/* 糖心视频社区 - 全站样式 */
/* 原创设计 - uafLcb.cn */

/* ===== CSS 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;background:#0f0f1a;color:#e0e0ee;line-height:1.7;overflow-x:hidden}
a{color:#f5a623;text-decoration:none;transition:color .3s}
a:hover{color:#e94560}
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:#fff}

/* ===== Layout ===== */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:#fff;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:linear-gradient(90deg,#e94560,#f5a623);margin:12px auto 0}
.section-title p{color:#8a8aa0;font-size:1rem;margin-top:8px}

/* ===== Header & Nav ===== */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,15,26,.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(233,69,96,.15);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1200px;margin:0 auto;padding:0 20px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:42px;width:auto}
.logo span{font-size:1.4rem;font-weight:800;color:#fff;letter-spacing:1px}
.nav-list{display:flex;gap:28px;align-items:center}
.nav-list a{color:#c0c0d0;font-size:.95rem;font-weight:500;padding:6px 0;position:relative;transition:color .3s}
.nav-list a::after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:#e94560;transition:width .3s}
.nav-list a:hover,.nav-list a.active{color:#fff}
.nav-list a:hover::after,.nav-list a.active::after{width:100%}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:5px}
.mobile-toggle span{display:block;width:24px;height:2px;background:#fff;transition:all .3s}

/* ===== Search Bar ===== */
.search-bar{background:rgba(26,26,46,.8);padding:16px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.search-wrap{max-width:600px;margin:0 auto;display:flex;gap:0;border-radius:30px;overflow:hidden;border:1px solid rgba(233,69,96,.3)}
.search-wrap input{flex:1;padding:12px 20px;background:rgba(255,255,255,.05);border:none;color:#fff;font-size:.95rem;outline:none}
.search-wrap input::placeholder{color:#666}
.search-wrap button{padding:12px 28px;background:linear-gradient(135deg,#e94560,#c0392b);color:#fff;border:none;cursor:pointer;font-size:.95rem;font-weight:600;transition:opacity .3s}
.search-wrap button:hover{opacity:.85}

/* ===== Banner ===== */
.banner{position:relative;height:85vh;min-height:500px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.banner-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat}
.banner-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,15,26,.6) 0%,rgba(15,15,26,.85) 100%)}
.banner-content{position:relative;z-index:2;text-align:center;max-width:800px;padding:0 20px}
.banner-content h1{font-size:3.2rem;font-weight:900;margin-bottom:16px;background:linear-gradient(135deg,#fff 0%,#f5a623 50%,#e94560 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.banner-content .subtitle{font-size:1.3rem;color:#c0c0d0;margin-bottom:24px;line-height:1.6}
.banner-content .desc{font-size:1rem;color:#8a8aa0;margin-bottom:32px}
.banner-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#e94560,#c0392b);color:#fff;border-radius:30px;font-weight:600;font-size:1rem;transition:transform .3s,box-shadow .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(233,69,96,.4);color:#fff}
.btn-outline{display:inline-block;padding:14px 36px;border:2px solid #f5a623;color:#f5a623;border-radius:30px;font-weight:600;font-size:1rem;transition:all .3s;background:transparent;cursor:pointer}
.btn-outline:hover{background:#f5a623;color:#0f0f1a}

/* ===== Video Cards ===== */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#1a1a2e;transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(233,69,96,.2)}
.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)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(233,69,96,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;z-index:2}
.video-card:hover .video-play-btn{opacity:1}
.video-play-btn::after{content:"";display:block;width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:.8rem;z-index:2}
.video-info{padding:16px}
.video-info h3{font-size:1rem;color:#fff;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:16px;color:#8a8aa0;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:3px 10px;background:rgba(233,69,96,.15);color:#e94560;border-radius:20px;font-size:.75rem;margin-top:8px}

/* ===== Entertainment / Short Video ===== */
.short-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.short-card{position:relative;border-radius:12px;overflow:hidden;padding-top:160%;background:#1a1a2e;cursor:pointer;transition:transform .3s}
.short-card:hover{transform:translateY(-4px)}
.short-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.short-card .short-overlay{position:absolute;bottom:0;left:0;right:0;padding:16px;background:linear-gradient(transparent,rgba(0,0,0,.85));z-index:2}
.short-card .short-overlay h4{color:#fff;font-size:.9rem;margin-bottom:4px}
.short-card .short-overlay span{color:#aaa;font-size:.8rem}
.short-card .video-play-btn{width:48px;height:48px}

/* ===== AI Feature ===== */
.ai-section{background:linear-gradient(135deg,rgba(26,26,46,.95),rgba(15,15,26,.98));position:relative;overflow:hidden}
.ai-section::before{content:"";position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(233,69,96,.08),transparent 70%);border-radius:50%}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.ai-content h3{font-size:1.6rem;color:#fff;margin-bottom:16px}
.ai-content p{color:#8a8aa0;margin-bottom:20px;line-height:1.8}
.ai-features{display:flex;flex-direction:column;gap:16px}
.ai-feat-item{display:flex;gap:14px;align-items:flex-start;padding:16px;background:rgba(255,255,255,.03);border-radius:10px;border:1px solid rgba(255,255,255,.05);transition:border-color .3s}
.ai-feat-item:hover{border-color:rgba(233,69,96,.3)}
.ai-feat-icon{width:44px;height:44px;border-radius:10px;background:linear-gradient(135deg,#e94560,#f5a623);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:1.2rem;color:#fff}
.ai-feat-text h4{color:#fff;font-size:1rem;margin-bottom:4px}
.ai-feat-text p{color:#8a8aa0;font-size:.9rem;margin:0}
.ai-image{border-radius:12px;overflow:hidden;box-shadow:0 20px 50px rgba(0,0,0,.3)}
.ai-image img{width:100%;display:block}

/* ===== Community ===== */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{background:#1a1a2e;border-radius:12px;padding:28px;text-align:center;border:1px solid rgba(255,255,255,.05);transition:all .3s}
.community-card:hover{border-color:rgba(233,69,96,.3);transform:translateY(-4px)}
.community-icon{width:56px;height:56px;margin:0 auto 16px;border-radius:14px;background:linear-gradient(135deg,#e94560,#f5a623);display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff}
.community-card h3{font-size:1.1rem;color:#fff;margin-bottom:8px}
.community-card p{color:#8a8aa0;font-size:.9rem}
.community-stat{margin-top:12px;color:#f5a623;font-weight:600;font-size:.9rem}

/* ===== Expert Team ===== */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#1a1a2e;border-radius:12px;overflow:hidden;text-align:center;border:1px solid rgba(255,255,255,.05);transition:all .3s}
.expert-card:hover{border-color:rgba(233,69,96,.3);transform:translateY(-4px)}
.expert-avatar{width:100%;aspect-ratio:1;overflow:hidden}
.expert-avatar img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.expert-card:hover .expert-avatar img{transform:scale(1.05)}
.expert-info{padding:20px}
.expert-info h3{font-size:1.1rem;color:#fff;margin-bottom:4px}
.expert-info .role{color:#f5a623;font-size:.85rem;margin-bottom:8px}
.expert-info p{color:#8a8aa0;font-size:.85rem;margin-bottom:12px}
.expert-links{display:flex;gap:8px;justify-content:center}
.expert-links a{padding:6px 14px;border-radius:20px;font-size:.8rem;border:1px solid rgba(233,69,96,.3);color:#e94560;transition:all .3s}
.expert-links a:hover{background:#e94560;color:#fff}

/* ===== Partner Brands ===== */
.partner-wall{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center}
.partner-item{background:rgba(255,255,255,.05);border-radius:10px;padding:20px 30px;border:1px solid rgba(255,255,255,.08);transition:all .3s;min-width:140px;text-align:center}
.partner-item:hover{border-color:rgba(245,166,35,.3);background:rgba(255,255,255,.08)}
.partner-item span{color:#c0c0d0;font-weight:600;font-size:1rem}

/* ===== How-To Guide ===== */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:30px}
.howto-step{text-align:center;padding:24px;background:#1a1a2e;border-radius:12px;border:1px solid rgba(255,255,255,.05)}
.step-num{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#e94560,#f5a623);display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:1.2rem;font-weight:800;color:#fff}
.howto-step h4{color:#fff;margin-bottom:8px;font-size:1rem}
.howto-step p{color:#8a8aa0;font-size:.9rem}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#1a1a2e;border-radius:10px;margin-bottom:12px;border:1px solid rgba(255,255,255,.05);overflow:hidden}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#fff;transition:background .3s}
.faq-question:hover{background:rgba(233,69,96,.05)}
.faq-question .arrow{transition:transform .3s;color:#f5a623;font-size:1.2rem}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s;color:#8a8aa0;line-height:1.8}
.faq-item.active .faq-answer{padding:0 24px 18px;max-height:500px}

/* ===== Reviews ===== */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:#1a1a2e;border-radius:12px;padding:24px;border:1px solid rgba(255,255,255,.05)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#e94560,#f5a623);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem;flex-shrink:0}
.review-user h4{color:#fff;font-size:1rem;margin-bottom:2px}
.review-user span{color:#8a8aa0;font-size:.85rem}
.review-stars{color:#f5a623;margin-bottom:10px;font-size:.9rem;letter-spacing:2px}
.review-text{color:#b0b0c0;font-size:.95rem;line-height:1.7}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.contact-card{background:#1a1a2e;border-radius:12px;padding:28px;text-align:center;border:1px solid rgba(255,255,255,.05)}
.contact-card h3{color:#fff;margin-bottom:12px;font-size:1.1rem}
.contact-card p{color:#8a8aa0;font-size:.9rem;margin-bottom:8px}
.contact-card .highlight{color:#f5a623;font-weight:600}

/* ===== Share Buttons ===== */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-btn{padding:10px 20px;border-radius:25px;font-size:.9rem;font-weight:500;color:#fff;border:none;cursor:pointer;transition:all .3s}
.share-btn.wechat{background:#07c160}
.share-btn.weibo{background:#e6162d}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#fb7299}
.share-btn:hover{transform:translateY(-2px);opacity:.9}

/* ===== Footer ===== */
.site-footer{background:#0a0a14;border-top:1px solid rgba(255,255,255,.05);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-brand .logo{margin-bottom:14px}
.footer-brand p{color:#8a8aa0;font-size:.9rem;line-height:1.7}
.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:2px;background:#e94560}
.footer-col a{display:block;color:#8a8aa0;font-size:.9rem;padding:4px 0;transition:color .3s}
.footer-col a:hover{color:#f5a623}
.footer-qr{display:flex;gap:20px;margin-top:20px}
.footer-qr-item{text-align:center}
.footer-qr-item img{width:100px;height:100px;border-radius:8px;margin-bottom:6px}
.footer-qr-item span{color:#8a8aa0;font-size:.8rem}
.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding-top:20px;text-align:center;color:#666;font-size:.85rem}
.footer-bottom a{color:#8a8aa0}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:14px 0;font-size:.9rem;color:#8a8aa0}
.breadcrumb a{color:#f5a623}
.breadcrumb span{margin:0 8px;color:#555}

/* ===== Inner Page Hero ===== */
.page-hero{padding:100px 0 40px;text-align:center;background:linear-gradient(180deg,rgba(26,26,46,.95),rgba(15,15,26,1));margin-top:68px}
.page-hero h1{font-size:2.4rem;margin-bottom:10px}
.page-hero p{color:#8a8aa0;font-size:1.05rem}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .video-grid,.community-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .short-video-grid{grid-template-columns:repeat(2,1fr)}
  .ai-grid{grid-template-columns: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){
  .banner{height:70vh;min-height:400px}
  .banner-content h1{font-size:2rem}
  .banner-content .subtitle{font-size:1.05rem}
  .nav-list{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(15,15,26,.98);flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid rgba(233,69,96,.15)}
  .nav-list.open{display:flex}
  .mobile-toggle{display:flex}
  .video-grid{grid-template-columns:1fr}
  .short-video-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.6rem}
  .howto-steps{grid-template-columns:1fr}
}
@media(max-width:480px){
  .short-video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .banner-content h1{font-size:1.6rem}
  .banner-btns{flex-direction:column;align-items:center}
}

/* ===== Lazy Load ===== */
img[loading="lazy"]{opacity:0;transition:opacity .5s}
img.loaded,img[loading="lazy"].loaded{opacity:1}

/* ===== Animations ===== */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s,transform .6s}
.fade-in.visible{opacity:1;transform:translateY(0)}