body {
    background: #f8fafc;
}

.tool-card {
    max-width: 800px;
    margin: 50px auto 100px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 16px;
    padding: 24px;
}

#previewArea {
    min-height: 240px;
    border: 1px dashed #dee2e6;
    border-radius: 12px;
    padding: 16px;
    overflow: auto;
}

#result-msg {
    min-height: 20px;
}