/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;color:#1a1a1a;background:#fff;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img,video{max-width:100%;height:auto;display:block}

/* ===== Colors ===== */
:root{
  --blue:#0052d9;
  --blue-dark:#003da6;
  --blue-light:#e8f0fe;
  --blue-bg:#f0f5ff;
  --white:#fff;
  --black:#111;
  --gray-50:#fafafa;
  --gray-100:#f5f5f5;
  --gray-200:#e5e5e5;
  --gray-400:#999;
  --gray-600:#666;
  --gray-800:#333;
  --shadow-sm:0 1px 3px rgba(0,0,0,.06);
  --shadow-md:0 4px 20px rgba(0,0,0,.08);
  --shadow-lg:0 10px 40px rgba(0,0,0,.1);
  --shadow-xl:0 20px 60px rgba(0,0,0,.12);
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:20px;
  --radius-xl:28px;
  --transition:all .3s cubic-bezier(.25,.8,.25,1);
}

.container{max-width:1240px;margin:0 auto;padding:0 30px}

/* ===== Header ===== */
.header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);transition:var(--transition)}
.header.scrolled{background:rgba(255,255,255,.98);box-shadow:0 1px 20px rgba(0,0,0,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:8px}
.logo img{height:42px;width:auto;object-fit:contain;transition:var(--transition)}
.footer .logo img{height:48px}
.nav{display:flex;align-items:center;gap:2px}
.nav a{position:relative;padding:8px 16px;font-size:.9rem;font-weight:500;color:var(--gray-800);border-radius:8px;transition:var(--transition)}
.nav a:hover,.nav a.active{color:var(--blue);background:var(--blue-light)}
.lang-switch{display:flex;margin-left:16px;border:1.5px solid var(--blue);border-radius:20px;overflow:hidden}
.lang-switch button{padding:5px 10px;border:none;background:transparent;cursor:pointer;font-size:.75rem;font-weight:600;color:var(--blue);transition:var(--transition);white-space:nowrap}
.lang-switch button.active{background:var(--blue);color:var(--white)}
.menu-btn{display:none;cursor:pointer;padding:4px}
.menu-btn span{display:block;width:22px;height:2px;background:var(--black);margin:5px 0;border-radius:2px;transition:var(--transition)}
.menu-btn.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.menu-btn.active span:nth-child(2){opacity:0}
.menu-btn.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(0,30,80,.65) 0%,rgba(0,20,60,.45) 50%,rgba(0,40,100,.55) 100%)}
.hero-content{position:relative;z-index:2;max-width:680px;padding-top:80px}
.hero-tag{display:inline-block;padding:6px 18px;background:rgba(255,255,255,.15);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.25);border-radius:20px;color:rgba(255,255,255,.95);font-size:.8rem;font-weight:600;letter-spacing:.04em;margin-bottom:24px}
.hero-content h1{font-size:3.2rem;font-weight:800;color:#fff;line-height:1.15;margin-bottom:20px;letter-spacing:-.02em}
.hero-content p{font-size:1.08rem;color:rgba(255,255,255,.85);line-height:1.75;margin-bottom:36px;max-width:520px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{padding:14px 32px;border-radius:30px;font-size:.95rem;font-weight:600;cursor:pointer;transition:var(--transition);display:inline-flex;align-items:center;gap:8px;border:none;line-height:1}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 8px 25px rgba(0,82,217,.35)}
.btn-outline{border:2px solid #fff;color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:var(--blue);transform:translateY(-2px)}
.btn-white{background:#fff;color:var(--blue)}
.btn-white:hover{background:var(--blue-light);transform:translateY(-2px);box-shadow:0 8px 25px rgba(0,0,0,.1)}

/* ===== Section Common ===== */
.section{padding:100px 0}
.section-sm{padding:60px 0}
.section-label{display:inline-block;font-size:.78rem;font-weight:700;color:var(--blue);letter-spacing:.08em;text-transform:uppercase;margin-bottom:12px}
.section-title{font-size:2.4rem;font-weight:800;color:var(--black);line-height:1.2;letter-spacing:-.02em;margin-bottom:14px}
.section-subtitle{font-size:1.05rem;color:var(--gray-600);line-height:1.7;max-width:560px}
.section-center{text-align:center}
.section-center .section-subtitle{margin:0 auto 50px}

/* ===== Poster Banners ===== */
.poster-banner{position:relative;height:500px;overflow:hidden;border-radius:var(--radius-xl);margin:40px 0}
.poster-banner img{width:100%;height:100%;object-fit:cover}
.poster-banner .overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:60px}
.poster-banner .overlay h2{font-size:2.2rem;font-weight:800;color:#fff;margin-bottom:12px}
.poster-banner .overlay p{font-size:1.05rem;color:rgba(255,255,255,.85);max-width:500px}
.poster-dark .overlay{background:linear-gradient(90deg,rgba(0,0,0,.55),transparent)}
.poster-blue .overlay{background:linear-gradient(90deg,rgba(0,40,100,.65),transparent)}

/* ===== Features Grid ===== */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:50px}
.feature-card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius-lg);padding:40px 30px;transition:var(--transition);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--blue);transform:scaleX(0);transform-origin:left;transition:transform .4s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.feature-card:hover::before{transform:scaleX(1)}
.feature-icon{width:56px;height:56px;border-radius:14px;background:var(--blue-light);display:flex;align-items:center;justify-content:center;font-size:1.6rem;margin-bottom:20px}
.feature-card h4{font-size:1.15rem;font-weight:700;color:var(--black);margin-bottom:10px}
.feature-card p{font-size:.92rem;color:var(--gray-600);line-height:1.7}

/* ===== Stats ===== */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:50px}
.stat-item{text-align:center;padding:30px 20px;background:var(--blue-bg);border-radius:var(--radius-lg)}
.stat-number{font-size:2.4rem;font-weight:800;color:var(--blue);line-height:1.1}
.stat-label{font-size:.88rem;color:var(--gray-600);margin-top:6px}

/* ===== Product Section ===== */
.product-highlight{display:flex;align-items:center;gap:60px;margin-top:50px}
.product-highlight.reverse{flex-direction:row-reverse}
.product-image{flex:1;border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-lg)}
.product-image img{width:100%;height:400px;object-fit:cover}
.product-info{flex:1}
.product-info .badge{display:inline-block;padding:5px 14px;background:var(--blue-light);color:var(--blue);border-radius:20px;font-size:.78rem;font-weight:600;margin-bottom:14px}
.product-info h3{font-size:1.6rem;font-weight:700;color:var(--black);margin-bottom:12px}
.product-info p{font-size:.95rem;color:var(--gray-600);line-height:1.8;margin-bottom:20px}
.specs-pills{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}
.spec-pill{padding:6px 16px;background:var(--gray-100);border-radius:20px;font-size:.82rem;color:var(--gray-800);font-weight:500}
.product-info .btn-primary{margin-top:8px}

/* ===== Product Cards Grid ===== */
.products-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:50px}
.product-card{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--gray-200);transition:var(--transition)} 
.product-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl);border-color:transparent}
.product-card-img{height:250px;overflow:hidden;position:relative}
.product-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.product-card:hover .product-card-img img{transform:scale(1.05)}
.product-card-img .tag{position:absolute;top:14px;left:14px;padding:4px 12px;background:var(--blue);color:#fff;border-radius:20px;font-size:.72rem;font-weight:700}
.product-card-body{padding:24px}
.product-card-body h4{font-size:1.15rem;font-weight:700;color:var(--black);margin-bottom:6px}
.product-card-body .sub{font-size:.85rem;color:var(--gray-400);margin-bottom:14px}
.product-card-body .features-list{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.product-card-body .features-list li{font-size:.85rem;color:var(--gray-600);display:flex;align-items:center;gap:6px}
.product-card-body .features-list li::before{content:'✓';color:var(--blue);font-weight:700}
.product-card-body .price{font-size:1.3rem;font-weight:700;color:var(--blue)}
.product-card-body .price small{font-size:.8rem;color:var(--gray-400);font-weight:400}

/* ===== Tech Specs Table ===== */
.table-wrap{overflow-x:auto;margin-top:40px;border-radius:var(--radius-lg);border:1px solid var(--gray-200)}
.specs-table{width:100%;border-collapse:collapse;font-size:.88rem}
.specs-table thead th{background:var(--blue);color:#fff;padding:14px 18px;text-align:left;font-weight:600;font-size:.88rem;white-space:nowrap}
.specs-table thead th:first-child{border-radius:var(--radius-lg) 0 0 0}
.specs-table thead th:last-child{border-radius:0 var(--radius-lg) 0 0}
.specs-table td{padding:12px 18px;border-bottom:1px solid var(--gray-100);color:var(--gray-800)}
.specs-table tr:nth-child(even) td{background:var(--gray-50)}
.specs-table tr:hover td{background:var(--blue-light)}
.specs-table .highlight td{background:var(--blue-bg);font-weight:600}

/* ===== Cert Badges ===== */
.certs-row{display:flex;justify-content:center;gap:40px;margin-top:40px;flex-wrap:wrap}
.cert-badge{text-align:center;padding:24px 30px;background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius-md);min-width:140px;transition:var(--transition)}
.cert-badge:hover{box-shadow:var(--shadow-md);border-color:var(--blue)}
.cert-badge .cert-icon{font-size:2.5rem;margin-bottom:8px}
.cert-badge .cert-name{font-size:.85rem;font-weight:600;color:var(--gray-800)}

/* ===== Policy Pages ===== */
.page-hero{background:linear-gradient(135deg,var(--blue-bg) 0%,#dce8fb 100%);padding:110px 0 60px;margin-top:0}
.page-hero.bg-img{background-size:cover;background-position:center;position:relative}
.page-hero.bg-img::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(234,243,255,.88) 0%,rgba(220,232,251,.85) 100%);z-index:0}
.page-hero.bg-img .container{position:relative;z-index:1}
.page-hero.dark{background:linear-gradient(135deg,#001a3d 0%,#002d6e 100%);color:#fff}
.page-hero.dark .section-subtitle{color:rgba(255,255,255,.7)}
.page-hero.dark .section-title{color:#fff}
.policy-content{padding:60px 0;max-width:860px}
.policy-content h2{font-size:1.5rem;font-weight:700;color:var(--blue-dark);margin:36px 0 14px;padding-bottom:10px;border-bottom:2px solid var(--blue-light)}
.policy-content h3{font-size:1.15rem;font-weight:600;color:var(--blue-dark);margin:24px 0 10px}
.policy-content p{margin-bottom:12px;line-height:1.85;color:var(--gray-800)}
.policy-content ul{padding-left:20px;margin-bottom:14px}
.policy-content ul li{margin-bottom:6px;line-height:1.8;color:var(--gray-800);list-style:disc}
.policy-content table{width:100%;border-collapse:collapse;margin:20px 0;border:1px solid var(--gray-200);border-radius:var(--radius-md);overflow:hidden}
.policy-content table th{background:var(--blue-dark);color:#fff;padding:12px 18px;text-align:left;font-size:.88rem;font-weight:600}
.policy-content table td{padding:10px 18px;border-bottom:1px solid var(--gray-100);font-size:.9rem}
.policy-content table tr:nth-child(even) td{background:var(--gray-50)}
.alert-box{padding:24px 28px;background:var(--blue-bg);border-radius:var(--radius-md);border-left:4px solid var(--blue);margin:20px 0}
.alert-box p{color:var(--gray-800);line-height:1.8;margin-bottom:4px}

/* ===== CTA Section ===== */
.cta-section{background:var(--blue);position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;top:-80px;right:-80px;width:300px;height:300px;background:rgba(255,255,255,.05);border-radius:50%}
.cta-section::after{content:'';position:absolute;bottom:-100px;left:-60px;width:250px;height:250px;background:rgba(255,255,255,.04);border-radius:50%}
.cta-inner{position:relative;z-index:1;text-align:center;color:#fff;padding:80px 0}
.cta-inner h2{font-size:2.2rem;font-weight:800;margin-bottom:12px}
.cta-inner p{font-size:1.05rem;opacity:.85;margin-bottom:30px}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px}
.contact-card{text-align:center;padding:36px 24px;background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius-lg);transition:var(--transition)}
.contact-card:hover{box-shadow:var(--shadow-lg);border-color:transparent;transform:translateY(-4px)}
.contact-card .icon{font-size:2.2rem;margin-bottom:14px}
.contact-card h4{font-size:1rem;font-weight:700;color:var(--black);margin-bottom:6px}
.contact-card p{font-size:.9rem;color:var(--gray-600)}

/* ===== Footer ===== */
.footer{background:#001430;color:rgba(255,255,255,.7);padding:70px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:50px}
.footer col h4{color:#fff;font-size:1rem;font-weight:700;margin-bottom:18px}
.footer-col p,.footer-col li,.footer-col a{font-size:.88rem;line-height:2;margin-bottom:2px;transition:var(--transition)}
.footer-col a:hover{color:var(--blue-light)}
.footer-col .logo{color:#fff;margin-bottom:14px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.82rem}

/* ===== Back to Top ===== */
.btt{position:fixed;bottom:32px;right:32px;width:48px;height:48px;background:var(--blue);color:#fff;border:none;border-radius:50%;cursor:pointer;font-size:1.2rem;display:none;align-items:center;justify-content:center;z-index:999;box-shadow:0 4px 16px rgba(0,82,217,.3);transition:var(--transition)}
.btt:hover{background:var(--blue-dark);transform:translateY(-3px)}
.btt.show{display:flex}

/* ===== Animations ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.animate{opacity:0;transform:translateY(30px);transition:all .6s cubic-bezier(.25,.8,.25,1)}
.animate.visible{opacity:1;transform:translateY(0)}

/* ===== Product Gallery ===== */
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:50px}
.gallery-grid .gallery-item{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--gray-200);transition:var(--transition)}
.gallery-grid .gallery-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-xl);border-color:transparent}
.gallery-grid .gallery-item .img-wrap{aspect-ratio:4/3;overflow:hidden;position:relative;background:var(--gray-50)}
.gallery-grid .gallery-item .img-wrap img{width:100%;height:100%;object-fit:contain;transition:transform .5s;padding:12px}
.gallery-grid .gallery-item:hover .img-wrap img{transform:scale(1.05)}
.gallery-grid .gallery-item .gallery-caption{padding:14px 16px;text-align:center;border-top:1px solid var(--gray-100)}
.gallery-grid .gallery-item .gallery-caption h4{font-size:.95rem;font-weight:600;color:var(--black);margin-bottom:4px}
.gallery-grid .gallery-item .gallery-caption p{font-size:.8rem;color:var(--gray-500)}

/* ===== Video Section ===== */
.video-wrap{border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-xl)}
.video-wrap video{width:100%;display:block}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .section{padding:70px 0}
  .hero-content h1{font-size:2.4rem}
  .section-title{font-size:1.9rem}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .products-grid{grid-template-columns:repeat(2,1fr)}
  .stats-bar{grid-template-columns:repeat(2,1fr)}
  .product-highlight{flex-direction:column!important;gap:30px}
  .footer-grid{grid-template-columns:1fr 1fr}
}

@media(max-width:768px){
  .header-inner{height:64px}
  .nav{position:fixed;top:64px;left:0;width:100%;background:rgba(255,255,255,.98);backdrop-filter:blur(12px);flex-direction:column;padding:20px 30px;box-shadow:0 10px 30px rgba(0,0,0,.1);border-radius:0 0 16px 16px;transform:translateY(-120%);transition:transform .35s;z-index:999}
  .nav.open{transform:translateY(0)}
  .menu-btn{display:block}
  .hero{min-height:80vh}
  .hero-content h1{font-size:2rem}
  .hero-content{max-width:100%}
  .section-title{font-size:1.6rem}
  .features-grid,.products-grid,.contact-grid{grid-template-columns:repeat(2,1fr)}
  .gallery-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .stats-bar{grid-template-columns:repeat(2,1fr)}
  .poster-banner{height:300px}
  .poster-banner .overlay{padding:30px}
  .poster-banner .overlay h2{font-size:1.4rem}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .btn{padding:12px 24px;font-size:.88rem}
  .container{padding:0 16px}
}