* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft Yahei", sans-serif;
}

body {
    color: #333;
    background: #fff;
    line-height: 1.7;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section {
    padding: 80px 0;
}

.title-box {
    text-align: center;
    margin-bottom: 50px;
}

.title-box h2 {
    font-size: 32px;
    color: #00994c;
    margin-bottom: 10px;
}

.title-box p {
    color: #666;
    font-size: 15px;
}

.btn {
    display: inline-block;
    background: #00994c;
    color: #fff;
    padding: 12px 30px;
    border-radius: 30px;
    font-size: 16px;
}

.btn:hover {
    background: #007a3d;
}

/* 导航栏 */
header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 999;
    transition: 0.3s;
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #00994c;
}

.logo span {
    color: #222;
    font-size: 16px;
    font-weight: normal;
    margin-left: 8px;
}

.nav-list {
    display: flex;
    gap: 40px;
}

.nav-list li a {
    font-size: 15px;
    color: #333;
    font-weight: 500;
}

.nav-list li a:hover,
.nav-list li a.active {
    color: #00994c;
}

/* 首屏Banner */
.banner {
    width: 100%;
    height: 100vh;
    /* 替换稳定无失效通用渐变背景，无需外链图片 */
    background: linear-gradient(135deg, #00994c 0%, #006633 100%);
    display: flex;
    align-items: center;
    color: #fff;
    margin-top: 70px;
}

.banner-text h1 {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.3;
}

.banner-text p {
    font-size: 18px;
    margin-bottom: 35px;
    opacity: 0.95;
    max-width: 600px;
}

/* 关于我们 */
.about-text p {
    font-size: 16px;
    color: #555;
    margin-bottom: 15px;
    text-indent: 2em;
}

.about-data {
    display: flex;
    gap: 50px;
    margin-top: 40px;
    justify-content: center;
    text-align: center;
}

.about-data .data-item strong {
    display: block;
    font-size: 36px;
    color: #00994c;
}

.about-data .data-item p {
    text-indent: 0;
    font-size: 15px;
    color: #666;
}

/* 产品中心 */
.product-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.product-item {
    padding: 30px 20px;
    border: 1px solid #eee;
    border-radius: 10px;
    text-align: center;
    transition: 0.3s;
}

.product-item:hover {
    box-shadow: 0 5px 20px rgba(0,153,76,0.15);
    transform: translateY(-5px);
}

.product-item h3 {
    color: #00994c;
    margin-bottom: 15px;
    font-size: 18px;
}

.product-item p {
    color: #666;
    font-size: 14px;
}

/* 核心优势 */
.advantage {
    background: #f8fbf9;
}

.advantage-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.advantage-item {
    background: #fff;
    padding: 30px 20px;
    border-radius: 10px;
    text-align: center;
    transition: 0.3s;
}

.advantage-item:hover {
    box-shadow: 0 5px 20px rgba(0,153,76,0.15);
}

.advantage-item h3 {
    color: #00994c;
    margin-bottom: 15px;
}

.advantage-item p {
    color: #666;
    font-size: 14px;
}

/* 项目案例 */
.case-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.case-item {
    padding: 30px 20px;
    border: 1px solid #eee;
    border-radius: 10px;
    text-align: center;
    transition: 0.3s;
}

.case-item:hover {
    border-color: #00994c;
}

.case-item h3 {
    color: #333;
    margin-bottom: 15px;
}

.case-item p {
    color: #666;
    font-size: 14px;
}

/* 联系我们 */
.contact {
    background: #f8fbf9;
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info p {
    font-size: 16px;
    margin: 15px 0;
    color: #444;
}

/* 页脚 */
footer {
    background: #222;
    color: #aaa;
    text-align: center;
    padding: 30px 0;
    font-size: 14px;
}

/* 返回顶部 */
.back-top {
    width: 45px;
    height: 45px;
    background: #00994c;
    color: #fff;
    text-align: center;
    line-height: 45px;
    border-radius: 50%;
    position: fixed;
    bottom: 30px;
    right: 30px;
    cursor: pointer;
    display: none;
    z-index: 99;
}

.back-top.show {
    display: block;
}

/* 自适应适配 */
@media (max-width: 992px) {
    .product-list, .advantage-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .case-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
    .banner-text h1 {
        font-size: 32px;
    }
    .about-data {
        gap: 20px;
    }
    .section {
        padding: 50px 0;
    }
}

@media (max-width: 576px) {
    .product-list, .advantage-list, .case-list {
        grid-t