body {
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

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

.header h1 {
  font-size: 2.5em;
  margin: 0;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
  font-size: 1.2em;
  opacity: 0.9;
  margin: 10px 0;
}

.upload-section {
  background: white;
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  margin-bottom: 30px;
}

.file-input-wrapper {
  border: 2px dashed #ddd;
  border-radius: 10px;
  padding: 40px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.file-input-wrapper:hover {
  border-color: #667eea;
  background-color: #f8f9ff;
}

.file-input-wrapper.dragover {
  border-color: #667eea;
  background-color: #f0f4ff;
}

.file-input {
  display: none;
}

.upload-icon {
  font-size: 3em;
  color: #667eea;
  margin-bottom: 15px;
}

.upload-text {
  color: #666;
  font-size: 1.1em;
  margin-bottom: 10px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 30px 0;
}

.control-group {
  display: flex;
  align-items: center;
  flex-direction: column;
}

.control-group label {
  font-weight: 600;
  color: #333;
  margin-bottom: 8px;
}

.control-group input {
  padding: 10px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

.control-group input:focus {
  outline: none;
  border-color: #667eea;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.checkbox-group input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: #667eea;
}

.generate-btn {
  background: linear-gradient(45deg, #667eea, #764ba2);
  color: white;
  border: none;
  padding: 15px 30px;
  border-radius: 10px;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  display: block;
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.generate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.results {
  background: white;
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  margin-top: 30px;
}

.download-buttons {
  display: flex;
  gap: 15px;
  margin: 20px 0;
  flex-wrap: wrap;
  justify-content: center;
}

.download-btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.download-pixel-art {
  background: #28a745;
  color: white;
}

.download-numbers {
  background: #ffc107;
  color: #212529;
}

.download-legend {
  background: #6c757d;
  color: white;
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 30px;
}

.preview-item {
  text-align: center;
  border: 2px solid #eee;
  border-radius: 10px;
  padding: 20px;
  background: #fafafa;
}

.preview-item h3 {
  margin: 0 0 20px 0;
  color: #333;
}

.preview-item img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.loading {
  display: none;
  text-align: center;
  padding: 20px;
}

.spinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #667eea;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto 15px;
}

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

@media (max-width: 768px) {
  .preview-grid {
    grid-template-columns: 1fr;
  }

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

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
}

.desc,
.copy {
  color: white;
  text-align: center;
}