body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.card-box {
    width: 100%;
    max-width: 450px;
    border-radius: 0.5rem;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    border: 2px solid #026D66;
}
.btn-primary {
    width: 100%;
    background-color: #026D66;
    border-color: #026D66;
}
.btn-primary:hover {
    background-color: #024f50;
    border-color: #024f50;
}
.hint { font-size: 13px; color: #666; }
.card-header img {
    max-width: 200px;
}
.is-hidden {
    display: none !important;
}