.timeline-component {
    padding: 20px 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 头部 */
.timeline-header {
    text-align: center;
    margin-bottom: 50px;
}

.timeline-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 10px;
}

.timeline-subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 0;
}

/* =====================
   竖向布局
   ===================== */
.timeline-vertical {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline-line-v {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--border-primary), var(--theme-color), var(--border-primary));
    transform: translateX(-50%);
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 竖向 - 左侧项目 */
.timeline-vertical .timeline-item.item-left {
    width: 50%;
    padding-right: 60px;
    text-align: right;
}

.timeline-vertical .timeline-item.item-left .timeline-dot {
    right: -25px;
}

.timeline-vertical .timeline-item.item-left .timeline-card {
    text-align: left;
}

/* 竖向 - 右侧项目 */
.timeline-vertical .timeline-item.item-right {
    width: 50%;
    margin-left: 50%;
    padding-left: 60px;
    text-align: left;
}

.timeline-vertical .timeline-item.item-right .timeline-dot {
    left: -25px;
}

/* 时间点圆点 */
.timeline-dot {
    position: absolute;
    top: 20px;
    width: 50px;
    height: 50px;
    background: var(--bg-card);
    border: 3px solid var(--theme-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    transition: all 0.3s ease;
    color: var(--theme-color);
}

.timeline-dot:hover {
    transform: scale(1.15);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);
}

/* 图标统一样式 */
.timeline-dot svg,
.timeline-dot .icon-apps,
.timeline-dot [class*="icon-"] {
    width: 22px !important;
    height: 22px !important;
    color: currentColor;
    fill: currentColor;
    stroke: currentColor;
}

/* 卡片 */
.timeline-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 20px 24px;
    transition: all 0.3s ease;
}

.timeline-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--theme-color);
}

.timeline-year {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    background: var(--theme-color);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 10px;
}

.timeline-item-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 8px;
}

.timeline-item-content {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-content);
    margin: 0;
}

/* =====================
   横向布局
   ===================== */
.timeline-horizontal {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    position: relative;
    padding: 40px 20px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.timeline-line-h {
    position: absolute;
    top: 55px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--border-primary), var(--theme-color), var(--border-primary));
    border-radius: 3px;
}

.timeline-item-h {
    flex: 1;
    min-width: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 0 10px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-item-h.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item-h .timeline-dot {
    position: relative;
    top: 0;
    left: auto;
    right: auto;
    margin-bottom: 20px;
}

.timeline-item-h .timeline-card {
    text-align: center;
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 16px 12px;
    transition: all 0.3s ease;
}

.timeline-item-h .timeline-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--theme-color);
}

.timeline-item-h .timeline-year {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: #fff;
    background: var(--theme-color);
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 8px;
}

.timeline-item-h .timeline-item-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 6px;
}

.timeline-item-h .timeline-item-content {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-content);
    margin: 0;
}

/* 连接线箭头（横向） */
.timeline-item-h:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 55px;
    right: -10px;
    width: 0;
    height: 0;
    border-left: 8px solid var(--theme-color);
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    z-index: 1;
}

/* =====================
   响应式
   ===================== */
@media (max-width: 768px) {
    .timeline-header {
        margin-bottom: 40px;
    }

    .timeline-title {
        font-size: 22px;
    }

    /* 竖向布局 - 移动端单列 */
    .timeline-vertical .timeline-line-v {
        left: 20px;
    }

    .timeline-vertical .timeline-item.item-left,
    .timeline-vertical .timeline-item.item-right {
        width: 100%;
        margin-left: 0;
        padding-left: 60px;
        padding-right: 20px;
        text-align: left;
    }

    .timeline-vertical .timeline-item.item-left .timeline-dot,
    .timeline-vertical .timeline-item.item-right .timeline-dot {
        left: -5px;
        right: auto;
    }

    .timeline-vertical .timeline-item.item-left .timeline-card,
    .timeline-vertical .timeline-item.item-right .timeline-card {
        text-align: left;
    }

    /* 横向布局 - 移动端可滚动 */
    .timeline-horizontal {
        padding: 40px 10px;
    }

    .timeline-item-h {
        min-width: 120px;
        padding: 0 5px;
    }

    .timeline-item-h .timeline-dot {
        width: 40px;
        height: 40px;
    }

    .timeline-item-h .timeline-dot svg,
    .timeline-item-h .timeline-dot [class*="icon-"] {
        width: 18px !important;
        height: 18px !important;
    }

    .timeline-item-h .timeline-card {
        padding: 12px 8px;
    }

    .timeline-item-h .timeline-item-title {
        font-size: 14px;
    }

    .timeline-item-h .timeline-item-content {
        font-size: 12px;
    }
}