.bg-gray {
    background: #F8F9FA;
}

.form-card {
    border: none;
    border-radius: 1.25rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.form-control:focus, .form-select:focus {
    border-color: #4f46e5;
    box-shadow: 0 0 0 0.25rem rgba(79, 70, 229, 0.15);
}

/* 按鈕自訂顏色 (優雅靛藍) */
.btn-custom {
    background-color: #4f46e5;
    border-color: #4f46e5;
    color: #ffffff;
    transition: all 0.2s ease;
}

    .btn-custom:hover {
        background-color: #4338ca;
        border-color: #4338ca;
        color: #ffffff;
    }
/* 隱藏原生提交時的預設載入符號 */
.spinner-border {
    display: none;
}

.validation-summary.subtle {
    border-left: 4px solid #dc3545;
    padding: 10px 14px;
    background: #fff5f5;
    color: #b02a37;
    margin-bottom: 15px;
    margin-top: 5px;
    font-size: 14px;
}

    .validation-summary.subtle ul {
        margin: 0;
        padding-left: 18px;
    }

.validation-summary.alert-box {
    background: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 15px;
    line-height: 1.5;
}

    .validation-summary.alert-box ul {
        margin: 0;
        padding-left: 20px;
    }