/* ============================================
   瓜老师 - 原创样式表
   品牌色系：珊瑚粉 #FF6B8A / 薰衣紫 #9B59B6 / 暖白 #FFF5F7
   ============================================ */

/* 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","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#2d2d3a;background:#FFF5F7;line-height:1.7;overflow-x:hidden}
a{color:#FF6B8A;text-decoration:none;transition:color .3s}
a:hover{color:#9B59B6}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;color:#2d2d3a;line-height:1.3}

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

/* ---- Header / Navigation ---- */
.site-header{background:linear-gradient(135deg,#fff 0%,#FFF5F7 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(155,89,182,.08);border-bottom:1px solid rgba(255,107,138,.1)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.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;background:linear-gradient(135deg,#FF6B8A,#9B59B6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{padding:8px 16px;border-radius:20px;font-size:.95rem;color:#555;font-weight:500;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:linear-gradient(135deg,#FF6B8A,#9B59B6);color:#fff;-webkit-text-fill-color:#fff}
.mobile-toggle{display:none;background:none;border:none;font-size:1.5rem;color:#FF6B8A;cursor:pointer}

/* Search Bar */
.search-bar{background:linear-gradient(135deg,#FF6B8A 0%,#9B59B6 100%);padding:14px 0}
.search-wrap{display:flex;justify-content:center;align-items:center;gap:10px}
.search-wrap input{width:480px;max-width:70vw;padding:10px 20px;border:none;border-radius:25px;font-size:1rem;outline:none;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.1)}
.search-wrap button{padding:10px 28px;border:none;border-radius:25px;background:#fff;color:#FF6B8A;font-weight:700;font-size:1rem;cursor:pointer;transition:all .3s}
.search-wrap button:hover{background:#2d2d3a;color:#fff}

/* ---- Hero Banner ---- */
.hero{position:relative;overflow:hidden;border-radius:0 0 30px 30px;margin-bottom:40px}
.hero-bg{width:100%;height:480px;object-fit:cover;filter:brightness(.85)}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:linear-gradient(180deg,rgba(45,45,58,.2) 0%,rgba(155,89,182,.4) 100%);padding:20px}
.hero h1{font-size:2.8rem;color:#fff;text-shadow:0 2px 20px rgba(0,0,0,.3);margin-bottom:12px}
.hero h1 span{color:#FFD700}
.hero p{font-size:1.2rem;color:rgba(255,255,255,.92);max-width:600px;margin-bottom:20px}
.hero-btn{display:inline-block;padding:14px 40px;background:linear-gradient(135deg,#FF6B8A,#9B59B6);color:#fff;border-radius:30px;font-size:1.1rem;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(255,107,138,.4);color:#fff}

/* ---- Section Common ---- */
.section{padding:50px 0}
.section-title{text-align:center;margin-bottom:36px}
.section-title h2{font-size:2rem;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:4px;background:linear-gradient(90deg,#FF6B8A,#9B59B6);border-radius:2px;margin:10px auto 0}
.section-title p{color:#888;font-size:1rem;margin-top:6px}

/* ---- Video Card Grid ---- */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.video-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(155,89,182,.08);transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(255,107,138,.15)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img,.video-thumb video{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img,.video-card:hover .video-thumb video{transform:scale(1.06)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.35);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn span{width:56px;height:56px;background:rgba(255,107,138,.9);border-radius:50%;display:flex;align-items:center;justify-content:center}
.play-btn span::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:14px 16px}
.video-info h3{font-size:.95rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:14px;font-size:.8rem;color:#999}
.video-meta span{display:flex;align-items:center;gap:4px}
.tag{display:inline-block;padding:2px 10px;border-radius:10px;font-size:.75rem;background:linear-gradient(135deg,rgba(255,107,138,.12),rgba(155,89,182,.12));color:#9B59B6;margin-bottom:6px}
.video-desc{font-size:.82rem;color:#888;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}

/* ---- Feature Cards ---- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:#fff;border-radius:16px;padding:30px 24px;text-align:center;box-shadow:0 4px 20px rgba(155,89,182,.06);transition:transform .3s}
.feature-card:hover{transform:translateY(-5px)}
.feature-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#FF6B8A,#9B59B6);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{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:16px;overflow:hidden;text-align:center;box-shadow:0 4px 20px rgba(155,89,182,.06);transition:transform .3s}
.expert-card:hover{transform:translateY(-5px)}
.expert-avatar{width:100%;aspect-ratio:1;object-fit:cover}
.expert-card-body{padding:18px 16px}
.expert-card h3{font-size:1.05rem;margin-bottom:4px}
.expert-card .role{color:#FF6B8A;font-size:.85rem;margin-bottom:8px}
.expert-card p{font-size:.85rem;color:#777;line-height:1.5;margin-bottom:12px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;border-radius:20px;font-size:.8rem;border:1px solid #FF6B8A;color:#FF6B8A;transition:all .3s;display:inline-block}
.btn-sm:hover{background:#FF6B8A;color:#fff}
.btn-sm.filled{background:linear-gradient(135deg,#FF6B8A,#9B59B6);color:#fff;border:none}
.btn-sm.filled:hover{opacity:.85;color:#fff}

/* ---- Brand Wall ---- */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{background:#fff;padding:16px 28px;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.04);font-size:1rem;font-weight:600;color:#666;transition:all .3s}
.brand-wall .brand-item:hover{box-shadow:0 4px 20px rgba(255,107,138,.12);color:#FF6B8A}

/* ---- FAQ Section ---- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:12px;margin-bottom:14px;box-shadow:0 2px 12px rgba(155,89,182,.05);overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-q:hover{background:rgba(255,107,138,.04)}
.faq-q::after{content:"+";font-size:1.4rem;color:#FF6B8A;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;color:#666;font-size:.95rem;line-height:1.7}
.faq-item.open .faq-a{max-height:300px;padding:0 24px 18px}

/* ---- Reviews ---- */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.review-card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 4px 20px rgba(155,89,182,.06)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,#FF6B8A,#9B59B6);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;font-size:.95rem}
.review-date{font-size:.8rem;color:#aaa}
.review-stars{color:#FFD700;margin-bottom:8px;font-size:.9rem}
.review-text{font-size:.9rem;color:#555;line-height:1.7}

/* ---- Contact Section ---- */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;align-items:start}
.contact-info{background:#fff;border-radius:16px;padding:30px;box-shadow:0 4px 20px rgba(155,89,182,.06)}
.contact-info h3{font-size:1.2rem;margin-bottom:16px;color:#FF6B8A}
.contact-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px;font-size:.95rem;color:#555}
.contact-item strong{color:#2d2d3a;min-width:80px}
.qrcode-wrap{display:flex;gap:24px;justify-content:center}
.qrcode-box{text-align:center}
.qrcode-box img{width:140px;height:140px;border-radius:10px;margin-bottom:8px}
.qrcode-box p{font-size:.85rem;color:#777}

/* ---- Footer ---- */
.site-footer{background:linear-gradient(135deg,#2d2d3a 0%,#1a1a2e 100%);color:rgba(255,255,255,.7);padding:40px 0 20px;margin-top:50px}
.footer-logo{display:flex;align-items:center;gap:8px}
.footer-logo img{height:36px;width:auto}
.footer-logo-text{font-size:1.2rem;font-weight:700;color:#fff}
.footer-top{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-col h4{color:#fff;font-size:1.05rem;margin-bottom:14px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:3px;background:linear-gradient(90deg,#FF6B8A,#9B59B6);border-radius:2px}
.footer-col a{display:block;color:rgba(255,255,255,.6);font-size:.9rem;margin-bottom:8px;transition:color .3s}
.footer-col a:hover{color:#FF6B8A}
.footer-col p{font-size:.9rem;line-height:1.7;margin-bottom:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;text-align:center;font-size:.85rem}
.footer-bottom a{color:#FF6B8A}

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

/* ---- Breadcrumb ---- */
.breadcrumb{padding:14px 0;font-size:.9rem;color:#999}
.breadcrumb a{color:#FF6B8A}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ---- How-To Guide ---- */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:20px}
.howto-step{background:#fff;border-radius:14px;padding:24px 20px;text-align:center;box-shadow:0 4px 16px rgba(155,89,182,.06);position:relative}
.step-num{width:40px;height:40px;background:linear-gradient(135deg,#FF6B8A,#9B59B6);border-radius:50%;color:#fff;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;margin-bottom:8px}
.howto-step p{font-size:.85rem;color:#777}

/* ---- Inner Page Banner ---- */
.page-banner{background:linear-gradient(135deg,#FF6B8A 0%,#9B59B6 100%);padding:50px 0;text-align:center;border-radius:0 0 30px 30px;margin-bottom:40px}
.page-banner h1{color:#fff;font-size:2.2rem;margin-bottom:8px}
.page-banner p{color:rgba(255,255,255,.85);font-size:1.05rem}

/* ---- Community Cards ---- */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.community-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(155,89,182,.06);transition:transform .3s}
.community-card:hover{transform:translateY(-5px)}
.community-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.community-card-body{padding:16px}
.community-card h3{font-size:1rem;margin-bottom:6px}
.community-card p{font-size:.85rem;color:#777}

/* ---- AI Feature Section ---- */
.ai-showcase{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
.ai-showcase img{border-radius:16px;box-shadow:0 8px 30px rgba(155,89,182,.1)}
.ai-text h3{font-size:1.5rem;margin-bottom:12px}
.ai-text p{color:#666;margin-bottom:16px;line-height:1.8}
.ai-tags{display:flex;flex-wrap:wrap;gap:8px}
.ai-tag{padding:6px 16px;border-radius:20px;background:linear-gradient(135deg,rgba(255,107,138,.1),rgba(155,89,182,.1));color:#9B59B6;font-size:.85rem}

/* ---- 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)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr 1fr}
}
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.show{display:flex}
  .mobile-toggle{display:block}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:1fr}
  .community-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .ai-showcase{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr 1fr}
  .hero h1{font-size:1.8rem}
  .hero-bg{height:320px}
  .search-wrap input{width:60vw}
  .brand-wall{gap:14px}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .qrcode-wrap{flex-direction:column;align-items:center}
}
/* 滚动动画类（百度友好：不初始隐藏内容） */
.section-anim{transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.section-visible{opacity:1!important;transform:translateY(0)!important}