html, body {
    zoom: 1;
    transform: none;
}

:root {
    font-size: 10px;
    --center-width: 100rem;
    --color-primary: #1C4175;
}

* {
    font-size: 1.2rem;
    font-weight: normal;
    line-height: 1.5;
    font-family: SF Pro Text, SF Pro Icons, Helvetica Neue, Helvetica, Arial, sans-serif!important;
}

body {
    gap: 1rem;
    background-color: rgb(245, 245, 245);
}

/*桌面端*/
@media (min-width: 1019px) {
    :root {
        --center-width: 100rem
    }

    .mobile-menu {
        display: none;
    }

    header > h1 {
        display: block !important;
    }

    .desktop-menu {
        display: flex;
    }
}

/*移动端*/
@media (max-width: 1020px) {
    :root {
        --center-width: calc(100% - 2rem);
    }

    .mobile-menu {
        display: flex;
    }

    header > h1 {
        display: none !important;
    }

    .desktop-menu {
        display: none;
    }

    footer {
        display: none;
    }
}

header {
    width: 100%;
    position: fixed;
    z-index: 999;
    background-color: #fff;

    height: 6rem;
    border-top: .5rem solid var(--color-primary);
    border-bottom: .5rem solid var(--color-primary);
}

.countdown-section {
    width: 29rem;
    height: 3rem;
    background-color: var(--color-primary);
    box-shadow: .3rem -.3rem 0 0 #8DA0BA;
    padding: 0 .5rem;
    align-items: center;
}

.countdown-section > p {
    color: #fff;
}

header > h1 {
    background-color: #fff;
    color: #000;
    text-align: center;
    padding: 1rem 0;
    font: 1.6rem SourceHanSansCN-Regular, serif;
    border-top: .1rem solid #fff;
}

.desktop-menu {
    gap: 4rem;
}

.desktop-nav {
    width: calc(100% - 29rem - 4rem);
    align-items: center;
}

.desktop-nav > a {
    padding: .1rem 0;
    color: var(--color-primary);
}

.desktop-nav > .select, .desktop-nav > a:hover {
    color: var(--color-primary);
    border-bottom: .1rem solid var(--color-primary);
}

.mobile-menu {
    padding: 0 1rem;
    gap: 1rem;
}

.mobile-menu > h1 {
    font-weight: bold;
    width: calc(100% - 1.5rem);
    text-align: start;
}

.mobile-menu > button {
    border: none;
    cursor: pointer;
}

.mobile-menu > button > svg > path {
    fill: var(--color-primary);
}

/*蒙层*/
.mobile-mask {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9;
}

.mobile-mask-menu {
    width: 100vw;
    height: 100vh;
}

/*空白部分*/
.mobile-mask-blank {
    width: calc(100% - 25rem);
    background-color: #141414;
    opacity: .5;
}

/*菜单*/
.mobile-mask-menu-nav {
    padding: 0 2rem;
    width: 25rem;
    height: 100%;
    background-color: #ffffff;
}

.mobile-mask-menu-nav > a {
    padding: 2rem 0;
    border-bottom: .1rem solid #eee;
}

.mobile-mask-menu-nav > .select {
    color: var(--color-primary);
}

h1 {
    text-align: center;
    font-weight: bold;
}

h2 {
    color: var(--color-primary);
    font-size: 1.8rem;
    font-weight: bold;
}

p {
    text-align: justify;
    white-space: pre-wrap;
    color: var(--color-primary);
}


main {
    margin-top: 6.5rem;
    flex: 1;
}

.main-section, .center {
    width: var(--center-width);
    margin: 0 auto;
}

.gap-1 {
    gap: 1rem;
}

.gap-2 {
    gap: 2rem;
}

.padding-row-1 {
    padding: 0 1rem
}

.padding-row-2 {
    padding: 0 2rem
}

footer {
    text-align: center;
    padding: 2.5rem 0;
    color: #FFFFFF;
    background-color: var(--color-primary);
}

.left-section {
    width: 53rem;
}

.right-section {
    width: 42rem;
}

.border {
    border-radius: .4rem;
    border: 1px solid #e4e7ed;
    color: #303133;
    background-color: #fff;
    padding: .5rem 1.5rem;
}


.base-padding {
    padding: 6rem 3rem;
    box-shadow: 2px 3px 4px 1px rgba(0, 0, 0, 0.04);
}

.float-section {
    position: relative;
}

.float-section > h3 {
    text-align: center;
    position: absolute;
    color: #fff;
    background-color: var(--color-primary);
}

.float-title {
    padding: 0 2rem;
    height: 6rem;
    font-size: 2rem;
    top: -3rem;
}

.contact-section {
    width: 100%;
    padding: 6rem 0;
    background: url("../img/468ead3a5b619da8374330f3001bdbb.jpg");
}

.contact-center {
    border-bottom: .1rem solid #fff;
}

.contact-center > section {
    width: 50rem;
}

.contact-content > * {
    color: #fff;
}

.teacher-section {
    justify-content: end;
    padding: 1rem;
}

.teacher-section > section > p {
    color: #fff;
}

.teacher-section > img {
    width: 10rem;
}

.plagiarism-check > * {
    color: #fff;
}