/* 研究方向页：版心与首页一致；材料/感知固定各占 50%，无动画 */

:root {
    --research-split-left-tint: rgba(22, 50, 104, 0.72);
    --research-split-right-tint: rgba(10, 3, 46, 0.78);
    --research-split-btn-border: rgba(255, 255, 255, 0.92);
    --research-split-btn-hover-left: #163268;
    --research-split-btn-hover-right: #0a032e;
}

body.members-page.research-topics-page {
    background-color: #ebebeb;
    background-image: url("../../images/site/backgrounds/background.jpeg");
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

body.research-topics-page #research-topics .research-topics-sheet {
    width: 100%;
    max-width: none;
    margin: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
}

.research-split-hero--in-sheet {
    width: 100%;
    min-height: min(52vh, 560px);
    height: clamp(280px, min(56vh, 620px), 620px);
}

.research-split-root {
    position: relative;
    display: flex;
    flex-direction: row;
    width: 100%;
    height: 100%;
    min-height: 100%;
    overflow: hidden;
    background: #1a1a1a;
}

.research-split {
    position: relative;
    flex: 1 1 50%;
    width: 50%;
    height: 100%;
    overflow: hidden;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    outline: none;
}

.research-split::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
}

.research-split--left::before {
    background-color: var(--research-split-left-tint);
}

.research-split--right::before {
    background-color: var(--research-split-right-tint);
}

.research-split__content {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 1;
    transform: translate(-50%, -50%);
    width: min(92%, 100%);
    max-width: none;
    padding: 0 1rem;
    text-align: center;
    pointer-events: none;
}

.research-split__content a,
.research-split__content button {
    pointer-events: auto;
    cursor: pointer;
}

.research-split__icon {
    margin: 0 auto 0.75rem;
    display: flex;
    width: 3.25rem;
    height: 3.25rem;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    font-size: 1.35rem;
}

.research-split__title {
    margin: 0 0 0.65rem;
    font-size: clamp(1.65rem, 3.2vw, 2.85rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: 0.04em;
    color: #fff;
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);
}

.research-split__lead {
    margin: 0 0 1.25rem;
    font-size: clamp(0.8125rem, 1.35vw, 0.9375rem);
    line-height: 1.65;
    color: rgba(255, 255, 255, 0.9);
    display: block;
    overflow: visible;
}

.research-split__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 11rem;
    padding: 0.85rem 1.35rem;
    border: 2px solid var(--research-split-btn-border);
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: none;
    text-decoration: none;
    color: #fff;
}

.research-split--left .research-split__btn:hover,
.research-split--left .research-split__btn:focus-visible {
    background-color: var(--research-split-btn-hover-left);
    border-color: var(--research-split-btn-hover-left);
    color: #fff;
}

.research-split--right .research-split__btn:hover,
.research-split--right .research-split__btn:focus-visible {
    background-color: var(--research-split-btn-hover-right);
    border-color: var(--research-split-btn-hover-right);
    color: #fff;
}

.research-split__btn:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 3px;
}

.research-split-root--single .research-split {
    width: 100%;
    flex: 1 1 100%;
}

.research-split:focus-visible {
    z-index: 2;
    outline: 2px solid rgba(255, 255, 255, 0.85);
    outline-offset: -4px;
}

@media (max-width: 767.98px) {
    .research-split-hero--in-sheet {
        height: auto;
        min-height: 0;
    }

    .research-split-root {
        flex-direction: column;
        height: auto;
        min-height: 0;
    }

    .research-split {
        width: 100%;
        flex: 0 0 auto;
        height: auto;
        min-height: min(42vh, 360px);
    }
}

@media (prefers-reduced-motion: reduce) {
    body.members-page.research-topics-page {
        background-attachment: scroll;
    }
}

.research-split-detail {
    width: 100%;
    max-width: none;
    margin-top: 2.5rem;
    padding-bottom: 0.5rem;
}

.research-split-detail__grid {
    display: grid;
    gap: 1.5rem;
    width: 100%;
}

@media (min-width: 768px) {
    .research-split-detail__grid {
        grid-template-columns: 1fr 1fr;
        gap: 1.75rem;
        align-items: start;
    }
}

.research-split-detail__card {
    background: transparent;
    border: 0;
    border-top: 1px solid rgba(28, 25, 23, 0.12);
    box-shadow: none;
    padding: 1.35rem 0 1.5rem;
    scroll-margin-top: calc(var(--site-academic-header-offset, 9.75rem) + 1rem);
}

.research-split-detail__card h3 {
    margin: 0 0 0.75rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: #163268;
    letter-spacing: 0.04em;
}

.research-split-detail__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 1rem;
}

.research-split-detail__tag {
    display: inline-block;
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #163268;
    border: 1px solid rgba(22, 50, 104, 0.22);
    background: rgba(22, 50, 104, 0.08);
}

.research-split-detail__body {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.75;
    color: #374151;
    text-align: justify;
}