/* 历史沿革页面样式 */
.page-banner {
    margin-top: 80px;
    background: linear-gradient(rgba(30, 75, 148, 0.8), rgba(30, 75, 148, 0.9)), url('../images/banner-history.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    padding: 4rem 2rem;
}

.page-banner h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* 时间线样式 */
.history-timeline {
    padding: 4rem 0;
    background-color: var(--secondary-color);
}

.timeline-wrapper {
    position: relative;
    padding: 2rem 0;
}

.central-line {
    position: absolute;
    width: 4px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.timeline-item {
    width: 100%;
    margin-bottom: 4rem;
    position: relative;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

.timeline-content {
    width: calc(50% - 50px);
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    position: relative;
    transition: transform 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-5px);
}

/* 左侧时间线项目 */
.timeline-item.left .timeline-content {
    margin-right: auto;
}

.timeline-item.left .timeline-content::after {
    content: '';
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translateY(-50%);
    border-left: 10px solid white;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
}

/* 右侧时间线项目 */
.timeline-item.right .timeline-content {
    margin-left: auto;
}

.timeline-item.right .timeline-content::after {
    content: '';
    position: absolute;
    left: -10px;
    top: 50%;
    transform: translateY(-50%);
    border-right: 10px solid white;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
}

.year {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.content p {
    color: var(--dark-gray);
    margin-bottom: 1rem;
}

.achievements {
    list-style: none;
    margin: 0;
    padding: 0;
}

.achievements li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--dark-gray);
}

.achievements li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .central-line {
        left: 20px;
    }

    .timeline-item::after {
        left: 20px;
    }

    .timeline-content {
        width: calc(100% - 50px);
        margin-left: 40px !important;
    }

    .timeline-item.left .timeline-content::after,
    .timeline-item.right .timeline-content::after {
        left: -10px;
        border-right: 10px solid white;
        border-left: none;
    }

    .year {
        font-size: 1.8rem;
    }
}