* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body.dark-mode {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #ffffff;
  color: #333333;
  min-height: 100vh;
  overflow-x: hidden;
}

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

.top-nav {
  background: #f8f8f8;
  padding: 1rem 2rem;
  border-bottom: 2px solid #ddd;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-brand h1 {
  color: #333;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}

.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
  gap: 1rem;
  padding: 1rem;
  min-height: 0; /* Flexbox overflow fix */
}

.left-panel {
  width: 350px;
  min-width: 350px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  overflow-x: hidden;
}

.right-panel {
  flex: 1;
  min-width: 0; /* Flexbox overflow fix */
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  overflow-x: hidden;
}

.card {
  background: #f5f5f5;
  border-radius: 8px;
  border: 1px solid #ddd;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  min-width: 0; /* Prevent overflow */
  display: flex;
  flex-direction: column;
}

.card-body {
  padding: 1.5rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.simulation-card {
  flex: 1;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  min-width: 0; /* Flexbox overflow fix */
}

.simulation-card .card-body {
  padding: 0;
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
}

#linkageCanvas {
  width: 100%;
  height: 100%;
  display: block;
  background: #ffffff;
  cursor: grab;
  flex: 1;
}

.zoom-controls {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  z-index: 10;
}

.zoom-btn {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  border: 1px solid #ddd;
  background: #ffffff;
  color: #333;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: all 0.2s;
}

.zoom-btn:hover {
  background: #f0f0f0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

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

#linkageCanvas:active {
  cursor: grabbing;
}

.params-image {
  text-align: center;
}

.reference-image-placeholder {
  background: #ffffff;
  border: 2px dashed #ddd;
  border-radius: 4px;
  padding: 2rem;
  color: #666;
}

.file-controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.upload-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
  background: #667eea;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
  font-weight: 500;
}

.upload-btn:hover {
  background: #5568d3;
  transform: translateY(-1px);
}

.form-select {
  width: 100%;
  padding: 0.75rem;
  background: #ffffff;
  color: #333;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.9rem;
}

.parameter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
  width: 100%;
  box-sizing: border-box;
}

.input-group {
  display: flex;
  flex-direction: column;
  min-width: 0; /* Prevent overflow */
}

.input-group label {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 0.25rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.input-group input {
  padding: 0.5rem;
  background: #ffffff;
  color: #333;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.9rem;
  width: 100%;
  box-sizing: border-box;
}

.input-group input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}

.form-group label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 100%;
  min-width: 0;
}

.form-group label span {
  font-size: 0.85rem;
  color: #666;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.form-group input,
.form-group select {
  padding: 0.5rem;
  background: #ffffff;
  color: #333;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.9rem;
  width: 100%;
  box-sizing: border-box;
}

.solution-type {
  display: flex;
  gap: 1rem;
  margin: 1rem 0;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.radio-label input[type="radio"] {
  cursor: pointer;
}

.radio-text {
  color: #333;
  font-size: 0.9rem;
}

.btn-primary {
  background: #667eea;
  border: none;
  color: white;
  padding: 0.75rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-primary:hover {
  background: #5568d3;
  transform: translateY(-1px);
}

.angle-control {
  margin-bottom: 1rem;
}

.angle-control label {
  display: block;
  margin-bottom: 0.5rem;
  color: #333;
  font-weight: 500;
}

.slider-wrapper {
  display: flex;
  align-items: center;
  gap: 1rem;
}

#angleSlider {
  flex: 1;
  height: 6px;
  background: #ddd;
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
}

#angleSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: #667eea;
  border-radius: 50%;
  cursor: pointer;
}

#angleSlider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: #667eea;
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.angle-value {
  min-width: 50px;
  text-align: right;
  color: #667eea;
  font-weight: 600;
}

.angles-display {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.angles-display span {
  padding: 0.25rem 0;
}

.trajectory-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toggle-switch {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.toggle-switch input[type="checkbox"] {
  display: none;
}

.toggle-slider {
  position: relative;
  width: 44px;
  height: 24px;
  background: #ccc;
  border-radius: 12px;
  transition: background 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  top: 3px;
  left: 3px;
  transition: transform 0.3s;
}

.toggle-switch input[type="checkbox"]:checked + .toggle-slider {
  background: #667eea;
}

.toggle-switch input[type="checkbox"]:checked + .toggle-slider::before {
  transform: translateX(20px);
}

.toggle-label {
  color: #333;
  font-size: 0.9rem;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f5f5f5;
}

::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #aaa;
}

.solution-text-container {
  max-height: 400px;
  overflow-y: auto;
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1rem;
}

.solution-text {
  margin: 0;
  color: #333;
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.solution-text-container::-webkit-scrollbar {
  width: 8px;
}

.solution-text-container::-webkit-scrollbar-track {
  background: #f5f5f5;
}

.solution-text-container::-webkit-scrollbar-thumb {
  background: #ddd;
  border-radius: 4px;
}

/* Prevent horizontal scroll */
body.dark-mode {
  overflow-x: hidden;
}

.app-container {
  overflow-x: hidden;
}

/* Fix for input number spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  opacity: 1;
}

@media (max-width: 1200px) {
  .main-content {
    flex-direction: column;
  }

  .left-panel {
    width: 100%;
    min-width: 100%;
  }

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