:root {
    --primary: #3370FF;
    --primary-dark: #2a5fd6;
    --secondary: #5d8eff;
    --light: #f0f8ff;
    --dark: #1a3b8b;
    --accent: #27c73b;
    --text: #333;
    --text-light: #666;
    --white: #ffffff;
    --gray: #f5f7fa;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
}

body {
    background-color: var(--white);
    color: var(--text);
    overflow-x: hidden;
}

/* 导航栏样式 */
header {
    background-color: transparent;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 30px 0;
    transition: all 0.3s ease;
}

header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    padding: 15px 0;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1760px;
    margin: 0 auto;
    padding: 0 60px;
    position: relative;
}

.logo img {
    height: 40px;
    transition: all 0.3s ease;
}

header.scrolled .logo img {
    height: 30px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 40px;
}

nav ul li a {
    text-decoration: none;
    color: var(--white);
    font-weight: 500;
    font-size: 16px;
    padding: 8px 0;
    position: relative;
    transition: color 0.3s;
}

header.scrolled nav ul li a {
    color: var(--text);

}

nav ul li a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;

}

nav ul li a:hover:after,
nav ul li a.active:after {
    width: 100%;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--white);
}

header.scrolled nav ul li a:hover,
header.scrolled nav ul li a.active {
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--white);
    cursor: pointer;
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
}

header.scrolled .mobile-menu-btn {
    color: var(--primary);
}

/* Banner样式 */
.banner {
    height: 680px;
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/about-banner-pc.jpg') no-repeat center center;
    background-size: cover;
    display: flex;
    align-items: center;
    position: relative;
}

.banner-case{
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/case-banner-pc.jpg') no-repeat center center;
}
.banner-technology{
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/technology-banner-pc.jpg') no-repeat center center;
}
.banner-value{
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/value-banner-pc.jpg') no-repeat center center;
}
.banner-jxq{
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/jxq-banner-pc.jpg') no-repeat center center;
}
.banner-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 60px;
    color: var(--white);
    width: 100%;
}

.banner-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    max-width: 800px;
}

.banner-content p {
    font-size: 20px;
    max-width: 600px;
    line-height: 1.6;
    opacity: 0.9;
}

/* 主内容区样式 */
.main-content {
    max-width: 1760px;
    margin: 0 auto;
    padding: 80px 60px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--primary);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary);
}

.section-title p {
    font-size: 18px;
    color: var(--text-light);
    max-width: 1000px;
    margin: 20px auto 0;
    line-height: 1.6;
}

/* 公司介绍部分 */
.company-intro {
    display: flex;
    gap: 60px;
    margin-bottom: 80px;
    align-items: center;
}

.company-info {
    flex: 1;
}

.company-info h3 {
    font-size: 28px;
    color: var(--dark);
    margin-bottom: 20px;
}

.company-info p {
    line-height: 1.8;
    margin-bottom: 15px;
    color: var(--text);
    font-size: 16px;
}

.highlight {

    font-weight: 600;
}

.company-image {
    flex: 1;
    border-radius: 10px;
    overflow: hidden;
    /* box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); */
    height: 400px;
}

.company-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 使命与愿景部分 */
.mission-vision {
    margin: 80px 0;
}

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

.mv-card {
    background: var(--white);
    background: #fafafc;
    border-radius: 10px;
    overflow: hidden;
    /* box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); */
    transition: all 0.3s ease;
    height: 300px;
}



.mv-card.image {
    padding: 0;
}

.mv-card.image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.mv-card.content {
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.mv-card h4 {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.mv-card i {
    margin-bottom: 40px;
    font-size: 48px;
    color: var(--primary);
}

.mv-card p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 18px;
}

/* 发展历程部分 - 新样式 */
.timeline-section {
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/about-sion-5.jpg') no-repeat center center;
    background-size: cover;
    padding: 80px 60px;
    border-radius: 10px;
    margin: 80px 0;
    color: var(--white);
}

.timeline-container {
    overflow-x: auto;
    padding: 20px 0 30px;
    -webkit-overflow-scrolling: touch;
}

.timeline-container::-webkit-scrollbar {
    height: 8px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 4px;
}

.timeline-container::-webkit-scrollbar-thumb {
    background-color: var(--gray);
    border-radius: 4px;
}

.timeline-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary);
}

.timeline-list {
    display: flex;
    gap: 30px;
    padding-bottom: 10px;
}

.timeline-item {
    min-width: 300px;
    background: rgba(255, 255, 255, 0.9);

    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}


.timeline-year {
    background: var(--primary);
    color: white;
    padding: 15px;
    font-size: 20px;
    font-weight: bold;
    text-align: center;
}

.timeline-content {
    padding: 20px;
}

.timeline-content ul {
    list-style: none;
}

.timeline-content ul li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    color: var(--text);
}

.timeline-content ul li:last-child {
    border-bottom: none;
}

.timeline-content ul li i {
    margin-right: 10px;
    color: var(--text);
}

/* 页脚样式 - 简化版 */
footer {
    background: #f3f3f3;
    color: var(--text);
    padding: 60px 0 30px;
}

.footer-container {
    max-width: 1760px;
    margin: 0 auto;
    padding: 0 60px;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 40px;
}
.footer-column{
    display: block;
    float: left;
    grid-column: 1 / 7;
}
.footer-column h3 {
    font-size: 20px;
    margin-bottom: 25px;
    position: relative;
}

.footer-column h3:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--primary);
}

.footer-column p, 
.footer-column li {
    color: var(--text);
    line-height: 1.8;
    margin-bottom: 10px;
}

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

.footer-column ul li {
    margin-bottom: 8px;
    display: inline-block;
    float: left;
    margin-right: 40px;
}

.footer-column ul li i {
    margin-right: 10px;
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    position: relative;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    transition: all 0.3s;
    position: relative;
}

.social-links a:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

.wechat-qr {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 150px;
    background: white;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    display: none;
}

.wechat-qr img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.social-links a:hover .wechat-qr {
    display: block;
}

.copyright {
    text-align: left;
    padding-top: 30px;
    margin-top: 40px;
    border-top: 1px solid rgba(84, 84, 84, 0.1);
    color: #aaa;
    font-size: 14px;
}
.copyright a{
    color: #333;
    text-decoration: none;
    float: left;
    line-height: 1.8;
    padding-left: 30px;
}
.copyright p{
    margin-bottom: 0;
    float: left;
    display: inline-block;
}
.contact-grid {
    display: flex;
    gap: 40px;
    align-items: center;
}

.contact-info {
    flex: 1;
}

.contact-qr {
    float: right;
    grid-column: 7 / 7;
}

.qr-code {
    text-align: center;
    background: white;
    padding:20px 10px;
    border-radius: 5px;
}

.qr-code img {
    width: 80%;
    object-fit: contain;
}

.qr-code p {
    margin-top: 3px;
    color: var(--text);
    font-weight: 500;
}

.stats-banner {
background: #fafafc;
background-size: cover;
margin: 60px 0;
border-radius: 10px;
overflow: hidden;
}

.stats-overlay {
    padding: 60px 40px;
    backdrop-filter: blur(2px);
}

.stats-container {
    display: flex;
    justify-content: space-around;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
    gap: 30px;
}

.stat-item {
    text-align: center;
    color: white;
    flex: 1;
    min-width: 150px;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary);
    transition: all 0.3s ease;
}

.stat-item:hover .stat-number {
    transform: scale(1.1);
}

.stat-label {
    font-size: 20px;
    color: var(--text);
    position: relative;
    display: inline-block;
}

.stat-label:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: var(--primary);
    transition: all 0.3s ease;
}

.stat-item:hover .stat-label:after {
    width: 60px;
    background: var(--white);
}

.case-card {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
    background:#fafafc;
    border-radius: 10px;
    overflow: hidden;
    /* box-shadow: 0 5px 15px rgba(0,0,0,0.05); */
    transition: all 0.3s ease;
}

/* .case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
} */

.case-card.reverse {
    flex-direction: row-reverse;
}

.case-content {
    flex: 1;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.case-content h3 {
    font-size: 24px;
    color: var(--text);
    margin-bottom: 15px;
}

.case-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.tag {
    background: var(--light);
    color: var(--primary);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.case-content p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 16px;
}

.case-image {
    flex: 1;
    min-height: 300px;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
/* 设备模块样式 */
.equipment-section {
    margin: 80px 0;
}
.equipment-sectio-mt{
    margin-top: 0;
}
.full-width-image {
    width: 100%;
    margin: 20px 0;
    border-radius: 10px;
    overflow: hidden;

}

.full-width-image img {
    width: 100%;
    height: auto;
    display: block;
}

.highlights-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.highlight-item {
    display: flex;
   
    gap: 20px;
    background: var(--white);
    background: #fafafc;
    border-radius: 10px;
    padding: 30px;
    /* box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); */
    transition: all 0.3s ease;
    
}



.highlight-image {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
}

.highlight-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.highlight-content h4 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 10px;
}

.highlight-content p {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 14px;
}
/* 表格样式 */
.equipment-table-container {
    overflow-x: auto;
    padding: 20px 0 30px;
    -webkit-overflow-scrolling: touch;
    margin: 40px 0;
}

.equipment-table-container::-webkit-scrollbar {
    height: 8px;
    background-color: rgba(51,112,255,0.1);
    border-radius: 4px;
}

.equipment-table-container::-webkit-scrollbar-thumb {
    background-color: var(--primary);
    border-radius: 4px;
}

.equipment-table-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary-dark);
}

.equipment-specs {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.equipment-specs th,
.equipment-specs td {
    padding: 15px 30px;
    text-align: left;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    vertical-align: top;
}

.equipment-specs th {
    background-color: var(--primary);
    color: white;
    font-weight: 500;
}

.equipment-specs tr:nth-child(even) {
    background-color: var(--gray);
}

.equipment-specs tr:hover {
    background-color: var(--light);
}

/* 设置列宽 */
.equipment-specs th:nth-child(1),
.equipment-specs td:nth-child(1) {
    width: 20%;
}

.equipment-specs th:nth-child(2),
.equipment-specs td:nth-child(2) {
    width: 15%;
}

.equipment-specs th:nth-child(3),
.equipment-specs td:nth-child(3) {
    width: 65%;
}               
/* 第一个模块 - 4个卡片样式 */
.four-cards-section {
    margin: 80px 0;
}

.four-cards-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.four-card {
    background: var(--white);
    background: #fafafc;
    border-radius: 10px;
    overflow: hidden;
    /* box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); */
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}



.four-card-image {
    position: relative;
    padding-top: 56.25%; /* 16:9 比例 */
    overflow: hidden;
}

.four-card-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}


.four-card-content {
    padding: 25px 25px 35px 25px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.four-card-content h4 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 15px;
}

.four-card-content p {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 14px;
    flex: 1;
}

/* 第二个模块 - 2个卡片样式 */
.two-cards-section {
    margin: 80px 0;
}

.two-cards-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.two-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.two-card-image {
    position: relative;
    padding-top: 56.25%; /* 16:9 比例 */
    overflow: hidden;
}

.two-card-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.two-card:hover .two-card-image img {
    transform: scale(1.05);
}

.two-card-content {
    padding: 30px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.two-card-content h4 {
    font-size: 20px;
    color: var(--dark);
    margin-bottom: 15px;
}

.two-card-content p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 20px;
}

.two-card-content ul {
    list-style: none;
    margin-top: auto;
}

.two-card-content ul li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.two-card-content ul li i {
    color: var(--accent);
    margin-right: 10px;
    font-size: 18px;
}
/* 更新后的带背景图片的2卡片内容板块样式 */
.two-cards-timeline-section {
    margin: 80px 0;
    padding: 80px 60px;
    border-radius: 10px;
    position: relative;
}

.two-cards-timeline-container {
    overflow-x: auto;
    padding: 20px 0 30px;
    -webkit-overflow-scrolling: touch;
}

.two-cards-timeline-container::-webkit-scrollbar {
    height: 8px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 4px;
}

.two-cards-timeline-container::-webkit-scrollbar-thumb {
    background-color: var(--gray);
    border-radius: 4px;
}

.two-cards-timeline-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary);
}

.two-cards-timeline-list {
    display: flex;
    gap: 30px;
    padding-bottom: 10px;
}

.two-cards-timeline-item {
    min-width: 300px;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(5px);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}



.two-cards-timeline-image {
    width: 100%;
    overflow: hidden;
}

.two-cards-timeline-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}



.two-cards-timeline-content {
    padding: 35px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.two-cards-timeline-content h4 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 15px;
}

.two-cards-timeline-content p {
    color: var(--text);
    line-height: 1.6;

    flex: 1;
    font-size: 14px;
}

.two-cards-timeline-content ul {
    list-style: none;
    margin-top: 15px;
}

.two-cards-timeline-content ul li {
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    color: var(--text);
}

.two-cards-timeline-content ul li i {
    color: var(--accent);
    margin-right: 10px;
    font-size: 16px;
}
/* 视频播放板块样式 */
.video-section {
    margin: 80px 0;
}

.video-preview-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 60px;
}

.video-preview {
    position: relative;
    width: 100%;
    height: 500px;
    background-size: cover;
    background-position: center;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    margin-top: 40px;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.video-preview:hover .video-overlay {
    background: rgba(0, 0, 0, 0.5);
}

.video-play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-play-button:hover {
    background: var(--primary-dark);
    transform: translate(-50%, -50%) scale(1.1);
}

/* 视频弹窗样式 */
.video-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 960px;
    height: 0;
    padding-bottom: 31.58%; /* 6/19 ≈ 31.58% (保持19:6比例) */
    margin: auto;
}
.video-iframe-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 10px;
    overflow: hidden;
}

.video-modal iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 10px;
}

.video-close-btn {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 30px;
    cursor: pointer;
    transition: all 0.3s;
}

.video-close-btn:hover {
    color: var(--accent);
}


/* 响应式设计 */
@media (max-width: 1680px){
    .main-content{
        padding: 60px 60px 0px 60px;
    }
    .banner{
        height: 500px;
    }
    .two-cards-timeline-content{
        padding: 25px 25px 35px 25px;
    }
}

@media (min-width: 992px) {
    .timeline-list {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
        padding-bottom: 0;
    }
    
    .timeline-item {
        min-width: auto;
    }
    
    .timeline-container {
        overflow-x: visible;
    }
    

    .highlights-container {
        grid-template-columns: repeat(2, 1fr);
    } 
    .four-cards-container {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .two-cards-container {
      
        gap: 20px;
    }
    .two-cards-timeline-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
        padding-bottom: 0;
    }
    .two-cards-timeline-list-4{
        grid-template-columns: repeat(4, 1fr);
    }
    
    .two-cards-timeline-item {
        min-width: auto;
    }
    
    .two-cards-timeline-container {
        overflow-x: visible;
    }
}

@media (max-width: 1200px) {
    .header-container,
    .banner-content,
    .main-content,
    .footer-container {
        padding: 0 40px;
    }
    
    .banner {
        height: 500px;
    }
    
    .banner-content h1 {
        font-size: 42px;
    }
    
    .banner-content p {
        font-size: 18px;
    }
    
    .company-intro {
        flex-direction: column;
    }
    
    .company-image {
        width: 100%;
        margin-top: 30px;
    }
    
    .mv-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .stat-item {
        min-width: 150px;
        padding: 25px 30px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .case-card {
        gap: 30px;
    }
    
    .case-content {
        padding: 30px;
    }
    .four-cards-container {
        gap: 20px;
    }
    
    .four-card-content {
        padding: 20px;
    }
    
    .two-card-content {
        padding: 25px;
    }
    .two-cards-timeline-section {
        padding: 60px 40px;
    }
    .video-preview-container {
        padding: 0 40px;
    }
    
    .video-preview {
        height: 400px;
    }
    .main-content{
        padding: 30px 60px 0px 60px;
    }
}

@media (max-width: 768px) {
    .header-container,
    .banner-content,
    .main-content,
    .footer-container {
        padding: 0 30px;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    nav ul {
        display: none;
        position: absolute;
        top: 100%; /* 改为从header底部开始 */
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.95); /* 与桌面端滚动后一致 */
        flex-direction: column;
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        padding: 20px 0;
        margin-top: 0;
        border-radius: 0 0 10px 10px; /* 添加圆角 */
        margin-top: 14px;
        backdrop-filter: blur(20px);
    }
    
    nav ul.show {
        display: flex;
    }
    
    nav ul li {
        margin: 0;
        text-align: center;
    }
    
    nav ul li a {
        display: block;
        padding: 15px 0;
        color: var(--text); /* 与桌面端滚动后一致 */
        font-weight: 500;
    }
    
    nav ul li a:hover,
    nav ul li a.active {
        color: var(--primary); /* 悬停和激活状态颜色 */
    }
    
    nav ul li a:after {
        content: '';
        position: absolute;
        bottom: 10px; /* 调整位置 */
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 2px;
        background: var(--primary);
        transition: width 0.3s;
        
        
    }
    
    nav ul li a:hover:after,
    nav ul li a.active:after {
        width: 40px; /* 控制下划线长度 */
    }
    
    header.scrolled nav ul li a {
        color: var(--text);
    }
    
    .banner {
        height: 400px;
        background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/about-banner-m.jpg') no-repeat center center;
        background-size: cover;
    }
    
    .banner-content h1 {
        font-size: 36px;
    }
    
    .banner-content p {
        font-size: 16px;
    }
    .banner-case{
        background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/case-banner-m.jpg') no-repeat center center;
        background-size: cover;
    }
    .banner-technology{
        background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/technology-banner-m.jpg') no-repeat center center;
        background-size: cover;
    }
    .banner-value{
        background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/value-banner-m.jpg') no-repeat center center;
        background-size: cover;
    }
    .banner-jxq{
        background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), url('../img/jxq-banner-m.jpg') no-repeat center center;
        background-size: cover;
    }
    
    .section-title h2 {
        font-size: 30px;
    }
    
    .mv-grid {
        grid-template-columns: 1fr;
    }
    
    .mv-card {
        height: auto;
    }
   
    /* 隐藏第二行的第一个图片卡片 */
    .mv-grid .mv-card.image.hide-on-mobile {
        display: none;
    }
    
    .timeline-section {
        padding: 60px 30px;
    }
    .contact-grid {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    .qr-code {
        padding: 10px;
    }
    
    .qr-code img {
        width: 120px;
        height: 120px;
    }
    .logo img{
        height: 32px;
    }
    .stats-overlay {
        padding: 60px 20px;
    }
    
    .stats-container {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    .stats-banner{
        margin: 20px 0px;
    }
    .stat-item {
        min-width: 80px;
        padding: 10px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .case-card,
    .case-card.reverse {
        flex-direction: column;
    }
    
    .case-image {
        width: 100%;
        min-height: 200px;
    }
    .highlight-item {
        grid-template-columns: repeat(2, 1fr);
     
        align-items: center;
        text-align: left;
        padding: 25px;
    }
    
    .highlight-image {
        margin-bottom: 15px;
    }
    
    .highlights-container {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .four-cards-container {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .four-card {
        max-width: 100%;
    }
    
    .two-card-content {
        padding: 20px;
    }
    .two-cards-timeline-section {
        padding: 60px 30px;
    }
    
    .two-cards-timeline-list {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .two-cards-timeline-image {
        height: 180px;
    }
    .video-preview-container {
        padding: 0 30px;
    }
    
    .video-preview {
        height: 300px;
    }
    
    .video-play-button {
        width: 60px;
        height: 60px;
        font-size: 20px;
    }
    
    .video-modal-content {
        width: 90%;
    }
 }

@media (max-width: 480px) {
    .header-container,
    .banner-content,
    .main-content,
    .footer-container {
        padding: 0 20px;
    }
    
    .banner {
        height: 350px;
    }
    
    .banner-content h1 {
        font-size: 30px;
    }
    
    .section-title h2 {
        font-size: 24px;
    }
    
    .main-content {
        padding: 30px 20px;
    }
    .stats-overlay {
        padding: 20px 15px;
    }
    .company-intro{
        gap: 0px;
    }
    .stat-number {
        font-size: 32px;
    }
    
    .stat-label {
        font-size: 16px;
    }
    
    .case-content {
        padding: 25px;
        padding-top: 0px;
    }
    .case-content h3{
        font-size: 18px;
    }
    .case-content p{
        font-size: 12px;
    }
    .tag{
        font-size: 12px;
    }
    .four-card-content,
    .two-card-content {
        padding: 24px;
    }
    
    .four-card-content h4 {
        font-size: 16px;
    }
    
    .two-card-content h4 {
        font-size: 18px;
    }
    .two-cards-timeline-section {
        padding: 40px 20px;
    }
    
    .two-cards-timeline-content {
        padding: 20px;
    }
    
    .two-cards-timeline-content h4 {
        font-size: 18px;
    }
    .video-preview-container {
        padding: 0 20px;
    }
    
    .video-preview {
        height: 250px;
    }
    
    .video-play-button {
        width: 50px;
        height: 50px;
        font-size: 18px;
    }
    
    .video-close-btn {
        top: -30px;
        font-size: 24px;
    }
    .mission-vision{
        margin: 40px 0px;
    }
    .company-intro{
        margin-bottom: 40px;
    }
    .timeline-section{
        margin-bottom: 0px;
    }
    .two-cards-timeline-content p{
        font-size: 12px;
    }
    .equipment-specs th, .equipment-specs td{
        font-size: 12px;
    }
    .section-title p{
        font-size: 16px;
        margin-top: 10px;;
    }
    .section-title{
        margin-bottom: 20px;
    }
    .four-card-content p{
        font-size: 12px;
    }
    .company-info p{
        font-size: 14px;
    }
    .timeline-content ul li{
        font-size: 14px;
        padding: 5px 0px;
    }
    nav ul li a:after{
        display: none;
    }
    footer{
        padding-top: 30px;
    }
    .footer-container {
        margin: 0 auto;
        padding: 0 24px;
        display: grid;
        grid-template-columns: none;
        gap: 0px;
    }
    .footer-column,.contact-qr{
        grid-column:none;
    }
    .mv-grid{
        gap: 10px;
        margin-top: 20px;
    }
    .mv-card.content{
        grid-template-columns:20% 80%;
        display: grid;
        padding: 20px 30px;
    }
    .mv-card i{
        font-size: 40px;
        align-self: center;
        margin-bottom: 0;
    }
    .mv-card h4{
        font-size: 18px;
        margin-bottom: 2px;
    }
    .mv-card p{
        font-size: 15px;
    }
    .copyright{
        margin-top: 20px;
        padding-top: 20px;
        margin-bottom: 24px;
    }
    /* 设置列宽 */
    .equipment-specs th:nth-child(1),
    .equipment-specs td:nth-child(1) {
        width: 21%;
        align-self: center; 
        
        
    }

    .equipment-specs th:nth-child(2),
    .equipment-specs td:nth-child(2) {
        width: 15%;
    }

    .equipment-specs th:nth-child(3),
    .equipment-specs td:nth-child(3) {
        width: 64%;
    }           
    .equipment-specs th, .equipment-specs td{
        padding: 12px 10px;
    }
    .equipment-table-container{
        margin: 0px 0px;
        padding: 10px 0px 15px;
    }
    .equipment-section{
        margin: 40px 0px;
    }
    .highlight-content h4{
        font-size: 16px;
        margin-bottom: 2px;
    }
    .highlight-content p{
        font-size: 12px;
    }
    .highlight-image{
        margin-bottom: 0px;
    }
    .margin-t0{
        margin-top: 0px;
    }
    .four-cards-section{
        margin: 40px 0px;
    }
    .case-card{
        gap:15px;
        margin-bottom: 16px;
    }
    .margin-t-0{
        margin-top: 0px;
    }
    .margin-b-0{
        margin-bottom: 0px;
    }
    .two-cards-timeline-section{
        margin: 40px 0px;
    }
    .timeline-section{
        margin-top: 40px;
    }
    .company-image{
        margin-top: 10px;
    }
    .copyright a{
        padding-left: 0;
        padding-top: 4px;
        padding-bottom: 10px;
    }
}