:root {
  --primary: #3498db;
  --primary-dark: #2980b9;
  --accent: #e74c3c;
  --text: #2c3e50;
  --text-light: #7f8c8d;
  --background: #ecf0f1;
  --card: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
  padding: var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: var(--space-sm);
}

.tagline {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
}

.card {
  background-color: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px var(--card-shadow);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px var(--card-shadow);
}

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  border: 2px dashed #bdc3c7;
  border-radius: var(--radius);
  background-color: #f9f9f9;
  transition: all 0.2s ease;
  margin-bottom: var(--space-lg);
  cursor: pointer;
}

.upload-zone:hover {
  border-color: var(--primary);
  background-color: rgba(52, 152, 219, 0.05);
}

.upload-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-md);
  color: var(--primary);
}

.upload-text {
  text-align: center;
  margin-bottom: var(--space-sm);
}

.file-input {
  display: none;
}

.file-name {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: var(--space-sm);
  word-break: break-all;
  max-width: 100%;
  text-align: center;
}

.button {
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-width: 150px;
}

.button:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(1px);
}

.button-accent {
  background-color: var(--accent);
}

.actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

.description {
  font-size: 1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: var(--space-md) auto 0;
}

.inline-examples {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin: var(--space-md) auto;
  flex-wrap: nowrap;
  max-width: 700px;
}

.example-pair {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.arrow {
  color: var(--primary);
  font-weight: bold;
  margin: 0 0.25rem;
}

.tiny-img {
  width: 32px;
  height: 32px;
  object-fit: cover;
  transition: transform 0.2s ease;
}

.tiny-img:hover {
  transform: scale(1.5);
  z-index: 1;
}

.footer {
  margin-top: auto;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-light);
  padding: var(--space-md) 0;
}

@media (max-width: 768px) {
  .container {
    padding: var(--space-md);
  }
  
  h1 {
    font-size: 1.8rem;
  }
  
  .card {
    padding: var(--space-md);
  }

  .inline-examples {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
}
.preset-selection {
  margin: var(--space-md) 0;
  text-align: center;
}

.preset-selection select {
  padding: var(--space-sm);
  border-radius: var(--radius);
  border: 1px solid #bdc3c7;
  background-color: var(--card);
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: all 0.2s ease;
  outline: none;
  min-width: 180px;
}

.preset-selection select:hover, .preset-selection select:focus {
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.preset-selection select:focus {
  border-color: var(--primary-dark);
}

.preset-selection label {
  font-weight: 600;
  margin-right: var(--space-sm);
}

.preset-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.preset-card {
  background-color: rgba(52, 152, 219, 0.05);
  border-radius: var(--radius);
  padding: var(--space-md);
  border-left: 3px solid var(--primary);
  transition: transform 0.2s ease;
}

.preset-card:hover {
  transform: translateY(-2px);
}

.preset-card h3 {
  color: var(--primary-dark);
  margin-bottom: var(--space-sm);
  font-size: 1.1rem;
}

.preset-card p {
  font-size: 0.95rem;
  color: var(--text);
}

.preview {
  display: flex;
  gap: var(--space-md);
  margin: var(--space-md) 0;
  justify-content: center;
  flex-wrap: wrap;
}

.preview-item {
  flex: 1 1 240px;
  max-width: 360px;
  text-align: center;
}

.preview-item h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin-bottom: var(--space-sm);
}

.preview-item img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid #bdc3c7;
  background-color: #f9f9f9;
}

.preview-status {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-light);
  min-height: 1.2em;
  margin-bottom: var(--space-sm);
}

.button:disabled {
  background-color: #bdc3c7;
  cursor: not-allowed;
  transform: none;
}

.button:disabled:hover {
  background-color: #bdc3c7;
  transform: none;
}