/* ponytail: shared header/nav/dropdown/footer/back-to-top — all 6 pages use these */
body {
    display: flex;
    overflow-x: hidden;
    margin: 0;
}

#main {
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    position: relative;
    margin-left: 360px;
    max-width: 289.37px;
    height: 32px;
    z-index: 1;
}

header nav {
    height: 72px;
    position: relative;
    right: 360px;
    display: flex;
    gap: 16px;
    flex-grow: 1;
    justify-content: flex-end;
    font-family: 'Microsoft YaHei', '微软雅黑';
    font-size: 16px;
    font-weight: bold;
}

header nav a {
    text-decoration: none;
    color: rgba(0, 0, 0, 0.6);
}

.ZGbutton {
    font-family: inherit;
    font-size: 16px;
    color: rgba(0, 0, 0, 0.6);
    font-weight: bolder;
    cursor: pointer;
    position: relative;
    top: 26px;
    border: none;
    background: none;
    text-transform: uppercase;
    transition: color 400ms cubic-bezier(0.25, 0.8, 0.25, 1);
}

.ZGbutton:focus,
.ZGbutton:hover {
    color: #040000;
}

.ZGbutton:after {
    content: '';
    pointer-events: none;
    bottom: -8px;
    left: 50%;
    position: absolute;
    width: 0;
    height: 6px;
    background-image: linear-gradient(to bottom right, #3da8ce, #0359a0);
    transition:
        width 400ms cubic-bezier(0.25, 0.8, 0.25, 1),
        left 400ms cubic-bezier(0.25, 0.8, 0.25, 1);
}

.ZGbutton:focus:after,
.ZGbutton:hover:after {
    width: 64px;
    left: 9%;
}

/* 下拉菜单 - 关于我们 */
.NBdropdown .dropdown-content,
.NBservice .service-content {
    width: 1924px;
    height: 0;
    background: #fafafa;
    position: absolute;
    top: 72px;
    left: 672px;
    transform: translateX(-50%);
    min-width: 90px;
    transition: height 0.5s ease;
    z-index: 0;
}

.NBdropdown:hover .dropdown-content,
.NBservice:hover .service-content {
    height: 300px;
}

.NBdropdown .ZGwb,
.NBservice .ZGwb {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 6px;
    position: absolute;
    top: 72px;
    color: rgba(0, 0, 0, 0.6);
    font-size: 16px;
    font-weight: normal;
    text-align: center;
    line-height: 22px;
    opacity: 0;
    transition: opacity 0.5s ease;
    cursor: pointer;
    z-index: 1;
}

.NBdropdown .ZGwb {
    right: 372px;
}
.NBservice .ZGwb {
    right: 280px;
}

.NBdropdown:hover .ZGwb,
.NBservice:hover .ZGwb {
    opacity: 1;
}

.ZGwb a:hover {
    font-weight: bold;
    color: #040000;
}

/* sticky 导航 */
.sticky {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.TTline {
    width: 100%;
    height: 1px;
    background: #f4f4f4;
}

/* 回到顶部 */
.buttonHDDB {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #383838;
    border: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 2px #f4f4f4;
    cursor: pointer;
    transition-duration: 0.4s;
    overflow: hidden;
    position: fixed;
    top: 80%;
    right: 100px;
    z-index: 1000;
}

.svgIcon {
    width: 12px;
    transition-duration: 0.4s;
}

.svgIcon path {
    fill: #fff;
}

.buttonHDDB:hover {
    width: 140px;
    border-radius: 50px;
    background-image: linear-gradient(to right, #3da8ce, #0359a0);
}

.buttonHDDB:hover .svgIcon {
    transition-duration: 0.4s;
    transform: translateY(-200%);
}

.buttonHDDB::before {
    position: absolute;
    bottom: -20px;
    content: '回到顶部';
    color: #fff;
    font-size: 0;
}

.buttonHDDB:hover::before {
    font-size: 13px;
    opacity: 1;
    bottom: unset;
    transition-duration: 0.4s;
}

/* 页尾 - 默认浅色版（招标采购/招标详情/联系我们/加入我们） */
.group_4 {
    z-index: 0;
}

.YWtextDS {
    box-shadow: 0 -3px 6px 0 rgba(0, 0, 0, 0.1);
    background: #fafafa;
    height: 462px;
    margin-top: -1px;
    width: 1920px;
    justify-content: flex-center;
    position: relative;
}

.YWtext {
    color: rgba(0, 0, 0, 0.6);
}

.YWtext span {
    line-height: 24px;
    font-size: 18px;
    margin-bottom: 4px;
    font-weight: bold;
}

.YWtext a {
    text-decoration: none;
    font-size: 14px;
    color: rgba(0, 0, 0, 0.6);
}

.YWtext a:hover {
    font-weight: bold;
}

/* 页尾列 */
.YWtextGYWM,
.YWtextJJFA,
.YWtextZBCG,
.YWtextJRWM,
.YWtextLXWM {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    position: absolute;
    top: 24px;
    z-index: 1;
}

.YWtextGYWM {
    left: 368px;
}
.YWtextJJFA {
    left: 520px;
}
.YWtextZBCG {
    left: 672px;
}
.YWtextJRWM {
    left: 824px;
}
.YWtextLXWM {
    left: 976px;
}

.FGline {
    width: 1200px;
    height: 1px;
    background: rgba(0, 0, 0, 0.6);
    position: absolute;
    left: 360px;
    top: 320px;
}

.DZDH {
    font-size: 14px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: absolute;
    left: 360px;
    top: 339px;
}

.DZ,
.DH {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
}

.DZimg,
.DHimg {
    width: 22px;
    height: 22px;
}

.XJJewm {
    position: absolute;
    right: 454px;
    bottom: 24px;
}

.XJJlogo {
    position: absolute;
    right: 360px;
    top: 130.5px;
}

/* == 联系方式行（招标采购 / 加入我们 / 联系我们） == */
.DHYXDZ {
    margin: 20px 0;
    width: 100%;
    height: 160px;
    display: flex;
    flex-direction: row;
    gap: 50px;
    color: rgba(0, 0, 0, 0.6);
}

.DHYXDZ img {
    width: 32px;
    height: 32px;
    border-radius: 16px;
    box-shadow: 0 3px 6px 0 rgba(0, 0, 0, 0.24);
}

.DHYXDZ img:hover {
    transform: scale(1.2);
    transition: all 0.2s linear;
}

.DH2,
.YX2,
.DZ2 {
    position: relative;
    left: 360px;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
}