:root {
    --navy: #0a1f3c;
    --navy-2: #0f2d55;
    --blue: #1565d8;
    --cyan: #19b5d8;
    --orange: #f59e0b;
    --text: #22303f;
    --muted: #6b7a8a;
    --bg-light: #f4f7fb;
    --white: #ffffff;
    --radius: 14px;
    --shadow: 0 8px 30px rgba(10,31,60,.10);
    --container: 1400px;
    --nav-h: 100px; /* 导航高度（移动端在媒体查询中覆盖） */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-h);
    -webkit-text-size-adjust: 100%
}

body {
    font-family: "PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    font-size: 16px;
}

    body.menu-open {
        overflow: hidden
    }
/* 移动端抽屉展开时锁定背景滚动 */
img {
    max-width: 100%;
    display: block
}

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

ul {
    list-style: none
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px
}

/* ---------- 顶部信息条 ---------- */
.topbar {
    background: var(--navy);
    color: #cfe0f5;
    font-size: 13px
}

    .topbar .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        min-height: 36px;
        gap: 10px;
        flex-wrap: wrap
    }

    .topbar a {
        color: #fff;
        margin-left: 14px
    }

@media(max-width:640px) {
    .topbar .hide-sm {
        display: none
    }
}

/* ---------- 导航 ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 12px rgba(10,31,60,.08)
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-h);
    gap: 12px
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0
}

.logo-mark {
    position: relative;
    width: 86px;
    height: 46px;
    border-radius: 10px;
    flex: none;
    overflow: hidden;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.logo-ph {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 1px;
    color: rgba(255,255,255,.95);
    user-select: none
}

.logo-mark img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    z-index: 2;
    background: #fff
}

.logo-text {
    min-width: 0
}

    .logo-text strong {
        display: block;
        font-size: 18px;
        color: var(--navy);
        letter-spacing: .5px;
        white-space: nowrap
    }

    .logo-text span {
        font-size: 14px;
        color: var(--muted);
        letter-spacing: .5px;
        white-space: nowrap
    }

@media(max-width:460px) {
    .logo-text strong {
        font-size: 14.5px;
        letter-spacing: 0
    }

    .logo-text span {
        font-size: 9.5px;
        letter-spacing: 0
    }

    .logo-mark {
        width: 60px;
        height: 40px
    }
}

@media(max-width:340px) {
    .logo-text span {
        display: none
    }
}

.menu {
    display: flex;
    gap: 6px
}

    .menu > li {
        position: relative
    }

        .menu > li > a {
            display: block;
            padding: 10px 16px;
            font-size: 16px;
            font-weight: 600;
            color: var(--navy);
            border-radius: 8px;
            transition: color .2s;
        }

            .menu > li > a:hover, .menu > li.active > a {
                color: var(--blue)
            }

                .menu > li.active > a::after {
                    content: "";
                    display: block;
                    height: 3px;
                    border-radius: 2px;
                    margin-top: 2px;
                    background: linear-gradient(90deg,var(--blue),var(--cyan));
                }

.dropdown {
    position: absolute;
    top: 120%;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: #fff;
    border-radius: 10px;
    box-shadow: var(--shadow);
    padding: 8px 0;
    min-width: 170px;
    opacity: 0;
    visibility: hidden;
    transition: all .25s;
    z-index: 99;
}

.menu > li:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0)
}

.dropdown a {
    display: block;
    padding: 9px 20px;
    font-size: 14px;
    color: var(--text)
}

    .dropdown a:hover {
        background: var(--bg-light);
        color: var(--blue)
    }

.nav-cta {
    background: linear-gradient(135deg,var(--blue),var(--cyan));
    color: #fff !important;
    padding: 10px 20px !important;
    border-radius: 24px;
    font-weight: 600
}

.burger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px
}

    .burger span {
        display: block;
        width: 24px;
        height: 2.5px;
        background: var(--navy);
        margin: 5px 0;
        border-radius: 2px;
        transition: .3s
    }

@media(max-width:960px) {
    :root {
        --nav-h: 68px
    }
    /* 移除 backdrop-filter：避免其成为 fixed 定位的包含块，同时提升移动端滚动性能 */
    .header {
        backdrop-filter: none;
        background: #fff
    }

    .menu {
        position: fixed;
        top: var(--nav-h);
        right: 0;
        width: 280px;
        max-width: 86vw;
        height: calc(100vh - var(--nav-h));
        height: calc(100dvh - var(--nav-h));
        background: #fff;
        flex-direction: column;
        padding: 12px 16px 24px;
        gap: 4px;
        box-shadow: -6px 0 24px rgba(0,0,0,.12);
        transform: translateX(100%);
        transition: transform .3s;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }

        .menu.open {
            transform: translateX(0)
        }

        .menu > li > a {
            padding: 14px 12px;
            border-bottom: 1px solid #eef2f7
        }
    /* 触摸端下拉改为点击展开（:hover 在手机上不可靠） */
    .dropdown {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        padding: 0 0 6px 16px;
        display: none;
        min-width: 0
    }

    .menu > li.sub-open .dropdown {
        display: block
    }

    .menu > li.has-sub > a::after {
        content: " ▾";
        font-size: 12px;
        color: var(--muted);
        display: inline-block;
        transition: transform .25s
    }

    .menu > li.sub-open > a::after {
        transform: rotate(180deg)
    }

    .burger {
        display: block
    }

    .nav-cta {
        display: none
    }
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    color: #fff;
    overflow: hidden;
    background: radial-gradient(900px 420px at 85% 20%,rgba(25,181,216,.35),transparent 60%), radial-gradient(700px 380px at 10% 90%,rgba(21,101,216,.45),transparent 60%), linear-gradient(135deg,#081a33 0%,#0c2a50 55%,#0a3a5c 100%);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.15fr .85fr;
    gap: 40px;
    align-items: center;
    padding: 88px 0 96px
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 30px;
    padding: 6px 18px;
    font-size: 14px;
    color: #bfe6f5;
    margin-bottom: 22px;
}

.hero h1 {
    font-size: clamp(30px,4.4vw,52px);
    line-height: 1.25;
    font-weight: 800;
    letter-spacing: 1px
}

    .hero h1 em {
        font-style: normal;
        background: linear-gradient(90deg,#4fc3f7,#19b5d8);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent
    }

.hero p.sub {
    margin: 20px 0 30px;
    font-size: clamp(15px,1.6vw,18px);
    color: #c9d9ec;
    max-width: 560px
}

.hero-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap
}

.btn {
    display: inline-block;
    padding: 13px 30px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    transition: .25s
}

.btn-primary {
    background: linear-gradient(135deg,var(--blue),var(--cyan));
    color: #fff;
    box-shadow: 0 8px 20px rgba(21,101,216,.4)
}

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 12px 26px rgba(21,101,216,.5)
    }

.btn-ghost {
    border: 1.5px solid rgba(255,255,255,.5);
    color: #fff
}

    .btn-ghost:hover {
        background: rgba(255,255,255,.12)
    }

.hero-visual {
    position: relative;
    min-height: 320px
}

    .hero-visual .ring {
        position: absolute;
        border-radius: 50%;
        border: 1px solid rgba(79,195,247,.35);
    }

    .hero-visual .r1 {
        width: 340px;
        height: 340px;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        animation: spin 24s linear infinite
    }

    .hero-visual .r2 {
        width: 250px;
        height: 250px;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        border-style: dashed;
        animation: spin 16s linear infinite reverse
    }

    .hero-visual .r3 {
        width: 160px;
        height: 160px;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        background: radial-gradient(circle at 35% 30%,rgba(79,195,247,.5),rgba(21,101,216,.15));
        box-shadow: 0 0 60px rgba(25,181,216,.5)
    }

    .hero-visual .core {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        font-size: 20px;
        font-weight: 700;
        letter-spacing: 4px;
        color: #fff;
        text-align: center;
    }

    .hero-visual .dot {
        position: absolute;
        width: 12px;
        height: 12px;
        border-radius: 50%;
        background: #4fc3f7;
        box-shadow: 0 0 12px #4fc3f7
    }

    .hero-visual .r1 .dot {
        top: -6px;
        left: 50%
    }

    .hero-visual .r2 .dot {
        bottom: 20px;
        right: 20px
    }

@keyframes spin {
    to {
        transform: translate(-50%,-50%) rotate(360deg)
    }
}

.hero-visual .tagchip {
    position: absolute;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.3);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 13px;
    backdrop-filter: blur(4px);
}

.hero-visual .tc1 {
    top: 8%;
    left: 4%
}

.hero-visual .tc2 {
    bottom: 10%;
    right: 2%
}

.hero-visual .tc3 {
    top: 52%;
    left: -4%
}

@media(max-width:900px) {
    .hero-inner {
        grid-template-columns: 1fr;
        padding: 60px 0 70px
    }

    .hero-visual {
        min-height: 280px;
        max-width: 420px;
        margin: 0 auto;
        width: 100%
    }
}

/* ---------- 数据条 ---------- */
.stats {
    background: var(--navy);
    color: #fff;
    padding: 34px 0
}

    .stats .container {
        display: grid;
        grid-template-columns: repeat(4,1fr);
        gap: 20px;
        text-align: center
    }

.stat b {
    font-size: clamp(26px,3vw,38px);
    font-weight: 800;
    color: #4fc3f7
}

.stat span {
    display: block;
    font-size: 14px;
    color: #a9bdd6;
    margin-top: 4px
}

@media(max-width:640px) {
    .stats .container {
        grid-template-columns: repeat(2,1fr)
    }
}

/* ---------- 产品分类切换 Banner ---------- */
.showcase {
    position: relative;
    overflow: hidden;
    background: linear-gradient(120deg,#0a1f3c,#1e2a96)
}

.sc-stage {
    position: relative;
    min-height: 600px
}

.sc-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity .45s ease;
}

    .sc-img.sc-fade {
        opacity: 0
    }
    /* 切换时淡出 */
    .sc-img.sc-hide {
        opacity: 0
    }
/* 图片缺失时隐藏，露出渐变底 */
.sc-veil {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,rgba(10,31,60,.02) 0%,rgba(26,34,120,.45) 42%,rgba(31,40,150,.88) 100%);
}

.sc-info {
    position: relative;
    z-index: 2;
    max-width: 620px;
    margin-left: auto;
    height: 100%;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    gap: 16px;
    text-align: right;
    color: #fff;
    padding: 64px 56px;
}

    .sc-info h3 {
        font-size: clamp(26px,3vw,40px);
        font-weight: 800;
        letter-spacing: 2px;
        transition: opacity .3s
    }

    .sc-info p {
        font-size: 15px;
        line-height: 1.9;
        color: #dde5ff;
        max-width: 480px;
        transition: opacity .3s
    }

    .sc-info .sc-fade {
        opacity: 0
    }

.sc-num {
    font-size: 15px;
    color: #c4d0ff;
    letter-spacing: 3px;
    margin-top: 8px
}

    .sc-num b {
        font-size: 24px;
        color: #fff;
        font-weight: 800
    }

.sc-tabs {
    position: relative;
    z-index: 3;
    display: flex;
    align-items: stretch;
    background: rgba(255,255,255,.14);
    backdrop-filter: blur(6px);
}

.ptab {
    flex: 1;
    padding: 21px 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: rgba(255,255,255,.92);
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    white-space: nowrap;
    transition: background .25s,color .25s;
    border-right: 1px solid rgba(255,255,255,.18);
}

    .ptab:last-of-type {
        border-right: none
    }

    .ptab:hover {
        background: rgba(255,255,255,.14)
    }

    .ptab.active {
        background: #fff;
        color: #1533a0
    }

    .ptab:focus-visible {
        outline: 2px solid #4fc3f7;
        outline-offset: -2px
    }

.sc-more {
    flex: none;
    display: flex;
    align-items: center;
    gap: 16px;
    background: #fff;
    color: #1533a0;
    padding: 0 36px;
    font-size: 15px;
    font-weight: 700;
    transition: background .25s;
}

    .sc-more:hover {
        background: #e8efff
    }

    .sc-more .arr {
        display: inline-block;
        transition: transform .25s
    }

    .sc-more:hover .arr {
        transform: translateX(6px)
    }

@media(max-width:1100px) {
    .ptab {
        padding: 18px 6px;
        font-size: 14px
    }

    .sc-more {
        padding: 0 22px;
        gap: 10px
    }
}

@media(max-width:900px) {
    .sc-stage {
        min-height: 440px
    }

    .sc-info {
        min-height: 440px;
        padding: 48px 32px
    }
}

@media(max-width:820px) {
    /* 移动端：图片在上、文字压图下沿，标签横向滑动 */
    .sc-stage {
        min-height: 380px
    }

    .sc-info {
        min-height: 380px;
        max-width: 100%;
        align-items: flex-start;
        text-align: left;
        padding: 190px 20px 34px;
        justify-content: flex-end
    }

        .sc-info p {
            max-width: 100%;
            font-size: 14px
        }

    .sc-veil {
        background: linear-gradient(180deg,rgba(10,31,60,.05) 0%,rgba(24,34,125,.45) 45%,rgba(22,32,130,.92) 100%)
    }

    .sc-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none
    }

        .sc-tabs::-webkit-scrollbar {
            display: none
        }

    .ptab {
        flex: none;
        padding: 14px 16px;
        font-size: 14px
    }

    .sc-more {
        padding: 0 18px
    }
}

/* ---------- 通用 Section ---------- */
section.block {
    padding: 80px 0
}

section.block1 {
    padding: 80px 0 0 0;
}

section.block.alt {
    background: var(--bg-light)
}

.sec-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 48px
}

    .sec-head .en {
        font-size: 13px;
        letter-spacing: 3px;
        color: var(--cyan);
        text-transform: uppercase;
        font-weight: 700
    }

    .sec-head h2 {
        font-size: clamp(24px,3vw,34px);
        color: var(--navy);
        margin: 8px 0 12px;
        font-weight: 800
    }

    .sec-head p {
        color: var(--muted);
        font-size: 15px
    }

/* ---------- 关于我们 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 44px;
    align-items: center
}

.about-text h3 {
    font-size: 22px;
    color: var(--navy);
    margin-bottom: 14px
}

.about-text p {
    color: #4a5866;
    margin-bottom: 12px
}

.about-points {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 20px
}

    .about-points li {
        background: #fff;
        border-left: 4px solid var(--cyan);
        border-radius: 8px;
        padding: 12px 14px;
        font-size: 14px;
        font-weight: 600;
        color: var(--navy);
        box-shadow: 0 3px 12px rgba(10,31,60,.06)
    }
/* 公司形象图占位：图片加载后自动覆盖占位内容（img 为 absolute 顶层，onerror 时占位仍在 DOM 中） */
.about-media {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    min-height: 340px;
    background: radial-gradient(420px 220px at 80% 15%,rgba(25,181,216,.45),transparent 65%), linear-gradient(135deg,#0a3a6b,#1273c4);
    display: flex;
    align-items: center;
    justify-content: center;
}

    .about-media img {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 2
    }

.about-ph {
    text-align: center;
    color: rgba(255,255,255,.92);
    user-select: none;
    line-height: 1.6;
    padding: 20px
}

    .about-ph .ico {
        font-size: 42px;
        display: block;
        margin-bottom: 8px;
        opacity: .9
    }

    .about-ph b {
        font-size: 17px;
        letter-spacing: 2px;
        display: block
    }

    .about-ph small {
        font-size: 11px;
        opacity: .75;
        display: block;
        margin-top: 4px
    }

.about-badge {
    position: absolute;
    left: 16px;
    bottom: 16px;
    z-index: 3;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(6px);
    border-radius: 10px;
    padding: 10px 18px;
    box-shadow: 0 6px 18px rgba(10,31,60,.25);
}

    .about-badge b {
        display: block;
        font-size: 18px;
        font-weight: 800;
        color: var(--blue);
        line-height: 1.3
    }

    .about-badge span {
        font-size: 12px;
        color: var(--muted)
    }

@media(max-width:900px) {
    .about-grid {
        grid-template-columns: 1fr
    }
}

@media(max-width:520px) {
    .about-points {
        grid-template-columns: 1fr
    }
}

/* ---------- 产业链流程 ---------- */
.chain {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 0;
    counter-reset: chain
}

.chain-item {
    position: relative;
    text-align: center;
    padding: 0 14px
}

    .chain-item .ico {
        width: 74px;
        height: 74px;
        margin: 0 auto 14px;
        border-radius: 50%;
        background: linear-gradient(135deg,var(--blue),var(--cyan));
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 30px;
        box-shadow: 0 8px 20px rgba(21,101,216,.3);
        position: relative;
        z-index: 2;
    }

    .chain-item::after {
        content: "";
        position: absolute;
        top: 37px;
        left: calc(50% + 50px);
        right: calc(-50% + 50px);
        height: 2px;
        background: repeating-linear-gradient(90deg,var(--cyan) 0 8px,transparent 8px 16px);
    }

    .chain-item:last-child::after {
        display: none
    }

    .chain-item h4 {
        color: var(--navy);
        font-size: 17px;
        margin-bottom: 6px
    }

    .chain-item p {
        font-size: 13px;
        color: var(--muted)
    }

@media(max-width:760px) {
    .chain {
        grid-template-columns: 1fr 1fr;
        gap: 30px 0
    }

    .chain-item:nth-child(2)::after {
        display: none
    }
}

@media(max-width:420px) {
    .chain {
        grid-template-columns: 1fr
    }

    .chain-item::after {
        display: none
    }
}

/* ---------- 产品 ---------- */
.prod-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 24px
}

.pcard {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 4px 18px rgba(10,31,60,.08);
    transition: .3s;
    display: flex;
    flex-direction: column;
}

    .pcard:hover {
        transform: translateY(-6px);
        box-shadow: 0 14px 34px rgba(10,31,60,.16)
    }

    .pcard .thumb {
        position: relative;
        height: 300px;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }
        /* 图片占位：图片加载后自动覆盖占位内容（img 为 absolute 顶层，onerror 时占位仍在 DOM 中） */
        .pcard .thumb .ph {
            text-align: center;
            color: rgba(255,255,255,.9);
            user-select: none;
            line-height: 1.5;
        }

            .pcard .thumb .ph .ico {
                font-size: 30px;
                display: block;
                margin-bottom: 4px;
                opacity: .9
            }

            .pcard .thumb .ph b {
                font-size: 15px;
                letter-spacing: 1px;
                display: block
            }

            .pcard .thumb .ph small {
                font-size: 10.5px;
                opacity: .75;
                display: block;
                margin-top: 2px
            }

        .pcard .thumb img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 2;
            transition: transform .45s ease;
        }

    .pcard:hover .thumb img {
        transform: scale(1.06)
    }
    /* 占位底色（图片就位后被覆盖） */
    .pcard .t1 {
        background: linear-gradient(135deg,#1558a8,#2196f3)
    }

    .pcard .t2 {
        background: linear-gradient(135deg,#0d7fa5,#19b5d8)
    }

    .pcard .t3 {
        background: linear-gradient(135deg,#0a4d8c,#1273c4)
    }

    .pcard .t4 {
        background: linear-gradient(135deg,#1b9c85,#2fc9a8)
    }

    .pcard .t5 {
        background: linear-gradient(135deg,#8a5a12,var(--orange))
    }

    .pcard .t6 {
        background: linear-gradient(135deg,#5b3fa8,#8e6ce0)
    }

    .pcard .body {
        padding: 20px 22px 24px;
        flex: 1;
        display: flex;
        flex-direction: column
    }

    .pcard h3 {
        font-size: 18px;
        color: var(--navy);
        margin-bottom: 8px
    }

    .pcard p {
        font-size: 14px;
        color: var(--muted);
        flex: 1
    }

    .pcard .links {
        margin-top: 14px;
        display: flex;
        gap: 8px;
        flex-wrap: wrap
    }

        .pcard .links a {
            font-size: 12.5px;
            color: var(--blue);
            background: #eaf3fd;
            border-radius: 20px;
            padding: 4px 12px;
        }

@media(max-width:900px) {
    .prod-grid {
        grid-template-columns: 1fr 1fr
    }
}

@media(max-width:560px) {
    .prod-grid {
        grid-template-columns: 1fr
    }
}

/* ---------- 重点产品（图 + 蓝色介绍面板，左右交替） ---------- */
.keypro {
    display: flex;
    flex-direction: column;
    gap: 26px
}

.kp {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 6px 24px rgba(10,31,60,.12);
}

.kp-img {
    position: relative;
    min-height: 300px;
    overflow: hidden;
    background: linear-gradient(135deg,#1558a8,#2196f3);
    display: flex;
    align-items: center;
    justify-content: center;
}
    /* 图片占位：图片加载后自动覆盖占位内容（img 为 absolute 顶层，onerror 时占位仍在 DOM 中） */
    .kp-img .ph {
        text-align: center;
        color: rgba(255,255,255,.92);
        user-select: none;
        line-height: 1.5
    }

        .kp-img .ph .ico {
            font-size: 34px;
            display: block;
            margin-bottom: 4px;
            opacity: .9
        }

        .kp-img .ph b {
            font-size: 15px;
            letter-spacing: 1px;
            display: block
        }

        .kp-img .ph small {
            font-size: 10.5px;
            opacity: .75;
            display: block;
            margin-top: 2px
        }

    .kp-img img {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 2;
        transition: transform .5s ease;
    }

.kp:hover .kp-img img {
    transform: scale(1.05)
}

.kp-panel {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: linear-gradient(135deg,#1e46c8,#3a63e8);
    padding: 48px 44px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 14px;
}

    .kp-panel h3 {
        font-size: clamp(20px,2vw,26px);
        font-weight: 800;
        letter-spacing: 2px
    }

    .kp-panel p {
        font-size: 14.5px;
        line-height: 1.95;
        color: #e0e7ff;
        max-width: 520px
    }

    .kp-panel .more {
        align-self: flex-start;
        margin-top: 4px;
        font-size: 14px;
        font-weight: 700;
        color: #fff;
        border-bottom: 2px solid rgba(255,255,255,.55);
        padding-bottom: 2px;
        transition: border-color .25s;
    }

        .kp-panel .more:hover {
            border-color: #fff
        }

        .kp-panel .more .arr {
            display: inline-block;
            transition: transform .25s
        }

        .kp-panel .more:hover .arr {
            transform: translateX(5px)
        }

.kp-mark {
    position: absolute;
    right: 18px;
    bottom: -14px;
    font-size: 130px;
    line-height: 1;
    opacity: .13;
    user-select: none;
    pointer-events: none;
    display: none;
}

.kp.rev .kp-img {
    order: 2
}

.kp.rev .kp-panel {
    order: 1
}

@media(max-width:820px) {
    .kp {
        grid-template-columns: 1fr
    }
        /* 手机端固定图片在上、文字在下（不跟随桌面翻转） */
        .kp .kp-img, .kp.rev .kp-img {
            order: 0;
            min-height: 230px;
            height: auto;
            aspect-ratio: 16/10
        }

        .kp .kp-panel, .kp.rev .kp-panel {
            order: 1;
            padding: 30px 22px
        }

    .kp-mark {
        font-size: 96px
    }
}

/* ---------- 应用领域 ---------- */
.app-grid {
    display: grid;
    grid-template-columns: repeat(5,1fr);
    gap: 18px
}

.app {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    text-align: center;
    box-shadow: 0 4px 16px rgba(10,31,60,.07);
    transition: .3s;
    border-top: 3px solid transparent;
}

    .app:hover {
        border-top-color: var(--cyan);
        transform: translateY(-5px)
    }
    /* 行业图片占位：图片加载后自动覆盖占位内容（img 为 absolute 顶层，onerror 时占位仍在 DOM 中） */
    .app .app-thumb {
        position: relative;
        height: 150px;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }

        .app .app-thumb .ph {
            text-align: center;
            color: rgba(255,255,255,.92);
            user-select: none;
            line-height: 1.45
        }

            .app .app-thumb .ph .ico {
                font-size: 24px;
                display: block;
                margin-bottom: 2px;
                opacity: .9
            }

            .app .app-thumb .ph b {
                font-size: 13.5px;
                letter-spacing: 1px;
                display: block
            }

            .app .app-thumb .ph small {
                font-size: 10px;
                opacity: .75;
                display: block;
                margin-top: 2px
            }

        .app .app-thumb img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .45s ease
        }

    .app:hover .app-thumb img {
        transform: scale(1.07)
    }
    /* 占位底色（图片就位后被覆盖） */
    .app .a1 {
        background: linear-gradient(135deg,#0a6ea8,#18a8d8)
    }

    .app .a2 {
        background: linear-gradient(135deg,#1b9c85,#2fc9a8)
    }

    .app .a3 {
        background: linear-gradient(135deg,#1558a8,#2196f3)
    }

    .app .a4 {
        background: linear-gradient(135deg,#8a5a12,var(--orange))
    }

    .app .a5 {
        background: linear-gradient(135deg,#5b3fa8,#8e6ce0)
    }

    .app h4 {
        font-size: 16px;
        color: var(--navy);
        margin: 16px 14px 6px
    }

    .app p {
        font-size: 13px;
        color: var(--muted);
        margin: 0 14px;
        padding-bottom: 22px
    }

@media(max-width:1000px) {
    .app-grid {
        grid-template-columns: repeat(3,1fr)
    }
}

@media(max-width:560px) {
    .app-grid {
        grid-template-columns: repeat(2,1fr)
    }
}

/* ---------- 优势 ---------- */
.adv-wrap {
    display: grid;
    grid-template-columns: repeat(5,1fr);
    gap: 22px
}

@media(max-width:1200px) {
    .adv-wrap {
        grid-template-columns: repeat(3,1fr)
    }
}

.adv {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px 22px;
    box-shadow: 0 4px 16px rgba(10,31,60,.07);
    position: relative;
    overflow: hidden;
}

    .adv::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: linear-gradient(90deg,var(--blue),var(--cyan))
    }

    .adv .num {
        font-size: 13px;
        font-weight: 800;
        color: var(--cyan);
        letter-spacing: 2px
    }

    .adv h4 {
        font-size: 17px;
        color: var(--navy);
        margin: 6px 0 8px
    }

    .adv p {
        font-size: 13.5px;
        color: var(--muted)
    }

@media(max-width:900px) {
    .adv-wrap {
        grid-template-columns: 1fr 1fr
    }
}

@media(max-width:520px) {
    .adv-wrap {
        grid-template-columns: 1fr
    }
}

/* ---------- 新闻 ---------- */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 24px
}

.ncard {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(10,31,60,.07);
    transition: .3s
}

    .ncard:hover {
        transform: translateY(-5px)
    }

    .ncard .cat {
        margin: 18px 20px 0;
        display: inline-block;
        font-size: 12px;
        color: var(--blue);
        background: #eaf3fd;
        border-radius: 4px;
        padding: 3px 10px;
        font-weight: 600;
    }

    .ncard h4 {
        font-size: 16px;
        color: var(--navy);
        margin: 10px 20px 8px;
        line-height: 1.5
    }

    .ncard p {
        font-size: 13.5px;
        color: var(--muted);
        margin: 0 20px
    }

    .ncard .date {
        display: block;
        font-size: 12.5px;
        color: #9aa8b5;
        margin: 12px 20px 20px
    }

    .ncard .readmore {
        color: var(--blue);
        font-weight: 700
    }

    .ncard:hover .readmore {
        text-decoration: underline
    }

@media(max-width:820px) {
    .news-grid {
        grid-template-columns: 1fr
    }
}

.news-more {
    text-align: center;
    margin-top: 34px
}

/* ---------- 联系我们 ---------- */
.contact {
    background: linear-gradient(135deg,#081a33,#0c2a50);
    color: #fff
}

    .contact .sec-head h2 {
        color: #fff
    }

    .contact .sec-head p {
        color: #a9bdd6
    }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start
}

.cinfo li {
    display: flex;
    gap: 14px;
    margin-bottom: 22px;
    align-items: flex-start
}

.cinfo .ico {
    width: 46px;
    height: 46px;
    flex: none;
    border-radius: 10px;
    background: rgba(79,195,247,.15);
    border: 1px solid rgba(79,195,247,.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.cinfo b {
    display: block;
    font-size: 15px;
    color: #4fc3f7;
    margin-bottom: 2px
}

.cinfo span {
    font-size: 15px;
    color: #e2ecf7;
    word-break: break-word
}

.cinfo a:hover {
    text-decoration: underline
}

/* 微信二维码 */
.qr-wrap {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 6px;
    padding: 20px;
    border-radius: var(--radius);
    background: rgba(79,195,247,.08);
    border: 1px solid rgba(79,195,247,.28);
}

.qr-box {
    position: relative;
    width: 132px;
    height: 132px;
    flex: none;
    background: #fff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

    .qr-box img {
        position: absolute;
        top: 6px;
        left: 6px;
        width: calc(100% - 12px);
        height: calc(100% - 12px);
        object-fit: contain;
        background: #fff;
        z-index: 2;
    }

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    width: 100%;
    height: 100%;
    color: #8ba3bf;
    text-align: center;
    user-select: none;
}

    .qr-placeholder .qrp-ico {
        font-size: 38px;
        line-height: 1;
        color: #c3d3e4
    }

    .qr-placeholder em {
        font-style: normal;
        font-size: 12.5px;
        color: #5f7691;
        font-weight: 600
    }

    .qr-placeholder small {
        font-size: 10.5px;
        color: #96a9bd;
        padding: 0 6px;
        line-height: 1.3
    }

.qr-text {
    flex: 1;
    min-width: 180px
}

    .qr-text b {
        display: block;
        font-size: 16px;
        color: #4fc3f7;
        margin-bottom: 6px
    }

    .qr-text p {
        font-size: 13.5px;
        color: #c9d9ec;
        margin-bottom: 6px
    }

    .qr-text span {
        font-size: 12.5px;
        color: #8ba3bf
    }

@media(max-width:420px) {
    .qr-box {
        width: 112px;
        height: 112px
    }

    .qr-wrap {
        padding: 16px;
        gap: 14px
    }
}

.cform {
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.14);
    border-radius: var(--radius);
    padding: 28px
}

    .cform h3 {
        margin-bottom: 16px;
        font-size: 18px
    }

    .cform .row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 14px
    }

    .cform input, .cform textarea {
        width: 100%;
        background: rgba(255,255,255,.08);
        border: 1px solid rgba(255,255,255,.2);
        border-radius: 8px;
        padding: 12px 14px;
        color: #fff;
        font-size: 14px;
        margin-bottom: 14px;
        font-family: inherit;
    }

        .cform input::placeholder, .cform textarea::placeholder {
            color: #8ba3bf
        }

        .cform input:focus, .cform textarea:focus {
            outline: none;
            border-color: #4fc3f7
        }

    .cform button {
        width: 100%;
        padding: 13px;
        border: none;
        border-radius: 26px;
        cursor: pointer;
        background: linear-gradient(135deg,var(--blue),var(--cyan));
        color: #fff;
        font-size: 16px;
        font-weight: 700;
    }

.captcha-row {
    display: grid;
    grid-template-columns: 1fr 132px;
    gap: 14px;
    margin-bottom: 14px;
    width: 50%;
}

    .captcha-row input {
        margin-bottom: 0
    }

.cap-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    border: 1px dashed rgba(79,195,247,.55);
    border-radius: 8px;
    color: #bfe6f9;
    font-size: 14px;
    font-weight: normal;
    letter-spacing: 2px;
    background: repeating-linear-gradient(-45deg,rgba(79,195,247,.16) 0 9px,rgba(79,195,247,.05) 9px 18px);
    transition: border-color .2s;
    padding: 3px 0;
}

    .cap-box:hover, .cap-box:focus-visible {
        border-color: #4fc3f7;
        outline: none
    }

    .cap-box .cap-ref {
        font-size: 13px;
        font-weight: 400;
        opacity: .7
    }
@media(max-width:820px) {
    .contact-grid {
        grid-template-columns: 1fr
    }

    .cform .row {
        grid-template-columns: 1fr
    }
}

/* ---------- 页脚 ---------- */
.footer {
    background: #071527;
    color: #8ba3bf;
    font-size: 14px
}

    .footer .container {
        padding: 48px 20px 24px
    }

.foot-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px
}

    .foot-grid h5 {
        color: #fff;
        font-size: 15px;
        margin-bottom: 14px
    }

    .foot-grid li {
        margin-bottom: 9px
    }

    .foot-grid a:hover {
        color: #4fc3f7
    }

.foot-brand strong {
    color: #fff;
    font-size: 18px;
    display: block;
    margin-bottom: 8px
}

.foot-contact {
    margin-top: 14px;
    font-size: 13.5px
}

    .foot-contact li {
        margin-bottom: 8px;
        line-height: 1.6;
        word-break: break-word
    }

    .foot-contact a:hover {
        color: #4fc3f7
    }

.foot-map {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    font-size: 13px;
    color: #4fc3f7
}

    .foot-map:hover {
        text-decoration: underline
    }

.copyright {
    border-top: 1px solid rgba(255,255,255,.1);
    padding-top: 20px;
    text-align: center;
    font-size: 13px
}

@media(max-width:820px) {
    .foot-grid {
        grid-template-columns: 1fr 1fr;
        gap: 26px
    }
}

@media(max-width:480px) {
    .foot-grid {
        grid-template-columns: 1fr
    }
}

/* ---------- 响应式细节补充 ---------- */
/* 平板：压缩区块留白 */
@media(max-width:900px) {
    section.block {
        padding: 64px 0
    }

    .hero-inner {
        padding: 56px 0 64px
    }

    .sec-head {
        margin-bottom: 36px
    }

    .about-media {
        min-height: 0;
        aspect-ratio: 16/10
    }

    .about-grid {
        gap: 32px
    }
}
/* 手机横屏/大屏手机 */
@media(max-width:640px) {
    .stat b {
        font-size: clamp(24px,7vw,32px)
    }

    .pcard .thumb {
        height: 240px
    }

    .app .app-thumb {
        height: 136px
    }

    .cinfo li {
        margin-bottom: 18px
    }
}
/* 手机竖屏：进一步压缩尺寸，保证不横向溢出 */
@media(max-width:480px) {
    .container {
        padding: 0 16px
    }

    section.block {
        padding: 52px 0
    }

    .sec-head {
        margin-bottom: 28px
    }

    .hero-inner {
        padding: 44px 0 52px
    }

    .btn {
        padding: 12px 24px;
        font-size: 15px
    }

    .hero-btns {
        gap: 10px
    }
    /* Hero 视觉环按屏幕缩放，避免小屏被裁切 */
    .hero-visual {
        min-height: 230px
    }

        .hero-visual .r1 {
            width: 250px;
            height: 250px
        }

        .hero-visual .r2 {
            width: 184px;
            height: 184px
        }

        .hero-visual .r3 {
            width: 118px;
            height: 118px
        }

        .hero-visual .core {
            font-size: 15px;
            letter-spacing: 2px
        }

        .hero-visual .tagchip {
            font-size: 11px;
            padding: 5px 10px
        }

        .hero-visual .tc1 {
            top: 2%;
            left: 0
        }

        .hero-visual .tc3 {
            top: 54%;
            left: 0
        }

        .hero-visual .tc2 {
            right: 0;
            bottom: 6%
        }
    /* 产业链图标缩小，连接线同步上移 */
    .chain-item .ico {
        width: 60px;
        height: 60px;
        font-size: 25px;
        margin-bottom: 10px
    }

    .chain-item::after {
        top: 30px
    }

    .chain-item h4 {
        font-size: 16px
    }
    /* 产品 / 行业图改为按比例高度，避免小屏卡片过高 */
    .pcard .thumb {
        height: auto;
        aspect-ratio: 4/3
    }

    .app .app-thumb {
        height: auto;
        aspect-ratio: 16/10
    }

    .adv {
        padding: 22px 18px
    }

    .ncard h4, .ncard p {
        margin-left: 16px;
        margin-right: 16px
    }

    .ncard .cat {
        margin-left: 16px
    }

    .ncard .date {
        margin-left: 16px
    }

    .cform {
        padding: 20px
    }
        /* 输入框 ≥16px 可避免 iOS Safari 聚焦时自动放大页面 */
        .cform input, .cform textarea {
            font-size: 16px
        }

    .qr-box {
        width: 112px;
        height: 112px
    }
}
/* 超小屏兜底 */
@media(max-width:360px) {
    .topbar {
        font-size: 12px
    }

    .menu {
        width: 100%;
        max-width: 100vw
    }

    .qr-text {
        min-width: 0
    }
}

/* ---------- 返回顶部 ---------- */
.backtop {
    position: fixed;
    right: 20px;
    bottom: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg,var(--blue),var(--cyan));
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 18px;
    box-shadow: 0 6px 18px rgba(21,101,216,.4);
    opacity: 0;
    visibility: hidden;
    transition: .3s;
    z-index: 99;
}

    .backtop.show {
        opacity: 1;
        visibility: visible
    }

/* 中等宽度（961–1150）：压缩导航，避免长公司名把菜单挤到换行 */
@media(min-width:961px) and (max-width:1150px) {
    .logo-text strong {
        font-size: 16px
    }

    .logo-text span {
        font-size: 12px
    }

    .menu > li > a {
        padding: 10px 10px;
        font-size: 14.5px
    }

    .nav-cta {
        padding: 9px 14px !important;
        font-size: 14px
    }
}