/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;color:#1e293b;background:#fff;line-height:1.6}

/* === Container === */
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* === Header === */
.site-header{background:#1e3a5f;color:#fff;position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;max-width:1200px;margin:0 auto}
.logo{font-family:'Montserrat',sans-serif;font-weight:800;font-size:1.4rem;color:#fff;text-decoration:none}
.main-nav{display:flex;gap:24px}
.nav-link{color:#cbd5e1;text-decoration:none;font-size:0.9rem;font-weight:500;transition:color .2s}
.nav-link:hover{color:#fff}
.nav-link.nav-cta{background:#2563eb;color:#fff;padding:8px 20px;border-radius:6px;font-weight:600}
.nav-link.nav-cta:hover{background:#1d4ed8}
.mobile-menu-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

@media(max-width:768px){
  .main-nav{display:none;flex-direction:column;position:absolute;top:60px;left:0;right:0;background:#1e3a5f;padding:16px;gap:12px}
  .main-nav.open{display:flex}
  .mobile-menu-toggle{display:block}
}

/* === Hero === */
.hero{background:linear-gradient(135deg,#1e3a5f,#2563eb);color:#fff;padding:100px 24px 80px;text-align:center}
.hero h1{font-family:'Montserrat',sans-serif;font-size:2.8rem;font-weight:800;margin-bottom:16px;line-height:1.2}
.hero p{font-size:1.15rem;max-width:680px;margin:0 auto 36px;color:#bfdbfe;line-height:1.7}
.hero-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary,.btn-secondary{display:inline-block;padding:14px 32px;border-radius:8px;font-weight:600;text-decoration:none;font-size:1rem;transition:all .2s}
.btn-primary{background:#fff;color:#1e3a5f}
.btn-primary:hover{background:#e2e8f0}
.btn-secondary{border:2px solid #fff;color:#fff}
.btn-secondary:hover{background:#fff;color:#1e3a5f}

/* === Page Banner === */
.page-banner{background:linear-gradient(135deg,#1e3a5f,#2563eb);color:#fff;padding:80px 24px 60px;text-align:center}
.page-banner h1{font-family:'Montserrat',sans-serif;font-size:2.4rem;font-weight:700;margin-bottom:12px}
.page-banner p{font-size:1.1rem;max-width:640px;margin:0 auto;color:#bfdbfe}

/* === Section === */
.section{padding:80px 24px}
.section-title{font-family:'Montserrat',sans-serif;font-size:2rem;font-weight:700;text-align:center;margin-bottom:12px}
.section-subtitle{text-align:center;color:#64748b;max-width:600px;margin:0 auto 48px;font-size:1.05rem}

/* === Value Props === */
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;max-width:1000px;margin:0 auto}
.value-card{text-align:center;padding:32px 20px;border-radius:12px;transition:box-shadow .2s}
.value-card:hover{box-shadow:0 4px 20px rgba(0,0,0,.08)}
.value-icon{font-size:2.2rem;margin-bottom:12px}
.value-card h3{font-size:1.15rem;margin-bottom:8px;color:#1e3a5f}
.value-card p{font-size:0.9rem;color:#64748b;line-height:1.6}
@media(max-width:768px){.values{grid-template-columns:1fr}}

/* === Category Grid === */
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1100px;margin:0 auto}
.category-card{border:1px solid #e2e8f0;border-radius:10px;padding:24px;text-decoration:none;transition:all .2s;display:block}
.category-card:hover{border-color:#2563eb;box-shadow:0 4px 16px rgba(37,99,235,.1)}
.category-card h3{font-size:1rem;font-weight:600;color:#1e3a5f;margin-bottom:8px}
.category-card p{font-size:0.85rem;color:#64748b;line-height:1.5}
@media(max-width:768px){.category-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.category-grid{grid-template-columns:1fr}}

/* === CTA === */
.cta-section{background:#f0f4ff;text-align:center;padding:80px 24px}
.cta-section h2{font-family:'Montserrat',sans-serif;font-size:1.6rem;margin-bottom:12px}
.cta-section p{color:#64748b;max-width:500px;margin:0 auto 28px}

/* === Content Page === */
.content-page{max-width:760px;margin:0 auto;padding:64px 24px;color:#475569;line-height:1.8;font-size:1.05rem}
.content-page h2{font-size:1.6rem;font-weight:700;color:#1e3a5f;margin:48px 0 16px}
.content-page h3{font-size:1.15rem;font-weight:600;color:#2563eb;margin:32px 0 8px}
.content-page p{margin-bottom:20px}
.content-page .btn-primary{display:inline-block;margin-top:12px}

/* === Application Cards === */
.app-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.app-card{border:1px solid #e2e8f0;border-radius:10px;padding:24px;transition:border-color .2s}
.app-card:hover{border-color:#2563eb}
.app-card h3{font-size:1.05rem;font-weight:600;color:#2563eb;margin-bottom:8px}
.app-card p{font-size:0.92rem;color:#64748b;line-height:1.6}

/* === Contact Form === */
.contact-form{max-width:640px;margin:0 auto;padding:64px 24px}
.contact-form .form-group{margin-bottom:20px}
.contact-form label{display:block;font-size:0.9rem;font-weight:500;margin-bottom:6px;color:#374151}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:12px 16px;border:1px solid #d1d5db;border-radius:8px;font-size:0.95rem;font-family:inherit;transition:border-color .2s}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.contact-form .form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.contact-form .form-row{grid-template-columns:1fr}}
.contact-info{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:640px;margin:40px auto;text-align:center}
.contact-info .info-card{border:1px solid #e2e8f0;border-radius:10px;padding:24px}
.contact-info .info-card .icon{font-size:1.8rem;margin-bottom:8px}
.contact-info .info-card h3{font-weight:600;margin-bottom:4px}
.contact-info .info-card p{font-size:0.9rem;color:#64748b}

/* === Product Placeholder === */
.product-placeholder{text-align:center;padding:60px 24px}
.product-placeholder p{color:#64748b;margin-bottom:24px;max-width:500px;margin-left:auto;margin-right:auto}

/* === Exhibition Gallery & Stone Fair Pages === */
.exhibition-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1100px;margin:0 auto}
.exhibition-card{display:block;text-decoration:none;background:#fff;border:1px solid #e2e8f0;border-radius:10px;overflow:hidden;transition:all .2s}
.exhibition-card:hover{border-color:#2563eb;box-shadow:0 4px 16px rgba(37,99,235,.1)}
.exhibition-thumb{width:100%;height:200px;background-size:cover;background-position:center}
.exhibition-info{padding:20px}
.exhibition-info h3{font-size:1.05rem;font-weight:600;color:#1e3a5f;margin-bottom:6px}
.exhibition-meta{font-size:0.82rem;color:#2563eb;margin-bottom:8px}
.exhibition-desc{font-size:0.88rem;color:#64748b;line-height:1.5}

.exhibition-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
.exhibition-gallery img{width:100%;border-radius:8px;cursor:pointer;transition:opacity .2s}
.exhibition-gallery img:hover{opacity:0.85}

.exhibition-detail-info{display:flex;gap:32px;flex-wrap:wrap;margin:32px 0;padding:24px;background:#f0f4ff;border-radius:10px}
.info-item{display:flex;flex-direction:column;gap:4px}
.info-label{font-size:0.8rem;font-weight:600;color:#64748b;text-transform:uppercase;letter-spacing:0.05em}
.info-value{font-size:1rem;font-weight:500;color:#1e3a5f}

/* Lightbox */
.lightbox-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.88);display:none;justify-content:center;align-items:center;z-index:9999;cursor:pointer}
.lightbox-overlay:target{display:flex}
.lightbox-overlay img{max-width:92%;max-height:92%;border-radius:4px;cursor:default;object-fit:contain}
.lb-close{position:fixed;top:20px;right:28px;color:#fff;font-size:2.4rem;text-decoration:none;z-index:10000;line-height:1}
.lb-close:hover{color:#94a3b8}

@media(max-width:768px){
  .exhibition-grid{grid-template-columns:1fr 1fr}
  .exhibition-gallery{grid-template-columns:1fr 1fr}
  .exhibition-detail-info{flex-direction:column;gap:16px}
}

/* === Lightbox === */
.lightbox{display:none;position:fixed;z-index:9999;left:0;top:0;width:100%;height:100%;background:rgba(0,0,0,0.9);justify-content:center;align-items:center;cursor:pointer}
.lightbox-content{max-width:90%;max-height:90%;object-fit:contain;border-radius:6px}
.lightbox-close{position:absolute;top:20px;right:40px;color:#fff;font-size:48px;font-weight:bold;cursor:pointer;z-index:10000}
.lightbox-close:hover{color:#ccc}

/* === Footer === */
.site-footer{background:#0f172a;color:#94a3b8;padding:48px 24px 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px;margin-bottom:32px}
.footer-grid h3{color:#fff;font-family:'Montserrat',sans-serif;font-size:1.2rem;margin-bottom:12px}
.footer-grid h4{color:#e2e8f0;font-size:0.95rem;margin-bottom:12px;font-weight:600}
.footer-grid p{font-size:0.85rem;line-height:1.6}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links a{color:#94a3b8;text-decoration:none;font-size:0.85rem;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-contact p{font-size:0.85rem;margin-bottom:4px}
.footer-bottom{border-top:1px solid #1e293b;padding-top:20px;text-align:center;font-size:0.8rem}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr;gap:24px}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}

@media(max-width:480px){
  .exhibition-grid{grid-template-columns:1fr}
  .exhibition-gallery{grid-template-columns:1fr}
  .hero h1{font-size:1.8rem}
  .page-banner h1{font-size:1.6rem}
  .section-title{font-size:1.5rem}
  .hero{padding:60px 16px 48px}
  .section{padding:48px 16px}
}