/* ========================================
   抖阴 - 全站样式表
   品牌色：深蓝#0d1b2a 青蓝#00d4ff 橙色#ff6b35
   ======================================== */

/* Reset & Base */
*,*::before,*::after{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",Arial,sans-serif;color:#e0e6ed;background:#0d1b2a;line-height:1.7;overflow-x:hidden}
a{color:#00d4ff;text-decoration:none;transition:color .3s}
a:hover{color:#ff6b35}
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;color:#fff}

/* Container */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-title{text-align:center;margin-bottom:40px;font-size:2rem;position:relative;padding-bottom:15px}
.section-title::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:80px;height:3px;background:linear-gradient(90deg,#00d4ff,#ff6b35)}
.section-subtitle{text-align:center;color:#8899aa;margin-bottom:30px;font-size:1.05rem}

/* ========== Header & Navigation ========== */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,27,42,.95);backdrop-filter:blur(10px);border-bottom:1px solid rgba(0,212,255,.15);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1200px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:42px;width:auto}
.logo-text{font-size:1.3rem;font-weight:800;background:linear-gradient(135deg,#00d4ff,#ff6b35);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 14px;font-size:.92rem;color:#c0cdd8;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#00d4ff}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:#00d4ff;transition:all .3s;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:25px;height:2px;background:#fff;transition:all .3s}

/* Search Bar */
.search-bar{background:rgba(13,27,42,.9);padding:10px 0;border-bottom:1px solid rgba(0,212,255,.08)}
.search-wrap{max-width:600px;margin:0 auto;display:flex;gap:8px;padding:0 20px}
.search-wrap input{flex:1;padding:10px 16px;border:1px solid rgba(0,212,255,.3);border-radius:25px;background:rgba(255,255,255,.05);color:#fff;font-size:.9rem;outline:none;transition:border-color .3s}
.search-wrap input:focus{border-color:#00d4ff}
.search-wrap input::placeholder{color:#667788}
.search-wrap button{padding:10px 24px;border:none;border-radius:25px;background:linear-gradient(135deg,#00d4ff,#0099cc);color:#fff;font-size:.9rem;cursor:pointer;transition:all .3s}
.search-wrap button:hover{background:linear-gradient(135deg,#ff6b35,#cc5528)}

/* ========== Banner ========== */
.hero-banner{position:relative;min-height:75vh;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:60px}
.hero-banner .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.45)}
.hero-content{position:relative;z-index:2;text-align:center;padding:40px 20px;max-width:800px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 span{color:#00d4ff}
.hero-content p{font-size:1.15rem;color:#b8c8d8;margin-bottom:30px;line-height:1.8}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#00d4ff,#0099cc);color:#fff;border-radius:30px;font-size:1rem;font-weight:600;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(0,212,255,.3);color:#fff}
.btn-outline{display:inline-block;padding:14px 36px;border:2px solid #00d4ff;color:#00d4ff;border-radius:30px;font-size:1rem;font-weight:600;transition:all .3s;background:transparent}
.btn-outline:hover{background:#00d4ff;color:#0d1b2a}

/* ========== Breadcrumb ========== */
.breadcrumb{padding:15px 0;font-size:.85rem;color:#667788}
.breadcrumb a{color:#00d4ff}
.breadcrumb span{margin:0 8px;color:#445566}

/* ========== Video Card Grid ========== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;margin-bottom:50px}
.video-card{background:rgba(255,255,255,.04);border-radius:12px;overflow:hidden;transition:all .3s;border:1px solid rgba(0,212,255,.08)}
.video-card:hover{transform:translateY(-5px);box-shadow:0 12px 35px rgba(0,212,255,.12);border-color:rgba(0,212,255,.25)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;cursor:pointer}
.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)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(0,212,255,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:all .3s;cursor:pointer}
.play-btn::after{content:'';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-info{padding:16px}
.video-info h3{font-size:1rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:16px;font-size:.8rem;color:#667788}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:3px 10px;background:rgba(0,212,255,.12);color:#00d4ff;border-radius:12px;font-size:.75rem;margin-top:8px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}

/* ========== Section Modules ========== */
.section{padding:70px 0}
.section-alt{background:rgba(255,255,255,.02)}
.section-dark{background:#0a1628}

/* Module Cards */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.module-card{background:rgba(255,255,255,.04);border-radius:12px;padding:30px 24px;text-align:center;transition:all .3s;border:1px solid rgba(0,212,255,.06)}
.module-card:hover{border-color:rgba(0,212,255,.25);transform:translateY(-3px)}
.module-icon{font-size:2.5rem;margin-bottom:16px}
.module-card h3{font-size:1.1rem;margin-bottom:10px}
.module-card p{color:#8899aa;font-size:.9rem;line-height:1.6}

/* Expert Cards */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:rgba(255,255,255,.04);border-radius:12px;overflow:hidden;text-align:center;transition:all .3s;border:1px solid rgba(0,212,255,.06)}
.expert-card:hover{border-color:rgba(0,212,255,.25);transform:translateY(-3px)}
.expert-card img{width:100%;aspect-ratio:1;object-fit:cover}
.expert-info{padding:20px}
.expert-info h4{font-size:1.05rem;margin-bottom:6px}
.expert-info .role{color:#00d4ff;font-size:.85rem;margin-bottom:10px}
.expert-info p{color:#8899aa;font-size:.85rem;line-height:1.6;margin-bottom:12px}
.expert-links{display:flex;gap:10px;justify-content:center}
.expert-links a{padding:6px 16px;border:1px solid rgba(0,212,255,.3);border-radius:20px;font-size:.8rem;color:#00d4ff;transition:all .3s}
.expert-links a:hover{background:#00d4ff;color:#0d1b2a}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:rgba(255,255,255,.04);border-radius:10px;margin-bottom:12px;border:1px solid rgba(0,212,255,.06);overflow:hidden}
.faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;transition:background .3s}
.faq-q:hover{background:rgba(0,212,255,.05)}
.faq-q::after{content:'+';font-size:1.3rem;color:#00d4ff;transition:transform .3s}
.faq-item.active .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;color:#8899aa;line-height:1.7;font-size:.92rem}
.faq-item.active .faq-a{padding:0 24px 18px;max-height:300px}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:rgba(255,255,255,.04);border-radius:12px;padding:24px;border:1px solid rgba(0,212,255,.06)}
.review-stars{color:#ff6b35;margin-bottom:10px;font-size:1.1rem}
.review-text{color:#b8c8d8;font-size:.92rem;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-author{display:flex;align-items:center;gap:10px}
.review-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#00d4ff,#ff6b35);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem}
.review-name{font-size:.85rem;color:#c0cdd8}
.review-date{font-size:.75rem;color:#667788}

/* Community Cards */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px}
.community-card{background:rgba(255,255,255,.04);border-radius:12px;padding:20px;text-align:center;transition:all .3s;border:1px solid rgba(0,212,255,.06);cursor:pointer}
.community-card:hover{border-color:#ff6b35;transform:translateY(-3px)}
.community-card .icon{font-size:2.5rem;margin-bottom:10px}
.community-card h4{font-size:.95rem;margin-bottom:6px}
.community-card p{color:#667788;font-size:.8rem}

/* Partner Logos */
.partner-wall{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center}
.partner-wall .partner-item{background:rgba(255,255,255,.06);border-radius:10px;padding:16px 28px;border:1px solid rgba(0,212,255,.08);transition:all .3s}
.partner-wall .partner-item:hover{border-color:#00d4ff}

/* Contact Section */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:rgba(255,255,255,.04);border-radius:12px;padding:28px;border:1px solid rgba(0,212,255,.06)}
.contact-card h4{font-size:1.05rem;margin-bottom:14px;color:#00d4ff}
.contact-card p{color:#8899aa;font-size:.9rem;line-height:1.8}
.contact-card .qr-img{width:160px;margin:12px auto 0;border-radius:8px}

/* How-To Guide */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px;margin-top:30px}
.howto-step{text-align:center;padding:24px;background:rgba(255,255,255,.04);border-radius:12px;border:1px solid rgba(0,212,255,.06)}
.step-num{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#00d4ff,#0099cc);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:700;margin:0 auto 14px}
.howto-step h4{font-size:.95rem;margin-bottom:8px}
.howto-step p{color:#8899aa;font-size:.85rem}

/* Share Buttons */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{padding:10px 20px;border-radius:25px;font-size:.85rem;font-weight:600;transition:all .3s;border:none;cursor:pointer;color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#fb7299}
.share-btn:hover{transform:translateY(-2px);opacity:.9}

/* ========== Footer ========== */
.site-footer{background:#060e18;border-top:1px solid rgba(0,212,255,.1);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:40px}
.footer-col h4{font-size:1rem;margin-bottom:16px;color:#fff;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:40px;height:2px;background:#00d4ff}
.footer-col p,.footer-col a{color:#667788;font-size:.85rem;line-height:2}
.footer-col a:hover{color:#00d4ff}
.footer-col .footer-logo{height:36px;margin-bottom:12px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding:20px 0;text-align:center;color:#445566;font-size:.8rem}
.footer-bottom a{color:#667788}
.footer-qr{display:flex;gap:20px;margin-top:10px}
.footer-qr img{width:100px;border-radius:6px}
.footer-qr-label{font-size:.75rem;color:#667788;text-align:center;margin-top:4px}

/* ========== Inner Page ========== */
.page-header{padding:100px 0 40px;background:linear-gradient(180deg,rgba(0,212,255,.08),transparent);text-align:center}
.page-header h1{font-size:2.2rem;margin-bottom:10px}
.page-header p{color:#8899aa;font-size:1rem}
.page-content{padding:50px 0}
.article-body{max-width:800px;margin:0 auto;line-height:1.9;color:#b8c8d8}
.article-body h2{font-size:1.5rem;margin:30px 0 16px;color:#00d4ff}
.article-body h3{font-size:1.2rem;margin:24px 0 12px}
.article-body p{margin-bottom:16px}
.article-body img{border-radius:10px;margin:20px 0}

/* Tags */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}
.tag-cloud a{padding:5px 14px;background:rgba(0,212,255,.1);color:#00d4ff;border-radius:15px;font-size:.8rem;transition:all .3s}
.tag-cloud a:hover{background:#00d4ff;color:#0d1b2a}

/* ========== Responsive ========== */
@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:flex}
  .hero-content h1{font-size:1.8rem}
  .hero-content p{font-size:.95rem}
  .section-title{font-size:1.5rem}
  .video-grid{grid-template-columns:1fr}
  .module-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-banner{min-height:55vh}
  .search-wrap{flex-direction:column}
  .search-wrap button{width:100%}
}
@media(min-width:769px) and (max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .module-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
}

/* Lazy Load */
img[loading="lazy"]{opacity:0;transition:opacity .5s}
img[loading="lazy"].loaded,img[loading="lazy"][src]{opacity:1}

/* Animations */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeInUp .6s ease forwards}

/* MCP Frontend Placeholder */
.mcp-widget{background:rgba(0,212,255,.05);border:1px dashed rgba(0,212,255,.2);border-radius:12px;padding:30px;text-align:center;margin:20px 0}
.mcp-widget h4{color:#00d4ff;margin-bottom:10px}
.mcp-widget p{color:#667788;font-size:.85rem}

/* ========== Video Author Line ========== */
.video-author{font-size:.8rem;color:#8899aa;margin-bottom:6px}

/* ========== Video Modal ========== */
.video-modal{position:fixed;inset:0;z-index:9999;display:none;align-items:center;justify-content:center}
.video-modal.active{display:flex}
.video-modal-overlay{position:absolute;inset:0;background:rgba(0,0,0,.85)}
.video-modal-content{position:relative;z-index:2;width:90%;max-width:800px;background:#111a2a;border-radius:16px;overflow:hidden;border:1px solid rgba(0,212,255,.2)}
.video-modal-close{position:absolute;top:12px;right:16px;background:none;border:none;color:#fff;font-size:2rem;cursor:pointer;z-index:3;line-height:1;opacity:.7;transition:opacity .3s}
.video-modal-close:hover{opacity:1}
.video-modal-player{aspect-ratio:16/9;background:#0a1020;display:flex;align-items:center;justify-content:center}
.video-modal-placeholder{text-align:center;padding:40px}
.video-modal-icon{width:80px;height:80px;border-radius:50%;background:rgba(0,212,255,.15);margin:0 auto 20px;display:flex;align-items:center;justify-content:center;position:relative}
.video-modal-icon::after{content:'';border-style:solid;border-width:16px 0 16px 28px;border-color:transparent transparent transparent #00d4ff;margin-left:5px}
.video-modal-title{font-size:1.1rem;color:#fff;margin-bottom:8px}
.video-modal-hint{font-size:.85rem;color:#667788}

/* Community card as link */
a.community-card{display:block;text-decoration:none;color:inherit}
a.community-card:hover{color:inherit}
a.community-card h4{color:#fff}