:root{
  --ink:#202a33;
  --muted:#66727c;
  --line:#dfe4e8;
  --paper:#ffffff;
  --soft:#f4f6f8;
  --soft-2:#eef2f5;
  --accent:#365f7f;
  --accent-dark:#28485f;
  --shadow:0 16px 50px rgba(32,42,51,.08);
  --radius:22px;
  --container:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Vazirmatn",Tahoma,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--paper);font-size:17px;line-height:1.85;text-rendering:optimizeLegibility}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
button{font:inherit}
.container{width:min(var(--container),calc(100% - 36px));margin-inline:auto}
.section{padding:92px 0}
.section.soft{background:var(--soft)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:var(--accent);margin-bottom:10px}
.eyebrow::before{content:"";width:28px;height:2px;background:currentColor;border-radius:10px}
h1,h2,h3,h4{font-family:inherit;font-weight:700;letter-spacing:0;line-height:1.45;margin-top:0}
h1{font-size:clamp(38px,5.1vw,66px)}
h2{font-size:clamp(30px,3.4vw,46px)}
h3{font-size:clamp(21px,2vw,28px)}
p{margin-top:0;color:#4b5964}
.skip-link{position:fixed;right:16px;top:-70px;z-index:9999;background:#fff;padding:10px 16px;border:1px solid var(--line);border-radius:10px}
.skip-link:focus{top:16px}

/* Header */
.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid rgba(32,42,51,.08)}
.header-inner{min-height:78px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:12px;min-width:max-content}
.brand-mark{width:44px;height:44px;border-radius:12px;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700;direction:ltr}
.brand-copy{display:flex;flex-direction:column;line-height:1.35}
.brand-copy strong{font-size:18px}
.brand-copy small{font-size:12px;color:#7d8992;direction:ltr;text-align:right}
.main-nav{margin-inline-start:auto;display:flex;align-items:center;gap:22px}
.main-nav a{font-size:15px;font-weight:600;color:#3c4953}
.main-nav a:hover{color:var(--accent)}
.header-phone{direction:ltr;border:1px solid var(--line);border-radius:12px;padding:9px 13px;font-weight:700;font-size:14px;background:#fff}
.menu-toggle{display:none;background:none;border:0;width:44px;height:44px;padding:9px;cursor:pointer}
.menu-toggle span{height:2px;background:var(--ink);display:block;margin:6px 0}

/* Hero */
.hero{background:linear-gradient(180deg,#f7f8fa 0%,#fff 100%);padding:86px 0 72px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:66px;align-items:center}
.hero-copy p{font-size:18px;max-width:650px;margin-bottom:0}
.hero-copy strong{color:var(--ink)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{min-height:50px;padding:10px 20px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;border:1px solid transparent;transition:.2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--ink);color:#fff}
.btn-outline{background:#fff;border-color:#cfd7dc;color:var(--ink)}
.hero-meta{display:flex;flex-wrap:wrap;gap:9px;margin-top:27px}
.hero-meta span{font-size:14px;color:#5a6670;border:1px solid #dbe1e5;border-radius:999px;padding:6px 11px;background:#fff}
.hero-stage{background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);padding:18px;overflow:hidden}
.hero-slider{position:relative;min-height:510px}
.hero-slide{position:absolute;inset:0;display:grid;grid-template-rows:minmax(390px,1fr) auto;gap:12px;opacity:0;transform:translateX(-12px);transition:opacity .55s ease,transform .55s ease;pointer-events:none}
.hero-slide.active{opacity:1;transform:translateX(0);pointer-events:auto}
.hero-slide-media{background:#f8f9fa;border-radius:20px;overflow:hidden;display:grid;place-items:center}
.hero-slide-media img{width:100%;height:100%;max-height:430px;object-fit:contain;padding:16px}
.hero-slide-caption{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:58px;padding:4px 4px 0}
.hero-slide-caption strong{font-size:17px}
.hero-slide-caption span{font-size:14px;color:var(--muted)}
.slider-dots{display:flex;gap:7px;justify-content:flex-start;margin-top:14px}
.slider-dot{width:10px;height:10px;border:0;border-radius:50%;background:#cbd3d8;cursor:pointer;padding:0}
.slider-dot.active{background:var(--accent);transform:scale(1.18)}

/* Quick nav */
.quick-nav{padding:26px 0;background:#fff;border-bottom:1px solid var(--line)}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.quick-card{border:1px solid var(--line);border-radius:16px;padding:18px 20px;display:flex;align-items:center;gap:14px;background:#fff;transition:.2s}
.quick-card:hover{box-shadow:0 10px 28px rgba(32,42,51,.07);border-color:#cbd5db}
.quick-index{font-size:14px;color:var(--accent);font-weight:700}
.quick-card strong{display:block;font-size:18px}
.quick-card small{display:block;font-size:13px;color:var(--muted);direction:ltr;text-align:right}

/* shared */
.section-head{display:grid;grid-template-columns:1fr .9fr;gap:56px;align-items:end;margin-bottom:42px}
.section-head p{font-size:17px;margin:0}
.section-number{display:inline-block;font-size:15px;font-weight:700;color:#87929a;margin-left:8px}
.intro-note{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px 24px;margin-bottom:26px;color:#4b5964}
.content-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 30px rgba(32,42,51,.035)}
.pill{display:inline-flex;padding:5px 10px;border-radius:999px;background:#edf3f7;color:var(--accent-dark);font-size:14px;font-weight:700;margin-bottom:10px;direction:ltr}

/* O-ring */
.oring-top{display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:stretch;margin-bottom:28px}
.oring-lead{padding:30px}
.oring-lead p{font-size:17px}
.oring-visual{overflow:hidden;min-height:360px}
.oring-visual img{width:100%;height:100%;object-fit:contain;background:#f8f9fa;padding:18px}
.material-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.material-card{overflow:hidden}
.material-image{height:255px;background:#f8f9fa;border-bottom:1px solid var(--line)}
.material-image img{width:100%;height:100%;object-fit:contain;padding:16px}
.material-body{padding:24px}
.material-title{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.material-title strong{font-size:24px;direction:ltr}
.material-title span{font-size:14px;color:var(--muted)}
.material-body h3{font-size:21px;margin-bottom:10px}
.material-body p{font-size:16px}
.spec-list{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.spec-list span{font-size:14px;padding:5px 9px;border:1px solid #d9e0e4;border-radius:999px;color:#46535e;background:#fafbfc}
.detail-box{border-top:1px solid var(--line);padding-top:14px;margin-top:14px;font-size:15px;color:#4b5964}
.detail-box strong{color:var(--ink)}
.compare-wrap{margin-top:26px;padding:26px}
.compare-head{display:flex;align-items:end;justify-content:space-between;gap:26px;margin-bottom:18px}
.compare-head h3{margin-bottom:0}
.compare-head p{font-size:14px;max-width:480px;margin:0}
.table-scroll{overflow:auto;border:1px solid var(--line);border-radius:14px}
table{border-collapse:collapse;width:100%;min-width:820px;background:#fff}
th,td{padding:14px 15px;text-align:right;border-bottom:1px solid #e5e9ec;font-size:14px;vertical-align:middle}
th{background:#f6f8f9;font-size:14px;color:#43505a;white-space:nowrap}
tr:last-child td{border-bottom:0}
.grade{font-weight:600}
.grade.high{color:#2d6a4f}.grade.mid{color:#665d34}.grade.low{color:#7e4d4d}
.fine-print{font-size:13px;color:#78838b;margin:12px 0 0}

/* Product category blocks */
.product-stack{display:grid;gap:24px}
.product-block{display:grid;grid-template-columns:.92fr 1.08fr;gap:28px;padding:24px;align-items:center}
.product-block:nth-child(even){grid-template-columns:1.08fr .92fr}
.product-block:nth-child(even) .product-copy{order:2}
.product-block:nth-child(even) .product-gallery{order:1}
.product-copy h3{margin-bottom:10px}
.product-copy p{font-size:16px}
.product-copy ul{margin:12px 0 0;padding-right:20px;color:#4b5964;font-size:15px}
.product-copy li{margin:4px 0}
.product-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.product-gallery.three{grid-template-columns:repeat(3,1fr)}
.product-gallery.eight{grid-template-columns:repeat(4,1fr)}
.image-button{border:1px solid var(--line);background:#f8f9fa;border-radius:14px;padding:0;overflow:hidden;cursor:pointer;min-height:220px}
.image-button img{width:100%;height:100%;min-height:220px;aspect-ratio:4/3;object-fit:contain;padding:8px;background:#fff;transition:transform .25s}
.image-button:hover img{transform:scale(1.025)}
.caption{font-size:13px;color:#75818a;margin-top:9px}

/* Material strip */
.material-strip{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;margin-top:24px}
.material-chip{border:1px solid var(--line);border-radius:14px;background:#fff;padding:14px 12px;text-align:center}
.material-chip strong{display:block;font-size:15px;direction:ltr}
.material-chip span{display:block;font-size:13px;color:var(--muted);margin-top:2px}

/* Other products */
.other-grid{display:grid;grid-template-columns:1fr .9fr;gap:28px;align-items:stretch}
.other-main{padding:30px}
.other-list{display:grid;gap:12px;margin-top:20px}
.other-item{border:1px solid var(--line);border-radius:14px;padding:16px 18px;background:#fff;display:flex;align-items:center;justify-content:space-between;gap:16px}
.other-item strong{font-size:18px}
.other-item span{font-size:14px;color:var(--muted)}
.other-cta{padding:30px;background:var(--ink);color:#fff;border-radius:var(--radius)}
.other-cta p{color:#d7dde1;font-size:16px}
.other-cta .btn{background:#fff;color:var(--ink)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.contact-card{padding:30px}
.contact-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0;border-bottom:1px solid var(--line)}
.contact-row:last-child{border-bottom:0}
.contact-row span{font-size:14px;color:var(--muted)}
.contact-row strong{font-size:18px}
.contact-placeholder{background:#f8f9fa;border:1px dashed #cbd4da;border-radius:16px;padding:24px;color:#66727c}

/* Footer */
.footer{padding:34px 0;background:#1f2933;color:#fff}
.footer-grid{display:flex;align-items:flex-start;justify-content:space-between;gap:26px}
.footer p{color:#c9d0d5;font-size:14px;margin:4px 0}
.footer small{font-size:13px;color:#aab4bb}
.footer a{text-decoration:underline;text-underline-offset:3px}

/* Lightbox */
.lightbox{position:fixed;inset:0;z-index:2000;background:rgba(20,26,31,.88);display:none;align-items:center;justify-content:center;padding:30px}
.lightbox.open{display:flex}
.lightbox img{max-width:min(1100px,94vw);max-height:88vh;object-fit:contain;background:#fff;border-radius:16px}
.lightbox-close{position:absolute;top:20px;left:22px;width:44px;height:44px;border-radius:50%;border:1px solid rgba(255,255,255,.3);background:rgba(255,255,255,.1);color:#fff;cursor:pointer;font-size:24px}

/* reveal */
.reveal{opacity:0;transform:translateY(14px);transition:.55s ease}
.reveal.visible{opacity:1;transform:none}

@media(max-width:1050px){
  .main-nav{display:none;position:absolute;top:78px;right:18px;left:18px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
  .main-nav.open{display:flex}.menu-toggle{display:block;margin-inline-start:auto}.header-phone{display:none}
  .hero-grid,.section-head,.oring-top,.other-grid,.contact-grid{grid-template-columns:1fr}
  .hero-grid{gap:32px}.hero-stage{max-width:800px}.hero-slider{min-height:500px}
  .material-grid{grid-template-columns:1fr}.material-image{height:300px}
  .product-block,.product-block:nth-child(even){grid-template-columns:1fr}.product-block:nth-child(even) .product-copy,.product-block:nth-child(even) .product-gallery{order:initial}
  .product-gallery.eight{grid-template-columns:repeat(3,1fr)}
  .material-strip{grid-template-columns:repeat(4,1fr)}
}
@media(max-width:720px){
  body{font-size:16px}.container{width:min(100% - 24px,var(--container))}.section{padding:68px 0}
  .header-inner{min-height:70px}.brand-copy strong{font-size:16px}.brand-copy small{font-size:11px}.brand-mark{width:40px;height:40px}
  .hero{padding:58px 0 50px}.hero-copy p{font-size:16px}.hero-stage{padding:12px;border-radius:20px}.hero-slider{min-height:420px}.hero-slide{grid-template-rows:minmax(300px,1fr) auto}.hero-slide-media img{max-height:330px;padding:8px}.hero-slide-caption{align-items:flex-start;flex-direction:column;gap:2px;min-height:64px}.hero-slide-caption strong{font-size:16px}.hero-slide-caption span{font-size:13px}
  .quick-grid{grid-template-columns:1fr}.quick-nav{padding:18px 0}.quick-card{padding:15px 16px}
  .section-head{gap:12px;margin-bottom:28px}.section-head p{font-size:16px}
  .oring-lead{padding:22px}.oring-visual{min-height:280px}.material-image{height:240px}.material-body{padding:20px}.compare-wrap{padding:18px}
  .compare-head{align-items:flex-start;flex-direction:column;gap:6px}
  .product-block{padding:16px;gap:18px}.product-gallery,.product-gallery.three,.product-gallery.eight{grid-template-columns:1fr 1fr}.image-button,.image-button img{min-height:170px}
  .material-strip{grid-template-columns:repeat(2,1fr)}
  .other-main,.other-cta,.contact-card{padding:22px}.footer-grid{flex-direction:column}.footer{padding:28px 0}
}
@media(max-width:470px){
  .product-gallery,.product-gallery.three,.product-gallery.eight{grid-template-columns:1fr}.image-button,.image-button img{min-height:230px}.hero-actions .btn{width:100%}.material-strip{grid-template-columns:1fr 1fr}
}

/* Category separation */
.category-section{position:relative;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.category-oring{background:#fff}
.category-packing{background:#f5f6f7}
.category-suction{background:#fff}
.category-section .section-head{background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px 30px;box-shadow:0 12px 34px rgba(32,42,51,.045);margin-bottom:34px}
.category-packing .section-head{background:#fbfbfc}
.category-section .section-number{display:inline-grid;place-items:center;min-width:42px;height:34px;padding:0 10px;border:1px solid #cfd7dc;border-radius:10px;background:#f6f8f9;color:var(--ink);margin-left:10px}
.category-section::after{content:"";position:absolute;top:0;right:0;left:0;height:4px;background:var(--ink);opacity:.88}
.category-packing::after{opacity:.62}
.category-suction::after{opacity:.78}

/* Hero identity */
.hero-tagline{display:inline-flex;margin:0 0 14px;padding:7px 12px;border-radius:999px;background:#edf1f4;border:1px solid #dbe1e5;color:#3e4a54;font-size:15px;font-weight:700}

/* Why us */
.why-section{background:#eef1f3;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.why-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:25px 23px;min-height:250px}
.why-no{display:inline-flex;font-size:13px;font-weight:700;color:var(--accent);margin-bottom:26px}
.why-card h3{font-size:21px;margin-bottom:10px}
.why-card p{font-size:15.5px;margin-bottom:0}

/* Consultation CTA */
.consult-cta{background:var(--ink);color:#fff;padding:58px 0}
.consult-inner{display:grid;grid-template-columns:1.25fr .75fr;gap:50px;align-items:center}
.consult-cta .eyebrow{color:#dce5eb}
.consult-cta h2{font-size:clamp(27px,3vw,40px);margin-bottom:10px}
.consult-cta p{color:#d4dbe0;max-width:760px;margin-bottom:0}
.consult-actions{display:grid;gap:10px}
.consult-actions .btn{min-height:62px;justify-content:space-between;gap:18px;padding-inline:18px}
.consult-actions .btn span{font-size:13px;font-weight:600}
.consult-actions .btn strong{font-size:17px}
.btn-light{background:#fff;color:var(--ink)}
.btn-ghost-light{border-color:rgba(255,255,255,.35);color:#fff;background:transparent}

/* Contact details */
.contact-section{background:#fff}
.contact-link{transition:.18s}
.contact-link:hover{padding-inline:10px;background:#f7f8f9;border-radius:10px}
.contact-hint{margin-top:18px;padding:14px 16px;background:#f5f7f8;border:1px solid var(--line);border-radius:14px;color:#5e6972;font-size:14px}
.info-block{padding:4px 0 18px;border-bottom:1px solid var(--line)}
.info-block span{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}
.info-block p{font-size:16px;color:var(--ink);margin:0}
.hours-list{display:grid;gap:0;margin-top:8px}
.hours-list div{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:13px 0;border-bottom:1px solid var(--line)}
.hours-list div:last-child{border-bottom:0}
.hours-list span{font-size:14px;color:var(--muted)}
.hours-list strong{font-size:15px}
.footer-contact{text-align:left}

@media(max-width:1050px){
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .consult-inner{grid-template-columns:1fr}
  .consult-actions{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  .category-section .section-head{padding:22px 20px;border-radius:18px}
  .why-grid{grid-template-columns:1fr}.why-card{min-height:auto;padding:22px}.why-no{margin-bottom:14px}
  .consult-cta{padding:46px 0}.consult-inner{gap:26px}.consult-actions{grid-template-columns:1fr}
  .hours-list div{align-items:flex-start;flex-direction:column;gap:2px}
  .footer-contact{text-align:right}
}

/* v4 — brand logo + balanced contact hierarchy */
.brand{display:flex;align-items:center;min-width:0;flex:0 0 auto}
.brand-logo{display:block;width:285px;max-width:30vw;height:auto;object-fit:contain}
.header-inner{gap:22px}
.main-nav{margin-inline-start:auto}
.consult-actions .btn strong{font-size:15px}
@media(max-width:1180px){
  .brand-logo{width:245px;max-width:34vw}
  .main-nav{gap:16px}
  .main-nav a{font-size:14px}
}
@media(max-width:1050px){
  .brand-logo{width:250px;max-width:65vw}
}
@media(max-width:720px){
  .brand-logo{width:205px;max-width:68vw}
}
@media(max-width:390px){
  .brand-logo{width:178px;max-width:64vw}
}