/* -------- 页面头部 (居中) -------- */
.page-header {
    background: linear-gradient(145deg, #f0f4fa 0%, #e6edf6 100%);
    padding: 3.5rem 0 3rem;
    border-bottom: 1px solid rgba(0, 106, 205, 0.08);
}
.page-header h1 {
    font-weight: 700;
    color: #0b1a33;
    font-size: 2.4rem;
    letter-spacing: -0.5px;
}
.page-header h1 i {
    color: #006ACD;
    margin-right: 8px;
}
.page-header .lead {
    color: #4b5a6a;
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto;
}
.page-header .breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}
.page-header .breadcrumb-item a {
    color: #006ACD;
    text-decoration: none;
}
.page-header .breadcrumb-item.active {
    color: #4b5a6a;
}

/* -------- 里程碑主时间线 -------- */
.milestone-main {
    padding: 3.5rem 0 4.5rem;
}
.timeline-wrapper {
    max-width: 920px;
    margin: 0 auto;
    position: relative;
    padding: 0 20px;
}
/* 中央竖线 */
.timeline-wrapper::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, #dde2eb 0%, #b0c4de 50%, #dde2eb 100%);
    transform: translateX(-50%);
    border-radius: 4px;
}

.milestone-block {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2.8rem;
    position: relative;
}
/* 交替左右布局 */
.milestone-block:nth-child(odd) {
    flex-direction: row;
}
.milestone-block:nth-child(even) {
    flex-direction: row-reverse;
}

.milestone-block .milestone-content-wrap {
    width: calc(50% - 40px);
    background: #ffffff;
    border-radius: 1.2rem;
    padding: 1.6rem 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.03);
    position: relative;
}
.milestone-block .milestone-content-wrap:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 106, 205, 0.08);
    border-color: rgba(0, 106, 205, 0.12);
}

/* 左侧内容：右对齐文字 */
.milestone-block:nth-child(odd) .milestone-content-wrap {
    text-align: right;
    margin-right: 40px;
}
/* 右侧内容：左对齐文字 */
.milestone-block:nth-child(even) .milestone-content-wrap {
    text-align: left;
    margin-left: 40px;
}

.milestone-block .milestone-dot-wrap {
    position: absolute;
    left: 50%;
    top: 1.8rem;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.milestone-block .milestone-dot {
    display: block;
    width: 22px;
    height: 22px;
    background: #006ACD;
    border-radius: 50%;
    border: 4px solid #ffffff;
    box-shadow: 0 0 0 4px #006ACD, 0 6px 20px rgba(0, 106, 205, 0.30);
    transition: 0.3s;
    flex-shrink: 0;
}
.milestone-block:hover .milestone-dot {
    transform: scale(1.18);
    box-shadow: 0 0 0 5px #006ACD, 0 8px 30px rgba(0, 106, 205, 0.40);
}
.milestone-block .milestone-date-badge {
    margin-top: 8px;
    background: rgba(0, 106, 205, 0.10);
    color: #006ACD;
    font-weight: 600;
    font-size: 0.75rem;
    padding: 0.2rem 0.9rem;
    border-radius: 20px;
    border: 1px solid rgba(0, 106, 205, 0.12);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.milestone-block .milestone-tag {
    display: inline-block;
    background: rgba(0, 106, 205, 0.08);
    color: #006ACD;
    font-weight: 600;
    font-size: 0.8rem;
    padding: 0.2rem 1.2rem;
    border-radius: 20px;
    letter-spacing: 0.4px;
    border: 1px solid rgba(0, 106, 205, 0.10);
    margin-bottom: 0.6rem;
}
.milestone-block .milestone-title {
    font-weight: 700;
    font-size: 1.25rem;
    color: #0b1a33;
    margin-bottom: 0.4rem;
    line-height: 1.4;
}
.milestone-block .milestone-desc {
    color: #6c7a8a;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0.2rem;
}
.milestone-block .milestone-desc .highlight {
    color: #006ACD;
    font-weight: 500;
}

/* 奇数项（左侧）内容右对齐时，调整标签和标题右对齐 */
.milestone-block:nth-child(odd) .milestone-content-wrap .milestone-tag {
    float: right;
}
.milestone-block:nth-child(odd) .milestone-content-wrap .milestone-title {
    clear: both;
}
.milestone-block:nth-child(even) .milestone-content-wrap .milestone-tag {
    float: left;
}
.milestone-block:nth-child(even) .milestone-content-wrap .milestone-title {
    clear: both;
}

/* 小屏适配 */
@media (max-width: 767.98px) {
    .page-header {
        padding: 2.5rem 0 2rem;
    }
    .page-header h1 {
        font-size: 1.8rem;
    }
    .page-header .lead {
        font-size: 1rem;
    }

    .timeline-wrapper::before {
        left: 24px;
    }
    .milestone-block {
        flex-direction: column !important;
        align-items: flex-start;
        padding-left: 50px;
        margin-bottom: 2.2rem;
    }
    .milestone-block .milestone-content-wrap {
        width: 100% !important;
        margin: 0 !important;
        text-align: left !important;
        padding: 1.2rem 1.4rem;
    }
    .milestone-block .milestone-dot-wrap {
        left: 24px;
        top: 0.6rem;
        transform: translateX(-50%);
        flex-direction: row;
        gap: 10px;
        align-items: center;
    }
    .milestone-block .milestone-dot {
        width: 18px;
        height: 18px;
        border-width: 3px;
        box-shadow: 0 0 0 3px #006ACD, 0 4px 14px rgba(0, 106, 205, 0.25);
    }
    .milestone-block .milestone-date-badge {
        margin-top: 0;
        font-size: 0.7rem;
        padding: 0.15rem 0.8rem;
    }
    .milestone-block .milestone-content-wrap .milestone-tag {
        float: none !important;
        display: inline-block;
    }
    .milestone-block .milestone-content-wrap .milestone-title {
        clear: none;
    }
    .milestone-block:nth-child(odd) .milestone-content-wrap {
        text-align: left !important;
    }
    .milestone-main {
        padding: 2rem 0 3rem;
    }
}
@media (max-width: 575.98px) {
    .milestone-block {
        padding-left: 40px;
    }
    .timeline-wrapper::before {
        left: 18px;
    }
    .milestone-block .milestone-dot-wrap {
        left: 18px;
    }
    .milestone-block .milestone-content-wrap {
        padding: 1rem 1.2rem;
    }
    .milestone-block .milestone-title {
        font-size: 1.1rem;
    }
    .milestone-block .milestone-desc {
        font-size: 0.9rem;
    }
}