/* ============================================
   糖心vlog 全站样式表 - 原创设计
   品牌色系：糖心粉红 + 暖橘渐变
   ============================================ */

/* 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","Hiragino Sans GB",Arial,sans-serif;color:#333;background:#FFF5F7;line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit;transition:color .3s}
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}

/* ============ 导航栏 ============ */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(26,26,46,.95);backdrop-filter:blur(12px);box-shadow:0 2px 20px rgba(0,0,0,.15);transition:all .3s}
.header-inner{max-width:1400px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 24px;height:68px}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:42px;width:auto;border-radius:6px}
.site-logo span{color:#fff;font-size:20px;font-weight:700;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{color:rgba(255,255,255,.85);font-size:14px;padding:8px 14px;border-radius:6px;transition:all .3s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{color:#fff;background:linear-gradient(135deg,#E8456B,#FF7E5F);box-shadow:0 2px 12px rgba(232,69,107,.4)}
.nav-search{position:relative;margin-left:12px}
.nav-search input{width:180px;height:36px;border:1px solid rgba(255,255,255,.2);border-radius:18px;background:rgba(255,255,255,.1);color:#fff;padding:0 36px 0 14px;font-size:13px;transition:all .3s;outline:none}
.nav-search input::placeholder{color:rgba(255,255,255,.5)}
.nav-search input:focus{border-color:#E8456B;background:rgba(255,255,255,.15);width:220px}
.nav-search .search-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;color:rgba(255,255,255,.7);cursor:pointer;font-size:16px}
.mobile-toggle{display:none;background:none;border:none;color:#fff;font-size:24px;cursor:pointer}

/* ============ Hero Banner ============ */
.hero-section{position:relative;width:100%;min-height:600px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.6)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(232,69,107,.7),rgba(255,126,95,.5))}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;padding:40px 24px;max-width:800px}
.hero-content h1{font-size:48px;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.3)}
.hero-content h1 em{font-style:normal;color:#FFD700}
.hero-content p{font-size:18px;opacity:.95;margin-bottom:32px;line-height:1.8}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:28px}
.hero-tags span{background:rgba(255,255,255,.15);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.25);padding:6px 16px;border-radius:20px;font-size:13px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;padding:14px 36px;border-radius:30px;font-size:16px;font-weight:600;border:none;cursor:pointer;transition:all .3s;box-shadow:0 4px 20px rgba(232,69,107,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(232,69,107,.6)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;background:transparent;color:#fff;padding:14px 36px;border-radius:30px;font-size:16px;font-weight:600;border:2px solid rgba(255,255,255,.5);cursor:pointer;transition:all .3s}
.btn-outline:hover{background:rgba(255,255,255,.15);border-color:#fff}

/* ============ 面包屑 ============ */
.breadcrumb{max-width:1400px;margin:0 auto;padding:16px 24px;font-size:13px;color:#999}
.breadcrumb a{color:#E8456B}
.breadcrumb a:hover{text-decoration:underline}

/* ============ 通用Section ============ */
.section{padding:72px 24px;max-width:1400px;margin:0 auto}
.section-dark{background:#1A1A2E;color:#fff}
.section-alt{background:#fff}
.section-gradient{background:linear-gradient(180deg,#FFF5F7,#fff)}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:36px;margin-bottom:12px;position:relative;display:inline-block}
.section-title h2::after{content:'';position:absolute;bottom:-8px;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#E8456B,#FF7E5F);border-radius:2px}
.section-title p{color:#666;font-size:16px;margin-top:16px;max-width:600px;margin-left:auto;margin-right:auto}
.section-dark .section-title p{color:rgba(255,255,255,.7)}

/* ============ 视频卡片网格 ============ */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s;cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(232,69,107,.15)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:52px;height:52px;background:rgba(232,69,107,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-card:hover .play-icon{opacity:1}
.play-icon::after{content:'';border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}
.video-card .card-body{padding:16px}
.video-card .card-title{font-size:15px;font-weight:600;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:#999}
.video-card .card-meta span{display:flex;align-items:center;gap:4px}
.video-card .card-tag{position:absolute;top:12px;left:12px;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;font-size:11px;padding:3px 10px;border-radius:4px;z-index:2}

/* ============ 服务模块 ============ */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.service-card{background:#fff;border-radius:16px;padding:36px 28px;text-align:center;box-shadow:0 4px 24px rgba(0,0,0,.05);transition:all .3s;border:1px solid rgba(232,69,107,.08)}
.service-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(232,69,107,.12);border-color:rgba(232,69,107,.2)}
.service-icon{width:72px;height:72px;margin:0 auto 20px;background:linear-gradient(135deg,rgba(232,69,107,.1),rgba(255,126,95,.1));border-radius:20px;display:flex;align-items:center;justify-content:center;font-size:32px}
.service-card h3{font-size:20px;margin-bottom:12px;color:#1A1A2E}
.service-card p{font-size:14px;color:#666;line-height:1.8}

/* ============ AI赋能 ============ */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.ai-card{background:linear-gradient(135deg,#1A1A2E,#2D2D4E);border-radius:16px;padding:36px 28px;color:#fff;position:relative;overflow:hidden;transition:all .3s}
.ai-card::before{content:'';position:absolute;top:-50%;right:-50%;width:100%;height:100%;background:radial-gradient(circle,rgba(232,69,107,.15),transparent);transition:all .5s}
.ai-card:hover::before{top:-30%;right:-30%}
.ai-card:hover{transform:translateY(-4px)}
.ai-card h3{font-size:20px;margin-bottom:12px;position:relative;z-index:1}
.ai-card p{font-size:14px;opacity:.8;line-height:1.8;position:relative;z-index:1}
.ai-icon{font-size:36px;margin-bottom:16px;display:block;position:relative;z-index:1}

/* ============ 专家团队 ============ */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.expert-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s;text-align:center}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(232,69,107,.12)}
.expert-card .avatar{width:100%;aspect-ratio:3/4;object-fit:cover}
.expert-card .expert-info{padding:20px 16px}
.expert-card h4{font-size:18px;margin-bottom:4px}
.expert-card .role{color:#E8456B;font-size:13px;margin-bottom:8px}
.expert-card .desc{font-size:13px;color:#666;line-height:1.6;margin-bottom:12px}
.expert-card .expert-btns{display:flex;gap:8px;justify-content:center}
.expert-card .expert-btns a{font-size:12px;padding:6px 14px;border-radius:16px;border:1px solid #E8456B;color:#E8456B;transition:all .3s}
.expert-card .expert-btns a:hover{background:#E8456B;color:#fff}

/* ============ 用户评价 ============ */
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.review-card{background:#fff;border-radius:12px;padding:28px 24px;box-shadow:0 4px 16px rgba(0,0,0,.05);transition:all .3s;border-left:3px solid #E8456B}
.review-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(232,69,107,.1)}
.review-stars{color:#FFD700;font-size:14px;margin-bottom:12px;letter-spacing:2px}
.review-text{font-size:14px;color:#555;line-height:1.8;margin-bottom:16px;font-style:italic}
.review-author{display:flex;align-items:center;gap:10px}
.review-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#E8456B,#FF7E5F);display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:600}
.review-name{font-size:13px;font-weight:600}
.review-date{font-size:11px;color:#999}

/* ============ FAQ ============ */
.faq-list{max-width:900px;margin:0 auto}
.faq-item{background:#fff;border-radius:12px;margin-bottom:12px;box-shadow:0 2px 12px rgba(0,0,0,.04);overflow:hidden}
.faq-question{padding:20px 24px;font-size:16px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:all .3s}
.faq-question:hover{color:#E8456B}
.faq-question .arrow{transition:transform .3s;font-size:20px;color:#E8456B}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;font-size:14px;color:#666;line-height:1.8}
.faq-item.active .faq-answer{padding:0 24px 20px;max-height:500px}

/* ============ 合作品牌 ============ */
.partner-section{text-align:center}
.partner-wall{max-width:900px;margin:0 auto;border-radius:16px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.06)}
.partner-wall img{width:100%}

/* ============ 联系我们 ============ */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:36px;align-items:start}
.contact-info{background:#fff;border-radius:16px;padding:36px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.contact-info h3{font-size:22px;margin-bottom:20px;color:#1A1A2E}
.contact-item{display:flex;align-items:flex-start;gap:14px;margin-bottom:18px;font-size:14px}
.contact-icon{width:40px;height:40px;background:linear-gradient(135deg,rgba(232,69,107,.1),rgba(255,126,95,.1));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.contact-qr{display:flex;gap:24px;margin-top:24px}
.contact-qr .qr-item{text-align:center}
.contact-qr .qr-item img{width:140px;height:140px;border-radius:8px;margin-bottom:8px}
.contact-qr .qr-item p{font-size:12px;color:#666}

/* ============ 社区入口 ============ */
.community-entry{background:#fff;border-radius:16px;padding:36px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.community-links{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px}
.community-link{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(135deg,rgba(232,69,107,.05),rgba(255,126,95,.05));border-radius:10px;font-size:14px;transition:all .3s}
.community-link:hover{background:linear-gradient(135deg,rgba(232,69,107,.12),rgba(255,126,95,.12));transform:translateX(4px)}

/* ============ 社交分享 ============ */
.share-bar{display:flex;align-items:center;gap:12px;justify-content:center;padding:24px;flex-wrap:wrap}
.share-bar span{font-size:14px;color:#666}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:13px;color:#fff;transition:all .3s;cursor:pointer}
.share-btn:hover{transform:translateY(-2px);opacity:.9}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* ============ How-To指南 ============ */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:32px}
.howto-step{text-align:center;padding:28px 20px;background:#fff;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,.04);position:relative}
.step-num{width:48px;height:48px;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;margin:0 auto 16px}
.howto-step h4{font-size:16px;margin-bottom:8px}
.howto-step p{font-size:13px;color:#666;line-height:1.7}

/* ============ 页脚 ============ */
.site-footer{background:#1A1A2E;color:rgba(255,255,255,.8);padding:60px 24px 0}
.footer-inner{max-width:1400px;margin:0 auto}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand{display:flex;flex-direction:column;gap:16px}
.footer-brand .logo-row{display:flex;align-items:center;gap:10px}
.footer-brand .logo-row img{height:40px;border-radius:6px}
.footer-brand .logo-row span{font-size:20px;font-weight:700;color:#fff}
.footer-brand p{font-size:13px;opacity:.7;line-height:1.8}
.footer-col h5{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col a{display:block;font-size:13px;opacity:.7;margin-bottom:10px;transition:all .3s}
.footer-col a:hover{opacity:1;color:#E8456B;padding-left:4px}
.footer-qr{display:flex;gap:16px;margin-top:16px}
.footer-qr img{width:100px;height:100px;border-radius:6px}
.footer-bottom{padding:20px 0;text-align:center;font-size:12px;opacity:.6}
.footer-bottom a{color:#E8456B;opacity:1}

/* ============ 内页通用 ============ */
.page-hero{margin-top:68px;padding:60px 24px;text-align:center;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff}
.page-hero h1{font-size:36px;margin-bottom:12px}
.page-hero p{font-size:16px;opacity:.9}
.page-content{max-width:1200px;margin:0 auto;padding:48px 24px}
.page-content h2{font-size:28px;margin-bottom:20px;color:#1A1A2E}
.page-content h3{font-size:22px;margin:28px 0 14px;color:#1A1A2E}
.page-content p{font-size:15px;color:#555;line-height:1.9;margin-bottom:16px}

/* ============ 视频播放页 ============ */
.video-player-wrap{max-width:960px;margin:0 auto;background:#000;border-radius:12px;overflow:hidden;box-shadow:0 8px 40px rgba(0,0,0,.2)}
.video-player-wrap video{width:100%;display:block}
.video-detail{max-width:960px;margin:24px auto 0;padding:0 24px}
.video-detail h1{font-size:24px;margin-bottom:12px}
.video-detail .meta{display:flex;gap:20px;font-size:13px;color:#999;margin-bottom:20px;flex-wrap:wrap}
.video-detail .desc{font-size:15px;color:#555;line-height:1.9}
.related-videos{margin-top:48px}
.related-videos h3{font-size:22px;margin-bottom:24px}

/* ============ 懒加载 ============ */
.lazy{opacity:0;transition:opacity .5s}
.lazy.loaded{opacity:1}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .main-nav{display:none;position:fixed;top:68px;left:0;width:100%;background:#1A1A2E;flex-direction:column;padding:16px;gap:4px;box-shadow:0 8px 24px rgba(0,0,0,.2)}
  .main-nav.open{display:flex}
  .main-nav a{width:100%;text-align:center;padding:12px}
  .mobile-toggle{display:block}
  .nav-search{display:none}
  .hero-content h1{font-size:32px}
  .hero-content p{font-size:15px}
  .video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .service-grid{grid-template-columns:1fr}
  .ai-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:24px}
  .section{padding:48px 16px}
  .section-title h2{font-size:28px}
  .howto-steps{grid-template-columns:1fr}
  .community-links{grid-template-columns:1fr}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .hero-content h1{font-size:26px}
  .btn-primary,.btn-outline{padding:12px 24px;font-size:14px}
}