body {
    background-color: #f0f2f5;
    font-family: 'Sarabun', sans-serif;
}
.card {
    border-radius: 15px;
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.card-header {
    background: linear-gradient(45deg, #0d6efd, #0dcaf0);
    color: white;
    border-radius: 15px 15px 0 0 !important;
    padding: 20px;
}
.form-label {
    font-weight: 600;
    color: #495057;
}
.btn-primary {
    background: linear-gradient(45deg, #0d6efd, #0a58ca);
    border: none;
}
.required-star {
    color: red;
}