:root {
    --primary-blue: #007aff;
    --dark-bg: #f9f9f9;
    --tech-border: #e5e5e5;
    --accent-cyan: #007aff;
    --text-color: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'SF Pro Display', '微软雅黑', sans-serif;
}

body {
    background: var(--dark-bg);
    color: var(--text-color);
}

body::selection {
    background-color: var(--accent-cyan);
    color: white;
}

/* 增强导航栏 */
.nav-bar {
    display: flex;
    justify-content: space-between;
    padding: 15px 8%;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--tech-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
    /* 增加玻璃质感阴影 */
    background: rgba(255, 255, 255, 0.98);
    /* 更通透的毛玻璃效果 */
}

.nav-items {
    display: flex;
    gap: 40px 20px;
    align-items: center;
}

.nav-items a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.95em;
    position: relative;
    padding-bottom: 5px;
}

.nav-items a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-cyan);
    transition: width 0.3s;
}

.nav-items a:hover::after {
    width: 100%;
}

.nav-items1,
.nav-items2,
.nav-items3 {
    display: flex;
    gap: 0 8px;
    align-items: center;
}

.icon-xinxi,
.icon-lianxiren,
.icon-caidan {
    display: none;
    font-size: 1.2em;
    cursor: pointer;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: 25px;
}

.search-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-bar input {
    padding: 8px 20px;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid var(--tech-border);
    color: var(--text-color);
    border-radius: 20px;
    width: 200px;
    transition: all 0.3s;
    margin-right: 0px;
}

.search-bar input:focus {
    outline: none;
    box-shadow: 0 0 8px rgba(0, 122, 255, 0.4);
}

.search-icon {
    background: var(--accent-cyan);
    /* 使用主题色 */
    color: white;
    border: none;
    border-radius: 15px;
    padding: 8px 12px;
    font-size: 0.8em;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 2;
}

.search-icon:hover {
    background: #0066cc
}

.company-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-left: 25px;
    position: relative;
}

/* 添加分隔线 */
.company-brand::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 24px;
    width: 1px;
    background: linear-gradient(transparent 10%, #007aff 50%, transparent 90%);
}

.brand-logo {
    height: 32px;
    width: auto;
    filter: drop-shadow(0 2px 4px rgba(0, 122, 255, 0.3));
}

.company-name {
    font-family: 'SF Pro Display', '微软雅黑', sans-serif;
    font-size: 16px;
    background: linear-gradient(45deg, #007aff, #00bfff);
    background-clip: text;
    color: transparent;
    font-weight: 600;
}

.company-name a {
    text-decoration: none;
    color: var(--accent-cyan);
}


/* 动态周年横幅 */
.centennial-banner {
    height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    animation: gradientFlow 15s infinite alternate;
    /* 背景流动动画 */
    background-size: cover;
    position: relative;
    overflow: hidden;
}

/* @keyframes gradientFlow {
		    0% { background-position: 0% 50%; }
		    100% { background-position: 100% 50%; }
		} */
.back-video {
    width: 100%;
}

.backVideo {
    width: 100%;
    height: 100%;
    display: block;
}

.centennial-banner::before {
    content: 'CWT  Valve';
    position: absolute;
    width: 100%;
    text-align: center;
    top: 40%;
    transform: translateY(-50%);
    font-size: 12em;
    color: rgba(255, 255, 255, 0.013);
    font-weight: bold;
    z-index: 0;
    opacity: 0.2;
    /* 或使用 filter 增强整体质感 */
    filter: contrast(120%) saturate(150%);
    text-shadow:
        2px 2px 0 rgba(0, 0, 0, 0.2),
        /* 右下阴影 */
        -2px -2px 0 rgba(255, 255, 255, 0.2),
        /* 左上高光 */
        4px 4px 10px rgba(0, 0, 0, 0.3);
    /* 模糊阴影增强立体感 */

}

/* 弹幕容器 */
.danmu-container {
    position: absolute;
    top: 2%;
    /* 调整顶部位置，使其位于横幅上半部分 */
    left: 0;
    width: 100%;
    height: 25%;
    /* 可根据需要调整高度 */
    background: transparent;
    /* 添加半透明背景 */
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.daziji {
    color: white;
    text-align: center;
}

.mark {
    border-right: 2px solid white;
    animation: blink 0.6s step-end infinite;
}

@keyframes blink {

    from,
    to {
        border-color: transparent;
    }

    50% {
        border-color: white;
    }
}

.banner-content {
    position: absolute;
    bottom: 30px;
}

.banner-titles {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0px;
    /* 调整 h1 和 h2 之间的间距 */
    /* margin-top: 370px; */
}

.banner-titles h1 {
    font-size: 3em;
    margin-bottom: 15px;
    letter-spacing: 2px;
    color: white;
    text-shadow: 0 4px 20px rgba(0, 122, 255, 0.15);
    /* 立体文字阴影 */
    animation: textFloat 3s ease-in-out infinite;
}

@keyframes textFloat {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }
}

.banner-titles h2 {
    font-size: 1.8em;
    color: white;
    margin-bottom: 25px;
}

/* 新增探索按钮样式 */
.explore-button {
    background: var(--accent-cyan);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 8px rgba(0, 122, 255, 0.2);
}

.explore-button a {
    text-decoration: none;
    color: white;
}

.explore-button:hover {
    background: #0066cc;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 122, 255, 0.3);
}

/* 新增按钮样式 */
.new-button {
    background: white(--accent-cyan);
    color: var(--accent-cyan);
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 8px rgba(0, 122, 255, 0.2),
        inset 0 0 0 2px rgba(0, 122, 255, 0.8);
    /* 与探索按钮保持一定间距 */
    margin-left: 15px;
}

.new-button:hover {
    background: rgba(250, 250, 252, 0.85);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 122, 255, 0.3),
        inset 0 0 0 2px rgba(0, 102, 204, 0.8);
}

/* 调整按钮容器样式，确保按钮水平排列 */
.button-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 精确解决方案网格 */
.solution-grid {
    display: grid;
    grid-template-rows: auto 1fr;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    padding: 80px 8%;
    background-color: white;
}

/* 让标题跨列显示在所有卡片上方 */
.solution-grid .section-title {
    grid-column: 1 / -1;
}

.solution-card {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s;
    border: 1px solid var(--tech-border);
    position: relative;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card-image {
    aspect-ratio: 16 / 9;
    width: 100%;
    display: block;
    background: #f5f5f5;
    position: relative;
    overflow: hidden;
}

.card-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg,
            rgba(0, 122, 255, 0.1),
            transparent);
}

.card-content {
    padding: 15px 25px;
}

.card-content h3 {
    color: var(--accent-cyan);
    font-size: 1.1em;
}

.card-content p {
    color: #666;
    font-size: 0.95em;
    line-height: 1.6;
}

.del {
    font-size: 0.8em;
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color 0.3s ease, background-color 0.3s ease;
}

.del:hover {
    color: black;
}


/* 摄影教程专区 */
.photography-section {
    padding: 80px 8%;
}

.section-title {
    font-size: 2em;
    margin-bottom: 40px;
    padding-left: 20px;
    border-left: 4px solid var(--accent-cyan);
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 35px;
}

.tutorial-card {
    background: #fff;
    border-radius: 16px;
    padding: 25px;
    border: 1px solid var(--tech-border);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.tutorial-date {
    color: var(--accent-cyan);
    font-size: 0.9em;
    margin: 15px 0;
}

.tutorial-card p {
    color: #666;
    line-height: 1.8;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    line-clamp: 3;
    /*限制最大显示3行*/
    overflow: hidden;
}

/* 精确统计数据 */
.stats-panel {
    background: #f0f0f0;
    padding: 100px 8%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
    border-top: 2px solid var(--tech-border);
}

.stat-number {
    font-size: 3em;
    color: var(--accent-cyan);
    font-weight: 300;
    margin-bottom: 10px;
    position: relative;
    display: inline-block;
}

.stat-item {
    position: relative;
    padding: 30px;
    background: rgba(0, 122, 255, 0.03);
    border-radius: 16px;
}

.stat-item p {
    font-size: 2em;
}

.stat-number::after {
    content: '+';
    color: rgba(0, 122, 255, 0.3);
    font-size: 0.6em;
    top: -0.4em;
}

/* 增强页脚 */
footer {
    background: #eaeaea;
    padding: 60px 8%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    border-top: 1px solid var(--tech-border);
}

.contact-info {
    line-height: 1.8;
    color: #666;
}

.copyright {
    text-align: right;
    color: #999;
    align-self: end;
}


/* 新增弹窗样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: #fff;
    width: 60%;
    max-width: 1500px;
    border-radius: 16px;
    padding: 30px;
    position: relative;
    border: 1px solid var(--tech-border);
    transform: scale(0.8);
    opacity: 0;
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
    /* 缩短时间并优化动画曲线 */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    background: linear-gradient(145deg,
            rgba(255, 255, 255, 0.98) 0%,
            rgba(245, 248, 255, 0.98) 100%);
    backdrop-filter: blur(20px);
    /* 玻璃材质效果 */
    border: 1px solid rgba(0, 122, 255, 0.15);
}

.modal-active .modal-content {
    transform: scale(1);
    opacity: 1;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-close {
    cursor: pointer;
    font-size: 24px;
    color: #666;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--accent-cyan);
}

.modal-body {
    max-height: 70vh;
    overflow-y: auto;
    line-height: 1.8;
    color: #666;
    padding: 20px;
}

.modal-body::-webkit-scrollbar {
    width: 6px;
    background: rgba(0, 0, 0, 0.05);
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--accent-cyan);
    border-radius: 4px;
}

.modal-image {
    width: 100%;
    /* 让图片宽度自适应容器 */
    height: auto;
    /* 保持图片的宽高比 */
    display: block;
    /* 确保图片作为块级元素显示 */
    margin-top: 15px;
    /* 可根据需要调整图片与上方元素的间距 */
}

/* 优化模态框内容样式 */


.modal-body h4 {
    color: var(--accent-cyan);
    margin: 20px 0 15px;
    font-size: 1.4em;
}

.modal-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.modal-body table th,
.modal-body table td {
    border: 1px solid #e5e5e5;
    padding: 10px;
    text-align: center;
}

.modal-body ul {
    padding-left: 20px;
    margin: 15px 0;
}

.modal-body img {
    border-radius: 12px;
    margin: 20px 0;
    max-width: 100%;
    height: auto;
}

/* 弹窗分栏布局 */
.modal-columns {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: start;
}

.modal-media {
    position: sticky;
    top: 20px;
    display: grid;
    gap: 20px;
}


/* 下载按钮容器 */
.modal-downloads {
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    border-top: 1px solid #e5f0ff;
    padding: 20px;
}

.back {
    width: 100%;
    height: 300px;
    background-image: url(image/公司简介.jpg);
    background-size: cover;
    position: relative;
}

.back::after {
    content: "公司简介";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 38px;
}

/* 为卡片添加点击效果 */
.card-image {
    cursor: pointer;
    transition: transform 0.3s;
}

.card-image:hover {
    transform: scale(1.02);
}

/* 布局样式 */
.header-controls {
    display: flex;
    align-items: center;
    gap: 25px;
    margin-left: auto;
    /* 右侧对齐 */
}


/* 新增产品中心样式 */
.product-center {
    padding: 80px 8%;
}

.filter-controls {
    display: flex;
    justify-content: center;
    position: relative;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.list {
    float: left;
    width: 100px;
    height: 40px;
    list-style-type: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.valve-img {
    width: 80px;
    display: inline-block;
    margin-bottom: 0;
    transition: transform 0.3s ease;
}

/* 优化筛选按钮 */
.filter-btn1,
.filter-btn2,
.filter-btn3 {
    background: #fff;
    border: none;
    width: 100px;
    line-height: 40px;
    transition: all 0.3s ease;
}

.filter-btn {
    background: var(--dark-bg);
    border: none;
    width: 200px;
    line-height: 20px;
    transition: all 0.3s ease;
    padding: 0 50px;
}

.list button {
    display: block;
}

.filter-btn {
    display: none;
    /* 默认隐藏所有.filter-btn类按钮 */
}

.filter-btn1,
.filter-btn2,
.filter-btn3 {
    display: block;
    /* 默认显示产品 和 系统 按钮 */
}


.filter-btn:hover {
    color: #0066cc;
}

.filter-btn:hover .valve-img {
    transform: scale(1.1);
}

.filter-btn1:hover,
.filter-btn2:hover,
.filter-btn3:hover {
    background: black;
    color: #fff;
}


.filter-btn.active {
    color: #0066cc;
}

.filter-btn1.active,
.filter-btn2.active,
.filter-btn3.active {
    background: black;
    color: #fff;
}

.product-grid {
    background-color: var(--dark-bg);
    padding: 20px;
}

.product-card {
    background: #fff;
    border: none;
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s;
    margin-bottom: 20px;
    min-height: 400px;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 122, 255, 0.1);
    border-color: var(--accent-cyan);
}

.product-card.luowen {
    display: flex;
    text-align: center;
    align-items: center;
    justify-content: center;
    gap: 100px;
}

.product-image {
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
}

.product-grid1 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.product-grid2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.product-grid3 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.product-img {
    width: 240px;
}

.product-img1 {
    width: 338px;
}

.product-info {
    padding: 20px;
    position: relative;
    min-height: 120px;
    text-align: center;
}

.product-info1 {
    padding: 20px;
    min-height: 120px;
    text-align: center;
}

.product-info p,
.product-info1 p {
    font-size: 1em;
}

.product-info a,
.product-info1 a {
    text-decoration: none;
}

.product-info h3,
.product-info1 h3 {
    font-size: 20px;
    color: black;

}

.product-name {
    display: inline-block;
    font-size: 20px;
    margin-bottom: 16px;
}

.product-info span,
.product-info1 span {
    display: inline-block;
    color: black;
    font-size: 0.9em;
    margin-right: 10px;
}

.product-info1 .hhh {
    font-size: 28px;
}

.names {
    display: inline-block;
    text-decoration: none;
}

.product-category {
    color: var(--accent-cyan);
    font-size: 0.9em;
    margin-bottom: 16px;
}

.product-model {
    color: #999;
    font-size: 0.7em;
    margin-bottom: 12px;
}

.tech-tags {
    margin-top: 15px;
}

.tech-tags span {
    display: inline-block;
    background: rgba(0, 122, 255, 0.1);
    color: var(--accent-cyan);
    padding: 4px 12px;
    border-radius: 20px;
    margin-right: 8px;
    font-size: 0.9em;
}

.tech-features li {
    padding: 10px 15px;
    margin: 8px 0;
    background: #f8faff;
    border-left: 3px solid var(--accent-cyan);
    display: flex;
    align-items: center;
}

.icon {
    color: var(--accent-cyan);
    margin-right: 12px;
    font-weight: bold;
}

.application-notes {
    margin-top: 30px;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 12px;
    grid-column: 1 / -1;
}

/* 基础按钮样式 */
.download-btn {
    display: flex;
    align-items: center;
    padding: 18px 25px;
    border-radius: 12px;
    background: linear-gradient(135deg, #007aff, #00a8ff);
    color: white !important;
    text-decoration: none !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(0, 122, 255, 0.15);
    position: relative;
    overflow: hidden;
}

/* DWG图纸按钮特殊样式 */
.download-btn.dwg {
    background: linear-gradient(135deg, #4CAF50, #66BB6A);
}

/* 悬停效果 */
.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 122, 255, 0.25);
}

/* 图标动画 */
.download-btn .icon {
    font-size: 1.4em;
    margin-right: 15px;
    transition: transform 0.3s;
}

.download-btn:hover .icon {
    transform: translateY(-2px);
}

/* 文件大小标注 */
.filesize {
    margin-left: auto;
    font-size: 0.9em;
    opacity: 0.8;
    padding-left: 15px;
}

/* 按钮流光效果 */
.download-btn::after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg,
            transparent 25%,
            rgba(255, 255, 255, 0.1) 50%,
            transparent 75%);
    transform: rotate(45deg);
    animation: buttonShine 3s infinite linear;
}

@keyframes buttonShine {
    0% {
        transform: translateX(-100%) rotate(45deg);
    }

    100% {
        transform: translateX(100%) rotate(45deg);
    }
}

.category-title {
    font-size: 1.5em;
    margin-top: 40px;
    margin-bottom: 20px;
    padding-left: 20px;
    border-left: 4px solid var(--accent-cyan);
}

.pdf {
    text-decoration: none;
}

/* 懒加载 */
.flag {
    opacity: 0;
    filter: blur(5px);
    transition: all 0.4s;
    transform: translateY(100%);
}

.active {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
}

/* 移动端优化 */

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

    .solution-grid,
    .tutorial-grid {
        gap: 10px;
        grid-template-columns: 1fr;
    }

    .nav-bar {
        flex-direction: row;
        /* 改为行排列 */
        flex-wrap: wrap;
        /* 允许换行 */
        align-items: center;
        padding: 10px;
    }

    /* 使两个nav-items容器同行显示 */
    .nav-items {
        display: flex;
        gap: 40px;
    }

    .nav-items.active {
        display: flex;
        /* 显示导航菜单 */
    }

    /* 调整导航项样式 */
    .nav-items a {
        font-size: 0.75em;
    }

    /* 隐藏桌面端导航文字 */
    .dropdown-menu,
    .fengexian {
        display: none;
    }

    /* 显示图标并调整布局 */
    .icon-xinxi,
    .icon-lianxiren,
    .icon-caidan {
        display: inline-block;
        position: relative;
        /* 为下拉菜单定位做准备 */
    }

    /* 下拉菜单样式 */
    .dropdown-content {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        background: white;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        border-radius: 8px;
        z-index: 200;
        min-width: 80px;
    }

    /* 不同菜单的定位调整 */
    .nav-items3 .dropdown-content {
        left: 100px;
    }

    .nav-items2 .dropdown-content {
        left: 30px;
    }

    /* Motion定位调整 */
    .nav-items>a[href="#"] {
        font-size: 0.8em;
        padding-top: 5px;
    }

    .dropdown-item {
        display: block;
        padding: 12px 16px;
        color: var(--text-color);
        text-decoration: none;
        transition: background 0.2s;
    }

    .dropdown-item:hover {
        background: rgba(0, 122, 255, 0.05);
    }

    /* 菜单激活状态 */
    .icon-caidan.active,
    .icon-xinxi.active,
    .icon-lianxiren.active {
        color: var(--accent-cyan);
    }

    /* 调整搜索栏位置 */
    .search-bar {
        order: -1;
        /* 移到最前面 */
        width: 100%;
        margin-bottom: 10px;
    }

    .search-bar {
        gap: 15px 8px;
        font-size: 0.2em;
    }

    .search-bar input {
        width: 90px;
        padding: 6px 10px;
        font-size: 11px;
    }

    .search-icon {
        padding: 6px 10px;
        font-size: 11px;
    }

    .company-name {
        font-size: 0.75em;
    }

    .download-btn {
        flex-direction: column;
        text-align: center;
        padding: 5px;
        font-size: 0.8em;
    }

    .download-btn .icon {
        margin: 0 0 10px 0;
    }

    .filesize {
        margin: 10px 0 0 0;
        padding-left: 0;
    }

    .modal-columns {
        grid-template-columns: 1fr;
    }

    .modal-media {
        position: static;
        order: -1;
    }

    .brand-logo {
        height: 20px;
    }

    .product-card.luowen {
        gap: 0px;
    }

    .product-image1 {
        width: 100px;
    }

    .stat-item {
        padding: 5px;
        border-radius: 10px;
    }

    .stat-number {
        font-size: 1em;
    }

    .stat-item p {
        font-size: 0.7em;
    }

    .centennial-banner {
        height: auto;
    }

    .centennial-banner::before {
        font-size: 3em;
    }

    .banner-content {
        position: absolute;
        bottom: 10px;
    }

    .banner-titles {
        margin-top: 270px;
    }

    .banner-titles h1 {
        font-size: 1.2em;
        margin-bottom: 0px;
    }

    .banner-titles h2 {
        font-size: 0.6em;
        margin-bottom: 0px;
    }

    .button-container {
        margin-top: 15px;
    }

    .explore-button {
        font-size: 0.6em;
        padding: 6px 14px;
    }

    .new-button {
        font-size: 0.6em;
        padding: 6px 20px;
    }

    footer {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .contact-info {
        font-size: 0.8em;
        text-align: center;
    }

    .copyright {
        font-size: 0.8em;
        text-align: center;
    }

    .daziji {
        font-size: 1em;
        text-align: center;
    }

    .product-info p {
        font-size: 0.9em;
    }

    .product-info {
        min-height: 120px;
    }

    .product-info1 .hhh {
        font-size: 14px;
    }

    .dropdown-menu,
    .fengexian {
        display: none;
    }

    .section-title {
        font-size: 1.5em;
        margin-bottom: 40px;
        padding-left: 20px;
        border-left: 4px solid var(--accent-cyan);
    }

    .product-category {
        font-size: 0.7em;
        margin-bottom: 10px;
    }

    .product-info h3 {
        font-size: 0.85em;
    }

    .product-img {
        width: 100px;
    }

    .category-title {
        font-size: 1.3em;
    }

    .back {
        height: 100px;
    }

    .back::after {
        font-size: 1em;
    }

    .modal-downloads {
        margin-top: 10px;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 5px;
        border-top: 1px solid #e5f0ff;
        padding: 5px;
    }

    .modal-body {
        padding: 5px;
        font-size: 0.9em;
    }

    .modal-body p {
        font-size: 0.85em;
    }

    .modal-body h2 {
        font-size: 1.1em;
    }

    .modal-header h3 {
        font-size: 1em;
    }

    .valve-img {
        width: 50px;
    }

    .filter-btn {
        font-size: 11px;
        width: 100px;
        padding: 5px 15px;
    }

    .product-card {
        display: flex;
        text-align: center;
        justify-content: center;
        align-items: center;
        min-height: 100px;
    }

    .product-grid1 {
        grid-template-columns: 1fr;
        gap: 0px;
    }

    .hhh1 {
        display: none;
    }

    .names span {
        font-size: 12px;
    }

    .names a span {
        font-size: 12px;
    }

    .product-name {
        margin-bottom: 10px;
    }

    .product-name h3 {
        font-size: 14px;
    }

    .product-grid2 {
        grid-template-columns: 1fr;
        gap: 0px;
    }

    .product-grid3 {
        grid-template-columns: 1fr;
        gap: 0px;
    }

    .product-center,
    .solution-grid,
    .photography-section {
        padding: 40px 8%;
    }

    .stats-panel {
        padding: 50px 8%;
    }

    .modal-content {
        width: 90%;
    }
}

/*平板*/
@media screen and (min-width:768px) and (max-width:1024px) {

    .nav-bar {
        flex-direction: column;
        gap: 20px;
    }

    .nav-items {
        display: flex;
        gap: 30px;
        align-items: center;
    }

    .solution-grid {
        gap: 20px;
        grid-template-columns: repeat(2, 1fr);
    }

    .tutorial-grid {
        gap: 20px;
        grid-template-columns: repeat(2, 1fr);
    }

    .product-img {
        width: 150px;
        margin-top: 15px;
    }

    .product-img1 {
        width: 180px;
        margin-top: 0px;
    }

    .product-info h3 {
        font-size: 0.9em;
    }

    .product-card {
        min-height: 250px;
    }

    .product-card.luowen {
        gap: 10px;
    }

    .product-info1 .hhh {
        font-size: 20px;
    }

    .product-category {
        font-size: 0.8em;
    }

    .product-image {
        height: 140px;
    }

    .stat-number {
        font-size: 2em;
    }

    .stat-item p {
        font-size: 1.3em;
    }

    .centennial-banner::before {
        font-size: 7.5em;
    }

    .banner-titles {
        margin-top: 400px;
    }

    .banner-titles h1 {
        font-size: 4em;
        margin-bottom: 10px;
    }

    .banner-titles h2 {
        font-size: 1.6em;
        margin-bottom: 15px;
    }

    .button-container {
        margin-top: 20px;
    }

    .explore-button {
        font-size: 0.9em;
        padding: 8px 20px;
    }

    .new-button {
        font-size: 0.9em;
        padding: 8px 20px;
    }

    footer {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .contact-info {
        font-size: 1.4em;
        text-align: center;
    }

    .copyright {
        font-size: 1.4em;
        text-align: center;
    }

    .daziji {
        font-size: 2em;
        text-align: center;
    }

    .filter-btn {
        padding: 5px 20px;
    }
}