/* ============================================
   17c一起草 全站样式表
   品牌色系：糖心粉 #FF6B9D / 深莓红 #C44569 / 暖金 #F8B500
   ydfsee.cn 原创设计
   ============================================ */

/* Reset & Base */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#333;background:#FFF5F7;line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit;transition:color .3s}
a:hover{color:#FF6B9D}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header / Navigation */
.site-header{background:#2D1B30;position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(45,27,48,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:0 20px;max-width:1200px;margin:0 auto;height:68px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:42px;width:auto}
.logo-wrap span{font-size:1.3rem;font-weight:700;color:#FF6B9D;letter-spacing:1px}
.main-nav{display:flex;gap:6px}
.main-nav a{color:#f0e6f2;font-size:.95rem;padding:8px 14px;border-radius:6px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:#FF6B9D;color:#fff}
.mobile-menu-btn{display:none;background:none;border:none;color:#FF6B9D;font-size:1.5rem;cursor:pointer}

/* Search Bar */
.search-bar{background:linear-gradient(135deg,#FF6B9D 0%,#C44569 100%);padding:14px 0}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;width:100%;max-width:600px;border-radius:30px;overflow:hidden;box-shadow:0 4px 16px rgba(196,69,105,.3)}
.search-box input{flex:1;padding:12px 24px;border:none;font-size:1rem;outline:none;background:#fff;color:#333}
.search-box input::placeholder{color:#bbb}
.search-box button{padding:12px 28px;background:#F8B500;border:none;color:#2D1B30;font-weight:600;cursor:pointer;font-size:.95rem;transition:background .3s}
.search-box button:hover{background:#e6a600}

/* Hero Banner */
.hero{position:relative;height:520px;background-size:cover;background-position:center;background-repeat:no-repeat;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(45,27,48,.55) 0%,rgba(196,69,105,.35) 100%)}
.hero-content{position:relative;z-index:2;color:#fff;max-width:800px;padding:0 20px}
.hero-content h1{font-size:2.8rem;font-weight:800;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.4);line-height:1.3}
.hero-content h1 em{font-style:normal;color:#F8B500}
.hero-content p{font-size:1.15rem;margin-bottom:28px;opacity:.95;text-shadow:0 1px 4px rgba(0,0,0,.3)}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 32px;border-radius:30px;font-weight:600;font-size:1rem;transition:all .3s;cursor:pointer;border:none}
.btn-primary{background:#FF6B9D;color:#fff;box-shadow:0 4px 16px rgba(255,107,157,.4)}
.btn-primary:hover{background:#e0558a;transform:translateY(-2px)}
.btn-outline{background:transparent;color:#fff;border:2px solid #fff}
.btn-outline:hover{background:#fff;color:#C44569}

/* Section Common */
.section{padding:60px 0}
.section-alt{background:#fff}
.section-dark{background:#2D1B30;color:#f0e6f2}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;font-weight:700;color:#2D1B30;margin-bottom:10px;position:relative;display:inline-block}
.section-dark .section-title h2{color:#FF6B9D}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#FF6B9D,#F8B500);margin:12px auto 0;border-radius:2px}
.section-title p{color:#888;font-size:1rem;max-width:600px;margin:0 auto}
.section-dark .section-title p{color:#c0b0c5}

/* Video Cards Grid */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(45,27,48,.08);transition:all .3s;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 8px 32px rgba(255,107,157,.18)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{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(255,107,157,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer}
.play-btn::after{content:'';width:0;height:0;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-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.8rem}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;font-weight:600;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.video-meta{display:flex;gap:16px;color:#999;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:#FFF0F3;color:#FF6B9D;padding:2px 10px;border-radius:12px;font-size:.78rem;margin-top:8px}

/* Feature Modules */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:32px 24px;text-align:center;box-shadow:0 4px 16px rgba(45,27,48,.06);transition:all .3s;border:1px solid #f5e8f0}
.feature-card:hover{transform:translateY(-4px);border-color:#FF6B9D;box-shadow:0 8px 24px rgba(255,107,157,.12)}
.feature-icon{width:64px;height:64px;background:linear-gradient(135deg,#FF6B9D,#F8B500);border-radius:16px;display:flex;align-items:center;justify-content:center;margin:0 auto 18px;font-size:1.8rem;color:#fff}
.feature-card h3{font-size:1.1rem;font-weight:600;margin-bottom:10px;color:#2D1B30}
.feature-card p{font-size:.9rem;color:#777;line-height:1.6}

/* Expert Section */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(45,27,48,.06);text-align:center;transition:all .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(255,107,157,.15)}
.expert-avatar{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:24px auto 16px;border:3px solid #FF6B9D}
.expert-card h3{font-size:1.05rem;font-weight:600;color:#2D1B30}
.expert-card .role{color:#FF6B9D;font-size:.88rem;margin:4px 0 8px}
.expert-card p{font-size:.85rem;color:#888;padding:0 16px;margin-bottom:16px}
.expert-links{display:flex;justify-content:center;gap:10px;padding-bottom:20px}
.expert-links a{padding:6px 16px;border-radius:20px;font-size:.82rem;font-weight:500;transition:all .3s}
.expert-links .link-contact{background:#FF6B9D;color:#fff}
.expert-links .link-contact:hover{background:#C44569}
.expert-links .link-work{background:#FFF0F3;color:#FF6B9D;border:1px solid #FF6B9D}
.expert-links .link-work:hover{background:#FF6B9D;color:#fff}

/* Partner Logos */
.partner-grid{display:flex;justify-content:center;align-items:center;gap:40px;flex-wrap:wrap;padding:20px 0}
.partner-grid .partner-item{width:140px;height:70px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 10px rgba(0,0,0,.06);padding:12px;filter:grayscale(.6);opacity:.7;transition:all .3s}
.partner-grid .partner-item:hover{filter:grayscale(0);opacity:1;transform:scale(1.05)}

/* FAQ Section */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 10px rgba(45,27,48,.05);border:1px solid #f5e8f0}
.faq-question{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s;color:#2D1B30}
.faq-question:hover{background:#FFF0F3}
.faq-question::after{content:'+';font-size:1.4rem;color:#FF6B9D;transition:transform .3s;font-weight:300}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#666;font-size:.95rem;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:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(45,27,48,.06);border-left:4px solid #FF6B9D}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#FF6B9D,#F8B500);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;color:#2D1B30}
.review-date{font-size:.82rem;color:#aaa}
.review-stars{color:#F8B500;margin-bottom:8px;font-size:.9rem}
.review-text{color:#666;font-size:.95rem;line-height:1.7}

/* Contact Section */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:40px;align-items:start}
.contact-info{background:#fff;border-radius:12px;padding:32px;box-shadow:0 4px 16px rgba(45,27,48,.06)}
.contact-info h3{font-size:1.2rem;font-weight:600;color:#2D1B30;margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid #FF6B9D}
.contact-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px;font-size:.95rem;color:#555}
.contact-item strong{color:#2D1B30;min-width:80px}
.contact-qr{display:flex;gap:24px;margin-top:20px}
.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 span{font-size:.85rem;color:#888}

/* How-To Guide */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:30px}
.howto-step{text-align:center;position:relative}
.step-num{width:48px;height:48px;background:linear-gradient(135deg,#FF6B9D,#C44569);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.2rem;margin:0 auto 14px}
.howto-step h4{font-size:1rem;font-weight:600;color:#2D1B30;margin-bottom:8px}
.howto-step p{font-size:.88rem;color:#777}

/* Social Share */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;transition:all .3s;cursor:pointer}
.share-btn:hover{transform:translateY(-3px)}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* Footer */
.site-footer{background:#2D1B30;color:#c0b0c5;padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand p{font-size:.9rem;line-height:1.7;margin-top:12px}
.footer-col h4{color:#FF6B9D;font-size:1rem;margin-bottom:16px;font-weight:600}
.footer-col a{display:block;color:#c0b0c5;font-size:.9rem;margin-bottom:10px;transition:color .3s}
.footer-col a:hover{color:#FF6B9D}
.footer-bottom{text-align:center;padding:20px 0;font-size:.85rem;color:#8a7a8e}
.footer-bottom a{color:#FF6B9D}
.update-time{margin-top:6px;font-size:.82rem;color:#7a6a7e}

/* Breadcrumb */
.breadcrumb{padding:12px 0;font-size:.88rem;color:#999}
.breadcrumb a{color:#FF6B9D}
.breadcrumb span{margin:0 6px;color:#ccc}

/* Community Features */
.community-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.community-card{background:linear-gradient(135deg,#fff 0%,#FFF5F7 100%);border-radius:12px;padding:28px;text-align:center;border:1px solid #f5e8f0;transition:all .3s}
.community-card:hover{border-color:#FF6B9D;box-shadow:0 6px 20px rgba(255,107,157,.12)}
.community-icon{font-size:2.2rem;margin-bottom:14px}
.community-card h3{font-size:1.05rem;font-weight:600;color:#2D1B30;margin-bottom:8px}
.community-card p{font-size:.88rem;color:#777}

/* AI Features */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:linear-gradient(135deg,#2D1B30 0%,#4a2d52 100%);border-radius:12px;padding:28px;color:#f0e6f2;transition:all .3s}
.ai-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(45,27,48,.3)}
.ai-card h3{font-size:1.1rem;font-weight:600;color:#F8B500;margin-bottom:10px}
.ai-card p{font-size:.9rem;line-height:1.7;opacity:.85}

/* Responsive */
@media(max-width:1024px){
  .video-grid,.feature-grid,.expert-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){
  .header-inner{height:56px}
  .main-nav{display:none;position:absolute;top:56px;left:0;right:0;background:#2D1B30;flex-direction:column;padding:16px;gap:4px;box-shadow:0 8px 24px rgba(0,0,0,.3)}
  .main-nav.open{display:flex}
  .mobile-menu-btn{display:block}
  .hero{height:380px}
  .hero-content h1{font-size:1.8rem}
  .video-grid,.feature-grid,.expert-grid,.community-grid,.ai-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .video-grid,.feature-grid,.expert-grid,.community-grid,.ai-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .section{padding:40px 0}
  .partner-grid{gap:20px}
  .partner-grid .partner-item{width:100px;height:50px}
}
@media(max-width:480px){
  .hero{height:300px}
  .hero-content h1{font-size:1.5rem}
  .search-box{flex-direction:column;border-radius:12px}
  .search-box button{border-radius:0 0 12px 12px}
  .btn{padding:10px 24px;font-size:.9rem}
}

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

/* Video player overlay */
.video-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.85);z-index:9999;display:none;align-items:center;justify-content:center}
.video-overlay.active{display:flex}
.video-overlay .close-btn{position:absolute;top:20px;right:30px;color:#fff;font-size:2rem;cursor:pointer}
.video-player-wrap{width:90%;max-width:900px;aspect-ratio:16/9;background:#000;border-radius:12px;overflow:hidden;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.2rem}

/* Scroll to top */
.scroll-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:#FF6B9D;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;cursor:pointer;opacity:0;transition:all .3s;z-index:999;box-shadow:0 4px 12px rgba(255,107,157,.4)}
.scroll-top.visible{opacity:1}
.scroll-top:hover{background:#C44569;transform:translateY(-3px)}

/* Tags */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:20px}
.tag-cloud a{background:#FFF0F3;color:#FF6B9D;padding:6px 16px;border-radius:20px;font-size:.85rem;transition:all .3s;border:1px solid transparent}
.tag-cloud a:hover{background:#FF6B9D;color:#fff;border-color:#FF6B9D}

/* Inner page hero */
.page-hero{background:linear-gradient(135deg,#2D1B30 0%,#C44569 100%);padding:48px 0;text-align:center;color:#fff}
.page-hero h1{font-size:2rem;font-weight:700;margin-bottom:8px}
.page-hero p{opacity:.85;font-size:1rem}

/* Content cards for inner pages */
.content-section{padding:40px 0}
.content-card{background:#fff;border-radius:12px;padding:32px;margin-bottom:24px;box-shadow:0 4px 16px rgba(45,27,48,.06)}
.content-card h2{font-size:1.4rem;font-weight:700;color:#2D1B30;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid #FF6B9D}
.content-card h3{font-size:1.15rem;font-weight:600;color:#C44569;margin:16px 0 10px}
.content-card p{color:#555;line-height:1.8;margin-bottom:12px}