.headerBlock {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 1000000;
    background-color: transparent;
    transition: background-color 0.25s ease-out;
    box-shadow: none;
}

.headerBlock.white-bg {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header {
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

/* ===== 移动端菜单按钮 ===== */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
    z-index: 1000003;
    background: none;
    border: none;
    padding: 0;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #000;
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ===== 黑色遮罩层（在白色菜单下方） ===== */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ===== 移动端侧边菜单（遮罩上方） ===== */
.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 80vw;
    background-color: #fff;
    z-index: 1000002;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: 80px 30px 40px;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu .sItem {
    padding: 16px 0;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

.mobile-menu .sItem a {
    font-size: 17px;
    color: #333;
    font-weight: 500;
    display: block;
    transition: color 0.2s;
}

.mobile-menu .sItem a:hover,
.mobile-menu .sItem a:active {
    color: #2871FF;
}

.mobile-menu .logoBtn {
    margin-top: 24px;
    padding: 14px 0;
    background-color: #2871FF;
    border-radius: 8px;
    text-align: center;
}

.mobile-menu .logoBtn a {
    color: #FFFFFF;
    font-size: 16px;
    font-weight: 500;
}

.logo {
    padding: 18px 0;
    flex-shrink: 0;
}

.logo .l-img {
    width: 177px;
    height: 65px;
}

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

.shortcut .sItem {
    position: relative;
    width: fit-content;
    display: flex;
    align-items: center;
    height: 100%;
}

.shortcut .sItem a {
    font-weight: 400;
    font-size: 18px;
    color: #000000;
    white-space: nowrap;
}

.header .shortcut .select a {
    color: #2871FF;
}

.header .shortcut .select::after {
    content: ' ';
    position: absolute;
    left: 4px;
    right: 4px;
    bottom: -35px;
    height: 3px;
    background-color: #2871FF;
    border-radius: 2px;
}

.header .shortcut .logoBtn {
    width: fit-content;
    height: fit-content;
    padding: 10px 24px;
    background-color: #333333;
    border-radius: 8px;
    flex-shrink: 0;
}

.header .shortcut .logoBtn a {
    color: #FFFFFF;
    font-size: 15px;
}

/* ===== 底部 ===== */
.footerMian {
    width: 100%;
    background-color: #0D202F;
}

.copyRight {
    width: 100%;
    text-align: center;
    border-top: 1px solid #334250;
    padding: 20px 0;
    font-weight: 400;
    font-size: 16px;
    color: #9FA3AF;
}

.footerList {
    padding: 60px 0;
    font-weight: 500;
    font-size: 19px;
    color: #FFFFFF;
    justify-content: center;
}

.footerItem {
    margin-right: 40px;
    flex-shrink: 0;
}

.footerItem:last-child {
    margin-right: 0;
}

.footerItem .tipTit {
    white-space: nowrap;
    margin-bottom: 30px;
}

.footerItem li {
    font-weight: 400;
    font-size: 16px;
    color: #9FA3AF;
    margin-bottom: 20px;
}

.footerItemTip {
    font-size: 16px;
    margin: 15px 0 25px;
}

.ercodeList {
    display: flex;
}

.ercodeItem {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 400;
    font-size: 14px;
    color: #788498;
    margin-right: 40px;
}

.ercodeImg {
    width: 120px;
    height: 120px;
    margin-bottom: 10px;
}

.contactItem {
    width: 300px;
    display: flex;
    align-items: center;
    margin-bottom: 45px;
}

.contactItem .contactImg {
    width: 48px;
    height: 48px;
    margin-right: 15px;
}

.contactItem .contactInfo {
    font-weight: 400;
    font-size: 16px;
    color: #9FA3AF;
}

.contactItem .contactInfo .contactTit {
    white-space: nowrap;
    margin-bottom: 10px;
    font-weight: 500;
    font-size: 19px;
    color: #FFFFFF;
}

/* ===== 主体 banner ===== */
main {
    width: 100%;
    overflow: hidden;
}

.banner {
    width: 100%;
    position: relative;
    height: 720px;
    overflow: hidden;
}

.bannerImg {
    width: 100%;
    height: 100%;
    flex-shrink: 0;
    object-fit: cover;
    object-position: center center;
}

.bannerBtn1 {
    position: absolute;
    top: 66.67%;
    left: 29.17%;
    transform: translate(-50%, 0);
    width: 150px;
    height: 50px;
    line-height: 50px;
    border-radius: 7px;
    background-color: #2871FF;
    color: #fff;
    border: 1px solid #2871FF;
    font-size: 15px;
}

.bannerBtn2 {
    left: 48.96%;
    background-color: #fff;
    color: #2871FF;
}