/* ============================================
   四虎视频 - 视频社区 原创样式
   配色：法拉利红 #d40000 + 碳纤维黑 #111111 + 钛金灰 #8a8d93
   ============================================ */

/* === 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:#0a0a0f;color:#e8e8ec;line-height:1.7;overflow-x:hidden}
a{color:#ff2d2d;text-decoration:none;transition:color .3s}
a:hover{color:#ff6b6b}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}

/* === 干扰标签隐藏 === */
.ij0bg9j3,.iexvx9a,.qxxoqq,.d5q5i,.abio9t2f,.abw1ji2z,.pt0es8s,.cu8zn,.jnqv91,.h0bg0m9g,.ey9pxy,.rwuwqjy,.t85zl,.g42ljt,.g0cn1,.gl7qk,.mk3pb{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* === 导航栏 === */
.site-nav{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(10,10,15,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(212,0,0,.25);transition:all .4s}
.site-nav.scrolled{background:rgba(10,10,15,.98);box-shadow:0 2px 20px rgba(212,0,0,.15)}
.nav-inner{max-width:1400px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{height:42px;width:42px;border-radius:8px}
.nav-logo span{font-size:1.3rem;font-weight:700;color:#fff;letter-spacing:1px}
.nav-logo .brand-dot{color:#d40000}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{padding:8px 16px;border-radius:6px;font-size:.9rem;color:#c8c8d0;transition:all .3s}
.nav-links a:hover,.nav-links a.active{color:#fff;background:rgba(212,0,0,.15)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:all .3s}

/* === 搜索框 === */
.search-bar{background:rgba(17,17,17,.8);border-bottom:1px solid rgba(138,141,147,.15);padding:12px 0}
.search-bar-inner{max-width:1400px;margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:12px}
.search-input-wrap{flex:1;position:relative;max-width:600px}
.search-input-wrap input{width:100%;padding:10px 44px 10px 18px;border:1px solid rgba(212,0,0,.3);border-radius:24px;background:rgba(255,255,255,.06);color:#fff;font-size:.9rem;outline:none;transition:border-color .3s}
.search-input-wrap input:focus{border-color:#d40000}
.search-input-wrap input::placeholder{color:#666}
.search-btn{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:#d40000;border:none;color:#fff;width:34px;height:34px;border-radius:50%;cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;transition:background .3s}
.search-btn:hover{background:#ff2d2d}
.search-hot{display:flex;gap:8px;flex-wrap:wrap}
.search-hot span{font-size:.8rem;color:#8a8d93;padding:4px 12px;background:rgba(255,255,255,.04);border-radius:12px;cursor:pointer;transition:all .3s}
.search-hot span:hover{color:#ff2d2d;background:rgba(212,0,0,.1)}

/* === Hero 区域 === */
.hero-section{position:relative;height:88vh;min-height:560px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,10,15,.3) 0%,rgba(10,10,15,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:800px;padding:0 24px}
.hero-content h1{font-size:3.2rem;font-weight:800;color:#fff;margin-bottom:16px;line-height:1.2}
.hero-content h1 .brand-red{color:#d40000}
.hero-content .hero-sub{font-size:1.2rem;color:#b0b0b8;margin-bottom:32px;line-height:1.8}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;background:linear-gradient(135deg,#d40000,#a00);color:#fff;border-radius:8px;font-size:1rem;font-weight:600;border:none;cursor:pointer;transition:all .3s;box-shadow:0 4px 20px rgba(212,0,0,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(212,0,0,.5);color:#fff}
.btn-outline{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;border:2px solid rgba(212,0,0,.5);color:#ff2d2d;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;background:transparent;transition:all .3s}
.btn-outline:hover{background:rgba(212,0,0,.1);border-color:#d40000;color:#fff}

/* === 通用区块 === */
.section{padding:80px 0}
.section-dark{background:#0a0a0f}
.section-alt{background:#0e0e14}
.section-inner{max-width:1400px;margin:0 auto;padding:0 24px}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{font-size:2rem;font-weight:700;color:#fff;margin-bottom:12px}
.section-header h2 .hl{color:#d40000}
.section-header p{color:#8a8d93;font-size:1rem;max-width:640px;margin:0 auto}
.section-tag{display:inline-block;padding:4px 14px;background:rgba(212,0,0,.12);color:#ff2d2d;border-radius:20px;font-size:.8rem;margin-bottom:12px;letter-spacing:1px}

/* === 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:#151520;transition:all .4s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(212,0,0,.2)}
.video-card .thumb{position:relative;aspect-ratio:16/9;overflow:hidden}
.video-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(212,0,0,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .4s;opacity:0}
.video-card:hover .play-icon{transform:translate(-50%,-50%) scale(1);opacity:1}
.video-card .play-icon::after{content:"";width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card .duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.video-card .card-body{padding:16px}
.video-card .card-body h3{font-size:1rem;font-weight:600;color:#e8e8ec;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;align-items:center;gap:12px;font-size:.8rem;color:#666}
.video-card .card-meta .views::before{content:"\25B6 "}
.video-card .card-meta .likes::before{content:"\2665 "}
.video-card .card-meta .comments::before{content:"\1F4AC "}

/* === 娱乐专区横向滚动 === */
.scroll-row{display:flex;gap:20px;overflow-x:auto;padding-bottom:16px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}
.scroll-row::-webkit-scrollbar{height:4px}
.scroll-row::-webkit-scrollbar-track{background:transparent}
.scroll-row::-webkit-scrollbar-thumb{background:rgba(212,0,0,.3);border-radius:4px}
.scroll-card{flex:0 0 280px;scroll-snap-align:start;border-radius:12px;overflow:hidden;background:#151520;transition:all .3s}
.scroll-card:hover{transform:scale(1.03)}
.scroll-card .thumb{aspect-ratio:16/9;overflow:hidden;position:relative}
.scroll-card .thumb img{width:100%;height:100%;object-fit:cover}
.scroll-card .info{padding:12px 14px}
.scroll-card .info h4{font-size:.9rem;color:#e8e8ec;margin-bottom:4px}
.scroll-card .info span{font-size:.75rem;color:#666}

/* === AI赋能区 === */
.ai-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:linear-gradient(145deg,#151520,#1a1a28);border:1px solid rgba(212,0,0,.12);border-radius:14px;padding:32px 24px;text-align:center;transition:all .4s}
.ai-card:hover{border-color:rgba(212,0,0,.4);transform:translateY(-4px);box-shadow:0 8px 30px rgba(212,0,0,.12)}
.ai-card .ai-icon{width:64px;height:64px;margin:0 auto 20px;background:linear-gradient(135deg,#d40000,#a00);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem}
.ai-card h3{font-size:1.1rem;color:#fff;margin-bottom:10px}
.ai-card p{font-size:.88rem;color:#8a8d93;line-height:1.6}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#151520;border-radius:14px;overflow:hidden;text-align:center;transition:all .4s;border:1px solid rgba(138,141,147,.08)}
.expert-card:hover{border-color:rgba(212,0,0,.3);transform:translateY(-4px)}
.expert-card .avatar{width:100%;aspect-ratio:1;overflow:hidden}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.expert-card:hover .avatar img{transform:scale(1.05)}
.expert-card .expert-info{padding:20px 16px}
.expert-card .expert-info h4{font-size:1rem;color:#fff;margin-bottom:4px}
.expert-card .expert-info .role{color:#d40000;font-size:.8rem;margin-bottom:8px}
.expert-card .expert-info p{font-size:.82rem;color:#8a8d93;line-height:1.5;margin-bottom:12px}
.expert-card .expert-btns{display:flex;gap:8px;justify-content:center}
.expert-card .expert-btns a{padding:6px 16px;border-radius:6px;font-size:.78rem;border:1px solid rgba(212,0,0,.3);color:#ff2d2d;transition:all .3s}
.expert-card .expert-btns a:hover{background:rgba(212,0,0,.15);color:#fff}

/* === 社区功能 === */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.community-item{background:#151520;border-radius:12px;padding:28px 20px;border:1px solid rgba(138,141,147,.06);transition:all .3s}
.community-item:hover{border-color:rgba(212,0,0,.25)}
.community-item .c-icon{font-size:2rem;margin-bottom:12px}
.community-item h4{font-size:1rem;color:#fff;margin-bottom:8px}
.community-item p{font-size:.85rem;color:#8a8d93;line-height:1.6}

/* === 合作品牌 === */
.brand-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.brand-wall .brand-item{background:rgba(255,255,255,.04);border:1px solid rgba(138,141,147,.1);border-radius:10px;padding:16px 28px;font-size:.95rem;color:#8a8d93;transition:all .3s}
.brand-wall .brand-item:hover{border-color:rgba(212,0,0,.3);color:#fff}

/* === How-To指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:40px}
.howto-step{text-align:center;padding:24px 16px}
.howto-step .step-num{width:48px;height:48px;background:linear-gradient(135deg,#d40000,#a00);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;color:#fff;margin:0 auto 14px}
.howto-step h4{font-size:1rem;color:#fff;margin-bottom:6px}
.howto-step p{font-size:.82rem;color:#8a8d93}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid rgba(138,141,147,.1);border-radius:10px;margin-bottom:12px;overflow:hidden;transition:border-color .3s}
.faq-item:hover{border-color:rgba(212,0,0,.25)}
.faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#e8e8ec;font-size:.95rem;background:rgba(21,21,32,.5)}
.faq-q::after{content:"+";font-size:1.3rem;color:#d40000;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;color:#8a8d93;font-size:.9rem;line-height:1.7}
.faq-item.open .faq-a{padding:0 24px 18px;max-height:500px}

/* === 用户评价 === */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:#151520;border-radius:12px;padding:28px 24px;border:1px solid rgba(138,141,147,.06)}
.review-card .stars{color:#d40000;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card blockquote{font-size:.92rem;color:#c8c8d0;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .r-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#d40000,#a00);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem;font-weight:700}
.review-card .reviewer .r-name{font-size:.85rem;color:#e8e8ec}
.review-card .reviewer .r-date{font-size:.75rem;color:#666}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:20px}
.contact-item{display:flex;gap:14px;align-items:flex-start}
.contact-item .c-label{font-size:.85rem;color:#8a8d93;margin-bottom:2px}
.contact-item .c-value{font-size:.95rem;color:#e8e8ec}
.qrcode-row{display:flex;gap:24px}
.qrcode-box{text-align:center}
.qrcode-box img{width:140px;height:140px;border-radius:10px;margin-bottom:8px}
.qrcode-box span{font-size:.8rem;color:#8a8d93}

/* === 社交分享 === */
.share-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.share-btn{padding:10px 20px;border-radius:8px;font-size:.85rem;color:#fff;border:none;cursor:pointer;transition:all .3s}
.share-btn.wechat{background:#07c160}
.share-btn.weibo{background:#e6162d}
.share-btn.douyin{background:#111;border:1px solid #333}
.share-btn.bilibili{background:#00a1d6}
.share-btn:hover{transform:translateY(-2px);opacity:.9}

/* === 页脚 === */
.site-footer{background:#060609;border-top:1px solid rgba(138,141,147,.08);padding:48px 0 24px}
.footer-inner{max-width:1400px;margin:0 auto;padding:0 24px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer-col h4{font-size:1rem;color:#fff;margin-bottom:16px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:#d40000}
.footer-col p{font-size:.85rem;color:#666;line-height:1.7}
.footer-col a{display:block;font-size:.85rem;color:#666;padding:4px 0;transition:color .3s}
.footer-col a:hover{color:#ff2d2d}
.footer-bottom{border-top:1px solid rgba(138,141,147,.06);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;font-size:.8rem;color:#555}
.footer-bottom a{color:#666;transition:color .3s}
.footer-bottom a:hover{color:#ff2d2d}

/* === 面包屑 === */
.breadcrumb{padding:16px 0;font-size:.85rem}
.breadcrumb-inner{max-width:1400px;margin:0 auto;padding:0 24px}
.breadcrumb a{color:#8a8d93}
.breadcrumb a:hover{color:#ff2d2d}
.breadcrumb span{color:#555;margin:0 8px}
.breadcrumb .current{color:#e8e8ec}

/* === 内页通用 === */
.page-hero{position:relative;height:360px;display:flex;align-items:center;justify-content:center;margin-top:68px;overflow:hidden}
.page-hero .hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.35)}
.page-hero .hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,10,15,.2),rgba(10,10,15,.9))}
.page-hero .hero-text{position:relative;z-index:2;text-align:center}
.page-hero h1{font-size:2.4rem;font-weight:700;color:#fff;margin-bottom:8px}
.page-hero p{color:#8a8d93;font-size:1rem}
.page-content{padding:48px 0 80px}
.page-content .content-inner{max-width:1000px;margin:0 auto;padding:0 24px}
.page-content h2{font-size:1.6rem;color:#fff;margin:32px 0 16px}
.page-content h3{font-size:1.2rem;color:#e8e8ec;margin:24px 0 12px}
.page-content p{font-size:.95rem;color:#b0b0b8;line-height:1.8;margin-bottom:16px}

/* === 动画 === */
.fade-up{opacity:0;transform:translateY(30px);transition:all .7s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .ai-features{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(10,10,15,.98);flex-direction:column;padding:16px;gap:4px;border-bottom:1px solid rgba(212,0,0,.2)}
  .nav-links.show{display:flex}
  .nav-toggle{display:flex}
  .hero-content h1{font-size:2rem}
  .hero-section{height:70vh;min-height:420px}
  .video-grid{grid-template-columns:1fr}
  .ai-features{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .community-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .section{padding:48px 0}
  .search-hot{display:none}
  .page-hero{height:260px}
  .page-hero h1{font-size:1.8rem}
}