/* 重置默认样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
    opacity: 0;
    transition: opacity 0.3s;
}

body.loaded {
    opacity: 1;
}

/* 通用容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 横幅样式 */
.banner {
    background: linear-gradient(135deg, #1a3f6b 0%, #0a1f35 100%);
    color: #fff;
    padding: 40px 0;
    text-align: center;
}

.banner h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    animation: fadeInDown 1s ease-out;
}

.banner p {
    font-size: 1.2em;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out;
}

/* 导航菜单 */
.main-nav {
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-list {
    list-style: none;
    display: flex;
    justify-content: center;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    display: block;
    padding: 15px 25px;
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-item > a:hover {
    color: #e60012;
}

/* 二级菜单 */
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    min-width: 200px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    list-style: none;
}

.nav-item:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu li a {
    display: block;
    padding: 10px 20px;
    color: #333;
    text-decoration: none;
    transition: background 0.3s;
}

.submenu li a:hover {
    background: #f5f5f5;
    color: #e60012;
}

/* 轮播图样式 */
.slider {
    position: relative;
    margin: 30px 0;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.slide-container {
    display: flex;
    transition: transform 0.5s ease;
}

.slide {
    min-width: 100%;
    height: 400px;
    object-fit: cover;
}

.slider-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: background 0.3s;
}

.dot.active {
    background: #fff;
}

/* 新闻部分 */
.news-section {
    padding: 40px 0;
}

.news-section h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #1a3f6b;
}

.news-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.news-item {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.news-item:hover {
    transform: translateY(-5px);
}

.news-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-item h3 {
    padding: 15px;
    color: #1a3f6b;
}

.news-item p {
    padding: 0 15px 15px;
    color: #666;
}

/* 页脚 */
.footer {
    background: #1a3f6b;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}

/* 动画关键帧 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-list {
        flex-direction: column;
    }

    .nav-item {
        width: 100%;
    }

    .submenu {
        position: static;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
    }

    .nav-item:hover .submenu {
        display: block;
    }

    .slide {
        height: 300px;
    }

    .news-container {
        grid-template-columns: 1fr;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 35px;
        height: 35px;
    }

    .network-status {
        top: auto;
        bottom: 70px;
        right: 10px;
        left: 10px;
        text-align: center;
    }
} 

/* Loading动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: #3498db;
    color: white;
    border-radius: 50%;
    display: none;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background 0.3s;
    z-index: 999;
}

.back-to-top:hover {
    background: #2980b9;
}

/* 网络状态提示 */
.network-status {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px 20px;
    border-radius: 5px;
    color: white;
    font-size: 14px;
    display: none;
    z-index: 9999;
}

.network-status.offline {
    background: #e74c3c;
    display: block;
}

.network-status.online {
    background: #2ecc71;
    display: block;
    animation: fadeOut 2s forwards;
}

@keyframes fadeOut {
    0% { opacity: 1; }
    90% { opacity: 1; }
    100% { opacity: 0; display: none; }
}

/* 移动端优化 */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 35px;
        height: 35px;
    }

    .network-status {
        top: auto;
        bottom: 70px;
        right: 10px;
        left: 10px;
        text-align: center;
    }
}

/* 页面切换动画 */
body {
    opacity: 0;
    transition: opacity 0.3s;
}

body.loaded {
    opacity: 1;
}
</rewritten_file>