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

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.8;
}

img {
    max-width: 100%;
}

/* 容器统一样式 */
.container {
    width: 1200px;
    margin: 0 auto;
    background: #fff;
    overflow: hidden;
}

/* 导航菜单 锚点导航 */
.nav {
    background: #004793;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav li {
    list-style: none;
}

.nav a {
    display: inline-block;
    color: #fff;
    font-size: 16px;
    padding: 15px 25px;
    text-decoration: none;
    transition: 0.3s;
}

.nav a:hover {
    background: #e63946;
}

.friend-links a {
    color: #ffffff;
    text-decoration: none;
    margin: 0 10px;
}

.friend-links .section-title {
    text-align: center;
    color: #ffffff;
    margin-top: 0;
}

/* 顶部Banner */
.top-banner {
    width: 100%;
    height: 320px;
    background: #004793;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-align: center;
    padding: 0 20px;
}

.top-banner h1 {
    font-size: 48px;
    margin-bottom: 15px;
    letter-spacing: 4px;
}

.top-banner .sub-title {
    font-size: 22px;
    margin-bottom: 25px;
    opacity: 0.95;
}

.top-banner .tag-line {
    font-size: 18px;
    background: #e63946;
    padding: 8px 20px;
    border-radius: 4px;
}

/* 通用板块标题 + 锚点ID对应 */
.section-title {
    text-align: center;
    font-size: 28px;
    color: #004793;
    margin: 30px 0 30px;
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 80px;
    height: 3px;
    background: #e63946;
    margin: 10px auto 0;
}

/* 企业简介 */
.about-box {
    padding: 0 60px 40px;
    font-size: 16px;
}

.about-box p {
    margin-bottom: 18px;
}

.about-box .img_box {
    text-align: center;
}

.about-box .contact-tip {
    font-size: 18px;
    color: #e63946;
    font-weight: bold;
    text-align: center;
    text-indent: 0;
    margin: 20px 0;
}

.idea {
    text-align: center;
    font-size: 17px;
    color: #004793;
    font-weight: 600;
    margin: 20px 0;
}

/* 核心优势 四列布局 */
.advantage-wrap {
    display: flex;
    padding: 0 40px 40px;
    gap: 20px;
}

.advantage-item {
    flex: 1;
    border: 1px solid #eee;
    padding: 25px 15px;
    text-align: center;
    transition: 0.3s;
}

.advantage-item:hover {
    border-color: #004793;
    box-shadow: 0 0 10px #ddd;
}

.advantage-item h3 {
    color: #004793;
    font-size: 20px;
    margin-bottom: 15px;
}

.advantage-item p {
    font-size: 15px;
    color: #555;
}

/* 产品系列 - 带图片布局 */
.product-wrap {
    padding: 0 40px 40px;
}

.product-group {
    margin-bottom: 40px;
}

.product-group h4 {
    color: #004793;
    font-size: 20px;
    margin-bottom: 20px;
    padding-bottom: 8px;
    border-bottom: 1px dashed #ccc;
}

.product-list {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
}

.product-item {
    width: 23.3%;
    border: 1px solid #eee;
    padding: 15px;
    text-align: center;
    transition: 0.3s;
}

.product-item:hover {
    box-shadow: 0 0 8px #ddd;
    border-color: #004793;
}

.product-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    margin-bottom: 12px;
    background: #f8f8f8;
}

.product-item p {
    font-size: 14px;
    color: #444;
}

.client-box,
.service-box,
.application-box {
    padding: 0 40px;
}

/* 企业实力 */
.power-box {
    padding: 0 60px 40px;
    font-size: 16px;
}

.power-box ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 15px 40px;
    justify-content: center;
}

.power-box li {
    background: #f0f5fc;
    padding: 10px 20px;
    border-radius: 3px;
    color: #004793;
}

/* 底部联系栏 */
.footer {
    background: #004793;
    color: #fff;
    padding: 30px 15px;
    text-align: center;
    margin-top: 30px;
}

.footer p {
    font-size: 17px;
    margin: 10px 0;
}

.footer .hotline {
    font-size: 22px;
    color: #ffd700;
    font-weight: bold;
    margin: 15px 0;
}

.footer .copyright {
    margin-top: 15px;
    font-size: 14px;
    opacity: 0.8;
}

/* 响应式适配 手机/平板 */
@media (max-width: 1200px) {
    .container {
        width: 100%;
    }

    .product-item {
        width: 31.5%;
    }

    .product-item img {
        height: 200px;
    }

    .product-list {
        gap: 0;
    }

}

@media (max-width: 995px) {
    .product-item {
        width: 48%;
        margin-bottom: 25px;
    }

    .product-list {
        justify-content: space-between;
    }

}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .nav a {
        padding: 12px 10px;
        font-size: 14px;
    }

    .section-title {
        font-size: 22px;
    }

    .top-banner .tag-line {
        font-size: 16px;
    }

    .top-banner h1 {
        font-size: 30px;
    }

    .product-wrap {
        padding: 0 20px;
    }

    .client-box,
    .service-box,
    .application-box {
        padding: 0 20px;
    }

    .top-banner .sub-title {
        font-size: 16px;
    }

    .advantage-wrap {
        flex-direction: column;
        padding: 20px;
    }

    .about-box,
    .power-box {
        padding: 0 20px;
    }

    .product-list .product-item {
        width: 48%;
    }

    .product-list .product-item img {
        height: 220px;
    }
}

@media (max-width: 468px) {
    .product-list .product-item{
        width: 100%;
    }
}




.tel {
    font-size: 22px;
    color: #ffd700;
    font-weight: bold;
    margin: 15px 0;
    text-decoration: none;
}

/* 移动端浮动电话按钮 */
.float-call {
    position: fixed;
    right: 20px;
    bottom: 30px;
    z-index: 999;

}

.float-call a {
    display: block;
    width: 60px;
    height: 60px;
    line-height: 60px;
    background: #e63946;
    color: #fff;
    font-size: 28px;
    text-align: center;
    border-radius: 50%;
    text-decoration: none;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
    animation: callPulse 2s infinite;
}