/* Invariance | Arc homepage, quiet-grid layout (2026-10-11 candidate).
   Self-contained: loads only this file plus hero-boundary.js. Other pages are unaffected. */

@font-face{font-family:'Libre Franklin Local';font-style:normal;font-weight:100 900;font-display:swap;src:url('fonts/libre-franklin-latin.woff2') format('woff2')}
@font-face{font-family:'Cormorant Local';font-style:normal;font-weight:300 700;font-display:swap;src:url('fonts/cormorant-latin.woff2') format('woff2')}
@font-face{font-family:'Cormorant Local';font-style:italic;font-weight:300 700;font-display:swap;src:url('fonts/cormorant-italic-latin.woff2') format('woff2')}

:root{
  --bg:#f5f3ee;
  --ink:#25282b;
  --ink-soft:#626568;
  --rule:#d7d5cf;
  --copper:#835e47;
  --copper-lit:#c89b7d;
  --teal:#3d6b6b;
  --teal-lit:#5aa3a3;
  --deck:#25282b;
  --on-deck:#f5f3ee;
  --on-deck-soft:#bdb9b1;
  --permit:#325e44;
  --defer:#7b5b20;
  --block:#8a4b37;
  --gutter:25px;
  --gap:20px;
  --sans:'Libre Franklin Local','Libre Franklin',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
  --serif:'Cormorant Local','Cormorant',Georgia,serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.5 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
img{display:block;max-width:100%;height:auto}
:focus-visible{outline:2px solid var(--copper);outline-offset:3px}
.skip-link{position:absolute;left:-9999px;top:8px;z-index:50;background:var(--ink);color:var(--bg);padding:10px 14px;text-decoration:none}
.skip-link:focus{left:var(--gutter)}

/* Grid */
.wrap{margin:0 var(--gutter)}
.grid{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));column-gap:var(--gap)}
.rule{border-top:1px solid var(--rule)}

/* Header */
.hdr{padding-top:22px}
.hdr .grid{align-items:start}
.brand{grid-column:1/7;font-weight:600;font-size:18px;line-height:1;letter-spacing:.08em;text-decoration:none;white-space:nowrap;padding-top:2px}
.brand em{font-family:var(--serif);font-style:italic;font-weight:500;letter-spacing:0;font-size:1.18em;color:var(--copper)}
.brand .pipe{color:var(--copper);font-weight:400;margin:0 .15em}
.nav-col{display:flex;flex-direction:column;gap:2px;font-weight:500;font-size:17px;line-height:1.25}
.nav-col a{text-decoration:none;width:max-content}
.nav-col a:hover{color:var(--copper)}
.nav-a{grid-column:9/12}
.nav-b{grid-column:12/15}
.nav-c{grid-column:15/17;text-align:right;align-items:flex-end}
.menu-btn{display:none}
.menu{display:none}

/* Intro */
.intro{padding-top:clamp(70px,9vw,130px)}
.wordmark{grid-column:1/-1;display:flex;align-items:flex-end;justify-content:space-between;gap:var(--gap)}
.wordmark h1{margin:0;font-weight:500;font-size:clamp(64px,14.6vw,250px);line-height:.8;letter-spacing:-.055em;margin-left:-.04em}
.scroll{font-weight:500;font-size:17px;text-decoration:none;white-space:nowrap;padding-bottom:.4em}
.scroll:hover{color:var(--copper)}
.intro .rule{margin-top:clamp(34px,4vw,56px)}

/* Section head: label left, statement right */
.sec{padding-top:clamp(90px,10vw,150px)}
.sec>.grid{border-top:1px solid var(--rule);padding-top:25px}
.intro-head{padding-top:25px}
.label{grid-column:1/9;display:flex;align-items:center;gap:8px;font-weight:600;font-size:17px;align-self:start;line-height:1.4}
.label::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--copper);flex:none}
.stmt{grid-column:9/16;margin:0;font-weight:500;font-size:clamp(21px,1.75vw,26px);line-height:1.22;letter-spacing:-.012em;text-wrap:pretty}
.stmt + .stmt{margin-top:.7em}
.sub{grid-column:9/16;margin:18px 0 0;font-size:17px;line-height:1.5;color:var(--ink-soft);text-wrap:pretty}
.note{grid-column:9/16;margin:28px 0 0;font-size:14px;line-height:1.5;color:var(--ink-soft)}

/* Figure band: the commitment-boundary field on charcoal */
.figure{margin:clamp(60px,7vw,100px) var(--gutter) 0;background:var(--deck);color:var(--on-deck)}
.figure>.wrap{margin:0 clamp(16px,3vw,48px)}
.figure .grid{padding:clamp(40px,5vw,72px) 0 clamp(28px,3vw,40px)}
.figure .field{grid-column:3/15}
.figure svg{display:block;width:100%;height:auto;overflow:visible}
.figure figcaption{grid-column:3/15;display:flex;justify-content:space-between;gap:var(--gap);margin-top:22px;padding-top:16px;border-top:1px solid rgba(245,243,238,.13);font-size:13.5px;line-height:1.55;color:var(--on-deck-soft)}
.figure figcaption span{max-width:62ch}
.figure figcaption b{font-weight:500;color:var(--copper-lit);white-space:nowrap}

/* Rows */
.rows{grid-column:1/-1;margin-top:clamp(60px,6vw,90px)}
.rows.tight{margin-top:56px}
.row{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));column-gap:var(--gap);padding:32px 0 15px;border-bottom:1px solid var(--rule);text-decoration:none;font-weight:500;font-size:18px;line-height:1.3;transition:border-color .18s ease,color .18s ease}
a.row:hover{border-bottom-color:var(--copper)}
a.row:hover .r-c{color:var(--copper)}
.r-a{grid-column:1/9}
.r-b{grid-column:9/15;color:var(--ink)}
.r-c{grid-column:15/17;text-align:right;font-variant-numeric:tabular-nums}
.row.key{color:var(--copper);border-bottom-color:var(--copper)}
.row.key .r-b{color:var(--copper)}
.rows-head{grid-column:1/-1;display:grid;grid-template-columns:repeat(16,minmax(0,1fr));column-gap:var(--gap);margin-top:56px;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft)}
.rows-head span:first-child{grid-column:1/9}
.rows-head span:last-child{grid-column:9/17}

/* Cases (why now, evidence) */
.case{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));column-gap:var(--gap);padding:36px 0 32px;border-bottom:1px solid var(--rule);text-decoration:none}
a.case:hover{border-bottom-color:var(--copper)}
a.case:hover .more{text-decoration:underline;text-underline-offset:3px}
.c-l{grid-column:1/9}
.c-r{grid-column:9/16}
.fig{font-weight:500;font-size:clamp(44px,4.4vw,64px);line-height:.9;letter-spacing:-.045em;font-variant-numeric:lining-nums}
.c-name{margin-top:18px;font-weight:500;font-size:18px;line-height:1.25}
.c-meta{margin-top:4px;font-size:14px;line-height:1.35;color:var(--ink-soft)}
.c-desc{margin:0;font-size:18px;line-height:1.42;text-wrap:pretty}
.c-q{margin:12px 0 0;font-size:15.5px;line-height:1.45;color:var(--ink-soft);text-wrap:pretty}
.more{display:inline-block;margin-top:14px;font-size:14.5px;font-weight:500;color:var(--copper)}

/* Determination record */
.record{grid-column:1/-1;margin-top:clamp(60px,6vw,90px)}
.rec-row{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));column-gap:var(--gap);padding:20px 0 12px;border-bottom:1px solid var(--rule);font-size:18px;line-height:1.3;font-weight:500}
.rec-row .k{grid-column:1/9;color:var(--ink-soft);font-weight:400}
.rec-row .v1{grid-column:9/13}
.rec-row .v2{grid-column:13/17}
.rec-row.hd{padding-top:0;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft)}
.rec-row.hd .k{font-weight:600}
.rec-row.changed .v2{color:var(--copper)}
.det{display:inline-flex;align-items:center;gap:9px}
.det::before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor}
.det.permit{color:var(--permit)}
.det.block{color:var(--block)}
.punch{grid-column:9/16;margin:30px 0 0;font-size:18px;line-height:1.45}
.punch strong{font-weight:600;color:var(--copper)}

/* Industries with photography */
.ind-list{grid-column:1/-1}
.ind{position:relative}
.ind .r-b{color:var(--ink-soft);font-weight:400}
.ind-img{display:none}
.thumb{position:fixed;left:0;top:0;width:320px;aspect-ratio:1.43/1;overflow:hidden;pointer-events:none;opacity:0;transform:translate(-50%,-50%) scale(.96);transition:opacity .2s ease,transform .25s ease;z-index:20;background:var(--deck)}
.thumb.on{opacity:1;transform:translate(-50%,-50%) scale(1)}
.thumb img{width:100%;height:100%;object-fit:cover}

/* Start */
.start-rows .row{font-size:18px}

/* Footer */
.ftr{padding:clamp(110px,12vw,170px) 0 28px}
.ftr .grid{border-top:1px solid var(--rule);padding-top:25px;font-size:15px;line-height:1.4}
.ftr .f-a{grid-column:1/9;color:var(--ink-soft)}
.ftr .f-b{grid-column:9/15;display:flex;flex-wrap:wrap;gap:6px 22px;font-weight:500}
.ftr .f-b a{text-decoration:none}
.ftr .f-b a:hover{color:var(--copper)}
.ftr .f-c{grid-column:15/17;text-align:right;font-weight:500;text-decoration:none;white-space:nowrap}
.ftr .f-c:hover{color:var(--copper)}

/* Tablet */
@media (max-width:991px){
  .nav-a{grid-column:7/11}.nav-b{grid-column:11/15}
  .stmt,.sub,.note,.punch,.c-r{grid-column:9/17}
  .figure .field,.figure figcaption{grid-column:1/-1}
}

/* Mobile */
@media (max-width:767px){
  :root{--gutter:16px;--gap:12px}
  .nav-col{display:none}
  .brand{grid-column:1/12}
  .menu-btn{display:block;grid-column:12/17;justify-self:end;background:none;border:0;padding:0;font:500 17px/1 var(--sans);color:var(--ink);cursor:pointer}
  .menu{grid-column:1/-1;padding:28px 0 8px}
  .menu.open{display:block}
  .menu a{display:block;padding:12px 0;border-bottom:1px solid var(--rule);font-size:22px;font-weight:500;text-decoration:none}
  .wordmark h1{font-size:19.5vw}
  .scroll{display:none}
  .label,.stmt,.sub,.note,.punch,.c-l,.c-r{grid-column:1/-1}
  .stmt{margin-top:18px}
  .label + .stmt{margin-top:18px}
  .r-a{grid-column:1/-1}
  .r-b{grid-column:1/-1;margin-top:6px;font-size:16px;font-weight:400;color:var(--ink-soft)}
  .row.key .r-b{color:var(--copper)}
  .r-c{display:none}
  .row{padding-top:24px}
  .c-r{margin-top:18px}
  .rows-head span:first-child{grid-column:1/-1}
  .rows-head span:last-child{display:none}
  .rec-row{font-size:16px}
  .rec-row .k{grid-column:1/-1;font-size:13px;letter-spacing:.1em;text-transform:uppercase;font-weight:600}
  .rec-row .v1{grid-column:1/9;margin-top:6px}
  .rec-row .v2{grid-column:9/17;margin-top:6px}
  .rec-row.hd .k{display:none}
  .figure .grid{padding:28px 0 20px}
  .figure figcaption{flex-direction:column;gap:6px}
  .ind-img{display:block;grid-column:1/-1;margin-bottom:14px;aspect-ratio:1.9/1;overflow:hidden}
  .ind-img img{width:100%;height:100%;object-fit:cover}
  .thumb{display:none}
  .ftr .f-a,.ftr .f-b,.ftr .f-c{grid-column:1/-1;text-align:left}
  .ftr .f-b,.ftr .f-c{margin-top:16px}
}
@media (hover:none){.thumb{display:none}}
@media (max-width:767px){
  .figure{margin-left:0;margin-right:0}
  .figure>.wrap{margin:0 var(--gutter)}
  .figure .field{padding-right:18px}
  .figure .ac-source-labels{font-size:27px;letter-spacing:1px}
  .figure .ac-outcome-labels{font-size:23px;letter-spacing:1px}
  .figure .ac-record text{font-size:21px}
  .figure #acField>text{font-size:25px;letter-spacing:1px}
  .figure .ac-incident-label text{font-size:22px}
}
h2.label{margin:0}
@media (min-width:992px){.figure .field,.figure figcaption{grid-column:4/14}}

/* Architectural photography: breaks between reading sections */
.ph{margin:0;overflow:hidden;background:var(--deck);aspect-ratio:4/5}
.ph img,.wide img{width:100%;height:100%;object-fit:cover}
.break{padding-top:clamp(90px,10vw,150px)}
.ph-doric{grid-column:1/8}
.pull{grid-column:9/16;align-self:end;margin:0;font-weight:500;font-size:clamp(28px,2.9vw,44px);line-height:1.12;letter-spacing:-.03em;text-wrap:balance}
.pull em{display:block;margin-top:.35em;font-family:var(--serif);font-style:italic;font-weight:500;letter-spacing:-.01em;font-size:1.12em;color:var(--copper)}
.band-img{padding-top:clamp(90px,10vw,150px)}
.wide{margin:0;overflow:hidden;background:var(--deck);aspect-ratio:16/7}
@media (max-width:767px){
  .break,.band-img{padding-top:90px}
  .ph-doric{grid-column:1/-1}
  .pull{grid-column:1/-1;margin-top:28px;font-size:28px}
  .wide{aspect-ratio:4/3}
}

/* Design-system alignment: teal on boundary elements, serif on section statements */
.brand em,.brand .pipe{color:var(--teal)}
.label::before{background:var(--teal)}
.row.key,.row.key .r-b{color:var(--teal)}
.row.key{border-bottom-color:var(--teal)}
.rec-row.changed .v2,.punch strong{color:var(--teal)}
.figure figcaption b{color:var(--teal-lit)}
.stmt{font-family:var(--serif);font-weight:500;font-size:clamp(27px,2.3vw,35px);line-height:1.14;letter-spacing:-.005em}
@media (max-width:767px){.row.key .r-b{color:var(--teal)}.stmt{font-size:27px}}

/* Meld: old-style identity on the new grid */
.label{font:600 12px/1.5 var(--sans);letter-spacing:.14em;text-transform:uppercase;color:var(--teal);padding-top:.5em}
.label::before{display:none}
.lockup{min-width:0}
.wordmark h1{font-size:clamp(44px,9.6vw,184px);line-height:.86;letter-spacing:-.035em;white-space:nowrap}
.wordmark h1 .pipe{color:var(--teal);font-weight:300;margin:0 .06em 0 .1em}
.wordmark h1 em{font-family:var(--serif);font-style:italic;font-weight:500;letter-spacing:-.01em;font-size:1.08em;color:var(--teal)}
.lockup-sub{margin:clamp(14px,1.6vw,26px) 0 0;font:500 clamp(12px,1vw,15px)/1 var(--sans);letter-spacing:.22em;text-transform:uppercase;color:var(--ink-soft)}
.sec.sec-ink{margin-top:clamp(90px,10vw,150px);padding:clamp(64px,7vw,110px) var(--gutter) clamp(72px,8vw,120px);background:var(--deck);color:var(--on-deck)}
.sec-ink>.grid{border-top-color:rgba(245,243,238,.16)}
.sec-ink .label{color:var(--teal-lit)}
.sec-ink .sub,.sec-ink .rec-row .k,.sec-ink .rec-row.hd{color:var(--on-deck-soft)}
.sec-ink .rec-row{border-bottom-color:rgba(245,243,238,.14)}
.sec-ink .rec-row.changed .v2,.sec-ink .punch strong{color:var(--teal-lit)}
.sec-ink :focus-visible{outline-color:var(--teal-lit)}
.det{padding:6px 13px 6px 11px;border:1px solid currentColor;border-radius:999px;font:600 12px/1 var(--sans);letter-spacing:.12em;text-transform:uppercase;background:color-mix(in srgb,currentColor 12%,transparent)}
.det::before{width:6px;height:6px}
.det.defer{color:var(--defer)}
.sec-ink .det.permit{color:#7cc0a6}
.sec-ink .det.defer{color:#d9b46e}
.sec-ink .det.block{color:#e09a82}
.ind-cards{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap);margin-top:clamp(60px,6vw,90px)}
.ind-card{display:flex;flex-direction:column;text-decoration:none;padding-bottom:22px;border-bottom:1px solid var(--rule);transition:border-color .18s ease}
.ic-img{margin:0;aspect-ratio:4/3;overflow:hidden;background:var(--deck)}
.ic-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s cubic-bezier(.4,0,.2,1)}
.ic-t{margin-top:20px;font-weight:500;font-size:19px;line-height:1.25}
.ic-d{margin:8px 0 0;font-size:16px;line-height:1.45;color:var(--ink-soft);text-wrap:pretty}
.ind-card .more{margin-top:auto;padding-top:16px}
.ind-card:hover{border-bottom-color:var(--copper)}
.ind-card:hover .ic-img img{transform:scale(1.03)}
.ind-card:hover .more{text-decoration:underline;text-underline-offset:3px}
@media (prefers-reduced-motion:reduce){.ic-img img{transition:none}}
.break .pull{font-family:var(--serif);font-weight:500;font-size:clamp(32px,3.4vw,54px);line-height:1.12;letter-spacing:-.01em;text-align:center;align-self:center;text-wrap:balance}
.break .pull em{font-size:1em;letter-spacing:-.005em}
.break .pull::before{content:"";display:block;width:1.6px;height:56px;margin:0 auto 32px;background:var(--teal)}
@media (max-width:991px){.ic-t{font-size:17px}.ic-d{font-size:15px}}
@media (max-width:767px){
  .wordmark h1{font-size:10.6vw}
  .sec.sec-ink{padding:56px var(--gutter) 64px;margin-top:90px}
  .ind-cards{grid-template-columns:1fr}
  .break .pull{font-size:32px}
  .label{padding-top:0}
}
.all-cases{grid-column:9/16;justify-self:start;margin-top:12px;text-decoration:none}
.all-cases:hover{text-decoration:underline;text-underline-offset:3px}
@media (max-width:991px){.all-cases{grid-column:9/17}}
@media (max-width:767px){.all-cases{grid-column:1/-1}}

/* Hero: columns photograph with the headline on the plain wall */
.intro{padding-top:clamp(24px,3vw,40px)}
.intro-hero{position:relative;aspect-ratio:16/7.4;overflow:hidden;background:#3f3d3a;display:flex;align-items:center}
.intro-hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 45%}
.intro-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(24,24,24,.5) 0%,rgba(24,24,24,.3) 30%,rgba(24,24,24,0) 34%)}
.intro-hero h1{position:relative;z-index:1;margin:0 0 0 clamp(20px,3.2vw,56px);font-family:var(--serif);font-weight:500;font-size:clamp(46px,6.2vw,116px);line-height:.92;letter-spacing:-.01em;color:#f5f3ee}
.intro-hero h1 em{font-family:var(--serif);font-style:italic;font-weight:500;letter-spacing:0;font-size:1em;color:#4a8585}
.intro .rule{margin-top:clamp(56px,7vw,110px)}
.figure{margin-top:clamp(32px,3.5vw,52px)}
@media (max-width:767px){.intro .rule{margin-top:48px}.figure{margin-top:32px}.intro-hero{aspect-ratio:4/5;align-items:flex-end}.intro-hero img{object-position:12% center}.intro-hero::after{background:linear-gradient(0deg,rgba(30,30,30,.6),rgba(30,30,30,0) 55%)}.intro-hero h1{margin:0 0 24px 20px;font-size:54px}}


/* Side margins: match the site header (48px, content capped at 1280px and centered) */
:root{--gutter:max(48px,calc((100% - 1280px) / 2))}
@media (max-width:1100px){:root{--gutter:32px}}
@media (max-width:680px){:root{--gutter:20px}}

/* Alternating section grounds: limestone and stone, full-bleed, so each new section reads as a new band */
#why-now,#problem,#industries{background:#eeebe4;box-shadow:0 0 0 100vmax #eeebe4;clip-path:inset(0 -100vmax);padding-bottom:clamp(90px,10vw,150px)}
#why-now>.grid,#problem>.grid,#industries>.grid{border-top-color:#d2cec5}
#industries .ind-card{background:#f5f3ee}
@media (max-width:767px){#why-now,#problem,#industries{padding-bottom:90px}}

/* Full-bleed hero and diagram band; headline aligns with the content margin */
.intro-hero,.figure{width:100vw;max-width:none;margin-left:calc(50% - 50vw)!important;margin-right:0!important}
.intro-hero{aspect-ratio:auto;height:clamp(420px,46vw,760px);padding-left:max(48px,calc((100vw - 1280px) / 2))}
.intro-hero h1{margin-left:0!important}
.figure>.wrap{margin:0 max(48px,calc((100vw - 1280px) / 2))}
@media (max-width:1100px){.intro-hero{padding-left:32px}.figure>.wrap{margin:0 32px}}
@media (max-width:767px){.intro-hero{height:auto;aspect-ratio:4/5;padding-left:20px}.figure>.wrap{margin:0 20px}}

/* Industry cards: inset text from the card edge */
.ind-card .ic-t,.ind-card .ic-d,.ind-card .more{padding-left:clamp(18px,1.8vw,26px);padding-right:clamp(18px,1.8vw,26px)}
.ind-card .ic-t{margin-top:22px}
.ind-card{padding-bottom:26px}