/* =========================================
   铭赞网络® | SEO优化 - 响应式样式
   断点:1200 / 992 / 768 / 576
   ========================================= */

/* ============= 大屏 1200px 以下 ============= */
@media (max-width:1200px){
  .container{padding:0 20px}
  .nav-list{gap:2px}
  .nav-link{padding:8px 10px;font-size:14px}
  .hero-title{font-size:48px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:18px}
  .section{padding:80px 0}
  .section-title{font-size:36px}
  .service-core,.google-stack,.advantage-grid,.case-grid,.process-list{grid-template-columns:repeat(2,1fr)}
  .baidu-grid{grid-template-columns:1.4fr 1fr;gap:32px}
  .geo-grid{grid-template-columns:1fr 1.4fr;gap:32px}
  .related-grid{grid-template-columns:repeat(5,1fr)}
  .footer-inner{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
  .timeline{grid-template-columns:repeat(7,1fr);gap:0}
}

/* ============= 平板 992px 以下 ============= */
@media (max-width:992px){
  :root{--header-h:64px}
  .nav-list{
    position:fixed;top:var(--header-h);left:0;right:0;
    background:linear-gradient(180deg,var(--navy) 0%,#061536 100%);
    flex-direction:column;align-items:stretch;
    padding:20px;gap:4px;
    border-top:1px solid rgba(255,255,255,.1);
    transform:translateY(-150%);transition:transform .35s ease;
    z-index:99;max-height:calc(100vh - var(--header-h));overflow-y:auto;
  }
  .nav-list.open{transform:translateY(0)}
  .nav-list li{width:100%}
  .nav-link{display:block;padding:14px 18px;font-size:15px;border-bottom:1px solid rgba(255,255,255,.05)}
  .nav-link.active::after{display:none}
  .nav-link.active{background:rgba(255,214,107,.08)}
  .nav-cta{margin-top:10px;text-align:center}
  .nav-toggle{display:flex}

  .hero{padding:60px 0 100px}
  .hero-title{font-size:42px;line-height:1.3}
  .title-line-sub{font-size:.5em}
  .hero-desc{font-size:16px}
  .hero-stats{grid-template-columns:repeat(2,1fr);padding:22px 24px;gap:18px}
  .hero-stats .num{font-size:32px}

  .section{padding:64px 0}
  .section-head{margin-bottom:48px}
  .section-title{font-size:32px}
  .section-eyebrow{font-size:12px;letter-spacing:1.5px}

  .service-card{padding:30px 24px}
  .service-card h3{font-size:20px}
  .baidu-grid{grid-template-columns:1fr;gap:32px}
  .baidu-side-card{position:static}
  .baidu-features{grid-template-columns:1fr;gap:18px}
  .geo-grid{grid-template-columns:1fr;gap:24px}
  .geo-platforms,.geo-methods{padding:28px 24px}
  .geo-platforms ul{grid-template-columns:1fr}

  .timeline{grid-template-columns:repeat(4,1fr);gap:32px 16px;margin-bottom:56px}
  .timeline::before{display:none}
  .tl-item{padding:0;text-align:left;display:flex;gap:14px;align-items:flex-start}
  .tl-year{margin:0;flex-shrink:0}
  .tl-item-now .tl-year{animation:none}

  .contact-grid{grid-template-columns:1fr;gap:32px}
  .contact-qr{order:-1}

  .related-grid{grid-template-columns:repeat(4,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr;gap:32px}
}

/* ============= 平板 768px 以下 ============= */
@media (max-width:768px){
  .container{padding:0 16px}
  :root{--header-h:60px}
  .topbar-inner{height:var(--header-h)}
  .logo-brand{font-size:20px}
  .logo-keyword{font-size:15px}
  .logo-divider{margin:0 2px}
  .nav-list{top:var(--header-h)}

  .hero{padding:48px 0 80px}
  .hero-title{font-size:32px;line-height:1.35}
  .title-line-sub{font-size:.55em;margin-top:10px}
  .hero-desc{font-size:15px;line-height:1.8;margin-bottom:28px}
  .hero-cta{flex-direction:column;align-items:stretch;gap:12px;margin-bottom:40px}
  .btn{padding:12px 24px;font-size:14px}
  .hero-stats{grid-template-columns:repeat(2,1fr);padding:20px 18px;gap:14px;max-width:none}
  .hero-stats .num{font-size:26px}
  .hero-stats em{font-size:12px}
  .hero-stats small{font-size:11.5px}

  .section{padding:48px 0}
  .section-head{margin-bottom:36px}
  .section-title{font-size:26px;line-height:1.35}
  .section-title{padding-bottom:14px}
  .section-desc{font-size:14.5px}
  .section-eyebrow{font-size:11.5px;letter-spacing:1.5px;padding:4px 12px}

  .service-core,.service-extended,.google-stack,.advantage-grid,.case-grid,.process-list{grid-template-columns:1fr;gap:16px}
  .service-card{padding:26px 22px}
  .service-num{font-size:36px;top:18px;right:22px}
  .service-icon{width:50px;height:50px;margin-bottom:18px}
  .service-icon svg{width:30px;height:30px}
  .service-card h3{font-size:18px;margin-bottom:10px}
  .service-mini{padding:20px 18px}
  .service-mini h4{font-size:16px}

  .baidu-feature,.gs-item{padding:22px 20px}
  .bf-num,.gs-dot{margin-bottom:12px}
  .baidu-feature h4,.gs-item h4{font-size:16px;margin-bottom:8px}
  .baidu-side-card{padding:28px 24px}
  .baidu-side-card h4{font-size:20px}

  .geo-platforms,.geo-methods{padding:24px 20px}
  .geo-platforms h4,.geo-methods h4{font-size:18px;margin-bottom:18px}
  .geo-platforms li{font-size:13px;padding:8px 12px}
  .geo-methods li{padding:16px 18px}
  .geo-methods li b{font-size:15px}

  .timeline{grid-template-columns:1fr;gap:18px;margin-bottom:40px}
  .adv-card{padding:24px 22px}
  .adv-num{font-size:26px;margin-bottom:10px}
  .adv-card h4{font-size:16px}

  .case-card{padding:24px 20px}
  .case-card h4{font-size:16px}
  .case-card p{font-size:13.5px}

  .process-step{padding:24px 20px}
  .process-step h4{font-size:16px}

  .faq-item summary{padding:18px 20px;font-size:15px}
  .faq-body{padding:0 20px 20px;font-size:14px}
  .faq-body{padding-top:18px}
  .faq-toggle{width:24px;height:24px}
  .faq-toggle::before{width:10px}
  .faq-toggle::after{height:10px}
  .faq-table{font-size:12.5px}
  .faq-table th,.faq-table td{padding:8px 10px}

  .contact-cards{grid-template-columns:1fr;gap:12px}
  .contact-card{padding:16px 18px;gap:14px}
  .cc-icon{width:40px;height:40px}
  .cc-icon svg{width:20px;height:20px}
  .cc-info span{font-size:11.5px}
  .cc-info a,.cc-info em{font-size:14.5px}
  .qr-frame{padding:14px}
  .qr-frame img{width:170px;height:170px}
  .qr-tip{font-size:13px}

  .related-grid{grid-template-columns:repeat(2,1fr);gap:8px}
  .related-grid li a{padding:11px 8px;font-size:13px;min-height:42px}

  .footer{padding:48px 0 20px}
  .footer-inner{grid-template-columns:1fr;gap:32px;padding-bottom:32px}
  .footer-col h5{font-size:14.5px;margin-bottom:14px}
  .footer-copy{font-size:12px;padding-top:18px}
  .footer-copy p{line-height:1.8}

  .back-to-top{width:42px;height:42px;right:14px;bottom:14px;font-size:18px}
}

/* ============= 手机 576px 以下 ============= */
@media (max-width:576px){
  .hero{padding:36px 0 64px}
  .hero-title{font-size:26px;line-height:1.4}
  .hero-tag{font-size:12px;padding:5px 12px;margin-bottom:18px}
  .hero-desc{font-size:14.5px}
  .hero-stats{grid-template-columns:1fr 1fr;gap:10px;padding:16px}
  .hero-stats li{align-items:center;text-align:center}
  .hero-stats .num{font-size:24px}
  .hero-stats em{font-size:11.5px}
  .hero-stats small{font-size:11px}

  .section{padding:40px 0}
  .section-title{font-size:22px}
  .section-eyebrow{font-size:11px}

  .service-card{padding:22px 18px}
  .service-num{font-size:30px}
  .service-card h3{font-size:17px}
  .service-card p,.service-list li,.service-mini p{font-size:13px}
  .geo-platforms ul{grid-template-columns:1fr;gap:8px}

  .qr-frame img{width:150px;height:150px}

  .related-grid{grid-template-columns:1fr 1fr}
}