:root {
    --primary-color: #4a6fa5;
    --secondary-color: #166088;
    --accent-color: #4fc3f7;
    --background-color: #f8f9fa;
    --text-color: #333;
    --light-gray: #e9ecef;
    --dark-gray: #6c757d;
    --success-color: #28a745;
    --error-color: #dc3545;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }
  
  /* Reset et styles de base */
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
  }
  
  /* Fond vidéo */
  #bg-video {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
    z-index: -1;
    opacity: 1;
    object-fit: cover;
  }
  
  /* Conteneur principal */
  .container {
    max-width: 1200px;
    margin: 2rem auto;
    background-color: rgba(255, 255, 255, 0.863);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(2px);
  }
  
  header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--light-gray);
  }
  
  header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
  }
  
  .subtitle {
    color: var(--dark-gray);
    font-size: 1.1rem;
  }
  
  /* Onglets */
  .tabs {
    display: flex;
    border-bottom: 1px solid var(--light-gray);
    margin-bottom: 1.5rem;
    overflow-x: auto;
  }
  
  .tab-button {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--dark-gray);
    transition: all 0.3s;
    white-space: nowrap;
  }
  
  .tab-button:hover {
    color: var(--primary-color);
  }
  
  .tab-button.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    font-weight: 600;
  }
  
  .tab-content {
    display: none;
    padding: 1rem 0;
    animation: fadeIn 0.5s ease;
  }
  
  .tab-content.active {
    display: block;
  }
  
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  /* Zone d'upload */
  .upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: 8px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 1.5rem;
    background-color: rgba(74, 111, 165, 0.05);
  }
  
  .upload-area:hover {
    background-color: rgba(74, 111, 165, 0.1);
    transform: translateY(-2px);
  }
  
  .upload-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
  }
  
  .file-types {
    color: var(--dark-gray);
    font-size: 0.9rem;
    margin-top: 0.5rem;
  }
  
  #fileInput {
    display: none;
  }
  
  /* Liste de fichiers */
  .file-list {
    margin: 1.5rem 0;
  }
  
  .file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    margin-bottom: 0.75rem;
    background-color: white;
    transition: transform 0.2s;
  }
  
  .file-item:hover {
    transform: translateX(5px);
  }
  
  .file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .file-icon {
    font-size: 1.2rem;
  }
  
  .file-name {
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 300px;
  }
  
  .file-type {
    color: var(--dark-gray);
    font-size: 0.8rem;
    background-color: var(--light-gray);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-left: 0.5rem;
  }
  
  /* Formulaires */
  .form-group {
    margin-bottom: 1.5rem;
  }
  
  .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary-color);
  }
  
  .file-selector, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
  }
  
  .file-selector:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.2);
  }
  
  textarea {
    resize: vertical;
    min-height: 120px;
  }
  
  /* Boutons */
  .action-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .action-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
  }
  
  .action-btn:disabled {
    background-color: var(--light-gray);
    cursor: not-allowed;
    transform: none;
  }
  
  .btn-icon {
    font-size: 1.2rem;
  }
  
  .action-area {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
  }
  
  /* Résultats */
  .result-box {
    margin: 1.5rem 0;
    padding: 1.5rem;
    border-radius: 8px;
    background-color: white;
    border: 1px solid var(--light-gray);
    min-height: 150px;
  }
  
  .result-box h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
  }
  
  .placeholder {
    color: var(--dark-gray);
    font-style: italic;
    text-align: center;
    margin: 2rem 0;
  }
  
  /* Aperçu image */
  .image-preview {
    margin: 1.5rem 0;
    text-align: center;
  }
  
  .image-preview img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
  }
  
  .preview-placeholder {
    padding: 3rem;
    border: 2px dashed var(--light-gray);
    border-radius: 8px;
    color: var(--dark-gray);
  }
  
  .placeholder-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
  }
  
  /* Messages d'état */
  .status-message {
    padding: 1rem;
    border-radius: 6px;
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .success {
    background-color: rgba(40, 167, 69, 0.15);
    color: var(--success-color);
    border: 1px solid rgba(40, 167, 69, 0.3);
  }
  
  .error {
    background-color: rgba(220, 53, 69, 0.15);
    color: var(--error-color);
    border: 1px solid rgba(220, 53, 69, 0.3);
  }
  
  .loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(74, 111, 165, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
  }
  
  @keyframes spin {
    to { transform: rotate(360deg); }
  }
  
  /* Page À propos */
  .about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }
  
  .about-card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
  }
  
  .about-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--light-gray);
  }
  
  .about-card ul {
    list-style-type: none;
  }
  
  .about-card li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--dark-gray);
    font-size: 0.9rem;
  }
  
  .version {
    font-size: 0.8rem;
    opacity: 0.7;
  }
  
  /* Responsive */
  @media (max-width: 768px) {
    .container {
      margin: 1rem;
      padding: 1.5rem;
    }
    
    header h1 {
      font-size: 2rem;
    }
    
    .upload-area {
      padding: 2rem 1rem;
    }
    
    .file-name {
      max-width: 200px;
    }
    
    .about-content {
      grid-template-columns: 1fr;
    }
    
    #bg-video {
      display: none;
    }
    
    body {
      background: linear-gradient(135deg, #4a6fa5 0%, #166088 100%);
    }
  }
  
  @media (max-width: 480px) {
    .tab-button {
      padding: 0.75rem;
      font-size: 0.9rem;
    }
    
    .file-name {
      max-width: 150px;
    }
  }