* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* 防止padding撑大盒子 */
}

/* ========== 汉堡菜单按钮 ========== */
.hamburger-toggle {
    display: none; /* 桌面端隐藏 */
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1100;
    padding: 4px;
}

.hamburger-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* 汉堡激活态：三条线变成 X */
.hamburger-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger-toggle.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ========== 移动端导航面板 ========== */
.mobile-nav-panel {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1050;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: #fff;
    overflow-y: auto;
}

.mobile-nav-panel.open {
    display: block;
}

.mobile-nav-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 90px 24px 60px;  /* 顶部留出导航栏空间 (~52px + 间距) */
    min-height: 100vh;
    min-height: 100dvh;
}

/* --- 汉堡菜单中的手风琴链接 --- */
.mobile-footer-accordion {
    width: 100%;
    max-width: 320px;
}

.mfa-col {
    border-bottom: 1px solid #e8e8e8;
}

.mfa-col h3 {
    font-size: 16px;
    color: #333;
    padding: 15px 0;
    cursor: pointer;
    align-items: center;
    justify-content: space-between;
    user-select: none;
}

/* 只对当前可见语言的 h3 开启 flex */
html[lang="zh-CN"] .mfa-col h3.lang-zh,
html[lang="en"] .mfa-col h3.lang-en {
    display: flex;
}

/* 箭头 */
.mfa-col h3::after {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 1.5px solid #999;
    border-bottom: 1.5px solid #999;
    transform: rotate(45deg);
    transition: transform 0.25s ease;
    margin-left: 12px;
    flex-shrink: 0;
}

.mfa-col.open h3::after {
    transform: rotate(-135deg);
}

.mfa-links {
    display: none;
    flex-direction: column;
    gap: 12px;
    padding: 0 0 16px 8px;
}

.mfa-col.open .mfa-links {
    display: flex;
}

.mfa-links a {
    color: #777;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
}

.mfa-links a:active {
    color: #333;
}
html, body {
    width: 100%;
    min-height: 100%;
    background-color: #ffffff;
    color: #ffffff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    overflow-x: hidden;
}

body {
    overflow-y: auto;
}

main {
    width: 100%;
}

.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1100;
    width: 100%;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    background: rgba(4, 4, 7, 0.3);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nav-left {
    position: relative;
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    left: clamp(16px, 5vw, 70px);
}

.nav-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;   
}

.nav-center {
    /*flex: 1;*/
    /* max-width: 550px; */
    width: min(500px, calc(100vw - 320px));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: clamp(40px, 4vw, 80px);
    margin: 0 auto;
    padding: 0 10px;
    white-space: nowrap;
}

.nav-center a {
    color: #fff;
    text-decoration: none;
    font-size: clamp(22px, 1vw, 25px);
    line-height: 1;
    flex: 0 0 auto;

}

.brand-logo {
    height: 40px;
    width: auto;
    display: block;
}

.nav-icon {
    height: 50px;
    width: 70px;
    display: block;
}

.hero {
    position: relative;
    width: 100%;
    min-height: 100vh;
    overflow: hidden;
    border-top: 5px solid #fff;
}

body > .hero:first-of-type {
    border-top: none;
}

.hero .bg-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    min-height: 100%;
    object-fit: cover;
}

.hero-content {
    position: absolute;
    left: 10%;
    top: 50%;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    transform: translateY( -20%);
    color: #fff;
    text-align: left;
}

.hero-content1 {
    position: absolute;
    left: 60%;
    top: 50%;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    /* transform: translateY( -20%); */
    color: #fff;
    text-align: left;
}
.hero-content--second {
    position: absolute;
    right: clamp(28px, 8vw, 110px);
    top: 50%;
    transform: translateY(-50%);
    gap: 18px;
    text-align: left;
    max-width: min(760px, 44vw);     /* 用 max-width 替代 width，避免窄屏溢出 */
    font-size: clamp(34px, 4vw, 64px);
}
.hero-bt {
    display: flex;
    flex-direction: row;
    align-items: baseline;      /* 基线对齐，不同字号文字底部自然对齐 */
    gap: 10px;
    white-space: nowrap;        /* 防止窄屏换行 */
}
.hero-content--second-title {
    /* font-family: 'Orbitron', sans-serif; */
    font-weight: 700;
    font-size: clamp(72px, 6vw, 118px);  /* 标题明显大于副标题，同时随视口缩放 */
    line-height: 1;
}
.hero-content h1 {
    font-size: clamp(34px, 4vw, 64px);
    line-height: 1.12;
    color: #ffffff;
}

.hero-content h1.bt-h1 {
    background: linear-gradient(135deg, #ffffff 0%, rgba(104,169,250,1) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}



.hero-bt h3 {
    font-size: clamp(35px, 4vw, 45px);
    font-weight: 350;
    line-height: 1;
}

.hero-content--second span{
    font-size: clamp(43px, 4vw, 53px);
   font-weight: 400;
    color: #ffffff;
    
}

.hero-content--second p {
    font-size: clamp(20px, 1.2vw, 24px);
    line-height: 1.5;
    font-weight: 400;
    opacity: 0.92;
    color:#A1A2A3 ;
}

.split-bar {
    /* 1. 设置总宽度为 20px */
    width: 100px;

    /* 2. 开启 Flex 布局，让内部两个 span 横向排列并平分空间 */
    display: flex;

    /* 3. 防止内容溢出，确保总宽度严格控制在 20px */
    overflow: hidden;

    /* 可选：让高度与宽度一致，形成正方形容器，便于控制线条粗细 */
    height: 4px;
}

.split-bar span {
    /* 平分父容器的宽度 (20px / 2 = 10px) */
    flex: 1;

    /* 设置线条高度 (相当于边框粗细) */
    height: 100%;
}

/* 左侧颜色 (浅灰) */
.split-bar .left {
    background-color: #c0c0c0;
}

/* 右侧颜色 (深灰) */
.split-bar .right {
    background-color: #808080;
}
.hero-btn {
    position: relative; /* 【关键点1】开启相对定位，作为内部箭头的参照物 */
    display: flex;      /* 【关键点2】这里建议用 flex 布局，比 inline-flex 更好控制对齐 */
    align-items: center;
    justify-content: flex-start; /* 确保内容从左开始排列 */

    /* 宽度必须固定！如果不固定，放大图片后按钮会自动变宽。
       如果你的按钮左边对齐，可以直接写死宽度，或者用 max-width */
    width: 185px;
    height: 55px;
    padding-left: 22px;
    /* 右边padding要去掉，因为我们把箭头绝对定位了，不需要留空 */

    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: 999px;
    color: #fff;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(6px);
    margin-top: 30px;
    box-sizing: border-box; /* 确保 padding 不会让盒子变大 */
}

/* 文字样式微调 */
.btn-text {
    font-size: 18px;

    letter-spacing: 0.04em;
    /* 增加一点右边距，拉开文字和箭头的距离，防止放大后重叠 */
    margin-right: 10px;
}

.arrow-icon {
    /* 【关键点3】绝对定位！脱离文档流，箭头就不会占用空间了 */
    position: absolute;
    right: 10px;   /* 距离右边框的距离 */
    top: 50%;
    transform: translateY(-50%); /* 垂直居中 */

    width: 62px;   /* 原来的值 */
    height: auto;  /* 高度自适应 */
    display: block;
}

.arrow-icon img {
    width: 35%;
    height: auto;
    margin-top: 5px;
    object-fit: contain; /* 确保图片完整显示，不被拉伸裁剪 */
    /* 核心放大代码：在这里调整大小 */
    transform: scale(1.8); /* 放大1.5倍，你可以改成 2 试试 */
    margin-left:20px;
}
.app-section {
    position: relative;
    min-height: 100vh;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(40px, 6vw, 80px) clamp(20px, 6vw, 80px);
}



.app-layout {
    position: absolute;
    left: 78%;
    top: 45%;
    transform: translate(-50%, -50%);
    z-index: 1;
    width: 100%;
    max-width: 1180px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(36px, 8vw, 120px);
    flex-wrap: wrap;
    margin-left: 50px;
}



.app-copy {
    flex: 1 1 320px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: clamp(30px, 3vw, 50px);
}

.app-copy h1 {
    font-size: clamp(52px, 4.8vw, 67px);
    font-weight: 520;
    line-height: 1.7;
    letter-spacing: 0.02em;
    text-align: left;
    white-space: nowrap;
}

.app-copy h1.app-h1.lang-en {
    font-size: clamp(38px, 4.8vw, 50px) !important;
    font-weight: 420;
    line-height: 1.8;
    letter-spacing: 0.02em;
    text-align: left;
    white-space: nowrap;
}
.app-copy p {
    font-size: clamp(26px, 1.2vw, 36px);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: 0.02em;
    text-align: left;
    color: #ccc;
}

.app-actions {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 25px;
    flex-wrap: nowrap;
}



.app-download {
    flex: 1;
    min-width: 170px; /* 设置最小宽度防止过小 */
    max-width: 200px; /* 设置最大宽度限制 */
    height: 56px;
    border-radius: 12px;
    display:flex;
    align-items: center;
    justify-content: flex-start;
    text-decoration: none;
    overflow: hidden;

}

.app-download {
    display: flex;
    justify-content: flex-start;
    padding: 8px 15px;
    gap: 10px;
    border: 0.5px solid #cccccc88;
    color: #fff;
   
}


.app-download span{
    font-size: clamp(16px, 1.2vw, 20px);
    font-weight: 400;
    line-height: 1;
    white-space: nowrap;
}

.app-download img {
    width: 40px;
    height: 37px;
    display: block;
}


.app-docs span{
color: #77B7FE !important;

}

   

.feature-grid-section {
    position: relative;
    min-height: 100vh;
    width: 100%;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(15px, 5vw, 64px);
    border-top: 7px solid #fff;
}

.feature-grid {
    width: 100%;
    max-width: 1400px;
    display: grid;
    grid-template-columns: repeat(3, 420px);
    gap: 45px;
    justify-content: center;
}

.feature-card {
    width: 420px;
    height: 340px;
    background: #fff;
    border: 1px solid #e8e8e8;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
 
    text-align: center;
    padding: 30px 55px;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    cursor: pointer;
}



.feature-icon {
    width: 112px;
    height: 112px;
    object-fit: contain;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 500;
    color: #1a1a1a;
    margin-bottom: 12px;
    line-height: 1.3;
}



.feature-card p {
    font-size: 16px;
    font-weight: 400;
    color: #888;
    line-height: 1.6;
    max-width: 340px;
}



.about-section {
    position: relative;
    min-height: 100vh;
    width: 100%;
    overflow: hidden;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 30px;
}

.about-section .bg-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.about-content  {
    position: relative;
    z-index: 1;
    width: min(1000px, 86vw);
    text-align: center;
    color: #fff;
    margin: 0 auto;
}

.about-content h1 {
    font-size: clamp(40px, 5vw, 72px);
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.08em;
    margin-top: 30px; 
}

.about-content p {
    font-size: 25px;
    line-height: 1.6;
    letter-spacing: 0.02em;
    margin:  10px 0px; 
    
 
}
.about-content-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 490px;
    margin-bottom: 20px;
}

.investment-section {
    width: 100%;
    min-height: 100vh;
    background-color: #FAFCFF;
  
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(40px, 6vw, 80px) clamp(20px, 6vw, 80px);
    border-top: 7px solid #fff;
}

.investment-section h1 {
    font-size: clamp(40px, 4vw, 64px);
    line-height: 1;
    color: #111;
    font-weight: 700;
    margin-bottom: clamp(40px, 6vw, 70px);
}

.investment-logos {
    width: 100%;
    max-width: 1350px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: clamp(24px, 6vw, 90px);
    flex-wrap: nowrap;
}

.investment-logos img {
    width: calc((100% - 2 * clamp(24px, 6vw, 90px)) / 3);
    max-width: 320px;
    height: auto;
    object-fit: contain;
    display: block;
}

.contact-section {
    width: 100%;
    min-height: 220px;
  
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 28px;
    padding: 32px clamp(24px, 4vw, 70px);
    border-top: 1px solid #efefef;
    border-bottom: 1px solid #dddddd;

    margin-top: 150px;

}

.contact-section h2 {
    font-size: clamp(28px, 3vw, 42px);
    font-weight: 600;
    color: #111;
    padding-right: 28px;
    border-right: 1px solid #e5e5e5;
    white-space: nowrap;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
    color: #666;
    font-size: 18px;
    line-height: 1.4;
}

.social-icons {
    display: flex;
    align-items: center;
    gap: 14px;
    justify-self: end;
}

.social-icons a {
    width: 48px;
    height: 48px;
    border-radius: 30px;
    background: #201f1f;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    flex: 0 0 auto;
}

.social-icons img {
    width: 50px;
    height: 50px;
    object-fit: contain;
    display: block;
}
.social-icon--wechat img{
    width:63px;
    height:63px;
}

.footer-section {
    width: 100%;
    min-height: 100vh;
    background: #FAFCFF;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 36px clamp(24px, 4vw, 70px) 22px;
    padding-left: 100px;
    padding-bottom: 20px;
    border-top: 7px solid #fff;
}

.footer-links {
    margin-top: 125px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 48px;
    max-width: 760px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.footer-col h3 {
    font-size: 22px;
    color: #111;
    margin-bottom: 6px;
}

.footer-col-links {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.footer-col a {
    color: #777;
    text-decoration: none;
    font-size: 20px;

    line-height: 1.4;
}
.footer-bottom {
    display: flex;
    align-items: flex-end; /* 保持底部对齐 */
    justify-content: space-between;
    gap: 20px;
    color: #b7b7b7;
    font-size: 20px;
    font-weight: 500;
    min-height: 80px; /* 【关键】给整个底部区域一个最小高度，防止太挤 */
    margin-bottom: 20px;
}

.footer-legal {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.footer-legal p {
    display: flex;
    align-items: center;
}

/* 桌面端分隔符 */
.footer-copyright::after,
.footer-icp::after {
    content: '|';
    margin-left: 6px;
    color: #bbb;
}

.footer-copyright {
    font-size: 14px;
    color: #999;
    margin: 0;
}

.footer-icp {
    font-size: 14px;
    color: #999;
    margin: 0;
}

.footer-icp a {
    color: #999;
    text-decoration: none;
}

.footer-police {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 14px;
    color: #999;
    margin: 0;
}

.footer-police a {
    color: #999;
    text-decoration: none;
}

/* 左边国徽：变小 */
.footer-brand-img {
    height: 27px !important; /* 调小 */
    width: auto;
    vertical-align: middle; /* 辅助对齐 */
}

/* 右边Logo：变大，且单独控制它的底部对齐 */
.footer-brand {
    height: 60px !important; /* 调大 */
    width: auto;
    display: block;
    /* 【关键】让这个图片自己贴底，不受文字行高影响 */
    align-self: flex-end;
    /* 微调：如果觉得太高，可以用 margin-top 往下压一点 */
    /* margin-top: 10px;*/
}
.footer-bottom a {
    text-decoration: none;
    color: #b7b7b7;
    /*transition: color 0.2s ease; !* 可选：添加颜色过渡效果 *!*/
}

.footer-bottom a:hover {
    text-decoration: none; /* 确保悬停时也没有下划线 */

}

/* 让每个小图标成为定位基准 */
.social-icons {
    display: flex;
    align-items: center;
    gap: 14px; /* 图标间距，你自己调 */
}

.social-icon {
    position: relative; /* 关键 */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px; /* 小图标盒子尺寸，按你UI改 */
    text-decoration: none;
}

/* 小图标本身（如果你需要统一尺寸约束） */
.social-icon .icon-img {
    width: 100%; height: 100%;
    object-fit: contain;
    display: block;
}

/* ========== 弹出大图 ========== */
.popimg {
    position: absolute;
    bottom: calc(100% + 8px); /* 在图标上方 8px 处弹出；想往下弹就用 top: calc(100% + 8px) */
    left: 50%;
    transform: translateX(-50%) scale(.92); /* 轻微缩一下更“浮” */
    z-index: 999;

    background: #fff;               /* 你要白底就用白底 */
    padding: 6px;                  /* 内边距 */
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,.18);

    opacity: 0;
    visibility: hidden;
    pointer-events: none;          /* 关键：不抢鼠标，避免闪烁 */
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
}

.popimg img {
    display: block;
    width: 150px;                  /* 大图宽，自己定 */
    height: auto;
}

/* hover 显示 */
.social-icon:hover .popimg {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}
.popimg-label {
    display: block;           /* 确保块级化 */
    text-align: center;      /* 文字水平居中 */
    width: 100%;             /* 宽度占满父容器，居中才有效 */
    margin-bottom: 6px;      /* 与图片的间距，可按需调整 */
    font-size: 14px;         /* 示例字号 */
    color: #333;             /* 示例颜色 */
    pointer-events: none;    /* 避免干扰鼠标事件 */
}
/* 外层容器：负责定位和整体显示 */
.popimg-wrapper {
    position: absolute;
    bottom: calc(100% + 8px);  /* 图标上方弹出 */
    left: 50%;
    transform: translateX(-50%);
    z-index: 99;

    display: flex;             /* 横向排列 */
    gap: 16px;                 /* 两张图的间距 */
    background: #fff;
    padding: 12px;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,.18);

    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
}

/* 鼠标 hover 图标时显示 */
.social-icon--wechat:hover .popimg-wrapper {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}

/* 每个子项（图片+文字）垂直排列 */
.popimg-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.popimg-item img {
    width: 130px;    /* 根据需要调整 */
    height: auto;
    display: block;
}

.social-icon--xiaohongshu{
    margin-bottom: 5px;
}

/* ================================================================
   响应式布局 — 平板及以下 (≤768px)
   ================================================================ */
@media (max-width: 768px) {

    /* --- 全局 --- */
    html, body {
        overflow-x: hidden;
    }

    img {
        max-width: 100%;
        height: auto;
    }

    /* --- 导航栏 --- */
    .top-nav {
        height: 52px;
        padding: 0 16px;
        justify-content: space-between; /* 移动端：两端对齐 */
    }

    .nav-left {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }

    .brand-logo {
        height: 30px;
    }

    .nav-center {
        display: none; /* 桌面导航隐藏 */
    }

    .nav-right {
        gap: 8px;
        margin-left: auto; /* 保持在最右侧 */
    }

    .nav-icon {
        height: 36px;
        width: 50px;
    }

    .nav-right span {
        font-size: 14px;
    }

    .hamburger-toggle {
        display: flex; /* 显示汉堡 */
        flex: 0 0 auto;
    }

    /* --- 背景图移动端适配 --- */
    .hero .bg-img,
    .about-section .bg-img {
        object-fit: cover;
        object-position: center;
        width: 100%;
        height: 100%;
    }

    /* --- 前两张 Hero 背景图固定高度 360px --- */
    .hero:not(.app-section):not(.about-section) {
        height: 360px;
        min-height: 360px;
        border-top: 3px solid #fff;
    }

    .hero:not(.app-section):not(.about-section) .bg-img {
        object-fit: cover;
        object-position: center;
        width: 100%;
        height: 100%;
    }

    /* --- Hero 首页 --- */

    .hero-content {
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        align-items: center;
        text-align: center;
        gap: 14px;
        width: 90%;
    }

    .hero-content h1 {
        font-size: clamp(26px, 5vw, 38px);
        text-align: center;
    }

    .hero-content h1.bt-h1 {
        font-size: clamp(24px, 4.5vw, 36px);
    }

    .hero-btn {
        width: 150px;
        height: 44px;
        padding-left: 16px;
        margin-top: 16px;
    }

    .btn-text {
        font-size: 15px;
    }

    .arrow-icon {
        width: 48px;
        right: 6px;
    }

    .arrow-icon img {
        transform: scale(1.3);
        margin-left: 12px;
    }

    /* --- Hero 第二屏 --- */
    .hero-content1 {
        left: 50% !important;
        top: 50%;
        transform: translate(-50%, -50%);
        align-items: center;
        text-align: center;
        gap: 14px;
        max-width: 90vw;
        right: auto;
    }

    .hero-bt {
        flex-direction: column;
        align-items: center;
        gap: 6px;
    }

    .hero-content--second-title {
        font-size: clamp(48px, 8vw, 72px);
    }

    .hero-bt h3 {
        font-size: clamp(24px, 4vw, 36px);
    }

    .hero-content--second span {
        font-size: clamp(28px, 5vw, 40px);
        text-align: center;
    }

    .hero-content--second p {
        font-size: clamp(15px, 2vw, 18px);
        text-align: center;
    }

    .split-bar {
        width: 60px;
        height: 3px;
        margin: 0 auto;
    }

    /* --- 产品卡片 --- */
    .feature-grid-section {
        padding: 40px 20px;
        min-height: auto;
    }

    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 20px;
        max-width: 100%;
    }

    .feature-card {
        width: 100%;
        height: auto;
        min-height: 260px;
        padding: 24px 16px;
        border-radius: 14px;
    }

    .feature-icon {
        width: 72px;
        height: 72px;
        margin-bottom: 14px;
    }

    .feature-card h3 {
        font-size: 17px;
        margin-bottom: 8px;
    }

    .feature-card p {
        font-size: 14px;
        max-width: 100%;
    }

    /* --- APP 下载区 --- */
    .app-section {
        min-height: 100vh;
        min-height: 100dvh;
        padding: 40px 20px;
    }

    .app-layout {
        left: 50% !important;
        top: 50%;
        transform: translate(-50%, -50%);
        margin-left: 0;
        max-width: 90vw;
        flex-direction: column;
        align-items: center;
        gap: 30px;
    }

    .app-copy {
        align-items: center;
        text-align: center;
        flex: 0 0 auto;
        gap: 24px;
    }

    .app-copy h1 {
        font-size: clamp(32px, 6vw, 48px);
        text-align: center;
        white-space: normal;
    }

    .app-copy h1.app-h1.lang-en {
        font-size: clamp(24px, 5vw, 36px) !important;
        white-space: normal;
    }

    .app-copy p {
        font-size: clamp(16px, 3vw, 22px);
        text-align: center;
    }

    .app-actions {
        gap: 16px;
    }

    .app-download {
        min-width: 140px;
        max-width: 170px;
        height: 48px;
        border-radius: 10px;
    }

    .app-download span {
        font-size: clamp(14px, 2vw, 17px);
    }

    .app-download img {
        width: 32px;
        height: 30px;
    }

    /* --- 关于我们 --- */
    .about-section {
        height: 520px;
        min-height: 520px;
        align-items: stretch;
        padding: 40px 20px 24px;
    }

    .about-content {
        width: 92vw;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        flex: 1;
    }

    .about-content h1 {
        font-size: clamp(30px, 6vw, 48px);
        margin-top: 0;
    }

    .about-content-text {
        margin-top: 0;
        margin-bottom: 0;
        gap: 12px;
    }

    .about-content-text p {
        font-size: 16px;
        line-height: 1.6;
    }

    /* --- 投资方 --- */
    .investment-section {
        min-height: auto;
        padding: 50px 20px 40px;
    }

    .investment-section h1 {
        font-size: clamp(28px, 5vw, 44px);
        margin-bottom: 36px;
    }

    .investment-logos {
        flex-wrap: nowrap;
        justify-content: center;
        gap: 16px;
    }

    .investment-logos img {
        width: auto;
        max-width: 28vw;
        height: auto;
        flex-shrink: 1;
        min-width: 0;
    }

    /* --- 联系我们 --- */
    .contact-section {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 28px 20px;
        margin-top: 60px;
        text-align: center;
        justify-items: center;
        min-height: auto;
    }

    .contact-section h2 {
        border-right: none;
        padding-right: 0;
        font-size: clamp(22px, 4vw, 32px);
    }

    .contact-info {
        align-items: center;
        font-size: 15px;
        gap: 10px;
    }

    .social-icons {
        justify-self: center;
        gap: 10px;
    }

    .social-icons a {
        width: 40px;
        height: 40px;
        border-radius: 25px;
    }

    .social-icons img {
        width: 40px;
        height: 40px;
    }

    .social-icon--wechat img {
        width: 50px;
        height: 50px;
    }

    /* --- 底部 --- */
    .footer-section {
        min-height: auto;
        padding: 36px 24px 20px;
    }

    .footer-links {
        margin-top: 40px;
        display: flex;
        flex-direction: column;
        gap: 0;
        max-width: 100%;
    }

    .footer-col {
        gap: 0;
        border-bottom: 1px solid #e8e8e8;
    }

    .footer-col h3 {
        font-size: 17px;
        padding: 16px 0;
        margin-bottom: 0;
        cursor: pointer;
        align-items: center;
        justify-content: space-between;
        user-select: none;
    }

    /* 只对当前可见语言的 h3 开启 flex，不影响 display:none 的隐藏语言 */
    html[lang="zh-CN"] .footer-col h3.lang-zh,
    html[lang="en"] .footer-col h3.lang-en {
        display: flex;
    }

    /* 下拉箭头 */
    .footer-col h3::after {
        content: '';
        display: inline-block;
        width: 10px;
        height: 10px;
        border-right: 2px solid #999;
        border-bottom: 2px solid #999;
        transform: rotate(45deg);
        transition: transform 0.25s ease;
        flex-shrink: 0;
    }

    .footer-col.open h3::after {
        transform: rotate(-135deg);
    }

    /* 链接列表 — 默认折叠 */
    .footer-col-links {
        display: none;
        flex-direction: column;
        gap: 14px;
        padding-bottom: 16px;
    }

    .footer-col.open .footer-col-links {
        display: flex;
    }

    .footer-col a {
        font-size: 15px;
        padding-left: 4px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 20px;
        font-size: 14px;
        min-height: auto;
        margin-top: 40px;
    }

    .footer-legal {
        flex-direction: column;
        gap: 10px;
    }

    /* 移动端去掉分隔符 */
    .footer-copyright::after,
    .footer-icp::after {
        content: none;
    }

    .footer-copyright,
    .footer-icp,
    .footer-police {
        font-size: 13px;
    }

    .footer-brand-img {
        height: 20px !important;
    }

    .footer-brand {
        height: 40px !important;
        align-self: center;
    }

    /* --- 微信弹出二维码移动端适配 --- */
    .popimg-wrapper {
        bottom: auto;
        top: calc(100% + 8px);
        left: auto;
        right: 0;
        transform: none;
        flex-direction: column;
        gap: 10px;
        padding: 10px;
    }

    .social-icon--wechat:hover .popimg-wrapper {
        transform: none;
    }

    .popimg-item img {
        width: 110px;
    }

    .popimg {
        bottom: auto;
        top: calc(100% + 8px);
        left: auto;
        right: 0;
        transform: none;
    }

    .social-icon:hover .popimg {
        transform: none;
    }

    .popimg img {
        width: 120px;
    }
}

/* ================================================================
   响应式布局 — 手机 (≤480px)
   ================================================================ */
@media (max-width: 480px) {

    /* --- 导航 --- */
    .top-nav {
        height: 46px;
        padding: 0 12px;
        justify-content: space-between;
    }

    .nav-left {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }

    .brand-logo {
        height: 26px;
    }

    .nav-right {
        margin-left: auto;
    }

    .nav-icon {
        height: 30px;
        width: 42px;
    }

    .nav-right span {
        font-size: 12px;
    }

    .hamburger-toggle {
        display: flex;
        flex: 0 0 auto;
    }

    .mobile-nav-inner {
        padding: 72px 20px 50px;  /* 导航栏 ~46px + 间距 */
    }

    .mfa-col h3 {
        font-size: 15px;
        padding: 13px 0;
    }

    .mfa-links a {
        font-size: 13px;
    }

    /* --- 前两张 Hero 背景图固定高度 360px --- */
    .hero:not(.app-section):not(.about-section) {
        height: 360px;
        min-height: 360px;
    }

    .hero:not(.app-section):not(.about-section) .bg-img {
        object-fit: cover;
        object-position: center;
        width: 100%;
        height: 100%;
    }

    /* --- Hero 首页 --- */
    .hero-content {
        gap: 10px;
        width: 94%;
    }

    .hero-content h1 {
        font-size: clamp(22px, 7vw, 28px);
    }

    .hero-content h1.bt-h1 {
        font-size: clamp(20px, 6.5vw, 26px);
    }

    .hero-btn {
        width: 140px;
        height: 40px;
        padding-left: 14px;
        margin-top: 10px;
    }

    .btn-text {
        font-size: 14px;
    }

    .arrow-icon {
        width: 40px;
        right: 4px;
    }

    .arrow-icon img {
        transform: scale(1.1);
        margin-left: 8px;
    }

    /* --- Hero 第二屏 --- */
    .hero-content--second-title {
        font-size: clamp(40px, 10vw, 56px);
    }

    .hero-bt h3 {
        font-size: clamp(20px, 5vw, 28px);
    }

    .hero-content--second span {
        font-size: clamp(22px, 6vw, 30px);
    }

    .hero-content--second p {
        font-size: clamp(13px, 3vw, 16px);
        line-height: 1.5;
    }

    .text-group {
        text-align: center;
    }

    /* --- 产品卡片 --- */
    .feature-grid-section {
        padding: 32px 16px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
    }

    .feature-card {
        min-height: 220px;
        padding: 20px 16px;
    }

    .feature-icon {
        width: 60px;
        height: 60px;
        margin-bottom: 10px;
    }

    .feature-card h3 {
        font-size: 16px;
    }

    .feature-card p {
        font-size: 13px;
        line-height: 1.5;
    }

    /* --- APP 下载区 --- */
    .app-section {
        padding: 30px 16px;
        min-height: 100vh;
        min-height: 100dvh;
    }

    .app-layout {
        max-width: 94vw;
        gap: 24px;
    }

    .app-copy h1 {
        font-size: clamp(24px, 7vw, 32px);
    }

    .app-copy h1.app-h1.lang-en {
        font-size: clamp(18px, 6vw, 26px) !important;
    }

    .app-copy p {
        font-size: clamp(14px, 4vw, 16px);
    }

    .app-actions {
        flex-direction: column;
        gap: 12px;
        width: 100%;
        align-items: center;
    }

    .app-download {
        min-width: 160px;
        max-width: 200px;
        width: 100%;
        height: 44px;
        justify-content: center;
        gap: 8px;
    }

    .app-download img {
        width: 28px;
        height: 26px;
    }

    .app-download span {
        font-size: 14px;
    }

    /* --- 关于我们 --- */
    .about-section {
        height: 490px;
        align-items: stretch;
        padding: 16px 16px 20px;
        min-height: auto;
    }

    .about-section .bg-img {
        object-fit: cover;
        object-position: center;
        height: 100%;
    }

    .about-content {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        flex: 1;
    }

    .about-content h1 {
        font-size: clamp(26px, 7vw, 36px);
    }

    .about-content-text {
        margin-top: 0;
    }

    .about-content-text p {
        font-size: 14px;
        line-height: 1.5;
    }

    /* --- 投资方 --- */
    .investment-section {
        padding: 40px 16px 36px;
    }

    .investment-section h1 {
        font-size: clamp(24px, 6vw, 32px);
        margin-bottom: 28px;
    }

    .investment-logos {
        flex-wrap: nowrap;
        gap: 10px;
    }

    .investment-logos img {
        max-width: 30vw;
        flex-shrink: 1;
        min-width: 0;
    }

    /* --- 联系我们 --- */
    .contact-section {
        padding: 24px 16px;
        margin-top: 40px;
        gap: 16px;
    }

    .contact-section h2 {
        font-size: 20px;
    }

    .contact-info {
        font-size: 13px;
        gap: 6px;
    }

    .social-icons {
        gap: 8px;
    }

    .social-icons a {
        width: 36px;
        height: 36px;
    }

    .social-icons img {
        width: 34px;
        height: 34px;
    }

    .social-icon--wechat img {
        width: 42px;
        height: 42px;
    }

    /* --- 底部 --- */
    .footer-section {
        padding: 24px 16px 16px;
    }

    .footer-links {
        margin-top: 20px;
    }

    .footer-col h3 {
        font-size: 15px;
        padding: 14px 0;
    }

    .footer-col-links {
        gap: 12px;
        padding-bottom: 14px;
    }

    .footer-col a {
        font-size: 13px;
    }

    .footer-bottom {
        margin-top: 30px;
        gap: 16px;
    }

    .footer-copyright,
    .footer-icp,
    .footer-police {
        font-size: 12px;
    }

    .footer-brand-img {
        height: 17px !important;
    }

    .footer-brand {
        height: 34px !important;
    }
}