/**
 * 关于我们页面样式
 * 
 * 包含公司介绍、愿景使命、发展历程等样式
 */

/* ========== Banner背景 ========== */
.page-banner.about-banner {
    position: relative;
    overflow: hidden;
    padding: 0;
    min-height: 340px;
    display: flex;
    align-items: center;
    text-align: left;
    background: #dfe3e6 url('/static/images/banner02.png') center center / cover no-repeat;
}

.about-banner .container {
    position: relative;
    z-index: 1;
}

.about-banner-title {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.35;
    margin: 0;
    text-shadow: 0 1px 3px rgba(255, 255, 255, 0.4);
}

/* ========== 通用中英标题（中英文上下排列） ========== */
.sec-title {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.sec-title.text-center {
    align-items: center;
    text-align: center;
}

.sec-title-en {
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: 2px;
    color: #d0d0d0;
    text-transform: uppercase;
}

.sec-title-light {
    color: white;
}

.sec-title-light .sec-title-en {
    color: rgba(255, 255, 255, 0.5);
}

/* ========== 锚点导航（吸顶） ========== */
.about-anchor-nav {
    background: #f5f6f8;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}

.about-anchor-nav ul {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.about-anchor-nav a {
    display: block;
    padding: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.about-anchor-nav a:hover,
.about-anchor-nav a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* ========== 企业介绍 ========== */
.company-intro {
    background: white;
}

.intro-content {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
}

.intro-text {
    flex: 1;
    min-width: 0;
}

.intro-text p {
    line-height: 2;
    color: var(--text-secondary);
    text-align: justify;
}

.intro-image {
    flex: none;
    width: 38%;
    max-width: 380px;
    opacity: 0.5;
}

.intro-image img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
}

/* ========== 愿景使命 ========== */
.vision-mission {
    background: #eef0f3 url('/static/images/bg02.png') center center / cover no-repeat;
}

.vm-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.vm-item {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

/* 图标：常态 / 悬停双图叠加切换 */
.vm-icon {
    position: relative;
    width: 54px;
    height: 54px;
    margin: 0 auto var(--spacing-md);
}

.vm-icon-normal,
.vm-icon-sel {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: opacity var(--transition-fast);
}

.vm-icon-sel {
    opacity: 0;
}

.vm-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    white-space: pre-line;
}

.vm-desc {
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--text-light);
}

/* 悬停卡片（白底红字，带阴影，展示悬停图标）—— 无默认选中态 */
.vm-item:hover {
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transform: translateY(-10px);
}

.vm-item:hover .vm-icon-normal {
    opacity: 0;
}

.vm-item:hover .vm-icon-sel {
    opacity: 1;
}

.vm-item:hover .vm-title {
    color: var(--primary-color);
}

/* ========== 大事记（通屏曲线时间轴，line01.png 为轴） ========== */
.milestone-section {
    background: white;
    overflow: hidden;
}

/* 轴容器：通屏铺满视口宽度，曲线背景图按原比例（2017x165）随宽度等比缩放，
   上下留白用于容纳溢出轴区的年份牌与事件文字 */
/* 曲线画布固定 1920px 宽居中（超出部分被 section 裁掉），
   360~1560px 区间对应居中的 1200px 内容区，背景图按原比例平铺 */
.milestone-track {
    position: relative;
    width: 1920px;
    left: 50%;
    margin-left: -960px;
    height: 157px;
    margin-top: 150px;
    margin-bottom: 150px;
    background: url('/static/images/line01.png') left top / 1920px 157px no-repeat;
}

/* 节点悬停轻微放大 */
.milestone-dot {
    transition: transform var(--transition-normal);
}

.milestone-node:hover .milestone-dot {
    transform: scale(1.35);
}

.milestone-box {
    transition: transform var(--transition-normal);
}

.milestone-node:hover .milestone-box {
    transform: translateX(-50%) scale(1.05);
}

/* 单个节点：绝对定位到曲线上圆点的位置 */
.milestone-node {
    position: absolute;
    transform: translate(-50%, -50%);
    z-index: 1;
}

/* 红边圆点（盖住背景图上的空心圆点） */
.milestone-dot {
    position: absolute;
    top: 0;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    z-index: 3;
}

/* 连接线：圆点到年份牌之间的竖线 */
.milestone-stem {
    position: absolute;
    left: 50%;
    width: 1px;
    height: 46px;
    margin-left: -0.5px;
    background: var(--primary-color);
    z-index: 1;
}

.milestone-top .milestone-stem {
    bottom: 0;
}

.milestone-bottom .milestone-stem {
    top: 0;
}

/* 文字盒子：年份徽标 + 事件说明 */
.milestone-box {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 110px;
    z-index: 2;
}

/* 年份红色徽标 */
.milestone-year {
    background: var(--primary-color);
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    line-height: 1;
    padding: 7px 14px;
    border-radius: 2px;
    white-space: nowrap;
}

.milestone-event {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
    white-space: pre-line;
}

/* 上方节点：文字盒子在圆点之上（事件在上，年份在下贴近连线） */
.milestone-top .milestone-box {
    bottom: 46px;
}

.milestone-top .milestone-event {
    order: 1;
    margin-bottom: 10px;
}

.milestone-top .milestone-year {
    order: 2;
}

/* 下方节点：文字盒子在圆点之下（年份在上贴近连线，事件在下） */
.milestone-bottom .milestone-box {
    top: 46px;
}

.milestone-bottom .milestone-year {
    order: 1;
    margin-bottom: 10px;
}

.milestone-bottom .milestone-event {
    order: 2;
}

/* ========== 合作客户（2 行 x 4 列网格） ========== */
.partners-section {
    background: #1a2233 url('/static/images/bg03.png') center center / cover no-repeat;
    position: relative;
}

.partners-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(20, 28, 45, 0.85);
}

.partners-section .container {
    position: relative;
    z-index: 1;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 280px);
    justify-content: center;
    gap: 24px;
}

.partner-item {
    width: 280px;
    height: 120px;
    border: 1px solid #D8D8D8;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.partner-item img {
    max-width: 82%;
    max-height: 72%;
    object-fit: contain;
    transition: transform var(--transition-normal);
}

.partner-item:hover img {
    transform: scale(1.08);
}

/* ========== 联系我们 ========== */
.contact-section {
    background: white;
}

.contact-map {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.contact-map img {
    display: block;
    width: 100%;
    height: auto;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    line-height: 1.2;
}

.contact-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.contact-value {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .about-anchor-nav ul {
        gap: var(--spacing-md);
        overflow-x: auto;
        justify-content: flex-start;
    }
    
    .about-anchor-nav a {
        white-space: nowrap;
        font-size: 0.9375rem;
    }
    
    .sec-title {
        flex-direction: column;
        gap: var(--spacing-xs);
        align-items: center;
        text-align: center;
    }
    
    .intro-content {
        flex-direction: column;
    }
    
    .intro-image {
        width: 100%;
        max-width: 100%;
        order: -1;
    }
    
    .vm-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .vm-item:hover {
        transform: none;
    }
    
    /* 大事记移动端：放弃曲线图，改为纵向列表 */
    .milestone-track {
        width: auto;
        left: auto;
        margin: 0 0 var(--spacing-lg);
        height: auto;
        background: none;
        padding-left: var(--spacing-lg);
        border-left: 2px solid var(--primary-color);
    }
    
    .milestone-stem {
        display: none;
    }
    
    .milestone-node {
        position: static;
        transform: none;
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }
    
    .milestone-dot {
        position: static;
        margin: 0 0 0 -21px;
        flex: none;
    }
    
    .milestone-box {
        position: static;
        transform: none;
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-sm);
        width: auto;
        text-align: left;
    }
    
    .milestone-top .milestone-box,
    .milestone-bottom .milestone-box {
        top: auto;
        bottom: auto;
    }
    
    .milestone-top .milestone-event,
    .milestone-bottom .milestone-event,
    .milestone-top .milestone-year,
    .milestone-bottom .milestone-year {
        order: initial;
        margin: 0;
    }
    
    .contact-info {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-lg);
    }

    /* 合作伙伴移动端两列 */
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .partner-item {
        width: 100%;
    }
}