/* ============================================
   91 幼幼 - 原创样式表
   品牌色系：赛车红 #E63946 / 琥珀金 #F4A261 / 机械蓝 #457B9D
   背景色系：碳纤维黑 #1D1D2B / 深钢灰 #2B2D42
   ============================================ */

/* === 基础重置 === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:#1D1D2B;color:#F1FAEE;line-height:1.7;overflow-x:hidden}
a{color:#E63946;text-decoration:none;transition:color .3s}
a:hover{color:#F4A261}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}
h5{font-size:16px;margin-bottom:16px;color:#E63946}
h6{font-size:14px;color:#A8DADC;font-weight:600}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-wrap{padding:60px 0}

/* === 头部导航 === */
.site-header{background:rgba(43,45,66,.97);position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(230,57,70,.2);backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1200px;margin:0 auto;padding:0 20px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{width:42px;height:42px;border-radius:8px}
.logo-wrap .brand-name{font-size:22px;font-weight:800;background:linear-gradient(135deg,#E63946,#F4A261);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{padding:8px 16px;border-radius:20px;font-size:15px;color:#F1FAEE;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:linear-gradient(135deg,#E63946,#F4A261);color:#fff}
.nav-toggle{display:none;background:none;border:none;color:#F1FAEE;font-size:26px;cursor:pointer}

/* === 搜索栏 === */
.search-bar-wrap{background:linear-gradient(135deg,rgba(230,57,70,.08),rgba(244,162,97,.08));padding:14px 0;border-bottom:1px solid rgba(230,57,70,.1)}
.search-bar{max-width:680px;margin:0 auto;display:flex;gap:10px;padding:0 20px}
.search-bar input{flex:1;padding:10px 20px;border-radius:25px;border:2px solid rgba(230,57,70,.3);background:rgba(43,45,66,.8);color:#F1FAEE;font-size:15px;outline:none;transition:border-color .3s}
.search-bar input:focus{border-color:#E63946}
.search-bar button{padding:10px 28px;border-radius:25px;border:none;background:linear-gradient(135deg,#E63946,#F4A261);color:#fff;font-size:15px;cursor:pointer;font-weight:600;transition:transform .2s}
.search-bar button:hover{transform:scale(1.05)}

/* === Hero 横幅 === */
.hero-section{position:relative;height:540px;overflow:hidden;display:flex;align-items:center}
.yk90p{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.5)}
.k7h36n{position:absolute;inset:0;background:linear-gradient(180deg,rgba(29,29,43,.2) 0%,rgba(29,29,43,.88) 100%)}
.us98i{position:relative;z-index:2;text-align:center;width:100%;padding:0 20px}
.us98i h1{font-size:44px;margin-bottom:14px;background:linear-gradient(135deg,#E63946,#F4A261);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.mi7sa7{font-size:20px;color:#A8DADC;margin-bottom:24px}
.i1xm8{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}
.i1xm8 span{padding:6px 18px;border-radius:20px;background:rgba(230,57,70,.15);color:#E63946;font-size:14px;border:1px solid rgba(230,57,70,.3)}
.wfqa2e{display:inline-block;margin-top:24px;padding:14px 40px;border-radius:30px;background:linear-gradient(135deg,#E63946,#F4A261);color:#fff;font-size:17px;font-weight:700;transition:transform .3s,box-shadow .3s}
.wfqa2e:hover{transform:translateY(-3px);box-shadow:0 8px 30px rgba(230,57,70,.4);color:#fff}

/* === 统计栏 === */
.5xew4pr{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:30px 0;text-align:center}
.g5128b{padding:20px;background:rgba(43,45,66,.6);border-radius:12px;border:1px solid rgba(230,57,70,.1)}
.z9vcer0{font-size:32px;font-weight:800;background:linear-gradient(135deg,#E63946,#F4A261);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.02t904r{font-size:14px;color:#A8DADC;margin-top:6px}

/* === 通用标题 === */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:30px;margin-bottom:10px;color:#F1FAEE}
.section-title p{font-size:16px;color:#A8DADC}

/* === 视频播放器 === */
.l0x8rr{max-width:800px;margin:0 auto;border-radius:16px;overflow:hidden;border:2px solid rgba(230,57,70,.2)}
.l0x8rr video{width:100%;display:block}
.9gehh3b{padding:14px 20px;background:rgba(43,45,66,.8);font-size:14px;color:#A8DADC;text-align:center}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.video-card{background:#2B2D42;border-radius:14px;overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer;text-decoration:none;color:#F1FAEE;display:block}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(230,57,70,.2);color:#F1FAEE}
.video-card .thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-icon{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(29,29,43,.5);opacity:0;transition:opacity .3s}
.video-card:hover .play-icon{opacity:1}
.video-card .play-icon span{width:56px;height:56px;background:rgba(230,57,70,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff}
.video-card .card-info{padding:14px}
.video-card .card-info h3{font-size:15px;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .meta{display:flex;justify-content:space-between;font-size:12px;color:#A8DADC}
.video-card .tag{display:inline-block;padding:3px 10px;border-radius:12px;background:rgba(230,57,70,.12);color:#E63946;font-size:12px;margin-top:6px}

/* === 分类标签 === */
.d8muaxu{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px}
.d8muaxu .tab{padding:8px 22px;border-radius:22px;background:rgba(43,45,66,.6);color:#A8DADC;font-size:14px;cursor:pointer;transition:all .3s;border:1px solid transparent}
.d8muaxu .tab.active,.d8muaxu .tab:hover{background:linear-gradient(135deg,#E63946,#F4A261);color:#fff;border-color:transparent}

/* === 服务卡片 === */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{background:linear-gradient(145deg,#2B2D42,#1D1D2B);border-radius:16px;padding:32px 24px;border:1px solid rgba(230,57,70,.1);transition:transform .3s,border-color .3s;text-align:center}
.service-card:hover{transform:translateY(-4px);border-color:rgba(230,57,70,.4)}
.service-card .svc-icon{font-size:42px;margin-bottom:16px}
.service-card h3{font-size:18px;margin-bottom:10px;color:#F1FAEE}
.service-card p{font-size:14px;color:#A8DADC;line-height:1.6}

/* === AI赋能 === */
.a1t5j1{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.bki7xq{background:linear-gradient(145deg,rgba(69,123,157,.12),rgba(43,45,66,.8));border-radius:16px;padding:28px;border:1px solid rgba(69,123,157,.2);transition:transform .3s}
.bki7xq:hover{transform:translateY(-4px)}
.bki7xq .2jyvt{font-size:38px;margin-bottom:14px}
.bki7xq h3{font-size:17px;margin-bottom:8px;color:#F1FAEE}
.bki7xq p{font-size:14px;color:#A8DADC}

/* === 社区功能 === */
.z4prd3s{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.w4kilt0{background:#2B2D42;border-radius:16px;padding:28px;text-align:center;border:1px solid rgba(244,162,97,.1);transition:transform .3s}
.w4kilt0:hover{transform:translateY(-4px)}
.w4kilt0 .ms36vgl{font-size:38px;margin-bottom:14px}
.w4kilt0 h3{font-size:17px;margin-bottom:8px}
.w4kilt0 p{font-size:14px;color:#A8DADC}

/* === 专家展示 === */
.7j37t{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.skdue55j{background:#2B2D42;border-radius:16px;overflow:hidden;text-align:center;border:1px solid rgba(230,57,70,.1);transition:transform .3s}
.skdue55j:hover{transform:translateY(-4px)}
.skdue55j .avatar{width:100%;aspect-ratio:1;object-fit:cover}
.skdue55j .card-info{padding:18px}
.skdue55j h3{font-size:16px;margin-bottom:4px}
.skdue55j .x4a39g3{font-size:13px;color:#F4A261;margin-bottom:8px}
.skdue55j p{font-size:13px;color:#A8DADC;line-height:1.5}
.skdue55j .50t4l0y{display:flex;gap:8px;justify-content:center;margin-top:12px}
.skdue55j .50t4l0y a{padding:6px 14px;border-radius:16px;font-size:12px;border:1px solid rgba(230,57,70,.3);color:#E63946;transition:all .3s}
.skdue55j .50t4l0y a:hover{background:#E63946;color:#fff}

/* === 合作品牌墙 === */
.fu7gd7n{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;padding:20px 0}
.h0d3l{padding:16px 32px;background:rgba(43,45,66,.6);border-radius:12px;font-size:18px;font-weight:700;color:#A8DADC;border:1px solid rgba(69,123,157,.15);transition:all .3s}
.h0d3l:hover{border-color:#E63946;color:#E63946}

/* === How-To 步骤 === */
.tcjvgupi{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step}
.hovdh9ij{background:#2B2D42;border-radius:16px;padding:28px;text-align:center;border:1px solid rgba(244,162,97,.1);position:relative}
.hovdh9ij .q9xd1jb{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#E63946,#F4A261);color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.hovdh9ij h3{font-size:16px;margin-bottom:8px}
.hovdh9ij p{font-size:14px;color:#A8DADC}

/* === FAQ === */
.40jk1{max-width:800px;margin:0 auto}
.faq-item{background:#2B2D42;border-radius:12px;margin-bottom:12px;border:1px solid rgba(230,57,70,.1);overflow:hidden}
.32xqj5y5{padding:18px 24px;font-size:16px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.32xqj5y5:hover{background:rgba(230,57,70,.05)}
.32xqj5y5 .h8jebgt{transition:transform .3s;color:#E63946}
.faq-item.open .32xqj5y5 .h8jebgt{transform:rotate(180deg)}
.re2jc57{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;font-size:14px;color:#A8DADC;line-height:1.7}
.faq-item.open .re2jc57{max-height:300px;padding:0 24px 18px}

/* === 用户评论 === */
.h29nhoz{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.g9rvc{background:#2B2D42;border-radius:16px;padding:24px;border:1px solid rgba(244,162,97,.1)}
.g9rvc .hbqeun1{color:#F4A261;font-size:16px;margin-bottom:10px}
.g9rvc .p9vxrq37{font-size:14px;color:#A8DADC;line-height:1.7;margin-bottom:14px}
.g9rvc .p6wa4v{display:flex;align-items:center;gap:10px}
.g9rvc .xc1l1i{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#E63946,#F4A261);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:16px}
.g9rvc .lgis7a .m9klzut{font-size:14px;font-weight:600}
.g9rvc .lgis7a .qw37jow{font-size:12px;color:#666}

/* === 分享栏 === */
.share-section{padding:40px 0;text-align:center}
.ko33j8bm{font-size:20px;margin-bottom:20px}
.lmf0ml8{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.share-btn{padding:12px 28px;border-radius:25px;font-size:14px;font-weight:600;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s;color:#fff}
.share-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.3)}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00A1D6}
.share-btn.qq{background:#12B7F5}

/* === 页脚 === */
.site-footer{background:#16182A;border-top:1px solid rgba(230,57,70,.15);padding:50px 0 0}
.ao83m{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.k43980xk h4{font-size:16px;margin-bottom:16px;color:#F1FAEE}
.k43980xk p,.k43980xk a{font-size:14px;color:#A8DADC;line-height:2}
.k43980xk a:hover{color:#E63946}
.gdepnvc{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.gdepnvc img{width:36px;height:36px;border-radius:8px}
.gdepnvc .brand-name{font-size:20px;font-weight:800;background:linear-gradient(135deg,#E63946,#F4A261);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.uv4fnsk{font-size:14px;color:#A8DADC;line-height:1.8}
.cq8o08w9{display:flex;gap:20px;margin-top:16px}
.vlsckn{text-align:center}
.vlsckn img{width:100px;height:100px;border-radius:8px;margin-bottom:6px}
.vlsckn p{font-size:12px;color:#A8DADC}
.hlhe4{border-top:1px solid rgba(230,57,70,.1);padding:20px 0;text-align:center;font-size:13px;color:#666}

/* === 面包屑 === */
.breadcrumb{padding:14px 0;font-size:13px;color:#A8DADC}
.breadcrumb a{color:#E63946}
.breadcrumb span{margin:0 8px;color:#666}

/* === 内页通用 === */
.47x74{position:relative;height:300px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.47x74 .zagffc1x{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.4)}
.47x74 .nu6pp{position:absolute;inset:0;background:linear-gradient(180deg,rgba(29,29,43,.3),rgba(29,29,43,.9))}
.47x74 .qywsbc6g{position:relative;z-index:2;text-align:center}
.47x74 h1{font-size:36px;background:linear-gradient(135deg,#E63946,#F4A261);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.47x74 p{color:#A8DADC;font-size:16px;margin-top:8px}
.p34o7fgl{font-size:15px;color:#A8DADC;line-height:1.8;margin-bottom:30px}
.8504f{max-width:800px;margin:0 auto}
.67ugix{font-size:15px;color:#A8DADC;line-height:1.8;margin-bottom:20px}
.j2puj{display:inline-block;padding:12px 32px;border-radius:25px;background:linear-gradient(135deg,#E63946,#F4A261);color:#fff;font-weight:600;transition:transform .2s}
.j2puj:hover{transform:translateY(-2px);color:#fff}
.wsyabl{display:inline-block;padding:12px 32px;border-radius:25px;border:2px solid #E63946;color:#E63946;font-weight:600;transition:all .2s}
.wsyabl:hover{background:#E63946;color:#fff}
.09l39x{display:grid;grid-template-columns:repeat(2,1fr);gap:30px}
.p9a8ccb{list-style:none}
.tjmea{display:flex;gap:14px;align-items:flex-start;margin-bottom:20px}
.xn53z{width:44px;height:44px;border-radius:12px;background:rgba(230,57,70,.1);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.q5ei7kx h4{font-size:15px;margin-bottom:4px;color:#F1FAEE}
.q5ei7kx p{font-size:14px;color:#A8DADC}
.text-center{text-align:center}
.text-muted{color:#A8DADC}
.oc89r{font-size:15px;color:#A8DADC;text-align:center;margin-bottom:30px}

/* === 懒加载 === */
img[loading="lazy"]{opacity:0;transition:opacity .5s}
img.loaded,img[loading="lazy"]{opacity:1}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .service-grid,.a1t5j1,.z4prd3s{grid-template-columns:repeat(2,1fr)}
  .7j37t{grid-template-columns:repeat(2,1fr)}
  .tcjvgupi{grid-template-columns:repeat(2,1fr)}
  .ao83m{grid-template-columns:repeat(2,1fr)}
  .5xew4pr{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#2B2D42;flex-direction:column;padding:20px;gap:8px;border-bottom:2px solid #E63946}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .hero-section{height:420px}
  .us98i h1{font-size:28px}
  .mi7sa7{font-size:16px}
  .video-grid{grid-template-columns:1fr}
  .service-grid,.a1t5j1,.z4prd3s{grid-template-columns:1fr}
  .7j37t{grid-template-columns:1fr}
  .h29nhoz{grid-template-columns:1fr}
  .tcjvgupi{grid-template-columns:1fr}
  .ao83m{grid-template-columns:1fr}
  .5xew4pr{grid-template-columns:repeat(2,1fr)}
  .09l39x{grid-template-columns:1fr}
  .section-title h2{font-size:24px}
}
@media(max-width:480px){
  .5xew4pr{grid-template-columns:1fr}
  .hero-section{height:360px}
  .us98i h1{font-size:24px}
}

/* === 辅助类 === */
.text-sm{font-size:13px}