/* =========================================================
   Aditri Engineering — one page site
   Aesthetic: technical / editorial minimalism
   Paper ground, ink type, single amber accent, hairline rules
   ========================================================= */

:root{
  --paper:#f4f2ec;
  --paper-2:#eceae2;
  --ink:#15171b;
  --ink-60:rgba(21,23,27,.62);
  --ink-40:rgba(21,23,27,.42);
  --rule:rgba(21,23,27,.14);
  --navy:#1b3a6b;
  --amber:#e0a51f;
  --gut:clamp(20px,5vw,72px);
  --sans:"Archivo",sans-serif;
  --serif:"Newsreader",Georgia,serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:17px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
}

/* faint blueprint grid behind everything */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(var(--rule) 1px,transparent 1px),
    linear-gradient(90deg,var(--rule) 1px,transparent 1px);
  background-size:96px 96px;opacity:.28;
}
main,header,footer{position:relative;z-index:1}

a{color:inherit}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--sans);font-weight:600;letter-spacing:-.02em;line-height:1.05;margin:0}
p{margin:0}

.wrap{max-width:1240px;margin:0 auto;padding:0 var(--gut)}

.label{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-40);
}

/* ---------------- header ---------------- */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(244,242,236,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--rule);
}
.bar{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.brand{display:flex;align-items:center;gap:13px;text-decoration:none}
.brand img{width:40px;height:auto;flex:none;mix-blend-mode:multiply}
.brand b{font-family:var(--sans);font-size:15px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;display:block}
.brand small{
  display:block;font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;
  color:var(--ink-40);text-transform:uppercase;margin-top:3px;
}
nav{display:flex;align-items:center;gap:26px}
@media(max-width:1180px){nav{gap:18px}nav a{font-size:12.5px}}
nav a{
  font-family:var(--sans);font-size:13px;text-decoration:none;color:var(--ink-60);
  position:relative;padding:4px 0;transition:color .25s;
}
nav a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--ink);
  transition:width .3s cubic-bezier(.2,.7,.3,1);
}
nav a:hover{color:var(--ink)}
nav a:hover::after{width:100%}
.callbtn{
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;text-decoration:none;
  border:1px solid var(--ink);padding:9px 16px;transition:background .25s,color .25s;
}
.callbtn:hover{background:var(--ink);color:var(--paper)}
.navcall{display:none}

/* hamburger — desktop hides it */
.menu{
  display:none;width:40px;height:40px;padding:0;margin-right:-8px;
  background:none;border:0;cursor:pointer;position:relative;
}
.menu span{
  position:absolute;left:9px;width:22px;height:1.5px;background:var(--ink);
  transition:transform .34s cubic-bezier(.2,.7,.2,1),opacity .2s;
}
.menu span:nth-child(1){top:17px}
.menu span:nth-child(2){top:23px}
header[data-open] .menu span:nth-child(1){transform:translateY(3px) rotate(45deg)}
header[data-open] .menu span:nth-child(2){transform:translateY(-3px) rotate(-45deg)}

/* ---- collapsed navigation ---- */
@media(max-width:960px){
  .menu{display:block}
  nav{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-bottom:1px solid var(--rule);
    padding:0 var(--gut);
    max-height:0;overflow:hidden;visibility:hidden;
    transition:max-height .42s cubic-bezier(.2,.7,.2,1),visibility .42s;
  }
  header[data-open] nav{max-height:70vh;visibility:visible}
  nav a{font-size:17px;color:var(--ink);padding:17px 0;border-bottom:1px solid var(--rule)}
  nav a::after{display:none}
  .navcall{
    display:block;font-family:var(--mono);font-size:14px;letter-spacing:.04em;
    border-bottom:0!important;padding-bottom:24px!important;
  }
}
@media(max-width:520px){
  .callbtn{display:none}          /* the number moves into the panel instead */
  .brand img{width:34px}
  .brand b{font-size:13.5px}
  .brand small{white-space:nowrap}
}
@media(max-width:400px){
  .brand small{display:none}      /* stops the tagline wrapping into two lines */
  .bar{height:66px}
}

/* ---------------- hero ---------------- */
/* vertical only — the padding shorthand would wipe out .wrap's side gutters
   and pull the hero out of alignment with the header */
.hero{padding-top:clamp(56px,10vw,120px);padding-bottom:clamp(34px,5vw,60px)}
.hero-top{
  display:flex;justify-content:space-between;align-items:flex-end;gap:32px;
  flex-wrap:wrap;margin-bottom:clamp(28px,5vw,54px);
}
h1{font-size:clamp(44px,9.2vw,132px);letter-spacing:-.035em;line-height:.92;font-weight:700;text-transform:uppercase}
h1 em{font-style:normal;color:var(--ink-40);font-weight:400}
.hero-lede{font-size:clamp(19px,2.1vw,25px);line-height:1.5;font-weight:300;max-width:38ch}
.hero-grid{
  display:grid;grid-template-columns:1.35fr 1fr;gap:clamp(28px,5vw,72px);
  align-items:start;padding-top:34px;border-top:1px solid var(--rule);
}
.hero-meta{display:grid;gap:18px}
.metarow{display:grid;grid-template-columns:88px 1fr;gap:14px;align-items:baseline;font-size:14.5px}
.metarow .label{padding-top:3px}
.metarow .mono{font-family:var(--mono);font-size:13px}
@media(max-width:820px){.hero-grid{grid-template-columns:1fr}}

/* full-bleed hero photograph */
.plate{position:relative;overflow:hidden;background:var(--ink)}
.plate img{
  width:100%;height:clamp(280px,46vw,560px);object-fit:cover;
  filter:grayscale(1) contrast(1.08) brightness(.95);
  transform:scale(1.02);
  transition:filter 1.1s ease,transform 1.6s cubic-bezier(.2,.7,.2,1);
}
.plate:hover img{filter:none;transform:scale(1)}
.plate figcaption{
  position:absolute;left:var(--gut);bottom:22px;color:rgba(244,242,236,.82);
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
}

/* ---------------- sections ---------------- */
section{padding:clamp(56px,8vw,110px) 0;border-top:1px solid var(--rule)}
.sec-head{display:grid;grid-template-columns:180px 1fr;gap:clamp(20px,4vw,56px);margin-bottom:clamp(32px,5vw,60px)}
.sec-head h2{font-size:clamp(28px,4.4vw,54px);letter-spacing:-.03em;max-width:20ch}
@media(max-width:760px){.sec-head{grid-template-columns:1fr;gap:14px}}

.two{display:grid;grid-template-columns:1.35fr 1fr;gap:clamp(28px,5vw,72px)}
@media(max-width:820px){.two{grid-template-columns:1fr}}
.prose{font-size:clamp(17px,1.5vw,19.5px);line-height:1.68;font-weight:300;max-width:62ch}
.prose + .prose{margin-top:1.1em}

/* Portrait beside the about copy.
   align-self:start stops the grid stretching the figure to the text column's
   height; the 2/3 ratio matches the photo's own 667x1000 so nothing is cropped. */
.portrait{margin:0;align-self:start}
.portrait img{
  width:100%;height:auto;aspect-ratio:2/3;object-fit:cover;object-position:center 30%;
  filter:grayscale(1) contrast(1.06);
  transition:filter 1s ease;
}
.portrait:hover img{filter:none}
.portrait figcaption{margin-top:12px;font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-40)}

/* spec list */
.spec{border-top:1px solid var(--ink);margin-top:clamp(28px,4vw,44px)}
.spec div{
  display:grid;grid-template-columns:1fr auto;gap:16px;padding:13px 0;
  border-bottom:1px solid var(--rule);
}
.spec b{font-family:var(--sans);font-weight:500;font-size:13.5px}
.spec span{font-family:var(--mono);font-size:12px;color:var(--ink-60);text-align:right}

/* ---------------- capability columns ---------------- */
.cols{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(28px,5vw,64px)}
@media(max-width:760px){.cols{grid-template-columns:1fr}}
.colhead{
  font-family:var(--sans);font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  padding-bottom:12px;border-bottom:1px solid var(--ink);margin-bottom:6px;
}
ul.line{list-style:none;margin:0;padding:0}
ul.line li{
  padding:14px 0;border-bottom:1px solid var(--rule);
  font-size:16px;font-weight:300;display:flex;gap:14px;
}
ul.line li::before{content:"—";color:var(--amber);font-family:var(--mono);flex:none}

/* ---------------- products ---------------- */
.prods{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--rule);border-left:1px solid var(--rule);
}
@media(max-width:900px){.prods{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.prods{grid-template-columns:1fr}}
.prod{
  border-right:1px solid var(--rule);border-bottom:1px solid var(--rule);
  padding:clamp(20px,2.6vw,30px);
  display:flex;flex-direction:column;gap:20px;transition:background .35s;
}
.prod:hover{background:var(--paper-2)}
/* uniform white catalogue plate — the renders arrive on white / soft grey grounds,
   so a shared plate keeps the six tiles reading as one set */
.prod .shot{
  height:190px;background:#fff;border:1px solid var(--rule);
  display:flex;align-items:center;justify-content:center;overflow:hidden;padding:10px;
}
.prod .shot img{
  max-height:100%;max-width:100%;width:auto;object-fit:contain;
  filter:grayscale(.35) contrast(1.02);
  transition:transform .6s cubic-bezier(.2,.7,.3,1),filter .5s ease;
}
.prod:hover .shot img{transform:scale(1.05);filter:none}
.prod .num{font-family:var(--mono);font-size:11px;color:var(--ink-40)}
.prod h3{font-size:17px;letter-spacing:-.01em;font-weight:600;margin-top:6px}
.prod p{font-size:13.5px;color:var(--ink-60);font-weight:300;line-height:1.5;margin-top:6px}

/* ---------------- process ---------------- */
.steps{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--ink)}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}
.step{padding:26px 22px 30px 0;border-bottom:1px solid var(--rule)}
.step .n{
  font-family:var(--sans);font-size:clamp(34px,4vw,48px);font-weight:700;letter-spacing:-.04em;
  color:var(--amber);line-height:1;display:block;margin-bottom:16px;
}
.step h3{font-size:14.5px;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--ink-60);font-weight:300;line-height:1.5}

.chain{display:flex;flex-wrap:wrap;gap:8px;margin-top:clamp(34px,5vw,54px)}
.chain span{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;
  border:1px solid var(--rule);padding:7px 12px;color:var(--ink-60);background:rgba(255,255,255,.35);
}
.chain span b{color:var(--amber);font-weight:500;margin-right:7px}

/* ---------------- dark quality band ---------------- */
.band{background:var(--ink);color:var(--paper);border-top:0}
.band .two{align-items:end}
.band blockquote{
  margin:0;font-family:var(--sans);font-weight:500;
  font-size:clamp(24px,3.6vw,44px);line-height:1.18;letter-spacing:-.025em;max-width:20ch;
}
.band .accent{color:var(--amber)}
.band p{color:rgba(244,242,236,.68);font-weight:300}

/* ---------------- contact ---------------- */
.contact-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:clamp(24px,4vw,56px)}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr;gap:34px}}
.big-link{
  font-family:var(--sans);font-size:clamp(20px,2.6vw,30px);font-weight:600;letter-spacing:-.025em;
  text-decoration:none;display:inline-block;position:relative;
}
.big-link::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1.5px;width:100%;background:var(--amber);
  transform:scaleX(0);transform-origin:left;transition:transform .4s cubic-bezier(.2,.7,.3,1);
}
.big-link:hover::after{transform:scaleX(1)}
.big-link.sm{font-size:16px}
address{font-style:normal;font-weight:300;font-size:16px;line-height:1.65}
.note{margin-top:20px;font-weight:300;font-size:15.5px;color:var(--ink-60)}
.gst{margin-top:22px;font-family:var(--mono);font-size:12px;color:var(--ink-40)}
.mb{margin-bottom:14px}

footer{border-top:1px solid var(--rule);padding:0 0 40px}
.foot{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;align-items:center;
  border-top:1px solid var(--rule);padding-top:24px}
.foot p{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-40)}
.credit span{color:var(--ink)}

/* ---------------- skip link ---------------- */
.skip{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--ink);color:var(--paper);padding:12px 18px;
  font-family:var(--sans);font-size:13px;text-decoration:none;
}
.skip:focus{left:0}

/* keyword subtitle under the display headline.
   Scoped to h1 so it outranks .drift's inline-block and drops onto its own line. */
h1 .h1-sub{
  display:block;margin-top:clamp(16px,2vw,26px);
  font-family:var(--sans);font-size:clamp(13px,1.35vw,17px);font-weight:500;
  line-height:1.45;letter-spacing:.02em;text-transform:none;
  color:var(--ink-60);max-width:34ch;
}

/* ---------------- industries grid ---------------- */
.grid3{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--rule);border-left:1px solid var(--rule);
}
@media(max-width:900px){.grid3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid3{grid-template-columns:1fr}}
.cell{
  border-right:1px solid var(--rule);border-bottom:1px solid var(--rule);
  padding:clamp(22px,2.8vw,34px);transition:background .35s;
}
.cell:hover{background:var(--paper-2)}
.cell h3{font-size:17px;font-weight:600;margin-bottom:10px}
.cell p{font-size:14.5px;font-weight:300;color:var(--ink-60);line-height:1.55}

/* ---------------- service areas ---------------- */
ul.line.areas li{font-size:15.5px}

/* ---------------- process subhead ---------------- */
.subhead{
  font-family:var(--sans);font-size:13px;font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;color:var(--ink-40);
  margin-top:clamp(34px,5vw,54px);
}
.subhead + .chain{margin-top:18px}

/* ---------------- faq ---------------- */
.faq{border-top:1px solid var(--ink)}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{
  list-style:none;cursor:pointer;padding:20px 44px 20px 0;position:relative;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary h3{
  display:inline;font-size:clamp(16px,1.7vw,19px);font-weight:500;letter-spacing:-.01em;
}
.faq summary::after{
  content:"";position:absolute;right:8px;top:50%;width:13px;height:1.5px;
  background:var(--ink);transition:transform .3s cubic-bezier(.2,.7,.3,1);
}
.faq summary::before{
  content:"";position:absolute;right:8px;top:50%;width:13px;height:1.5px;
  background:var(--ink);transform:rotate(90deg);transition:transform .3s cubic-bezier(.2,.7,.3,1);
}
.faq details[open] summary::before{transform:rotate(0deg)}
.faq summary:hover h3{color:var(--navy)}
.faq details p{
  padding:0 clamp(20px,6vw,90px) 24px 0;
  font-size:16px;font-weight:300;line-height:1.65;color:var(--ink-60);max-width:70ch;
}

/* ---------------- footer ---------------- */
.foot-top{
  display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(24px,4vw,60px);
  padding:clamp(30px,4vw,48px) 0 clamp(26px,3vw,36px);
}
@media(max-width:760px){.foot-top{grid-template-columns:1fr;gap:28px}}
.foot-h{font-family:var(--sans);font-size:15px;font-weight:600;letter-spacing:.04em;margin-bottom:10px}
.foot-p{font-size:15px;font-weight:300;color:var(--ink-60);line-height:1.6;max-width:46ch}
.foot-nav{display:flex;flex-wrap:wrap;gap:10px 26px;align-content:start}
.foot-nav a{
  font-family:var(--sans);font-size:13.5px;color:var(--ink-60);text-decoration:none;
  transition:color .25s;
}
.foot-nav a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

/* ---------------- motion ---------------- */
.drift{display:inline-block;animation:up .9s cubic-bezier(.2,.7,.2,1) both}
.d1{animation-delay:.05s}.d2{animation-delay:.16s}.d3{animation-delay:.27s}.d4{animation-delay:.38s}
@keyframes up{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

/* hidden only when JS is running — no script, no blank sections */
.js .rv{
  opacity:0;transform:translateY(22px);
  transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1);
}
.js .rv.in{opacity:1;transform:none}

@media(prefers-reduced-motion:reduce){
  .rv,.drift{opacity:1!important;transform:none!important;animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}