.container-wrapper {
        background: white;
        border-radius: 10px;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        overflow: hidden;
        max-width: 1200px;
        margin: 0 auto;
    }

    .containerheader {
        background: linear-gradient(135deg, #c6aa7f 0%, #a58c6c 100%);
        color: white;
        padding: 20px;
        text-align: center;

    }

    .column {
        padding: 15px;
        height: 80vh;
        overflow-y: auto;
    }

    .years-column {
        background-color: #f8f5f0;
        border-right: 1px solid #e9e1d4;
    }

    .months-column {
        background-color: #faf8f3;
        border-right: 1px solid #e9e1d4;
    }

    .events-column {
        background-color: #fdfcf9;
    }

    .list-item {
        padding: 10px 15px;
        margin-bottom: 8px;
        border-radius: 5px;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .year-item {
        background-color: #f2ebe1;
        border-left: 4px solid #c6aa7f;
    }

    .month-item {
        background-color: #f4eee5;
        border-left: 4px solid #b89b79;
    }

    .event-item {
        background-color: #f7f3ec;
        padding: 12px 15px;
        margin-bottom: 10px;
        border-radius: 5px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    }

    .list-item:hover {
        transform: translateX(5px);
    }

    .year-item:hover {
        background-color: #e9dfd0;
    }

    .month-item:hover {
        background-color: #ece4d8;
    }

    .event-item:hover {
        background-color: #f2eadd;
    }

    .xxactive {
        background-color: #c6aa7f;
        color: white;
        font-weight: bold;
    }

    .section-title {
        color: #c6aa7f;
        padding-bottom: 10px;
        margin-bottom: 15px;
        border-bottom: 2px solid #e9e1d4;
    }

    .instructions {
        color: #a8a8a8;
        font-style: italic;
        text-align: center;
        margin-top: 30px;
    }

    .event-date {
        font-size: 0.85rem;
        color: #c6aa7f;
        font-weight: bold;
        margin-bottom: 5px;
    }

    .event-content {
        color: #555;
    }

    .year-badge {
        font-size: 0.7rem;
        background-color: #a58c6c;
        color: white;
        padding: 2px 6px;
        border-radius: 10px;
        margin-left: 5px;
    }

    .latest-badge {
        font-size: 0.6rem;
        background-color: #d9534f;
        color: white;
        padding: 2px 5px;
        border-radius: 8px;
        margin-left: 5px;
    }

    @media (max-width: 768px) {
        .container-wrapper {
            border-radius: 0;
        }

        .column {
            height: auto;
            min-height: 200px;
            border-right: none;
            border-bottom: 1px solid #e9e1d4;
        }
    }

    /*时间轴*/



    .page-title {
        font-weight: 700;
        color: #343a40;
        margin-bottom: 2rem;
        position: relative;
        padding-bottom: 0.5rem;
    }

    .page-title:after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 3px;
        background: #c6aa7f;
    }

    /* 年份按钮样式 */
    .year-buttons {
        display: flex;
        justify-content: center;
        margin-bottom: 30px;
        flex-wrap: wrap;
        gap: 15px;
    }

    .year-btn {
        background: #fff;
        border: 2px solid #c6aa7f;
        color: #c6aa7f;
        padding: 10px 25px;
        border-radius: 50px;
        font-weight: 600;
        transition: all 0.3s ease;
        box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
        position: relative;
        overflow: hidden;
    }

    .year-btn:hover {
        background: #f8f3eb;
        transform: translateY(-3px);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
    }

    .year-btn.active {
        background: #c6aa7f;
        color: white;
        box-shadow: 0 5px 15px rgba(198, 170, 127, 0.4);
    }

    .year-btn.active:after {
        content: '';
        position: absolute;
        bottom: -5px;
        left: 50%;
        transform: translateX(-50%);
        width: 70%;
        height: 3px;
        background: #fff;
        border-radius: 2px;
    }

    .timeline {
        position: relative;
        padding: 20px 0;
        list-style: none;
    }

    /* 中间的竖线（主色） */
    .timeline:before {
        content: '';
        position: absolute;
        top: 0;
        bottom: 0;
        left: 50%;
        width: 3px;
        background: #c6aa7f;
        transform: translateX(-50%);
    }

    .timeline-item {
        position: relative;
        margin: 40px 0;
        width: 50%;
        padding: 0 20px;
        transition: all 0.5s ease;
    }

    .timeline-item .timeline-panel {
        background: #fff;
        border: 1px solid #dee2e6;
        border-radius: .5rem;
        padding: 20px;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        transition: all 0.3s ease;
        position: relative;
    }

    /* hover 卡片浮起效果 */
    .timeline-item .timeline-panel:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    /* 左右布局 */
    .timeline-item-left {
        left: 0;
        text-align: right;
        padding-right: 40px;
    }

    .timeline-item-right {
        left: 50%;
        padding-left: 40px;
    }

    /* 时间点圆圈（绝对定位，在panel外部） */
    .timeline-badge {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        width: 22px;
        height: 22px;
        background: #c6aa7f;
        border-radius: 50%;
        z-index: 3;
        border: 4px solid #fff;
        transition: all 0.3s ease;
        cursor: pointer;
        box-shadow: 0 0 0 2px #c6aa7f;
    }

    /* 左侧节点的圆点位置 */
    .timeline-item-left .timeline-badge {
        right: -11px;
    }

    /* 右侧节点的圆点位置 */
    .timeline-item-right .timeline-badge {
        left: -11px;
    }

    /* hover 高亮效果 */
    .timeline-badge:hover {
        background: #a2875f;
        transform: translateY(-50%) scale(1.3);
        box-shadow: 0 0 0 2px #a2875f, 0 0 12px rgba(198, 170, 127, 0.8);
    }

    /* 标题样式 */
    .timeline-panel h5 {
        color: #c6aa7f;
        font-weight: 600;
        margin-bottom: 0.8rem;
        border-bottom: 1px dashed #e9ecef;
        padding-bottom: 0.5rem;
    }

    /* 内容样式 */
    .timeline-panel p {
        line-height: 1.6;
        margin-bottom: 0;
        color: #555;
    }

    /* 年份标签 */
    .year-label {
        display: inline-block;
        background: #f8f3eb;
        color: #a2875f;
        padding: 3px 10px;
        border-radius: 15px;
        font-size: 0.85rem;
        margin-top: 10px;
        font-weight: 500;
    }

    /* 代码解释区域 */
    .code-explanation {
        background: #fff;
        border-radius: 10px;
        padding: 25px;
        margin-top: 40px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    }

    .code-explanation h3 {
        color: #c6aa7f;
        margin-bottom: 20px;
        padding-bottom: 10px;
        border-bottom: 2px solid #f0e6d8;
    }

    .code-block {
        background: #2d2d2d;
        color: #f8f8f2;
        padding: 15px;
        border-radius: 5px;
        font-family: 'Courier New', monospace;
        overflow-x: auto;
        margin: 15px 0;
    }

    .code-comment {
        color: #75715e;
    }

    .code-selector {
        color: #a6e22e;
    }

    .code-property {
        color: #66d9ef;
    }

    .code-value {
        color: #ae81ff;
    }

    /* ========= 移动端优化 ========= */
    @media (max-width: 768px) {
        .timeline:before {
            left: 20px;
            transform: none;
        }

        .timeline-item {
            width: 100%;
            padding-left: 50px;
            padding-right: 15px;
            text-align: left !important;
        }

        .timeline-item-left,
        .timeline-item-right {
            left: 0;
            padding-right: 15px;
            padding-left: 50px;
        }

        .timeline-item-left {
            text-align: left !important;
        }

        .timeline-badge {
            left: 20px;
            right: auto;
            transform: translateY(-50%);
        }

        /* 移动端重置圆点位置 */
        .timeline-item-left .timeline-badge,
        .timeline-item-right .timeline-badge {
            left: 20px;
            right: auto;
        }

        .year-buttons {
            gap: 10px;
        }

        .year-btn {
            padding: 8px 20px;
            font-size: 0.9rem;
        }
    }