:root{--ink:#172d44;--blue:#2363a6}
*{box-sizing:border-box}
body{margin:0;font-family:"Microsoft YaHei",system-ui,sans-serif;color:var(--ink);line-height:1.85;background:#f5f8fc}
a{color:var(--blue);text-underline-offset:4px}
a:focus-visible,button:focus-visible{outline:3px solid #efac28;outline-offset:4px}
.wrap{max-width:1060px;margin:auto;padding:0 24px}
.site-nav{background:#173c64;color:white;padding:20px 0}
.site-nav .wrap{display:flex;gap:22px;align-items:center;flex-wrap:wrap}
.site-nav a{color:white;text-decoration:none}
.brand{font-weight:bold;margin-right:auto}
.page-hero{padding:48px 0 36px;background:#eaf2fc}
h1{font-size:clamp(28px,4vw,42px);line-height:1.4}
h2{font-size:24px}
h3{font-size:20px}
.intro{font-size:18px;max-width:820px}
.eyebrow{color:#52677e;font-size:14px}
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:32px;padding-top:32px;padding-bottom:48px}
.article-body section,.contact-box{background:white;border:1px solid #dce5ef;border-radius:16px;padding:24px;margin-bottom:20px}
.article-body h2:first-child{margin-top:0}
.contact-box{height:fit-content;overflow-wrap:anywhere}
.button{display:inline-block;background:#1e5896;color:white;padding:10px 20px;border-radius:8px;text-decoration:none}
.notice,.source{font-size:14px;color:#52677e}
.faq-item{padding:16px 0;border-bottom:1px solid #e0e7ef}
.faq-item:last-child{border-bottom:0}
.faq-item h3{margin:0 0 8px}
.faq-item p{margin:0}
.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.topic-card{display:block;background:white;border:1px solid #dce5ef;border-radius:14px;padding:24px;text-decoration:none;color:#172d44}
.topic-card p{font-size:15px;color:#53677b}
.topic-card span{color:#2363a6}
.topic-card:hover{border-color:#2363a6}
.topic-section{padding:56px 0}
.site-footer{padding:30px 0;border-top:1px solid #dce5ef;font-size:14px}
.skip-link{position:absolute;left:16px;top:-100px;background:white;padding:12px;z-index:2000}
.skip-link:focus{top:12px}
.device-figure{margin:0;width:100%;padding:16px;border-radius:22px;background:#f4f5ef;border:1px solid #e1e7dd;box-shadow:0 18px 48px rgba(0,0,0,.12)}
.device-figure img{display:block;width:100%;height:auto;object-fit:contain}
.device-figure figcaption{text-align:center;font-size:14px;color:#375845;padding:12px 0 0}
.hero{padding:120px 0 64px}
.hero .hero-content{flex:0.9;min-width:0}
.hero .hero-visual{flex:1.1;min-width:0}
.hero h1{font-size:38px}
.nav-links a.nav-cta,.nav-links a.nav-cta:hover{color:#1e3c72}
.product-showcase{max-width:860px;margin:32px auto 0}
/* Larger desktop typography; mobile keeps its existing scale. */
@media(min-width:769px){
  body{font-size:18px}
  .nav-links a,.site-nav a{font-size:18px}
  .nav-logo-text{font-size:22px}
  .hero p,.intro,.cta p{font-size:20px}
  .hero-badge,.section-subtitle,.eyebrow,.device-figure figcaption{font-size:16px}
  .btn,.button{font-size:18px}
  .section-desc,.service-body > p,.service-item,.about-text,
  .about-feature-text p,.tech-card p,.process-step p,.advantage-card p,
  .contact-item-text p,.topic-card p{font-size:18px}
  .service-body h3,.topic-card h3,.advantage-card h3,.faq-item h3{font-size:24px}
  .about-feature-text h4,.tech-card h4,.process-step h4,.contact-item-text h4{font-size:20px}
  .article-body h2,.contact-box h2{font-size:28px}
  .notice,.source,.site-footer,.footer-about p,.footer-col a,.footer-bottom p{font-size:16px}
  .footer-col h4,.footer-about h3{font-size:20px}
}
@media(max-width:768px){.hero h1{font-size:30px}.hero{min-height:auto;padding:110px 0 48px}.hero .container{gap:28px}.hero .hero-content,.hero .hero-visual{flex:0 0 100%;width:100%;min-width:0}.hero .hero-visual{display:flex}.device-figure{padding:10px;border-radius:16px}}
@media(max-width:760px){.article-grid,.topic-grid{grid-template-columns:1fr}
.page-hero{padding-top:28px}
.site-nav .wrap{gap:12px;font-size:14px}
.brand{width:100%}
.article-body section{padding:20px}
}