/* QQ登录按钮样式 */
.qq-login-btn {
    background-color: #12b7f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qq-login-btn:hover {
    background-color: #00a5e0;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .login-box {
        max-width: 90%;
        padding: 20px;
        margin: 0 15px;
    }
    
    .login-header h1 {
        font-size: 20px;
    }
    
    .tab {
        padding: 8px 15px;
        font-size: 14px;
    }
    
    .form-group input,
    .login-btn, 
    .qq-login-btn {
        padding: 10px;
        font-size: 14px;
    }
    
    .captcha-img {
        width: 80px;
        height: 35px;
    }
    
    .login-footer {
        font-size: 10px;
    }
}