:root{--c-primary:#1a5fb4;--c-primary-dark:#0d3b7a;--c-accent:#ff6b00;--c-text:#333;--c-muted:#999;--c-light:#f5f7fa;--c-border:#e0e4e8;--c-white:#fff;--radius:6px;--maxw:1200px;--shadow:0 2px 12px rgba(0,0,0,.08)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;font-size:18px;line-height:1.8;color:var(--c-text);background:var(--c-white)}
a{color:var(--c-primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--c-accent)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
img{max-width:100%;height:auto;display:block}

/* Sticky header+nav as one unit */
.site-header{position:sticky;top:0;z-index:1000;background:var(--c-white);border-bottom:3px solid var(--c-primary);box-shadow:0 1px 4px rgba(0,0,0,.06)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;padding:10px 20px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:50px;width:auto}
.brand h1{font-size:20px;color:var(--c-primary-dark);letter-spacing:.5px}

/* Navigation - part of sticky header */
.navbar{background:var(--c-primary-dark)}
.nav-list{display:flex;list-style:none;gap:0}
.nav-list li a{display:block;padding:14px 22px;color:#fff;font-size:14px;font-weight:500;transition:background .2s}
.nav-list li a:hover,.nav-list li a.active{background:var(--c-primary)}
.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:22px;padding:10px 16px;cursor:pointer}

/* Hero banner */
.hero{position:relative;background:url('../images/hanyang.png') center/cover no-repeat;text-align:center;color:#fff}
.hero::after{content:'';position:absolute;inset:0;background:rgba(0,0,0,.15)}
.hero-content{position:relative;z-index:1;display:inline-block;margin:0 auto}
.bg-ccc{background:url('../images/bg-ccc.png');color:#fff;max-width:680px;margin:20px auto;padding:10px}
.bg-ccc h1{font-size:48px;font-weight:800}
.bg-ccc h2{font-size:24px}
.hero-spacer{height:200px}

/* Intro */
.intro-section{padding:40px 0;text-align:left}
.intro-section h2{font-size:32px;color:var(--c-primary-dark);margin-bottom:16px}
.intro-section p{margin:0 0 14px;color:var(--c-text);font-size:18px;text-align:justify}

/* Three cards - matching original: float-left, 290x240, hover zoom */
.cards-container{margin:30px auto}
.cards-container::after{content:'';display:block;clear:both}
.card-col{float:left;width:33.333%;padding:0 15px}
.c1{width:100%;height:240px;overflow:hidden;text-align:center;padding:60px 10px;background-size:100%;background-position:center;background-repeat:no-repeat;transition:background-size .3s linear}
.c1:hover{background-size:160%}
.c1 h4{font-size:28px;text-shadow:0 0 6px #000;color:#fff;text-transform:none}
.c1 p a{color:#fff !important;font-size:16px}
.c1_1{background-image:url('../images/hanyang-prduct.png')}
.c1_2{background-image:url('../images/hanyang-prduct-2.png')}
.c1_3{background-image:url('../images/hanyang-new2019.png')}

/* Catalog CTA - matching original .mid */
.catalog-cta{background:url('../images/hero-bottom.png') center/cover no-repeat;padding-top:200px;padding-bottom:40px;text-align:center;color:#fff;text-shadow:0 0 6px #000}
.catalog-cta h3{font-size:32px;margin-bottom:16px}
.catalog-cta .btn-catalog{display:inline-block;padding:10px 28px;background:var(--c-primary);color:#fff;border-radius:4px;font-weight:600;transition:background .2s}
.catalog-cta .btn-catalog:hover{background:var(--c-accent)}

/* Certifications */
.certifications{padding:40px 0}
.headerline{border-bottom:#187CAC solid 4px;font-size:36px;margin:0 auto;display:inline-block}
.cert-grid{display:flex;flex-wrap:wrap;padding:20px}
.cert-grid .cert-col{flex:1;text-align:center}
.cert-grid img{height:136px;width:auto;margin:0 auto}
.cert-grid h3{color:var(--c-primary);font-size:16px;margin-top:8px}

/* Page title */
.page-title{background:linear-gradient(135deg,var(--c-primary),var(--c-primary-dark));color:#fff;padding:40px 0;text-align:center}
.page-title h2{font-size:30px;margin-bottom:6px}
.crumb{font-size:13px;opacity:.85}
.crumb a{color:#fff}

/* Main */
main{padding:30px 0;min-height:50vh}

/* Product listing - 3-column grid */
.bc-row{display:flex;flex-wrap:wrap;margin-bottom:0}
.bc-col{flex:1 1 33.333%;max-width:33.333%;text-align:center;padding:10px}
.bc-col img{width:100%;max-width:350px;height:auto;margin:0 auto}
.bc-col img:hover{opacity:.85}
.bc-title{color:#007dc3;text-align:center;font-size:20px;font-weight:500;margin-top:10px}

/* Product detail sub-page - 3-column grid like original */
.sub-products{display:flex;flex-wrap:wrap;background:#f9f9f9}
.sub-product-item{flex:1 1 33.333%;max-width:33.333%;padding:15px;text-align:center}
.sub-product-item img{width:100%;max-width:350px;height:auto;margin:0 auto}
.sub-product-item .sp-title{color:#1761ab;font-size:30px;font-weight:500;margin-top:10px}
.sub-product-item .sp-desc{color:#999;font-size:14px;margin-top:5px}

/* About */
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin:24px 0}
.about-text h2{color:var(--c-primary-dark);margin-bottom:16px;font-size:24px}
.about-text p{margin-bottom:14px;color:var(--c-text)}
.video-section{margin:40px 0;text-align:center}
.video-section h2{color:var(--c-primary-dark);margin-bottom:20px;font-size:24px}
.video-section video{width:100%;max-width:1170px;margin:0 auto;border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,.15)}
.values-section{margin-top:40px}
.values-section h2{color:var(--c-primary-dark);margin-bottom:20px;font-size:24px;text-align:center}
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.value-card{background:var(--c-light);border-radius:var(--radius);padding:24px;text-align:center;transition:transform .2s}
.value-card:hover{transform:translateY(-3px)}
.value-card .icon{font-size:32px;margin-bottom:10px}
.value-card h3{color:var(--c-primary);font-size:16px;margin-bottom:8px}
.value-card p{font-size:13px;color:var(--c-muted)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin:30px 0}
.contact-form h3,.contact-info h3{color:var(--c-primary-dark);margin-bottom:16px;font-size:20px}
.contact-info{background:var(--c-light);padding:30px;border-radius:var(--radius)}
.contact-info p{margin-bottom:10px;line-height:1.8}
.contact-info strong{color:var(--c-primary)}
.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:6px;font-weight:500}
.form-control{width:100%;padding:10px 14px;border:1px solid var(--c-border);border-radius:var(--radius);font-size:14px;font-family:inherit}
.form-control:focus{outline:none;border-color:var(--c-primary)}
textarea.form-control{resize:vertical;min-height:120px}
.social-icons{display:flex;gap:12px;margin-top:20px}
.social-icons a{display:inline-block}
.social-icons img{width:36px;height:36px}

.btn{display:inline-block;padding:10px 24px;border-radius:var(--radius);font-size:14px;font-weight:600;transition:all .2s;cursor:pointer;border:none}
.btn-primary{background:var(--c-primary);color:#fff}
.btn-primary:hover{background:var(--c-primary-dark);color:#fff}

/* Footer */
.site-footer{background:var(--c-primary-dark);color:#b0c4de;padding:30px 0 16px;margin-top:40px}
.footer-nav{text-align:center;padding-bottom:16px;border-bottom:1px solid rgba(255,255,255,.15);margin-bottom:14px}
.footer-nav a{color:#b0c4de;font-size:13px;margin:0 10px}
.footer-nav a:hover{color:#fff}
.footer-info{text-align:center;font-size:12px;line-height:1.8;color:#8a9bb5}
.footer-info a{color:#8a9bb5}

@media(max-width:768px){
  .menu-toggle{display:block}
  .nav-list{display:none;flex-direction:column}
  .nav-list.show{display:flex}
  .nav-list li a{padding:10px 16px;border-bottom:1px solid rgba(255,255,255,.1)}
  .site-header .container{flex-direction:column;gap:8px;text-align:center}
  .hero h1{font-size:30px}
  .card-col{float:none;width:100%;margin-bottom:15px}
  .bc-col{flex:1 1 100%;max-width:100%}
  .sub-product-item{flex:1 1 100%;max-width:100%}
  .about-content,.contact-grid{grid-template-columns:1fr}
  .values-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{flex-direction:column}
}
@media(max-width:480px){
  .values-grid{grid-template-columns:1fr}
}