/* ============================================
   幼幼 - 全站样式表
   hratxw.cn
   ============================================ */

/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
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:#1a1a2e;line-height:1.7;background:#f8f9fa}
a{color:#2d6a4f;text-decoration:none;transition:color .3s}
a:hover{color:#40916c}
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}

/* === Noise Cluster (干扰标签隐藏) === */
.noise-cluster{position:absolute;left:-99999px;top:-99999px;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* === Layout === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:#1a1a2e;margin-bottom:10px}
.section-title p{color:#6c757d;font-size:1.05rem;max-width:700px;margin:0 auto}

/* === 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-link{display:flex;align-items:center;gap:10px}
.logo-link img{height:42px;width:auto}
.logo-link span{font-size:1.3rem;font-weight:800;color:#2d6a4f}
.main-nav{display:flex;gap:24px;align-items:center}
.main-nav a{font-size:.95rem;font-weight:500;color:#333;padding:6px 0;border-bottom:2px solid transparent;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#2d6a4f;border-bottom-color:#2d6a4f}
.search-box{display:flex;align-items:center;background:#f1f3f5;border-radius:20px;padding:6px 14px;gap:6px}
.search-box input{border:none;background:transparent;outline:none;font-size:.9rem;width:160px}
.search-box button{border:none;background:transparent;cursor:pointer;color:#6c757d;font-size:1rem}
.mobile-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#333}

/* === Hero Banner === */
.hero{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.65)}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;max-width:800px;padding:0 20px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.4)}
.hero-content p{font-size:1.15rem;margin-bottom:24px;text-shadow:0 1px 4px rgba(0,0,0,.3);line-height:1.8}
.hero-btn{display:inline-block;background:#2d6a4f;color:#fff;padding:12px 32px;border-radius:25px;font-size:1rem;font-weight:600;transition:all .3s;box-shadow:0 4px 15px rgba(45,106,79,.4)}
.hero-btn:hover{background:#40916c;transform:translateY(-2px);color:#fff}

/* === Breadcrumb === */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#6c757d}
.breadcrumb a{color:#2d6a4f}
.breadcrumb span{margin:0 6px}

/* === Video Grid === */
.video-section{padding:60px 0}
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(45,106,79,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer}
.play-btn::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{opacity:1}
.video-info{padding:14px 16px}
.video-info h3{font-size:.95rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#999}
.video-meta span{display:flex;align-items:center;gap:3px}
.video-tag{display:inline-block;background:#e8f5e9;color:#2d6a4f;font-size:.75rem;padding:2px 8px;border-radius:10px;margin-top:6px}
.ranking-badge{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,#f59e0b,#ef4444);color:#fff;font-size:.75rem;font-weight:700;padding:3px 8px;border-radius:6px;z-index:2}

/* === Services Grid === */
.services-section{padding:60px 0;background:#fff}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{background:#f8f9fa;border-radius:12px;padding:30px 24px;text-align:center;transition:all .3s;border:1px solid #e9ecef}
.service-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.08);border-color:#2d6a4f}
.service-icon{width:64px;height:64px;background:linear-gradient(135deg,#2d6a4f,#40916c);border-radius:16px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:1.8rem;color:#fff}
.service-card h3{font-size:1.05rem;margin-bottom:8px;color:#1a1a2e}
.service-card p{font-size:.9rem;color:#6c757d;line-height:1.6}

/* === AI Section === */
.ai-section{padding:60px 0;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);color:#fff}
.ai-section .section-title h2{color:#fff}
.ai-section .section-title p{color:#adb5bd}
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:28px 22px;text-align:center;transition:all .3s;backdrop-filter:blur(10px)}
.ai-card:hover{background:rgba(255,255,255,.15);transform:translateY(-4px)}
.ai-card .icon{font-size:2.2rem;margin-bottom:14px}
.ai-card h3{font-size:1rem;margin-bottom:8px}
.ai-card p{font-size:.88rem;color:#adb5bd;line-height:1.6}

/* === Community Section === */
.community-section{padding:60px 0}
.community-banner{position:relative;border-radius:16px;overflow:hidden;height:280px;margin-bottom:30px}
.community-banner img{width:100%;height:100%;object-fit:cover}
.community-banner .overlay{position:absolute;inset:0;background:linear-gradient(to right,rgba(45,106,79,.85),rgba(45,106,79,.3));display:flex;align-items:center;padding:0 50px}
.community-banner .overlay h2{color:#fff;font-size:2rem;max-width:500px}
.community-features{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.community-feature{background:#fff;border-radius:12px;padding:24px 18px;text-align:center;border:1px solid #e9ecef;transition:all .3s}
.community-feature:hover{border-color:#2d6a4f;box-shadow:0 4px 15px rgba(45,106,79,.1)}
.community-feature .icon{font-size:2rem;margin-bottom:10px}
.community-feature h4{font-size:.95rem;margin-bottom:6px;color:#1a1a2e}
.community-feature p{font-size:.85rem;color:#6c757d}

/* === Expert Section === */
.expert-section{padding:60px 0;background:#fff}
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.expert-card{background:#f8f9fa;border-radius:16px;overflow:hidden;text-align:center;transition:all .3s;border:1px solid #e9ecef}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.1)}
.expert-card img{width:100%;height:300px;object-fit:cover}
.expert-card .info{padding:20px}
.expert-card h3{font-size:1.1rem;margin-bottom:4px}
.expert-card .role{color:#2d6a4f;font-size:.88rem;margin-bottom:8px}
.expert-card p{font-size:.85rem;color:#6c757d;line-height:1.6;margin-bottom:12px}
.expert-card .awards{font-size:.8rem;color:#f59e0b;margin-bottom:12px}
.expert-btn{display:inline-block;background:#2d6a4f;color:#fff;padding:8px 20px;border-radius:20px;font-size:.85rem;transition:all .3s}
.expert-btn:hover{background:#40916c;color:#fff}

/* === Reviews Section === */
.reviews-section{padding:60px 0}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06);border-left:4px solid #2d6a4f}
.review-card .stars{color:#f59e0b;font-size:1rem;margin-bottom:8px}
.review-card p{font-size:.9rem;color:#555;line-height:1.7;margin-bottom:12px;font-style:italic}
.review-card .author{font-size:.85rem;color:#999}

/* === FAQ Section === */
.faq-section{padding:60px 0;background:#fff}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #e9ecef;border-radius:10px;margin-bottom:12px;overflow:hidden}
.faq-question{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;background:#f8f9fa;transition:background .3s}
.faq-question:hover{background:#e8f5e9}
.faq-question .arrow{transition:transform .3s;font-size:1.2rem}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 20px;max-height:0;overflow:hidden;transition:all .4s ease;font-size:.9rem;color:#555;line-height:1.7}
.faq-item.active .faq-answer{padding:16px 20px;max-height:500px}

/* === Partners Section === */
.partners-section{padding:60px 0}
.partners-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-logo{width:140px;height:60px;background:#fff;border:1px solid #e9ecef;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.85rem;color:#6c757d;font-weight:600;transition:all .3s}
.partner-logo:hover{border-color:#2d6a4f;box-shadow:0 2px 8px rgba(45,106,79,.15)}

/* === How-To Section === */
.howto-section{padding:60px 0;background:#fff}
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:1000px;margin:0 auto}
.howto-step{text-align:center;position:relative}
.howto-step .step-num{width:48px;height:48px;background:#2d6a4f;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;margin:0 auto 14px}
.howto-step h4{font-size:.95rem;margin-bottom:6px}
.howto-step p{font-size:.85rem;color:#6c757d}

/* === Contact Section === */
.contact-section{padding:60px 0}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info h3{font-size:1.3rem;margin-bottom:16px;color:#1a1a2e}
.contact-item{display:flex;gap:12px;margin-bottom:16px;align-items:flex-start}
.contact-item .icon{width:40px;height:40px;background:#e8f5e9;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.contact-item .text{font-size:.9rem;color:#555}
.contact-item .text strong{display:block;color:#1a1a2e;margin-bottom:2px}
.qrcode-grid{display:flex;gap:24px;margin-top:20px}
.qrcode-item{text-align:center}
.qrcode-item img{width:140px;height:140px;border:1px solid #e9ecef;border-radius:8px;padding:8px;background:#fff}
.qrcode-item p{font-size:.8rem;color:#6c757d;margin-top:6px}

/* === Share Bar === */
.share-bar{padding:30px 0;background:#fff;border-top:1px solid #e9ecef}
.share-inner{display:flex;align-items:center;justify-content:center;gap:16px}
.share-inner span{font-size:.9rem;color:#6c757d}
.share-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;color:#fff;font-size:1rem;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* === Footer === */
.site-footer{background:#1a1a2e;color:#adb5bd;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:16px}
.footer-col p{font-size:.88rem;line-height:1.7;margin-bottom:8px}
.footer-col a{display:block;color:#adb5bd;font-size:.88rem;margin-bottom:8px;transition:color .3s}
.footer-col a:hover{color:#40916c}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:.85rem}
.footer-bottom .update-time{color:#6c757d;margin-top:4px;font-size:.8rem}

/* === Page Hero (Inner Pages) === */
.page-hero{background:linear-gradient(135deg,#2d6a4f,#1a1a2e);color:#fff;padding:50px 0;text-align:center}
.page-hero h1{font-size:2.2rem;margin-bottom:10px}
.page-hero p{font-size:1.05rem;color:#adb5bd;max-width:600px;margin:0 auto}

/* === Tag Cloud === */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:20px}
.tag{display:inline-block;background:#e8f5e9;color:#2d6a4f;padding:6px 16px;border-radius:20px;font-size:.85rem;transition:all .3s}
.tag:hover{background:#2d6a4f;color:#fff}

/* === Responsive === */
@media(max-width:992px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .services-grid,.ai-grid,.expert-grid,.reviews-grid{grid-template-columns:repeat(2,1fr)}
  .community-features{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:20px;box-shadow:0 4px 12px rgba(0,0,0,.1)}
  .main-nav.active{display:flex}
  .mobile-toggle{display:block}
  .hero{height:400px}
  .hero-content h1{font-size:1.8rem}
  .video-grid{grid-template-columns:1fr}
  .services-grid,.ai-grid,.reviews-grid{grid-template-columns:1fr}
  .community-features{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .search-box input{width:100px}
  .section-title h2{font-size:1.5rem}
}