:root{
    --border-dunk: rgb(234, 236, 233);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* logo */
.logo {
    position: relative;
    font-size: 1.5em;
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
    text-decoration: none;
    letter-spacing: 1px;
}
.logo img {
    width: 140px;
    height: 100px;
}

/* nav */
header.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: 0.6s;
    padding: 40px 10px;
    z-index: 20000;
}

header.nav.sticky {
    padding: 5px 10px !important;
    background: #fff;
}

header.nav .logo {
    position: relative;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    font-size: 2em;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: 0.6s;
}

header.nav ul {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

header.nav ul li {
    position: relative;
    list-style: none;
}

header.nav ul li a {
    position: relative;
    margin: 0 15px;
    text-decoration: none;
    color: #fff;
    letter-spacing: 2px;
    font-weight: 500px;
    transition: 0.6s;
    white-space: nowrap;
}

header.nav ul li a.active{
    border-bottom: 1px solid white;
}
header.nav.sticky ul li a.active{
    border-bottom: 1px solid black;
}

.banner {
    position: relative;
    width: 100%;
    height: 100vh;
    /* 	background: url(#); */
    background: linear-gradient(to bottom, black, white);
    background-size: cover;
}

header.nav.sticky .logo,
header.nav.sticky ul li a {
    color: #000;
}

header.nav .logo img {
    display: none;
    width: 92px;
    height: 32px;
}

header.nav.sticky .logo img {
    display: block;
}

/* arrow */
.sec-arrow-left,
.sec-arrow-right {
    position: absolute;
    z-index: 10000;
    top: calc(50vh - 25px);
    width: 50px;
    height: 50px;
    font-size: 50px;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
}

.sec-arrow-left .af-s {
    animation: arrow-lefter 1s ease-out infinite;
    /* 每次动画之间间隔 1s，所以总周期是 2s */
    animation-delay: 0s;
    animation-iteration-count: infinite;
    animation-direction: normal;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in;

    /* 关键点：通过 animation-iteration + steps 来形成2s的周期 */
    animation-duration: 2s;
    transform-origin: center center;
}

.sec-arrow-right .af-s {
    animation: arrow-righter 1s ease-out infinite;
    /* 每次动画之间间隔 1s，所以总周期是 2s */
    animation-delay: 0s;
    animation-iteration-count: infinite;
    animation-direction: normal;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in;

    /* 关键点：通过 animation-iteration + steps 来形成2s的周期 */
    animation-duration: 2s;
    transform-origin: center center;
}

@keyframes arrow-lefter {
    from {
        opacity: 0.75;
        transform: translateX(8px) scale(0.85);
    }

    to {
        opacity: 0;
        transform: translateX(-4px) scale(0.4);
    }
}

@keyframes arrow-righter {
    from {
        opacity: 0.75;
        transform: translateX(-8px) scale(0.85);
    }

    to {
        opacity: 0;
        transform: translateX(4px) scale(0.4);
    }
}

.sec-arrow-left {
    left: 5px;
}

.sec-arrow-right {
    right: 5px;
}

.sec-arrow-left:hover,
.sec-arrow-right:hover {
    opacity: 0.75;
}

/* main */
.stat-wrapper {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
    background-color: #2f6d56;
    padding-bottom: 70px;
    /*	background-color: antiquewhite;*/
}

.stat-wrapper-end{
    padding-bottom: 0;
}

.stat-top {
    position: relative;
    font-size: 40px;
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    width: 100%;
}

.stat-top::after {
    content: '';
    width: 100%;
    height: 2px;
    z-index: 0;
    position: absolute;
    background-color: #eef1e9;
}

.stat-black {
    color: green;
    background-color: transparent;
}

.stat-black .stat-top::after {
    background-color: green;
}

.grad-white{
    background: linear-gradient(to bottom, #2f6d56, #eef1e9);
    width: 100%;
    height: 35px;
}

.height-auto{
    height: auto !important;
}

.padding-bottom{
    padding-bottom: 70px;
}

.sec-fullscreen{
    width: 100vw;
    height: 100vh;
}

/* PC 半屏：通常是平板或PC窗口缩小到一半时 */
@media screen and (min-width: 620px) and (max-width: 1200px) {

}

/* 移动端：小屏幕手机 */
@media screen and (max-width: 619px) {
    header.nav {
        padding: 10px 5px;
    }

    header.nav.sticky {
        padding: 2px 6px;
    }

    header.nav ul li a {
        margin: 0 5px;
        letter-spacing: 1px;
    }

    .ls-logo{
        position: absolute;
        width: 75px;
        height: 50px;
        top: 4px;
        left: 5px;
    }
    .ls-logo img{
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .sec-arrow-left,
    .sec-arrow-right {
        top: calc(50vh - 17.5px);
        width: 15px;
        height: 35px;
        font-size: 30px;
    }
}