/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    /* 平滑滚动过渡 */
    scroll-padding-top: 0;
    /* 消除滚动偏移 */
}

body,
html {
    font-family: "Microsoft Yahei", sans-serif;
    background-color: transparent;
}

#app {
    position: relative;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    color: #000F2F;
    font-size: 16px;
    padding-top: 680px;
}

#app>* {
    max-width: 1200px;
}

#app.s1 {
    padding-top: 680px;
    transition: padding-top 1s ease;
}

#app.s2 {
    padding-top: 0px;
    transition: padding-top 1s ease;
}

input,
textarea {
    margin: 0;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    /* 强制统一字体、字号、行高 */
    font-family: "Microsoft Yahei", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #333;
    outline: none;
    box-sizing: border-box;
}

/* 统一 placeholder 颜色+字体 */
input::placeholder,
textarea::placeholder {
    color: #999;
    font-size: 14px;
    font-family: inherit;
    /* 继承上面统一的字体 */
    opacity: 1;
}

/* 去掉 textarea 右下角拖拽，避免布局乱掉 */
textarea {
    resize: none;
}

.header-nav {
    width: 100%;
    height: 60px;
    position: fixed;
    top: 0;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0;
    z-index: 999999;
    gap: 39px;
}

.nav-top-scr {
    position: absolute !important;
    top: 0;
    left: 0;
}

.nav-abs-scr {
    position: absolute !important;
    top: 0;
    left: 0;
}

.nav-non-scr {
    display: none !important;
}

.header-nav.nav-scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0px 8px 15px 0px rgba(142, 142, 142, 0.25);
}

/* 头部左侧区域（< 返回 + logo） */
.nav-left {
    margin-left: 47px;
    /* 距离左边距56px */
    display: flex;
    align-items: center;
    gap: 28px;
    /* 元素间距33px */
}

.back-btn {
    font-size: 13px;
    color: #000F2F;
    text-decoration: none;
    cursor: pointer;
    display: inline-block;
    line-height: 29px;
    width: 53px;
    text-align: center;
}

.back-btn:hover {
    background: #EBEBEB;
    border-radius: 6px;
}


.logo-img {
    width: 121px;
    height: 42px;
    /* 替换为你的logo图片地址 */
    background: url('../images/logo.png') no-repeat center;
    background-size: 100% 100%;
}

/* 头部中间导航 */
.nav-middle {
    width: 453px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin-left: 53px;
}

.nav-item {
    font-size: 13px;
    font-weight: bold;
    color: #000F2F;
    font-family: "SimHei", "黑体";
    /* 黑体 */
    text-decoration: none;
    cursor: pointer;
    position: relative;
    display: inline-block;
}

.nav-item:hover {
    color: #0F218B;

}

.nav-item:hover::after {
    content: "";
    position: absolute;
    /* 下划线距离文字下方8px */
    bottom: -7px;
    left: 0;
    width: 100%;
    /* 下划线高度2px */
    height: 2px;
    /* 下划线颜色和文字一致（也可单独指定） */
    background-color: #0F218B;
    /* 保证下划线层级不遮挡其他元素 */
    z-index: 1;
}

/* 头部右侧下载按钮 */
.nav-right {
    margin-right: 39px;
    /* 距离页面右边47px */
}

.m-nav-menu {
    display: none;
    background: url("../images/m-nav-menu.png") no-repeat center;
    background-size: 100% 100%;
    width: 33px;
    height: 27px;
}

.header-nav .download-btn {
    display: block;
    width: 168px;
    height: 39px;
    /* 替换为你的下载按钮图片地址 */
    background: url('../images/download-btn.png') no-repeat center;
    background-size: 100% 100%;
    border: 0px;
    /* 临时占位，替换图片后删除 */
    cursor: pointer;
    border-radius: 4px;

    transform: translateY(0);
    box-shadow: none;
    transition: box-shadow 0.5s ease, transform 0.5s ease;
}

.header-nav .download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 3px 20px rgba(0, 0, 0, 0.4);
    transition: box-shadow 0.5s ease, transform 0.5s ease;
}

/* 栏目通用样式：100vh高度 + 无间距 */
.section {
    width: 100%;
    margin: 0 !important;
    padding: 67px 0;
    position: relative;
    /* z-index: 10; */
    /* 背景图铺满容器，保持比例 */
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    overflow: hidden;
}

.section>* {
    max-width: 100%;
}

/* 1440px设计图适配容器 */
.section-inner {
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    position: relative;
    padding: 0 28px;
    /* background: url("../images/bg.png") no-repeat center;
    background-size: 1440px auto; */

    /* 小屏幕适配 */
    /* @media (max-width: 1440px) {
        width: 100%;
        padding: 0 20px;
    } */
}

.sec-3-5 .section-bg-f {
    position: absolute;
    top: 67px;
    left: 50%;
    transform: translateX(-50%);
    width: 1200px;
    /* height: 100vh; */
    /* background: url("../images/bg.png") no-repeat top center;
    background-size: 100% auto;
    background-position: center;
    background-repeat: no-repeat; */
    transition: opacity 0.3s ease;
    z-index: 15;
    display: none;
    /* 消失时的渐隐效果 */
    /* position: fixed;
    top: 0;
    left: 50%;
    width: 1200px;
    height: 200vh;
    transform: translateX(-50%);
    background: url("../images/bg.png") no-repeat top center;
    background-size: 100% auto;
    display: none;
    z-index: -1; */
}

.sec-3-5 .section-bg-f img {
    width: 100%;
}

/* .sec-3-5 #customer .section-bg-f,
.sec-3-5 #section5 .section-bg-f {
    position: fixed;
} */

.section .section-bg {
    position: absolute;
    top: 0;
    left: 50%;
    width: 1200px;
    transform: translateX(-50%);
    /* z-index: -1; */
}

.section .section-bg img {
    width: 100%;
}

ul {
    list-style: none;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.6s ease;
}

.fade-down.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-down {
    opacity: 0;
    transform: translateY(-50px);
    transition: all 0.6s ease;
}

@keyframes fadeUp {
    0% {
        opacity: 0;
        transform: translate(-50%, -40%) translateY(33px);
        /* 初始向下偏移+透明 */
    }

    100% {
        opacity: 1;
        transform: translate(-50%, -50%) translateY(0);
        /* 归位+不透明 */
    }
}

@keyframes fadeUpBtn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) translateY(33px);
        /* 初始向下偏移+透明 */
    }

    100% {
        opacity: 1;
        transform: translate(-50%, -50%) translateY(0);
        /* 归位+不透明 */
    }
}


.footer {
    position: relative;
    background-color: #333333;
}

.footer.section {
    margin-top: 0px;
    padding: 9px 0;
}

.footer .section-inner {
    display: flex;
    flex-direction: column;
    height: 390px;
    color: #FFFFFF;
    padding: 55px 100px;
    background: none;
}

.footer .section-inner>div:nth-child(1) {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}


.footer .footer-left .logo {
    width: 241px;
    height: 83px;
}

.footer .footer-left div {
    margin-top: 17px;
    /* 原20px */
    width: 245px;
    /* 原294px */
    font-weight: 300;
    font-size: 13px;
    /* 原16px */
    color: #FFFFFF;
    line-height: 20px;
    /* 原24px */
    text-align: left;
    font-style: normal;
}

.footer .footer-right {
    display: flex;
    flex-direction: row;
    gap: 93px;
    /* 原112px */
    font-size: 13px;
    /* 原16px */
}

.footer .footer-right>div {
    display: flex;
    flex-direction: column;
    gap: 13px;
}

.footer .footer-right>div .title {
    color: #FFFFFF;
    line-height: 20px;
    font-weight: bold;
    margin-bottom: 7px;
}

.footer .footer-right>div a {
    display: block;
    color: #FFFFFF;
    text-decoration: none;
    font-weight: lighter;
    line-height: 20px;
}

.footer .copyright {
    flex: 1;
    font-weight: lighter;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    position: relative;
}

.footer .copyright::after {
    content: " ";
    position: absolute;
    left: 0px;
    bottom: 33px;
    width: 100%;
    display: block;
    border-top: 1px solid #464646;
}


.footer .footer-right>div a.nav-item:hover::after {
    background-color: #ffffff;
}