/* 头部banner */
.intro-banner {
    height: 300px;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url(images/内蒙古工业大学白天.jpg) center/cover no-repeat;
    transition: background 0.3s ease;
}
body.night-mode .intro-banner {
    background: linear-gradient(rgba(0,0,0,0.8), rgba(0,0,0,0.8)), url(images/内蒙古工业大学夜晚.jpg) center/cover no-repeat;
}
.intro-banner-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
    z-index: 10;
}
.intro-banner-text h1 {
    font-size: 36px;
    margin-bottom: 12px;
    letter-spacing: 1px;
}
.intro-banner-text p {
    font-size: 18px;
    opacity: 0.9;
}

/* 板块一：核心信息（三列两行布局） */
.intro-section1 {
    margin-bottom: 80px;
    padding: 30px 0;
}
.intro-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    row-gap: 40px;
}
.intro-card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(22,93,255,0.08);
    padding: 24px;
    transition: all 0.3s ease;
}
body.night-mode .intro-card {
    background-color: #2C3036;
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.intro-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 16px rgba(22,93,255,0.12);
}
body.night-mode .intro-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}
.intro-card h3 {
    font-size: 18px;
    color: #165DFF;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
}
.intro-card h3::before {
    content: "";
    width: 4px;
    height: 20px;
    background-color: #165DFF;
    margin-right: 8px;
    border-radius: 2px;
}
.intro-card p {
    font-size: 14px;
    color: #4E5969;
    line-height: 1.8;
}
body.night-mode .intro-card p {
    color: #E5E6EB;
}

/* 板块二：坤班负责人 + 通用板块标题 */
.intro-section2 {
    margin-bottom: 80px;
    padding: 30px 0;
}
.section-title {
    text-align: center;
    margin-bottom: 40px;
}
.section-title h2 {
    font-size: 28px;
    color: #000;
    margin-bottom: 8px;
    display: inline-block;
    border-bottom: 2px solid #165DFF;
    padding-bottom: 6px;
    background: rgba(255,255,255,0.8);
    padding: 0 20px 6px;
    border-radius: 4px 4px 0 0;
}
body.night-mode .section-title h2 {
    color: #fff;
    border-bottom: 2px solid #fff;
    background: rgba(29,33,41,0.8);
}
.leader-container {
    display: flex;
    align-items: flex-start;
    gap: 40px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(22,93,255,0.08);
    padding: 30px;
    margin-bottom: 20px;
}

/* .dash{
    border-style: dashed;
} */
body.night-mode .leader-container {
    background-color: #2C3036;
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.leader-avatar {
    flex: 0 0 180px;
    text-align: center;
}
.leader-avatar img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #F2F3F5;
}
body.night-mode .leader-avatar img {
    border-color: #373B41;
}
.leader-avatar p {
    margin-top: 12px;
    font-size: 16px;
    font-weight: 600;
    color: #000;
}
body.night-mode .leader-avatar p {
    color: #fff;
}
.leader-timeline {
    flex: 1;
}
.timeline-item {
    margin-bottom: 20px;
    padding-left: 24px;
    position: relative;
    border-left: 2px solid #165DFF;
    padding-bottom: 20px;
}

.timeline-item .md-h3{
    color:#165DFF;

}

.timeline-item .md-h2{
    color:#165DFF;
}

.timeline-item .md-b{
    color:#165DFF;
}

.timeline-item:last-child {
    border-left: 2px solid transparent;
    margin-bottom: 0;
    padding-bottom: 0;
}
/* .timeline-item::before {
    content: "";
    position: absolute;
    left: -8px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #165DFF;
} */
.timeline-time {
    font-size: 14px;
    color: #165DFF;
    font-weight: 600;
    margin-bottom: 6px;
}
.timeline-content {
    font-size: 14px;
    color: #4E5969;
    line-height: 1.7;
}
body.night-mode .timeline-content {
    color: #E5E6EB;
}

/* 坤班简介页专属移动端适配 */
@media (max-width: 768px) {
    .intro-banner {
        height: 200px;
    }
    .intro-banner-text h1 {
        font-size: 24px;
    }
    .intro-banner-text p {
        font-size: 16px;
    }
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .leader-container {
        flex-direction: column;
        gap: 20px;
        padding: 20px;
    }
    .leader-avatar {
        flex: none;
        width: 100%;
    }
}