body {
    font-family: Arial, "Microsoft JhengHei", sans-serif;
    background: #f4f6f8;
    margin: 0;
    padding: 30px;
}

.container {
    max-width: 960px;
    margin: auto;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

button {
    padding: 10px 18px;
    margin-left: 10px;
    cursor: pointer;
}

.preview img {
    max-width: 100%;
    border: 1px solid #ccc;
    margin-bottom: 20px;
}

pre {
    background: #111827;
    color: #d1fae5;
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
}