/* ============================================
   17c一起草 - 原创样式表
   品牌色：珊瑚粉 #FF6B6B / 金色 #FFD700 / 深海蓝 #1A1A3E
   ============================================ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;color:#2d2d3a;background:#faf8f5;line-height:1.8}
a{color:#FF6B6B;text-decoration:none;transition:color .3s}
a:hover{color:#e05555}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 头部导航 */
.site-header{background:linear-gradient(135deg,#1A1A3E 0%,#2d2d5e 100%);position:sticky;top:0;z-index:999;box-shadow:0 2px 20px rgba(0,0,0,.3)}
.header-top{display:flex;align-items:center;justify-content:space-between;padding:10px 20px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-wrap .brand-text{color:#FFD700;font-size:1.4rem;font-weight:700;letter-spacing:1px}
.main-nav{display:flex;gap:0}
.main-nav a{color:#f0e6d3;padding:12px 16px;font-size:.95rem;transition:all .3s;border-bottom:3px solid transparent}
.main-nav a:hover,.main-nav a.active{color:#FFD700;border-bottom-color:#FF6B6B;background:rgba(255,107,107,.1)}

/* 搜索框 */
.search-bar{background:#2d2d5e;padding:8px 0;border-top:1px solid rgba(255,215,0,.15)}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:520px;width:100%}
.search-box input{flex:1;padding:8px 16px;border:2px solid #FFD700;border-right:none;border-radius:25px 0 0 25px;background:#1A1A3E;color:#f0e6d3;font-size:.9rem;outline:none}
.search-box input::placeholder{color:#8888aa}
.search-box button{padding:8px 24px;background:linear-gradient(135deg,#FF6B6B,#e05555);color:#fff;border:2px solid #FF6B6B;border-radius:0 25px 25px 0;cursor:pointer;font-size:.9rem;transition:background .3s}
.search-box button:hover{background:linear-gradient(135deg,#e05555,#cc4444)}

/* Banner */
.hero-banner{position:relative;overflow:hidden;min-height:420px;display:flex;align-items:center;justify-content:center;background:#1A1A3E}
.hero-banner img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.7}
.hero-overlay{position:relative;z-index:2;text-align:center;padding:60px 20px;max-width:800px}
.hero-overlay h1{font-size:2.8rem;color:#FFD700;text-shadow:2px 2px 8px rgba(0,0,0,.7);margin-bottom:16px;line-height:1.3}
.hero-overlay p{font-size:1.15rem;color:#f0e6d3;text-shadow:1px 1px 4px rgba(0,0,0,.6);margin-bottom:24px}
.hero-overlay .hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero-overlay .hero-tags span{background:rgba(255,107,107,.85);color:#fff;padding:6px 16px;border-radius:20px;font-size:.85rem}

/* 面包屑 */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#FF6B6B}
.breadcrumb span{margin:0 6px;color:#ccc}

/* 通用区块 */
.section{padding:50px 0}
.section-alt{background:#fff}
.section-dark{background:linear-gradient(135deg,#1A1A3E 0%,#2d2d5e 100%);color:#f0e6d3}
.section-title{text-align:center;margin-bottom:36px}
.section-title h2{font-size:1.9rem;color:#1A1A3E;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#FF6B6B,#FFD700)}
.section-dark .section-title h2{color:#FFD700}
.section-title p{color:#777;margin-top:8px;font-size:.95rem}
.section-dark .section-title p{color:#bbb}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(255,107,107,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#1A1A3E}
.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(1.08)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(26,26,62,.5);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:56px;height:56px;filter:drop-shadow(0 2px 8px rgba(0,0,0,.4))}
.video-meta{padding:16px}
.video-meta h3{font-size:1.05rem;color:#1A1A3E;margin-bottom:6px;line-height:1.4}
.video-meta .meta-info{display:flex;gap:12px;font-size:.8rem;color:#999;flex-wrap:wrap}
.video-meta .meta-info span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:#fff0f0;color:#FF6B6B;padding:2px 10px;border-radius:12px;font-size:.75rem;margin-top:8px}

/* 模块卡片 */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.module-card{background:#fff;border-radius:12px;padding:28px 24px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .3s;border:2px solid transparent}
.module-card:hover{border-color:#FF6B6B;transform:translateY(-4px)}
.module-card .icon{font-size:2.4rem;margin-bottom:12px}
.module-card h3{font-size:1.1rem;color:#1A1A3E;margin-bottom:8px}
.module-card p{font-size:.9rem;color:#666;line-height:1.6}

/* 专家卡片 */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.08);text-align:center;padding:28px 20px;transition:all .3s}
.expert-card:hover{box-shadow:0 8px 30px rgba(255,107,107,.12)}
.expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid #FFD700}
.expert-card h4{font-size:1.05rem;color:#1A1A3E;margin-bottom:4px}
.expert-card .role{color:#FF6B6B;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#666;line-height:1.6}
.expert-card .expert-btns{margin-top:14px;display:flex;gap:8px;justify-content:center}
.btn-sm{display:inline-block;padding:6px 16px;border-radius:20px;font-size:.8rem;transition:all .3s;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,#FF6B6B,#e05555);color:#fff}
.btn-primary:hover{background:linear-gradient(135deg,#e05555,#cc4444);color:#fff}
.btn-outline{border:1px solid #FF6B6B;color:#FF6B6B}
.btn-outline:hover{background:#FF6B6B;color:#fff}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid #eee;padding:18px 0}
.faq-q{font-weight:700;color:#1A1A3E;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:1rem}
.faq-q::after{content:'+';font-size:1.4rem;color:#FF6B6B;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{display:none;padding-top:12px;color:#555;font-size:.9rem;line-height:1.7}
.faq-item.open .faq-a{display:block}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06);border-left:4px solid #FFD700}
.review-card .stars{color:#FFD700;font-size:1.1rem;margin-bottom:8px}
.review-card blockquote{font-size:.9rem;color:#555;line-height:1.7;font-style:italic;margin-bottom:12px}
.review-card .reviewer{font-size:.85rem;color:#999}

/* 合作品牌墙 */
.brand-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.brand-wall .brand-item{background:#fff;padding:16px 28px;border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.05);font-size:1rem;color:#555;font-weight:600;transition:all .3s}
.brand-wall .brand-item:hover{box-shadow:0 4px 20px rgba(255,107,107,.12);color:#FF6B6B}

/* How-To */
.howto-steps{max-width:700px;margin:0 auto}
.howto-step{display:flex;gap:20px;margin-bottom:28px;align-items:flex-start}
.step-num{flex-shrink:0;width:44px;height:44px;background:linear-gradient(135deg,#FF6B6B,#e05555);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem}
.step-content h4{color:#1A1A3E;margin-bottom:4px;font-size:1rem}
.step-content p{color:#666;font-size:.9rem}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06);text-align:center}
.contact-card h4{color:#1A1A3E;margin-bottom:12px;font-size:1.05rem}
.contact-card p{font-size:.9rem;color:#666;margin-bottom:6px}
.contact-card img{max-width:160px;margin:12px auto 0;border-radius:8px}

/* 页脚 */
.site-footer{background:#1A1A3E;color:#bbb;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#FFD700;margin-bottom:14px;font-size:1rem}
.footer-col p,.footer-col a{font-size:.85rem;color:#999;display:block;margin-bottom:6px}
.footer-col a:hover{color:#FF6B6B}
.footer-col img{max-width:120px;border-radius:6px;margin-top:8px}
.footer-bottom{border-top:1px solid rgba(255,215,0,.15);padding-top:18px;text-align:center;font-size:.8rem;color:#777}
.footer-bottom a{color:#FFD700}

/* 友情链接 */
.friend-links{padding:16px 0;border-top:1px solid rgba(255,215,0,.1);margin-top:20px}
.friend-links h4{color:#FFD700;font-size:.85rem;margin-bottom:8px}
.friend-links a{color:#888;font-size:.8rem;margin-right:12px}
.friend-links a:hover{color:#FF6B6B}

/* 社交分享 */
.share-bar{display:flex;gap:10px;justify-content:center;margin:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;cursor:pointer;transition:opacity .3s}
.share-btn:hover{opacity:.85;color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* 回到顶部 */
.back-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:linear-gradient(135deg,#FF6B6B,#e05555);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;transition:opacity .3s;z-index:998;box-shadow:0 4px 12px rgba(255,107,107,.3)}
.back-top.show{opacity:1}

/* 干扰标签隐藏 */
.gt-noise{position:absolute;left:-9999px;top:-9999px;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none}

/* 响应式 */
@media(max-width:768px){
  .header-top{flex-direction:column;gap:10px}
  .main-nav{flex-wrap:wrap;justify-content:center;gap:0}
  .main-nav a{padding:8px 12px;font-size:.85rem}
  .hero-overlay h1{font-size:1.8rem}
  .hero-overlay p{font-size:.95rem}
  .section{padding:30px 0}
  .section-title h2{font-size:1.5rem}
  .video-grid,.module-grid,.expert-grid,.review-grid,.contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .hero-overlay h1{font-size:1.4rem}
  .main-nav a{padding:6px 8px;font-size:.8rem}
  .search-box{max-width:100%}
}