/* ==========================================================
   VLS Engineers — Home page
   Palette: black + cyan + lime green (per client brief)
   ========================================================== */

:root{
  --black:#05080a;
  --panel:#0a1013;
  --panel-2:#0e161a;
  --line:rgba(255,255,255,.1);
  --line-2:rgba(255,255,255,.18);
  --cyan:#16c3d4;
  --cyan-dim:rgba(22,195,212,.5);
  --green:#8fd032;
  --white:#fff;
  --grey:#9aa7ad;
  --grey-2:#6d7a80;
  --display:"Bodoni Moda",Georgia,"Times New Roman",serif;
  --body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --wrap:1240px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{font-family:var(--body);font-size:17px;line-height:1.7;color:var(--grey);background:var(--black);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
h1,h2,h3{font-family:var(--display);font-weight:400;line-height:1.1;color:var(--white);letter-spacing:-.01em}
h2{font-size:clamp(2rem,4.2vw,3.2rem)}
h3{font-size:1.15rem;font-family:var(--body);font-weight:600;letter-spacing:-.005em}
p{max-width:70ch}
section{padding:96px 0;position:relative}

/* eyebrow label with cyan rule */
.eye{display:flex;align-items:center;gap:14px;font-size:.7rem;font-weight:600;letter-spacing:.26em;text-transform:uppercase;color:var(--cyan);margin-bottom:18px}
.eye::before{content:"";width:28px;height:1px;background:var(--cyan)}
.center .eye{justify-content:center}
.center .eye::after{content:"";width:28px;height:1px;background:var(--cyan)}
.center{text-align:center}
.center p{margin-left:auto;margin-right:auto}
.sub{color:var(--grey);max-width:62ch;font-size:1.03rem}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:15px 30px;font-family:var(--body);font-weight:600;font-size:.95rem;letter-spacing:.02em;border:1px solid transparent;cursor:pointer;transition:.2s}
.btn-cyan{background:var(--cyan);color:#03191c}
.btn-cyan:hover{background:#2ad8e9;box-shadow:0 0 28px rgba(22,195,212,.4)}
.btn-ghost{border-color:var(--line-2);color:var(--white)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-green{background:var(--green);color:#0d2410}
.btn-green:hover{background:#a3e043}

/* ---------------- header ---------------- */
.head{position:sticky;top:0;z-index:80;background:rgba(5,8,10,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.head .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:84px}
.logo{display:flex;align-items:center;gap:13px;flex:none}
.logo .mk{width:48px;height:48px;border:1.5px solid var(--cyan);display:grid;place-items:center;font-family:var(--display);font-size:1.26rem;color:var(--cyan);letter-spacing:.04em;flex:none}
.logo b{display:block;font-family:var(--display);font-size:1.3rem;color:var(--white);font-weight:400;line-height:1.15;letter-spacing:.01em}
.logo span{display:block;font-size:.63rem;letter-spacing:.2em;text-transform:uppercase;color:var(--grey-2)}
nav ul{display:flex;gap:34px}
nav a{font-size:.9rem;font-weight:500;letter-spacing:.04em;text-transform:uppercase;color:var(--grey);padding:6px 0;position:relative;white-space:nowrap;transition:color .2s}
nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--cyan);transition:right .25s}
nav a:hover,nav a[aria-current]{color:var(--white)}
nav a:hover::after,nav a[aria-current]::after{right:0}
.burger{display:none;width:44px;height:44px;border:1px solid var(--line-2);background:none;cursor:pointer;place-items:center}
.burger span{display:block;width:19px;height:1.5px;background:var(--white);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:19px;height:1.5px;background:var(--white)}
.burger span::before{top:-6px}.burger span::after{top:6px}

/* ---------------- hero slider ---------------- */
.hero{position:relative;height:clamp(560px,86vh,760px);overflow:hidden;background:var(--black)}
.slide{position:absolute;inset:0;opacity:0;transition:opacity 1.1s ease;pointer-events:none}
.slide.on{opacity:1;pointer-events:auto}
.slide .bg{position:absolute;inset:0;overflow:hidden}
.slide .bg img{width:100%;height:100%;object-fit:cover;object-position:var(--pos,center);opacity:.58;transform:scale(1.06);transition:transform 11s linear}
.slide.on .bg img{transform:scale(1)}
.slide .bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(5,8,10,.96) 0%,rgba(5,8,10,.8) 45%,rgba(5,8,10,.5) 100%)}
.grid-tex{position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:linear-gradient(rgba(22,195,212,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(22,195,212,.055) 1px,transparent 1px);
  background-size:52px 52px;
  -webkit-mask-image:radial-gradient(130% 100% at 70% 40%,#000 25%,transparent 78%);
  mask-image:radial-gradient(130% 100% at 70% 40%,#000 25%,transparent 78%)}
.slide .inner{position:relative;z-index:3;height:100%;display:flex;align-items:center}
.slide .copy{max-width:44ch}
.slide .inner .wrap{width:100%}
.slide .copy.wide{max-width:60ch}
.slide h1,.slide .h1{font-family:var(--display);font-weight:400;color:var(--white);letter-spacing:-.01em;font-size:clamp(2.1rem,5vw,4.1rem);line-height:1.04;margin-bottom:20px}
.slide h1 em,.slide .h1 em{font-style:normal;color:var(--cyan)}
.slide .desc{color:rgba(255,255,255,.76);font-size:clamp(.98rem,1.4vw,1.1rem);letter-spacing:.02em;max-width:46ch;margin-bottom:30px}
.slide .acts{display:flex;flex-wrap:wrap;gap:13px}
.hero-sheen{position:absolute;left:0;right:0;bottom:0;height:1px;z-index:4;
  background:linear-gradient(90deg,transparent,var(--cyan) 22%,#7fe6f0 50%,var(--cyan) 78%,transparent)}
.dots{position:absolute;left:0;right:0;bottom:36px;z-index:5;display:flex;justify-content:center;gap:12px}
.dots button{width:42px;height:3px;background:rgba(255,255,255,.22);border:0;padding:0;cursor:pointer;position:relative;overflow:hidden}
.dots button span{position:absolute;inset:0;width:0;background:var(--cyan)}
.dots button.on span{width:100%;transition:width 11s linear}

/* ---------------- services ---------------- */
.svc-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;margin-top:52px;background:var(--line)}
.svc{background:var(--panel);padding:30px 24px 32px;transition:.25s;position:relative}
.svc:hover{background:var(--panel-2)}
.svc::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--cyan);transition:width .3s}
.svc:hover::after{width:100%}
.svc .ic{width:42px;height:42px;margin-bottom:18px}
.svc .ic svg{width:100%;height:100%;stroke:var(--cyan);fill:none;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}
.svc:hover .ic svg{stroke:var(--green)}
.svc h3{color:var(--white);margin-bottom:7px;font-size:1.02rem}
.svc p{font-size:.86rem;color:var(--grey-2);line-height:1.55}

/* ---------------- sector ---------------- */
.sector{background:var(--panel)}
.sec-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:52px}
.sec{border:1px solid var(--line);padding:30px 26px;display:flex;gap:18px;align-items:flex-start;transition:.25s;background:rgba(255,255,255,.012)}
.sec:hover{border-color:var(--cyan-dim);background:rgba(22,195,212,.045)}
.sec .ic{width:38px;height:38px;flex:none}
.sec .ic svg{width:100%;height:100%;stroke:var(--cyan);fill:none;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}
.sec h3{color:var(--white);margin-bottom:5px;font-size:1.05rem}
.sec p{font-size:.86rem;color:var(--grey-2);line-height:1.5}

/* ---------------- marquee (clients + flags) ---------------- */
.marq{overflow:hidden;position:relative;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 9%,#000 91%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 9%,#000 91%,transparent)}
.marq-track{display:flex;width:max-content;animation:slide-l 34s linear infinite}
.marq:hover .marq-track{animation-play-state:paused}
@keyframes slide-l{from{transform:translateX(0)}to{transform:translateX(-50%)}}

.cl-item{flex:none;width:224px;margin-right:18px;border:1px solid var(--line);background:#fff;
  padding:0;transition:.25s;overflow:hidden}
.cl-item:hover{border-color:var(--cyan);box-shadow:0 0 26px rgba(22,195,212,.22)}
.cl-item img{width:100%;height:auto;display:block}

.flags{background:var(--panel)}
.fl-item{flex:none;width:150px;margin-right:16px;text-align:center;padding:20px 10px;border:1px solid var(--line);background:rgba(255,255,255,.015);transition:.25s}
.fl-item:hover{border-color:var(--cyan-dim)}
.fl-item img{width:58px;height:39px;margin:0 auto 12px;object-fit:cover;box-shadow:0 3px 12px rgba(0,0,0,.5)}
.fl-item span{font-size:.8rem;letter-spacing:.07em;color:var(--grey);white-space:nowrap}

/* ---------------- contact ---------------- */
.contact{background:var(--black);border-top:1px solid var(--line)}
.ct-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;margin-top:50px;align-items:start}
form{display:grid;gap:18px}
label{display:grid;gap:8px;font-size:.78rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--grey-2)}
input,select,textarea{font:inherit;font-size:.96rem;padding:14px 16px;border:1px solid var(--line-2);background:rgba(255,255,255,.03);color:var(--white);width:100%;border-radius:0;transition:.2s}
input::placeholder,textarea::placeholder{color:var(--grey-2)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--cyan);background:rgba(22,195,212,.05)}
select option{background:var(--panel);color:var(--white)}
textarea{min-height:124px;resize:vertical}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.note{font-size:.82rem;color:var(--grey-2);letter-spacing:.01em}
.ct-info{display:grid;gap:0;border-top:1px solid var(--line)}
.ct-info li{padding:22px 0;border-bottom:1px solid var(--line)}
.ct-info b{display:block;font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);margin-bottom:8px}
.ct-info a,.ct-info span{color:var(--white);font-size:1rem;line-height:1.6}
.ct-info a:hover{color:var(--cyan)}

/* ---------------- bottom contact bar ---------------- */
.botbar{background:var(--panel-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.botbar .wrap{display:flex;justify-content:center;align-items:center;gap:46px;min-height:62px;flex-wrap:wrap}
.botbar a,.botbar span{display:flex;align-items:center;gap:11px;font-size:.92rem;color:var(--grey);letter-spacing:.02em}
.botbar a:hover{color:var(--cyan)}
.botbar svg{width:16px;height:16px;stroke:var(--cyan);fill:none;stroke-width:1.6;flex:none}

.wapp{position:fixed;right:22px;bottom:22px;z-index:90;width:54px;height:54px;border-radius:50%;background:#25d366;display:grid;place-items:center;box-shadow:0 6px 22px rgba(0,0,0,.5)}
.wapp svg{width:29px;height:29px;fill:#fff}

.rise{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.rise.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rise{opacity:1;transform:none;transition:none}
  .marq-track{animation:none}
  .slide .bg img{transition:none;transform:none}
  .dots button.on span{transition:none;width:100%}
}

/* ---------------- responsive ---------------- */
@media (max-width:1180px){
  .svc-grid{grid-template-columns:repeat(4,1fr)}
  nav ul{gap:24px}
  nav a{font-size:.84rem}
}
@media (max-width:980px){
  .svc-grid{grid-template-columns:repeat(3,1fr)}
  .sec-grid{grid-template-columns:repeat(2,1fr)}
  .ct-grid{grid-template-columns:1fr;gap:44px}
  nav{position:fixed;inset:84px 0 0 0;background:rgba(5,8,10,.98);backdrop-filter:blur(18px);display:none;padding:14px 28px 50px;overflow-y:auto}
  nav.open{display:block}
  nav ul{flex-direction:column;gap:0}
  nav li{border-bottom:1px solid var(--line)}
  nav a{display:block;padding:19px 0;font-size:1rem}
  nav a::after{display:none}
  .burger{display:grid}
  .head-cta{display:none}
  section{padding:70px 0}
  .hero{height:clamp(500px,78vh,620px)}
}
@media (max-width:620px){
  body{font-size:16px}
  .svc-grid{grid-template-columns:repeat(2,1fr)}
  .sec-grid{grid-template-columns:1fr}
  .pair{grid-template-columns:1fr}
  .logo b{font-size:1.12rem}
  .logo .mk{width:42px;height:42px;font-size:1.1rem}
  .head .wrap{height:74px}
  nav{inset:74px 0 0 0}
  .botbar .wrap{gap:14px;padding-top:16px;padding-bottom:16px;flex-direction:column}
  .cl-item{width:190px}
  .fl-item{width:124px}
  .dots{bottom:24px}
  .dots button{width:30px}
}
@media (max-width:420px){
  .svc-grid{grid-template-columns:1fr}
}

/* ==========================================================
   Design refinement layer
   ========================================================== */
:root{--ease:cubic-bezier(.2,.7,.2,1);--glow:0 18px 50px -18px rgba(22,195,212,.35)}
::selection{background:var(--cyan);color:#03191c}

/* header: compacts once the page scrolls */
.head{transition:background .3s,box-shadow .3s}
.head .wrap{transition:height .3s var(--ease)}
.head.scrolled{background:rgba(5,8,10,.94);box-shadow:0 10px 30px -14px rgba(0,0,0,.7)}
.head.scrolled .wrap{height:68px}

/* hero: let the photograph breathe on the right, keep copy legible on the left */
.slide .bg::after{background:
  linear-gradient(100deg,rgba(5,8,10,.94) 0%,rgba(5,8,10,.72) 42%,rgba(5,8,10,.18) 100%),
  linear-gradient(0deg,rgba(5,8,10,.85) 0%,transparent 28%)}
.slide .bg img{opacity:.85}
.slide h1,.slide .h1{font-size:clamp(2.4rem,5.6vw,4.7rem);text-shadow:0 2px 30px rgba(0,0,0,.45)}
.slide .copy{max-width:48ch}
.slide .copy::before{content:"";display:block;width:56px;height:3px;background:linear-gradient(90deg,var(--cyan),var(--green));margin-bottom:26px}
.slide .copy > *{opacity:0;transform:translateY(18px)}
.slide.on .copy > *{opacity:1;transform:none;transition:opacity .8s var(--ease),transform .8s var(--ease)}
.slide.on .copy > :nth-child(1){transition-delay:.15s}
.slide.on .copy > :nth-child(2){transition-delay:.3s}
.slide.on .copy > :nth-child(3){transition-delay:.45s}
.slide .copy::before{opacity:1;transform:none}

/* buttons */
.btn{border-radius:2px}
.btn-cyan::after{content:"\2192";transition:transform .25s var(--ease)}
.btn-cyan:hover::after{transform:translateX(4px)}
.btn-cyan:hover{transform:translateY(-1px)}

/* section headings */
section + section{border-top:1px solid var(--line)}
h2{letter-spacing:-.015em}
.center h2{margin-bottom:16px}
.sector,.flags{background:
  radial-gradient(70% 90% at 50% 0%,rgba(22,195,212,.07),transparent 70%),var(--panel)}

/* services: numbered cards with lift */
.svc-grid{counter-reset:svc;gap:1px;border:1px solid var(--line)}
.svc{counter-increment:svc;padding:34px 26px 36px;transition:background .3s,transform .3s var(--ease),box-shadow .3s}
.svc::before{content:counter(svc,decimal-leading-zero);position:absolute;top:22px;right:24px;font-family:var(--display);font-size:1.05rem;color:rgba(255,255,255,.16);transition:color .3s}
.svc:hover{background:var(--panel-2);box-shadow:var(--glow);z-index:2}
.svc:hover::before{color:var(--cyan)}
.svc .ic{width:44px;height:44px;margin-bottom:22px;padding:9px;border:1px solid rgba(22,195,212,.3);border-radius:50%;box-sizing:content-box;width:26px;height:26px}
.svc p{color:var(--grey);font-size:.88rem}

/* sectors */
.sec{transition:border-color .3s,background .3s,transform .3s var(--ease),box-shadow .3s}
.sec:hover{transform:translateY(-3px);box-shadow:var(--glow)}
.sec .ic{width:44px;height:44px;padding:9px;border:1px solid rgba(22,195,212,.3);border-radius:50%;box-sizing:border-box}
.sec p{color:var(--grey)}

/* clients + markets */
.cl-item{border-radius:3px}
.cl-item:hover{transform:translateY(-3px)}
.fl-item{border-radius:3px;transition:.3s var(--ease)}
.fl-item:hover{transform:translateY(-3px);background:rgba(22,195,212,.05)}
.fl-item img{border-radius:2px}

/* contact: form as a panel */
.contact{background:radial-gradient(60% 70% at 85% 10%,rgba(143,208,50,.05),transparent 70%),var(--black)}
#enquiry{background:var(--panel);border:1px solid var(--line);padding:34px;border-radius:3px}
.ct-info li{transition:padding-left .3s var(--ease)}
.ct-info li:hover{padding-left:8px}

/* staggered reveal */
.svc-grid .rise:nth-child(5n+2),.sec-grid .rise:nth-child(3n+2){transition-delay:.08s}
.svc-grid .rise:nth-child(5n+3),.sec-grid .rise:nth-child(3n){transition-delay:.16s}
.svc-grid .rise:nth-child(5n+4){transition-delay:.24s}
.svc-grid .rise:nth-child(5n){transition-delay:.32s}

@media (max-width:620px){
  #enquiry{padding:22px 18px}
  .slide .copy::before{margin-bottom:18px}
}
@media (prefers-reduced-motion:reduce){
  .slide .copy > *{opacity:1;transform:none;transition:none}
}
.slide h1 em{white-space:nowrap}
@media (max-width:420px){.slide h1,.slide .h1{font-size:2.1rem}}

/* ---------------- mobile hero: show the whole photo, text below ---------------- */
.hero{touch-action:pan-y}
@media (max-width:760px){
  .hero{height:auto;padding:0;display:grid;background:var(--black)}
  .slide .acts{margin-top:24px}
  .slide{position:relative;inset:auto;grid-area:1/1;display:flex;flex-direction:column}
  .slide .bg{position:relative;inset:auto;width:100%;aspect-ratio:2000/1116;flex:none}
  .slide .bg img{opacity:1;transform:none;transition:none;object-position:center}
  .slide .bg::after{background:linear-gradient(0deg,var(--black) 0%,transparent 40%)}
  .grid-tex{display:none}
  .slide .inner{height:auto;align-items:flex-start;padding:6px 0 70px}
  .slide .copy,.slide .copy.wide{max-width:none}
  .slide .copy::before{margin-bottom:16px}
  .slide h1,.slide .h1{font-size:clamp(1.9rem,8.4vw,2.6rem)}
  .slide .desc{margin-bottom:0}
  .dots{bottom:26px}
}