/* 全局样式重置和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background-color: #f8f9fa;

}

.container {
    /*max-width: 1200px;*/
    /*margin: 0 auto;*/
    /*padding: 20px;*/
}

.timeline-title {
    text-align: center;
    color: #333;
    margin-bottom: 40px;
    font-size: 2.2rem;
    position: relative;
}

.timeline-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(to right, transparent, #3498db, transparent);
    margin: 15px auto 0;
}

/* 时间轴容器样式 */
.timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 0;
}

/* 时间轴线样式 - 两头颜色逐渐减淡效果 */
.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 8px;
    transform: translateX(-50%);
    /*background: linear-gradient(to bottom,*/
    /*    rgba(52, 152, 219, 0) 0%,*/
    /*    rgba(52, 152, 219, 1) 15%,*/
    /*    rgba(52, 152, 219, 1) 85%,*/
    /*    rgba(52, 152, 219, 0) 100%);*/
    background: linear-gradient( 180deg, rgba(120,183,255,0) 0%, #78B7FF 50%, rgba(120,183,255,0) 100%);
    z-index: 1;
}

/* 时间点项目容器 */
.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
}

/* 时间点项目 - 右侧布局 */
.timeline-item:nth-child(odd) {
    left: 0;
}

/* 时间点项目 - 左侧布局 */
.timeline-item:nth-child(even) {
    left: 50%;
}

/* 时间节点样式 - 圆圈，与时间轴大小一样 */
.timeline-item::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    right: -3px;
    top: 49%;
    border-radius: 50%;
    background-color: #3498db;
    z-index: 2;
}

/* 调整偶数项（左侧）的节点位置 */
.timeline-item:nth-child(even)::after {
    left: -3px;
}

/* 调整偶数项（左侧）的节点位置 */
.timeline-item:nth-child(odd)::after {
    right: -3px;
}

/* 虚线连接线 */
.timeline-content {
    position: relative;
    /*padding: 20px;*/
    background-color: white;
    border-radius: 6px;
    width: 60%;
    height: 270px;
    /*box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);*/
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 左边的内容 */
.timeline-content:nth-child(odd) {
    /*background: #1e7e34;*/
}

/* 右边的内容 */
.timeline-content:nth-child(even) {
    background: #1e7e34;
}

/* 为右侧项目添加虚线连接 */
.timeline-item:nth-child(odd) .timeline-content::before {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    /*border: 15px solid transparent;*/
    border-left-color: white;
    right: -30px;
    top: 50%;
}

/* 为左侧项目添加虚线连接 */
.timeline-item:nth-child(even) .timeline-content::before {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    /*border: 15px solid transparent;*/
    border-right-color: white;
    left: -30px;
    top: 50%;
}

/* 左边的时间 */
.timeline-item:nth-child(odd) .timeline-date {
    position: absolute;
    top: 42%;
    right: -50%;
}

/* 右边的时间 */
.timeline-item:nth-child(even) .timeline-date {
    position: absolute;
    top: 42%;
    left: -80%;
}

/* 左边标题 */
.timeline-item:nth-child(odd) .timeline-title-card {
    position: absolute;
    top: 49%;
    right: -75%;
    width: 70%;
}

/* 右边标题 */
.timeline-item:nth-child(even) .timeline-title-card {
    position: absolute;
    top: 49%;
    left: -78%;
    width: 70%;
}

.timeline-item img {
    width: 100%;
    height: 100%;
}

/* 左边的虚线 */
.timeline-item:nth-child(odd)::before {
    content: '';
    position: absolute;
    width: 50%;
    height: 2px;
    background: repeating-linear-gradient(90deg, #e6e6e6, #d8d8da 5px, transparent 5px, transparent 10px);
    right: 0;
    top: 50%;
}

/*****右边内容******/
.timeline-item:nth-child(even) .timeline-content {
    right: -50%;
    /*background: #1e7e34;*/
}

/* 右边的虚线 */
.timeline-item:nth-child(even)::before {
    content: '';
    position: absolute;
    width: 50%;
    height: 2px;
    background: repeating-linear-gradient(90deg, #e6e6e6, #d8d8da 5px, transparent 5px, transparent 10px);
    /*background: #ccc;*/
    left: 0;
    top: 50%;
}

/* 时间点内容样式 */
.timeline-date {
    font-weight: bold;
    color: #000000;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.timeline-title-card {
    font-size: 1rem;
    color: #000000;
    font-weight: 400;
}

.timeline-description {
    color: #555;
    margin-bottom: 15px;
}

.timeline-icon {
    margin-right: 10px;
    color: #3498db;
}

/* 悬停效果 */
.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

/* 滚动到顶部按钮 */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #3498db;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: #2980b9;
    transform: translateY(-3px);
}