body {
    font-family: system-ui, -apple-system, sans-serif;
    background: #f3f4f6;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 600px;
    margin: 0 auto;
}
.info-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}
.parent {
    background: #eff6ff;
    padding: 30px;
    border: 2px dashed #93c5fd;
    border-radius: 8px;
    cursor: pointer;
    margin: 20px 0;
}
.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: box-shadow 0.3s ease;
}
.card:hover {
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.btn {
    display: inline-block;
    background: #3b82f6;
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    transition: background 0.3s ease;
}
.btn:hover {
    background: #2563eb;
}
.explanation {
    margin-top: 20px;
    line-height: 1.5;
}