* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style: none;
    text-decoration: none;
}
.container {
    width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}
/* 导航栏 */
.header {
    background: #fff;
    box-shadow: 0 2px 8px #eee;
}
.nav-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}
.logo {
    font-size: 24px;
    font-weight: bold;
    color: #222;
}
.nav-list {
    display: flex;
    gap: 30px;
}
.nav-item a {
    color: #333;
    font-size: 16px;
}
.nav-item.active a {
    color: #0066cc;
}
.menu-btn {
    display: none;
    font-size: 24px;
}
/* 横幅 */
.banner {
    height: 450px;
    background: #f5f7fa;
    display: flex;
    align-items: center;
}
.banner-text h1 {
    font-size: 36px;
    margin-bottom: 15px;
}
.banner-text p {
    font-size: 18px;
    color: #555;
    margin-bottom: 25px;
}
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: #0066cc;
    color: #fff;
    border-radius: 4px;
}
/* 通用标题 */
.title {
    text-align: center;
    padding: 60px 0 40px;
}
.title h2 {
    font-size: 28px;
    margin-bottom: 8px;
}
.title span {
    color: #777;
    font-size: 14px;
}
/* 企业简介 */
.about-wrap {
    display: flex;
    gap: 40px;
    align-items: center;
    padding-bottom: 60px;
}
.about-img {
    width: 50%;
    height: 300px;
    background: #eee;
}
.about-text {
    width: 50%;
}
.about-text h3 {
    font-size: 22px;
    margin-bottom: 20px;
}
.about-text p {
    line-height: 1.8;
    color: #444;
    margin-bottom: 16px;
}
.data-row {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}
.data-item {
    flex: 1;
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
}
.data-item h4 {
    font-size: 18px;
    margin-bottom: 6px;
}
/* 产品展示 */
.product-list {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
    padding-bottom: 60px;
}
.product-card {
    background: #fff;
    border: 1px solid #eee;
}
.card-img {
    height: 160px;
    background: #eee;
}
.product-card h4 {
    padding: 12px 15px 6px;
}
.product-card p {
    padding: 0 15px 15px;
    font-size: 14px;
    color: #555;
    line-height: 1.6;
}
/* 科普板块 */
.knowledge-list {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 25px;
    padding-bottom: 60px;
}
.knowledge-item {
    padding: 25px;
    background: #f8f9fa;
}
.knowledge-item h4 {
    margin-bottom: 12px;
    font-size: 18px;
}
.knowledge-item p {
    line-height: 1.7;
    color: #444;
}
/* 企业动态 */
.news-list {
    padding-bottom: 60px;
}
.news-item {
    padding: 20px;
    border-bottom: 1px solid #eee;
}
.news-date {
    font-size: 14px;
    color: #888;
}
.news-item h4 {
    margin: 8px 0;
}
.news-item h4 a {
    color: #222;
}
.news-item p {
    color: #555;
    line-height: 1.6;
}
/* 联系我们 */
.contact {
    padding-bottom: 60px;
}
.contact-info {
    max-width: 800px;
    margin: 0 auto;
}
.info-row {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px dashed #eee;
}
.info-row h5 {
    width: 140px;
    font-size: 16px;
    color: #222;
}
.info-row.tips {
    margin-top: 15px;
    color: #0066cc;
}
/* 底部 */
.footer {
    background: #222;
    color: #ccc;
    padding: 50px 0 20px;
}
.footer-top {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 30px;
    margin-bottom: 40px;
}
.footer-col h4 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #fff;
}
.footer-col p {
    line-height: 1.7;
    font-size: 14px;
}
.footer-col ul li {
    margin-bottom: 8px;
}
.footer-col ul li a {
    color: #ccc;
}
.copyright {
    text-align: center;
    line-height: 2;
    font-size: 14px;
}