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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .container {
            width: 100%;
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
        }

        .card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            padding: 60px 40px;
            text-align: center;
            color: white;
        }

        .header h1 {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .header p {
            font-size: 1.2rem;
            opacity: 0.9;
        }

        .content {
            padding: 40px;
        }

        /* Login Styles */
        .login-container {
            max-width: 400px;
            margin: 0 auto;
            text-align: center;
        }

        .login-title {
            font-size: 2rem;
            color: #333;
            margin-bottom: 10px;
        }

        .login-subtitle {
            color: #666;
            margin-bottom: 40px;
            font-size: 1.1rem;
        }

        .form-group {
            margin-bottom: 25px;
            text-align: left;
        }

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

        .form-group input {
            width: 100%;
            padding: 15px;
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }

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

        .login-btn {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s ease;
        }

        .login-btn:hover {
            transform: translateY(-2px);
        }

        .error-message {
            color: #e74c3c;
            margin-top: 15px;
            font-size: 0.9rem;
        }

        /* Upload Area Styles */
        .upload-area {
            border: 3px dashed #667eea;
            border-radius: 15px;
            padding: 60px 20px;
            text-align: center;
            margin-bottom: 30px;
            cursor: pointer;
            transition: all 0.3s ease;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
        }

        .upload-area:hover {
            border-color: #5a67d8;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
            transform: scale(1.02);
        }

        .upload-area.drag-over {
            border-color: #48bb78;
            background: rgba(72, 187, 120, 0.1);
            transform: scale(1.05);
        }

        .upload-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 20px;
            color: #667eea;
        }

        .upload-text {
            font-size: 1.3rem;
            font-weight: 600;
            color: #333;
            margin-bottom: 10px;
        }

        .upload-subtext {
            color: #666;
            margin-bottom: 25px;
        }

        .choose-files-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 25px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s ease;
        }

        .choose-files-btn:hover {
            transform: translateY(-2px);
        }

        .selected-images {
            margin-bottom: 30px;
        }

        .selected-images h3 {
            margin-bottom: 20px;
            color: #333;
        }

        .image-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
            gap: 15px;
        }

        .image-preview {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .image-preview img {
            width: 100%;
            height: 100px;
            object-fit: cover;
        }

        .image-name {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 5px;
            font-size: 0.8rem;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .process-btn {
            width: 100%;
            padding: 18px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 1.2rem;
            font-weight: 600;
            cursor: pointer;
            margin-bottom: 30px;
            transition: transform 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .process-btn:hover:not(:disabled) {
            transform: translateY(-2px);
        }

        .process-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        .processing-indicator {
            text-align: center;
            padding: 40px;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
            border-radius: 15px;
            margin-bottom: 30px;
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 4px solid #e1e5e9;
            border-top: 4px solid #667eea;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }

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

        .results {
            background: linear-gradient(135deg, rgba(72, 187, 120, 0.05) 0%, rgba(56, 178, 172, 0.05) 100%);
            border-radius: 15px;
            padding: 30px;
        }

        .results-header {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
        }

        .check-icon {
            width: 24px;
            height: 24px;
            color: #48bb78;
        }

        .results h2 {
            color: #333;
            font-size: 1.5rem;
        }

        .download-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
            margin-top: 30px;
        }

        .download-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 15px;
            border: 2px solid #667eea;
            background: white;
            color: #667eea;
            border-radius: 10px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
        }

        .download-btn:hover {
            background: #667eea;
            color: white;
            transform: translateY(-2px);
        }

        .logout-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            padding: 10px 20px;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
        }

        .logout-btn:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        .hidden {
            display: none;
        }

        @media (max-width: 768px) {
            .container {
                padding: 10px;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .content {
                padding: 20px;
            }
            
            .download-buttons {
                grid-template-columns: 1fr;
            }
        }


/* ... your existing CSS ... */

.preview-box {
  background: #fff;
  border: 1px solid #e1e5e9;
  border-radius: 10px;
  padding: 12px;
  overflow: auto;
  max-height: 260px;
}

.code-pre {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}