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

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

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

.header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 28px;
    font-weight: bold;
}

.contact-info {
    text-align: right;
    font-size: 16px;
}

.contact-info p {
    margin: 5px 0;
}

.contact-info .phone {
    font-size: 24px;
    font-weight: bold;
    color: #ffcc00;
}

.nav {
    background-color: #fff;
    border-bottom: 3px solid #1e3c72;
}

.nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
}

.nav li {
    padding: 15px 25px;
}

.nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.nav a:hover {
    color: #1e3c72;
}

.banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.banner h1 {
    font-size: 36px;
    margin-bottom: 20px;
}

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

.banner .btn {
    display: inline-block;
    background-color: #ff6b35;
    color: white;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 18px;
    font-weight: bold;
}

.main-content {
    padding: 40px 0;
}

.section {
    background-color: white;
    padding: 40px;
    margin-bottom: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.section h2 {
    color: #1e3c72;
    font-size: 28px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #1e3c72;
}

.section h3 {
    color: #2a5298;
    font-size: 22px;
    margin: 25px 0 15px;
}

.section p {
    margin-bottom: 15px;
    font-size: 16px;
    text-align: justify;
}

.section ul, .section ol {
    margin-left: 30px;
    margin-bottom: 15px;
}

.section li {
    margin-bottom: 10px;
    font-size: 16px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.product-card {
    background-color: #f9f9f9;
    padding: 25px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    transition: transform 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.product-card h4 {
    color: #1e3c72;
    font-size: 20px;
    margin-bottom: 15px;
}

.contact-box {
    background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    color: white;
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    margin-top: 30px;
}

.contact-box h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: white;
}

.contact-box .contact-item {
    font-size: 20px;
    margin: 15px 0;
}

.contact-box .contact-item strong {
    font-size: 24px;
}

.footer {
    background-color: #1e3c72;
    color: white;
    padding: 40px 0;
    margin-top: 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.footer-section h4 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #ffcc00;
}

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

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
}

.footer-section a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    margin-top: 30px;
    border-top: 1px solid #3a5a8a;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-info {
        text-align: center;
        margin-top: 15px;
    }
    
    .banner h1 {
        font-size: 28px;
    }
    
    .section {
        padding: 25px;
    }
}