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

body {
  font-family: 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #275B9C 0%, #58C8E7 100%);
  min-height: 100vh;
  padding: 20px;
  color: #707170;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

header {
  text-align: center;
  color: white;
  margin-bottom: 40px;
  padding: 20px;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  font-weight: 700;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

main {
  background: #EFEFEF;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Upload Section */
.upload-section {
  margin-bottom: 30px;
}

.upload-label {
  display: block;
  padding: 60px 40px;
  border: 3px dashed #275B9C;
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: white;
}

.upload-label:hover {
  border-color: #58C8E7;
  background: #fdfdfd;
  transform: translateY(-2px);
}

/* Loading Indicator */
.loading-indicator {
  text-align: center;
  padding: 40px;
  background: #f8f9ff;
  border-radius: 12px;
  margin-bottom: 30px;
}

.spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto 15px;
  border: 4px solid #ddd;
  border-top: 4px solid #275B9C;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

  100% {
    transform: rotate(360deg);
  }
}

.loading-indicator p {
  color: #275B9C;
  font-weight: 600;
  font-size: 1.1rem;
}

/* Color Picker */
.color-picker-section {
  background: #f8f9ff;
  padding: 30px;
  border-radius: 12px;
  margin-bottom: 30px;
}

.color-picker-section h3 {
  margin-bottom: 10px;
  color: #333;
}

.color-hint {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.swatch-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

.color-swatch {
  background: white;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.color-swatch:hover {
  border-color: #275B9C;
  transform: translateY(-2px);
}

.color-swatch.selected {
  border-color: #275B9C;
  background: #fdfdfd;
}

.swatch-preview {
  width: 100%;
  height: 40px;
  border-radius: 4px;
  border: 1px solid #ddd;
}

.swatch-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.swatch-info input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.swatch-label {
  font-size: 0.85rem;
  color: #333;
  font-weight: 600;
  flex: 1;
}

.swatch-count {
  font-size: 0.75rem;
  color: #999;
}

.apply-btn {
  width: 100%;
  padding: 12px 20px;
  background: linear-gradient(135deg, #275B9C 0%, #58C8E7 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.apply-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

/* Format Selector */
.format-buttons {
  display: flex;
  gap: 10px;
}

.format-btn {
  flex: 1;
  padding: 10px 15px;
  background: white;
  border: 2px solid #e0e0e0;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  color: #666;
}

.format-btn:hover {
  border-color: #275B9C;
  color: #275B9C;
}

.format-btn.active {
  background: linear-gradient(135deg, #275B9C 0%, #58C8E7 100%);
  color: white;
  border-color: #275B9C;
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 15px;
}

/* Controls */
.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 30px;
  padding: 20px;
  background: #f8f9ff;
  border-radius: 12px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.control-group label {
  font-weight: 600;
  color: #333;
  font-size: 0.9rem;
}

.control-group input[type="range"] {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: #ddd;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #275B9C;
  cursor: pointer;
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #275B9C;
  cursor: pointer;
  border: none;
}

.control-group span {
  font-weight: 700;
  color: #275B9C;
  font-size: 1.2rem;
}

.control-group select {
  width: 100%;
  padding: 10px 15px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 1rem;
  background: white;
  cursor: pointer;
  transition: all 0.3s ease;
}

.control-group select:hover,
.control-group select:focus {
  border-color: #275B9C;
  outline: none;
}

.sock-type-group {
  grid-column: 1 / -1;
}

.download-btn {
  grid-column: 1 / -1;
  padding: 15px 30px;
  background: linear-gradient(135deg, #275B9C 0%, #58C8E7 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(39, 91, 156, 0.3);
}

/* Preview Section */
.preview-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.preview-panel {
  text-align: center;
}

.preview-panel h3 {
  margin-bottom: 15px;
  color: #333;
  font-size: 1.2rem;
}

canvas {
  max-width: 100%;
  height: auto;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  background: white;
}

@media (max-width: 768px) {

  .preview-container,
  .controls {
    grid-template-columns: 1fr;
  }

  main {
    padding: 20px;
  }
}