.section-title {
    font-size: 3.2rem;
    color: #0e387a;
    text-align: center;
    margin-bottom: 4rem;
    font-weight: bold;
    display: inline-block;
    position: relative;
}

.section-title-wrap {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title.green-border {
    padding-bottom: 1.5rem;
}

.section-title.green-border::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 6rem;
    height: 0.3rem;
    background: #27ae60;
}


.tech-section {
    padding: 8rem 0 6rem;
}

.about-tit{
    color: #004693;
    font-size: 6.8rem;
    font-weight: bold;
    line-height: 2.2;
    position: relative;
    padding-bottom: 2rem;
}

.about-tit::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    display: inline-block;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, #004693, #60ce94);
}
.about-tit span{
    color: #333;
    font-size: 2.8rem;
    font-weight: normal;
    line-height: 1;
    display: block;
}

.tech-header {
    text-align: center;
    margin: 0 auto 5rem;
}

.tech-section .about-tit{ 
    text-align: center;
    margin-bottom: 4rem;
    line-height: 2.2;
    padding-bottom: 0;
}

.tech-header h4 {
    font-size: 2.8rem;
    color: #444;
    margin-bottom: 1.5rem;
}

.tech-header p {
    font-size: 2rem;
    color: #777;
    line-height: 1.5;
}

.process-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 7rem 0;
}
.process-row img{
    width: 8rem;
}

.process-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    flex: 1;
}

.process-item .icon-placeholder {
    width: 14rem;
    height: 14rem;
}

.process-item h4 {
    font-size: 2.8rem;
    color: #444;
    font-weight: normal;
}

.journal-section {
    padding: 7rem 0 10rem;
    background: #eaedf5;
}

.papers-grid {
    display: grid; 
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    margin-top: 6.5rem;
}

.paper-card {
    background: #fff url(../images/UNWEN_15.jpg) no-repeat right bottom;
    border-radius: 0.5rem;
    padding: 5.8rem 4.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 0.2rem 1.2rem rgba(0, 0, 0, 0.03);
    transition: transform 0.3s;
    width: 100%;
    position: relative;
    overflow: visible !important;
}

.paper-card:hover h4 {
    color: #004693;
}

.paper-card:hover::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    display: inline-block;
    width: calc(100% - 44px);
    height: 5px;
    background: linear-gradient(to right, #004693, #60ce94);
}

.paper-card:hover {
    transform: translateY(-0.5rem);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.06);
}

.paper-card .cover-img {
    width: 100%;
    height: 30rem;
    margin-bottom: 4.7rem;
    object-fit: contain;
}

.paper-card h4 {
    font-size: 2.6rem;
    color: #444;
    width: 100%;
    margin-bottom: 1rem;
    line-height: 1.6;
    height: 8.32rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    word-break: break-word;
}

.paper-card .meta {
    font-size: 2rem;
    color: #777;
    width: 100%;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    height: 12.8rem;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.paper-card .btn-download {
    color: #fff;
    border-radius: 15px;
    font-size: 1.8rem;
    cursor: pointer;
    transition: 0.3s;
    font-weight: 500;
    padding: 2rem 2rem 2rem 8rem;
    background: #004693 url(../images/lunwen_11.png) no-repeat 3.5rem center;
    background-size: 2.5rem auto;
    align-self: flex-start;
}

.report-section {
    padding: 6rem 0 8rem;
}

.report-list {
    flex-direction: column;
    margin-top: 6rem;
}

.report-item {
    display: flex;
    align-items: center;
    background: #eaedf5 url(../images/baijiao_33.jpg) no-repeat right bottom;
    padding: 3.5rem 6rem;
}

.report-item:hover .info h4 {
    color: #004693;
}

.report-item:hover::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    display: inline-block;
    width: calc(100% - 44px);
    height: 5px;
    background: linear-gradient(to right, #004693, #60ce94);
}

.report-item .icon-doc {
    width: 16rem;
    height: 22rem;
    object-fit: contain;
    margin-right: 6rem;
}

.report-item .info {
    flex: 1;
}

.report-item .info h2 {
    font-size: 2.8rem;
    margin-bottom: 0.8rem;
    font-weight: bold;
    padding-left: 3.7rem
}
.report-item .info h2.type_1 {
    color: #157f47;
    background: url(../images/h4_48.jpg) no-repeat left center;
    background-size: 2.8rem auto;
}
.report-item .info h2.type_2 {
    color: #004693;
    background: url(../images/h4_44.jpg) no-repeat left center;
    background-size: 2.8rem auto;
}

.report-item .info h4 {
    font-size: 2.8rem;
    color: #444;
    margin-bottom: 0.8rem;
    /*white-space: nowrap;*/   
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}

.report-item .info p {
    font-size: 1.8rem;
    color: #777;
    margin-top: 6rem;
}

.report-item .info p .tag {
    display: inline-block;
    background: #157f47;
    color: #fff;
    padding: 0 2rem;
    margin-right: 1rem;
    font-weight: 500;
    line-height: 3.6rem;
    border-radius: 1.8rem;
}

.load-more-wrap {
    text-align: center;
    margin-top: 8rem;
}

.load-more-btn {
    display: inline-flex;
    color: #444;
    font-size: 1.8rem;
    cursor: pointer;
    transition: 0.3s;
    border: none;
    flex-direction: column;
    background: none;
    align-items: center;
    gap: 1rem;
}

.load-more-btn::before{
    content: '';
    display: none; 
    width: 6rem;
    height: 6rem;
    background: url('../images/loading.png') no-repeat center center;
    background-size: contain;
    animation: spin 1s linear infinite;
}

.load-more-btn.loading::before {
    display: inline-block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}


.title-tooltip-panel {
    position: absolute;
    z-index: 9999;
    background-color: #0F52BA;
    color: #ffffff;
    padding: 14px ;
    font-size: 14px;
    line-height: 1.6;
    width: 110%;
    box-shadow: 0 8px 28px rgba(15, 82, 186, 0.35);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    left: 50%;
    top: 40rem;  
    transform: translateX(-50%);
}

/* 向上的三角箭头 */
.title-tooltip-panel::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid #0F52BA;
}

/* 悬停卡片时显示浮层 */
.paper-card:hover .title-tooltip-panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* =========== 手机端响应式样式 (屏幕宽度 < 768px) =========== */
@media (max-width: 767px) {

    /* ---------- 核心技术区 ---------- */
    .tech-section {
        padding: 4rem 0 3rem;
    }

    .about-tit {
        font-size: 3.2rem;
        line-height: 1.4;
        padding-bottom: 0.8rem;
        text-align: center;
        margin-bottom: 2.5rem;
    }

    .about-tit::before {
        height: 3px;
        left: 50%;
        transform: translateX(-50%);
        width: 60%;
    }

    .tech-header {
        margin-bottom: 3rem;
    }

    .tech-header h4 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }

    .tech-header p {
        font-size: 1.4rem;
        line-height: 1.8;
    }

    /* 流程图改为两行两列 */
    .process-row {
        flex-wrap: wrap;
        justify-content: space-around;
        margin: 4rem 0;
        gap: 2rem 0;
    }
    .about-tit span{
        font-size: 1.4rem;
        line-height: 1.6;
    }

    .process-row img {
        display: none;  /* 隐藏箭头图标，用CSS绘制或直接省略 */
    }

    .process-item {
        flex: 1 1 45%;
        min-width: 12rem;
    }

    .process-item .icon-placeholder {
        width: 8rem;
        height: 8rem;
    }

    .process-item h4 {
        font-size: 1.6rem;
        margin-top: 0.5rem;
    }

    /* ---------- 国际学术期刊论文 ---------- */
    .journal-section {
        padding: 4rem 0;
    }

    .papers-grid {
        grid-template-columns: 1fr;    /* 单列显示 */
        gap: 2rem;
        margin-top: 3rem;
    }

    .paper-card {
        padding: 2.5rem 2rem;
        background-size: auto 8rem;
        background-position: right bottom;
    }

    .paper-card .cover-img {
        height: 18rem;
        margin-bottom: 2rem;
    }

    .paper-card h4 {
        font-size: 1.8rem;
        display: block;
        -webkit-line-clamp: unset;
        overflow: visible;
        white-space: normal;
        text-overflow: unset;
        height: auto;
    }

    .paper-card .meta {
        font-size: 1.3rem;
        -webkit-line-clamp: 2;
        height: auto;
    }

    .paper-card .btn-download {
        font-size: 1.3rem;
        padding: 1.2rem 1.5rem 1.2rem 6rem;
        background-position: 2rem center;
        background-size: 2rem auto;
    }

    /* 移除底部渐变伪元素 (避免宽度计算问题) */
    .paper-card:hover::before {
        display: none;
    }

    /* ---------- 国际HPV学术大会报告 ---------- */
    .report-section {
        padding: 4rem 0;
    }

    .report-list {
        margin-top: 3rem;
    }

    .report-item {
        flex-direction: column;
        align-items: flex-start;
        padding: 2.5rem 2rem;
        background-size: auto 6rem;
        background-position: right bottom;
    }

    .report-item .icon-doc {
        width: 10rem;
        height: 14rem;
        margin-right: 0;
        margin-bottom: 1.5rem;
    }

    .report-item .info {
        width: 100%;
    }

    .report-item .info h2 {
        font-size: 1.8rem;
        padding-left: 2.5rem;
        background-size: 1.8rem auto;
    }

    .report-item .info h4 {
        font-size: 1.6rem;
        white-space: normal;    /* 允许换行 */
        line-height: 1.4;
    }

    .report-item .info p {
        font-size: 1.2rem;
        margin-top: 1.5rem;
    }

    .report-item .info p .tag {
        font-size: 1.1rem;
        line-height: 2.4rem;
        padding: 0 1.2rem;
        border-radius: 1.2rem;
        margin-right: 0.5rem;
    }

    /* 移除底部渐变伪元素 */
    .report-item:hover::before {
        display: none;
    }

    /* 加载更多按钮 */
    .load-more-wrap {
        margin-top: 3rem;
    }

    .load-more-btn {
        font-size: 1.4rem;
    }

    .load-more-btn::before {
        width: 4rem;
        height: 4rem;
    }

    /* ---------- 通用容器 ---------- */
    .container {
        width: 92%;
        padding: 0;
    }

    .title-tooltip-panel {
        display: none !important; 
    }
}