/* Thermal Expansion Simulator Styles */
.thermal-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.thermal-header {
  text-align: center;
  margin-bottom: 30px;
}

.thermal-header h2 {
  font-size: 2.2rem;
  color: #0072ff;
  margin-bottom: 10px;
}

.thermal-header p {
  font-size: 1.1rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

/* Controls Section */
.thermal-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.control-panel {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  padding: 20px;
  border: 1px solid #e0e0e0;
}

.control-panel h3 {
  color: #222;
  font-size: 1.2rem;
  margin-bottom: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-panel h3::before {
  content: '';
  width: 4px;
  height: 20px;
  background: linear-gradient(to bottom, #0072ff, #00c6ff);
  border-radius: 2px;
}

.control-group {
  margin-bottom: 15px;
}

.control-group label {
  display: block;
  font-size: 0.95rem;
  color: #222;
  font-weight: 500;
  margin-bottom: 5px;
}

.control-group input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #e0e0e0;
  outline: none;
  accent-color: #0072ff;
}

.control-group input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background: #fff;
  color: #333;
  font-size: 0.9rem;
}

.control-group input[type="number"]:focus {
  outline: none;
  border-color: #0072ff;
  box-shadow: 0 0 0 2px rgba(0, 114, 255, 0.1);
}

.control-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background: #fff;
  color: #333;
  font-size: 0.9rem;
}

.control-group select:focus {
  outline: none;
  border-color: #0072ff;
  box-shadow: 0 0 0 2px rgba(0, 114, 255, 0.1);
}

.control-group input[type="radio"] {
  margin-right: 8px;
  transform: scale(1.2);
  accent-color: #0072ff;
}

.control-group input[type="checkbox"] {
  margin-right: 8px;
  transform: scale(1.2);
  accent-color: #0072ff;
}

.radio-group {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.radio-item {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  background: #f8f9fa;
  cursor: pointer;
  transition: all 0.2s ease;
}

.radio-item:hover {
  background: #e3f2fd;
  border-color: #0072ff;
}

.radio-item input[type="radio"]:checked + label {
  color: #0072ff;
  font-weight: 600;
}

.radio-item input[type="radio"]:checked {
  background: #0072ff;
}

/* Dark Mode Button */
#thermalDarkModeBtn {
  display: block;
  margin: 0 auto 20px auto;
  background: linear-gradient(90deg, #00c6ff, #0072ff);
  color: #fff;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  padding: 10px 22px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14px;
}

#thermalDarkModeBtn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 114, 255, 0.3);
}

.dark-mode #thermalDarkModeBtn {
  background: linear-gradient(90deg, #00c6ff, #0072ff);
}

/* Button Styles */
.thermal-btn {
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.thermal-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 114, 255, 0.3);
}

.thermal-btn.secondary {
  background: linear-gradient(135deg, #6c757d, #adb5bd);
}

.thermal-btn.secondary:hover {
  box-shadow: 0 4px 8px rgba(108, 117, 125, 0.3);
}

.thermal-btn.danger {
  background: linear-gradient(135deg, #dc3545, #ff6b6b);
}

.thermal-btn.danger:hover {
  box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
}

.button-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Canvas Section */
.canvas-section {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  padding: 20px;
  margin-bottom: 30px;
  border: 1px solid #e0e0e0;
}

.canvas-wrapper {
  text-align: center;
  margin-bottom: 20px;
}

.canvas-wrapper canvas {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Data Panel */
.data-panel {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  padding: 20px;
  margin-bottom: 30px;
  border: 1px solid #e0e0e0;
}

.data-panel h3 {
  color: #222;
  font-size: 1.2rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.data-item {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
  border-left: 4px solid #0072ff;
}

.data-label {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 5px;
}

.data-value {
  font-size: 1.1rem;
  font-weight: 600;
  color: #222;
}

.formula-display {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  margin-bottom: 15px;
}

.formula-text {
  font-family: 'Courier New', monospace;
  font-size: 1.1rem;
  color: #0072ff;
  font-weight: 600;
  margin-bottom: 5px;
}

.result-text {
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  color: #666;
}

/* Comparison Section */
.comparison-section {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  padding: 20px;
  margin-bottom: 30px;
  border: 1px solid #e0e0e0;
}

.comparison-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.comparison-toggle input[type="checkbox"] {
  transform: scale(1.5);
}

.comparison-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
  width: 100%;
  box-sizing: border-box;
}

.comparison-column {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  min-width: 0; /* allow content to shrink within grid */
}

.comparison-column h4 {
  color: #222;
  font-size: 1.1rem;
  margin-bottom: 15px;
  text-align: center;
}

.comparison-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin-top: 20px;
}

.comparison-result {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
  text-align: center;
  border: 1px solid #e0e0e0;
}

.comparison-result h5 {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 5px;
}

.comparison-result .value {
  color: #0072ff;
  font-size: 1.1rem;
  font-weight: 600;
}

/* Graph Section */
.graph-section {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  padding: 20px;
  margin-bottom: 30px;
  border: 1px solid #e0e0e0;
}

.graph-section h3 {
  color: #222;
  font-size: 1.2rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.graph-wrapper {
  text-align: center;
}

.graph-wrapper canvas {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
}

/* Info Panel */
.info-panel {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  padding: 20px;
  margin-bottom: 30px;
  border: 1px solid #e0e0e0;
}

.info-panel h3 {
  color: #222;
  font-size: 1.2rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.info-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.info-section h4 {
  color: #0072ff;
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.info-section ul {
  list-style: none;
  padding: 0;
}

.info-section li {
  padding: 5px 0;
  border-bottom: 1px solid #f0f0f0;
  color: #666;
}

.info-section li:last-child {
  border-bottom: none;
}

/* Dark mode styles */
.dark-mode .thermal-container,
.dark-mode .control-panel,
.dark-mode .canvas-section,
.dark-mode .data-panel,
.dark-mode .comparison-section,
.dark-mode .graph-section,
.dark-mode .info-panel {
  background: #2d3748;
  border-color: #4a5568;
  color: #e2e8f0;
}

.dark-mode .thermal-header h2 {
  color: #63b3ed;
}

.dark-mode .thermal-header p {
  color: #a0aec0;
}

.dark-mode .control-panel h3,
.dark-mode .data-panel h3,
.dark-mode .comparison-section h3,
.dark-mode .graph-section h3,
.dark-mode .info-panel h3 {
  color: #e2e8f0;
}

.dark-mode .control-group label {
  color: #e2e8f0;
}

.dark-mode .control-group input[type="number"],
.dark-mode .control-group select {
  background: #4a5568;
  border-color: #718096;
  color: #e2e8f0;
}

.dark-mode .control-group input[type="number"]:focus,
.dark-mode .control-group select:focus {
  border-color: #0072ff;
  box-shadow: 0 0 0 2px rgba(0, 114, 255, 0.2);
}

.dark-mode .radio-item {
  background: #4a5568;
  border-color: #718096;
  color: #e2e8f0;
}

.dark-mode .radio-item:hover {
  background: #2d3748;
  border-color: #0072ff;
}

.dark-mode .data-item,
.dark-mode .comparison-column,
.dark-mode .comparison-result {
  background: #4a5568;
  border-color: #718096;
  color: #e2e8f0;
}

.dark-mode .data-label,
.dark-mode .comparison-result h5 {
  color: #a0aec0;
}

.dark-mode .data-value,
.dark-mode .comparison-result .value {
  color: #0072ff;
}

.dark-mode .formula-display {
  background: #4a5568;
  border-color: #718096;
}

.dark-mode .formula-text {
  color: #0072ff;
}

.dark-mode .result-text {
  color: #a0aec0;
}

.dark-mode .info-section h4 {
  color: #0072ff;
}

.dark-mode .info-section li {
  color: #a0aec0;
  border-bottom-color: #4a5568;
}

.dark-mode canvas#thermalCanvas {
  background: linear-gradient(180deg, #2d3748, #4a5568);
  border-color: #63b3ed;
}

.dark-mode .canvas-wrapper {
  background: #4a5568;
  border-color: #63b3ed;
}

/* Responsive Design */
@media (max-width: 768px) {
  .thermal-controls {
    grid-template-columns: 1fr;
  }
  
  .comparison-controls {
    grid-template-columns: 1fr;
  }
  
  .comparison-results {
    grid-template-columns: 1fr;
  }
  
  .info-content {
    grid-template-columns: 1fr;
  }
  
  .data-grid {
    grid-template-columns: 1fr;
  }
  
  .button-group {
    flex-direction: column;
  }
  
  .radio-group {
    flex-direction: column;
  }
  
  .thermal-header h2 {
    font-size: 1.8rem;
  }
  
  .control-panel {
    padding: 15px;
  }
}

@media (max-width: 480px) {
  .thermal-container {
    padding: 10px;
  }
  
  .thermal-header h2 {
    font-size: 1.5rem;
  }
  
  .thermal-header p {
    font-size: 1rem;
  }
  
  .control-panel h3 {
    font-size: 1.1rem;
  }
  
  .data-value {
    font-size: 1rem;
  }
  
  .formula-text {
    font-size: 1rem;
  }
}

/* Animation for temperature changes */
@keyframes temperatureGlow {
  0% { box-shadow: 0 0 5px rgba(0, 114, 255, 0.3); }
  50% { box-shadow: 0 0 20px rgba(0, 114, 255, 0.6); }
  100% { box-shadow: 0 0 5px rgba(0, 114, 255, 0.3); }
}

.temperature-changing {
  animation: temperatureGlow 1s ease-in-out infinite;
}

/* Material color indicators */
.material-indicator {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  margin-right: 8px;
  border: 2px solid #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #0072ff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}