/* 时间线样式 */
.timeline {
    position: relative;
    padding: 2rem 0;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, #667eea, #764ba2);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 100px;
}

.timeline-marker {
    position: absolute;
    left: 41px;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #667eea;
    border: 3px solid white;
    box-shadow: 0 0 0 3px #667eea;
    z-index: 2;
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.timeline-date {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.timeline-content p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 0.8rem;
}

.timeline-content strong {
    color: var(--primary-color);
}

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

    .timeline-item {
        padding-left: 60px;
    }

    .timeline-marker {
        left: 11px;
        width: 18px;
        height: 18px;
    }

    .timeline-content {
        padding: 1.5rem;
    }

    .timeline-content:hover {
        transform: none;
    }
}