body {
    font-family: 'Sarabun', 'Prompt', 'Tahoma', sans-serif;
    background: #f4f8fb;
}
.card {
    border-radius: 1rem;
}
.btn-primary {
    background: linear-gradient(90deg, #0ea5e9 0%, #2563eb 100%);
    border: none;
}