/* ============================================
   哔咔网红视频 - 全站样式表
   naknvi.cn
   ============================================ */

/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#333;background:#fff;line-height:1.7;overflow-x:hidden}
a{color:#e74c3c;text-decoration:none;transition:color .3s}
a:hover{color:#c0392b}
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;color:#222}

/* === Layout === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-alt{background:#f8f9fa}

/* === Header === */
.site-header{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.08);position:sticky;top:0;z-index:1000}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-wrap span{font-size:1.2rem;font-weight:700;color:#2c3e50}
.main-nav{display:flex;gap:6px}
.main-nav a{padding:8px 16px;border-radius:6px;font-size:.95rem;color:#555;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:#e74c3c;color:#fff}
.mobile-menu-btn{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#333}

/* === Search Bar === */
.search-bar{background:linear-gradient(135deg,#e74c3c,#e67e22);padding:16px 0}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;background:#fff;border-radius:30px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.15)}
.search-form input{flex:1;border:none;padding:12px 24px;font-size:1rem;outline:none}
.search-form button{background:#e74c3c;color:#fff;border:none;padding:12px 28px;cursor:pointer;font-size:1rem;transition:background .3s}
.search-form button:hover{background:#c0392b}

/* === Hero === */
.hero{position:relative;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%);color:#fff;padding:80px 0 60px;text-align:center;overflow:hidden}
.hero::before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url('../images/hero-banner.jpg') center/cover;opacity:.3}
.hero .container{position:relative;z-index:2}
.hero h1{font-size:2.4rem;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.hero h1 em{font-style:normal;color:#e74c3c}
.hero p{font-size:1.15rem;opacity:.9;max-width:700px;margin:0 auto 30px}
.hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px}
.hero-tags span{background:rgba(255,255,255,.15);backdrop-filter:blur(4px);padding:6px 18px;border-radius:20px;font-size:.9rem}
.hero-cta{display:inline-flex;gap:15px;flex-wrap:wrap;justify-content:center}
.btn{display:inline-block;padding:12px 32px;border-radius:30px;font-size:1rem;font-weight:600;transition:all .3s;cursor:pointer;border:none}
.btn-primary{background:#e74c3c;color:#fff}
.btn-primary:hover{background:#c0392b;transform:translateY(-2px);box-shadow:0 6px 20px rgba(231,76,60,.4);color:#fff}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6)}
.btn-outline:hover{background:#fff;color:#333}

/* === Video Cards Grid === */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#000;cursor:pointer;transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 30px rgba(0,0,0,.2)}
.video-card img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:opacity .3s}
.video-card:hover img{opacity:.75}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(231,76,60,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s,transform .3s}
.video-card:hover .video-play-btn{opacity:1;transform:translate(-50%,-50%) scale(1.1)}
.video-play-btn::after{content:"";border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-info{position:absolute;bottom:0;left:0;right:0;padding:15px;background:linear-gradient(transparent,rgba(0,0,0,.8));color:#fff}
.video-info h3{font-size:.95rem;margin-bottom:4px}
.video-meta{display:flex;gap:12px;font-size:.8rem;opacity:.8}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{position:absolute;top:10px;left:10px;background:#e74c3c;color:#fff;padding:3px 10px;border-radius:4px;font-size:.75rem}
.video-duration{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.7);color:#fff;padding:3px 8px;border-radius:4px;font-size:.75rem}

/* === Section Titles === */
.section-title{text-align:center;margin-bottom:45px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:#e74c3c;margin:10px auto 0;border-radius:2px}
.section-title p{color:#777;font-size:1rem;max-width:600px;margin:0 auto}

/* === Feature Modules === */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:30px 20px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.06);transition:all .3s}
.feature-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.feature-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#e74c3c,#e67e22);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff}
.feature-card h4{font-size:1.05rem;margin-bottom:8px}
.feature-card p{font-size:.88rem;color:#777;line-height:1.6}

/* === AI Section === */
.ai-section{background:linear-gradient(135deg,#1a1a2e,#16213e);color:#fff;padding:70px 0}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.ai-content h2{font-size:2rem;margin-bottom:16px}
.ai-content h2 em{font-style:normal;color:#e74c3c}
.ai-content p{opacity:.85;margin-bottom:20px;line-height:1.8}
.ai-features{display:flex;flex-direction:column;gap:12px}
.ai-feat-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background:rgba(255,255,255,.08);border-radius:8px;backdrop-filter:blur(4px)}
.ai-feat-item .icon{width:40px;height:40px;background:#e74c3c;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}
.ai-image img{border-radius:16px;box-shadow:0 8px 30px rgba(0,0,0,.3)}

/* === Expert Section === */
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.expert-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.expert-card img{width:100%;aspect-ratio:1/1;object-fit:cover}
.expert-info{padding:20px}
.expert-info h4{font-size:1.1rem;margin-bottom:4px}
.expert-info .role{color:#e74c3c;font-size:.88rem;margin-bottom:8px}
.expert-info p{font-size:.85rem;color:#777;margin-bottom:12px}
.expert-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.expert-tags span{background:#fef0ef;color:#e74c3c;padding:3px 10px;border-radius:12px;font-size:.78rem}
.expert-btns{display:flex;gap:8px}
.expert-btns a{flex:1;text-align:center;padding:8px;border-radius:6px;font-size:.85rem;transition:all .3s}
.expert-btns .btn-contact{background:#e74c3c;color:#fff}
.expert-btns .btn-contact:hover{background:#c0392b}
.expert-btns .btn-works{background:#f8f9fa;color:#555}
.expert-btns .btn-works:hover{background:#eee}

/* === Partners === */
.partner-logos{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-logos .partner-item{width:140px;height:60px;background:#f8f9fa;border-radius:8px;display:flex;align-items:center;justify-content:center;font-weight:700;color:#999;font-size:.9rem;transition:all .3s}
.partner-logos .partner-item:hover{background:#fff;box-shadow:0 4px 12px rgba(0,0,0,.1);color:#555}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #eee;border-radius:10px;margin-bottom:12px;overflow:hidden;transition:all .3s}
.faq-item:hover{border-color:#e74c3c}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;background:#fff;transition:background .3s}
.faq-question:hover{background:#fef0ef}
.faq-question .arrow{transition:transform .3s;font-size:1.2rem;color:#e74c3c}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;background:#fafafa}
.faq-item.active .faq-answer{padding:16px 24px;max-height:300px}
.faq-answer p{font-size:.92rem;color:#666;line-height:1.8}

/* === Reviews === */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 15px rgba(0,0,0,.06);transition:all .3s}
.review-card:hover{box-shadow:0 8px 25px rgba(0,0,0,.12)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#e74c3c,#e67e22);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;font-size:.95rem}
.review-date{font-size:.8rem;color:#999}
.review-stars{color:#f39c12;font-size:.9rem;margin-bottom:8px}
.review-text{font-size:.9rem;color:#555;line-height:1.7}

/* === Contact === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info h3{font-size:1.3rem;margin-bottom:16px;color:#222}
.contact-list{display:flex;flex-direction:column;gap:14px}
.contact-item{display:flex;align-items:flex-start;gap:12px}
.contact-item .icon{width:40px;height:40px;background:#fef0ef;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#e74c3c;font-size:1.1rem;flex-shrink:0}
.contact-item .text{font-size:.92rem;color:#555}
.contact-item .text strong{display:block;color:#333;margin-bottom:2px}
.contact-qrcodes{display:flex;gap:30px;justify-content:center;align-items:flex-start}
.qrcode-item{text-align:center}
.qrcode-item img{width:160px;height:160px;border-radius:8px;margin-bottom:8px}
.qrcode-item p{font-size:.85rem;color:#777}

/* === How-To Guide === */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:30px}
.howto-step{text-align:center;position:relative}
.howto-step .step-num{width:50px;height:50px;background:#e74c3c;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:700;margin:0 auto 12px}
.howto-step h4{font-size:1rem;margin-bottom:6px}
.howto-step p{font-size:.85rem;color:#777}

/* === Footer === */
.site-footer{background:#1a1a2e;color:rgba(255,255,255,.7);padding:50px 0 20px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px}
.footer-brand .logo-wrap{margin-bottom:12px}
.footer-brand .logo-wrap span{color:#fff}
.footer-brand p{font-size:.88rem;line-height:1.7;opacity:.7}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:#e74c3c}
.footer-col a{display:block;padding:4px 0;font-size:.88rem;color:rgba(255,255,255,.6);transition:color .3s}
.footer-col a:hover{color:#e74c3c}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:.85rem;opacity:.6}
.social-links{display:flex;gap:12px}
.social-links a{width:36px;height:36px;background:rgba(255,255,255,.1);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;transition:all .3s;font-size:.85rem}
.social-links a:hover{background:#e74c3c;color:#fff}

/* === Share Buttons === */
.share-bar{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#111}
.share-bilibili{background:#00a1d6}

/* === Breadcrumb === */
.breadcrumb{padding:12px 0;font-size:.88rem;color:#999}
.breadcrumb a{color:#e74c3c}
.breadcrumb span{margin:0 6px}

/* === Inner Page Content === */
.page-hero{background:linear-gradient(135deg,#1a1a2e,#0f3460);color:#fff;padding:50px 0;text-align:center}
.page-hero h1{font-size:2rem;margin-bottom:10px}
.page-hero p{opacity:.8;max-width:600px;margin:0 auto}
.content-area{padding:50px 0}
.content-area h2{font-size:1.6rem;margin-bottom:16px;color:#222}
.content-area p{margin-bottom:16px;color:#555;line-height:1.8}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}
.tag-list span{background:#f8f9fa;padding:6px 14px;border-radius:16px;font-size:.85rem;color:#555;transition:all .3s}
.tag-list span:hover{background:#e74c3c;color:#fff}

/* === Community Cards === */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{background:#fff;border-radius:12px;padding:24px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.06);transition:all .3s}
.community-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.community-card .icon{font-size:2.5rem;margin-bottom:12px}
.community-card h4{margin-bottom:8px}
.community-card p{font-size:.88rem;color:#777}

/* === Responsive === */
@media(max-width:992px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .ai-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr 1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding-top:12px}
  .main-nav.show{display:flex}
  .mobile-menu-btn{display:block}
  .hero h1{font-size:1.6rem}
  .hero p{font-size:.95rem}
  .video-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .contact-qrcodes{flex-direction:column;align-items:center}
}