:root {
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --background-color: #f8f9fa;
  --text-color: #343a40;
  --card-bg: #ffffff;
  --border-color: #dee2e6;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

body {
  font-family: var(--font-family);
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

header {
  background-color: var(--card-bg);
  padding: 1.5rem 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

header p {
  margin: 0.5rem 0 0;
  color: #6c757d;
}

main {
  display: flex;
  flex-wrap: wrap;
  padding: 2rem;
  gap: 2rem;
}

.controls-container {
  flex: 1;
  min-width: 300px;
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  align-self: flex-start;
}

.controls-container h2 {
  margin-top: 0;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

#image-upload {
  display: none;
}

.upload-label {
  display: block;
  background-color: var(--background-color);
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
}

.upload-label:hover {
  background-color: #e9ecef;
  border-color: var(--primary-color);
}

.file-name-display {
  margin-top: 1rem;
  font-style: italic;
  color: #6c757d;
  word-break: break-all;
}

#style-select {
  width: 100%;
  padding: 0.75rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

#generate-button {
  width: 100%;
  padding: 0.8rem 1.5rem;
  font-size: 1.1rem;
  font-weight: bold;
  color: #fff;
  background-color: var(--primary-color);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

#generate-button:hover {
  background-color: var(--primary-hover);
}

#generate-button:disabled {
  background-color: #6c757d;
  cursor: not-allowed;
}

.results-container {
  flex: 2;
  min-width: 300px;
  position: relative;
}

.image-comparison {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.image-box {
  flex: 1;
  min-width: 250px;
  background: var(--card-bg);
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.image-box h3 {
  margin-top: 0;
}

.image-box img {
  max-width: 100%;
  border-radius: 4px;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.spinner-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border-radius: 8px;
  z-index: 10;
}

.spinner {
  border: 8px solid #f3f3f3;
  border-top: 8px solid var(--primary-color);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 1s linear infinite;
}

.spinner-container p {
  margin-top: 1rem;
  font-weight: bold;
}

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

@media (max-width: 768px) {
  main {
    flex-direction: column;
  }
}