/* ERSSC — Engineering Root Solution Saudi Company */
@font-face{font-family:"Cormorant";src:url(/assets/fonts/cormorant.woff2) format("woff2");font-weight:500 600;font-style:normal;font-display:swap}
@font-face{font-family:"Cormorant";src:url(/assets/fonts/cormorant-italic.woff2) format("woff2");font-weight:500;font-style:italic;font-display:swap}
@font-face{font-family:"Inter";src:url(/assets/fonts/inter.woff2) format("woff2");font-weight:300 700;font-style:normal;font-display:swap}

:root{
  --night:#060E1C; --navy:#0B1A30; --navy-2:#12264A; --gold:#C9A35B; --gold-2:#E2C88E; --gold-d:#9C7A3A;
  --ivory:#F7F3EC; --paper:#FBF9F5; --ink:#141C2B; --stone:#6B7486; --line:rgba(20,28,43,.12); --line-l:rgba(255,255,255,.14);
  --serif:"Cormorant","Times New Roman",serif; --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --wrap:1240px; --pad:clamp(20px,4vw,48px); --sec:clamp(80px,11vw,160px);
  --ease:cubic-bezier(.2,.7,.1,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:300 17px/1.7 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{display:block;max-width:100%;height:auto}
picture{display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.08;letter-spacing:-.01em;margin:0 0 .5em;color:inherit}
h1{font-size:clamp(46px,7vw,96px)} h2{font-size:clamp(34px,4.4vw,60px)} h3{font-size:clamp(22px,2vw,28px)}
h1 em,h2 em{font-style:italic;color:var(--gold-2)}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.skip{position:absolute;left:-999px;top:12px;z-index:100;background:var(--gold);color:var(--night);padding:10px 16px}
.skip:focus{left:12px}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.kicker{font:600 12px/1.4 var(--sans);letter-spacing:.28em;text-transform:uppercase;color:var(--gold-d);margin:0 0 22px;display:flex;align-items:center;gap:14px}
.kicker::before{content:"";width:36px;height:1px;background:currentColor}
.lead{font-size:clamp(18px,1.5vw,21px);line-height:1.65;color:var(--stone)}
.muted{color:rgba(255,255,255,.55)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 30px;font:500 13px/1 var(--sans);letter-spacing:.16em;text-transform:uppercase;border:1px solid transparent;transition:background .4s var(--ease),color .4s var(--ease),border-color .4s var(--ease),transform .4s var(--ease);cursor:pointer}
.btn-gold{background:var(--gold);color:var(--night)}
.btn-gold:hover{background:var(--gold-2)}
.btn-ghost{border-color:rgba(255,255,255,.4);color:#fff}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-2)}
.btn-line{border-color:rgba(255,255,255,.3);color:#fff;text-transform:none;letter-spacing:.02em;font-size:15px}
.btn-line:hover{border-color:var(--gold);color:var(--gold-2)}
.btn-line-dark{border-color:var(--ink);color:var(--ink)}
.btn-line-dark:hover{background:var(--ink);color:#fff}

/* header */
.site-header{position:fixed;inset:0 0 auto;z-index:50;transition:background .5s var(--ease),box-shadow .5s var(--ease),padding .5s var(--ease);padding:22px 0;color:var(--ink)}
.site-header.on-dark{color:#fff}
.site-header.scrolled{background:rgba(6,14,28,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);padding:12px 0;color:#fff;box-shadow:0 1px 0 var(--line-l)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex}
.logo-svg{height:40px;width:auto;color:currentColor;transition:height .5s var(--ease)}
.scrolled .logo-svg{height:34px}
.nav ul{display:flex;align-items:center;gap:34px}
.nav a{font:400 14px/1 var(--sans);letter-spacing:.06em;position:relative;padding:6px 0}
.nav li:not(.nav-cta) a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.nav li:not(.nav-cta) a:hover::after,.nav a[aria-current=page]::after{transform:scaleX(1)}
.nav .btn{min-height:44px;padding:0 22px;font-size:12px}
.nav-toggle{display:none;background:none;border:0;width:44px;height:44px;position:relative;cursor:pointer;color:inherit}
.nav-toggle span:not(.sr){position:absolute;left:10px;right:10px;height:1px;background:currentColor;transition:transform .4s var(--ease)}
.nav-toggle span:nth-child(1){top:18px} .nav-toggle span:nth-child(2){top:26px}
.nav-toggle[aria-expanded=true] span:nth-child(1){transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded=true] span:nth-child(2){transform:translateY(-4px) rotate(-45deg)}

/* hero */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;justify-content:flex-end;color:#fff;background:var(--night);overflow:hidden}
.hero-img,.page-hero-img{position:absolute;inset:0}
.hero-img img,.page-hero-img img{width:100%;height:100%;object-fit:cover;object-position:65% 50%;transform:scale(1.04);animation:settle 2.4s var(--ease) forwards}
@keyframes settle{to{transform:scale(1)}}
.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,14,28,.94) 0%,rgba(6,14,28,.78) 38%,rgba(6,14,28,.25) 70%,rgba(6,14,28,.35)),linear-gradient(0deg,rgba(6,14,28,.85),transparent 40%)}
.hero-inner{position:relative;padding-top:160px;padding-bottom:64px}
.hero-inner h1{max-width:13ch}
.hero .lede{max-width:600px;font-size:clamp(17px,1.4vw,20px);color:rgba(255,255,255,.78);margin:28px 0 40px}
.hero .kicker{color:var(--gold)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.hero-foot{position:relative;display:flex;flex-wrap:wrap;gap:12px 40px;padding-top:26px;padding-bottom:30px;border-top:1px solid var(--line-l);font:500 11px/1.4 var(--sans);letter-spacing:.24em;text-transform:uppercase;color:rgba(255,255,255,.6)}

.page-hero{position:relative;min-height:72svh;display:flex;align-items:flex-end;color:#fff;background:var(--night);overflow:hidden}
.page-hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,14,28,.92),rgba(6,14,28,.55) 55%,rgba(6,14,28,.25)),linear-gradient(0deg,rgba(6,14,28,.8),transparent 50%)}
.page-hero-inner{position:relative;padding-top:180px;padding-bottom:80px}
.page-hero .kicker{color:var(--gold)}
.page-hero h1{max-width:16ch;font-size:clamp(42px,6vw,84px)}
.page-hero .lede{max-width:640px;color:rgba(255,255,255,.75);font-size:clamp(17px,1.4vw,20px)}
.crumbs ol{display:flex;flex-wrap:wrap;gap:10px;font-size:13px;color:rgba(255,255,255,.55);margin-bottom:30px}
.crumbs li+li::before{content:"/";margin-right:10px;color:var(--gold)}
.crumbs a:hover{color:#fff}

/* intro */
.intro{padding:var(--sec) 0 calc(var(--sec)*.7)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,96px);align-items:start}
.intro-grid h2{max-width:14ch}
.pillars{display:grid;grid-template-columns:repeat(4,1fr);margin-top:clamp(56px,7vw,96px);border-top:1px solid var(--line)}
.pillar{position:relative;padding:40px 32px 48px 0;border-right:1px solid var(--line);transition:background .5s var(--ease)}
.pillar+.pillar{padding-left:32px}
.pillar:last-child{border-right:0}
.pillar-n{font:500 13px var(--sans);letter-spacing:.2em;color:var(--gold-d)}
.pillar h3{margin:22px 0 12px}
.pillar p{color:var(--stone);font-size:15px;margin:0}
.pillar .arrow{position:absolute;right:28px;top:38px;color:var(--gold-d);opacity:0;transform:translateX(-8px);transition:all .5s var(--ease)}
.pillar:hover .arrow{opacity:1;transform:none}

/* services grid */
.services{padding:0 0 var(--sec)}
.section-head{margin-bottom:clamp(40px,5vw,72px)}
.section-head>*{max-width:820px}
.section-head.light{color:#fff}
.section-head.light .kicker{color:var(--gold)}
.svc-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:24px}
.svc-card{grid-column:span 2;background:#fff;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 1px 0 var(--line);transition:transform .6s var(--ease),box-shadow .6s var(--ease)}
.svc-card:nth-child(4),.svc-card:nth-child(5){grid-column:span 3}
.svc-card picture{aspect-ratio:16/10;overflow:hidden}
.svc-card img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.svc-card:hover{transform:translateY(-6px);box-shadow:0 30px 60px -30px rgba(11,26,48,.35)}
.svc-card:hover img{transform:scale(1.05)}
.svc-card-body{padding:30px 32px 34px;display:flex;flex-direction:column;flex:1}
.svc-n{font:500 12px var(--sans);letter-spacing:.24em;color:var(--gold-d);margin-bottom:14px}
.svc-card p{color:var(--stone);font-size:15px;flex:1}
.link{font:500 12px var(--sans);letter-spacing:.18em;text-transform:uppercase;color:var(--ink);border-bottom:1px solid var(--gold);align-self:flex-start;padding-bottom:4px}

/* feature split */
.feature{display:grid;grid-template-columns:1.15fr 1fr;background:var(--ivory);align-items:stretch}
.feature-media{min-height:560px;position:relative}
.feature-media picture,.feature-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.feature-copy{padding:clamp(56px,7vw,120px) clamp(28px,6vw,110px)}
.feature-copy h2{max-width:16ch}
.ticks{margin:28px 0 40px;display:grid;gap:14px}
.ticks li{display:flex;gap:16px;align-items:center;font-weight:400}
.ticks li::before{content:"";width:22px;height:1px;background:var(--gold-d)}

/* approach */
.approach{background:var(--navy);color:#fff;padding:var(--sec) 0;position:relative;overflow:hidden}
.approach::before{content:"";position:absolute;inset:0;background:radial-gradient(60% 80% at 85% 0%,rgba(201,163,91,.14),transparent 60%);pointer-events:none}
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}
.steps li{padding:34px 28px 10px 0;border-top:1px solid var(--line-l);position:relative}
.steps li::before{content:"";position:absolute;top:-4px;left:0;width:7px;height:7px;border-radius:50%;background:var(--gold)}
.step-n{font:500 12px var(--sans);letter-spacing:.24em;color:var(--gold)}
.steps h3{margin:18px 0 10px;font-size:30px}
.steps p{color:rgba(255,255,255,.62);font-size:15px}
.principle{display:flex;gap:32px;align-items:baseline;margin-top:clamp(48px,6vw,80px);padding-top:36px;border-top:1px solid var(--line-l)}
.principle span{font:600 12px var(--sans);letter-spacing:.24em;text-transform:uppercase;color:var(--gold);white-space:nowrap}
.principle p{font-family:var(--serif);font-size:clamp(24px,2.4vw,34px);line-height:1.3;margin:0;max-width:30ch}

/* why */
.why{padding:var(--sec) 0}
.why-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(40px,7vw,120px)}
.why-head{position:sticky;top:120px;align-self:start}
.why-list{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--line)}
.why-item{padding:40px 32px 40px 0;border-bottom:1px solid var(--line)}
.why-item:nth-child(odd){border-right:1px solid var(--line)}
.why-item:nth-child(even){padding-left:32px}
.why-n{font:500 12px var(--sans);letter-spacing:.24em;color:var(--gold-d)}
.why-item h3{margin:16px 0 10px}
.why-item p{color:var(--stone);font-size:15px;margin:0}

/* cta */
.cta{background:var(--night);color:#fff;padding:clamp(72px,9vw,130px) 0;position:relative;overflow:hidden}
.cta::after{content:"";position:absolute;right:-10%;top:-40%;width:60%;height:180%;background:radial-gradient(closest-side,rgba(201,163,91,.09),transparent);pointer-events:none}
.cta-inner{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:end;position:relative;z-index:1}
.cta h2{max-width:18ch}
.cta .kicker{color:var(--gold)}
.cta .lead{color:rgba(255,255,255,.65);max-width:560px;margin:0}
.cta-actions{display:flex;flex-direction:column;gap:14px;align-items:flex-start}

/* detail rows */
.detail{padding:clamp(64px,8vw,120px) 0}
.detail+.detail{padding-top:0}
.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,6vw,100px);align-items:center}
.detail.flip .detail-media{order:2}
.detail-media{position:relative}
.detail-media picture{aspect-ratio:4/5;overflow:hidden}
.detail-media img{width:100%;height:100%;object-fit:cover}
.detail-media::after{content:"";position:absolute;inset:18px -18px -18px 18px;border:1px solid var(--gold);z-index:-1;opacity:.55}
.detail.flip .detail-media::after{inset:18px 18px -18px -18px}
.index{font-family:var(--serif);font-size:72px;line-height:1;color:var(--gold);margin:0 0 12px;font-style:italic}
.points{margin-top:30px;border-top:1px solid var(--line)}
.points li{display:flex;gap:22px;padding:16px 0;border-bottom:1px solid var(--line);font-size:16px;font-weight:400}
.points .num{font:500 12px/2 var(--sans);letter-spacing:.16em;color:var(--gold-d);min-width:24px}

/* about */
.vmv{padding:var(--sec) 0}
.vmv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.vmv-item{background:#fff;padding:48px 40px;box-shadow:0 1px 0 var(--line)}
.vmv-item.dark{background:var(--navy);color:#fff}
.vmv-item.dark .kicker{color:var(--gold)}
.vmv-text{font-family:var(--serif);font-size:clamp(24px,2.2vw,30px);line-height:1.3;margin:0}
.values{display:grid;gap:12px;font-family:var(--serif);font-size:24px}
.values li{border-bottom:1px solid var(--line);padding-bottom:10px}

/* portfolio */
.portfolio{padding:var(--sec) 0 calc(var(--sec)*.6)}
.port-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,4vw,64px)}
.port-col h3{padding-bottom:20px;border-bottom:1px solid var(--gold);margin-bottom:8px}
.port-col li{padding:14px 0;border-bottom:1px solid var(--line);font-weight:400}

/* water extras */
.deliverables{padding:0 0 var(--sec)}
.dlv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.dlv{background:var(--navy);color:#fff;padding:44px 38px}
.dlv h3{color:var(--gold-2)}
.dlv p{color:rgba(255,255,255,.7);font-size:15px;margin:0}
.study{margin-top:clamp(56px,6vw,90px)}
.study-steps{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.study-steps li{padding:28px 28px 0 0}
.study-steps b{display:block;font-family:var(--serif);font-weight:500;font-size:26px;margin-bottom:8px}
.study-steps span{color:var(--stone);font-size:15px}
.apps{background:var(--ivory);padding:clamp(56px,6vw,90px) 0}
.apps ul{display:flex;flex-wrap:wrap;gap:12px}
.apps li{border:1px solid rgba(156,122,58,.4);padding:12px 22px;font-size:15px;font-weight:400}
.next{padding:0 0 clamp(64px,7vw,110px)}
.next-link{display:flex;flex-direction:column;padding:48px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.next-link .kicker{margin-bottom:12px}
.next-title{font-family:var(--serif);font-size:clamp(32px,4vw,56px);transition:color .4s var(--ease)}
.next-link:hover .next-title{color:var(--gold-d)}

/* contact */
.contact{padding:var(--sec) 0}
.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(40px,7vw,120px)}
.contact-info dl{margin:40px 0 0;border-top:1px solid var(--line)}
.contact-info dl div{padding:20px 0;border-bottom:1px solid var(--line)}
.contact-info dt{font:600 11px var(--sans);letter-spacing:.24em;text-transform:uppercase;color:var(--gold-d);margin-bottom:6px}
.contact-info dd{margin:0;font-family:var(--serif);font-size:26px}
.contact-info a:hover{color:var(--gold-d)}
.contact-form{display:grid;grid-template-columns:1fr 1fr;gap:26px 28px;background:#fff;padding:clamp(28px,4vw,56px);box-shadow:0 30px 80px -50px rgba(11,26,48,.4)}
.field{display:flex;flex-direction:column;gap:8px}
.field.full{grid-column:1/-1}
.field label{font:600 11px var(--sans);letter-spacing:.2em;text-transform:uppercase;color:var(--stone)}
.field input,.field select,.field textarea{font:400 16px var(--sans);color:var(--ink);background:transparent;border:0;border-bottom:1px solid rgba(20,28,43,.25);padding:10px 0;border-radius:0;transition:border-color .3s}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--gold)}
.field [aria-invalid=true]{border-color:#B4462B}
.form-note{font-size:13px;color:var(--stone);margin:14px 0 0}

/* 404 */
.notfound{min-height:80svh;display:flex;align-items:center;padding:160px 0 80px;background:var(--ivory)}

/* footer */
.site-footer{background:var(--night);color:#fff;padding:clamp(64px,7vw,100px) 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:40px;padding-bottom:64px}
.site-footer .logo-svg{height:44px}
.footer-name{font-family:var(--serif);font-size:22px;margin:24px 0 8px}
.footer-h{font:600 11px var(--sans);letter-spacing:.24em;text-transform:uppercase;color:var(--gold);margin-bottom:22px}
.footer-list{display:grid;gap:12px;font-size:15px;color:rgba(255,255,255,.78)}
.footer-list a:hover{color:var(--gold-2)}
.footer-base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:24px;padding-bottom:28px;border-top:1px solid var(--line-l);font-size:13px;color:rgba(255,255,255,.5)}

/* reveal */
.reveal{opacity:0;transform:translateY(28px);transition:opacity 1.1s var(--ease),transform 1.1s var(--ease)}
.reveal.in{opacity:1;transform:none}
.site-header.nav-open{color:#fff}

/* responsive */
@media (max-width:1080px){
  .nav-toggle{display:block;z-index:2}
  .nav ul{position:fixed;inset:0;flex-direction:column;justify-content:center;gap:28px;background:var(--night);color:#fff;opacity:0;visibility:hidden;transition:opacity .4s var(--ease),visibility .4s}
  .nav ul.open{opacity:1;visibility:visible}
  .nav a{font-family:var(--serif);font-size:32px;letter-spacing:0}
  .nav .btn{font-family:var(--sans);font-size:13px;min-height:52px}
  .pillars{grid-template-columns:1fr 1fr}
  .pillar:nth-child(2){border-right:0}
  .pillar:nth-child(3){padding-left:0}
  .pillar:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .steps{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  body{font-size:16px}
  .intro-grid,.feature,.why-grid,.cta-inner,.detail-grid,.contact-grid,.vmv-grid,.port-grid,.dlv-grid{grid-template-columns:1fr}
  .detail.flip .detail-media{order:0}
  .detail-media::after{display:none}
  .detail-media picture{aspect-ratio:4/3}
  .svc-grid{grid-template-columns:1fr}
  .svc-card,.svc-card:nth-child(4),.svc-card:nth-child(5){grid-column:auto}
  .feature-media{min-height:340px}
  .why-head{position:static}
  .why-list{grid-template-columns:1fr}
  .why-item:nth-child(odd){border-right:0}
  .why-item:nth-child(even){padding-left:0}
  .principle{flex-direction:column;gap:14px}
  .study-steps{grid-template-columns:1fr 1fr}
  .contact-form{grid-template-columns:1fr}
}
@media (max-width:560px){
  .pillars,.steps,.study-steps,.footer-grid{grid-template-columns:1fr}
  .pillar,.pillar+.pillar{padding:32px 0;border-right:0;border-bottom:1px solid var(--line)}
  .hero-foot{gap:10px 22px;font-size:10px}
  .logo-svg{height:34px}
  .btn{width:100%}
  .hero-actions{flex-direction:column}
  .cta-actions{align-items:stretch}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}
.sitemap .port-col a{transition:color .3s}
.sitemap .port-col a:hover{color:var(--gold-d)}