/* ============================================
   SECS 网站 - 主样式
   基于 Bootstrap 5，配色沿用 seungem.com 工业风
   ============================================ */

:root {
    --primary: #0d6efd;          /* 科技蓝 */
    --primary-dark: #0a58ca;
    --accent: #ff6b35;           /* 品牌橙 */
    --dark: #1a1a2e;
    --gray: #6c757d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
    line-height: 1.7;
    color: #333;
}

/* 全站宽度 1500px */
.container {
    max-width: 1500px;
}

/* 固定导航: 非首页/OEM 页为白底, Hero 区透明 */
body {
    padding-top: 88px;
}
body.home-page,
body.oem-page {
    padding-top: 0;
}
.site-navbar {
    min-height: 88px;
    padding-top: 0;
    padding-bottom: 0;
    background-color: #fff;
    box-shadow: 0 .125rem .25rem rgba(0, 0, 0, .075);
    transition: background-color .3s ease, box-shadow .3s ease;
}
/* 白底导航: 菜单文字与图标用黑色 */
.navbar.site-navbar .nav-link,
.navbar.site-navbar .btn-link {
    color: #111;
}
body.home-page .site-navbar:not(.scrolled),
body.oem-page .site-navbar:not(.scrolled) {
    background-color: transparent;
    box-shadow: none;
}
body.home-page .site-navbar:not(.scrolled) .nav-link,
body.home-page .site-navbar:not(.scrolled) .navbar-brand,
body.home-page .site-navbar:not(.scrolled) .btn-link,
body.oem-page .site-navbar:not(.scrolled) .nav-link,
body.oem-page .site-navbar:not(.scrolled) .navbar-brand,
body.oem-page .site-navbar:not(.scrolled) .btn-link {
    color: #fff;
}
/* 导航透明时 Logo 变白 */
body.home-page .site-navbar:not(.scrolled) .site-logo,
body.oem-page .site-navbar:not(.scrolled) .site-logo {
    filter: brightness(0) invert(1);
}
body.home-page .site-navbar:not(.scrolled) .navbar-toggler,
body.oem-page .site-navbar:not(.scrolled) .navbar-toggler {
    border-color: rgba(255, 255, 255, .6);
}
body.home-page .site-navbar:not(.scrolled) .navbar-toggler-icon,
body.oem-page .site-navbar:not(.scrolled) .navbar-toggler-icon {
    filter: invert(1);
}

/* 导航: logo 与菜单间距增加 + 菜单项间隔 + 菜单字体加粗 */
.navbar-nav.me-auto {
    margin-left: 80px;
    gap: 2rem;
}
.navbar .nav-link {
    font-weight: 700;
    position: relative;
}
/* 当前页面所在菜单: 选中下划线 (白底导航用黑线, Hero 透明导航用白线) */
.navbar .nav-link.is-active::after {
    content: '';
    position: absolute;
    left: 1rem;
    right: 1rem;
    bottom: 2px;
    height: 2px;
    background-color: #111;
}
body.home-page .site-navbar:not(.scrolled) .nav-link.is-active::after,
body.oem-page .site-navbar:not(.scrolled) .nav-link.is-active::after {
    background-color: #fff;
}
@media (max-width: 991.98px) {
    .navbar-nav.me-auto { margin-left: 0; gap: 0; }
}

/* Hero Banner */
.hero-bg {
    background-size: cover;
    background-position: center;
    min-height: 480px;
}
.hero-overlay {
    background: linear-gradient(90deg, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.2) 100%);
    min-height: 480px;
}

/* ============================================
   Logo (后台"设置 → 站点信息"控制)
   ============================================ */
.site-logo {
    height: 25px;
    width: auto;
    object-fit: contain;
}
.footer-logo {
    max-height: 48px;
    width: auto;
    object-fit: contain;
}
@media (max-width: 768px) {
    .site-logo { height: 25px; }
    .footer-logo { max-height: 40px; }
}

/* 导航右侧图标间距 */
.navbar-nav.nav-tools {
    gap: 2rem;
}

/* 顶部下滑搜索面板 (背景色由模板按 Hero 背景色注入) */
.nav-search-overlay {
    position: fixed;
    inset: 0;
    z-index: 1080;
    pointer-events: none;
}
.nav-search-overlay.open {
    pointer-events: auto;
}
.nav-search-mask {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, .5);
    opacity: 0;
    transition: opacity .35s ease;
}
.nav-search-overlay.open .nav-search-mask {
    opacity: 1;
}
.nav-search-panel {
    position: relative;
    padding: 2.2rem 0 2.6rem;
    transform: translateY(-100%);
    transition: transform .4s cubic-bezier(.4, 0, .2, 1);
}
.nav-search-overlay.open .nav-search-panel {
    transform: translateY(0);
}
.nav-search-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: .9rem;
    border-bottom: 1px solid rgba(255, 255, 255, .5);
    color: #fff;
}
.nav-search-row i.bi-search {
    font-size: 1.15rem;
}
.nav-search-row input {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: 0;
    outline: none;
    color: #fff;
    font-size: 1.1rem;
    padding: .25rem 0;
}
.nav-search-row input::placeholder {
    color: rgba(255, 255, 255, .65);
}
.nav-search-close {
    background: transparent;
    border: 0;
    padding: 0;
    color: #fff;
    font-size: 1.15rem;
    line-height: 1;
    cursor: pointer;
}
.nav-search-links {
    margin-top: 1.9rem;
}
.nav-search-label {
    color: rgba(255, 255, 255, .5);
    font-size: .85rem;
    margin-bottom: .7rem;
}
.nav-search-links a {
    display: block;
    width: fit-content;
    color: #fff;
    font-weight: 600;
    font-size: .98rem;
    text-decoration: none;
    margin-bottom: .55rem;
}
.nav-search-links a:hover {
    color: rgba(255, 255, 255, .75);
}

/* 语言面板: 标题 + 两列语言列表 */
.lang-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.8rem;
}
/* 语言列表: 从左往右按顺序排列 (grid 行优先) */
.lang-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 260px));
    column-gap: 5rem;
    row-gap: .65rem;
}
.lang-item {
    margin: 0;
}
.lang-item button {
    background: transparent;
    border: 0;
    padding: 0 0 2px;
    color: #fff;
    font-weight: 600;
    font-size: .98rem;
    line-height: 1.6;
    cursor: pointer;
}
.lang-item button:hover {
    color: rgba(255, 255, 255, .75);
}
/* 当前语言: 白色下划线 */
.lang-item button.is-current {
    border-bottom: 1px solid #fff;
}
/* 母菜单面板里的子菜单链接 (与语言项同一套视觉) */
.lang-item a {
    display: inline-block;
    padding: 0 0 2px;
    color: #fff;
    font-weight: 600;
    font-size: .98rem;
    line-height: 1.6;
    text-decoration: none;
}
.lang-item a:hover {
    color: rgba(255, 255, 255, .75);
}
/* 当前页面所在子菜单: 白色下划线 */
.lang-item a.is-current {
    border-bottom: 1px solid #fff;
}

@media (max-width: 768px) {
    .nav-search-panel { padding: 1.4rem 0 1.6rem; }
    .lang-list { grid-template-columns: 1fr; }
}

/* ============================================
   首页全屏 Hero + 置顶区 (一行三个图文)
   ============================================ */
.home-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: stretch;
    background-color: #002e5a;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    overflow: hidden;
}

.home-hero-mask {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg, rgba(0, 6, 20, .88) 0%, rgba(0, 6, 20, .55) 45%, rgba(0, 6, 20, .18) 100%),
        linear-gradient(180deg, rgba(0, 6, 20, .45) 0%, rgba(0, 6, 20, 0) 35%, rgba(0, 6, 20, .65) 100%);
    pointer-events: none;
}

.home-hero-inner {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-height: 100vh;
    padding-top: 108px;
    padding-bottom: 48px;
    row-gap: 40px;
}

/* Hero 文案: 垂直居中于导航栏与置顶区之间, 靠右显示 */
.home-hero-copy {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    align-self: flex-end;
    text-align: right;
    max-width: 860px;
}

.home-hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: #fff;
    margin: 0 0 22px;
}

.home-hero-subtitle {
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.5;
    color: #fff;
    margin: 0 0 32px;
}

.home-hero-btn {
    display: inline-block;
    padding: 14px 34px;
    background-color: #fff;
    color: #111;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color .2s ease;
}

.home-hero-btn:hover {
    background-color: #ececec;
    color: #111;
}

.home-feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.home-feature-card {
    background: rgba(8, 14, 26, .92);
    border: 1px solid rgba(255, 255, 255, .12);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 550px;
}

.home-feature-media {
    display: block;
    flex: 0 0 auto;
}
.home-feature-media img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    display: block;
}

.home-feature-body {
    padding: 20px 22px 24px;
    flex: 1 1 auto;
    min-height: 0;           /* 允许内容收缩, 固定总高 */
    display: flex;
    flex-direction: column;
}

.home-feature-title {
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.45;
    margin-bottom: 14px;
    color: #fff;
    /* 预留 2 行标题空间, 超长截断 */
    height: calc(1.4rem * 1.45 * 2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.home-feature-title a {
    color: inherit;
    text-decoration: none;
}
.home-feature-title a:hover {
    color: #00d4ff;
}

.home-feature-summary {
    font-size: 1rem;
    line-height: 1.7;
    color: #fff;
    margin-bottom: 9px;
    /* 预留 3 行概括空间, 超长截断 */
    height: calc(1.7em * 3);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.home-feature-more {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    margin-top: auto;
    font-size: .88rem;
    font-weight: 600;
    color: #00d4ff;
    text-decoration: none;
}
.home-feature-more:hover {
    color: #66e5ff;
}

/* ---------- 支持区块 (白底, H1 黑粗体居中, 4 个 1:1 方块) ---------- */
.support-section {
    background: #fff;
    padding: 80px 0 60px;
}
.support-title {
    font-size: 3.2rem;
    font-weight: 900;
    color: #000;
    line-height: 1.2;
    margin: 0 0 48px;
    text-align: center;
}
.support-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}
.support-card {
    position: relative;
    display: block;
    aspect-ratio: 1 / 1;
    background: #fff;
    border: 1px solid #e6e6e6;
    padding: 28px 28px 32px;
    text-decoration: none;
    transition: border-color .2s ease, background-color .25s ease, color .25s ease;
}
.support-card:hover {
    background: var(--hover-bg, #002e5a);
    border-color: var(--hover-bg, #002e5a);
    color: #fff;
}
.support-card:hover .support-btn { color: #fff; }
.support-card:hover .support-btn-arrow { color: #fff; }
.support-card:hover .support-icon { filter: brightness(0) invert(1); }
.support-card:hover .support-btn-arrow { transform: translateX(3px); }
.support-icon {
    position: absolute;
    top: 24px;
    left: 24px;
    width: 40px;
    height: 40px;
    object-fit: contain;
}
.support-btn {
    position: absolute;
    left: 28px;
    bottom: 28px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: #000;
}
.support-btn-arrow {
    font-size: .95rem;
    transition: transform .2s ease;
}
.support-card:hover .support-btn-arrow {
    transform: translateX(3px);
}

@media (max-width: 1200px) {
    .support-title { font-size: 2.6rem; }
}
@media (max-width: 992px) {
    .support-section { padding: 56px 0 72px; }
    .support-title { font-size: 2rem; margin-bottom: 32px; }
    .support-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
}
@media (max-width: 576px) {
    .support-title { font-size: 1.6rem; }
}

/* ---------- Site Footer (白底, 与支持区块横线隔开, 两层) ---------- */
.site-footer {
    background: #fff;
    padding: 28px 0 24px;
    color: #333;
}
.site-footer-inner {
    display: flex;
    flex-direction: column;
    gap: 18px;
}
.site-footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}
.site-footer-logo img {
    height: 40px;
    width: auto;
    display: block;
}
.site-footer-logo-text {
    font-weight: 700;
    font-size: 1.05rem;
    color: #000;
}
.site-footer-nav {
    display: flex;
    flex-direction: row-reverse;   /* 新增菜单从右往左排布 */
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 20px 48px;
    flex: 1 1 auto;
    max-width: 980px;
    margin-left: auto;             /* 菜单整体居右 */
}
.footer-nav-col {
    display: flex;
    flex-direction: column;
    align-items: flex-end;         /* 列内文字右对齐 */
    gap: 9px;
    text-align: right;
}
.footer-nav-title,
.footer-nav-title-link {
    font-weight: 700;
    font-size: .95rem;
    color: #000;
    margin-bottom: 2px;
}
a.footer-nav-title-link {
    text-decoration: none;
}
a.footer-nav-title-link:hover {
    color: #0077ff;
}
.footer-nav-col a:not(.footer-nav-title-link) {
    color: #555;
    font-size: .88rem;
    line-height: 1.5;
    text-decoration: none;
    transition: color .15s ease;
}
.footer-nav-col a:not(.footer-nav-title-link):hover {
    color: #0077ff;
}
.site-footer-divider {
    height: 1px;
    background: #e6e6e6;
}
.site-footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.site-footer-copy {
    font-size: .85rem;
    color: #666;
}
.site-footer-divider-inline {
    margin: 0 10px;
    color: #ccc;
}
.site-footer-icp {
    color: #666;
    text-decoration: none;
    transition: color .15s ease;
}
.site-footer-icp:hover {
    color: #0077ff;
}
.site-footer-social {
    display: flex;
    gap: 18px;
    font-size: 1.2rem;
}
.site-footer-social a {
    color: #333;
    text-decoration: none;
    transition: color .15s ease, transform .15s ease;
    line-height: 1;
}
.site-footer-social a:hover {
    color: #0077ff;
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .site-footer-top, .site-footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
    .site-footer-nav {
        width: 100%;
        flex-direction: column;    /* 移动端恢复竖排 */
        gap: 18px;
        margin-left: 0;
    }
    .footer-nav-col {
        align-items: flex-start;
        text-align: left;
    }
}

@media (max-width: 992px) {
    .home-hero {
        min-height: auto;
    }
    .home-hero-inner {
        min-height: auto;
        padding-top: 110px;
        padding-bottom: 40px;
        row-gap: 28px;
    }
    .home-hero-copy {
        flex: 0 0 auto;
    }
    .home-hero-title {
        font-size: 2.2rem;
        margin-bottom: 16px;
    }
    .home-hero-subtitle {
        font-size: 1.05rem;
        margin-bottom: 24px;
    }
    .home-feature-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

/* 卡片悬浮效果 */
.article-card:hover,
.product-card:hover {
    transform: translateY(-4px);
    transition: transform 0.3s ease;
}

/* 富文本内容区 */
/* ---------- 文章详情页 ---------- */
article header h1 { font-weight: 900; }

.content-body h1, .content-body h2, .content-body h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}
.content-body p { margin-bottom: 1rem; }
.content-body img { max-width: 100%; height: auto; }
.content-body ul, .content-body ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.content-body blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    color: var(--gray);
    font-style: italic;
}

/* 响应式微调 */
@media (max-width: 768px) {
    .hero-bg, .hero-overlay { min-height: 320px; }
    .display-4 { font-size: 2rem; }
}

/* ============================================
   合作伙伴 (经销商) 列表页 (左侧窄栏筛选 + 右侧宽栏卡片)
   ============================================ */
.partner-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 3fr);
    gap: 40px;
    align-items: start;
}
.partner-main {
    min-width: 0;
}

/* 卡片网格: 固定宽高, 一行三个 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}
@media (max-width: 1199.98px) {
    .partner-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 991.98px) {
    .partner-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 28px;
    }
}
@media (max-width: 575.98px) {
    .partner-grid { grid-template-columns: 1fr; }
}

.partner-card {
    position: relative;
    display: flex;
    flex-direction: column;
    height: 470px;
    padding: 42px 22px 22px;
    background: #fff;
    border: 1px solid #e9ecf0;
}

/* 左上角类型标签 */
.partner-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 12px;
    background: #eef4fb;
    color: #002e5a;
    font-size: .78rem;
    font-weight: 600;
    line-height: 1.5;
    letter-spacing: .02em;
}

/* Logo: 16:9 区域 */
.partner-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 16 / 9;
    max-height: 190px;
    margin-bottom: 16px;
    overflow: hidden;
}
.partner-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.partner-name {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.45;
    color: #002e5a;
    margin: 0 0 8px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.partner-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 10px;
    margin: 0 0 10px;
    font-size: .82rem;
    line-height: 1.6;
    color: #6b7480;
    max-height: 3.2em;
    overflow: hidden;
}
.partner-meta i {
    color: #002e5a;
    margin-right: 4px;
}

/* 简介: 固定 3 行, 超出省略 */
.partner-intro {
    flex: 1 1 auto;
    margin: 0 0 12px;
    font-size: .86rem;
    line-height: 1.65;
    color: #4a545e;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.partner-contact {
    margin: 0;
    padding-top: 10px;
    border-top: 1px solid #f0f2f5;
    font-size: .98rem;
    line-height: 1.5;
    color: #002e5a;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.partner-contact i {
    margin-right: 6px;
}

.partner-empty {
    grid-column: 1 / -1;
    padding: 70px 0;
    text-align: center;
    color: #8a939e;
    font-size: .95rem;
}

/* ============================================
   OEM / ODM 定制页
   ============================================ */
.oem-hero {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 100vh;
    background-color: #002e5a;
    color: #fff;
    overflow: hidden;
}
.oem-hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}
.oem-hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.oem-hero-mask {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        linear-gradient(90deg, rgba(0, 6, 20, .9) 0%, rgba(0, 6, 20, .6) 45%, rgba(0, 6, 20, .2) 100%),
        linear-gradient(180deg, rgba(0, 6, 20, .5) 0%, rgba(0, 6, 20, 0) 30%, rgba(0, 6, 20, .55) 100%);
    pointer-events: none;
}
.oem-hero-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1500px;
    padding-top: 88px;
    text-align: center;
}
.oem-hero-title {
    width: 100%;
    margin: 0 auto 24px;
    font-size: 3.8rem;
    font-weight: 900;
    line-height: 1.2;
}
.oem-hero-subtitle {
    width: 100%;
    margin: 0 auto;
    font-size: 1.35rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, .82);
}

@media (max-width: 991.98px) {
    .oem-hero-title {
        font-size: 2.5rem;
    }
    .oem-hero-subtitle {
        font-size: 1.15rem;
    }
}

/* ============================================
   关于我们 (参照官方网站传统版 about 结构)
   ============================================ */
.about-page {
    padding: 56px 0 80px;
}

.about-banner {
    margin-bottom: 40px;
}
.about-banner img {
    width: 100%;
    display: block;
}

.about-intro p {
    margin: 0 0 14px;
    text-indent: 2em;
    color: #333;
    line-height: 1.9;
}

.about-video {
    margin: 32px 0 8px;
}
.about-video video {
    width: 100%;
    display: block;
    background: #000;
}

.about-columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
    margin-top: 40px;
    align-items: start;
}
.about-lead {
    margin: 0 0 18px;
    font-size: 1.3rem;
    font-weight: 700;
    color: #002e5a;
}
.about-text {
    margin: 0 0 14px;
    text-indent: 2em;
    color: #333;
    line-height: 1.9;
}

.about-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 28px;
    padding: 22px 26px;
    background: #002e5a;
    color: #fff;
}
.about-card h5 {
    margin: 0 0 6px;
    font-size: 1.05rem;
    font-weight: 700;
    color: #fff;
}
.about-card p {
    margin: 0;
    font-size: .86rem;
    color: rgba(255, 255, 255, .75);
}
.about-card-btn {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    background: #fff;
    color: #111;
    font-size: .9rem;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color .2s ease;
}
.about-card-btn:hover {
    background: #ececec;
    color: #111;
}

.about-item {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}
.about-item-num {
    flex: 0 0 auto;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #002e5a;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .95rem;
    font-weight: 700;
    line-height: 1;
}
.about-item-body h4 {
    margin: 0 0 10px;
    font-size: 1.15rem;
    font-weight: 700;
    color: #111;
}
.about-item-body p {
    margin: 0 0 10px;
    color: #444;
    line-height: 1.8;
}

@media (max-width: 991.98px) {
    .about-columns {
        grid-template-columns: minmax(0, 1fr);
        gap: 36px;
    }
}

/* ============================================
   文档中心 (左侧窄栏搜索+多层筛选, 右侧宽栏列表)
   ============================================ */
.doc-page {
    padding: 56px 0 80px;
}
.doc-page-title {
    margin: 0 0 32px;
    font-size: 2.6rem;
    font-weight: 900;
    line-height: 1.2;
    color: #002e5a;
}

.doc-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 3fr);
    gap: 40px;
    align-items: start;
}

/* ---------- 左侧功能区 ---------- */
.doc-sidebar {
    position: sticky;
    top: 108px;
}
.doc-filter {
    background: #f5f7fa;
    border: 1px solid #e6eaef;
    padding: 22px 20px 24px;
}
.doc-search {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    height: 44px;
    background: #fff;
    border: 1px solid #dfe3e8;
}
.doc-search i {
    color: #8a939e;
    font-size: 1rem;
}
.doc-search input {
    flex: 1;
    min-width: 0;
    height: 100%;
    border: 0;
    outline: none;
    background: transparent;
    font-size: .95rem;
    color: #222;
}
.doc-search input::placeholder {
    color: #a6adb6;
}

.doc-filter-head {
    margin: 26px 0 12px;
    font-size: .95rem;
    font-weight: 700;
    color: #002e5a;
}

.doc-filter-tree {
    max-height: 56vh;
    overflow-y: auto;
    padding-right: 4px;
}
.doc-cat-node {
    margin-bottom: 2px;
}
.doc-cat-row {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 7px 4px;
    cursor: pointer;
    font-size: .93rem;
    line-height: 1.5;
    color: #333;
}
.doc-cat-row:hover {
    background: #eceff4;
}
.doc-cat-row input {
    flex: 0 0 auto;
    width: 15px;
    height: 15px;
    margin: 0;
    accent-color: #002e5a;
    cursor: pointer;
}
.doc-cat-children {
    margin-left: 11px;
    padding-left: 12px;
    border-left: 1px solid #dde2e8;
}

.doc-filter-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 22px;
}
.doc-apply {
    border: 0;
    padding: 10px 24px;
    background: #002e5a;
    color: #fff;
    font-size: .9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color .2s ease;
}
.doc-apply:hover {
    background: #004580;
}
.doc-reset {
    font-size: .88rem;
    color: #6c757d;
    text-decoration: none;
}
.doc-reset:hover {
    color: #002e5a;
    text-decoration: underline;
}

/* ---------- 右侧文档列表 ---------- */
.doc-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 18px 20px;
    margin-bottom: 14px;
    background: #fff;
    border: 1px solid #e6eaef;
}
.doc-item-thumb {
    flex: 0 0 auto;
    width: 96px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f2f5f9;
    border: 1px solid #e6eaef;
    color: #002e5a;
    font-size: 2rem;
    overflow: hidden;
}
.doc-item-thumb.is-image {
    display: block;
    padding: 0;
}
.doc-item-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.doc-item-body {
    flex: 1 1 auto;
    min-width: 0;
}
.doc-item-title {
    margin: 0 0 6px;
    font-size: 1.08rem;
    font-weight: 700;
    line-height: 1.5;
    color: #1f2a36;
}
.doc-item-meta {
    margin: 0 0 6px;
    font-size: .8rem;
    line-height: 1.5;
    color: #8a939e;
}
.doc-item-desc {
    margin: 0;
    font-size: .88rem;
    line-height: 1.65;
    color: #5b6672;
}
.doc-item-actions {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 104px;
}
.doc-btn {
    display: block;
    width: 100%;
    padding: 8px 0;
    text-align: center;
    font-size: .85rem;
    font-weight: 600;
    line-height: 1.4;
    text-decoration: none;
    border: 1px solid #002e5a;
    color: #002e5a;
    background: #fff;
    cursor: pointer;
    transition: background-color .2s ease, color .2s ease;
}
.doc-btn-preview:hover {
    background: #002e5a;
    color: #fff;
}
.doc-btn-download {
    background: #002e5a;
    color: #fff;
}
.doc-btn-download:hover {
    background: #004580;
    color: #fff;
}

.doc-empty {
    padding: 80px 0;
    text-align: center;
    color: #8a939e;
    font-size: .95rem;
    border: 1px dashed #dfe3e8;
}

/* ---------- 预览弹窗 ---------- */
.doc-preview-modal .modal-header {
    align-items: center;
    gap: 16px;
}
.doc-preview-modal .modal-title {
    flex: 1 1 auto;
    min-width: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: #002e5a;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.doc-preview-tools {
    display: flex;
    align-items: center;
    gap: 14px;
}
.doc-preview-tools .doc-btn {
    width: auto;
    padding: 6px 16px;
}
.doc-preview-modal .modal-body {
    padding: 0;
    background: #eef1f5;
}
.doc-preview-img {
    display: block;
    max-width: 100%;
    max-height: 76vh;
    margin: 0 auto;
}
.doc-preview-frame {
    display: block;
    width: 100%;
    height: 76vh;
    border: 0;
}
.doc-preview-tip {
    margin: 0;
    padding: 70px 30px;
    text-align: center;
    color: #5b6672;
    font-size: .95rem;
}

@media (max-width: 991.98px) {
    .doc-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 28px;
    }
    .doc-sidebar {
        position: static;
    }
    .doc-filter-tree {
        max-height: none;
    }
    .doc-page-title {
        font-size: 2rem;
    }
    .doc-item {
        flex-wrap: wrap;
    }
    .doc-item-actions {
        flex-direction: row;
        width: 100%;
    }
    .doc-item-actions .doc-btn {
        flex: 1 1 0;
    }
}

/* ============================================
   发展历程 (参照官方网站传统版 history.html)
   ============================================ */
.history-row {
    margin-bottom: 40px;
}
.history-row hr {
    border: 0;
    border-top: 1px solid #e3e7ec;
    margin: 0 0 26px;
}
.history-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
}
.history-year {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    border: 2px solid #002e5a;
    color: #002e5a;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: .5px;
    margin-bottom: 20px;
}
.history-card {
    background: #f7f8fa;
    border: 1px solid #eceff3;
    padding: 20px 24px;
    min-height: 130px;
}
.history-list {
    margin: 0;
    padding-left: 18px;
}
.history-list li {
    margin-bottom: 10px;
    color: #333;
    font-size: .95rem;
    line-height: 1.7;
}
.history-list li:last-child {
    margin-bottom: 0;
}

@media (max-width: 991.98px) {
    .history-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
@media (max-width: 575.98px) {
    .history-grid {
        grid-template-columns: minmax(0, 1fr);
    }
    .history-year {
        width: 74px;
        height: 74px;
        font-size: 1.15rem;
    }
}