body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card {
    border: none;
    border-radius: 12px;
}

.card-header {
    border-radius: 12px 12px 0 0 !important;
}

.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

#input {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    transition: border-color 0.2s ease;
}

#input:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.resultaat-item {
    padding: 8px 12px;
    margin: 4px 0;
    background-color: #e8f5e8;
    border-radius: 6px;
    border-left: 4px solid #198754;
}

.file-upload {
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.file-upload:hover {
    border-color: #0d6efd;
}

.file-upload.dragover {
    border-color: #0d6efd;
    background-color: #f8f9fa;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .display-5 {
        font-size: 2rem;
    }
    
    .d-md-flex {
        flex-direction: column;
    }
    
    .me-md-2 {
        margin-right: 0 !important;
        margin-bottom: 10px;
    }
}