/* 自定义样式 - 优化布局 */

/* 全局样式 */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* 主内容区域样式 */
.main-introduction {
    text-align: justify;
    padding: 30px 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
}

/* 应用介绍区块样式 */
.main-introduction p {
    margin-bottom: 12px;
    line-height: 1.8;
}

/* 应用标题样式 */
.main-introduction strong {
    display: block;
    font-size: 24px;
    margin: 25px 0 15px;
    color: #333;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 8px;
}

/* 下载链接样式 */
.main-introduction a {
    display: inline-block;
    margin: 15px 0;
    padding: 10px 25px;
    background-color: #3b62ff;
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(59, 98, 255, 0.3);
}

.main-introduction a:hover {
    background-color: #2a4cd7;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(59, 98, 255, 0.4);
}

/* 应用介绍卡片样式 */
.jtk-logo-wrapper {
    background-color: #f9f9f9;
    border-radius: 10px;
    padding: 25px;
    margin: 35px 0;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
    border-left: 4px solid #3b62ff;
}

.jtk-logo-wrapper:hover {
    transform: translateY(-5px);
}

.jtk-logo-wrapper img {
    display: block;
    max-width: 120px;
    margin-bottom: 20px;
    border-radius: 10px;
}

.jtk-logo-wrapper strong {
    color: #3b62ff;
    border-bottom: none;
}

/* 页脚样式优化 */
.footer {
    background-color: #f5f5f5;
    padding: 40px 0 20px;
    margin-top: 50px;
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.footer .text-1 {
    font-size: 16px;
    margin-bottom: 20px;
}

.footer .copyight {
    border-top: 1px solid #e0e0e0;
    padding-top: 20px;
    margin-top: 20px;
}

.footer .copyight a {
    color: #3b62ff;
    transition: color 0.3s;
    font-weight: bold;
}

.footer .copyight a:hover {
    color: #2a4cd7;
    text-decoration: underline;
}

/* 返回顶部按钮 */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    display: none;
    width: 50px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    background: #3b62ff;
    color: white;
    cursor: pointer;
    border-radius: 50%;
    font-size: 24px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

#back-to-top:hover {
    background: #2a4cd7;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transform: translateY(-5px);
}

@media (max-width: 768px) {
    #back-to-top {
        width: 40px;
        height: 40px;
        line-height: 40px;
        font-size: 20px;
        right: 20px;
        bottom: 20px;
    }
}

/* 导航栏优化 */
.header .nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header .nav ul {
    display: flex;
    flex-wrap: wrap;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .w1200 {
        width: 95%;
        margin: 0 auto;
    }
    
    .header .nav ul li {
        margin-right: 40px;
    }
}

@media (max-width: 768px) {
    .main-introduction {
        width: 90% !important;
        padding: 20px 15px;
    }
    
    .jtk-logo-wrapper {
        padding: 20px 15px;
    }
    
    .main-introduction strong {
        font-size: 20px;
    }
    
    .header .nav {
        flex-direction: column;
        align-items: center;
        padding-top: 10px;
    }
    
    .header .nav .logo {
        margin-bottom: 10px;
    }
    
    .header .nav ul {
        justify-content: center;
    }
    
    .header .nav ul li {
        margin: 5px 15px;
    }
    
    .header {
        height: auto;
        min-height: 400px;
    }
}

@media (max-width: 480px) {
    .header .nav .logo {
        font-size: 24px;
    }
    
    .header .nav ul li {
        margin: 5px 10px;
        font-size: 16px;
    }
    
    .main-introduction {
        width: 95% !important;
    }
    
    .header {
        min-height: 300px;
    }
}