/* ========================================
   糖心vlog 全站样式表
   品牌色：#E8456B / #FF7E5F / #1A1A2E
   ======================================== */

/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#333;background:#FFF5F7;line-height:1.7}
a{color:#E8456B;text-decoration:none;transition:color .3s}
a:hover{color:#FF7E5F}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;color:#1A1A2E;line-height:1.3}

/* Container */
.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,.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1200px;margin:0 auto}
.logo-link{display:flex;align-items:center;gap:10px}
.logo-link img{height:40px;width:auto}
.logo-text{color:#fff;font-size:1.25rem;font-weight:700}

/* Navigation */
.main-nav ul{display:flex;gap:6px}
.main-nav a{color:#ddd;padding:8px 16px;border-radius:6px;font-size:.95rem;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#fff;background:linear-gradient(135deg,#E8456B,#FF7E5F)}
.mobile-menu-btn{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* Search Bar */
.search-bar{background:linear-gradient(135deg,#E8456B,#FF7E5F);padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;background:#fff;border-radius:30px;overflow:hidden;box-shadow:0 2px 8px rgba(232,69,107,.2)}
.search-form input{flex:1;border:none;padding:10px 20px;font-size:.95rem;outline:none;background:transparent}
.search-form button{background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;border:none;padding:10px 24px;cursor:pointer;font-size:.95rem;transition:opacity .3s}
.search-form button:hover{opacity:.85}

/* ========== Hero ========== */
.hero-section{position:relative;height:520px;background:url('../images/hero-bg.jpg') center/cover no-repeat;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero-section::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(26,26,46,.7),rgba(232,69,107,.4))}
.hero-content{position:relative;z-index:2;color:#fff;max-width:700px;padding:0 20px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.hero-content p{font-size:1.15rem;margin-bottom:24px;opacity:.95}
.hero-btn{display:inline-block;background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;padding:14px 36px;border-radius:30px;font-size:1.05rem;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(232,69,107,.4);color:#fff}

/* ========== Section Common ========== */
.section{padding:60px 0}
.section-alt{background:#fff}
.section-dark{background:#1A1A2E;color:#fff}
.section-dark h2,.section-dark h3{color:#fff}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(135deg,#E8456B,#FF7E5F);margin:10px auto 0;border-radius:2px}
.section-title p{color:#666;font-size:1rem;margin-top:8px}

/* ========== Video Cards ========== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(232,69,107,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;cursor:pointer}
.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:60px;height:60px;background:rgba(232,69,107,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-thumb:hover .play-btn{opacity:1}
.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-info{padding:16px}
.video-info h3{font-size:1.05rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:16px;color:#999;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.video-tags span{background:#FFF0F3;color:#E8456B;padding:2px 10px;border-radius:12px;font-size:.78rem}

/* ========== Feature Modules ========== */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:30px 24px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.05);transition:transform .3s}
.feature-card:hover{transform:translateY(-4px)}
.feature-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#E8456B,#FF7E5F);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff}
.feature-card h3{font-size:1.1rem;margin-bottom:8px}
.feature-card p{color:#666;font-size:.9rem;line-height:1.6}

/* ========== Expert Section ========== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);text-align:center;padding:30px 20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;object-fit:cover;border:3px solid #E8456B}
.expert-card h3{font-size:1.1rem;margin-bottom:4px}
.expert-card .title{color:#E8456B;font-size:.85rem;margin-bottom:8px}
.expert-card p{color:#666;font-size:.88rem;line-height:1.6;margin-bottom:12px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;border-radius:20px;font-size:.82rem;border:1px solid #E8456B;color:#E8456B;transition:all .3s}
.btn-sm:hover{background:#E8456B;color:#fff}
.btn-sm.filled{background:linear-gradient(135deg,#E8456B,#FF7E5F);color:#fff;border-color:transparent}

/* ========== Partners ========== */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-wall img{height:60px;width:auto;opacity:.7;transition:opacity .3s;filter:grayscale(30%)}
.partner-wall img:hover{opacity:1;filter:none}

/* ========== Reviews ========== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.05)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-header img{width:48px;height:48px;border-radius:50%;object-fit:cover}
.review-header .name{font-weight:600;font-size:.95rem}
.review-header .date{color:#999;font-size:.8rem}
.review-stars{color:#FFD700;margin-bottom:8px;font-size:.9rem}
.review-card p{color:#555;font-size:.9rem;line-height:1.7}

/* ========== FAQ ========== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.faq-question{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-question:hover{background:#FFF0F3}
.faq-question::after{content:'+';font-size:1.3rem;color:#E8456B;transition:transform .3s}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;color:#666;font-size:.92rem;line-height:1.7}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}

/* ========== Contact ========== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:12px;padding:24px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.05)}
.contact-card h3{font-size:1.05rem;margin-bottom:12px;color:#E8456B}
.contact-card p{color:#666;font-size:.9rem;line-height:1.8}
.contact-card img{max-width:160px;margin:12px auto 0;border-radius:8px}

/* ========== How-To Guide ========== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;margin-top:30px}
.howto-step{text-align:center;padding:24px}
.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:1.3rem;font-weight:700;margin:0 auto 14px}
.howto-step h4{margin-bottom:8px;font-size:1rem}
.howto-step p{color:#666;font-size:.88rem}

/* ========== Share Buttons ========== */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;transition:opacity .3s}
.share-btn:hover{opacity:.85;color:#fff}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00A1D6}

/* ========== Footer ========== */
.site-footer{background:#1A1A2E;color:#ccc;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.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:linear-gradient(135deg,#E8456B,#FF7E5F)}
.footer-col p,.footer-col a{color:#aaa;font-size:.88rem;line-height:1.8}
.footer-col a:hover{color:#E8456B}
.footer-col img{max-width:120px;border-radius:6px;margin-top:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:.85rem;color:#888}
.footer-bottom a{color:#E8456B}

/* ========== Breadcrumb ========== */
.breadcrumb{padding:14px 0;font-size:.88rem;color:#999}
.breadcrumb a{color:#E8456B}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ========== Inner Page ========== */
.page-hero{background:linear-gradient(135deg,#1A1A2E,#E8456B);padding:60px 0;text-align:center;color:#fff}
.page-hero h1{font-size:2.2rem;color:#fff;margin-bottom:10px}
.page-hero p{opacity:.9;font-size:1rem}
.content-section{padding:40px 0}
.content-section h2{font-size:1.6rem;margin-bottom:20px;color:#1A1A2E}
.content-section p{color:#555;line-height:1.8;margin-bottom:16px}

/* ========== Responsive ========== */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;order:3}
  .main-nav.active{display:block}
  .main-nav ul{flex-direction:column;padding:10px 0}
  .main-nav a{display:block;padding:10px 16px}
  .mobile-menu-btn{display:block}
  .hero-section{height:400px}
  .hero-content h1{font-size:1.8rem}
  .video-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr 1fr}
  .expert-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
}
@media(max-width:480px){
  .feature-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .search-form{flex-direction:column;border-radius:12px}
  .search-form button{border-radius:0 0 12px 12px}
}