body, html {
    height: 100%;
    margin: 0;
    font-family: 'Arial', sans-serif;
    background-color: #f8f9fa;
}


.header-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #a40001;
    color: white;
    text-align: center;
    padding: 20px 0;
    height: auto;
}

    .header-nav img {
        max-width: 100%;
        height: auto;
        width: auto; 
    }


.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #ffffff;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}


.form-container {
    padding: 2rem;
    border-radius: 15px;
}


label {
    font-weight: bold;
    color: #333;
}

.btn-primary {
    background-color: #a40001;
    border-color: #a40001;
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

    .btn-primary:hover {
        background-color: #bd2b39;
        border-color: #bd2b39;
    }

.form-control {
    border-radius: 5px;
}


.field-validation-error {
    color: #d9534f;
}

.field-validation-valid {
    color: #3c763d;
}
/* 设置下拉框样式 */
.custom-select {
    width: auto;
    display: inline-block;
    vertical-align: middle;
}

.no-schedule {
    color: red;
    text-align: center;
    margin-top: 10px;
}
@media (max-width: 992px) {
    .container {
        padding: 15px;
    }

    .form-container {
        padding: 1.5rem;
    }

    .header-nav img {
        max-width: 80%;
    }
}

@media (max-width: 768px) {
    .header-nav {
        padding: 10px 0;
    }

    .form-group {
        margin-bottom: 10px;
    }

    .btn-primary {
        padding: 0.4rem 1rem;
    }

    .form-control {
        font-size: 16px; 
    }

    label {
        font-size: 18px;
    }
}

@media (max-width: 576px) {
    .header-nav img {
        max-width: 90%; 
    }

    .btn-primary {
        padding: 0.3rem 0.8rem;
    }
}