.mode-btn {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    transition: all 0.2s;
}

.mode-btn:hover, .mode-btn.active {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.mode-btn.active {
    background-color: #0d6efd;
    color: white;
    border-color: #0d6efd;
}

.drop-zone {
    cursor: pointer;
    transition: all 0.2s;
    min-height: 280px;
}

.drop-zone:hover {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.25rem rgba(13,110,253,0.1);
}

.drop-zone.dragover {
    border-color: #0d6efd !important;
    background-color: rgba(13,110,253,0.05);
}

.result-card {
    border-radius: 0.75rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.preview-iframe {
    width: 100%;
    height: 300px;
    border-radius: 0.5rem;
    border: 1px solid #dee2e6;
}