.gradient-bg {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .file-upload-area {
            border: 2px dashed #cbd5e1;
            transition: all 0.3s ease;
        }
        .file-upload-area:hover {
            border-color: #667eea;
            background-color: #f8f9ff;
        }
        .file-upload-area.dragover {
            border-color: #667eea;
            background-color: #f0f4ff;
        }
        .success-animation {
            animation: scaleIn 0.3s ease-out;
        }
        @keyframes scaleIn {
            from {
                transform: scale(0.9);
                opacity: 0;
            }
            to {
                transform: scale(1);
                opacity: 1;
            }
        }
        .input-focus:focus {
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }