.center {
    width: 100%;
}

/*简介开始*/
.about-section {
    margin: 0 auto;
    width: var(--center-width);
    background-color: #fff;
    padding: 5.5rem 4.5rem;
    gap: 5rem;
}

.about-left {
    width: 31rem;
    gap: 3.5rem;
}

.about-right {
    width: 55rem;
    gap: 3.5rem;
}

.countdown-section, .date-section {
    height: 30rem;
}

.countdown-day, .date-number {
    width: 10.5rem;
    background-color: var(--color-primary);
}

.countdown-day > h2, .countdown-date > section > h2 {
    font-size: 3.2rem;
}

.countdown-day > * {
    text-align: center;
    color: #fff;
}

.countdown-date, .date-content {
    width: calc(100% - 10.5rem);
    gap: .6rem;
}

.countdown-date > section {
    height: calc((100% - (.6rem * 2)) / 3);
    border: .1rem solid #00B293;
    border-left: none;
}

.countdown-date > section > p {
    text-align: center;
}

.date-number, .date-content {
    gap: 1.4rem !important;
}

.date-number > h2, .date-content > section {
    height: calc((100% - (1.4rem * 3)) / 4);
}

.date-number > h2 {
    color: #fff;
}

.date-content > section {
    padding: 0 .5rem;
    border: .1rem solid #00B293;
    border-left: none;
}

.date-content > section > p {
    text-align: start;
}

.about-right > p {
    white-space: pre-wrap;
    text-align: justify;
    line-height: 2;
}

.papers-section {
    width: 38rem;
    padding: 1rem;
    background: #FFFFFF;
    box-shadow: 0 .5rem .9rem 0 rgba(0, 0, 0, 0.07);
}

.papers-header {
    border-bottom: .1rem solid #000;
}

.papers-title {
    gap: .5rem;
}

.papers-title > h2:nth-child(2n+1) {
    color: #000;
    font-size: 2rem;
}

.papers-header > p {
    text-align: center;
    color: var(--color-primary);
}

.papers-section > p {
    text-align: center;
}

.papers-section > a {
    text-align: center;
    padding: 1rem 1.5rem;
    font-weight: bold;
    color: var(--color-primary);
    box-shadow: 0 .5rem .9rem 0 rgba(0, 0, 0, 0.07);
}

.group-section {
    width: 60rem;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border: .1rem solid var(--color-primary);
}

.teacher-section {
    padding: 1rem 1.5rem;
    background: linear-gradient(263deg, #FFFFFF 0%, #E0F6F0 46%, #00B293 100%)
}

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

.teacher-text {
    flex: 1;
}

.teacher-text > p {
    color: var(--color-primary);
    text-align: end;
}

.line {
    background-color: #E0F6F0;
}

.line > h2 {
    text-align: start;
    width: var(--center-width);
    padding: .5rem 2rem;
    font: 2rem SourceHanSansCN-Regular, serif;
    border-left: .5rem solid var(--color-primary);
}

.guidelines-section {
    gap: 5rem;
}

.guidelines-item {
    width: 30rem;
    align-items: center;
    padding: .5rem;
    background-color: var(--color-primary);
}

.guidelines-item > * {
    color: #fff;
}

.guidelines-item > svg {
    width: 4.5rem;
}

.indexing-section > img {
    flex-grow: 0;
}

/*桌面端*/
@media (min-width: 999px) {
    .indexing-section {
        gap: 5rem;
    }

    .indexing-section > img {
        width: 16rem;
    }
    .sponsor-section{
        gap: 4rem;
    }
    .sponsor-section > img {
        width: 22rem;
    }
    
}

/*移动端*/
@media (max-width: 1000px) {
    .indexing-section {
        gap: 1rem;
    }

    .indexing-section > img {
        width: calc((100% - 1rem) /2);
    }
    .sponsor-section{
        gap: 2rem;
    }
    .sponsor-section > img {
        width: calc((100% - 2rem) /2);
    }
}

.sponsor-section > img {
    box-shadow: 0 .7rem 1.3rem 0 rgba(0, 0, 0, 0.07);
    padding: .5rem 1rem;
    background-color: #fff;
}

.statement-section > section {
    width: 49rem;
    padding: 1rem 1.5rem;
    border: .1rem solid #00B293;
}
