/* ===== Design System ===== */
*{margin:0;padding:0;box-sizing:border-box}

/* ===== Local Fonts (no external dependencies) ===== */
@font-face{font-family:'Inter';font-style:normal;font-weight:400 800;font-display:swap;src:url('/public/fonts/inter-v20-latin.woff2') format('woff2')}
@font-face{font-family:'JetBrains Mono';font-style:normal;font-weight:400 700;font-display:swap;src:url('/public/fonts/jetbrains-mono-v24-latin.woff2') format('woff2')}

:root{
  --navy:#0A2540;--blue:#0A6ED8;--accent:#00C2FF;
  --gold:#C8962E;--gold-l:#E0B658;
  --ink:#1A2332;--gray:#5B6776;--line:#E2E6EC;--bg:#F5F8FC;--white:#fff;
  --font-sans:'Inter','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','Consolas',monospace;
}
body{font-family:var(--font-sans);color:var(--ink);background:var(--white);line-height:1.6;font-size:15px}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:72px 0}
.section-title{text-align:center;margin-bottom:6px;font-size:30px;font-weight:700;color:var(--navy)}
.section-title em{color:var(--gold);font-style:normal}
.section-sub{text-align:center;color:var(--gray);font-size:14px;margin-bottom:40px;letter-spacing:1.5px;text-transform:uppercase}
.tag-line{display:none}
html{scroll-behavior:smooth}

/* ===== Header ===== */
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:box-shadow .3s}
header.scrolled{box-shadow:0 2px 20px rgba(10,37,64,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo img{height:38px;transition:transform .3s}
.logo:hover img{transform:scale(1.02)}
.nav-menu{display:flex;gap:6px;list-style:none;padding:0;margin:0}
.nav-menu li{position:relative}
.nav-menu a{display:block;padding:8px 16px;font-size:14px;color:var(--ink);font-weight:600;text-decoration:none;transition:color .25s,background .25s;border-radius:6px;letter-spacing:.3px;position:relative;-webkit-tap-highlight-color:transparent;outline:none}
.nav-menu a:hover{color:#fff;background:var(--navy)}
.nav-menu a:active{color:#fff;background:var(--navy)}
.nav-menu a:focus{outline:none}
.nav-menu a::after{content:"";position:absolute;bottom:4px;left:50%;transform:translateX(-50%);width:0;height:2px;background:var(--gold);transition:width .3s;border-radius:1px}
.nav-menu a:hover::after{width:60%}
.nav-menu a:active::after{width:60%}
.nav-lang{font-size:12px;color:var(--gray);border-left:1px solid var(--line);padding-left:16px;display:flex;align-items:center;gap:4px}
.nav-lang .lang-item{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:6px;font-size:12px;font-weight:700;text-decoration:none;transition:background .25s}
.nav-lang .lang-item.active{background:var(--navy);color:#fff}
.nav-lang a.lang-item{color:var(--gold)}
.nav-lang a.lang-item:hover{background:var(--navy);color:#fff}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;padding:90px 0 100px;color:#fff;background:linear-gradient(135deg,#0A2540 0%,#0E3A66 100%)}
.hero::before{content:"";position:absolute;inset:0;z-index:0;background:radial-gradient(ellipse at 30% 30%,rgba(0,194,255,.1) 0%,transparent 50%),radial-gradient(ellipse at 80% 70%,rgba(200,150,46,.06) 0%,transparent 40%)}
.hero::after{content:"";position:absolute;inset:0;opacity:.04;z-index:0;background-image:linear-gradient(rgba(255,255,255,.1) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.1) 1px,transparent 1px);background-size:60px 60px}
.hero-inner{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:0 24px}
.hero h1{font-size:36px;font-weight:700;line-height:1.2;margin-bottom:12px;letter-spacing:0}
.hero h1 span{color:var(--accent)}
.hero p{font-size:15px;color:#C0D0E8;max-width:620px;margin-bottom:24px;line-height:1.6}
.hero-btns{display:flex;gap:14px;margin-bottom:36px;position:relative;z-index:2}
.hero-stats{display:flex;gap:36px;padding-top:24px;border-top:1px solid rgba(255,255,255,.08);position:relative;z-index:2}
.hero-stat .num{font-size:30px;font-weight:700;color:var(--gold);font-family:var(--font-mono);transition:color .3s}
.hero-stat:hover .num{color:var(--accent)}
.hero-stat .lbl{font-size:12px;color:#98B4D0;margin-top:2px}

/* ===== Buttons ===== */

.btn{display:inline-block;padding:13px 30px;border-radius:4px;font-weight:600;font-size:14px;transition:.25s;cursor:pointer;border:none;position:relative;overflow:hidden}
.btn::after{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:rgba(255,255,255,.15);transform:translate(-50%,-50%);transition:width .6s,height .6s}
.btn:hover::after{width:400px;height:400px}
.btn-primary{background:linear-gradient(135deg,var(--gold),var(--gold-l));color:#fff;box-shadow:0 4px 12px rgba(200,150,46,.2)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(200,150,46,.35)}
.btn-ghost{background:transparent;color:#D0D8E8;border:1.5px solid rgba(255,255,255,.4)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(10,37,64,.3)}

/* ===== Products ===== */
.products{background:var(--bg)}
.prod-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;transition:all .35s cubic-bezier(.25,.46,.45,.94);cursor:pointer}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(10,37,64,.1);border-color:var(--gold)}
.prod-img{height:190px;background-size:cover;background-position:center;background-color:#0A2540;transition:transform .5s cubic-bezier(.25,.46,.45,.94)}
.prod-card:hover .prod-img{transform:scale(1.05)}
.prod-card.featured{border-color:var(--gold-l);position:relative}
.prod-card.featured::before{content:'HOT';position:absolute;top:12px;right:12px;z-index:3;background:linear-gradient(135deg,var(--gold),var(--gold-l));color:#fff;font-size:10px;font-weight:700;padding:3px 10px;border-radius:3px;letter-spacing:1px;animation:pulse 2s infinite}
.prod-info{padding:16px 16px 20px;position:relative}
.prod-info::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--blue),var(--gold));opacity:0;transition:opacity .35s}
.prod-card:hover .prod-info::before{opacity:1}
.prod-info h3{font-size:16px;color:var(--ink);margin-bottom:8px;font-weight:600;transition:color .25s}
.prod-card:hover .prod-info h3{color:var(--gold)}
.prod-info p{font-family:var(--font-mono);font-size:12px;color:var(--gray);line-height:1.7;min-height:62px}
.prod-info .chips{display:flex;gap:4px;flex-wrap:wrap;margin-top:8px}
.chip{font-size:10px;color:var(--gray);background:#EEF2F6;padding:2px 8px;border-radius:3px;transition:.2s;font-family:var(--font-mono)}
.chip:hover{background:var(--gold);color:#fff;transform:scale(1.05)}

/* ===== Applications ===== */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.app-card{text-align:center;padding:24px 12px;border:1px solid var(--line);border-radius:8px;transition:all .35s cubic-bezier(.25,.46,.45,.94);background:#fff}
.app-card:hover{transform:translateY(-6px);box-shadow:0 12px 28px rgba(10,37,64,.08);border-color:var(--gold)}
.app-icon{width:48px;height:48px;margin:0 auto 12px;background:#EEF2F6;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .4s}
.app-icon svg{width:24px;height:24px;fill:var(--gray);transition:.3s}
.app-card:hover .app-icon{background:var(--gold);transform:rotate(360deg) scale(1.1)}
.app-card:hover .app-icon svg{fill:#fff}
.app-card h4{font-size:13px;color:var(--ink);font-weight:500;transition:color .3s}
.app-card:hover h4{color:var(--navy)}

/* ===== About ===== */
.about{background:var(--navy);color:#fff}
.about-wrap{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:end}
.about-wrap h2{font-size:28px;font-weight:600;margin-bottom:16px}
.about-wrap h2 em{color:var(--gold);font-style:normal}
.about-wrap p{color:#B0C8E0;font-size:14px;margin-bottom:14px;line-height:1.7}
.about-badge{display:inline-block;background:rgba(200,150,46,.12);color:var(--gold);font-size:11px;padding:4px 12px;border-radius:2px;margin-bottom:18px;font-weight:500;border:1px solid rgba(200,150,46,.2)}
.about-endorse{background:rgba(255,255,255,.04);border-left:3px solid var(--gold);padding:16px 20px;border-radius:0 6px 6px 0;margin-top:16px}
.about-endorse .en-title{color:#E8DCC8;font-weight:600;font-size:14px;margin-bottom:4px}
.about-endorse p{font-size:12px;color:#8AACD0}
.about-figures{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.about-fig{display:flex;flex-direction:column;align-items:center;justify-content:center;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:6px;padding:24px 20px;text-align:center;min-height:112px;transition:all .4s}
.about-fig:hover{transform:translateY(-4px);background:rgba(255,255,255,.08);border-color:rgba(200,150,46,.3)}
.about-fig .num{font-size:32px;font-weight:700;color:var(--gold);font-family:var(--font-mono);transition:color .3s}
.about-fig:hover .num{color:var(--accent)}
.about-fig .lbl{font-size:12px;color:#8AACD0}

/* ===== Advantages ===== */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.adv-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.adv-card{padding:28px 22px;border:1px solid var(--line);border-radius:8px;text-align:center;transition:all .35s;position:relative;overflow:hidden}
.adv-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(10,37,64,.06);border-color:var(--gold)}
.adv-card::after{content:"";position:absolute;bottom:0;left:15%;width:70%;height:3px;background:linear-gradient(90deg,transparent,var(--gold),transparent);transform:scaleX(0);transition:transform .4s}
.adv-card:hover::after{transform:scaleX(1)}
.adv-num{font-size:12px;font-weight:700;color:var(--gold);letter-spacing:2px;font-family:var(--font-mono)}
.adv-card h4{font-size:16px;color:var(--ink);margin:10px 0 6px;font-weight:600}
.adv-card p{font-size:13px;color:var(--gray);line-height:1.55}

/* ===== Contact ===== */
.contact{background:var(--bg)}
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info h3{font-size:22px;color:var(--ink);margin-bottom:18px;font-weight:600}
.contact-item{display:flex;gap:12px;margin-bottom:16px;align-items:flex-start}
.contact-item .ci-icon{width:36px;height:36px;background:#fff;border:1px solid var(--line);border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .3s}
.contact-item:hover .ci-icon{border-color:var(--gold);background:var(--gold)}
.contact-item:hover .ci-icon svg{fill:#fff}
.contact-item .ci-icon svg{width:18px;height:18px;fill:var(--gray);transition:fill .3s}
.contact-item .ci-text .t{font-size:12px;color:var(--gray)}
.contact-item .ci-text .v{font-size:14px;color:var(--ink);font-weight:600;margin-top:2px}
.contact-item .ci-text .ph{font-size:12px;color:var(--gold);font-style:italic}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:8px;padding:28px;transition:box-shadow .3s}
.contact-form:hover{box-shadow:0 4px 16px rgba(10,37,64,.06)}
.contact-form h3{font-size:18px;color:var(--ink);margin-bottom:16px;font-weight:600}
.form-row{margin-bottom:12px}
.form-row label{display:block;font-size:12px;color:var(--gray);margin-bottom:4px}
.form-row input,.form-row textarea{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:4px;font-size:13px;font-family:var(--font-sans);transition:all .25s}
.form-row input:focus,.form-row textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 2px rgba(200,150,46,.12);transform:translateY(-1px)}
.form-row textarea{height:80px;resize:vertical}

/* ===== Footer ===== */
footer{background:#07182B;color:#8EA4C0;padding:44px 0 20px}
.foot-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;margin-bottom:28px}
.foot-top .brand img{height:36px;margin-bottom:12px}
.foot-top .brand p{font-size:12px;line-height:1.7;color:#7E94B0}
.foot-col h5{color:#E8DCC8;font-size:13px;margin-bottom:12px;font-weight:600}
.foot-col a{display:block;font-size:12px;color:#8EA4C0;margin-bottom:6px;transition:.25s}
.foot-col a:hover{color:var(--gold);transform:translateX(4px)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.06);padding-top:16px;text-align:center;font-size:12px;color:#6A809C}
.foot-bottom .disclaimer{margin-top:4px;color:#5A7090;font-size:11px}

/* ===== Animations ===== */
@keyframes fadeIn { from{opacity:0} to{opacity:1} }
@keyframes fadeInUp { from{opacity:0;transform:translateY(36px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeInDown { from{opacity:0;transform:translateY(-30px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeInLeft { from{opacity:0;transform:translateX(-36px)} to{opacity:1;transform:translateX(0)} }
@keyframes fadeInRight { from{opacity:0;transform:translateX(36px)} to{opacity:1;transform:translateX(0)} }
@keyframes zoomIn { from{opacity:0;transform:scale(0.92)} to{opacity:1;transform:scale(1)} }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.05)} }

/* ===== Scroll Reveal (AOS) ===== */
[data-aos]{
  opacity:0;
  transition-property:opacity,transform;
  transition-duration:0.6s;
  transition-timing-function:cubic-bezier(.25,.46,.45,.94);
  will-change:opacity,transform;
  pointer-events:none;
}
[data-aos].aos-animate{
  opacity:1;
  transform:none;
  pointer-events:auto;
}
[data-aos="fade-up"]{transform:translateY(36px)}
[data-aos="fade-down"]{transform:translateY(-30px)}
[data-aos="fade-left"]{transform:translateX(-36px)}
[data-aos="fade-right"]{transform:translateX(36px)}
[data-aos="fade-in"]{transform:none}
[data-aos="zoom-in"]{transform:scale(0.92)}
[data-aos-delay="100"]{transition-delay:0.1s}
[data-aos-delay="200"]{transition-delay:0.2s}
[data-aos-delay="300"]{transition-delay:0.3s}
[data-aos-delay="400"]{transition-delay:0.4s}
[data-aos-delay="500"]{transition-delay:0.5s}
[data-aos-duration="400"]{transition-duration:0.4s}
[data-aos-duration="800"]{transition-duration:0.8s}
[data-aos-duration="1000"]{transition-duration:1s}
[data-aos-duration="1200"]{transition-duration:1.2s}

/* ===== Filter Chips ===== */
.filter-chip{
  display:inline-block;padding:5px 16px;border-radius:4px;font-size:13px;margin:0 4px 6px 0;
  border:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;
  transition:all .2s;font-family:inherit;
}
.filter-chip:hover{background:var(--bg);border-color:var(--blue)}
.filter-chip.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.filter-chip.disabled{opacity:.35;cursor:not-allowed;color:var(--gray);background:#f5f5f5}
.filter-chip.disabled:hover{background:#f5f5f5;border-color:var(--line)}
.filter-reset:hover{text-decoration:underline}
/* Product items */
.product-item{
  display:grid;grid-template-columns:140px 1fr auto;gap:18px;align-items:center;
  padding:16px;border:1px solid var(--line);border-radius:8px;margin-bottom:12px;background:#fff
}
.product-item-img{
  display:block;width:140px;height:140px;border-radius:6px;
  background:var(--navy) center/cover no-repeat;text-decoration:none
}
.product-item-body h3{font-size:15px;font-weight:600;color:var(--ink);margin-bottom:6px;line-height:1.4}
.product-item-body h3 a{color:inherit;text-decoration:none}
.product-item-body h3 a:hover{color:var(--blue)}
.product-item-meta{font-size:12px;color:var(--gray);margin-bottom:8px}
.product-item-code{font-family:var(--font-mono);color:var(--blue)}
.product-item-sep{margin:0 8px;color:var(--line)}
.product-item-spec{color:var(--gold);font-weight:500}
.product-item-chips{display:flex;flex-wrap:wrap;gap:4px}
.product-item-action{text-align:right}
.product-empty{padding:60px 20px;text-align:center;color:var(--gray);background:#fff;border:1px solid var(--line);border-radius:8px}
/* Product list transition */
#product-list{list-style:none;padding:0;margin:0;transition:opacity .15s ease}
#product-list.loading{opacity:.5;pointer-events:none}

/* ===== Responsive ===== */
@media(max-width:980px){
  header .container.nav{flex-wrap:wrap;height:auto;padding:12px 16px}
  .nav-menu{flex-wrap:wrap;gap:4px;order:3;width:100%;margin-top:8px;justify-content:center}
  .nav-menu a{padding:4px 10px;font-size:12px}
  .nav-lang{order:2}
  .hero h1{font-size:32px}
  .hero{padding:50px 0 60px}
  .hero-stats{gap:16px}
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .app-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid-4{grid-template-columns:repeat(2,1fr)}
  .about-wrap,.contact-wrap{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr 1fr}
  section{padding:50px 0}
}
@media(max-width:768px){
  .prod-img{height:150px}
  .product-item{grid-template-columns:100px 1fr;gap:12px}
  .product-item-img{width:100px;height:100px}
  .product-item-action{grid-column:1/-1;text-align:left;margin-top:-4px}
  .product-item-action .btn{font-size:12px;padding:8px 16px}
  [style*="grid-template-columns:240px 1fr"]{grid-template-columns:1fr!important}
  aside[style*="position:sticky"]{position:static!important;margin-bottom:20px}
  table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  [style*="grid-template-columns:1fr 1fr"][style*="gap"]{grid-template-columns:1fr!important}
  .hero h1{font-size:28px}
  .hero-stat .num{font-size:26px}
  .foot-top{grid-template-columns:1fr 1fr}
  .foot-col{margin-bottom:16px}
  .container{padding:0 16px}
  .nav-menu a{padding:4px 8px;font-size:11px}
}
@media(max-width:480px){
  .prod-grid{grid-template-columns:1fr 1fr;gap:10px}
  .app-grid{grid-template-columns:1fr 1fr;gap:10px}
  .adv-grid-4{grid-template-columns:1fr 1fr;gap:12px}
  .prod-img{height:120px}
  .prod-info{padding:10px 10px 14px}
  .prod-info h3{font-size:13px}
  .prod-info p{font-size:11px;min-height:40px}
  .hero h1{font-size:24px}
  .hero p{font-size:14px}
  .hero-stats{flex-wrap:wrap;gap:12px}
  .hero-stat .num{font-size:22px}
  .hero-stat{flex:1;min-width:80px}
  .section-title{font-size:20px}
  .section-sub{font-size:12px;margin-bottom:24px}
  .btn{font-size:12px;padding:8px 16px}
  section{padding:36px 0}
  .container{padding:0 12px}
  .product-item{grid-template-columns:80px 1fr;gap:10px;padding:10px}
  .product-item-img{width:80px;height:80px}
  .product-item-body h3{font-size:13px}
  .product-item-meta{font-size:11px}
  .filter-chip{font-size:12px;padding:4px 10px}
  .foot-top{grid-template-columns:1fr;text-align:center}
  .foot-top .brand p{font-size:11px}
  .foot-col h5{font-size:12px}
  .foot-col a{font-size:11px}
  [style*="height:80px"]{height:60px!important}
  table{font-size:12px!important}
  td{padding:5px 8px!important}
  .app-card{padding:16px 8px}
  .app-icon{width:36px;height:36px}
  .app-icon svg{width:18px;height:18px}
  .app-card h4{font-size:12px}
  .adv-card{padding:18px 14px}
  .adv-card h4{font-size:14px}
  .adv-card p{font-size:12px}
  .nav-menu a{padding:3px 6px;font-size:10px}
  header .container.nav{padding:8px 12px}
  .logo img{height:30px}
}

/* ===== A11y & Performance Fixes ===== */

/* Skip-to-content */
.skip-link{position:absolute;top:-100px;left:16px;z-index:999;background:var(--navy);color:#fff;padding:12px 20px;border-radius:4px;font-size:14px;font-weight:600;transition:top .2s}
.skip-link:focus{top:16px}

/* Focus visible */
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;border-radius:2px}
.btn:focus-visible,.chip:focus-visible{outline:2px solid var(--gold);outline-offset:2px}

/* Lazy images */
img[loading=lazy]{opacity:0;transition:opacity .3s}
img[loading=lazy].loaded{opacity:1}

/* Reduced motion */
@media(prefers-reduced-motion:reduce){
  *{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important}
  .hero::after{display:none}
}

/* Font loading */
@font-face{font-family:'Inter-fallback';size-advance:14px;src:local("Arial")}
body{font-display:swap}

/* Dark mode */
@media(prefers-color-scheme:dark){
  :root{--bg:#0F1A2C;--white:#162238;--line:#25324A;--ink:#E2E6EC;--gray:#8EA4BE}
  .prod-card,.app-card,.adv-card,.contact-form{background:var(--white);border-color:var(--line)}
  .btn-dark{background:var(--navy)}
  section+.section::before{opacity:.15}
  header{background:rgba(15,26,44,.92);backdrop-filter:blur(16px) saturate(180%)}
  header.scrolled{background:rgba(10,20,36,.96);box-shadow:0 4px 30px rgba(0,0,0,.25)}
  .nav-lang a:hover{background:var(--gold);color:#fff}
}

/* Schema.org JSON-LD SEO markup handled server-side */