/* 解决滚动条问题，确保页面没有右侧滚动条 */
.about-page {
    min-height: 100vh;
    padding-top: 0; /* 移除顶部内边距 */
    overflow-x: hidden; /* 防止水平滚动 */
    position: relative;
}


.header-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    margin-bottom: 0; /* 移除底部间距 */
    margin-top: 0px; /* 添加顶部边距，与顶栏高度一致，确保默认状态下正确显示 */
}

.header-image {
    width: 100%;
    display: block;
}

/* 选项卡样式 */
.tab-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    margin-top: 50px;
}

.tab-nav {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.tab-item {
    font-size: 18px;
    font-weight: 500;
    color: #666;
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.tab-item:hover {
    color: #333;
}

.tab-item.active {
    color: #333;
    font-weight: 600;
}

.tab-item.active::after {
    content: '';
    position: absolute;
    bottom: -11px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #333;
}

.tab-content {
    min-height: 500px;
    margin-bottom: 80px;
}

.tab-pane {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 关于我们部分样式 */
.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.main-title {
    font-size: 36px;
    font-weight: 700;
    color: #333;
    margin-bottom: 15px;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #5d78ff);
    margin: 0 auto;
}

.section-title {
    font-size: 28px;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: #333;
}

.section-title.centered {
    text-align: center;
}

.section-title.centered::after {
    left: 50%;
    transform: translateX(-50%);
}

.section-text {
    font-size: 16px;
    line-height: 1.8;
    color: #555;
    margin-bottom: 30px;
}

/* 公司简介部分 */
.company-intro-section {
    margin-bottom: 0px;
}

.intro-text-container {
    width: 100%;
}

.intro-image-container {
    float: right;
    width: 45%;
    margin: 0 0 20px 30px;
    position: relative;
    z-index: 1;
}

.intro-image {
    width: 100%;
    display: block;
    transition: all 0.3s ease;
    border-radius: 0;
    box-shadow: none;
}

/* 清除浮动 */
.company-intro-text:after {
    content: "";
    display: table;
    clear: both;
}

.company-intro-text p {
    margin-bottom: 15px;
    font-size: 15px;
    line-height: 1.8;
    color: #555;
    text-align: justify;
}

/* 服务流程部分 */
.service-process-section {
    margin: 100px 0;
    padding: 50px 0;
    background-color: #f8f9fa;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.service-process-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #3498db, #5d78ff, #8e44ad);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
}

.service-process-container {
    max-width: 90%;
    margin: 0 auto;
}

.process-steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.process-step {
    flex: 0 0 calc(20%);
    max-width: calc(20% );
    text-align: center;
    transition: all 0.3s ease;
    padding: 30px 20px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    position: relative;
}

.process-step:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.process-icon {
    margin-bottom: 20px;
    text-align: center;
}

.process-icon img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.process-step:hover .process-icon img {
    transform: scale(1.1);
}

.process-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.process-desc {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
}

/* 企业文化部分 */
.company-vision-section {
    margin-bottom: 80px;
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.culture-item {
    background-color: #f9f9f9;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.culture-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #5d78ff);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.culture-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.culture-item:hover::before {
    transform: scaleX(1);
}

.culture-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(145deg, #4e9cf1, #3b78cd);
    color: white;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    box-shadow: 0 10px 20px rgba(59, 120, 205, 0.3);
}

.culture-icon::before {
    content: '';
    position: absolute;
    width: 90%;
    height: 90%;
    border-radius: 50%;
    background: linear-gradient(145deg, #3b78cd, #4e9cf1);
    z-index: -1;
    opacity: 0;
    transition: all 0.3s ease;
}

.culture-item:hover .culture-icon::before {
    opacity: 1;
    transform: scale(1.1);
}

.culture-item p {
    font-size: 15px;
    line-height: 1.6;
    color: #555;
}

/* 公司资质部分样式 */
.qualification-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.qualification-item {
    background-color: #f9f9f9;
    padding: 30px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.qualification-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.qualification-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 20px;
    color: #333;
}

.qualification-icon svg {
    width: 100%;
    height: 100%;
}

.qualification-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #333;
}

.qualification-item p {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

/* 联系我们部分样式 */
.contact-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: start;
    margin-top: 50px;
    margin-bottom: 60px;
}

.contact-card {
    width: 31.5%;
    background-color: #ffffff;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.card-header {
    background: linear-gradient(135deg, #0a1831, #1a2a4a);
    padding: 20px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.department-name {
    color: #ffffff;
    font-size: 20px;
    font-weight: 600;
    position: relative;
    padding: 0 30px;
}

.department-name::before {
    content: '';
    position: absolute;
    height: 2px;
    width: 20px;
    background-color: #ffffff;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
}

.department-name::after {
    content: '';
    position: absolute;
    height: 2px;
    width: 20px;
    background-color: #ffffff;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
}

.card-content {
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #ffffff;
}


.contact-info {
    flex: 1;
    background-color: #ffffff;
    margin-right: 15px; /* 增加右侧边距，防止和二维码重叠 */
}

.info-item {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column; /* 改为列方向显示 */
    align-items: flex-start; /* 顶部对齐 */
    background-color: transparent;
}

.info-item:last-child {
    margin-bottom: 0;
}

.info-item .label {
    font-weight: 500;
    color: #333;
    margin-right: 10px;
    margin-bottom: 5px; /* 添加下边距 */
    white-space: nowrap;
    background-color: transparent;
}

.info-item .value {
    color: #333;
    font-weight: 500;
    background-color: transparent;
}

.phone-number {
    font-weight: 600;
    font-size: 16px;
    color: #333;
    background-color: transparent;
}

.qr-code-placeholder {
    width: 100px;
    height: 100px;
    background-color: #f9f9f9;
    margin-left: 15px;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px dashed #ddd;
    img{
        width: 100%;
        height: 100%;
    }
}

/* 移动端适配 */
@media (max-width: 768px) {
    .about-page {
        padding-top: 0; /* 移除顶部内边距，因为已经使用 header-container 处理了 */
        margin-top: 60px!important;
    }

    .top-black-bar {
        height: 60px; /* 移动端顶栏高度 */
    }

    .header-container {
        margin-top: 0px;
        width: 120%; /* 使头图宽度超出屏幕 */
        margin-left: -10%; /* 负边距使图片两侧均超出 */
        overflow: hidden;
    }
    .header-image {
        width: 150%;
        max-width: none;
        margin-left: -50%; /* 使图片居中，隐藏两侧 */
        display: block;
        object-fit: cover;
        object-position: center;
        height: 100%;
    }

    .tab-container {
        padding: 40px 20px;
        margin-top: 10px;
    }

    /* 修改手机端切换栏样式 */
    .tab-nav {
        gap: 10px;
        justify-content: center;
        background-color: transparent;
        margin-bottom: 30px;
        padding: 10px 0;
        border-bottom: 1px solid #eee;
    }

    .tab-nav.scrolled {
        background-color: transparent;
        backdrop-filter: none;
        box-shadow: none;
    }

    .tab-item {
        font-size: 16px;
        padding: 8px 15px;
        position: relative;
    }

    .tab-item::after {
        display: none;
    }

    .tab-item.active {
        color: #333;
        font-weight: 600;
    }

    .tab-item.active::after {
        content: '';
        position: absolute;
        bottom: -11px;
        left: 0;
        width: 100%;
        height: 3px;
        background-color: #333;
        display: block;
    }

    /* 保留原有样式 */
    .company-intro-section {
        flex-direction: column;
        gap: 30px;
    }

    .intro-image-container {
        float: none;
        width: 100%;
        margin: 20px 0 30px;
    }

    .service-process-section {
        padding: 20px 20px;
        margin: 0;
    }

    .process-steps {
        gap: 20px;
    }

    .process-step {
        flex: 0 0 calc(50% - 20px);
        max-width: calc(50% - 20px);
    }

    .culture-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .qualification-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* 修改联系卡片在平板上的样式 */
    .contact-cards {
        flex-direction: column;
        align-items: center;
        gap: 20px;
        margin: 30px 0;
    }

    .contact-card {
        width: 100%;
        max-width: 375px;
    }

    .card-content {
        padding: 20px 15px;
        display: flex; /* 确保是flex布局 */
        flex-direction: row; /* 确保在平板上也是水平布局 */
        justify-content: space-between; /* 两端对齐 */
    }

    .info-item {
        margin-bottom: 10px;
        display: flex;
        flex-direction: column; /* 保持列布局 */
    }

    .info-item .label {
        font-size: 14px;
        margin-right: 0;
        margin-bottom: 3px; /* 减小垂直间距 */
    }

    .info-item .value {
        font-size: 14px;
    }

    .phone-number {
        font-size: 15px;
    }

    .qr-code-placeholder {
        width: 80px;
        height: 80px;
        margin-left: 10px;
    }
}

/* 更小屏幕设备适配 */
@media (max-width: 480px) {
    .about-page {
        padding-top: 0; /* 移除顶部内边距 */
        margin-top: 45px!important;
    }

    .top-black-bar {
        height: 0px; /* 更小屏幕的顶栏高度 */
    }

    .tab-container {
        padding: 10px 15px;
    }

    /* 修改手机端切换栏样式，保持与电脑端一致 */
    .tab-nav {
        flex-direction: row;
        align-items: center;
        gap: 15px;
        justify-content: center;
        padding: 0 0 10px 0;
        background-color: transparent;
        margin-bottom: 20px;
        border-bottom: 1px solid #eee;
    }

    .tab-nav.scrolled {
        background-color: transparent;
        backdrop-filter: none;
        box-shadow: none;
        padding: 0 0 10px 0;
    }

    .tab-item {
        text-align: center;
        padding: 8px 15px;
        margin: 0;
        font-size: 14px;
        border-bottom: none;
        position: relative;
    }

    .tab-item.active {
        color: #333;
        font-weight: 600;
        border-bottom: none;
    }

    .tab-item.active::after {
        content: '';
        position: absolute;
        bottom: -11px;
        left: 0;
        width: 100%;
        height: 3px;
        background-color: #333;
        display: block;
    }

    /* 保留原有样式 */
    .process-step {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .section-title {
        font-size: 24px;
    }

    .process-title {
        font-size: 16px;
    }

    /* 修改手机端联系卡片样式 */
    .card-content {
        padding: 25px 15px;
        flex-direction: row;
        align-items: center;
        background-color: #ffffff !important;
        min-height: 140px; /* 增加手机端卡片高度 */
    }

    /*.contact-info {*/
    /*    margin-bottom: 0;*/
    /*    margin-right: 10px; !* 保持右侧边距 *!*/
    /*    background-color: #ffffff !important;*/
    /*}*/


    .info-item {
        margin-bottom: 10px; /* 增加间距 */
        justify-content: flex-start;
        background-color: transparent !important;
        flex-direction: column; /* 保持列布局 */
    }

    .info-item .label {
        display: block;
        width: auto;
        text-align: left;
        margin-right: 0;
        margin-bottom: 3px; /* 减小垂直间距 */
        color: #333 !important;
        background-color: transparent !important;
    }

    .info-item .value {
        color: #333 !important;
        background-color: transparent !important;
    }

    .phone-number {
        font-size: 15px;
        color: #333 !important;
        background-color: transparent !important;
    }

    .qr-code-placeholder {
        width: 80px;
        height: 80px;
        margin-left: 10px;
        background-color: #f9f9f9 !important;
    }
}

/* 动画效果 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
    transition-delay: var(--delay, 0s);
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-up {
    transform: translateY(30px);
}

.fade-in-up.animated {
    transform: translateY(0);
}

.fade-in-left {
    transform: translateX(-30px);
}

.fade-in-left.animated {
    transform: translateX(0);
}

.fade-in-right {
    transform: translateX(30px);
}

.fade-in-right.animated {
    transform: translateX(0);
}

.scale-in {
    transform: scale(0.8);
}

.scale-in.animated {
    transform: scale(1);
}

/* 全局隐藏滚动条 */
html {
    overflow-y: scroll;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE 和 Edge */
}

html::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera*/
    width: 0;
}

/* 公司资质展示区样式 */
.certificates-gallery {
    margin: 50px 0;
}

.certificates-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.certificate-item {
    width: calc(25% - 20px);
    margin-bottom: 20px;
    position: relative;
    transition: all 0.3s ease;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}
.hengimg{
    width: calc(50% - 20px);
    height: 354px;
}

.certificate-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.certificate-img-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 130%;
    overflow: hidden;
    border-radius: 8px;
    background-color: #f8f9fa;
}

.certificate-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.5s ease;
}

.certificate-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    transition: all 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.certificate-item:hover .certificate-overlay {
    opacity: 1;
}

.certificate-item:hover .certificate-img {
    transform: scale(1.1);
}

.overlay-content {
    text-align: center;
    color: white;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.certificate-item:hover .overlay-content {
    transform: translateY(0);
}

.view-text {
    font-size: 16px;
    font-weight: 500;
}

/* 移动端适配 */
@media (max-width: 1200px) {
    .certificate-item {
        width: calc(33.33% - 20px);
    }
}

@media (max-width: 992px) {
    .certificate-item {
        width: calc(50% - 15px);
    }
}

@media (max-width: 576px) {
    .certificate-item {
        width: calc(50% - 15px);
        margin-bottom: 25px;
    }

    .certificate-img-wrapper {
        padding-bottom: 140%;
    }

    .certificates-row {
        margin-bottom: 0;
    }
}

/* 图片预览样式 */
.image-preview {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 1000;

    align-items: center;
    justify-content: center;
    display: none; /* 初始隐藏 */
}

.previewactive {
    display: flex;
}

.image-preview-content {
    position: relative;
    width: 80%;
    height: 80%;
    max-width: 1200px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.preview-image {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: transform 0.2s ease;
    cursor: zoom-in;
}

.close-icon {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background-color: transparent;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1001;
    opacity: 0.7;
    padding: 0;
}

.close-icon svg {
    transform: rotate(0deg);
    transition: transform 0.3s ease;
}

.close-icon:hover {
    border-color: rgba(255, 255, 255, 1);
    background-color: rgba(255, 255, 255, 0.1);
    opacity: 1;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

.close-icon:hover svg {
    transform: rotate(90deg);
}


@media (max-width: 768px) {


    /* 确保上面切换卡中的联系我们部分保持白色背景 */
    .tab-pane .contact-cards {
        background-color: transparent !important;
    }

    .tab-pane .contact-card {
        background-color: #ffffff !important;
    }

    .tab-pane .card-content {
        background-color: #ffffff !important;
    }

    .tab-pane .contact-info {
        background-color: transparent !important;
    }

    .footer-container {
        padding: 0 15px;
    }

    .footer-column {
        flex-basis: auto;
        min-width: 140px;
    }
}

@media (max-width: 480px) {
    /* 确保上面切换卡中的联系我们部分保持白色背景 */
    .tab-pane .contact-cards {
        background-color: transparent !important;
    }

    .tab-pane .contact-card {
        background-color: #ffffff !important;
    }

    .tab-pane .card-content {
        background-color: #ffffff !important;
    }

    .tab-pane .contact-info {
        background-color: transparent !important;
    }

    .footer-column {
        flex-basis: 40%;
    }

    .copyright {
        font-size: 12px;
    }

    .hengimg{
        width: calc(50% - 20px);
        height: 130px;
    }
}


.contact-card{
    border: 1px #EFEFEF solid;
    position: relative;
}

.contact-card div {
    width: 100%;
    height: 100%;
    display: inline-block;
    -webkit-transition: all .3s;
    outline: none;
    list-style: none;
}
.cimg {
    width: 388px;
    height: 200px;
}
.contact-card p {
    margin-top: 12px;
}
.contact-card p {
    width: 90%;
    padding-left: 30px;
    font-size: 16px;
    color: #828282;
    outline: none;
}
.ppimg {
    position: absolute;
    bottom: 11px;
    right: 12px;
}
.tab-bd-o_div{
    flex: 1;
    div{
        width: 100%;
        height: 50%;
        display: flex;
    }
}
.tab-bd-o img {
    display: inline-block;
    width: 68px;
    height: 69px;
    vertical-align: top;
    margin-top: 15px;
}
.tab-bd-th {
    flex: 1;
    border-left: 1px solid #E7E7E7;
    div{
        margin-top:5px;
        padding-left: 30%;
        display: flex;
        justify-content: start;
    }
    img{
        width: 35px;
        height: 35px;
    }
}
.tab-bd-o{
    display: flex;
    flex: 1;
}
.tab-bd-o p {
    display: inline-block;
    position: absolute;
    left: 90px;
    top: 45px;
    font-size: 14px;
    color: #848484;
}
.tab-bd-o h4{
    display: inline-block;
    font-weight: 400;
    font-size: 24px;
    margin-left: 15px;
    letter-spacing: 7px;
}
.tab-bd-th span {
    color: #959595;
    margin-left: 35px;
    font-size: 23px;
    line-height: 35px;
}
.h4{
    display: inline-block;
    line-height: 50px;
    font-weight: 400;
    font-size: 24px;
    margin-left: 15px;
    letter-spacing: 7px;
}
.h5{
    margin-left: 15px;
    line-height: 50px;
    display: inline-block;
    font-size: 14px;
    color: #848484;
    letter-spacing: 1px;
}
.tab-bd-t2 {
    height: 50px;
    display: inline-block;
    line-height: 50px;
    color: #4aa8ff;
    font-size: 23px;
    letter-spacing: 1px;
    margin-left: 5px;
}

@media (max-width: 768px) {
    .h4{
        display: inline-block;
        line-height: 45px;
        font-weight: 400;
        font-size: 20px;
        margin-left: 10px;
        letter-spacing: 7px;
    }

    .tab-bd-th {
        width: 100%;
        border-left:none;
        padding-left: 15px;
        div{
            padding-left: 0;
        }
        img{
            width: 35px;
            height: 35px;
        }
    }
}



/* 移动端适配 */
@media (max-width: 768px) {
    .bg_banner{
        height: 375px;
    }
    .cimg{
        width: 100%;
        height: auto;
    }
}