/* ========================================
   色虎视频 - 原创样式表
   品牌色：虎焰红 #E8432F / 深夜蓝 #1A1A2E / 暖橙 #FF8C42
   ======================================== */

/* Reset & Base */
*,*::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;color:#2D2D3A;background:#F5F5F7;line-height:1.7}
a{color:#E8432F;text-decoration:none;transition:color .3s}
a:hover{color:#FF8C42}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:#1A1A2E;position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1200px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{width:42px;height:42px;border-radius:6px}
.logo-wrap .brand-name{color:#fff;font-size:1.3rem;font-weight:700;letter-spacing:1px}
.logo-wrap .brand-name span{color:#E8432F}

/* Navigation */
.main-nav ul{display:flex;gap:6px}
.main-nav a{color:#ddd;padding:8px 14px;border-radius:6px;font-size:.9rem;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#fff;background:linear-gradient(135deg,#E8432F,#FF8C42)}

/* Mobile menu */
.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* Search Bar */
.search-bar{background:linear-gradient(135deg,#1A1A2E 0%,#2a2a4e 100%);padding:16px 0}
.search-inner{max-width:700px;margin:0 auto;display:flex;gap:10px;padding:0 20px}
.search-inner input{flex:1;padding:12px 20px;border:2px solid #E8432F;border-radius:30px;background:#fff;font-size:1rem;outline:none;transition:border-color .3s}
.search-inner input:focus{border-color:#FF8C42}
.search-inner button{padding:12px 28px;background:linear-gradient(135deg,#E8432F,#FF8C42);color:#fff;border:none;border-radius:30px;font-size:1rem;cursor:pointer;transition:transform .2s}
.search-inner button:hover{transform:scale(1.05)}

/* Hero Banner */
.hero{position:relative;overflow:hidden;min-height:420px;display:flex;align-items:center;justify-content:center;background:#1A1A2E}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.7}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;padding:40px 20px}
.hero h1{font-size:2.6rem;font-weight:800;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero h1 span{color:#FF8C42}
.hero p{font-size:1.15rem;max-width:650px;margin:0 auto 24px;opacity:.9;line-height:1.8}
.hero-btn{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#E8432F,#FF8C42);color:#fff;border-radius:30px;font-size:1.05rem;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(232,67,47,.4);color:#fff}

/* Section Titles */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.9rem;font-weight:700;color:#1A1A2E;margin-bottom:8px}
.section-title h2 span{color:#E8432F}
.section-title p{color:#666;font-size:1rem}
.section-title .divider{width:60px;height:4px;background:linear-gradient(90deg,#E8432F,#FF8C42);margin:12px auto 0;border-radius:2px}

/* Video Cards Grid */
.video-section{padding:60px 0}
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#fff;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 30px rgba(0,0,0,.15)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img,.video-card .thumb video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img,.video-card:hover .thumb video{transform:scale(1.08)}
.video-card .play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.4);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn .icon{width:56px;height:56px;background:rgba(232,67,47,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s}
.play-btn .icon::after{content:"";border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.video-card:hover .play-btn .icon{transform:scale(1.1)}
.video-card .card-info{padding:14px 16px}
.video-card .card-title{font-size:.95rem;font-weight:600;color:#1A1A2E;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;justify-content:space-between;font-size:.8rem;color:#888}
.video-card .card-meta .views{color:#E8432F}
.video-card .tag{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,#E8432F,#FF8C42);color:#fff;padding:3px 10px;border-radius:4px;font-size:.75rem;z-index:3}

/* Services Section */
.services-section{padding:60px 0;background:#fff}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{padding:30px 24px;border-radius:12px;background:linear-gradient(145deg,#f8f9fa,#fff);border:1px solid #eee;text-align:center;transition:all .3s}
.service-card:hover{border-color:#E8432F;box-shadow:0 8px 25px rgba(232,67,47,.1)}
.service-card .icon-box{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#E8432F,#FF8C42);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff}
.service-card h3{font-size:1.1rem;color:#1A1A2E;margin-bottom:10px}
.service-card p{font-size:.9rem;color:#666;line-height:1.6}

/* AI Section */
.ai-section{padding:60px 0;background:linear-gradient(135deg,#1A1A2E 0%,#2a2a4e 100%);color:#fff}
.ai-section .section-title h2{color:#fff}
.ai-section .section-title p{color:#aaa}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
.ai-grid img{border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,.3)}
.ai-features{display:flex;flex-direction:column;gap:20px}
.ai-feature-item{display:flex;gap:16px;align-items:flex-start}
.ai-feature-item .num{min-width:40px;height:40px;background:linear-gradient(135deg,#E8432F,#FF8C42);border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem}
.ai-feature-item h4{font-size:1.05rem;margin-bottom:4px}
.ai-feature-item p{font-size:.88rem;color:#bbb;line-height:1.6}

/* Community Section */
.community-section{padding:60px 0}
.community-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.community-card{background:#fff;border-radius:12px;padding:24px;text-align:center;border:1px solid #eee;transition:all .3s}
.community-card:hover{border-color:#E8432F;transform:translateY(-4px);box-shadow:0 8px 20px rgba(0,0,0,.08)}
.community-card .comm-icon{font-size:2.2rem;margin-bottom:12px}
.community-card h4{font-size:1rem;color:#1A1A2E;margin-bottom:8px}
.community-card p{font-size:.85rem;color:#666}

/* Expert Section */
.expert-section{padding:60px 0;background:#fff}
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.expert-card{background:#f8f9fa;border-radius:12px;overflow:hidden;transition:all .3s}
.expert-card:hover{box-shadow:0 8px 25px rgba(0,0,0,.1);transform:translateY(-4px)}
.expert-card .expert-img{width:100%;aspect-ratio:1;object-fit:cover}
.expert-card .expert-info{padding:20px}
.expert-card h4{font-size:1.05rem;color:#1A1A2E;margin-bottom:4px}
.expert-card .title{color:#E8432F;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#666;line-height:1.6;margin-bottom:12px}
.expert-card .expert-btns{display:flex;gap:8px}
.expert-card .btn-sm{padding:6px 14px;border-radius:6px;font-size:.8rem;border:1px solid #E8432F;color:#E8432F;transition:all .3s;cursor:pointer;background:none}
.expert-card .btn-sm:hover{background:#E8432F;color:#fff}

/* Partners */
.partners-section{padding:50px 0}
.partner-logos{display:flex;justify-content:center;align-items:center;gap:40px;flex-wrap:wrap;opacity:.6}
.partner-logos span{font-size:1.2rem;font-weight:700;color:#666;padding:10px 20px;border:2px solid #ddd;border-radius:8px}

/* Reviews */
.reviews-section{padding:60px 0;background:#fff}
.reviews-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.review-card{background:#f8f9fa;border-radius:12px;padding:24px;border-left:4px solid #E8432F}
.review-card .stars{color:#FF8C42;font-size:1.1rem;margin-bottom:10px}
.review-card blockquote{font-size:.92rem;color:#444;line-height:1.7;margin-bottom:12px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#E8432F,#FF8C42);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.85rem}
.review-card .reviewer .name{font-weight:600;font-size:.88rem;color:#1A1A2E}
.review-card .reviewer .date{font-size:.78rem;color:#999}

/* FAQ */
.faq-section{padding:60px 0}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid #eee}
.faq-item .faq-q{padding:18px 24px;font-weight:600;color:#1A1A2E;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-item .faq-q:hover{background:#fef5f3}
.faq-item .faq-q .arrow{transition:transform .3s;color:#E8432F;font-size:1.2rem}
.faq-item.active .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#555;font-size:.92rem;line-height:1.7}
.faq-item.active .faq-a{padding:0 24px 18px;max-height:500px}

/* Contact */
.contact-section{padding:60px 0;background:linear-gradient(135deg,#1A1A2E 0%,#2a2a4e 100%);color:#fff}
.contact-section .section-title h2{color:#fff}
.contact-section .section-title p{color:#aaa}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info{display:flex;flex-direction:column;gap:16px}
.contact-item{display:flex;gap:12px;align-items:flex-start}
.contact-item .ci-icon{min-width:40px;height:40px;background:rgba(232,67,47,.2);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#E8432F;font-size:1.1rem}
.contact-item h4{font-size:.95rem;margin-bottom:2px}
.contact-item p{font-size:.88rem;color:#bbb}
.contact-qrcodes{display:flex;gap:20px;justify-content:center;align-items:flex-start}
.qr-item{text-align:center}
.qr-item img{width:150px;height:150px;border-radius:8px;border:3px solid rgba(255,255,255,.1)}
.qr-item p{margin-top:8px;font-size:.85rem;color:#aaa}

/* How-To Guide */
.howto-section{padding:60px 0;background:#fff}
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:900px;margin:0 auto}
.howto-step{text-align:center;padding:20px}
.howto-step .step-num{width:48px;height:48px;margin:0 auto 12px;background:linear-gradient(135deg,#E8432F,#FF8C42);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.2rem}
.howto-step h4{font-size:.95rem;color:#1A1A2E;margin-bottom:6px}
.howto-step p{font-size:.82rem;color:#666}

/* Share Buttons */
.share-section{padding:30px 0;background:#f8f9fa;text-align:center}
.share-btns{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.share-btn{padding:10px 20px;border-radius:8px;color:#fff;font-size:.88rem;cursor:pointer;transition:transform .2s;border:none}
.share-btn:hover{transform:scale(1.05)}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00A1D6}

/* Footer */
.site-footer{background:#0d0d1a;color:#aaa;padding:40px 0 20px}
.footer-inner{display:grid;grid-template-columns:1fr 1fr 1fr;gap:30px;max-width:1200px;margin:0 auto;padding:0 20px}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:14px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:3px;background:linear-gradient(90deg,#E8432F,#FF8C42);border-radius:2px}
.footer-col a{display:block;color:#888;font-size:.88rem;padding:4px 0;transition:color .3s}
.footer-col a:hover{color:#E8432F}
.footer-col p{font-size:.85rem;line-height:1.7}
.footer-bottom{text-align:center;padding-top:24px;margin-top:24px;border-top:1px solid #222;font-size:.82rem}
.footer-bottom .update-time{color:#666;margin-top:6px}

/* Breadcrumb */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#E8432F}
.breadcrumb span{margin:0 6px;color:#ccc}

/* Inner Page */
.inner-hero{background:linear-gradient(135deg,#1A1A2E,#2a2a4e);padding:50px 0;text-align:center;color:#fff}
.inner-hero h1{font-size:2rem;font-weight:700;margin-bottom:8px}
.inner-hero p{color:#aaa;font-size:1rem}
.inner-content{padding:50px 0}
.inner-content h2{font-size:1.5rem;color:#1A1A2E;margin-bottom:16px}
.inner-content h3{font-size:1.2rem;color:#1A1A2E;margin:24px 0 12px}
.inner-content p{margin-bottom:16px;line-height:1.8;color:#444}

/* Video List Page */
.video-list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}

/* Responsive */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .community-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .menu-toggle{display:block}
  .main-nav{position:fixed;top:62px;left:0;right:0;background:#1A1A2E;padding:20px;transform:translateY(-120%);transition:transform .3s;z-index:999}
  .main-nav.active{transform:translateY(0)}
  .main-nav ul{flex-direction:column;gap:4px}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .services-grid{grid-template-columns:1fr}
  .ai-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .community-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr}
  .hero h1{font-size:1.8rem}
  .hero p{font-size:1rem}
  .video-list-grid{grid-template-columns:repeat(2,1fr)}
  .header-inner{padding:8px 16px}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .community-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .video-list-grid{grid-template-columns:1fr}
}

/* Footer Logo */
.footer-logo{margin-bottom:16px}
.footer-logo a{display:inline-flex;align-items:center;gap:8px}

/* Lazy Load */
img[data-src]{opacity:0;transition:opacity .5s}
img.loaded{opacity:1}

/* Animations */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeInUp .6s ease forwards}