/* ============================================
   色虎视频 - 原创样式表
   品牌色: #E83E3E (虎红) #FF6B35 (暖橙)
   深色: #1A1A2E  中性: #16213E
   浅色: #F5F5F7  强调: #FFD93D
   ============================================ */

/* Reset & Base */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;font-size:16px;}
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:#E83E3E;text-decoration:none;transition:color .3s;}
a:hover{color:#FF6B35;}
img{max-width:100%;height:auto;display:block;}
ul{list-style:none;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}

/* Header */
.site-header{position:sticky;top:0;z-index:1000;background:linear-gradient(135deg,#1A1A2E 0%,#16213E 100%);box-shadow:0 2px 20px rgba(0,0,0,.3);}
.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:0 20px;height:68px;}
.logo-area a{display:flex;align-items:center;}
.site-logo{height:42px;width:auto;}
.main-nav{flex:1;display:flex;justify-content:center;}
.nav-list{display:flex;gap:8px;}
.nav-item a{display:block;padding:8px 18px;color:#ccc;font-size:15px;border-radius:6px;transition:all .3s;}
.nav-item a:hover,.nav-item.active a{color:#fff;background:rgba(232,62,62,.2);}
.nav-item.active a{background:linear-gradient(135deg,#E83E3E,#FF6B35);font-weight:600;}
.mobile-menu-btn{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;}
.mobile-menu-btn span{width:24px;height:2px;background:#fff;border-radius:2px;transition:all .3s;}

/* Search Bar */
.search-bar-section{background:#f5f5f7;padding:16px 0;border-bottom:1px solid #e8e8e8;}
.search-wrapper{display:flex;max-width:600px;margin:0 auto;gap:0;}
.search-input{flex:1;padding:10px 18px;border:2px solid #ddd;border-right:none;border-radius:25px 0 0 25px;font-size:15px;outline:none;transition:border-color .3s;}
.search-input:focus{border-color:#E83E3E;}
.search-btn{padding:10px 28px;background:linear-gradient(135deg,#E83E3E,#FF6B35);color:#fff;border:none;border-radius:0 25px 25px 0;font-size:15px;cursor:pointer;transition:opacity .3s;}
.search-btn:hover{opacity:.9;}
.hot-tags{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:10px;flex-wrap:wrap;}
.hot-label{color:#999;font-size:13px;}
.hot-tag{font-size:13px;color:#666;padding:3px 12px;background:#fff;border-radius:15px;border:1px solid #e8e8e8;transition:all .3s;}
.hot-tag:hover{color:#E83E3E;border-color:#E83E3E;}

/* Breadcrumb */
.breadcrumb{padding:12px 0;font-size:13px;color:#999;background:#fafafa;border-bottom:1px solid #f0f0f0;}
.breadcrumb a{color:#666;}
.breadcrumb a:hover{color:#E83E3E;}
.breadcrumb span{margin:0 6px;color:#ccc;}

/* Hero Banner */
.hero-banner{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden;}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat;}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(26,26,46,.85) 0%,rgba(22,33,62,.7) 50%,rgba(232,62,62,.3) 100%);}
.hero-content{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:60px 20px;color:#fff;text-align:center;}
.hero-title{font-size:42px;font-weight:800;margin-bottom:20px;text-shadow:0 2px 10px rgba(0,0,0,.3);}
.hero-desc{font-size:18px;max-width:700px;margin:0 auto 30px;color:rgba(255,255,255,.85);line-height:1.8;}
.hero-btns{display:flex;gap:16px;justify-content:center;margin-bottom:40px;}
.btn{display:inline-block;padding:12px 32px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s;text-align:center;}
.btn-primary{background:linear-gradient(135deg,#E83E3E,#FF6B35);color:#fff;border:2px solid transparent;}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(232,62,62,.4);color:#fff;}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5);}
.btn-outline:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff;}
.btn-sm{padding:6px 18px;font-size:13px;border-radius:6px;background:linear-gradient(135deg,#E83E3E,#FF6B35);color:#fff;border:none;}
.btn-sm:hover{color:#fff;opacity:.9;}
.btn-outline-sm{background:transparent;border:1px solid #E83E3E;color:#E83E3E;}
.btn-outline-sm:hover{background:#E83E3E;color:#fff;}
.hero-stats{display:flex;justify-content:center;gap:50px;}
.stat-item{text-align:center;}
.stat-num{display:block;font-size:32px;font-weight:800;color:#FFD93D;}
.stat-label{font-size:14px;color:rgba(255,255,255,.7);}

/* Page Hero (inner pages) */
.page-hero{background:linear-gradient(135deg,#1A1A2E 0%,#16213E 50%,#E83E3E 100%);padding:50px 0;color:#fff;text-align:center;}
.page-hero h1{font-size:36px;font-weight:800;margin-bottom:12px;}
.page-hero p{font-size:16px;color:rgba(255,255,255,.8);max-width:600px;margin:0 auto;}

/* Sections */
.section{padding:60px 0;}
.section-header{text-align:center;margin-bottom:45px;}
.section-title{font-size:28px;font-weight:700;color:#1A1A2E;margin-bottom:10px;position:relative;display:inline-block;}
.section-title::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#E83E3E,#FF6B35);margin:10px auto 0;border-radius:2px;}
.section-subtitle{font-size:15px;color:#888;margin-top:8px;}
.section-more{text-align:center;margin-top:35px;}

/* Video Grid */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s;cursor:pointer;}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(0,0,0,.15);}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9;}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.video-card:hover .video-thumb img{transform:scale(1.08);}
.play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.3);opacity:0;transition:opacity .3s;}
.video-card:hover .play-overlay{opacity:1;}
.play-btn-icon{width:56px;height:56px;background:rgba(232,62,62,.9);border-radius:50%;position:relative;transition:transform .3s;}
.play-btn-icon::after{content:'';position:absolute;top:50%;left:55%;transform:translate(-50%,-50%);border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;}
.video-card:hover .play-btn-icon{transform:scale(1.1);}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;}
.video-tag{position:absolute;top:8px;left:8px;background:linear-gradient(135deg,#E83E3E,#FF6B35);color:#fff;padding:3px 10px;border-radius:4px;font-size:11px;font-weight:600;}
.video-info{padding:14px 16px;}
.video-title{font-size:15px;font-weight:600;color:#1A1A2E;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5;}
.video-desc{font-size:13px;color:#888;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.video-meta{display:flex;gap:12px;font-size:12px;color:#aaa;flex-wrap:wrap;}

/* Service Grid */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.service-card{background:#fff;border-radius:12px;padding:30px 24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s;border:1px solid #f0f0f0;}
.service-card:hover{transform:translateY(-4px);box-shadow:0 12px 35px rgba(0,0,0,.12);border-color:#E83E3E;}
.service-icon{font-size:42px;margin-bottom:16px;}
.service-card h3,.service-card h4{font-size:18px;font-weight:700;color:#1A1A2E;margin-bottom:10px;}
.service-card p{font-size:14px;color:#666;line-height:1.7;}

/* Community Grid */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.community-card{background:linear-gradient(135deg,#1A1A2E,#16213E);border-radius:12px;padding:28px 22px;text-align:center;color:#fff;transition:all .3s;}
.community-card:hover{transform:translateY(-4px);box-shadow:0 12px 35px rgba(26,26,46,.4);}
.community-icon{font-size:38px;margin-bottom:14px;}
.community-card h4{font-size:17px;font-weight:600;margin-bottom:8px;color:#FFD93D;}
.community-card p{font-size:13px;color:rgba(255,255,255,.7);line-height:1.6;}
.community-banner{margin-top:35px;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.1);}
.community-banner img{width:100%;height:auto;object-fit:cover;max-height:350px;}

/* Expert Grid */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.expert-card{background:#fff;border-radius:12px;padding:28px 20px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s;border:1px solid #f0f0f0;}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 12px 35px rgba(0,0,0,.12);}
.expert-avatar{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid #E83E3E;}
.expert-name{font-size:18px;font-weight:700;color:#1A1A2E;margin-bottom:4px;}
.expert-title{font-size:13px;color:#E83E3E;margin-bottom:10px;}
.expert-desc{font-size:13px;color:#666;line-height:1.6;margin-bottom:12px;}
.expert-tags{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:14px;}
.expert-tags span{font-size:11px;padding:3px 10px;background:#f5f5f7;border-radius:12px;color:#666;}
.expert-actions{display:flex;gap:8px;justify-content:center;}

/* Partner Wall */
.partner-wall{display:grid;grid-template-columns:repeat(6,1fr);gap:20px;}
.partner-item{background:#f5f5f7;border-radius:12px;padding:30px 20px;text-align:center;transition:all .3s;border:1px solid #e8e8e8;}
.partner-item:hover{border-color:#E83E3E;box-shadow:0 4px 15px rgba(232,62,62,.1);}
.partner-placeholder{font-size:16px;font-weight:600;color:#999;}

/* HowTo Steps */
.howto-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;}
.howto-step{text-align:center;padding:30px 20px;}
.step-num{font-size:48px;font-weight:900;background:linear-gradient(135deg,#E83E3E,#FF6B35);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:16px;}
.howto-step h4{font-size:18px;font-weight:700;color:#1A1A2E;margin-bottom:10px;}
.howto-step p{font-size:14px;color:#666;line-height:1.7;}

/* FAQ */
.faq-section{background:#f5f5f7;}
.faq-list{max-width:800px;margin:0 auto;}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.04);}
.faq-question{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;cursor:pointer;transition:background .3s;}
.faq-question:hover{background:#fafafa;}
.faq-question h3{font-size:16px;font-weight:600;color:#1A1A2E;flex:1;}
.faq-toggle{font-size:24px;color:#E83E3E;font-weight:300;transition:transform .3s;min-width:24px;text-align:center;}
.faq-item.active .faq-toggle{transform:rotate(45deg);}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px;}
.faq-answer p{font-size:14px;color:#666;line-height:1.8;}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 20px rgba(0,0,0,.06);border:1px solid #f0f0f0;transition:all .3s;}
.review-card:hover{transform:translateY(-3px);box-shadow:0 8px 30px rgba(0,0,0,.1);}
.review-stars{color:#FFD93D;font-size:18px;margin-bottom:12px;letter-spacing:2px;}
.review-text{font-size:14px;color:#555;line-height:1.7;margin-bottom:16px;font-style:italic;}
.review-author{border-top:1px solid #f0f0f0;padding-top:12px;}
.author-name{font-size:15px;font-weight:600;color:#1A1A2E;display:block;}
.author-info{font-size:12px;color:#999;}

/* Share Buttons */
.share-section{background:#1A1A2E;padding:40px 0;text-align:center;}
.share-section .section-title{color:#fff;}
.share-section .section-title::after{background:linear-gradient(90deg,#FFD93D,#FF6B35);}
.share-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}
.share-btn{display:inline-block;padding:10px 28px;border-radius:25px;color:#fff;font-size:14px;font-weight:600;transition:all .3s;}
.share-wechat{background:#07C160;}
.share-weibo{background:#E6162D;}
.share-douyin{background:#161823;}
.share-bilibili{background:#00A1D6;}
.share-qq{background:#12B7F5;}
.share-btn:hover{transform:translateY(-2px);opacity:.9;color:#fff;}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start;}
.contact-info-card{background:#f5f5f7;border-radius:12px;padding:30px;}
.contact-info-card h4{font-size:20px;font-weight:700;color:#1A1A2E;margin-bottom:18px;}
.contact-list{list-style:none;}
.contact-list li{padding:8px 0;font-size:14px;color:#555;border-bottom:1px solid #e8e8e8;}
.contact-list li:last-child{border-bottom:none;}
.contact-list li strong{color:#1A1A2E;}
.contact-qr-area{display:flex;gap:24px;justify-content:center;}
.qr-item{text-align:center;}
.qr-item img{width:180px;height:180px;border-radius:10px;border:2px solid #e8e8e8;margin-bottom:8px;}
.qr-item p{font-size:13px;color:#888;}

/* Filter Bar */
.filter-bar{margin-bottom:30px;}
.filter-bar h2{font-size:20px;font-weight:700;color:#1A1A2E;margin-bottom:14px;}
.filter-tags{display:flex;gap:10px;flex-wrap:wrap;}
.filter-tag{padding:6px 18px;border-radius:20px;font-size:14px;color:#666;background:#f5f5f7;cursor:pointer;transition:all .3s;border:1px solid transparent;}
.filter-tag:hover,.filter-tag.active{color:#fff;background:linear-gradient(135deg,#E83E3E,#FF6B35);border-color:transparent;}

/* About Content */
.about-content h2,.about-content h3{margin-bottom:16px;}
.about-text p{font-size:15px;color:#555;line-height:1.9;margin-bottom:16px;}

/* Footer */
.site-footer{background:linear-gradient(135deg,#1A1A2E 0%,#16213E 100%);color:#ccc;padding-top:50px;}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 20px;}
.footer-top{display:grid;grid-template-columns:1fr 2fr;gap:40px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand{max-width:300px;}
.footer-logo{height:36px;width:auto;margin-bottom:14px;}
.footer-desc{font-size:13px;color:rgba(255,255,255,.6);line-height:1.7;}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.footer-col h5{font-size:15px;font-weight:600;color:#FFD93D;margin-bottom:14px;}
.footer-col ul li{margin-bottom:8px;}
.footer-col ul li a{color:rgba(255,255,255,.6);font-size:13px;transition:color .3s;}
.footer-col ul li a:hover{color:#FF6B35;}
.footer-col ul li{font-size:13px;color:rgba(255,255,255,.5);}
.footer-bottom{text-align:center;padding:20px 0;font-size:13px;color:rgba(255,255,255,.4);}

/* Trust Grid */
.trust-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.trust-card{background:#fff;border-radius:12px;padding:28px 22px;box-shadow:0 4px 20px rgba(0,0,0,.06);border:1px solid #f0f0f0;transition:all .3s;}
.trust-card:hover{transform:translateY(-3px);box-shadow:0 8px 30px rgba(0,0,0,.1);border-color:#E83E3E;}
.trust-card h4{font-size:17px;font-weight:700;color:#1A1A2E;margin-bottom:10px;}
.trust-card p{font-size:14px;color:#666;line-height:1.7;}

/* Expert Card Image Fix */
.expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid #E83E3E;}
.expert-card h4{font-size:18px;font-weight:700;color:#1A1A2E;margin-bottom:4px;}
.expert-card .expert-title{font-size:13px;color:#E83E3E;margin-bottom:10px;}
.expert-card p{font-size:13px;color:#666;line-height:1.6;}

/* 404 Page */
.error-page{text-align:center;padding:100px 20px;}
.error-code{font-size:120px;font-weight:900;background:linear-gradient(135deg,#E83E3E,#FF6B35);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.error-msg{font-size:22px;color:#1A1A2E;margin:20px 0;}
.error-desc{font-size:15px;color:#888;margin-bottom:30px;}

/* Responsive */
@media(max-width:1024px){
    .video-grid{grid-template-columns:repeat(3,1fr);}
    .expert-grid{grid-template-columns:repeat(2,1fr);}
    .partner-wall{grid-template-columns:repeat(3,1fr);}
}
@media(max-width:768px){
    .main-nav{position:fixed;top:68px;left:0;right:0;background:linear-gradient(135deg,#1A1A2E,#16213E);padding:20px;transform:translateY(-120%);transition:transform .3s;z-index:999;box-shadow:0 10px 30px rgba(0,0,0,.3);}
    .main-nav.active{transform:translateY(0);}
    .nav-list{flex-direction:column;gap:4px;}
    .nav-item a{padding:12px 20px;font-size:16px;}
    .mobile-menu-btn{display:flex;}
    .hero-title{font-size:28px;}
    .hero-desc{font-size:15px;}
    .hero-stats{gap:25px;}
    .stat-num{font-size:24px;}
    .video-grid{grid-template-columns:repeat(2,1fr);gap:14px;}
    .service-grid{grid-template-columns:1fr;}
    .community-grid{grid-template-columns:1fr;}
    .trust-grid{grid-template-columns:1fr;}
    .howto-steps{grid-template-columns:1fr;}
    .review-grid{grid-template-columns:1fr;}
    .contact-grid{grid-template-columns:1fr;}
    .contact-qr-area{flex-direction:row;gap:16px;}
    .footer-top{grid-template-columns:1fr;}
    .footer-links{grid-template-columns:repeat(3,1fr);}
    .partner-wall{grid-template-columns:repeat(2,1fr);}
    .expert-grid{grid-template-columns:1fr;}
    .page-hero h1{font-size:26px;}
    .section-title{font-size:22px;}
    .hero-btns{flex-direction:column;align-items:center;}
}
@media(max-width:480px){
    .video-grid{grid-template-columns:1fr;}
    .footer-links{grid-template-columns:1fr;}
    .partner-wall{grid-template-columns:1fr;}
    .search-wrapper{flex-direction:column;gap:8px;}
    .search-input{border-radius:25px;border-right:2px solid #ddd;}
    .search-btn{border-radius:25px;}
    .hot-tags{flex-direction:column;align-items:center;}
}