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

:root {
    --primary:#1677ff;
    --primary-dark:#0b5fd8;
    --light:#f0f7ff;
    --dark:#182335;
    --gray:#627183;
    --white:#ffffff;
    --body-bg:#f7f9fc;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 92%;
    max-width: 1320px;
    margin: 0 auto;
}

.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255,255,255,.95);
    box-shadow: 0 1px 12px rgba(0,0,0,0.08);
    z-index: 9999;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 78px;
}

.logo {
    font-size: 26px;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

    .logo i {
        font-size: 30px;
    }

.nav-menu {
    display: flex;
    list-style: none;
    gap: 42px;
}

    .nav-menu a {
        font-size: 16px;
        font-weight: 500;
        padding: 8px 0;
        position: relative;
        transition: .3s;
        color: var(--dark);
    }

        .nav-menu a:hover, .nav-menu a.active {
            color: var(--primary);
        }

            .nav-menu a.active::after {
                content: '';
                position: absolute;
                bottom: 0;
                left: 0;
                width: 100%;
                height: 3px;
                background: var(--primary);
                border-radius: 3px;
            }

.mobile-btn {
    display: none;
    font-size: 26px;
    cursor: pointer;
}

.page-banner {
    margin-top: 78px;
    width: 100%;
    height: 320px;
    background: linear-gradient(rgba(12,78,170,0.75),rgba(12,78,170,0.75)),url('https://picsum.photos/id/1039/1920/1080');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
}

    .page-banner h1 {
        font-size: 42px;
        margin-bottom: 12px;
    }

    .page-banner p {
        font-size: 18px;
        opacity: 0.92;
    }

.crumbs {
    padding: 18px 0;
    border-bottom: 1px solid #eee;
    font-size: 15px;
    color: var(--gray);
    background: #fff;
}

    .crumbs a {
        color: var(--primary);
    }

.pro-top {
    padding: 90px 0;
    background: #fff;
}

.pro-top-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 60px;
    align-items: flex-start;
}

.pro-img-box {
    width: 47%;
    min-width: 380px;
    flex-shrink: 0;
}

    .pro-img-box img {
        width: 100%;
        display: block;
        border-radius: 22px;
        box-shadow: 0 10px 42px #e2eaf8;
    }

.pro-info-box {
    flex: 1;
    min-width: 380px;
}

    .pro-info-box h2 {
        font-size: 36px;
        color: var(--dark);
        margin-bottom: 22px;
        font-weight: 600;
        line-height: 1.3;
    }

.pro-tag span {
    display: inline-block;
    padding: 7px 15px;
    background: var(--light);
    color: var(--primary);
    border-radius: 9px;
    margin-right: 10px;
    margin-bottom: 15px;
    font-size: 14px;
}

.pro-param {
    margin: 35px 0;
}

    .pro-param li {
        list-style: none;
        padding: 15px 0;
        border-bottom: 1px dashed #e5ebf3;
        color: var(--gray);
        font-size: 17px;
    }

        .pro-param li strong {
            color: var(--dark);
            min-width: 125px;
            display: inline-block;
        }

.pro-btn-group {
    margin-top: 45px;
    display: flex;
    gap: 26px;
    flex-wrap: wrap;
}

.btn-call {
    padding: 18px 42px;
    background: var(--primary);
    color: #fff;
    border-radius: 11px;
    font-size: 17px;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 6px 18px rgba(22,119,255,0.23);
}

    .btn-call:hover {
        background: var(--primary-dark);
    }

.btn-sample {
    padding: 18px 42px;
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 11px;
    font-size: 17px;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

    .btn-sample:hover {
        background: var(--light);
    }

.pro-tab {
    padding: 30px 0 90px;
    background: var(--body-bg);
}

.tab-nav {
    background: #fff;
    display: flex;
    border-radius: 18px;
    overflow: hidden;
    max-width: 1440px;
    margin: 0 auto 50px;
    box-shadow: 0 6px 26px #e4ecf8;
}

.tab-nav-item {
    flex: 1;
    text-align: center;
    padding: 24px 0;
    font-size: 19px;
    cursor: pointer;
    transition: .3s;
}

    .tab-nav-item.active {
        background: var(--primary);
        color: #fff;
    }

.tab-content {
    background: #fff;
    border-radius: 22px;
    padding: 52px;
    box-shadow: 0 7px 30px #e4ecf8;
}

.tab-pane {
    display: none;
}

    .tab-pane.active {
        display: block;
    }

.tab-content h3 {
    font-size: 28px;
    color: var(--dark);
    margin-bottom: 24px;
    padding-bottom: 15px;
    border-left: 6px solid var(--primary);
    padding-left: 18px;
}

.tab-content p {
    color: var(--gray);
    line-height: 1.9;
    font-size: 17px;
    margin-bottom: 20px;
    text-indent: 2em;
}

.tab-content span {
    font-size: 14px;
    padding: 3px 8px;
    background: #ffffff;
    color: dodgerblue;
    border-radius: 4px;
    margin-right: 6px;
    border: 1px solid dodgerblue;
}


.rel-pro {
    padding: 90px 0;
    background: #fff;
}

.sec-head {
    text-align: center;
    margin-bottom: 90px;
}

    .sec-head h2 {
        font-size: 40px;
        color: var(--dark);
        margin-bottom: 20px;
        position: relative;
        padding-bottom: 22px;
        font-weight: 600;
    }

        .sec-head h2::after {
            content: "";
            width: 86px;
            height: 4px;
            background: var(--primary);
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: 0;
            border-radius: 4px;
        }

    .sec-head p {
        max-width: 750px;
        margin: 0 auto;
        color: var(--gray);
        font-size: 17px;
        line-height: 1.8;
    }

.rel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(310px,1fr));
    gap: 44px;
}

.rel-card {
    border-radius: 20px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 7px 32px #e1e9f7;
    transition: .4s;
}

    .rel-card:hover {
        transform: translateY(-13px);
        box-shadow: 0 20px 50px #d0dceb;
    }

    .rel-card img {
        width: 100%;
        height: 240px;
        object-fit: cover;
        display: block;
    }

.rel-text {
    padding: 30px;
}

    .rel-text h4 {
        font-size: 20px;
        color: var(--dark);
        margin-bottom: 12px;
        font-weight: 500;
    }

    .rel-text p {
        font-size: 15px;
        color: var(--gray);
        line-height: 1.7;
    }

.footer {
    background: #121b2b;
    color: #b1b9c5;
    padding: 80px 0 32px;
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    gap: 45px;
    margin-bottom: 55px;
}

.footer-col {
    flex: 1;
    min-width: 245px;
}

    .footer-col h3 {
        color: #fff;
        font-size: 22px;
        margin-bottom: 30px;
        padding-bottom: 15px;
        border-bottom: 1px solid #2c3749;
    }

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

    .footer-col li {
        margin-bottom: 15px;
        font-size: 15px;
    }

    .footer-col a:hover {
        color: var(--primary);
    }

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid #2c3749;
}

/* 弹窗样式 */
#telMask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 999999;
    display: none;
    align-items: center;
    justify-content: center;
}

#telBox {
    background: #fff;
    width: 90%;
    max-width: 420px;
    border-radius: 24px;
    padding: 50px 35px;
    text-align: center;
}

.tel-icon {
    font-size: 50px;
    color: var(--primary);
    margin-bottom: 20px;
}

#telBox h3 {
    font-size: 26px;
    margin-bottom: 10px;
}

#telText {
    font-size: 32px;
    color: var(--primary);
    font-weight: bold;
    margin: 20px 0;
}

#closeTel {
    padding: 14px 35px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    cursor: pointer;
}

@media(max-width:992px) {
    .pro-top-wrap {
        flex-direction: column;
    }

    .pro-img-box, .pro-info-box {
        width: 100%;
    }
}

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

    .mobile-btn {
        display: block;
    }

    .page-banner {
        height: 290px;
    }

        .page-banner h1 {
            font-size: 34px;
        }

    .tab-nav-item {
        padding: 16px 4px;
        font-size: 15px;
    }

    .tab-content {
        padding: 32px 24px;
    }
}