/* ========== Banner ========== */
.searchMain{position:relative;width:100%;height:350px;padding-top:130px;box-sizing:border-box;overflow:hidden}
.searchMain-video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;object-position:50% 100%;z-index:0}
.searchMain-mask{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.28);z-index:1}
.searchMain .Tit,.searchMain .city_box{position:relative;z-index:2}
.Tit{font-weight:600;font-size:36px;color:#FFF;text-align:center;margin-bottom:8px}
.city_box{width:600px;background:#fff;margin:30px auto 0;border-radius:4px;height:60px;box-shadow:0 5px 20px 0 rgba(0,0,0,.05);border:1px solid #F3F3F3;position:relative;box-sizing:border-box;display:flex;align-items:center;padding:0 10px 0 16px}
.search_icon{width:20px;height:20px;flex-shrink:0;margin-right:12px}
.city_box .input{flex:1;height:24px;line-height:24px;color:#1A1B1F;background:none;border:none;font-size:14px;outline:none;padding:0}
.city_box .input::placeholder{color:#999}
.city_box .button{display:none;border-radius:2px;background:#000;height:40px;width:88px;line-height:40px;font-size:14px;border:none;color:#FFF;text-align:center;cursor:pointer;flex-shrink:0;margin-left:17px}
.city_box .button.show{display:block}
.searchMain .title{font-size:26px;text-align:center;font-weight:normal;padding-bottom:10px;letter-spacing:10px}
.searchMain .search-result{margin-top:80px;font-weight:600;font-size:30px;color:#000;text-align:center}
.clean{display:none;width:16px;height:16px;cursor:pointer;flex-shrink:0}
.clean.show{display:block}
.box{width:1170px;margin:0 auto}

/* ========== 主内容区 ========== */
.help-main{background:#FFF;padding:50px 0 80px;min-height:500px}
.help-container{display:flex;align-items:flex-start;gap:30px}

/* ========== 左侧导航（三级手风琴） ========== */
/* 导航自然高度未超出视口时，由 JS 加 is-sticky 固定在左侧；
   超出时不加，回归文档流随页面一起滚动 */
.sidebar-sticky-wrapper{position:relative;width:235px;flex-shrink:0;align-self:flex-start;z-index:9}
.sidebar-sticky-wrapper.is-sticky{position:sticky;top:100px}
.help-sidebar{width:100%;background:#FFF;padding:20px 0;box-sizing:border-box}
.sidebar-title{font-size:16px;font-weight:600;color:#1A1B1F;padding:0 24px 18px;border-bottom:1px solid #F0F0F0;margin-bottom:6px}

/* 导航列表通用 */
.nav-list{
    border-top: 1px solid #E5E5E5;
}
.nav-list,.nav-children{list-style:none;margin:0;padding:0}
.nav-item{position:relative}

/* 一级导航 */
.nav-link-level1,
.nav-title-level1{display:flex;align-items:center;min-height:60px;box-sizing: border-box; padding:14px 24px 14px 0;font-size:14px;color:#666;text-decoration:none;cursor:pointer;transition:color .2s,background .2s;position:relative}
.nav-link-level1:hover,.nav-title-level1:hover{color:#121212;font-weight: 600;}
.nav-link-level1.active,.nav-title-level1.active{color:#1A1B1F;font-weight:600}

/* 二级导航 */
.nav-title-level2,
.nav-link-level2{display:flex;align-items:center;min-height:57px;box-sizing: border-box;padding:12px 24px 12px 36px;font-size:13px;color:#777;text-decoration:none;cursor:pointer;transition:color .2s,background .2s;position:relative}
.nav-title-level2:hover,.nav-link-level2:hover{color:#121212;font-weight: 600;}
.nav-title-level2.active,.nav-link-level2.active{color:#121212;font-weight:500}

/* 三级导航 */
.nav-title-level3,
.nav-link-level3{display:flex;align-items:center;min-height:57px;box-sizing: border-box;padding:10px 24px 10px 56px;font-size:13px;color:#888;text-decoration:none;transition:color .2s,background .2s;cursor:pointer;position:relative}
.nav-title-level3:hover,.nav-link-level3:hover{color:#121212;font-weight: 600;}
.nav-title-level3.active,.nav-link-level3.active{color:#121212;font-weight:500;}
.nav-link-text{flex:1}

/* 四级导航（系列） */
.nav-title-level4,.nav-link-level4{display:flex;align-items:center;min-height:57px;box-sizing: border-box;padding:9px 24px 9px 72px;font-size:13px;color:#888;text-decoration:none;transition:color .2s,background .2s;cursor:pointer;position:relative}
.nav-title-level4:hover,.nav-link-level4:hover{color:#121212;font-weight: 600;}
.nav-title-level4.active,.nav-link-level4.active{color:#121212;font-weight:500;}

/* 五级导航（产品） */
.nav-link-level5{display:flex;align-items:center;min-height:57px;box-sizing: border-box;padding:8px 24px 8px 88px;font-size:12px;color:#999;text-decoration:none;transition:color .2s,background .2s}
.nav-link-level5:hover{color:#121212;font-weight: 600;}
.nav-link-level5.active{color:#121212;font-weight:500;}

/* 可展开项的箭头：默认隐藏，只有 has-children 才展示，使用图片素材 */
.nav-arrow{display:none;position:absolute;right:2px;top:50%;transform:translateY(-50%) rotate(0deg);width:18px;height:18px;background:url(https://hsimage.fotile.com/202608051307116896235.png) no-repeat center/100% 100%;transition:transform .3s ease}
.nav-item.has-children>.nav-title .nav-arrow{display:block;transform:translateY(-50%) rotate(0deg)}

/* 展开状态 */
.nav-item.has-children.open>.nav-title .nav-arrow{transform:translateY(-50%) rotate(180deg)}
.nav-item.has-children.open>.nav-title{color:#121212;font-weight:600}

/* 子菜单折叠：高度仍由 display 决定（保证功能不出错），仅做淡入/淡出+轻微位移的顺滑过渡 */
.nav-children{display:none}
.nav-item.open>.nav-children{display:block;animation:navFadeIn .25s ease both}
.nav-item.closing>.nav-children{display:block;animation:navFadeOut .22s ease both}
@keyframes navFadeIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}
@keyframes navFadeOut{from{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-4px)}}
/* 子项错落淡入，增强层次感 */
.nav-item.open>.nav-children>.nav-item{animation:navItemIn .28s ease both}
@keyframes navItemIn{from{opacity:0;transform:translateY(-3px)}to{opacity:1;transform:translateY(0)}}

/* 展开后标题颜色加深 */
.nav-item-level1{border-bottom:1px solid #E5E5E5}
.nav-item-level1.open>.nav-title-level1{color:#1A1B1F}
.nav-item-level2.open>.nav-title-level2{color:#1A1B1F}
.nav-item-level3.open>.nav-title-level3{color:#1A1B1F}

/* 动态加载中 */
.nav-loading{font-size:12px;color:#BBB;padding-left:72px;line-height:32px}
.nav-error{font-size:12px;color:#999;padding-left:72px;line-height:32px}
.nav-empty{font-size:12px;color:#BBB;padding-left:72px;line-height:32px}

/* ========== 右侧内容区 ========== */
.help-content{flex:1;min-width:0;min-height:600px;contain:layout paint}
.content-header{padding:20px 30px;padding-bottom:10px}
.breadcrumb{font-size:13px;color:#999;font-family:PingFang SC,PingHei,Microsoft YaHei,sans-serif}
.breadcrumb span{color:#1A1B1F;font-weight:500}
.content-body{display:flex;flex-direction:column;gap:0}

/* 内容卡片 */
.content-card{background:#FFF;border-radius:4px;padding:28px 30px;transition:box-shadow .8s;box-sizing: border-box;}
.content-card:hover{background-color: #f5f5f5;}
.card-title{font-size:18px;font-weight:600;color:#121212;margin-bottom:10px}
.card-desc{font-size:14px;color:#555;line-height:1.8;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-weight: 400;}
.card-link{font-size:14px;color:#9C1D22;text-decoration:none;font-weight:500;transition:color .2s}
.card-link:hover{color:#C3242A}
/* 搜索关键字标红 */
.hl{color:#C3242A;font-style:normal}

/* 适用产品展示 */
.card-products{position:relative;padding:10px 14px;padding-left:0;border-radius:4px;font-size:13px;color:#969799;line-height:1.6}
.product-inner{max-height:1.6em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding-right:100px;transition:max-height .3s ease}
.card-products.expanded .product-inner{max-height:500px;overflow:auto;white-space:normal}
.product-label{color:#999}
.product-toggle{position:absolute;right:14px;top:10px;display:none;align-items:center;color:#999;cursor:pointer;padding-left:24px;white-space:nowrap}
.card-products.has-overflow .product-toggle{display:inline-flex}
.product-arrow{display:inline-block;width:14px;height:14px;margin-left:5px;background:url(https://hsimage.fotile.com/202608051307116896235.png) no-repeat center/100% 100%;vertical-align:middle;transition:transform .3s ease}
.card-products.expanded .product-arrow{transform:rotate(180deg)}
.product-link{color:inherit;text-decoration:none;transition:color .2s}
.product-link:hover{text-decoration:underline;color:#969799}
.product-sep{pointer-events:none}

/* 加载更多 */
.load-more-btn{
    margin-left:30px;width:fit-content;min-width:120px;
    background:#1A1B1F;border:none;border-radius:4px;
    cursor:pointer;display:flex;align-items:center;justify-content:center;
    gap:8px;transition:background .2s,opacity .2s;
    font-weight: 400;
    font-size: 12px;
    color: #EEEEEE;
    width: 120px;
    height: 45px;
    margin-top: 19px;
    box-sizing: border-box;
}
.load-more-btn:hover{background:#333}
.load-more-btn.loading{opacity:.7;cursor:not-allowed}
.load-more-btn.hidden{display:none}
.load-more-icon{display:inline-block;width:14px;height:14px;position:relative}
.load-more-icon::before,.load-more-icon::after{content:'';position:absolute;background:#FFF}
.load-more-icon::before{top:6px;left:0;width:14px;height:2px}
.load-more-icon::after{top:0;left:6px;width:2px;height:14px}

/* 加载中 / 空状态 */
.loading-tip,.empty-tip{text-align:center;color:#999;font-size:14px;padding:80px 0}
.content-card .card-title a:hover{color:#C3242A}

/* 搜索联想列表 */
#imagine{position:absolute;top:48px;left:0;width:100%;background:#FFF;border-radius:0 0 4px 4px;box-shadow:0 4px 12px rgba(0,0,0,.1);z-index:100;display:none}
#imagine li{padding:10px 20px;font-size:13px;color:#333;cursor:pointer}
#imagine li:hover{background:#F7F7F7}
.plus-icon{width: 16px;height: 16px;}
/* 骨架屏 */
.content-skeleton{display:flex;flex-direction:column;gap:16px;padding:0;transition:opacity .3s ease}
.content-skeleton.hidden{display:none}
.content-skeleton.fade-out{opacity:0;pointer-events:none}
.skeleton-card{background:#FFF;border-radius:4px;padding:28px 30px;min-height:164px;box-sizing:border-box}
.skeleton-line{height:14px;background:#F2F2F2;border-radius:4px;margin-bottom:14px;position:relative;overflow:hidden}
.skeleton-line:last-child{margin-bottom:0}
.skeleton-title{height:18px;width:60%;margin-bottom:18px}
.skeleton-medium{width:75%}
.skeleton-short{width:40%}
.skeleton-line::after{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.7) 50%,transparent 100%);transform:translateX(-100%);animation:skeleton-shimmer 1.5s infinite}
@keyframes skeleton-shimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}}
/* 分页加载时的局部骨架屏 */
.append-skeleton{display:flex;flex-direction:column;gap:16px;animation:navFadeIn .25s ease both}