/* ============================================
   九一 原创样式 - fstop.net.cn
   配色：深靛蓝 #0F0C29 / 玫瑰金 #E87995 / 天蓝 #78C8FF / 琥珀金 #FFB74D
   ============================================ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;color:#2d2d3a;background:#faf8f5;line-height:1.7}
a{color:inherit;text-decoration:none;transition:color .2s}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* === 顶部导航 === */
.site-header{background:linear-gradient(135deg,#0F0C29 0%,#1a1440 100%);position:sticky;top:0;z-index:999;box-shadow:0 2px 20px rgba(0,0,0,.3)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.2rem;font-weight:700;color:#fff}
.nav-logo img{border-radius:8px}
.nav-menu{display:flex;gap:6px}
.nav-menu a{color:rgba(255,255,255,.85);padding:8px 14px;border-radius:8px;font-size:.9rem;transition:all .25s}
.nav-menu a:hover{background:rgba(232,121,149,.2);color:#E87995}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* === 搜索栏 === */
.search-bar{background:#13103a;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.search-inner{display:flex;max-width:600px;margin:0 auto}
.search-inner input{flex:1;padding:10px 18px;border:2px solid rgba(232,121,149,.3);border-right:none;border-radius:25px 0 0 25px;background:rgba(255,255,255,.06);color:#fff;font-size:.9rem;outline:none;transition:border-color .3s}
.search-inner input:focus{border-color:#E87995}
.search-inner input::placeholder{color:rgba(255,255,255,.4)}
.search-inner button{padding:10px 24px;background:linear-gradient(135deg,#E87995,#FFB74D);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.9rem;font-weight:600;transition:opacity .3s}
.search-inner button:hover{opacity:.85}

/* === 面包屑 === */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#E87995}
.breadcrumb span{margin:0 6px;color:#ccc}

/* === 通用区块 === */
.section{padding:60px 0}
.section-dark{background:linear-gradient(180deg,#0F0C29 0%,#1a1440 100%);color:#fff}
.section-rose{background:linear-gradient(135deg,#1a0e2e 0%,#2d1540 50%,#0F0C29 100%);color:#fff}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.8rem;font-weight:700;margin-bottom:10px}
.section-title p{color:#999;font-size:.95rem;max-width:600px;margin:0 auto}
.section-dark .section-title p{color:rgba(255,255,255,.6)}
.highlight{color:#E87995}
.highlight-blue{color:#78C8FF}
.highlight-gold{color:#FFB74D}

/* === Hero Banner === */
.hero{position:relative;background:linear-gradient(135deg,#0F0C29 0%,#302060 50%,#1a1440 100%);padding:80px 0 60px;overflow:hidden;text-align:center;color:#fff}
.hero h1{font-size:2.4rem;font-weight:800;margin-bottom:16px;letter-spacing:1px}
.hero .subtitle{font-size:1.1rem;color:rgba(255,255,255,.7);margin-bottom:30px;max-width:650px;margin-left:auto;margin-right:auto}
.hero .cta-group{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-rose{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#E87995,#d4567a);color:#fff;border-radius:30px;font-weight:600;font-size:.95rem;transition:transform .2s,box-shadow .2s}
.btn-rose:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(232,121,149,.4)}
.btn-outline{display:inline-block;padding:12px 32px;border:2px solid rgba(255,255,255,.3);color:#fff;border-radius:30px;font-weight:600;font-size:.95rem;transition:all .2s}
.btn-outline:hover{border-color:#78C8FF;color:#78C8FF}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s;text-decoration:none;color:#2d2d3a;display:block}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(0,0,0,.12)}
.section-dark .video-card{background:rgba(255,255,255,.05);color:#fff}
.thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#1a1440}
.thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:52px;height:52px;background:rgba(232,121,149,.9);border-radius:50%;opacity:0;transition:opacity .3s;display:flex;align-items:center;justify-content:center}
.play-btn::after{content:"";border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.card-body{padding:14px 16px}
.card-title{font-size:.95rem;font-weight:600;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{font-size:.8rem;color:#999;margin-top:6px;display:flex;gap:12px}
.card-tags{margin-top:8px;display:flex;gap:6px;flex-wrap:wrap}
.tag{display:inline-block;padding:3px 10px;background:rgba(232,121,149,.1);color:#E87995;border-radius:12px;font-size:.75rem}
.section-dark .tag{background:rgba(232,121,149,.15)}

/* === 专家卡片 === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{text-align:center;padding:30px 20px;background:#fff;border-radius:16px;box-shadow:0 4px 20px rgba(0,0,0,.05);transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;object-fit:cover;border:3px solid #E87995}
.role{font-size:.85rem;color:#E87995;margin-top:4px;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#666;line-height:1.6}
.btn-sm{display:inline-block;margin-top:12px;padding:7px 20px;background:linear-gradient(135deg,#E87995,#d4567a);color:#fff;border-radius:20px;font-size:.8rem;transition:opacity .2s}
.btn-sm:hover{opacity:.85}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:12px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.04)}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:.95rem}
.faq-q::after{content:"+";font-size:1.3rem;color:#E87995;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px 18px;color:#666;font-size:.9rem;line-height:1.8;display:none}
.faq-item.open .faq-a{display:block}

/* === 评价 === */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 4px 18px rgba(0,0,0,.05)}
.stars{color:#FFB74D;font-size:1.1rem;margin-bottom:10px;letter-spacing:2px}
.review-text{font-size:.9rem;color:#555;line-height:1.7;margin-bottom:14px}
.reviewer{display:flex;align-items:center;gap:10px}
.reviewer-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#E87995,#78C8FF);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem;font-weight:700;flex-shrink:0}
.reviewer-name{font-size:.85rem;font-weight:600}
.reviewer-date{font-size:.75rem;color:#aaa}

/* === 合作伙伴 === */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:20px}
.partner-item{padding:16px 32px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:12px;color:rgba(255,255,255,.7);font-size:.9rem;font-weight:500;transition:all .3s}
.partner-item:hover{border-color:#E87995;color:#E87995}

/* === How-To步骤 === */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.howto-step{background:#fff;border-radius:14px;padding:28px 20px;text-align:center;box-shadow:0 4px 18px rgba(0,0,0,.05);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);display:block;width:40px;height:40px;line-height:40px;background:linear-gradient(135deg,#E87995,#FFB74D);color:#fff;border-radius:50%;font-weight:700;margin:0 auto 14px;font-size:1.1rem}
.howto-step h4{font-size:1rem;margin-bottom:8px;color:#1a1440}
.howto-step p{font-size:.85rem;color:#666;line-height:1.6}
.section-dark .howto-step{background:rgba(255,255,255,.05)}
.section-dark .howto-step h4{color:#fff}
.section-dark .howto-step p{color:rgba(255,255,255,.6)}

/* === 联系 === */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.contact-card{background:#fff;border-radius:14px;padding:28px;text-align:center;box-shadow:0 4px 18px rgba(0,0,0,.05)}
.contact-card .icon{font-size:2rem;margin-bottom:12px}
.contact-card h4{font-size:1.05rem;margin-bottom:10px;color:#1a1440}
.contact-card p{font-size:.85rem;color:#666;margin-top:6px}

/* === 分享 === */
.share-bar{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.share-btn{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;font-weight:700;cursor:pointer;transition:transform .2s,box-shadow .2s}
.share-btn:hover{transform:scale(1.1);box-shadow:0 6px 20px rgba(0,0,0,.2)}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#111}
.share-btn.bilibili{background:#FB7299}

/* === 页脚 === */
.site-footer{background:#0a0820;color:rgba(255,255,255,.7);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}
.footer-logo{display:flex;align-items:center;gap:10px;font-size:1.1rem;font-weight:700;color:#fff;margin-bottom:14px}
.footer-logo img{border-radius:6px}
.footer-col p{font-size:.85rem;line-height:1.7;margin-top:6px}
.footer-col h4{color:#E87995;font-size:.95rem;margin-bottom:14px}
.footer-col a{display:block;font-size:.85rem;color:rgba(255,255,255,.6);padding:4px 0;transition:color .2s}
.footer-col a:hover{color:#E87995}
.footer-qr{display:flex;gap:12px;margin-top:14px}
.footer-qr img{width:90px;height:90px;border-radius:8px;border:2px solid rgba(255,255,255,.1)}
.footer-bottom{text-align:center;padding:20px 0;margin-top:30px;border-top:1px solid rgba(255,255,255,.08);font-size:.8rem;color:rgba(255,255,255,.4)}

/* === 内页布局 === */
.page-layout{display:grid;grid-template-columns:1fr 300px;gap:30px}
.main-content{min-width:0}
.sidebar .widget{background:#fff;border-radius:14px;padding:20px;margin-bottom:20px;box-shadow:0 4px 18px rgba(0,0,0,.05)}
.sidebar .widget h4{font-size:1rem;color:#1a1440;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid #E87995}
.widget-list a{display:block;padding:8px 0;font-size:.85rem;color:#555;border-bottom:1px solid #f0f0f0;transition:color .2s}
.widget-list a:hover{color:#E87995}
.widget-list a:last-child{border-bottom:none}

/* === 视频播放器 === */
.video-player-wrap{position:relative;padding-top:56.25%;background:#000;border-radius:14px;overflow:hidden;margin-bottom:20px}
.video-player-wrap video,.video-player-wrap iframe{position:absolute;top:0;left:0;width:100%;height:100%}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-menu{display:none;position:absolute;top:64px;left:0;right:0;background:#0F0C29;flex-direction:column;padding:16px;border-top:1px solid rgba(255,255,255,.1)}
  .nav-menu.active{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:1.6rem}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .page-layout{grid-template-columns:1fr}
  .sidebar{order:-1}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.4rem}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .hero{padding:50px 0 40px}
  .cta-group{flex-direction:column;align-items:center}
}