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

body {
    font-family: 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    color: #fff;
    padding: 10px 0;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top-right {
    display: flex;
    gap: 20px;
}

.header-main {
    padding: 20px 0;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: #1e3a5f;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 16px;
    font-weight: 500;
    color: #333;
    padding: 10px 0;
    position: relative;
    transition: color 0.3s;
}

.nav a:hover,
.nav a.active {
    color: #1e3a5f;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: #1e3a5f;
    transition: width 0.3s;
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

.banner {
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 50%, #1e3a5f 100%);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.banner h1 {
    font-size: 42px;
    margin-bottom: 20px;
}

.banner p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn-group {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 5px;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: #e74c3c;
    color: #fff;
}

.btn-primary:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #1e3a5f;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    color: #1e3a5f;
    margin-bottom: 15px;
}

.section-title p {
    color: #666;
    font-size: 16px;
}

.bg-white {
    background: #fff;
}

.bg-gray {
    background: #f9f9f9;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-item {
    background: #fff;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    border-radius: 50%;
    margin: 0 auto 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: #fff;
}

.feature-item h3 {
    font-size: 22px;
    color: #1e3a5f;
    margin-bottom: 15px;
}

.feature-item p {
    color: #666;
    line-height: 1.8;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.service-item {
    display: flex;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.service-content {
    flex: 1;
    padding: 40px;
}

.service-content h3 {
    font-size: 24px;
    color: #1e3a5f;
    margin-bottom: 20px;
}

.service-content p {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.8;
}

.service-content ul {
    list-style: none;
    margin-bottom: 25px;
}

.service-content ul li {
    padding: 8px 0;
    color: #555;
    padding-left: 25px;
    position: relative;
}

.service-content ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: bold;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-item {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s;
}

.news-item:hover {
    transform: translateY(-10px);
}

.news-img {
    height: 200px;
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 48px;
}

.news-content {
    padding: 25px;
}

.news-date {
    color: #999;
    font-size: 14px;
    margin-bottom: 10px;
}

.news-content h3 {
    font-size: 20px;
    color: #1e3a5f;
    margin-bottom: 15px;
    line-height: 1.4;
}

.news-content p {
    color: #666;
    line-height: 1.8;
}

.news-content a {
    color: #1e3a5f;
    font-weight: 600;
    display: inline-block;
    margin-top: 15px;
}

.cta {
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    color: #fff;
    text-align: center;
    padding: 80px 0;
}

.cta h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.footer {
    background: #1a1a1a;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-item h4 {
    font-size: 20px;
    margin-bottom: 25px;
    color: #fff;
}

.footer-item ul {
    list-style: none;
}

.footer-item ul li {
    margin-bottom: 12px;
}

.footer-item ul li a {
    color: #aaa;
    transition: color 0.3s;
}

.footer-item ul li a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #333;
    color: #888;
}

.breadcrumb {
    background: #f5f5f5;
    padding: 20px 0;
}

.breadcrumb a {
    color: #666;
}

.breadcrumb a:hover {
    color: #1e3a5f;
}

.breadcrumb span {
    color: #999;
    margin: 0 10px;
}

.breadcrumb .current {
    color: #1e3a5f;
}

.page-content {
    padding: 60px 0;
}

.page-title {
    font-size: 36px;
    color: #1e3a5f;
    margin-bottom: 30px;
}

.content-block {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.content-block h2 {
    color: #1e3a5f;
    margin-bottom: 20px;
    font-size: 28px;
}

.content-block h3 {
    color: #1e3a5f;
    margin: 25px 0 15px;
    font-size: 22px;
}

.content-block p {
    color: #555;
    line-height: 2;
    margin-bottom: 20px;
}

.content-block ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.content-block ul li {
    color: #555;
    line-height: 2;
    padding: 5px 0;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.contact-item {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.contact-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: #fff;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.news-list-item {
    display: flex;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.news-list-img {
    width: 300px;
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 48px;
    flex-shrink: 0;
}

.news-list-content {
    flex: 1;
    padding: 30px;
}

.news-list-content h3 {
    font-size: 24px;
    color: #1e3a5f;
    margin-bottom: 15px;
}

.news-list-content .date {
    color: #999;
    font-size: 14px;
    margin-bottom: 15px;
}

.news-list-content p {
    color: #666;
    line-height: 1.8;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-item {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.product-img {
    height: 250px;
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 64px;
}

.product-info {
    padding: 30px;
}

.product-info h3 {
    font-size: 24px;
    color: #1e3a5f;
    margin-bottom: 15px;
}

.product-info p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.8;
}

.product-info .btn {
    width: 100%;
    text-align: center;
}

.fixed-buttons {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.fixed-btn {
    padding: 15px 25px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 50px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    white-space: nowrap;
}

.mobile-menu-btn {
    display: none;
    background: #1e3a5f;
    color: #fff;
    border: none;
    padding: 10px 15px;
    font-size: 24px;
    cursor: pointer;
    border-radius: 5px;
}

@media (max-width: 1024px) {
    .feature-grid,
    .news-grid,
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    }
    
    .nav.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .header-main .container {
        position: relative;
    }
    
    .banner h1 {
        font-size: 32px;
    }
    
    .feature-grid,
    .service-grid,
    .news-grid,
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .news-list-item {
        flex-direction: column;
    }
    
    .news-list-img {
        width: 100%;
        height: 200px;
    }
    
    .service-item {
        flex-direction: column;
    }
    
    .fixed-buttons {
        left: 20px;
        right: 20px;
        bottom: 0;
        flex-direction: row;
        justify-content: space-between;
    }
    
    .fixed-btn {
        flex: 1;
        text-align: center;
        font-size: 14px;
        padding: 12px 15px;
    }
}