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

body {
    font-family: 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 24px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #2c3e50;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

input.error {
    border-color: #e74c3c;
}

small {
    display: block;
    color: #7f8c8d;
    font-size: 12px;
    margin-top: 5px;
}

.error-message {
    color: #e74c3c;
    font-size: 12px;
    margin-top: 5px;
    display: none;
}

.form-actions {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button[type="submit"] {
    background-color: #3498db;
    color: white;
    width: 100%;
}

button[type="submit"]:hover {
    background-color: #2980b9;
}

button[type="button"] {
    background-color: #ecf0f1;
    color: #2c3e50;
}

button[type="button"]:hover {
    background-color: #bdc3c7;
}

.message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;
}

.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    position: relative;
    background-color: #fff;
    margin: 10% auto;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 500px;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
}

.close:hover {
    color: #333;
}

.modal h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 22px;
}

.important-notice {
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 6px;
    margin-top: 15px;
}

.important-notice p {
    font-size: 16px;
    margin-bottom: 10px;
}

.url-container {
    display: flex;
    margin: 15px 0;
}

.url-container input {
    flex: 1;
    padding: 12px;
    font-size: 14px;
    border: 1px solid #ddd;
    border-right: none;
    border-radius: 4px 0 0 4px;
    background-color: #f9f9f9;
}

.url-container button {
    padding: 12px 20px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

.url-container button:hover {
    background-color: #2980b9;
}

.highlight-notice {
    padding: 15px;
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
    border-radius: 4px;
    font-weight: bold;
    text-align: center;
    font-size: 15px;
    line-height: 1.5;
    margin-top: 15px;
}

/* 复选框样式 */
.checkbox-group {
    margin-top: 30px;
}

.checkbox-container {
    display: flex;
    position: relative;
    padding-left: 35px;
    cursor: pointer;
    font-size: 16px;
    user-select: none;
    align-items: flex-start;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 25px;
    width: 25px;
    background-color: #f8f9fa;
    border: 2px solid #ddd;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.checkbox-container:hover input ~ .checkmark {
    background-color: #e3f2fd;
    border-color: #90caf9;
}

.checkbox-container input:checked ~ .checkmark {
    background-color: #2196F3;
    border-color: #2196F3;
    transform: scale(1.05);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 9px;
    top: 5px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 3px 3px 0;
    transform: rotate(45deg);
}

.checkbox-text {
    font-size: 15px;
    line-height: 1.4;
    color: #333;
    font-weight: normal;
    max-width: calc(100% - 35px);
    padding-top: 2px;
}

.checkbox-text strong {
    font-weight: bold;
    color: #e74c3c;
}

/* 确保 required 元素的提示一致 */
input:required, 
input[type="checkbox"]:required {
    box-shadow: none;
}