/* ============================================
   亚博体育 - 原创样式表
   品牌色系：藏蓝 #1A1F3D / 橙红 #FF6B2B / 青绿 #00D4AA
   ============================================ */

/* --- 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;background:#0D1117;color:#E8ECF1;line-height:1.7;overflow-x:hidden}
a{color:#00D4AA;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B2B}
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}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:linear-gradient(90deg,#FF6B2B,#00D4AA);margin:10px auto 0}
.section-title p{color:#8B95A5;font-size:1rem}

/* --- Header / Navigation --- */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,17,23,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.06);transition:background .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:42px;width:auto}
.logo-wrap span{font-size:1.25rem;font-weight:800;color:#FF6B2B;letter-spacing:1px}
.main-nav ul{display:flex;gap:28px}
.main-nav a{color:#C8CDD5;font-size:.95rem;font-weight:500;padding:6px 0;position:relative;transition:color .3s}
.main-nav a::after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:#FF6B2B;transition:width .3s}
.main-nav a:hover,.main-nav a.active{color:#FF6B2B}
.main-nav a:hover::after,.main-nav a.active::after{width:100%}

/* --- Search Bar --- */
.search-bar{background:#161B2E;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.04)}
.search-bar form{display:flex;max-width:560px;margin:0 auto}
.search-bar input{flex:1;padding:10px 16px;border:1px solid rgba(255,255,255,.1);border-radius:6px 0 0 6px;background:#0D1117;color:#E8ECF1;font-size:.9rem;outline:none;transition:border-color .3s}
.search-bar input:focus{border-color:#00D4AA}
.search-bar button{padding:10px 24px;background:linear-gradient(135deg,#FF6B2B,#E05520);color:#fff;border:none;border-radius:0 6px 6px 0;cursor:pointer;font-size:.9rem;font-weight:600;transition:opacity .3s}
.search-bar button:hover{opacity:.85}

/* --- Mobile Menu --- */
.menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.menu-toggle span{width:24px;height:2px;background:#E8ECF1;transition:transform .3s}

/* --- Hero Banner --- */
.hero-banner{position:relative;min-height:520px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.hero-banner .hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-banner .hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,17,23,.3) 0%,rgba(13,17,23,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:780px;padding:40px 20px}
.hero-content h1{font-size:2.6rem;margin-bottom:16px;background:linear-gradient(135deg,#FF6B2B,#00D4AA);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content p{font-size:1.1rem;color:#B0B8C5;margin-bottom:24px;line-height:1.8}
.hero-content .hero-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero-content .hero-tags span{padding:6px 16px;background:rgba(255,107,43,.12);border:1px solid rgba(255,107,43,.3);border-radius:20px;font-size:.85rem;color:#FF6B2B}
.btn-primary{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#FF6B2B,#E05520);color:#fff;border-radius:8px;font-weight:600;font-size:1rem;transition:transform .3s,box-shadow .3s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,107,43,.3);color:#fff}
.btn-secondary{display:inline-block;padding:12px 32px;border:1px solid #00D4AA;color:#00D4AA;border-radius:8px;font-weight:600;font-size:1rem;transition:all .3s}
.btn-secondary:hover{background:#00D4AA;color:#0D1117}

/* --- Section Common --- */
.section{padding:70px 0}
.section-alt{background:#111827}
.section-dark{background:#0A0E18}

/* --- Video Card Grid --- */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.video-card{background:#161B2E;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(0,0,0,.4)}
.video-card .thumb-wrap{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb-wrap img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb-wrap img{transform:scale(1.06)}
.video-card .play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.4)}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:56px;height:56px;fill:#FF6B2B;filter:drop-shadow(0 2px 8px rgba(255,107,43,.5))}
.video-card .card-body{padding:16px}
.video-card .card-body h3{font-size:1rem;margin-bottom:8px;color:#E8ECF1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-meta{display:flex;gap:16px;font-size:.8rem;color:#6B7585}
.video-card .card-meta span{display:flex;align-items:center;gap:4px}
.video-card .card-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.video-card .card-tags span{font-size:.75rem;padding:3px 10px;background:rgba(0,212,170,.1);color:#00D4AA;border-radius:12px}
.video-card .duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}

/* --- Feature Grid --- */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.feature-card{background:#161B2E;border-radius:12px;padding:28px 24px;text-align:center;border:1px solid rgba(255,255,255,.04);transition:border-color .3s,transform .3s}
.feature-card:hover{border-color:rgba(255,107,43,.3);transform:translateY(-4px)}
.feature-card .icon{width:56px;height:56px;margin:0 auto 16px;background:linear-gradient(135deg,rgba(255,107,43,.15),rgba(0,212,170,.15));border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.6rem}
.feature-card h4{font-size:1.05rem;margin-bottom:8px}
.feature-card p{font-size:.88rem;color:#8B95A5;line-height:1.6}

/* --- Expert Section --- */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#161B2E;border-radius:12px;overflow:hidden;text-align:center;padding-bottom:20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-card .avatar{width:110px;height:110px;border-radius:50%;margin:24px auto 14px;overflow:hidden;border:3px solid #FF6B2B}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:1rem;margin-bottom:4px}
.expert-card .role{font-size:.85rem;color:#FF6B2B;margin-bottom:8px}
.expert-card p{font-size:.82rem;color:#8B95A5;padding:0 16px;line-height:1.5}
.expert-card .expert-links{display:flex;gap:10px;justify-content:center;margin-top:12px}
.expert-card .expert-links a{padding:6px 14px;font-size:.8rem;border-radius:6px;border:1px solid rgba(0,212,170,.4);color:#00D4AA;transition:all .3s}
.expert-card .expert-links a:hover{background:#00D4AA;color:#0D1117}

/* --- Community Grid --- */
.community-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.community-card{background:#161B2E;border-radius:12px;overflow:hidden;transition:transform .3s}
.community-card:hover{transform:translateY(-4px)}
.community-card .card-img{position:relative;padding-top:56.25%;overflow:hidden}
.community-card .card-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.community-card:hover .card-img img{transform:scale(1.05)}
.community-card .card-info{padding:16px}
.community-card .card-info h4{font-size:1rem;margin-bottom:6px}
.community-card .card-info p{font-size:.85rem;color:#8B95A5}

/* --- FAQ Section --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#161B2E;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(255,255,255,.04)}
.faq-item .faq-q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:background .3s}
.faq-item .faq-q:hover{background:rgba(255,107,43,.06)}
.faq-item .faq-q .arrow{transition:transform .3s;color:#FF6B2B;font-size:1.2rem}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s;padding:0 20px;color:#8B95A5;font-size:.9rem;line-height:1.7}
.faq-item.open .faq-a{max-height:300px;padding:0 20px 16px}

/* --- Reviews --- */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#161B2E;border-radius:12px;padding:24px;border:1px solid rgba(255,255,255,.04)}
.review-card .stars{color:#FF6B2B;margin-bottom:10px;font-size:1rem;letter-spacing:2px}
.review-card blockquote{font-size:.9rem;color:#B0B8C5;line-height:1.7;margin-bottom:12px;font-style:italic}
.review-card .reviewer{font-size:.85rem;color:#6B7585}
.review-card .reviewer strong{color:#E8ECF1}

/* --- Contact Section --- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:30px}
.contact-info{background:#161B2E;border-radius:12px;padding:28px}
.contact-info h4{font-size:1.1rem;margin-bottom:16px;color:#FF6B2B}
.contact-info .info-item{display:flex;gap:12px;margin-bottom:14px;align-items:flex-start}
.contact-info .info-item .label{color:#6B7585;min-width:70px;font-size:.88rem}
.contact-info .info-item .value{color:#E8ECF1;font-size:.88rem}
.qr-grid{display:flex;gap:24px;flex-wrap:wrap}
.qr-item{text-align:center}
.qr-item img{width:140px;height:140px;border-radius:8px;margin-bottom:8px}
.qr-item p{font-size:.82rem;color:#8B95A5}

/* --- Share Buttons --- */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-btn{padding:8px 20px;border-radius:6px;font-size:.85rem;font-weight:600;color:#fff;cursor:pointer;border:none;transition:opacity .3s}
.share-btn:hover{opacity:.8}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* --- How-To Guide --- */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;counter-reset:step}
.howto-step{background:#161B2E;border-radius:12px;padding:24px;position:relative;counter-increment:step;border:1px solid rgba(255,255,255,.04)}
.howto-step::before{content:counter(step);position:absolute;top:-12px;left:20px;width:28px;height:28px;background:linear-gradient(135deg,#FF6B2B,#E05520);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;color:#fff}
.howto-step h4{margin-bottom:8px;font-size:.95rem}
.howto-step p{font-size:.85rem;color:#8B95A5;line-height:1.6}

/* --- Partner Logos --- */
.partner-wall{display:flex;gap:30px;justify-content:center;flex-wrap:wrap;align-items:center;padding:20px 0}
.partner-wall .partner-item{width:100px;height:60px;background:#161B2E;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#6B7585;font-size:.75rem;border:1px solid rgba(255,255,255,.04)}

/* --- Breadcrumb --- */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#6B7585}
.breadcrumb a{color:#00D4AA}
.breadcrumb span{margin:0 8px;color:#4A5060}

/* --- Footer --- */
.site-footer{background:#0A0E18;border-top:1px solid rgba(255,255,255,.06);padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h5{font-size:.95rem;margin-bottom:14px;color:#FF6B2B}
.footer-col p,.footer-col a{font-size:.85rem;color:#6B7585;line-height:1.8}
.footer-col a:hover{color:#00D4AA}
.footer-col ul li{margin-bottom:6px}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.04);font-size:.82rem;color:#4A5060}
.footer-bottom a{color:#00D4AA}

/* --- JSON-LD hidden --- */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* --- Lazy Load Placeholder --- */
img[data-src]{opacity:0;transition:opacity .4s}
img.loaded{opacity:1}

/* --- Responsive --- */
@media(max-width:768px){
  .header-inner{padding:0 16px}
  .main-nav{position:fixed;top:68px;left:0;width:100%;background:#0D1117;border-top:1px solid rgba(255,255,255,.06);transform:translateY(-120%);transition:transform .3s;padding:20px 0}
  .main-nav.open{transform:translateY(0)}
  .main-nav ul{flex-direction:column;align-items:center;gap:16px}
  .menu-toggle{display:flex}
  .hero-content h1{font-size:1.8rem}
  .hero-banner{min-height:400px}
  .video-grid,.feature-grid,.expert-grid,.community-grid,.review-grid,.contact-grid{grid-template-columns:1fr}
  .section{padding:50px 0}
  .section-title h2{font-size:1.5rem}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .hero-content h1{font-size:1.5rem}
  .qr-grid{flex-direction:column;align-items:center}
}