* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    background: #f5f5f5;
}
body {
    font-family: "Microsoft YaHei", sans-serif;
    color: #333;
    background: #f9f9f9;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}
a {
    text-decoration: none;
    color: inherit;
}
ul {
    list-style: none;
}
.section-title {
    text-align: center;
    font-size: 28px;
    margin-bottom: 40px;
    position: relative;
}
.section-title::after {
    content: "";
    width: 60px;
    height: 3px;
    background: #2dacd1;
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: #2dacd1;
    color: #fff;
    border-radius: 5px;
    margin-top: 20px;
}
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 999;
}
.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}
.logo h1 {
    color: #2dacd1;
}
.nav ul {
    display: flex;
    gap: 25px;
}
.nav ul li a {
    font-weight: 500;
    padding: 8px 0;
}
.nav ul li a.active {
    color: #2dacd1;
    border-bottom: 2px solid #2dacd1;
}
.menu-toggle {
    display: none;
    font-size: 22px;
    color: #2dacd1;
}
.hero {
    height: 500px;
    background: linear-gradient(rgba(45,172,209,0.8), rgba(45,172,209,0.8)), url("https://picsum.photos/id/1048/1920/1080");
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}
.hero-content h2 {
    font-size: 36px;
    margin-bottom: 15px;
}
.advantages {
    padding: 60px 0;
    background: #fff;
}
.advantage-cards {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
}
.card {
    text-align: center;
    padding: 30px 20px;
    background: #f5f5f5;
    border-radius: 10px;
}
.card i {
    font-size: 36px;
    color: #2dacd1;
    margin-bottom: 15px;
}
.business {
    padding: 60px 0;
}
.business-grid {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
}
.business-item {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.business-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}
.business-item h3 {
    padding: 15px;
}
.business-item p {
    padding: 0 15px 15px;
    color: #666;
}
.page-header {
    background: #2dacd1;
    color: #fff;
    padding: 40px 0;
    text-align: center;
}
.page-header h2 {
    font-size: 28px;
}
.about-section {
    padding: 60px 0;
    background: #fff;
}
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}
.business-list li {
    padding: 8px 0;
}
.business-list i {
    color: #2dacd1;
    margin-right: 8px;
}
.products-section, .cases-section, .tech-section, .contact-section {
    padding: 60px 0;
}
.product-grid, .cases-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 20px;
}
.product-item {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    text-align: center;
}
.product-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}
.case-item {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
}
.case-image img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}
.case-info {
    padding: 20px;
}
.tech-area {
    padding: 30px;
    background: #fff;
    margin-bottom: 20px;
    border-radius: 10px;
    text-align: center;
}
.tech-area i {
    font-size: 36px;
    color: #2dacd1;
    margin-bottom: 15px;
}
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.submit-btn {
    width: 100%;
    padding: 12px;
    background: #2dacd1;
    color: #fff;
    border: none;
    border-radius: 5px;
}
.map-container {
    position: relative;
}
.map-btn {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #2dacd1;
    color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
}
.footer {
    background: #2c3e50;
    color: #fff;
    padding: 40px 0 20px;
    margin-top: 40px;
}
.footer-content {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 30px;
}
.copyright {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #445;
    color: #ccc;
}
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .advantage-cards, .business-grid, .product-grid, .cases-grid, .about-content, .contact-content, .footer-content {
        grid-template-columns: 1fr;
    }
    .hero {
        height: 350px;
    }
    .hero-content h2 {
        font-size: 24px;
    }
}