/* ============================================
   暗网 - 原创样式表
   品牌色系：糖心粉红 #E8456B / 暖橘 #FF7E5F / 深夜蓝黑 #1A1A2E
   ============================================ */

/* === 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','Hiragino Sans GB','Microsoft YaHei','WenQuanYi Micro Hei',sans-serif;background:#0F0F1A;color:#F5F5F5;line-height:1.7;overflow-x:hidden}
a{color:#E8456B;text-decoration:none;transition:color .3s}
a:hover{color:#FF7E5F}
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}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:#F5F5F5;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#E8456B,#FF7E5F);border-radius:2px}
.section-title p{color:#B0B0C0;margin-top:10px;font-size:.95rem}

/* === 顶部导航 === */
.header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,15,26,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(232,69,107,.15);transition:all .3s}
.header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.header-logo{display:flex;align-items:center;gap:10px}
.header-logo img{height:36px;width:auto}
.header-logo span{font-size:1.2rem;font-weight:700;background:linear-gradient(135deg,#E8456B,#FF7E5F);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-list{display:flex;gap:28px;align-items:center}
.nav-list a{color:#B0B0C0;font-size:.95rem;position:relative;padding:4px 0;transition:color .3s}
.nav-list a::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background:linear-gradient(90deg,#E8456B,#FF7E5F);transition:width .3s}
.nav-list a:hover,.nav-list a.active{color:#F5F5F5}
.nav-list a:hover::after,.nav-list a.active::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:5px}
.nav-toggle span{width:24px;height:2px;background:#F5F5F5;transition:all .3s}

/* === 搜索框 === */
.search-bar{background:rgba(26,26,46,.8);border-bottom:1px solid rgba(232,69,107,.1);padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-wrapper{position:relative;width:100%;max-width:560px}
.search-wrapper input{width:100%;padding:10px 44px 10px 18px;border-radius:24px;border:1px solid rgba(232,69,107,.3);background:rgba(22,33,62,.6);color:#F5F5F5;font-size:.9rem;outline:none;transition:border-color .3s}
.search-wrapper input::placeholder{color:#666}
.search-wrapper input:focus{border-color:#E8456B}
.search-wrapper .search-btn{position:absolute;right:4px;top:50%;transform:translateY(-50%);width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#E8456B,#FF7E5F);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center}
.search-wrapper .search-btn svg{width:16px;height:16px;fill:#fff}

/* === Hero区域 === */
.hero{position:relative;min-height:520px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:64px;background:#0F0F1A}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.45}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,15,26,.3) 0%,rgba(15,15,26,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;padding:40px 20px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;background:linear-gradient(135deg,#E8456B,#FF7E5F,#FFD93D);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content .subtitle{font-size:1.15rem;color:#B0B0C0;margin-bottom:28px;max-width:600px;margin-left:auto;margin-right:auto}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;border-radius:28px;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;font-size:1rem;font-weight:600;border:none;cursor:pointer;transition:transform .3s,box-shadow .3s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(232,69,107,.4);color:#fff}
.btn-outline{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;border-radius:28px;border:2px solid rgba(232,69,107,.5);color:#E8456B;font-size:1rem;font-weight:600;background:transparent;cursor:pointer;transition:all .3s}
.btn-outline:hover{background:rgba(232,69,107,.1);border-color:#E8456B;color:#E8456B}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#16213E;transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(232,69,107,.2)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.05)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;border-radius:50%;background:rgba(232,69,107,.85);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;pointer-events:none}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:24px;height:24px;fill:#fff;margin-left:3px}
.video-card .card-info{padding:14px 16px}
.video-card .card-title{font-size:.95rem;font-weight:600;color:#F5F5F5;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;gap:12px;font-size:.8rem;color:#888}
.video-card .card-meta span{display:flex;align-items:center;gap:4px}
.video-card .tag{position:absolute;top:10px;left:10px;padding:3px 10px;border-radius:4px;font-size:.75rem;background:rgba(232,69,107,.85);color:#fff;z-index:2}
.video-card .duration{position:absolute;bottom:10px;right:10px;padding:2px 8px;border-radius:4px;font-size:.75rem;background:rgba(0,0,0,.7);color:#fff;z-index:2}

/* === 服务模块 === */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-item{background:linear-gradient(145deg,rgba(22,33,62,.8),rgba(26,26,46,.6));border:1px solid rgba(232,69,107,.12);border-radius:14px;padding:32px 24px;text-align:center;transition:all .3s}
.service-item:hover{border-color:rgba(232,69,107,.4);transform:translateY(-4px);box-shadow:0 8px 24px rgba(232,69,107,.1)}
.service-icon{width:64px;height:64px;margin:0 auto 18px;border-radius:16px;background:linear-gradient(135deg,rgba(232,69,107,.15),rgba(255,126,95,.1));display:flex;align-items:center;justify-content:center}
.service-icon svg{width:32px;height:32px;fill:#E8456B}
.service-item h3{font-size:1.1rem;color:#F5F5F5;margin-bottom:10px}
.service-item p{font-size:.88rem;color:#B0B0C0;line-height:1.6}

/* === AI赋能 === */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{position:relative;border-radius:14px;overflow:hidden;background:#16213E;border:1px solid rgba(255,217,61,.1);transition:all .3s}
.ai-card:hover{border-color:rgba(255,217,61,.3);box-shadow:0 8px 24px rgba(255,217,61,.1)}
.ai-card img{width:100%;height:200px;object-fit:cover}
.ai-card .ai-info{padding:20px}
.ai-card h3{font-size:1.05rem;color:#FFD93D;margin-bottom:8px}
.ai-card p{font-size:.88rem;color:#B0B0C0;line-height:1.6}

/* === 社区模块 === */
.community-flex{display:flex;gap:24px;flex-wrap:wrap}
.community-card{flex:1;min-width:280px;border-radius:14px;overflow:hidden;background:#16213E;border:1px solid rgba(232,69,107,.1);transition:all .3s}
.community-card:hover{border-color:rgba(232,69,107,.3);transform:translateY(-4px)}
.community-card img{width:100%;height:200px;object-fit:cover}
.community-card .comm-info{padding:20px}
.community-card h3{font-size:1.05rem;color:#F5F5F5;margin-bottom:8px}
.community-card p{font-size:.88rem;color:#B0B0C0}

/* === 专家团队 === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:linear-gradient(145deg,rgba(22,33,62,.8),rgba(26,26,46,.6));border:1px solid rgba(232,69,107,.1);border-radius:14px;padding:28px 20px;text-align:center;transition:all .3s}
.expert-card:hover{border-color:rgba(232,69,107,.3);transform:translateY(-4px)}
.expert-card .avatar{width:96px;height:96px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid rgba(232,69,107,.3)}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h3{font-size:1rem;color:#F5F5F5;margin-bottom:4px}
.expert-card .role{font-size:.82rem;color:#E8456B;margin-bottom:10px}
.expert-card p{font-size:.82rem;color:#B0B0C0;line-height:1.5;margin-bottom:14px}
.expert-card .expert-btns{display:flex;gap:8px;justify-content:center}
.expert-card .expert-btns a{padding:6px 14px;border-radius:16px;font-size:.78rem;border:1px solid rgba(232,69,107,.4);color:#E8456B;transition:all .3s}
.expert-card .expert-btns a:hover{background:rgba(232,69,107,.15)}

/* === 合作品牌 === */
.partner-wall{display:flex;gap:32px;justify-content:center;align-items:center;flex-wrap:wrap;padding:20px 0}
.partner-item{width:120px;height:60px;background:rgba(22,33,62,.6);border-radius:10px;display:flex;align-items:center;justify-content:center;border:1px solid rgba(232,69,107,.08);transition:all .3s;padding:10px}
.partner-item:hover{border-color:rgba(232,69,107,.3);background:rgba(22,33,62,.9)}
.partner-item span{font-size:.85rem;color:#B0B0C0;font-weight:600}

/* === 用户评价 === */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:linear-gradient(145deg,rgba(22,33,62,.8),rgba(26,26,46,.6));border:1px solid rgba(232,69,107,.1);border-radius:14px;padding:24px;transition:all .3s}
.review-card:hover{border-color:rgba(232,69,107,.25)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#E8456B,#FF7E5F);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1rem}
.review-name{font-size:.92rem;color:#F5F5F5;font-weight:600}
.review-date{font-size:.78rem;color:#888}
.review-stars{color:#FFD93D;font-size:.85rem;margin-bottom:8px;letter-spacing:2px}
.review-text{font-size:.88rem;color:#B0B0C0;line-height:1.7}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:rgba(22,33,62,.6);border:1px solid rgba(232,69,107,.1);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:border-color .3s}
.faq-item:hover{border-color:rgba(232,69,107,.25)}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:.95rem;font-weight:600;color:#F5F5F5;transition:background .3s}
.faq-question:hover{background:rgba(232,69,107,.05)}
.faq-question .arrow{font-size:1.2rem;color:#E8456B;transition:transform .3s}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}
.faq-answer p{font-size:.88rem;color:#B0B0C0;line-height:1.7}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-info{background:rgba(22,33,62,.6);border:1px solid rgba(232,69,107,.1);border-radius:14px;padding:32px}
.contact-info h3{font-size:1.2rem;color:#F5F5F5;margin-bottom:20px}
.contact-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px}
.contact-item .icon{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,rgba(232,69,107,.15),rgba(255,126,95,.1));display:flex;align-items:center;justify-content:center;flex-shrink:0}
.contact-item .icon svg{width:18px;height:18px;fill:#E8456B}
.contact-item .text{font-size:.9rem;color:#B0B0C0}
.contact-item .text strong{color:#F5F5F5;display:block;margin-bottom:2px}
.contact-qr{display:flex;gap:24px;justify-content:center}
.qr-box{text-align:center}
.qr-box img{width:160px;height:160px;border-radius:10px;margin-bottom:8px}
.qr-box p{font-size:.82rem;color:#B0B0C0}

/* === 页脚 === */
.footer{background:#0a0a14;border-top:1px solid rgba(232,69,107,.1);padding:40px 0 20px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand .footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand .footer-logo img{height:32px}
.footer-brand .footer-logo span{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,#E8456B,#FF7E5F);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.footer-brand p{font-size:.85rem;color:#888;line-height:1.6}
.footer-col h4{font-size:.95rem;color:#F5F5F5;margin-bottom:14px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:24px;height:2px;background:#E8456B}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:.85rem;color:#888;transition:color .3s}
.footer-col ul li a:hover{color:#E8456B}
.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:.82rem;color:#666}
.social-links{display:flex;gap:12px}
.social-links a{width:36px;height:36px;border-radius:50%;background:rgba(232,69,107,.1);display:flex;align-items:center;justify-content:center;transition:all .3s}
.social-links a:hover{background:rgba(232,69,107,.3)}
.social-links a svg{width:16px;height:16px;fill:#E8456B}

/* === 面包屑 === */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#B0B0C0}
.breadcrumb span{color:#E8456B}

/* === 内页通用 === */
.page-hero{padding:100px 0 40px;text-align:center;background:linear-gradient(180deg,rgba(232,69,107,.08),transparent)}
.page-hero h1{font-size:2.2rem;background:linear-gradient(135deg,#E8456B,#FF7E5F);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}
.page-hero p{color:#B0B0C0;font-size:1rem}
.content-block{background:rgba(22,33,62,.4);border:1px solid rgba(232,69,107,.08);border-radius:14px;padding:32px;margin-bottom:24px}
.content-block h2{font-size:1.4rem;color:#F5F5F5;margin-bottom:16px}
.content-block h3{font-size:1.15rem;color:#E8456B;margin-bottom:12px}
.content-block p{font-size:.92rem;color:#B0B0C0;line-height:1.8;margin-bottom:12px}

/* === How-To指南 === */
.howto-steps{counter-reset:step}
.howto-step{counter-increment:step;position:relative;padding-left:60px;margin-bottom:24px}
.howto-step::before{content:counter(step);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem}
.howto-step h4{font-size:1rem;color:#F5F5F5;margin-bottom:6px}
.howto-step p{font-size:.88rem;color:#B0B0C0}

/* === 分享按钮 === */
.share-bar{display:flex;gap:10px;justify-content:center;padding:20px 0}
.share-btn{padding:8px 18px;border-radius:20px;font-size:.82rem;border:1px solid rgba(232,69,107,.3);color:#B0B0C0;background:transparent;cursor:pointer;transition:all .3s}
.share-btn:hover{background:rgba(232,69,107,.15);color:#E8456B;border-color:#E8456B}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid,.service-grid,.ai-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .nav-list{display:none;position:absolute;top:64px;left:0;width:100%;background:rgba(15,15,26,.98);flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid rgba(232,69,107,.15)}
  .nav-list.active{display:flex}
  .nav-toggle{display:flex}
  .hero-content h1{font-size:2rem}
  .video-grid,.service-grid,.ai-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr 1fr}
  .review-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .contact-qr{flex-direction:column;align-items:center}
  .hero{min-height:400px}
  .section{padding:40px 0}
}
@media(max-width:480px){
  .expert-grid{grid-template-columns:1fr}
  .hero-content h1{font-size:1.6rem}
  .section-title h2{font-size:1.5rem}
  .partner-wall{gap:16px}
  .partner-item{width:100px;height:50px}
}

/* === 动画 === */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .6s,transform .6s}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* === 滚动条 === */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:#0F0F1A}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#E8456B,#FF7E5F);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:#E8456B}