/* 草莓视频 原创样式 - 暗色科技风+橙色活力 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-primary:#0a0e1a;--bg-secondary:#111827;--bg-card:#1a2035;
  --accent:#ff6b35;--accent-hover:#ff8c5a;--teal:#4ecdc4;--gold:#ffe66d;
  --text-main:#e8eaf0;--text-sub:#8b95a5;--text-dark:#0a0e1a;
  --radius:10px;--shadow:0 4px 24px rgba(0,0,0,.35);
  --max-w:1200px;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg-primary);color:var(--text-main);line-height:1.7;overflow-x:hidden}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent-hover)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}
em{font-style:normal;color:var(--accent)}

/* Header */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(10,14,26,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,107,53,.15);transition:background .3s}
.header-inner{max-width:var(--max-w);margin:0 auto;padding:0 20px;display:flex;align-items:center;height:64px;gap:20px}
.logo-link{flex-shrink:0}
.logo-img{height:40px;width:auto}
.main-nav{display:flex;gap:6px;flex:1}
.main-nav a{color:var(--text-sub);font-size:.9rem;padding:6px 12px;border-radius:6px;transition:all .2s;white-space:nowrap}
.main-nav a:hover,.main-nav a.nav-active{color:var(--text-main);background:rgba(255,107,53,.12)}
.search-box{display:flex;gap:0;flex-shrink:0}
.search-box input{background:var(--bg-card);border:1px solid rgba(255,107,53,.2);color:var(--text-main);padding:6px 14px;border-radius:6px 0 0 6px;font-size:.85rem;width:180px;outline:none;transition:border-color .2s}
.search-box input:focus{border-color:var(--accent)}
.search-box button{background:var(--accent);color:#fff;border:none;padding:6px 16px;border-radius:0 6px 6px 0;cursor:pointer;font-size:.85rem;transition:background .2s}
.search-box button:hover{background:var(--accent-hover)}
.mobile-menu-btn{display:none;background:none;border:none;color:var(--text-main);font-size:1.5rem;cursor:pointer}

/* Hero */
.hero-section{position:relative;height:520px;margin-top:64px;overflow:hidden}
.hero-slides{position:relative;height:100%}
.hero-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity .8s ease}
.hero-slide.active{opacity:1}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,14,26,.85) 0%,rgba(10,14,26,.5) 100%)}
.hero-content{position:relative;z-index:2;max-width:var(--max-w);margin:0 auto;padding:0 20px;display:flex;flex-direction:column;justify-content:center;height:100%}
.hero-content h1,.hero-content h2{font-size:2.6rem;font-weight:800;margin-bottom:16px;line-height:1.3}
.hero-desc{font-size:1.1rem;color:var(--text-sub);max-width:640px;margin-bottom:28px}
.hero-btns{display:flex;gap:14px}
.btn-primary{background:var(--accent);color:#fff;padding:12px 32px;border-radius:8px;font-weight:600;transition:all .2s;display:inline-block}
.btn-primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px)}
.btn-outline{border:2px solid var(--teal);color:var(--teal);padding:10px 30px;border-radius:8px;font-weight:600;transition:all .2s;display:inline-block}
.btn-outline:hover{background:var(--teal);color:var(--text-dark)}
.hero-dots{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.dot{width:12px;height:12px;border-radius:50%;border:2px solid var(--accent);background:transparent;cursor:pointer;transition:all .3s}
.dot.active{background:var(--accent)}

/* Sections */
.section-block{padding:72px 0}
.section-alt{background:var(--bg-secondary)}
.section-title{font-size:1.9rem;font-weight:700;text-align:center;margin-bottom:12px}
.section-desc{text-align:center;color:var(--text-sub);max-width:680px;margin:0 auto 40px;font-size:.95rem}

/* Tag Filter */
.tag-filter{display:flex;justify-content:center;gap:10px;margin-bottom:32px;flex-wrap:wrap}
.tag{background:var(--bg-card);color:var(--text-sub);border:1px solid rgba(255,107,53,.15);padding:6px 18px;border-radius:20px;cursor:pointer;font-size:.85rem;transition:all .2s}
.tag:hover,.tag.active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* Video Grid */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-grid-3{grid-template-columns:repeat(3,1fr)}
.video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;transition:all .3s;display:block;color:var(--text-main)}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);color:var(--text-main)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:52px;height:52px;background:rgba(255,107,53,.85);border-radius:50%;opacity:0;transition:opacity .3s;display:flex;align-items:center;justify-content:center}
.play-btn::after{content:"";border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.video-tag{position:absolute;top:8px;left:8px;background:var(--accent);color:#fff;padding:2px 10px;border-radius:4px;font-size:.75rem}
.video-info{padding:14px}
.video-info h3{font-size:.9rem;font-weight:600;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-stats{display:flex;gap:12px;font-size:.75rem;color:var(--text-sub)}

/* Service Grid */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{background:var(--bg-card);padding:32px 24px;border-radius:var(--radius);text-align:center;transition:all .3s;border:1px solid rgba(255,107,53,.08)}
.service-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:var(--shadow)}
.service-icon{font-size:2.4rem;margin-bottom:16px}
.service-card h4{font-size:1rem;margin-bottom:10px;color:var(--accent)}
.service-card p{font-size:.85rem;color:var(--text-sub);line-height:1.6}

/* AI Grid */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;transition:all .3s}
.ai-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.ai-card img{width:100%;height:200px;object-fit:cover}
.ai-card h3{font-size:1rem;padding:16px 16px 8px;color:var(--teal)}
.ai-card p{font-size:.85rem;padding:0 16px 16px;color:var(--text-sub)}

/* Community Grid */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{background:var(--bg-card);padding:28px 20px;border-radius:var(--radius);text-align:center;transition:all .3s;border:1px solid rgba(78,205,196,.08)}
.community-card:hover{border-color:var(--teal);transform:translateY(-4px)}
.community-icon{font-size:2.2rem;margin-bottom:14px}
.community-card h4{font-size:.95rem;margin-bottom:8px;color:var(--teal)}
.community-card p{font-size:.83rem;color:var(--text-sub)}

/* Expert Grid */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:var(--bg-card);padding:28px 20px;border-radius:var(--radius);text-align:center;transition:all .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 14px;border:3px solid var(--accent)}
.expert-card h4{font-size:1rem;margin-bottom:4px}
.expert-role{color:var(--accent);font-size:.85rem;margin-bottom:10px}
.expert-card p:last-of-type{font-size:.82rem;color:var(--text-sub);margin-bottom:14px}
.expert-links{display:flex;gap:10px;justify-content:center}
.expert-links a{font-size:.8rem;padding:4px 14px;border:1px solid var(--accent);border-radius:4px;color:var(--accent);transition:all .2s}
.expert-links a:hover{background:var(--accent);color:#fff}

/* Partner Wall */
.partner-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.partner-item{background:var(--bg-card);padding:20px;border-radius:var(--radius);text-align:center;font-size:.95rem;color:var(--text-sub);border:1px solid rgba(255,107,53,.08);transition:all .2s}
.partner-item:hover{border-color:var(--accent);color:var(--text-main)}

/* How-To */
.howto-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.howto-step{background:var(--bg-card);padding:28px 20px;border-radius:var(--radius);text-align:center;position:relative}
.step-num{width:48px;height:48px;background:linear-gradient(135deg,var(--accent),var(--gold));color:var(--text-dark);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.4rem;font-weight:800;margin:0 auto 16px}
.howto-step h4{font-size:.95rem;margin-bottom:10px;color:var(--text-main)}
.howto-step p{font-size:.83rem;color:var(--text-sub)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid rgba(255,107,53,.1);margin-bottom:4px}
.faq-q{width:100%;background:none;border:none;color:var(--text-main);padding:18px 40px 18px 0;font-size:1rem;text-align:left;cursor:pointer;position:relative;font-weight:600;transition:color .2s}
.faq-q:hover{color:var(--accent)}
.faq-q::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);font-size:1.4rem;color:var(--accent);transition:transform .3s}
.faq-item.open .faq-q::after{transform:translateY(-50%) rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq-item.open .faq-a{max-height:300px}
.faq-a p{padding:0 0 18px;font-size:.9rem;color:var(--text-sub);line-height:1.7}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--bg-card);padding:24px;border-radius:var(--radius);border-left:3px solid var(--accent)}
.review-stars{color:var(--gold);font-size:1.1rem;margin-bottom:12px}
.review-card p{font-size:.88rem;color:var(--text-sub);line-height:1.7;margin-bottom:14px}
.review-author{font-size:.8rem;color:var(--text-sub)}
.review-author strong{color:var(--text-main)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.contact-company,.contact-community{background:var(--bg-card);border-radius:var(--radius);overflow:hidden}
.contact-company img,.contact-community img{width:100%;height:220px;object-fit:cover}
.contact-company h4,.contact-community h4{padding:18px 20px 10px;font-size:1.05rem;color:var(--accent)}
.contact-company ul,.contact-community ul{list-style:none;padding:0 20px 20px}
.contact-company li,.contact-community li{padding:6px 0;font-size:.88rem;color:var(--text-sub);border-bottom:1px solid rgba(255,255,255,.04)}

/* Footer */
.site-footer{background:var(--bg-secondary);border-top:1px solid rgba(255,107,53,.1);padding:48px 0 0}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.06)}
.footer-brand p{color:var(--text-sub);font-size:.88rem;margin-top:12px}
.footer-nav{display:flex;flex-direction:column;gap:8px}
.footer-nav h5{color:var(--text-main);margin-bottom:8px;font-size:.95rem}
.footer-nav a{color:var(--text-sub);font-size:.85rem}
.footer-nav a:hover{color:var(--accent)}
.footer-qrcodes{display:flex;gap:20px}
.qr-item{text-align:center}
.qr-item img{width:100px;height:100px;border-radius:6px;margin-bottom:6px}
.qr-item span{font-size:.75rem;color:var(--text-sub)}
.footer-share{padding:20px 0;text-align:center;display:flex;justify-content:center;gap:16px;align-items:center}
.footer-share span{color:var(--text-sub);font-size:.88rem}
.footer-share a{color:var(--text-sub);padding:4px 12px;border:1px solid rgba(255,255,255,.1);border-radius:4px;font-size:.82rem;transition:all .2s}
.footer-share a:hover{border-color:var(--accent);color:var(--accent)}
.footer-bottom{text-align:center;padding:20px 0;color:var(--text-sub);font-size:.8rem}

/* 内页通用 */
.page-hero{background:linear-gradient(135deg,var(--bg-primary),var(--bg-secondary));padding:100px 0 48px;text-align:center;margin-top:64px}
.page-hero h1{font-size:2rem;margin-bottom:12px}
.page-hero p{color:var(--text-sub);max-width:600px;margin:0 auto}
.breadcrumb{padding:14px 0;font-size:.82rem;color:var(--text-sub)}
.breadcrumb a{color:var(--accent)}
.page-content{padding:40px 0 72px}

/* 视频详情页 */
.video-detail-player{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;aspect-ratio:16/9;position:relative;margin-bottom:24px}
.video-detail-player img{width:100%;height:100%;object-fit:cover}
.video-detail-player .play-btn{opacity:1;width:72px;height:72px}
.video-detail-player .play-btn::after{border-width:14px 0 14px 24px}
.video-detail-info h1{font-size:1.5rem;margin-bottom:12px}
.video-detail-stats{display:flex;gap:20px;color:var(--text-sub);font-size:.88rem;margin-bottom:20px}
.video-detail-desc{color:var(--text-sub);font-size:.92rem;line-height:1.8;margin-bottom:32px}
.related-videos h3{font-size:1.2rem;margin-bottom:20px}

/* 响应式 */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-grid{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:64px;left:0;width:100%;background:var(--bg-primary);flex-direction:column;padding:16px;border-bottom:1px solid rgba(255,107,53,.15)}
  .main-nav.open{display:flex}
  .mobile-menu-btn{display:block}
  .search-box{display:none}
  .hero-section{height:400px}
  .hero-content h1,.hero-content h2{font-size:1.6rem}
  .hero-desc{font-size:.9rem}
  .section-title{font-size:1.4rem}
  .video-grid,.video-grid-3{grid-template-columns:repeat(2,1fr)}
  .service-grid,.ai-grid,.community-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .partner-wall{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr}
  .footer-qrcodes{justify-content:center}
}
@media(max-width:480px){
  .video-grid,.video-grid-3{grid-template-columns:1fr}
  .service-grid,.ai-grid,.community-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .howto-grid{grid-template-columns:1fr}
  .partner-wall{grid-template-columns:1fr}
  .hero-btns{flex-direction:column;gap:10px}
}