/*====================================
    Timeline Vertical Layout
    发展历程时间线样式
====================================*/

.about-timeline {
    padding: 60px 0;
}

.about-timeline .timeline-wrapper {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 0;
}

/* 中间的垂直线 */
.about-timeline .timeline-wrapper::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom,
            #FFB84D 0%,
            #FF8C42 50%,
            #FFB84D 100%);
}

/* 时间线项目 */
.about-timeline .timeline-item {
    position: relative;
    width: 50%;
    padding: 15px 40px;
    margin-bottom: 30px;
    box-sizing: border-box;
    z-index: 1;
}

/* 奇数项（左侧） */
.about-timeline .timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
    padding-right: 60px;
}

/* 偶数项（右侧） */
.about-timeline .timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
    padding-left: 60px;
}

/* 时间线节点圆点 */
.about-timeline .timeline-dot {
    position: absolute;
    top: 25px;
    width: 16px;
    height: 16px;
    background-color: #fff;
    border: 3px solid #FF8C42;
    border-radius: 50%;
    z-index: 10;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 0 4px rgba(255, 140, 66, 0.15);
}

.about-timeline .timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}

.about-timeline .timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}

/* 悬停效果 */
.about-timeline .timeline-item:hover .timeline-dot {
    transform: scale(1.4);
    background-color: #FF8C42;
    box-shadow: 0 0 0 8px rgba(255, 140, 66, 0.2),
        0 0 20px rgba(255, 140, 66, 0.4);
}

/* 内容卡片 */
.about-timeline .timeline-content {
    position: relative;
    background-color: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.about-timeline .timeline-item:hover .timeline-content {
    transform: translateY(-8px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.12);
    border-color: #FF8C42;
}

/* 年份标签 */
.about-timeline .timeline-year {
    display: inline-block;
    color: #FF8C42;
    font-weight: 700;
    font-size: 26px;
    margin-bottom: 10px;
    position: relative;
    letter-spacing: 0.5px;
}

/* 标题 */
.about-timeline .timeline-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--heading-font-color);
    line-height: 1.4;
}

/* 描述文本 */
.about-timeline .timeline-content p {
    color: var(--body-font-color);
    line-height: 1.8;
    font-size: 15px;
    margin: 0;
}

/* 响应式设计 - 移动端 */
@media (max-width: 767px) {
    .about-timeline .timeline-wrapper {
        padding: 30px 0;
    }

    .about-timeline .timeline-wrapper::before {
        left: 30px;
    }

    .about-timeline .timeline-item {
        width: 100%;
        padding-left: 80px !important;
        padding-right: 20px !important;
        text-align: left !important;
        left: 0 !important;
        margin-bottom: 35px;
    }

    .about-timeline .timeline-item:nth-child(odd) .timeline-dot,
    .about-timeline .timeline-item:nth-child(even) .timeline-dot {
        left: 21px;
        right: auto;
    }

    .about-timeline .timeline-content {
        padding: 25px;
    }

    .about-timeline .timeline-year {
        font-size: 24px;
    }

    .about-timeline .timeline-title {
        font-size: 18px;
    }
}

/* 平板设备 */
@media (min-width: 768px) and (max-width: 991px) {
    .about-timeline .timeline-wrapper {
        max-width: 700px;
    }

    .about-timeline .timeline-item {
        padding: 15px 40px;
    }

    .about-timeline .timeline-content {
        padding: 28px;
    }
}