/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'Noto Sans SC',sans-serif;color:#1e293b;line-height:1.6;background:#fff}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===== WhatsApp Float Button ===== */
.whatsapp-float{position:fixed;bottom:24px;right:24px;z-index:999}
.whatsapp-float .whatsapp-label{display:none}
.whatsapp-btn{display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:#25d366;border-radius:50%;box-shadow:0 2px 12px rgba(37,211,102,.35);transition:all .3s}
.whatsapp-btn:hover{transform:scale(1.08);box-shadow:0 4px 20px rgba(37,211,102,.5)}
.whatsapp-btn svg{width:26px;height:26px;fill:#fff}

/* ===== Language Switch ===== */
.lang-switcher{display:flex;gap:4px;margin-left:24px}
.lang-switch{font-size:.8rem;padding:4px 10px;border:1px solid #cbd5e1;border-radius:4px;background:transparent;color:#64748b;cursor:pointer;transition:all .2s;font-weight:500}
.lang-switch:hover{border-color:#2563eb;color:#2563eb}
.lang-switch.active{background:#2563eb;color:#fff;border-color:#2563eb}

/* Language display control */
[data-lang="zh"] .lang-en{display:none}
[data-lang="en"] .lang-zh{display:none}

/* ===== Header ===== */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid #e2e8f0}
.header .container{display:flex;align-items:center;justify-content:space-between;height:70px}
.header-left{display:flex;align-items:center}
.logo h1{font-size:1.4rem;font-weight:700;color:#1e40af;letter-spacing:-.5px}
.nav ul{display:flex;gap:28px}
.nav a{font-size:.9rem;font-weight:500;color:#475569;transition:color .2s;padding:8px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.active{color:#2563eb;border-bottom-color:#2563eb}
.mobile-menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.mobile-menu-btn span{display:block;width:24px;height:2px;background:#1e293b;transition:.3s}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#1e3a5f 0%,#2563eb 50%,#1e40af 100%);color:#fff;padding:100px 0;text-align:center}
.hero-content h2{font-size:2.8rem;font-weight:800;margin-bottom:16px;letter-spacing:-1px}
.hero-content p{font-size:1.2rem;opacity:.9;margin-bottom:32px;max-width:700px;margin-left:auto;margin-right:auto}
.hero-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:12px 28px;border-radius:8px;font-weight:600;font-size:.95rem;transition:all .3s;cursor:pointer;border:none}
.btn-primary{background:#2563eb;color:#fff}
.btn-primary:hover{background:#1d4ed8;transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,99,235,.3)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn-sm{padding:8px 20px;font-size:.85rem}
.btn-download{background:#059669;color:#fff}
.btn-download:hover{background:#047857;transform:translateY(-1px);box-shadow:0 4px 12px rgba(5,150,105,.3)}

/* ===== Section Common ===== */
section{padding:80px 0}
.section-title{font-size:2rem;font-weight:700;text-align:center;margin-bottom:16px;color:#0f172a}
.section-header{text-align:center;margin-bottom:48px}
.section-desc{font-size:1.05rem;color:#64748b;max-width:700px;margin:0 auto 40px;line-height:1.7;text-align:center}

/* ===== Product Categories ===== */
.product-categories{background:#f8fafc}
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.category-card{background:#fff;border-radius:12px;overflow:hidden;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,.06);transition:all .3s;border:1px solid #e2e8f0}
.category-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.1);border-color:#2563eb}
.category-img{height:220px;overflow:hidden;background:#f0f4ff}
.category-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.category-card:hover .category-img img{transform:scale(1.05)}
.category-card h3{font-size:1.25rem;font-weight:700;margin:20px 20px 12px;color:#0f172a}
.category-card p{color:#64748b;font-size:.9rem;margin:0 20px 20px;line-height:1.6}
.category-card .btn{margin-bottom:24px}

/* ===== About ===== */
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;margin-top:40px}
.about-text p{color:#475569;margin-bottom:16px;font-size:1.02rem;line-height:1.8}
.about-features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;text-align:center}
.feature{background:#f0f4ff;border-radius:12px;padding:28px 16px}
.feature-number{display:block;font-size:2rem;font-weight:800;color:#2563eb}
.feature-label{display:block;font-size:.85rem;color:#64748b;margin-top:4px}

/* ===== Factory ===== */
.factory{background:#fff}
.factory-video{margin-bottom:48px;border-radius:12px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.1)}
.factory-video video{width:100%;display:block;max-height:600px;object-fit:cover}

/* ===== Gallery ===== */
.factory-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.visitors-gallery{display:grid;grid-template-columns:2fr 1fr;gap:20px}
.gallery-item{position:relative;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);transition:all .3s;background:#f0f4ff}
.gallery-item:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.12)}
.gallery-item img{width:100%;height:280px;object-fit:cover;transition:transform .4s}
.gallery-item:hover img{transform:scale(1.03)}
.gallery-item--large img{height:400px}
.gallery-caption{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,.7));color:#fff;padding:40px 20px 16px;font-size:.95rem;font-weight:500}

/* ===== Visitors ===== */
.visitors{background:#f8fafc}

/* ===== News Section ===== */
.news{background:#fff}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.news-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);border:1px solid #e2e8f0;transition:all .3s}
.news-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.1)}
.news-card-image{height:200px;overflow:hidden;background:#f0f4ff;display:flex;align-items:center;justify-content:center}
.news-card-image img{width:100%;height:100%;object-fit:cover}
.news-card-image .news-icon{color:#94a3b8}
.news-card-body{padding:20px}
.news-card-date{font-size:.8rem;color:#94a3b8;margin-bottom:8px}
.news-card h3{font-size:1.05rem;font-weight:700;margin-bottom:8px;color:#0f172a;line-height:1.4}
.news-card p{font-size:.88rem;color:#64748b;line-height:1.6;margin-bottom:12px}
.news-card .read-more{font-size:.85rem;color:#2563eb;font-weight:600}
.news-card .read-more:hover{text-decoration:underline}
.news-more{text-align:center;margin-top:40px}

/* ===== Downloads Section ===== */
.downloads{background:#f8fafc}
.download-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:40px}
.download-card{display:flex;align-items:center;gap:20px;background:#fff;border-radius:12px;padding:24px;box-shadow:0 1px 3px rgba(0,0,0,.06);border:1px solid #e2e8f0;transition:all .3s}
.download-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.1);border-color:#059669}
.download-icon{flex-shrink:0;width:52px;height:52px;background:#ecfdf5;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#059669}
.download-info{flex:1;min-width:0}
.download-info h4{font-size:1rem;font-weight:700;color:#0f172a;margin-bottom:4px}
.download-info p{font-size:.82rem;color:#94a3b8}
.download-card .btn-sm{flex-shrink:0}

/* ===== Contact ===== */
.contact{background:#f8fafc}
.contact-content{display:grid;grid-template-columns:1fr 1fr;gap:60px;margin-top:40px}
.contact-info h3{font-size:1.3rem;margin-bottom:12px;color:#0f172a}
.contact-info>p{color:#64748b;margin-bottom:24px}
.contact-details{margin-top:24px}
.contact-item{margin-bottom:12px;color:#475569;line-height:1.6}
.contact-item strong{color:#0f172a}
.contact-form{background:#fff;padding:32px;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.form-group{margin-bottom:16px}
.form-group input,.form-group textarea{width:100%;padding:12px 16px;border:1px solid #e2e8f0;border-radius:8px;font-size:.95rem;transition:border-color .2s;font-family:inherit}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.form-group textarea{resize:vertical}

/* ===== Page Banner ===== */
.page-banner{background:linear-gradient(135deg,#1e3a5f 0%,#2563eb 100%);color:#fff;padding:60px 0;text-align:center}
.page-banner h2{font-size:2.2rem;font-weight:700;margin-bottom:8px}
.page-banner p{font-size:1.05rem;opacity:.85}

/* ===== Product Section ===== */
.product-section.alt-bg{background:#f8fafc}
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px;margin-top:32px}
.product-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);border:1px solid #e2e8f0;transition:all .3s}
.product-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.1)}
.product-image{height:260px;overflow:hidden;background:#f0f4ff}
.product-image img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.product-card:hover .product-image img{transform:scale(1.05)}
.product-info{padding:20px}
.product-info h3{font-size:1.1rem;font-weight:700;margin-bottom:8px;color:#0f172a}
.product-specs{font-size:.85rem;color:#2563eb;font-weight:500;margin-bottom:8px}
.product-desc{font-size:.9rem;color:#64748b;line-height:1.6;margin-bottom:16px}

/* ===== CTA ===== */
.cta{background:linear-gradient(135deg,#1e40af 0%,#2563eb 100%);color:#fff;text-align:center;padding:60px 0}
.cta h2{font-size:1.8rem;font-weight:700;margin-bottom:12px}
.cta p{opacity:.9;margin-bottom:24px;font-size:1.05rem}

/* ===== Footer ===== */
.footer{background:#0f172a;color:#cbd5e1;padding:60px 0 0}
.footer-content{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid #1e293b}
.footer-brand h3{color:#fff;font-size:1.3rem;margin-bottom:8px}
.footer-brand p{color:#94a3b8;font-size:.9rem}
.footer h4{color:#fff;font-size:.95rem;margin-bottom:16px}
.footer ul li{margin-bottom:8px}
.footer ul a{color:#94a3b8;font-size:.9rem;transition:color .2s}
.footer ul a:hover{color:#fff}
.footer-bottom{text-align:center;padding:24px 0;color:#64748b;font-size:.85rem}

/* ===== Responsive ===== */
@media(max-width:768px){
  .nav{display:none}
  .nav.open{display:block;position:absolute;top:70px;left:0;right:0;background:#fff;border-bottom:1px solid #e2e8f0;padding:16px 20px;z-index:99}
  .nav.open ul{flex-direction:column;gap:12px}
  .mobile-menu-btn{display:flex}
  .lang-switcher{margin-left:auto;margin-right:12px}
  .hero-content h2{font-size:2rem}
  .category-grid{grid-template-columns:1fr}
  .about-content{grid-template-columns:1fr;gap:32px}
  .about-features{grid-template-columns:repeat(3,1fr)}
  .contact-content{grid-template-columns:1fr}
  .footer-content{grid-template-columns:1fr;gap:24px}
  .product-grid{grid-template-columns:1fr}
  .factory-gallery{grid-template-columns:1fr}
  .visitors-gallery{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .download-grid{grid-template-columns:1fr}
  .gallery-item img{height:220px}
  .gallery-item--large img{height:280px}
  .factory-video video{max-height:300px}
  .whatsapp-float{bottom:16px;right:16px}
  .whatsapp-float .whatsapp-label{display:none}
}
@media(max-width:480px){
  .hero-content h2{font-size:1.6rem}
  .section-title{font-size:1.5rem}
  .hero-buttons{flex-direction:column;align-items:center}
  .about-features{grid-template-columns:1fr}
  .category-img{height:180px}
  .product-image{height:200px}
}