-shadow: 0 2px 12px hsla(155, 70%, 50%, 0.3);
}

.btn-success:hover {
  box-shadow: 0 4px 20px hsla(155, 70%, 50%, 0.5);
}

.btn-warning {
  background: linear-gradient(135deg, var(--accent-amber), hsl(30, 85%, 55%));
  color: hsl(225, 25%, 8%);
  box-shadow: 0 2px 12px hsla(40, 90%, 60%, 0.3);
}

.btn-warning:hover {
  box-shadow: 0 4px 20px hsla(40, 90%, 60%, 0.5);
}

.btn-danger {
  background: linear-gradient(135deg, var(--accent-red), hsl(350, 70%, 55%));
  color: white;
  box-shadow: 0 2px 12px hsla(0, 75%, 60%, 0.3);
}

.btn-danger:hover {
  box-shadow: 0 4px 20px hsla(0, 75%, 60%, 0.5);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid hsla(0, 0%, 100%, 0.08);
}

.btn-secondary:hover {
  border-color: hsla(0, 0%, 100%, 0.2);
}

.btn-full {
  width: 100%;
}

.btn-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
}

.btn-icon {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid hsla(0, 0%, 100%, 0.1);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  font-family: var(--font-family);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-icon:hover {
  background: var(--bg-glass-hover);
  border-color: hsla(185, 80%, 55%, 0.35);
}

.control-group-strategy .select {
  flex: 1;
}

.strategy-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.strategy-link {
  padding: 2px var(--space-sm);
  border: 1px solid hsla(0, 0%, 100%, 0.08);
  border-radius: var(--radius-sm);
  background: hsla(225, 20%, 14%, 0.6);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  font-family: var(--font-family);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.strategy-link:hover {
  color: var(--accent-cyan);
  border-color: hsla(185, 80%, 55%, 0.35);
  background: hsla(185, 80%, 55%, 0.08);
}

.strategy-link-active {
  color: var(--accent-cyan);
  border-color: hsla(185, 80%, 55%, 0.45);
  background: hsla(185, 80%, 55%, 0.12);
}

/* === Modal === */
body.modal-open {
  overflow: hidden;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: hsla(225, 25%, 4%, 0.72);
  backdrop-filter: blur(4px);
}

.modal-dialog {
  position: relative;
  width: min(560px, 100%);
  max-height: min(88vh, 720px);
  overflow-y: auto;
  padding: var(--space-lg);
  background: var(--bg-glass);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 48px hsla(0, 0%, 0%, 0.45);
}

.modal-close {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  width: 32px;
  height: 32px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
  background: hsla(0, 0%, 100%, 0.06);
}

.modal-header {
  margin-bottom: var(--space-md);
  padding-right: var(--space-xl);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.modal-alias {
  margin-top: var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--accent-cyan);
}

.modal-summary {
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-md);
  color: var(--text-secondary);
  line-height: 1.6;
}

.modal-grid {
  display: grid;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.modal-section-title {
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.modal-list ul {
  margin: 0;
  padding-left: 1.1rem;
}

.modal-list li {
  margin-bottom: var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-list li:last-child {
  margin-bottom: 0;
}

.modal-list-strengths li::marker {
  color: var(--accent-green);
}

.modal-list-tradeoffs li::marker {
  color: var(--accent-amber);
}

.modal-best-for p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid hsla(0, 0%, 100%, 0.06);
}

.comparison-table .strategy-info-btn {
  margin-left: var(--space-xs);
  padding: 0 4px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  cursor: pointer;
  vertical-align: middle;
  transition: color var(--transition-fast);
}

.comparison-table .strategy-info-btn:hover {
  color: var(--accent-cyan);
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.controls-section .button-row {
  grid-template-columns: 1fr 1fr;
}

.controls-section {
  position: sticky;
  bottom: 0;
  z-index: 2;
  background: var(--bg-secondary);
  box-shadow: 0 -8px 16px hsla(225, 25%, 8%, 0.35);
}

/* === Center Panel (Visualization) === */
.panel-center {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  overflow: hidden;
}

.viz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  flex-shrink: 0;
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
}

.tick-display {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.tick-display .stat-value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--accent-cyan);
  font-variant-numeric: tabular-nums;
}

#simulation-canvas {
  flex: 1;
  width: 100%;
  border-radius: var(--radius-md);
  background: hsla(225, 20%, 10%, 0.5);
  border: 1px solid hsla(0, 0%, 100%, 0.04);
}

/* === Right Panel (Stats) === */
.panel-right {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.stat-card {
  background: hsla(225, 20%, 14%, 0.6);
  border: 1px solid hsla(0, 0%, 100%, 0.05);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.stat-card:hover {
  border-color: hsla(0, 0%, 100%, 0.12);
  transform: translateY(-1px);
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.stat-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  transition: color var(--transition-fast);
  line-height: 1.2;
}

.stat-unit {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

/* Elevator Status Cards */
#elevator-status-section {
  margin-top: var(--space-xs);
}

.elevator-card {
  background: hsla(225, 20%, 14%, 0.6);
  border: 1px solid hsla(0, 0%, 100%, 0.05);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color var(--transition-fast);
}

.elevator-card-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.elevator-card-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.elevator-card-detail {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.02em;
}

.badge-idle {
  background: hsla(185, 80%, 55%, 0.15);
  color: var(--accent-cyan);
}

.badge-moving {
  background: hsla(215, 90%, 60%, 0.15);
  color: var(--accent-blue);
}

.badge-door-open {
  background: hsla(155, 70%, 50%, 0.15);
  color: var(--accent-green);
}

.badge-door-opening,
.badge-door-closing {
  background: hsla(40, 90%, 60%, 0.15);
  color: var(--accent-amber);
}

/* Charts */
.chart-section {
  background: hsla(225, 20%, 12%, 0.4);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid hsla(0, 0%, 100%, 0.04);
  min-width: 0;
}

.chart-section .section-title {
  margin-bottom: var(--space-sm);
}

/* Chart.js needs a definite canvas height when its parent participates in an
   auto-sized mobile grid. Without it, canvas and parent can continuously grow. */
#chart-wait-time,
#chart-passengers {
  display: block;
  width: 100% !important;
  height: 180px !important;
}

#chart-comparison {
  display: block;
  width: 100% !important;
  height: 250px !important;
}

/* Batch Comparison Table */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
  margin-top: var(--space-md);
}

.comparison-table th {
  text-align: left;
  padding: var(--space-sm) var(--space-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: var(--font-size-xs);
  border-bottom: 1px solid hsla(0, 0%, 100%, 0.08);
}

.comparison-table td {
  padding: var(--space-sm) var(--space-sm);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  border-bottom: 1px solid hsla(0, 0%, 100%, 0.04);
}

.comparison-table tr:hover td {
  background: hsla(0, 0%, 100%, 0.03);
}

.comparison-table .best-value {
  color: var(--accent-green);
  font-weight: var(--font-weight-semibold);
}

#comparison-table-container {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
}

/* === Animations === */
@keyframes doorPulse {
  0%, 100% { box-shadow: 0 0 8px var(--elevator-door-open); }
  50% { box-shadow: 0 0 20px var(--elevator-door-open); }
}

@keyframes spawnIn {
  from { transform: scale(0); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes valueFlash {
  0% { color: var(--accent-cyan); }
  100% { color: var(--text-primary); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.stat-card {
  animation: fadeIn 0.3s ease forwards;
}

/* === Batch Progress === */
.batch-progress {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
  gap: var(--space-md);
}

.batch-progress-bar {
  width: 60%;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
}

.batch-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  border-radius: 2px;
  transition: width 0.1s linear;
}

/* === Responsive === */
@media (max-width: 1100px) {
  .app-layout {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto minmax(540px, 70vh);
    height: auto;
    min-height: 100vh;
  }
  .panel-left {
    grid-column: 1 / -1;
    grid-row: 1;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-sm);
    max-height: none;
  }
  .panel-left > .panel-title {
    flex-basis: 100%;
  }
  .config-section {
    flex: 1 1 200px;
  }
  .controls-section {
    flex: 1 1 100%;
    position: static;
  }
  body {
    overflow: auto;
    height: auto;
  }
}

@media (max-width: 700px) {
  :root {
    --space-md: 0.7rem;
    --space-lg: 0.9rem;
  }

  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(480px, 70vh) auto;
    gap: var(--space-sm);
    padding: var(--space-sm);
  }
  .panel-left {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .panel-left > .panel-title,
  .panel-left > .controls-section,
  .panel-left > #batch-controls {
    grid-column: 1 / -1;
  }

  .panel-title {
    margin-bottom: 0;
  }

  .config-section {
    margin-bottom: 0;
  }

  .panel-center {
    min-height: 480px;
  }

  .panel-right {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
  }

  .stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .stat-card {
    padding: var(--space-sm);
  }

  .stat-value {
    font-size: var(--font-size-lg);
  }

  .comparison-table {
    min-width: 520px;
    white-space: nowrap;
  }

  .viz-header {
    align-items: flex-start;
  }

  .app-title {
    font-size: var(--font-size-lg);
  }
}

@media (max-width: 479px) {
  .panel-left {
    display: flex;
    flex-direction: column;
  }

  .panel-left > .panel-title,
  .panel-left > .config-section {
    flex: 0 0 auto;
    width: 100%;
  }

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

  #chart-wait-time,
  #chart-passengers {
    height: 160px !important;
  }
}

/* === Disabled State === */
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.btn:disabled::after {
  display: none;
}