* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f7f9;
}

.container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2C3E50;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #34495e;
}

input[type="text"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23333' viewBox='0 0 12 12'%3E%3Cpath d='M10.293 3.293L6 7.586 1.707 3.293A1 1 0 00.293 4.707l5 5a1 1 0 001.414 0l5-5a1 1 0 10-1.414-1.414z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

textarea {
    height: 100px;
    resize: vertical;
}

.btn-submit {
    display: block;
    width: 100%;
    padding: 1rem;
    background-color: #3498db;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-submit:hover {
    background-color: #2980b9;
}

.message-box {
    background-color: #e8f6fd;
    border: 1px solid #b8e2f2;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-style: italic;
    color: #2980b9;
}

.retention-message {
    background-color: #e8f6fd;
    border: 1px solid #b8e2f2;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 2rem;
}

.retention-message h2 {
    color: #2980b9;
    margin-bottom: 0.5rem;
}

.helper-text {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 4px;
}

.helper-text p {
    margin-bottom: 0.5rem;
}

.warning {
    color: #721c24;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 0.75rem;
    border-radius: 4px;
    margin-top: 1rem;
}

#routerReturnInfo {
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    border-radius: 4px;
    padding: 1rem;
    margin-top: 1rem;
}

#routerReturnInfo p {
    margin-bottom: 0.5rem;
}

#routerReturnAccept {
    margin-right: 0.5rem;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 600px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover,
.close:focus {
    color: #2C3E50;
    text-decoration: none;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }

    .modal-content {
        width: 90%;
        margin: 10% auto;
    }
}