/* =====================================================
   responsive.css — 全站响应式媒体查询（独立文件）
   -----------------------------------------------------
   从主 CSS 中抽离的所有 @media 规则，统一维护。
   引入方式（必须在主 CSS 之后加载）：
   <link rel="stylesheet" href="main.css">
   <link rel="stylesheet" href="responsive.css">

   断点体系（桌面优先，从大到小）：
   min:1920 / min:1824 / 1600 / 1440 / 1400 / 1280 /
   1200 / 1199 / 1024 / 991 / 768 / 767 / 480

   已修复问题（详见提交说明）：
   1. 删除 1440/1024/768/480 下 html 固定 px 根字号
      （与 5.2083vw 流式基准冲突，且数值错误）；
   2. header 的 min-width:1024 与 max-width:1024 在
      1024px 处重叠，min 侧改为 1025px；
   3. section1 的 max-width:992 统一为 991，与全站
      平板断点（991px）对齐；
   4. hero-section4 的 min-width:1921 统一为 1920。
===================================================== */


/* =====================================================
   ≥ 1920px 大屏
===================================================== */

@media screen and (min-width: 1920px) {

    /* rem 基准封顶：1920 设计稿 1rem = 100px */
    /* html {
        font-size: 100px;
    } */

    /* hero-section4 产品图文详情 */
    .hero-section4 .item .img {
        height: 5.72rem;
    }

    .hero-section4 .item .txt {
        min-height: 5.72rem;
        padding: 0.65rem 0.7rem;
    }
}


/* =====================================================
   ≥ 1824px 宽容器
===================================================== */

@media screen and (min-width: 1824px) {
    .max1710 {
        width: 100%;
        padding-left: 100px;
        padding-right: 100px;
        max-width: 100%;
    }
}


/* =====================================================
   ≤ 1600px 普通电脑
===================================================== */

@media screen and (max-width: 1600px) {

    /* hero-section4 产品图文详情 */
    .hero-section4 .item .img {
        height: 500px;
    }

    .hero-section4 .item .txt {
        min-height: 500px;
        padding: 55px 65px 48px;
    }

    .hero-section4 .item .txt .tx1 {
        font-size: 26px;
    }

    .hero-section4 .item .txt .tx2 {
        max-width: none;
        font-size: 17px;
        line-height: 2.1;
    }

    /* video-swiper 产品多角度展示 */
    .video-swiper {
        padding: 120px 0 70px;
    }

    .video-swiper .swiper-slide .img {
        height: 325px;
    }

    .video-swiper .swiper-slide h3 {
        padding-top: 38px;
        font-size: 24px;
    }

    /* hero-section6 技术规格 */
    .hero-section6 {
        padding: 100px 0 75px;
    }

    .hero6-title {
        margin-bottom: 80px;
    }

    .hero6-title h2 {
        min-width: 245px;
        min-height: 115px;
        padding: 20px 30px;
        font-size: 40px;
    }

    .hero6-content {
        grid-template-columns: minmax(390px, 510px) minmax(560px, 1fr);
        gap: 80px;
    }

    .hero6-spec-list .spec-item {
        grid-template-columns: minmax(0, 1fr) 120px;
        min-height: 63px;
    }

    .hero6-spec-list dt,
    .hero6-spec-list dd {
        font-size: 21px;
    }

    .hero6-accordion {
        padding: 30px 62px 40px;
    }

    .hero6-panel-title {
        min-height: 52px;
        padding: 8px 20px;
        font-size: 18px;
    }

    .hero6-panel-content {
        padding: 18px 48px 38px;
    }

    .hero6-panel-content .detail-item {
        grid-template-columns: minmax(0, 1fr) 155px;
        min-height: 36px;
    }

    .hero6-panel-content dt,
    .hero6-panel-content dd {
        font-size: 15px;
    }

    /* hero-section7 参考业绩 */
    .hero-section7 {
        padding: 65px 0 75px;
    }

    .hero7-title {
        margin-bottom: 45px;
    }

    .hero7-title h2 {
        font-size: 42px;
    }

    .hero7-tabs {
        width: 720px;
        margin-bottom: 55px;
    }

    .hero7-tab {
        padding: 0 12px 13px;
        font-size: 21px;
    }

    .hero7-pane {
        grid-template-columns: minmax(390px, 44%) minmax(520px, 56%);
        gap: 65px;
    }

    .hero7-text p {
        margin-bottom: 18px;
        font-size: 18px;
        line-height: 2.1;
    }

    .hero7-image {
        height: 430px;
    }

    /* hero-section8 电动与柴油对比 */
    .hero-section8 {
        padding: 95px 0 65px;
    }

    .hero-section8 .tit-seven {
        margin-bottom: 45px;
    }

    .hero-section8 .tit-seven .p1 {
        margin-bottom: 12px;
        font-size: 21px;
    }

    .hero-section8 .tit-seven .p2 {
        font-size: 42px;
    }

    .hero-section8 .imgy {
        margin-top: 40px;
        margin-bottom: 50px;
    }

    .hero-section8 .txt2 {
        margin-right: 60px;
        margin-left: 60px;
    }

    .hero-section8 .txt2 .q1 {
        margin-bottom: 14px;
        padding-bottom: 14px;
        font-size: 17px;
    }

    .hero-section8 .txt2 .q2 {
        max-width: 940px;
        font-size: 14px;
    }
}


/* =====================================================
   ≤ 1440px
===================================================== */

@media screen and (max-width: 1440px) {

    /* section6 项目轮播 */
    .section6 {
        padding-top: 70px;
    }

    .hm-title6 {
        font-size: 42px;
    }

    .project-name {
        font-size: 28px;
    }

    .swiper-next,
    .swiper-page,
    .swiper-prev {
        width: 60px;
        height: 60px;
    }

    /* section9 */
    .section9-content h2 {
        font-size: 34px;
    }

    .section9-content p {
        font-size: 15px;
    }

    /* section10 新闻列表 */
    .section10 {
        padding: 80px 0;
    }

    .hm-title10 h3 {
        font-size: 36px;
    }

    .hm-title10 ul {
        gap: 30px;
    }

    .section10-list {
        gap: 30px;
    }
}


/* =====================================================
   ≤ 1400px 小屏电脑
===================================================== */

@media screen and (max-width: 1400px) {

    /* hero-section4 产品图文详情 */
    .hero-section4 .item .img {
        height: 460px;
    }

    .hero-section4 .item .txt {
        min-height: 460px;
        padding: 45px 50px 40px;
    }

    .hero-section4 .item .txt .tx1 {
        font-size: 24px;
    }

    .hero-section4 .item .txt .tx2 {
        font-size: 16px;
        line-height: 2;
    }

    /* hero-section5 可选装模块 */
    .hero5-left {
        flex-basis: 32%;
        width: 32%;
    }

    .hero5-left-inner {
        padding: 60px 35px;
    }

    .hero5-left .ty1 {
        margin-bottom: 100px;
        font-size: 32px;
    }

    .hero5-left .ty2 li {
        margin-bottom: 20px;
    }

    .hero5-left .ty2 li a {
        font-size: 16px;
    }

    .hero5-right {
        padding: 145px 0 70px 30px;
    }

    .hero5-swiper .swiper-slide {
        width: 72%;
    }

    .hero5-card .img {
        height: 390px;
    }

    .hero5-card .txt h3 {
        font-size: 24px;
    }
}


/* =====================================================
   ≤ 1280px
===================================================== */

@media screen and (max-width: 1280px) {

    /* 布局容器 */
    .max1200,
    .max1300,
    .max1400,
    .max1500,
    .max1520,
    .max1600,
    .max1710 {
        width: 92%;
    }

    /* 搜索弹窗 */
    .search-comp-main {
        width: 60%;
        padding: 35px 50px 45px;
    }

    /* section6 项目轮播 */
    .section6 {
        padding-top: 60px;
    }

    .hm-title6 {
        font-size: 36px;
        margin-bottom: 35px;
    }

    .project-name {
        font-size: 24px;
    }

    .section6-control {
        gap: 10px;
    }

    .swiper-next,
    .swiper-page,
    .swiper-prev {
        width: 52px;
        height: 52px;
    }

    /* section9 */
    .section9-content {
        width: 50%;
    }

    .section9-content a {
        margin-top: 40px;
    }

    /* section10 新闻列表 */
    .section10 {
        padding: 70px 0;
    }

    .hm-title10 {
        margin-bottom: 45px;
    }

    .hm-title10 h3 {
        font-size: 32px;
    }

    .section10-list {
        gap: 20px;
    }

    .section10-list h3 {
        font-size: 17px;
    }

    .section10-list .pp {
        font-size: 15px;
    }
}


/* =====================================================
   ≤ 1200px 小屏电脑 / 平板横屏
===================================================== */

@media screen and (max-width: 1200px) {

    /* hero-section2 产品简介 */
    .hero-section2 .wz1 {
        font-size: 18px;
        line-height: 1.8;
    }

    /* hero-section3 产品功能轮播 */
    .hero3-left {
        flex-basis: 32%;
        width: 32%;
    }

    .hero3-left-inner {
        padding: 60px 35px;
    }

    .hero3-left .ty1 {
        margin-bottom: 65px;
        font-size: 32px;
    }

    .hero3-left .ty2 li {
        margin-bottom: 24px;
    }

    .hero3-left .ty2 li a {
        font-size: 17px;
    }

    .hero3-right {
        padding: 150px 0 70px 30px;
    }

    .hero3-swiper .swiper-slide {
        width: 70%;
    }

    .hero3-card .img {
        height: 390px;
    }

    /* video-swiper 产品多角度展示 */
    .video-swiper {
        padding: 90px 0 60px;
    }

    .video-swiper .swiper-slide .img {
        height: 290px;
    }

    .video-swiper .swiper-slide h3 {
        padding-top: 30px;
        font-size: 22px;
    }

    /* hero-section6 技术规格 */
    .hero-section6 {
        padding: 80px 0 65px;
    }

    .hero6-title {
        margin-bottom: 60px;
    }

    .hero6-title h2 {
        min-width: 210px;
        min-height: 100px;
        font-size: 34px;
    }

    .hero6-content {
        grid-template-columns: minmax(340px, 43%) minmax(0, 57%);
        gap: 45px;
    }

    .hero6-spec-list .spec-item {
        grid-template-columns: minmax(0, 1fr) 100px;
        min-height: 56px;
    }

    .hero6-spec-list dt,
    .hero6-spec-list dd {
        font-size: 18px;
    }

    .hero6-accordion {
        padding: 25px 35px 35px;
    }

    .hero6-panel-title {
        padding-right: 10px;
        padding-left: 10px;
        font-size: 17px;
    }

    .hero6-panel-content {
        padding: 15px 30px 30px;
    }

    .hero6-panel-content .detail-item {
        grid-template-columns: minmax(0, 1fr) 125px;
    }

    .hero6-panel-content dt,
    .hero6-panel-content dd {
        font-size: 14px;
    }

    /* hero-section7 参考业绩 */
    .hero-section7 {
        padding: 60px 0 70px;
    }

    .hero7-title h2 {
        font-size: 36px;
    }

    .hero7-tabs {
        width: 650px;
        margin-bottom: 45px;
    }

    .hero7-tab {
        font-size: 18px;
    }

    .hero7-pane {
        grid-template-columns: minmax(360px, 45%) minmax(470px, 55%);
        gap: 40px;
    }

    .hero7-text p {
        font-size: 16px;
        line-height: 2;
    }

    .hero7-image {
        height: 375px;
    }

    /* hero-section8 电动与柴油对比 */
    .hero-section8 {
        padding: 75px 0 55px;
    }

    .hero-section8 .tit-seven {
        margin-bottom: 35px;
    }

    .hero-section8 .tit-seven .p1 {
        margin-bottom: 9px;
        font-size: 18px;
    }

    .hero-section8 .tit-seven .p2 {
        font-size: 36px;
    }

    .hero-section8 .imgy {
        margin-top: 30px;
        margin-bottom: 40px;
    }

    .hero-section8 .txt2 {
        margin-right: 35px;
        margin-left: 35px;
    }

    .hero-section8 .txt2 .q1 {
        font-size: 16px;
    }

    .hero-section8 .txt2 .q2 {
        font-size: 13px;
        line-height: 1.7;
    }
}


/* =====================================================
   ≤ 1199px 平板横屏（hero-section4 专用断点）
===================================================== */

@media screen and (max-width: 1199px) {
    .hero-section4 .item .img {
        height: 410px;
    }

    .hero-section4 .item .txt {
        min-height: 410px;
        padding: 38px 40px 34px;
    }

    .hero-section4 .item .txt .tx1 {
        font-size: 22px;
    }

    .hero-section4 .item .txt .tx2 {
        font-size: 15px;
        line-height: 1.9;
    }
}


/* =====================================================
   ≤ 1024px
===================================================== */

@media screen and (max-width: 1024px) {

    /* 头部 */
    .header {
        padding: 15px 0;
    }

    .header.scroll {
        background-color: #3f3f3f;
    }

    /* 产品列表页 */
    .products-list2 li .copyu {
        padding: 24px;
    }
}


/* =====================================================
   ≥ 1025px（修复原 min-width:1024 与上方断点重叠）
===================================================== */

@media screen and (min-width: 1025px) {
    .header.scroll {
        background: #3f3f3f;
    }

    /* 新闻详情页 */
    .news-xq-left {
        margin-right: 2rem;
        margin-bottom: 0px;
    }

    .news-xq-right {
        width: 390px;
    }
}


/* =====================================================
   ≤ 991px 平板竖屏
===================================================== */

@media screen and (max-width: 991px) {

    /* section1 首屏（原断点 992，统一为 991） */
    .section1 {
        height: auto;
    }

    .section1 .video-all {
        padding-bottom: 56.25%;
    }

    /* hero-section1 产品详情首屏 */
    .hero-section1 .hero-detail-section__content {
        width: 52%;
        padding: 35px 30px;
    }

    .hero-section1 .hero-detail-section__content .bottom {
        left: 30px;
        right: 30px;
        bottom: 40px;
    }

    .hero-section1 .hero-detail-section__content h3 {
        width: 100%;
    }

    /* hero-section4 产品图文详情 */
    .hero-section4 .item .img {
        height: 360px;
    }

    .hero-section4 .item .txt {
        min-height: 360px;
        padding: 30px 30px 28px;
    }

    .hero-section4 .item .txt .tx1 {
        font-size: 20px;
        line-height: 1.4;
    }

    .hero-section4 .item .txt .tx2 {
        font-size: 14px;
        line-height: 1.8;
    }

    /* hero-section5 可选装模块 */
    .hero5-left {
        flex-basis: 35%;
        width: 35%;
    }

    .hero5-left-inner {
        padding: 45px 25px;
    }

    .hero5-left .ty1 {
        margin-bottom: 70px;
        font-size: 27px;
    }

    .hero5-left .ty2 li {
        margin-bottom: 17px;
    }

    .hero5-left .ty2 li a {
        font-size: 15px;
    }

    .hero5-right {
        padding: 110px 0 60px 22px;
    }

    .hero5-swiper .swiper-slide {
        width: 82%;
    }

    .hero5-card .img {
        height: 330px;
    }

    .hero5-card .txt h3 {
        font-size: 21px;
    }

    /* video-swiper 产品多角度展示 */
    .video-swiper {
        padding: 70px 0 50px;
    }

    .video-swiper .swiper-slide .img {
        height: 260px;
    }

    .video-swiper .swiper-slide h3 {
        padding-top: 24px;
        font-size: 20px;
    }

    /* hero-section6 技术规格 */
    .hero-section6 {
        padding: 60px 0;
    }

    .hero6-title {
        margin-bottom: 45px;
    }

    .hero6-title h2 {
        min-width: 180px;
        min-height: 85px;
        font-size: 29px;
    }

    .hero6-content {
        display: block;
    }

    .hero6-base {
        margin-bottom: 50px;
    }

    .hero6-spec-list {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        column-gap: 50px;
    }

    .hero6-spec-list .spec-item {
        grid-template-columns: minmax(0, 1fr) 90px;
        min-height: 54px;
        border-bottom: 1px solid #eee;
    }

    .hero6-spec-list dt,
    .hero6-spec-list dd {
        font-size: 16px;
    }

    .hero6-accordion {
        padding: 25px 35px 35px;
    }

    /* hero-section7 参考业绩 */
    .hero-section7 {
        padding: 50px 0 60px;
    }

    .hero7-title {
        margin-bottom: 35px;
    }

    .hero7-title h2 {
        font-size: 31px;
    }

    .hero7-tabs {
        width: 100%;
        margin-bottom: 40px;
    }

    .hero7-tab {
        font-size: 16px;
        text-align: center;
    }

    .hero7-pane {
        grid-template-columns: 1fr;
        gap: 35px;
    }

    .hero7-text {
        padding: 0;
    }

    .hero7-text p {
        font-size: 15px;
        line-height: 1.9;
    }

    .hero7-image {
        height: 420px;
    }

    /* hero-section8 电动与柴油对比 */
    .hero-section8 {
        padding: 60px 0 50px;
    }

    .hero-section8 .tit-seven {
        margin-bottom: 30px;
    }

    .hero-section8 .tit-seven .p1 {
        font-size: 17px;
    }

    .hero-section8 .tit-seven .p2 {
        font-size: 32px;
    }

    /*
     * 图表信息较多，平板端允许横向滚动，
     * 避免文字和数值被压缩得太小。
     */
    .hero-section8 .imgy {
        margin-top: 25px;
        margin-bottom: 35px;
        overflow-x: auto;
        scrollbar-width: thin;
    }

    .hero-section8 .imgy img {
        width: 100%;
        max-width: 100%;
    }

    .hero-section8 .txt2 {
        margin: 0;
    }

    .hero-section8 .txt2 .q1 {
        font-size: 16px;
    }

    .hero-section8 .txt2 .q2 {
        max-width: 100%;
        font-size: 13px;
    }
}


/* =====================================================
   ≤ 768px 手机通用
===================================================== */

@media screen and (max-width: 768px) {

    /* 宽度工具类 */
    .w-1-2,
    .w-1-3,
    .w-1-4 {
        width: 100%;
    }

    /* 搜索弹窗 */
    .search-comp-main {
        width: 100%;
        min-height: 230px;
        padding: 25px 25px 40px;
    }

    .search-comp-header {
        margin-bottom: 35px;
    }

    .search-comp-row input {
        height: 44px;
        font-size: 20px;
        line-height: 44px;
    }

    .search-comp-submit {
        height: 44px;
        padding-left: 20px;
        line-height: 44px;
    }

    .search-comp-note {
        font-size: 13px;
    }

    /* section6 项目轮播 */
    .section6 {
        padding-top: 40px;
    }

    .hm-title6 {
        font-size: 26px;
        line-height: 1.5;
        margin-bottom: 25px;
    }

    .project-item {
        aspect-ratio: 16/9;
    }

    .project-name {
        left: 5%;
        top: 15%;
        font-size: 18px;
    }

    .section6-control {
        left: 5%;
        bottom: 10%;
        gap: 8px;
    }

    .swiper-next,
    .swiper-page,
    .swiper-prev {
        width: 40px;
        height: 40px;
    }

    .swiper-page {
        font-size: 13px;
    }

    .swiper-next i,
    .swiper-prev i {
        width: 20px;
        height: 11px;
        background-size: 20px 11px;
    }

    /* section7 视频区 */
    .video-listx {
        display: block;
    }

    .video-big,
    .video-right {
        width: 100%;
    }

    .video-big {
        aspect-ratio: 16/9;
    }

    .video-small {
        height: auto;
        aspect-ratio: 16/9;
    }

    /* section9 */
    .section9 {
        padding: 40px 0 0;
    }

    .section9-box {
        aspect-ratio: auto;
    }

    .section9-bg {
        position: relative;
        height: 500px;
    }

    .section9-content {
        width: 85%;
        left: 7%;
        top: 12%;
    }

    .section9-content h2 {
        font-size: 26px;
    }

    .section9-content p {
        font-size: 14px;
        line-height: 1.8;
    }

    .section9-menu {
        position: relative;
        width: 100%;
        height: 160px;
        display: flex;
        flex-direction: row;
    }

    .section9-menu a {
        border-bottom: 0;
        border-right: 1px solid rgba(255, 255, 255, .3);
    }

    .section9-menu i {
        font-size: 28px;
    }

    .section9-menu span {
        font-size: 14px;
    }

    /* section10 新闻列表 */
    .section10 {
        padding: 45px 0;
    }

    .hm-title10 {
        display: block;
        margin-bottom: 30px;
    }

    .hm-title10 h3 {
        font-size: 26px;
        margin-bottom: 25px;
    }

    .hm-title10 ul {
        gap: 20px;
        flex-wrap: wrap;
    }

    .hm-title10 ul li a {
        font-size: 15px;
    }

    .section10-list {
        display: block;
    }

    .section10-list li {
        margin-bottom: 35px;
    }

    .section10-list .txt {
        padding-top: 18px;
    }

    .section10-list h3 {
        font-size: 18px;
    }

    .section10-list .pp {
        height: auto;
        max-height: 58px;
    }

    /* 页脚 */
    .foot-top {
        padding-top: 50px;
    }

    .foot-logowz {
        font-size: 16px;
    }

    .foot-middle {
        display: block;
        padding: 10px 10px;
    }

    .mid-left {
        width: 100%;
    }

    .x-message-wrap2 {
        width: 100%;
    }

    .mid-right {
        margin-top: 50px;
        text-align: left;
    }

    .aa-phone .p2 {
        font-size: 30px;
    }

    .x-agree {
        display: block;
    }

    .x-agree label {
        margin-bottom: 15px;
    }
}


/* =====================================================
   ≤ 767px 手机（hero 产品详情系列）
===================================================== */

@media screen and (max-width: 767px) {

    /* hero-section1 产品详情首屏 */
    .hero-section1 .hero-detail-section {
        align-items: flex-end;
    }

    .hero-section1 .hero-detail-section__content {
        width: 100%;
        height: 42vh;
        margin-top: auto;
        padding: 25px 20px;
        background: rgba(251, 251, 251, 0.94);
    }

    .hero-section1 .hero-detail-section__content .bottom {
        left: 20px;
        right: 20px;
        bottom: 25px;
    }

    .hero-section1 .hero-detail-section__content h1 {
        font-size: 0.54rem;
    }

    /* hero-section2 产品简介 */
    .hero-section2 {
        padding: 25px 0 30px;
    }

    .hero-section2 .wz1 {
        font-size: 14px;
        line-height: 1.8;
        text-align: left;
    }

    /* hero-section3 产品功能轮播 */
    .hero-section3 {
        display: block;
        min-height: auto;
    }

    .hero3-left {
        width: 100%;
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    }

    .hero3-left-inner {
        padding: 35px 20px 25px;
    }

    .hero3-left .ty1 {
        margin-bottom: 25px;
        font-size: 25px;
        line-height: 1.45;
    }

    .hero3-left .ty2 {
        display: flex;
        gap: 10px 22px;
        overflow-x: auto;
        padding-bottom: 5px;
        white-space: nowrap;
        scrollbar-width: none;
    }

    .hero3-left .ty2::-webkit-scrollbar {
        display: none;
    }

    .hero3-left .ty2 li {
        flex: none;
        margin: 0;
    }

    .hero3-left .ty2 li a {
        padding: 0 0 7px;
        font-size: 14px;
    }

    .hero3-left .ty2 li a::before {
        left: 0;
        top: auto;
        bottom: 0;
        transform: none;
    }

    .hero3-left .ty2 li.active a,
    .hero3-left .ty2 li:hover a {
        padding-left: 0;
    }

    .hero3-left .ty2 li.active a::before,
    .hero3-left .ty2 li:hover a::before {
        width: 100%;
    }

    .hero3-right {
        padding: 30px 0 50px 20px;
    }

    .hero3-swiper .swiper-slide {
        width: 86%;
    }

    .hero3-card .img {
        height: 260px;
        border-radius: 7px;
    }

    .hero3-card .txt {
        padding: 18px 5px 0;
    }

    .hero3-card .txt h3 {
        margin-bottom: 12px;
        font-size: 20px;
    }

    .hero3-card .txt p {
        font-size: 14px;
        line-height: 1.7;
    }

    .hero3-pagination {
        left: 20px;
        right: 20px;
        bottom: 25px;
    }

    .hero3-prev,
    .hero3-next {
        display: none;
    }

    /* hero-section4 产品图文详情 */
    .hero-section4 {
        border-top-color: #ddd;
    }

    /* 手机端改为单列 */
    .hero-section4 .item {
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    /* 所有项目图片均在上面 */
    .hero-section4 .item:nth-child(n) .img {
        order: 1;
        width: 100%;
        height: auto;
        min-height: 0;
    }

    /* 所有项目文字均在下面 */
    .hero-section4 .item:nth-child(n) .txt {
        order: 2;
        width: 100%;
        height: auto;
        min-height: 0;
    }

    .hero-section4 .item .img img {
        width: 100%;
        height: auto;
        min-height: 240px;
        max-height: 360px;
        object-fit: cover;
    }

    .hero-section4 .item .txt {
        display: block;
        padding: 28px 20px 38px;
    }

    .hero-section4 .item .txt .tx1 {
        margin-bottom: 18px;
        font-size: 20px;
        line-height: 1.45;
    }

    .hero-section4 .item .txt .tx2 {
        max-width: none;
        font-size: 14px;
        line-height: 1.9;
        text-align: left;
    }

    /* 手机端取消图片悬停放大 */
    .hero-section4 .item:hover .img img {
        transform: none;
    }

    /* video-swiper 产品多角度展示 */
    .video-swiper {
        padding: 45px 0 38px;
        border-bottom-width: 1px;
    }

    .video-swiper .swiper-slide .img {
        height: 230px;
    }

    .video-swiper .swiper-slide h3 {
        padding: 18px 10px 0;
        font-size: 17px;
        line-height: 1.4;
    }

    .video-swiper .swiper-slide:hover .img img {
        transform: none;
    }

    /* hero-section5 可选装模块 */
    .hero-section5 {
        display: block;
        min-height: auto;
    }

    .hero5-left {
        width: 100%;
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.45);
    }

    .hero5-left-inner {
        padding: 35px 20px 25px;
    }

    .hero5-left .ty1 {
        margin-bottom: 25px;
        font-size: 25px;
        line-height: 1.4;
    }

    .hero5-left .ty2 {
        display: flex;
        gap: 10px 22px;
        overflow-x: auto;
        padding-bottom: 5px;
        white-space: nowrap;
        scrollbar-width: none;
    }

    .hero5-left .ty2::-webkit-scrollbar {
        display: none;
    }

    .hero5-left .ty2 li {
        flex: none;
        margin: 0;
    }

    .hero5-left .ty2 li a {
        padding: 0 0 7px;
        font-size: 14px;
    }

    .hero5-left .ty2 li a::before {
        left: 0;
        top: auto;
        bottom: 0;
        transform: none;
    }

    .hero5-left .ty2 li.active a,
    .hero5-left .ty2 li:hover a {
        padding-left: 0;
    }

    .hero5-left .ty2 li.active a::before,
    .hero5-left .ty2 li:hover a::before {
        width: 100%;
    }

    .hero5-right {
        min-height: auto;
        padding: 30px 0 55px 20px;
    }

    .hero5-swiper .swiper-slide {
        width: 86%;
    }

    .hero5-card .img {
        height: 260px;
        border-radius: 7px;
    }

    .hero5-card .txt {
        padding: 18px 5px 0;
    }

    .hero5-card .txt h3 {
        font-size: 20px;
    }

    .hero5-pagination {
        left: 20px;
        right: 20px;
        bottom: 25px;
    }

    .hero5-prev,
    .hero5-next {
        display: none;
    }

    .hero5-card:hover .img img {
        transform: none;
    }

    /* hero-section6 技术规格 */
    .hero-section6 {
        padding: 40px 0;
    }

    .hero6-title {
        margin-bottom: 35px;
    }

    .hero6-title h2 {
        min-width: 145px;
        min-height: 68px;
        padding: 15px 20px;
        font-size: 25px;
    }

    .hero6-base {
        margin-bottom: 35px;
    }

    .hero6-spec-list {
        display: block;
    }

    .hero6-spec-list .spec-item {
        grid-template-columns: minmax(0, 1fr) 105px;
        min-height: 50px;
        column-gap: 15px;
    }

    .hero6-spec-list dt,
    .hero6-spec-list dd {
        font-size: 14px;
    }

    .hero6-spec-list dt {
        white-space: normal;
    }

    .hero6-accordion {
        padding: 12px 15px 20px;
    }

    .hero6-panel-title {
        min-height: 50px;
        padding: 8px 5px;
        font-size: 16px;
    }

    .hero6-panel-title i {
        width: 17px;
        height: 17px;
        margin-right: 12px;
    }

    .hero6-panel-content {
        padding: 10px 5px 25px 29px;
    }

    .hero6-panel-content .detail-item {
        grid-template-columns: minmax(0, 1fr) 85px;
        min-height: 38px;
        column-gap: 15px;
    }

    .hero6-panel-content dt,
    .hero6-panel-content dd {
        font-size: 13px;
        line-height: 1.6;
    }

    .hero6-panel-content dt {
        overflow-wrap: anywhere;
    }

    /* hero-section7 参考业绩 */
    .hero-section7 {
        padding: 40px 0 45px;
    }

    .hero7-title {
        margin-bottom: 28px;
    }

    .hero7-title h2 {
        font-size: 27px;
    }

    /* 手机端 Tab 可以横向滚动 */
    .hero7-tabs {
        justify-content: flex-start;
        gap: 25px;
        overflow-x: auto;
        margin-bottom: 30px;
        border-bottom: 1px solid #aaa;
        white-space: nowrap;
        scrollbar-width: none;
    }

    .hero7-tabs::-webkit-scrollbar {
        display: none;
    }

    .hero7-tab {
        flex: none;
        min-width: max-content;
        padding: 0 0 10px;
        font-size: 15px;
        text-align: left;
    }

    .hero7-pane {
        gap: 25px;
    }

    .hero7-text p {
        margin-bottom: 14px;
        font-size: 14px;
        line-height: 1.9;
        text-align: left;
    }

    .hero7-image {
        height: auto;
        aspect-ratio: 16 / 9;
    }

    .hero7-image img {
        height: 100%;
    }

    /* hero-section8 电动与柴油对比 */
    .hero-section8 {
        padding: 42px 0 38px;
        border-bottom-width: 1px;
    }

    .hero-section8 .tit-seven {
        margin-bottom: 25px;
    }

    .hero-section8 .tit-seven .p1 {
        margin-bottom: 7px;
        font-size: 15px;
    }

    .hero-section8 .tit-seven .p2 {
        font-size: 27px;
    }

    .hero-section8 .imgy {
        margin-top: 20px;
        margin-bottom: 30px;
        padding-bottom: 10px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /*
     * 图表中包含大量小字号文字，
     * 手机端保持图片宽度并通过横向滑动查看。
     */
    .hero-section8 .imgy img {
        width: 850px;
        max-width: none;
    }

    .hero-section8 .txt2 {
        margin: 0;
    }

    .hero-section8 .txt2 .q1 {
        margin-bottom: 12px;
        padding-bottom: 12px;
        border-bottom-width: 1px;
        font-size: 16px;
    }

    .hero-section8 .txt2 .q2 {
        font-size: 13px;
        line-height: 1.75;
    }
}


/* =====================================================
   ≤ 480px 小屏手机
===================================================== */

@media screen and (max-width: 480px) {

    /* section6 项目轮播 */
    .hm-title6 {
        font-size: 22px;
    }

    .project-name {
        font-size: 18px;
    }

    .swiper-next,
    .swiper-page,
    .swiper-prev {
        width: 40px;
        height: 40px;
    }

    .section6-control {
        gap: 6px;
    }

    /* section10 新闻列表 */
    .hm-title10 h3 {
        font-size: 22px;
    }

    .hm-title10 ul {
        gap: 15px;
    }

    .section10-list h3 {
        font-size: 17px;
    }

    .section10-list .tim {
        margin-top: 15px;
        margin-bottom: 20px;
    }

    /* hero-section4 产品图文详情 */
    .hero-section4 .item .img img {
        min-height: 210px;
        max-height: 300px;
    }

    .hero-section4 .item .txt {
        padding: 24px 16px 32px;
    }

    .hero-section4 .item .txt .tx1 {
        margin-bottom: 15px;
        font-size: 18px;
    }

    .hero-section4 .item .txt .tx2 {
        font-size: 14px;
        line-height: 1.8;
    }

    /* video-swiper 产品多角度展示 */
    .video-swiper {
        padding: 35px 0 30px;
    }

    .video-swiper .swiper-slide .img {
        height: 210px;
    }

    .video-swiper .swiper-slide h3 {
        padding-top: 15px;
        font-size: 16px;
    }

    /* hero-section6 技术规格 */
    .hero6-title h2 {
        min-width: 130px;
        min-height: 60px;
        font-size: 22px;
    }

    .hero6-spec-list .spec-item {
        grid-template-columns: minmax(0, 1fr) 80px;
    }

    .hero6-panel-content {
        padding-left: 5px;
    }

    .hero6-panel-content .detail-item {
        grid-template-columns: minmax(0, 1fr) 72px;
        column-gap: 10px;
    }

    /* hero-section7 参考业绩 */
    .hero-section7 {
        padding: 35px 0 40px;
    }

    .hero7-title h2 {
        font-size: 24px;
    }

    .hero7-tabs {
        gap: 20px;
    }

    .hero7-tab {
        font-size: 14px;
    }

    .hero7-text p {
        font-size: 14px;
        line-height: 1.8;
    }

    /* hero-section8 电动与柴油对比 */
    .hero-section8 {
        padding: 35px 0 32px;
    }

    .hero-section8 .tit-seven .p1 {
        font-size: 14px;
    }

    .hero-section8 .tit-seven .p2 {
        font-size: 24px;
    }

    .hero-section8 .imgy {
        margin-bottom: 25px;
    }

    .hero-section8 .imgy img {
        width: 100%;
        max-width: 100%;
    }

    .hero-section8 .txt2 .q1 {
        font-size: 15px;
    }

    .hero-section8 .txt2 .q2 {
        font-size: 12px;
        line-height: 1.75;
    }
}


/* =====================================================
   移动端间距修正（首页 / 新闻 / 产品列表通用板块）
   -----------------------------------------------------
   以下板块原本只有 rem 尺寸、没有移动端媒体查询，
   小屏下 1.1rem / 2.3rem 等间距被放得过大。
   这里统一在小屏改为合理的 px 值。
   置于文件末尾，保证覆盖前面的规则。
===================================================== */

/* -----------------------------------------------------
   ≤ 991px 平板
----------------------------------------------------- */

@media screen and (max-width: 991px) {

    /* section1 首屏标题 */
    .section1-title {
        left: 30px;
        right: 30px;
        bottom: 30px;
    }

    .section1-title h2 {
        font-size: 34px;
    }

    .section1-title h3 {
        font-size: 18px;
    }

    /* 产品列表页：右侧固定筛选栏改为普通文档流 */
    .page-wrap-product {
        padding-top: 90px;
    }

    .product-section-comp {
        display: block;
    }

    .product-section-comp .products {
        width: 100% !important;
        min-height: auto;
    }

    .product-section-comp .cp-filters {
        position: static;
        width: 100%;
        height: auto;
        overflow-y: visible;
    }

    .product-section-comp .cp-filters .filters {
        padding: 0 20px;
    }

    .products-list2 li .copyu h3 {
        font-size: 15px;
    }

    .filters-top {
        margin: 30px 0;
    }

    .filters-top .p1 {
        font-size: 20px;
    }

    .filters-top .p2 {
        font-size: 15px;
    }

    .filters-mid {
        padding-bottom: 20px;
        margin-bottom: 20px;
    }

    .filters-mid ul li {
        padding: 8px;
        padding-left: 0;
        font-size: 14px;
    }
}


/* -----------------------------------------------------
   ≤ 768px 手机
----------------------------------------------------- */

@media screen and (max-width: 768px) {

    /* section1 首屏标题（原 left/bottom: 1.1rem 过大） */
    .section1-title {
        left: 20px;
        right: 20px;
        bottom: 20px;
    }

    .section1-title h2 {
        font-size: 24px;
    }

    .section1-title h3 {
        font-size: 14px;
        margin-top: 8px;
    }

    /* section2 主要产品系列 */
    .section2 {
        padding: 45px 0;
    }

    .hm-title2 {
        font-size: 22px;
    }

    .section2 ul {
        flex-wrap: wrap;
        gap: 15px;
        margin-top: 25px;
    }

    .section2 ul li {
        flex: 0 0 100%;
        border-radius: 15px;
    }

    .section2 ul li .img {
        aspect-ratio: 16 / 10;
        border-radius: 15px;
    }

    .section2 ul li .txt {
        padding-top: 30px;
    }

    .section2 ul li h3 {
        font-size: 16px;
    }

    .section2 ul li .link {
        width: 40px;
        height: 40px;
        margin-top: 25px;
        background-size: 16px;
    }

    .section2 ul li:hover {
        transform: none;
    }

    /* section4 视频列表（原 4 栏改为 2 栏） */
    .section4 {
        padding: 45px 0;
    }

    .hm-title4 {
        margin-bottom: 25px;
        font-size: 22px;
        line-height: 1.5;
    }

    .section4-list {
        flex-wrap: wrap;
        gap: 15px;
    }

    .section4-list li {
        flex: 0 0 calc(50% - 8px);
    }

    .video-item .img {
        min-height: 0;
        height: 160px;
        margin: 10px;
    }

    .pin_swiper .swiper-slide .img{
        min-height: 0;
        height: 160px;
        margin: 10px;
    }


    .pin_swiper .swiper-slide h3{
        font-size: 15px;
    }


    .section4-list .txt {
        padding: 8px 10px 18px;
    }

    .section4-list h3 {
        font-size: 13px;
    }

    /* section7 视频拼版上下间距（原 margin: 1.3rem 0） */
    .section7 {
        margin: 45px 0;
    }

    /* 页脚 */
    .foot-top {
        padding-bottom: 30px;
    }

    .foot-logo img {
        max-width: 220px;
    }

    .foot-logowz {
        margin-top: 20px;
    }

    .x-message-wrap2 input[type=text],
    .x-message-wrap2 textarea {
        height: 45px;
        margin-bottom: 15px;
        font-size: 14px;
    }

    .x-message-wrap2 textarea {
        height: 70px;
        padding-top: 12px;
    }

    .x-agree .checkbox label {
        font-size: 13px;
    }

    .aa-phone .p1 {
        margin-bottom: 10px;
        font-size: 14px;
    }

    .aa-share {
        justify-content: flex-start;
        margin-top: 25px;
    }

    /* 新闻列表 / 详情 */
    .news-shai {
        padding: 35px 0;
    }

    .news-shai .bti {
        margin-bottom: 15px;
        font-size: 18px;
    }

    .news-shai .bti2 {
        margin-top: 8px;
        margin-bottom: 15px;
        font-size: 14px;
    }

    .news-shai .btu a {
        padding: 8px 14px 8px 0;
        font-size: 13px;
    }

    .news-lie-wap {
        padding: 30px 0;
    }

    .xypg-news-detail {
        padding-top: 30px;
        padding-bottom: 30px;
    }

    .xq-detail-bar2 {
        margin-bottom: 20px;
    }

    .sma-img {
        margin-bottom: 20px;
    }

    .tuijian-news > h3 {
        margin-bottom: 15px;
        font-size: 20px;
    }

    .relate-news2 {
        margin-top: 30px;
        padding-top: 30px;
    }
}


/* -----------------------------------------------------
   ≤ 480px 小屏手机
----------------------------------------------------- */

@media screen and (max-width: 480px) {
    .logo{
        margin-right: 20px;
    }
    .logo a img{
        max-height: 22px;
    }

    .section1-title h2 {
        font-size: 20px;
    }

    .hm-title2 {
        font-size: 20px;
    }

    /* section4 视频列表改为单栏 */
    .section4-list li {
        flex: 0 0 100%;
    }

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

    .pin_swiper .swiper-slide .img{
        height: auto;
    }

    .hm-title4 {
        font-size: 20px;
    }

    .section7 {
        margin: 35px 0;
    }

    .foot-logo img {
        max-width: 180px;
    }

    .section9-content a{
        font-size: 14px;
        width: 150px;
        height: 45px;
    }
   
}