* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Helvetica, "PingFang SC", "Microsoft Yahei", sans-serif;
    font-size: 14px;
}

body::-webkit-scrollbar {
    display: none; /* Chrome Safari 滚动条影响100vw */
}

img {
    width: 100%;
}

/* 变量 */

:root {
    --primary-color: #007aff;
    --secondary-color: #e3e3e3;
    --text-color-lightest: #e7e9ec;
    --text-color-darker: #2e2e2e;
    --text-color-darkest: #000000;
    --text-color-dark: #494949;
    --text-color-gray: #8b8b8b;
    --text-color-dark-gray: #727272;
    --text-color-light-gray: #c6c6c6;
    --backdrop-color: rgba(42, 42, 42, 0.69);
}

header {
    height: 60px;
    width: 100vw;
    z-index: 200;
    display: flex;
    justify-content: center;
    align-items: center;
}

.header-wrapper {
    width: 1180px;
    display: grid;
    grid-template-columns: auto 6fr;

}

.logo {
    margin-left: 20px;
}

.logo img {
    height: 28px;
}

td:nth-child(2) {
    text-align: center;
    padding-left: 20px;
}


header nav {
    justify-self: end;
}

header nav i {
    color: var(--text-color-darker);
}

header nav a {
    color: var(--text-color-darker);
    text-decoration: none;
    margin: 0 24px;
}

header .burger {
    margin: auto;
    display: none;
}

header.sticky {
    position: fixed;
    background-color: white;
    box-shadow: 0 0 18px rgba(0, 0, 0, 0.02);
    animation: dropDown 0.5s ease-in-out forwards;
}

header.sticky .logo,
header.sticky nav a,
header.sticky nav i {
    color: var(--text-color-darker);
}

@keyframes dropDown {
    from {
        transform: translateY(-100px);
    }
    to {
        transform: translateY(0);
    }
}

.home_banner {
    width: 100vw;
    background: var(--text-color-darkest);
}

.banner {
    max-width: 1180px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    height: 100%;
}

.banner_desc {
    text-align: left;
    display: flex;
    flex-flow: column;
    padding: 0 20px;
}

.banner_media {
    height: 100%;
}

.banner_item {
    padding: 30px 0;
}

.banner_desc h1 {
    font-size: 50px;
    color: var(--text-color-lightest);
}

.banner_desc h2 {
    font-size: 20px;
    color: var(--text-color-light-gray);
}

.banner_desc table {
    font-size: 14px;
    color: var(--text-color-light-gray);
}

.banner_desc p {
    font-size: 14px;
    color: var(--text-color-light-gray);
}

.banner_media img {
    width: 100%;
    height: 100%;
    padding: 30px 20px;
    object-fit: cover;
}


.show-btn {
    justify-self: end;
}

.show-btn button {
    padding: 5px 10px;
    background-color: var(--primary-color);
    border: 0;
    border-radius: 4px;
    color: var(--text-color-lightest);
    font-size: 14px;
    cursor: pointer;
    outline: none;

}

.explore-btn {
    width: 50%;;
    padding: 14px 32px;
    background-color: var(--primary-color);
    border: 0;
    border-radius: 4px;
    color: var(--text-color-lightest);
    font-size: 18px;
    cursor: pointer;
    outline: none;
}

/* 内容区域 */
/* 通用样式 */
.content-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

section {
    display: grid;
    justify-items: center;
    max-width: 1180px;
    padding: var(--text-color-darker);
    margin-top: 18px;
}

.section-bg {
    position: relative;
}

.section-bg::before {
    content: "";
    display: block;
    position: absolute;
    background-color: #f9fbfb;
    width: 100vw;
    height: 100%;
    z-index: -1;
}

.title1 {
    font-size: 34px;
    color: var(--text-color-darker);
}

.title1::after {
    content: "";
    display: block;
    width: 80%;
    height: 4px;
    background-color: var(--primary-color);
    margin-top: 14px;
    transform: translateX(10%);
}

.intro {
    margin: 28px 0 60px 0;
    font-size: 18px;
    color: var(--text-color-dark-gray);
}

/*使用说明*/
.guide-menus {
    width: 100%;
    max-width: 1180px;
    display: grid;
    grid-template-columns: 1fr;
    position: relative;
}

.guide-title {
    font-size: 18px;
    padding-bottom: 8px;
}

.guide-items {
    justify-self: start;
}

.guide-items p:not(:first-child) {
    padding-bottom: 16px;
    font-size: 15px;
}

.guide-items li {
    list-style: none;
    padding-bottom: 8px;
}

.guide-items li li {
    list-style: square;
    margin-left: 30px;
    padding-top: 8px;
    font-size: 15px;
}

/* 关于我们 */
.about-us {
    padding-bottom: 32px;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: 126px 126px;
    column-gap: 5vw;
}

.feature {
    display: grid;
    grid-template-areas:
    "icon title"
    "icon content";
    grid-template-columns: 60px 1fr;
    grid-template-rows: 1fr 3fr;
}

.feature i.fas {
    grid-area: icon;
    font-size: 34px;
    color: var(--primary-color);
}

.feature-title {
    grid-area: title;
    font-size: 18px;
    color: var(--text-color-darker);
}

.feature-content {
    grid-area: content;
    color: var(--text-color-gray);
    margin-top: 8px;
}


/* 设备包装 */
.pkg {
}

.pkg-list {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: 1fr auto;
    column-gap: 38px;
    row-gap: 34px;
}

.pkg-item {
    display: grid;
    grid-template-areas:
    "icon title"
    "icon content";
    text-align: center;
    padding: 24px;
    box-shadow: 0 0 18px rgba(0, 0, 0, 0.06);
}

.pkg-item i.fas {
    grid-area: icon;
    font-size: 42px;
    color: var(--primary-color);
    padding-top: 6px;
}

.pkg-item .pkg-title {
    grid-area: title;
    color: var(--text-color-darker);
    font-size: 24px;
}

.pkg-item .pkg-content {
    grid-area: content;
    color: var(--text-color-gray);
    line-height: 30px;
    font-size: 16px;
    margin-top: 8px;
}


.equipment-structures {
    max-width: unset;
}

.equipment-structures .intro {
    margin-top: 40px;
    margin-bottom: 38px;
}

.equipment-structures .structures {
    width: 100vw;
}

.equipment-structures .structure {
    width: 25vw;
    height: 20vw;
    overflow: hidden;
}

.structure img {
    /*height: 100%;*/
    object-fit: cover;
}


.structure:hover {
    transform: translateY(-20px) scale(1.05);
    box-shadow: 0 0 36px rgba(0, 0, 0, 0.1);
}

/* 团队介绍 */
.team-intro {
}

.team-members {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
}

.team-member {
    background-color: white;
    box-shadow: 0 0 24px rgba(0, 0, 0, 0.02);
    text-align: center;
    /*padding-bottom: 28px;*/
    transition: 0.4s;
    display: grid;
    justify-items: center;
}


.social-links {
    width: 100%;
    max-width: 200px;
    display: flex;
    justify-content: space-between;
    padding: 0 75px;
}

.social-links li {
    list-style: none;
}

.social-links li a {
    color: var(--text-color-dark);
    text-decoration: none;
}


.operation-video   {
    width: 100vw;
}

#video-player {
    width: 81%;
    height: 61vh;
}

/* 底部信息 */
footer {
    margin-top: 124px;
    background-color: #181818;
    display: grid;
    justify-items: center;
    padding-top: 72px;
    padding-bottom: 24px;
}

.footer-menus {
    width: 100%;
    max-width: 1180px;
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    padding: 0 80px;
    position: relative;
}

.menu-title {
    font-size: 16px;
    color: white;
    font-weight: 500;
    margin-bottom: 20px;
}

.contact-us {
    justify-self: start;
    color: var(--text-color-lightest);
}

.contact-us p:not(:first-child) {
    padding-bottom: 16px;
    font-size: 15px;
    color: var(--text-color-lightest);
}

.menu-items li {
    list-style: none;
    padding-bottom: 8px;
}

.menu-items li a {
    text-decoration: none;
    font-size: 15px;
    color: var(--text-color-lightest);
}

.icp-info {
    margin-top: 24px;
    margin-bottom: 16px;
}

.icp-info,
.rights {
    grid-column: 1 / -1;
    justify-self: center;
    color: white;
}

.scrollToTop {
    display: none;
    position: relative;
    z-index: 300;
}

.scrollToTop a {
    width: 32px;
    height: 32px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    position: fixed;
    bottom: 60px;
    right: 30px;
}

li {
    list-style-type: circle;
}

li li {
    list-style-type: square;
}

/* 响应式 */
@media (max-width: 1105px) {
    header nav, .show-btn {
        display: none;
    }

    header {
        grid-template-columns: repeat(2, 1fr);
    }

    header .burger {
        display: block;
        width: 20px;
        height: 6px;
        position: relative;
        justify-self: end;
        cursor: pointer;
    }

    .burger-line1,
    .burger-line2,
    .burger-line3 {
        width: 20px;
        height: 2px;
        background-color: var(--text-color-lightest);
    }

    .burger-line1 {
        position: absolute;
        top: -6px;
    }

    .burger-line3 {
        position: absolute;
        top: 6px;
    }

    header.open nav {
        display: grid;
        position: absolute;
        left: 0;
        top: 0;
        width: 100vw;
        height: 100vh;
        background-color: white;
        grid-auto-rows: max-content;
        justify-items: end;
        padding: 0 75px;
        opacity: 0;
        animation: slideDown 0.6s ease-out forwards;
    }

    header.open nav > * {
        color: var(--text-color-darker);
        animation: showMenu 0.5s linear forwards 0.4s;
        font-size: 18px;
        margin: 4px 0;
        opacity: 0;
    }

    header.open nav > i.fas {
        margin-top: 10px;
        cursor: pointer;
    }

    header.sticky .burger-line1,
    header.sticky .burger-line2,
    header.sticky .burger-line3,
    header.open .burger-line1,
    header.open .burger-line2,
    header.open .burger-line3 {
        background-color: var(--text-color-darker);
        transition: 0.4s ease;
    }

    header.open .burger-line1 {
        transform: rotate(45deg) translate(3px, 5px);
    }

    header.open .burger-line2 {
        transform: translateX(5px);
        opacity: 0;
    }

    header.open .burger-line3 {
        transform: rotate(-45deg) translate(3px, -5px);
    }

    header.open .logo {
        z-index: 40;
        color: var(--text-color-darker);
    }

    @keyframes slideDown {
        from {
            height: 0;
            opacity: 0;
        }
        to {
            height: 100vh;
            padding-top: 80px;
            opacity: 1;
        }
    }
    @keyframes showMenu {
        from {
            opacity: 0;
            transform: translateY(-1vh);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .pkg-item .pkg-title {
        font-size: 20px;
    }

    .pkg-item .pkg-content {
        font-size: 14px;
        line-height: 24px;
    }

    .team-members {
        grid-template-columns: repeat(2, 1fr);
        row-gap: 36px;
        column-gap: 6vw;
    }

    .activities {
        grid-template-columns: repeat(2, 1fr);
        row-gap: 36px;
    }

    .banner {
        flex-flow: column;
        height: auto;
    }

    .banner_desc,.banner_media  {
        width: auto;
    }

}

@media (max-width: 995px) {
    .slide-caption h1 {
        font-size: 48px;
    }

    .slide-caption h3 {
        font-size: 18px;
    }

    .features,
    .pkg-list {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: unset;
    }

    .data-section {
        grid-template-columns: repeat(2, minmax(200px, auto));
        padding: 24px 0;
        height: auto;
        row-gap: 24px;
        background-size: 200%;
    }

    .equipment-structures .structure {
        width: calc(100vw / 3);
    }
}

@media (max-width: 770px) {
    section,
    .footer-menus {
        margin: 0 30px;
    }

    .footer-menus {
        grid-template-columns: 2fr repeat(2, 1fr);
        row-gap: 24px;
    }

    .contact-us {
        grid-row: 1/3;
    }

    .footer-menu {
        text-align: right;
    }

    .activities {
        grid-template-columns: 1fr;
        row-gap: 36px;
    }

    .data-section {
        grid-template-columns: 1fr;
        background-size: 350%;
    }

    .team-members {
        grid-template-columns: minmax(200px, 400px);
    }

    .feature,
    .pkg-list {
        grid-template-columns: 1fr;
    }

    .equipment-structures .structure {
        width: calc(100vw / 2);
        height: 30vw;
    }
}

@media (max-width: 576px) {
    .slide-caption h1 {
        font-size: 28px;
    }

    .slide-caption h3 {
        font-size: 14px;
    }

    .explore-btn {
        font-size: 14px;
        padding: 8px 18px;
    }

    .equipment-structures .structure {
        width: 100vw;
        height: 60vw;
    }

    .footer-menus {
        grid-template-columns: 1fr;
    }

    .footer-menu {
        justify-self: start;
        text-align: left;
    }
}