/* ============================================
   糖心vlog - 原创样式表
   品牌色系：珊瑚粉 #FF6B81 / 深玫红 #E84393 / 暖橙 #FD9644 / 深紫 #6C5CE7 / 暗底 #1A1A2E
   ============================================ */

/* CSS 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","Hiragino Sans GB",Arial,sans-serif;color:#333;background:#fafafa;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}

/* 品牌色变量 */
:root{
  --primary:#FF6B81;
  --primary-dark:#E84393;
  --accent:#FD9644;
  --purple:#6C5CE7;
  --dark:#1A1A2E;
  --dark2:#16213E;
  --light:#FFF5F5;
  --white:#FFFFFF;
  --gray:#F8F9FA;
  --text:#333333;
  --text-light:#666666;
  --shadow:0 4px 20px rgba(0,0,0,.08);
  --shadow-hover:0 8px 30px rgba(255,107,129,.2);
  --radius:12px;
  --radius-sm:8px;
  --transition:all .3s ease;
}

/* Container */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.container-wide{max-width:1400px;margin:0 auto;padding:0 20px}

/* ============ Header / Navigation ============ */
.site-header{background:var(--dark);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1400px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:42px;width:auto}
.logo-text{font-size:1.4rem;font-weight:800;color:var(--primary);letter-spacing:1px}
.logo-text span{color:var(--accent)}

.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#ddd;padding:12px 16px;font-size:.95rem;font-weight:500;position:relative;transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{color:var(--primary)}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--primary);transition:var(--transition);transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:60%}

.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:5px}
.mobile-toggle span{width:24px;height:2px;background:var(--white);transition:var(--transition)}

/* Search Bar */
.search-bar{background:var(--dark2);padding:12px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.search-bar .container{display:flex;align-items:center;justify-content:center;gap:10px}
.search-input-wrap{position:relative;width:100%;max-width:600px}
.search-input-wrap input{width:100%;padding:10px 45px 10px 18px;border:2px solid rgba(255,107,129,.3);border-radius:25px;background:rgba(255,255,255,.08);color:#fff;font-size:.95rem;outline:none;transition:var(--transition)}
.search-input-wrap input::placeholder{color:rgba(255,255,255,.4)}
.search-input-wrap input:focus{border-color:var(--primary);background:rgba(255,255,255,.12)}
.search-btn{position:absolute;right:5px;top:50%;transform:translateY(-50%);background:var(--primary);border:none;color:#fff;width:34px;height:34px;border-radius:50%;cursor:pointer;font-size:1rem;transition:var(--transition)}
.search-btn:hover{background:var(--primary-dark)}
.search-hot{display:flex;align-items:center;gap:8px;margin-left:15px;font-size:.8rem;color:rgba(255,255,255,.4)}
.search-hot a{color:var(--primary);opacity:.7;transition:var(--transition)}
.search-hot a:hover{opacity:1}

/* ============ Hero Banner ============ */
.hero{position:relative;height:520px;overflow:hidden;background:var(--dark)}
.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(26,26,46,.8) 0%,rgba(232,67,147,.3) 100%)}
.hero-content{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#fff;padding:0 20px}
.hero h1{font-size:3rem;margin-bottom:15px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero p{font-size:1.2rem;opacity:.9;max-width:700px;margin-bottom:30px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:25px}
.hero-tags span{background:rgba(255,107,129,.2);border:1px solid rgba(255,107,129,.4);padding:5px 15px;border-radius:20px;font-size:.85rem;color:var(--primary)}
.hero-btns{display:flex;gap:15px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:25px;font-size:1rem;font-weight:600;cursor:pointer;border:none;transition:var(--transition)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 15px rgba(255,107,129,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 25px rgba(255,107,129,.5)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}

/* ============ Section Common ============ */
.section{padding:60px 0}
.section-dark{background:var(--dark);color:#fff}
.section-gray{background:var(--gray)}
.section-light{background:var(--light)}
.section-header{text-align:center;margin-bottom:45px}
.section-header h2{font-size:2rem;color:var(--dark);margin-bottom:10px}
.section-dark .section-header h2{color:#fff}
.section-header p{color:var(--text-light);font-size:1.05rem;max-width:600px;margin:0 auto}
.section-dark .section-header p{color:rgba(255,255,255,.6)}
.section-header .line{width:60px;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));margin:12px auto 0;border-radius:2px}

/* ============ Video Grid ============ */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#000}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:50px;height:50px;background:rgba(255,107,129,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.video-play-btn::after{content:'';width:0;height:0;border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:3px}
.video-card:hover .video-play-btn{background:var(--primary);transform:translate(-50%,-50%) scale(1.1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.video-info{padding:12px 15px}
.video-info h3{font-size:.95rem;color:var(--dark);margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;justify-content:space-between;font-size:.8rem;color:var(--text-light)}
.video-meta .views{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:rgba(255,107,129,.1);color:var(--primary);padding:2px 8px;border-radius:10px;font-size:.72rem;margin-top:6px}

/* ============ Category Tabs ============ */
.tab-nav{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
.tab-nav .tab-btn{padding:8px 22px;border:2px solid #eee;border-radius:25px;background:transparent;color:var(--text-light);font-size:.9rem;cursor:pointer;transition:var(--transition)}
.tab-nav .tab-btn.active,.tab-nav .tab-btn:hover{border-color:var(--primary);color:var(--primary);background:rgba(255,107,129,.05)}

/* ============ Feature Cards ============ */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:30px 25px;text-align:center;box-shadow:var(--shadow);transition:var(--transition);border:1px solid transparent}
.feature-card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.feature-icon{width:60px;height:60px;margin:0 auto 15px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff}
.feature-card h3{font-size:1.1rem;margin-bottom:8px;color:var(--dark)}
.feature-card p{font-size:.9rem;color:var(--text-light);line-height:1.6}

/* ============ Expert Section ============ */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.expert-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);text-align:center}
.expert-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.expert-avatar{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:25px auto 15px;border:3px solid var(--primary)}
.expert-card h4{font-size:1rem;color:var(--dark);margin-bottom:4px}
.expert-card .role{color:var(--primary);font-size:.85rem;margin-bottom:8px}
.expert-card .desc{font-size:.82rem;color:var(--text-light);padding:0 15px;margin-bottom:15px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.expert-btns{display:flex;gap:8px;justify-content:center;padding:0 15px 20px}
.expert-btns a{padding:6px 14px;border-radius:15px;font-size:.8rem;border:1px solid var(--primary);color:var(--primary);transition:var(--transition)}
.expert-btns a:hover{background:var(--primary);color:#fff}

/* ============ Community Section ============ */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.community-card{position:relative;border-radius:var(--radius);overflow:hidden;height:280px;cursor:pointer}
.community-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.community-card:hover img{transform:scale(1.08)}
.community-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(26,26,46,.8) 0%,transparent 60%);display:flex;flex-direction:column;justify-content:flex-end;padding:20px;color:#fff}
.community-overlay h3{font-size:1.1rem;margin-bottom:5px}
.community-overlay p{font-size:.85rem;opacity:.8}
.live-badge{position:absolute;top:12px;left:12px;background:var(--primary);color:#fff;padding:3px 10px;border-radius:10px;font-size:.75rem;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}

/* ============ Reviews ============ */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.review-card{background:var(--white);border-radius:var(--radius);padding:25px;box-shadow:var(--shadow);transition:var(--transition)}
.review-card:hover{box-shadow:var(--shadow-hover)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:45px;height:45px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;color:var(--dark);font-size:.95rem}
.review-date{font-size:.78rem;color:var(--text-light)}
.review-stars{color:var(--accent);font-size:.9rem;margin-bottom:8px}
.review-text{font-size:.9rem;color:var(--text-light);line-height:1.7}

/* ============ FAQ ============ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius-sm);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-question{padding:18px 20px;font-weight:600;color:var(--dark);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}
.faq-question:hover{color:var(--primary)}
.faq-question .arrow{transition:transform .3s;font-size:.8rem;color:var(--primary)}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 20px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;font-size:.9rem;color:var(--text-light);line-height:1.8}
.faq-item.active .faq-answer{max-height:300px;padding:0 20px 18px}

/* ============ Partners ============ */
.partner-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.partner-item{background:var(--white);padding:15px 25px;border-radius:var(--radius-sm);box-shadow:var(--shadow);font-size:.95rem;font-weight:600;color:var(--text-light);transition:var(--transition)}
.partner-item:hover{color:var(--primary);box-shadow:var(--shadow-hover)}

/* ============ How-To Guide ============ */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.howto-step{background:var(--white);border-radius:var(--radius);padding:25px 20px;text-align:center;box-shadow:var(--shadow);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);width:40px;height:40px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem;margin:0 auto 12px}
.howto-step h4{font-size:1rem;color:var(--dark);margin-bottom:6px}
.howto-step p{font-size:.85rem;color:var(--text-light)}

/* ============ Contact Section ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:25px}
.contact-info-card h3{color:var(--primary);font-size:1.1rem;margin-bottom:15px}
.contact-info-card p{color:rgba(255,255,255,.7);font-size:.9rem;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.contact-qr{display:flex;gap:20px;margin-top:20px}
.contact-qr img{width:130px;height:130px;border-radius:var(--radius-sm);border:2px solid rgba(255,107,129,.3)}
.contact-qr-label{text-align:center;font-size:.8rem;color:rgba(255,255,255,.5);margin-top:5px}

/* ============ Share Buttons ============ */
.share-bar{display:flex;gap:10px;justify-content:center;padding:20px 0}
.share-btn{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1rem;transition:var(--transition);cursor:pointer}
.share-btn:hover{transform:translateY(-3px)}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#000}
.share-bilibili{background:#FB7299}

/* ============ Footer ============ */
.site-footer{background:var(--dark);color:rgba(255,255,255,.6);padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand .logo-wrap{margin-bottom:12px}
.footer-brand p{font-size:.85rem;line-height:1.7}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:15px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--primary)}
.footer-col a{display:block;font-size:.85rem;padding:4px 0;transition:var(--transition)}
.footer-col a:hover{color:var(--primary);padding-left:5px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding:20px 0;font-size:.82rem}
.footer-bottom .update-time{color:var(--primary)}

/* ============ Breadcrumb ============ */
.breadcrumb{padding:12px 0;font-size:.85rem;color:var(--text-light)}
.breadcrumb a{color:var(--primary)}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ============ Inner Page ============ */
.inner-hero{background:var(--dark);padding:50px 0 40px;text-align:center;color:#fff}
.inner-hero h1{font-size:2.2rem;margin-bottom:8px}
.inner-hero p{opacity:.7;font-size:1rem}
.inner-content{padding:40px 0}
.inner-sidebar{position:sticky;top:80px}

/* Video Player Page */
.player-wrap{position:relative;padding-top:56.25%;background:#000;border-radius:var(--radius);overflow:hidden;margin-bottom:25px}
.player-wrap video{position:absolute;inset:0;width:100%;height:100%}
.video-detail-info{background:var(--white);border-radius:var(--radius);padding:25px;box-shadow:var(--shadow);margin-bottom:25px}
.video-detail-info h1{font-size:1.5rem;color:var(--dark);margin-bottom:10px}
.video-detail-meta{display:flex;gap:20px;font-size:.85rem;color:var(--text-light);margin-bottom:15px;flex-wrap:wrap}
.video-detail-meta span{display:flex;align-items:center;gap:4px}
.video-detail-desc{font-size:.95rem;color:var(--text-light);line-height:1.8}
.video-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.video-tags a{background:rgba(255,107,129,.1);color:var(--primary);padding:4px 12px;border-radius:15px;font-size:.8rem;transition:var(--transition)}
.video-tags a:hover{background:var(--primary);color:#fff}

/* Related Videos */
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}

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

/* ============ Scroll to Top ============ */
.scroll-top{position:fixed;bottom:30px;right:30px;width:45px;height:45px;background:var(--primary);color:#fff;border:none;border-radius:50%;font-size:1.2rem;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition);z-index:999;box-shadow:0 4px 15px rgba(255,107,129,.4)}
.scroll-top.show{opacity:1;visibility:visible}
.scroll-top:hover{background:var(--primary-dark);transform:translateY(-3px)}

/* ============ Responsive ============ */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--dark);flex-direction:column;padding:15px 0;box-shadow:0 5px 20px rgba(0,0,0,.3)}
  .main-nav.open{display:flex}
  .mobile-toggle{display:flex}
  .hero h1{font-size:2rem}
  .hero p{font-size:1rem}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .community-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .search-hot{display:none}
  .hero{height:400px}
  .section{padding:40px 0}
  .section-header h2{font-size:1.6rem}
  .howto-steps{grid-template-columns:1fr}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .community-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .hero h1{font-size:1.6rem}
  .hero{height:350px}
  .hero-btns{flex-direction:column;align-items:center}
  .contact-qr{flex-direction:column;align-items:center}
}