/* ═══════════════════════════════════════════
   KEYSTONE — high-end construction template
   Concrete, copper and drawing-office rules.
   Technical register: hairlines, spec labels,
   monospaced figures, generous white space.
   ═══════════════════════════════════════════ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}

:root{
  --lime:#F7F6F3;      /* limewash — page ground */
  --plaster:#EFEDE7;
  --concrete:#DFDCD3;
  --rule:#C9C5B9;
  --steel:#6E6B61;
  --graphite:#33322D;
  --char:#1A1A17;
  --copper:#A85A2C;
  --copper-lt:#C67540;
  --disp:'Bricolage Grotesque',system-ui,sans-serif;
  --body:'Chivo',system-ui,sans-serif;
  --mono:'Chivo Mono',ui-monospace,monospace;
}

html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}}

body{
  background:var(--lime);color:var(--graphite);
  font-family:var(--body);font-weight:400;font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{display:block;width:100%;height:100%;object-fit:cover;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;}

.wrap{max-width:1300px;margin:0 auto;padding:0 36px;}

/* ── reveal (JS-gated: never traps content hidden) ── */
.js .rv{opacity:0;transform:translateY(20px);transition:opacity .8s cubic-bezier(.16,1,.3,1),transform .8s cubic-bezier(.16,1,.3,1);}
.js .rv.in{opacity:1;transform:none;}
.js .rv.d1{transition-delay:.08s;} .js .rv.d2{transition-delay:.16s;} .js .rv.d3{transition-delay:.24s;}
@media (prefers-reduced-motion:reduce){
  .js .rv{opacity:1!important;transform:none!important;transition:none!important;}
}

/* image wipe — a drawn reveal rather than a fade */
.js .wipe{clip-path:inset(0 0 100% 0);transition:clip-path 1.15s cubic-bezier(.16,1,.3,1);}
.js .wipe.in{clip-path:inset(0 0 0 0);}
@media (prefers-reduced-motion:reduce){.js .wipe{clip-path:none!important;transition:none!important;}}

/* ── type ── */
.label{
  font-family:var(--mono);font-size:10.5px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--steel);
}
h1,h2,h3,h4{font-family:var(--disp);font-weight:600;letter-spacing:-.028em;line-height:1.02;color:var(--char);}

.btn{
  display:inline-flex;align-items:center;gap:11px;
  font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;
  padding:16px 28px;border:1px solid var(--char);color:var(--char);
  position:relative;overflow:hidden;transition:color .35s;
}
.btn span{position:relative;z-index:2;}
.btn::before{
  content:'';position:absolute;inset:0;background:var(--char);
  transform:scaleX(0);transform-origin:right;
  transition:transform .42s cubic-bezier(.16,1,.3,1);z-index:1;
}
.btn:hover::before{transform:scaleX(1);transform-origin:left;}
.btn:hover{color:var(--lime);}
.btn-solid{background:var(--char);color:var(--lime);border-color:var(--char);}
.btn-solid::before{background:var(--copper);}
.btn-solid:hover{color:#fff;}
.btn-light{border-color:rgba(247,246,243,.4);color:var(--lime);}
.btn-light::before{background:var(--lime);}
.btn-light:hover{color:var(--char);}

/* ══ NAV ══ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:200;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:30px;
  padding:22px 36px;transition:background .4s,padding .4s,border-color .4s;
  border-bottom:1px solid transparent;
}
.nav.stuck{background:rgba(247,246,243,.94);backdrop-filter:blur(12px);border-bottom-color:var(--rule);padding:14px 36px;}
.nav-logo{
  font-family:var(--disp);font-weight:600;font-size:21px;letter-spacing:-.04em;
  color:var(--char);line-height:1;display:flex;align-items:center;gap:9px;
}
.nav-logo i{display:block;width:13px;height:13px;background:var(--copper);
  clip-path:polygon(50% 0,100% 100%,0 100%);font-style:normal;}
.nav-links{display:flex;justify-content:center;gap:32px;}
.nav-links a{
  font-family:var(--mono);font-size:10.5px;font-weight:500;letter-spacing:.16em;
  text-transform:uppercase;color:var(--steel);padding-bottom:3px;position:relative;transition:color .3s;
}
.nav-links a::after{
  content:'';position:absolute;left:0;bottom:0;width:100%;height:1px;background:var(--copper);
  transform:scaleX(0);transform-origin:right;transition:transform .36s cubic-bezier(.16,1,.3,1);
}
.nav-links a:hover{color:var(--char);}
.nav-links a:hover::after{transform:scaleX(1);transform-origin:left;}
.burger{display:none;flex-direction:column;gap:5px;padding:6px;justify-self:end;}
.burger span{display:block;width:22px;height:1.5px;background:var(--char);}

/* Over the hero the header sits on photography, so the steel-grey links
   disappeared against a bright sky. Unstuck = light type over a soft
   scrim (which holds contrast whatever the image is doing); once the
   header gains its own background on scroll, type returns to dark. */
.nav::before{
  content:'';position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(180deg,rgba(20,20,17,.58) 0%,rgba(20,20,17,.22) 55%,rgba(20,20,17,0) 100%);
  transition:opacity .4s;
}
.nav.stuck::before{opacity:0;}
.nav:not(.stuck) .nav-logo{color:var(--lime);}
.nav:not(.stuck) .nav-links a{color:rgba(247,246,243,.9);}
.nav:not(.stuck) .nav-links a:hover{color:#fff;}
.nav:not(.stuck) .nav-links a::after{background:var(--lime);}
.nav:not(.stuck) .burger span{background:var(--lime);}

/* ══ HERO ══ */
.hero{position:relative;min-height:100vh;display:flex;align-items:flex-end;padding:150px 0 46px;overflow:hidden;}
.hero-bg{position:absolute;inset:0;z-index:0;}
.hero-bg img{transform:scale(1.05);filter:contrast(1.04) saturate(.92);}
.hero-bg::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(26,26,23,.5) 0%,rgba(26,26,23,.18) 40%,rgba(26,26,23,.88) 100%);
}
@keyframes ksDrift{0%,100%{transform:scale(1.05);}50%{transform:scale(1.11);}}
.hero-bg img{animation:ksDrift 30s ease-in-out infinite;}
@media (prefers-reduced-motion:reduce){.hero-bg img{animation:none;}}

.hero-inner{position:relative;z-index:2;width:100%;color:var(--lime);}
.hero .label{color:rgba(247,246,243,.72);display:block;margin-bottom:22px;}
.hero h1{
  font-size:clamp(44px,7.4vw,112px);line-height:.98;color:var(--lime);
  max-width:17ch;margin-bottom:30px;
}
.hero h1 em{font-style:normal;color:var(--copper-lt);}
.ln{display:block;overflow:hidden;}
.ln i{display:block;font-style:normal;transform:translateY(104%);}
.js .hero h1 .ln i{animation:ksRise 1s cubic-bezier(.16,1,.3,1) forwards;}
.js .hero h1 .ln:nth-child(1) i{animation-delay:.12s;}
.js .hero h1 .ln:nth-child(2) i{animation-delay:.24s;}
.js .hero h1 .ln:nth-child(3) i{animation-delay:.36s;}
@keyframes ksRise{to{transform:translateY(0);}}
@media (prefers-reduced-motion:reduce){.ln i{transform:none!important;animation:none!important;}}

.hero-foot{display:flex;flex-wrap:wrap;gap:30px;align-items:flex-end;justify-content:space-between;}
.hero-foot p{max-width:46ch;font-size:15px;font-weight:300;line-height:1.85;color:rgba(247,246,243,.84);}
.hero-actions{display:flex;gap:11px;flex-wrap:wrap;}

/* ══ SPEC BAND ══ */
.spec{border-bottom:1px solid var(--rule);background:var(--plaster);}
.spec-in{display:grid;grid-template-columns:repeat(4,1fr);}
.spec-in > div{padding:30px 26px;border-right:1px solid var(--rule);}
.spec-in > div:last-child{border-right:none;}
.spec .n{font-family:var(--disp);font-weight:600;font-size:clamp(32px,4.2vw,54px);letter-spacing:-.04em;line-height:1;color:var(--char);}
.spec .n em{font-style:normal;color:var(--copper);}
.spec .l{margin-top:8px;}

/* ══ SECTIONS ══ */
.sec{padding:clamp(80px,9.5vw,140px) 0;position:relative;}
.sec-plaster{background:var(--plaster);}
.sec-dark{background:var(--char);color:var(--concrete);}
.sec-dark h2,.sec-dark h3{color:var(--lime);}
.sec-dark .label{color:rgba(223,220,211,.6);}

/* section head with a drawn rule */
.head{margin-bottom:clamp(40px,4.8vw,68px);}
.head .label{display:block;margin-bottom:16px;}
.head h2{font-size:clamp(34px,5.2vw,72px);max-width:19ch;margin-bottom:18px;}
.head h2 em{font-style:normal;color:var(--copper);}
.head p{font-size:15px;font-weight:300;line-height:1.9;color:var(--steel);max-width:56ch;}
.drawn{height:1px;background:var(--rule);transform:scaleX(0);transform-origin:left;
  transition:transform 1.1s cubic-bezier(.16,1,.3,1);margin-bottom:34px;}
.js .drawn.in{transform:scaleX(1);}
@media (prefers-reduced-motion:reduce){.drawn{transform:none!important;}}

/* ══ SERVICES ══ */
.svcs{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule);}
.svc{background:var(--lime);padding:clamp(26px,3vw,40px);transition:background .4s;position:relative;}
.svc:hover{background:var(--plaster);}
.svc-n{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--copper);margin-bottom:22px;display:block;}
.svc h3{font-size:24px;margin-bottom:11px;}
.svc p{font-size:14px;font-weight:300;line-height:1.85;color:var(--steel);}

/* ══ PHASE SCRUBBER — the signature piece ══ */
.phases{display:grid;grid-template-columns:1fr 1.15fr;gap:clamp(28px,4vw,64px);align-items:start;}
.ph-list{border-top:1px solid rgba(223,220,211,.22);}
.ph-btn{
  display:grid;grid-template-columns:44px 1fr;gap:18px;align-items:baseline;
  width:100%;text-align:left;padding:20px 4px;
  border-bottom:1px solid rgba(223,220,211,.22);position:relative;
  transition:padding-left .4s cubic-bezier(.16,1,.3,1);
}
.ph-btn::before{
  content:'';position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--copper);
  transform:scaleY(0);transform-origin:bottom;transition:transform .4s cubic-bezier(.16,1,.3,1);
}
.ph-btn:hover{padding-left:14px;}
.ph-btn.on{padding-left:14px;}
.ph-btn.on::before{transform:scaleY(1);transform-origin:top;}
.ph-num{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:rgba(223,220,211,.5);transition:color .3s;}
.ph-btn.on .ph-num{color:var(--copper-lt);}
.ph-name{font-family:var(--disp);font-weight:600;font-size:clamp(20px,2.4vw,30px);letter-spacing:-.03em;color:rgba(247,246,243,.55);transition:color .35s;}
.ph-btn:hover .ph-name,.ph-btn.on .ph-name{color:var(--lime);}

.ph-stage{position:relative;}
.ph-figure{position:relative;aspect-ratio:13/10;overflow:hidden;background:#000;}
.ph-figure img{
  position:absolute;inset:0;opacity:0;transform:scale(1.05);
  transition:opacity .7s cubic-bezier(.16,1,.3,1),transform 1.2s cubic-bezier(.16,1,.3,1);
}
.ph-figure img.on{opacity:1;transform:scale(1);}
.ph-meta{margin-top:22px;min-height:132px;}
.ph-panel{display:none;}
.ph-panel.on{display:block;animation:ksFade .55s cubic-bezier(.16,1,.3,1) both;}
@keyframes ksFade{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:none;}}
@media (prefers-reduced-motion:reduce){.ph-panel.on{animation:none;}.ph-figure img{transition:opacity .01s;}}
.ph-panel h3{font-size:26px;margin-bottom:9px;}
.ph-panel p{font-size:14.5px;font-weight:300;line-height:1.85;color:rgba(223,220,211,.72);max-width:52ch;}
.ph-facts{display:flex;flex-wrap:wrap;gap:26px;margin-top:18px;}
.ph-facts div .k{font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:rgba(223,220,211,.5);}
.ph-facts div .v{font-family:var(--disp);font-weight:600;font-size:19px;color:var(--lime);margin-top:3px;}
.ph-track{display:flex;gap:5px;margin-top:26px;}
.ph-track i{flex:1;height:2px;background:rgba(223,220,211,.2);position:relative;overflow:hidden;}
.ph-track i.on::after{content:'';position:absolute;inset:0;background:var(--copper);
  transform:scaleX(0);transform-origin:left;animation:ksTrack .5s cubic-bezier(.16,1,.3,1) forwards;}
@keyframes ksTrack{to{transform:scaleX(1);}}

/* ══ PROJECT INDEX ══ */
.projects{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(18px,2.4vw,34px);}
.proj{position:relative;}
.proj-img{aspect-ratio:4/5;overflow:hidden;background:var(--concrete);}
.proj-img img{transition:transform 1.1s cubic-bezier(.16,1,.3,1);}
.proj:hover .proj-img img{transform:scale(1.05);}
.proj-body{display:flex;justify-content:space-between;gap:20px;align-items:baseline;
  padding:16px 2px 0;border-top:1px solid var(--rule);margin-top:16px;}
.proj-body h3{font-size:clamp(20px,2.1vw,27px);}
.proj-loc{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);white-space:nowrap;}
.proj-spec{display:flex;gap:20px;margin-top:10px;flex-wrap:wrap;}
.proj-spec span{font-family:var(--mono);font-size:11px;color:var(--steel);letter-spacing:.06em;}
.proj.wide{grid-column:span 2;}
.proj.wide .proj-img{aspect-ratio:16/8;}

/* ══ SPLIT ══ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,4.4vw,74px);align-items:center;}
.split-img{aspect-ratio:13/10;overflow:hidden;}
.split h2{font-size:clamp(32px,4.6vw,62px);margin-bottom:20px;}
.split h2 em{font-style:normal;color:var(--copper);}
.split p{font-size:15px;font-weight:300;line-height:1.9;color:var(--steel);margin-bottom:14px;}
.sec-dark .split p{color:rgba(223,220,211,.72);}
.split-list{margin-top:26px;border-top:1px solid var(--rule);}
.sec-dark .split-list{border-color:rgba(223,220,211,.22);}
.split-list div{display:flex;justify-content:space-between;gap:20px;padding:13px 0;border-bottom:1px solid var(--rule);}
.sec-dark .split-list div{border-color:rgba(223,220,211,.22);}
.split-list .k{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel);}
.sec-dark .split-list .k{color:rgba(223,220,211,.5);}
.split-list .v{font-size:14px;font-weight:400;color:var(--char);text-align:right;}
.sec-dark .split-list .v{color:var(--lime);}

/* ══ QUOTE ══ */
.quote{max-width:900px;margin:0 auto;text-align:center;}
.quote blockquote{font-family:var(--disp);font-weight:500;font-size:clamp(23px,3.3vw,42px);
  line-height:1.24;letter-spacing:-.028em;color:var(--char);margin-bottom:26px;}
.quote cite{font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--steel);font-style:normal;}

/* ══ FAQ ══ */
.faq{border-top:1px solid var(--rule);}
.faq details{border-bottom:1px solid var(--rule);}
.faq summary{
  list-style:none;cursor:pointer;padding:23px 0;display:flex;
  justify-content:space-between;align-items:center;gap:20px;
  font-family:var(--disp);font-weight:600;font-size:clamp(17px,1.8vw,21px);
  letter-spacing:-.02em;color:var(--char);transition:color .3s;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary:hover{color:var(--copper);}
.faq summary::after{content:'';width:11px;height:11px;flex:none;
  border-right:1.5px solid var(--copper);border-bottom:1.5px solid var(--copper);
  transform:rotate(45deg);transition:transform .35s;margin-bottom:4px;}
.faq details[open] summary::after{transform:rotate(-135deg);margin-bottom:0;}
.faq p{padding:0 0 24px;font-size:14.5px;font-weight:300;line-height:1.9;color:var(--steel);max-width:72ch;}

/* ══ ENQUIRY ══ */
.enq{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(32px,4.4vw,76px);}
.enq-side h2{font-size:clamp(32px,4.4vw,60px);margin-bottom:18px;}
.enq-side h2 em{font-style:normal;color:var(--copper);}
.enq-side p{font-size:14.5px;font-weight:300;line-height:1.9;color:var(--steel);margin-bottom:24px;}
.enq-lines{border-top:1px solid var(--rule);}
.enq-lines div{padding:14px 0;border-bottom:1px solid var(--rule);}
.enq-lines .k{font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--steel);margin-bottom:4px;}
.enq-lines .v{font-size:14.5px;color:var(--char);}

.form{border:1px solid var(--rule);background:var(--lime);padding:clamp(24px,3vw,40px);}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:15px;}
.field{margin-bottom:15px;}
.field label{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);margin-bottom:7px;}
.field input,.field select,.field textarea{
  width:100%;background:transparent;border:none;border-bottom:1px solid var(--rule);
  color:var(--char);font-family:var(--body);font-size:15px;padding:10px 2px;transition:border-color .3s;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-bottom-color:var(--copper);}
.field textarea{min-height:96px;resize:vertical;}
.form button{width:100%;justify-content:center;margin-top:12px;}
.form-note{font-family:var(--mono);font-size:10.5px;line-height:1.8;color:var(--steel);margin-top:14px;letter-spacing:.04em;}

/* ══ FOOTER ══ */
.foot{background:var(--char);color:var(--concrete);padding:66px 0 30px;}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;margin-bottom:54px;}
.foot-logo{font-family:var(--disp);font-weight:600;font-size:26px;letter-spacing:-.04em;color:var(--lime);
  display:flex;align-items:center;gap:9px;margin-bottom:14px;}
.foot-logo i{display:block;width:14px;height:14px;background:var(--copper);
  clip-path:polygon(50% 0,100% 100%,0 100%);font-style:normal;}
.foot p{font-size:13.5px;font-weight:300;line-height:1.85;color:rgba(223,220,211,.66);}
.foot h5{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--lime);margin-bottom:14px;}
.foot a{display:block;font-size:13.5px;font-weight:300;color:rgba(223,220,211,.66);margin-bottom:8px;transition:color .3s;}
.foot a:hover{color:var(--copper-lt);}
.foot-mark{
  font-family:var(--disp);font-weight:600;font-size:clamp(46px,13.5vw,190px);
  letter-spacing:-.05em;line-height:.9;color:rgba(223,220,211,.09);
  border-top:1px solid rgba(223,220,211,.16);padding-top:30px;margin-bottom:20px;text-align:center;
}
.foot-bot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;color:rgba(223,220,211,.4);}
.foot-bot a{display:inline;color:rgba(223,220,211,.7);}

.byline{
  background:var(--plaster);border-top:1px solid var(--rule);padding:16px 36px;text-align:center;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);
}
.byline a{color:var(--copper);}

/* ══ RESPONSIVE ══ */
@media(max-width:1040px){
  .svcs{grid-template-columns:repeat(2,1fr);}
  .phases{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr 1fr;}
}
@media(max-width:820px){
  .nav{grid-template-columns:auto auto;}
  .nav-links{display:none;}
  .burger{display:flex;}
  .spec-in{grid-template-columns:1fr 1fr;}
  .spec-in > div:nth-child(2n){border-right:none;}
  .spec-in > div:nth-child(-n+2){border-bottom:1px solid var(--rule);}
  .split,.enq{grid-template-columns:1fr;}
  .projects{grid-template-columns:1fr;}
  .proj.wide{grid-column:span 1;}
  .proj.wide .proj-img{aspect-ratio:4/5;}
  .hero{min-height:86vh;}
}
@media(max-width:560px){
  .wrap{padding:0 20px;}
  .nav{padding:16px 20px;}
  .svcs{grid-template-columns:1fr;}
  .f-row{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr;}
  .ph-btn{grid-template-columns:34px 1fr;gap:12px;}
}