/* ============================================================
   STRATA COLLECTIVE — ink on concrete
   Display: Anton · Text: Archivo · Accent: safety orange
   ============================================================ */

:root{
  --paper:#e6e1d7;          /* warm raw concrete */
  --paper-deep:#d9d3c6;
  --ink:#131110;
  --ink-soft:#3a3733;
  --accent:#ff4d00;         /* safety orange — committed */
  --accent-ink:#c33a00;     /* AA-safe orange on paper for text */
  --flap:#1b1917;
  --flap-hi:#26231f;
  --display:'Anton', 'Arial Narrow', sans-serif;
  --text:'Archivo', 'Helvetica Neue', sans-serif;
  --rule:2px solid var(--ink);
  --pad:clamp(1.1rem, 4vw, 4rem);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} }

body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--text);
  font-size:1.0625rem;
  line-height:1.55;
  overflow-x:hidden;
  /* concrete grain */
  background-image:
    radial-gradient(ellipse 120% 80% at 20% 0%, rgba(255,255,255,.35), transparent 60%),
    repeating-linear-gradient(0deg, rgba(19,17,16,.022) 0 1px, transparent 1px 3px);
}

::selection{background:var(--accent);color:var(--paper)}
img,svg{max-width:100%}

/* ---------- a11y ---------- */
.skip-link{
  position:absolute;left:-999px;top:0;z-index:100;
  background:var(--ink);color:var(--paper);padding:.7rem 1.2rem;
  font-weight:800;text-decoration:none;
}
.skip-link:focus{left:0}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}

/* ---------- header ---------- */
.site-head{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.9rem var(--pad);
  border-bottom:var(--rule);
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter:blur(6px);
}
.wordmark{
  font-family:var(--display);font-size:1.35rem;letter-spacing:.04em;
  color:var(--ink);text-decoration:none;line-height:1;
}
.wordmark span{color:var(--accent)}
.head-nav{display:flex;gap:.2rem;list-style:none;flex-wrap:wrap}
.head-nav a{
  color:var(--ink);text-decoration:none;font-weight:600;font-size:.82rem;
  text-transform:uppercase;letter-spacing:.08em;padding:.45rem .6rem;
}
.head-nav a:hover{background:var(--ink);color:var(--paper)}
.nav-guide{border:2px solid var(--ink)}
.sound-toggle{
  font:inherit;font-weight:800;font-size:.72rem;letter-spacing:.12em;
  background:none;border:2px solid var(--ink);color:var(--ink);
  padding:.4rem .7rem;cursor:pointer;display:inline-flex;align-items:center;gap:.45rem;
}
.sound-toggle:hover{background:var(--ink);color:var(--paper)}
.sound-ind{width:.6rem;height:.6rem;background:var(--ink-soft);display:inline-block;border-radius:50%}
.sound-toggle[aria-pressed="true"] .sound-ind{background:var(--accent)}
.sound-toggle[aria-pressed="true"]{border-color:var(--accent);color:var(--accent-ink)}

/* ---------- hero ---------- */
.hero{
  min-height:calc(100svh - 62px);
  display:flex;flex-direction:column;justify-content:space-between;
  padding:1.4rem var(--pad) 1.2rem;
  position:relative;
}
.hero-kicker{
  font-weight:600;text-transform:uppercase;letter-spacing:.14em;font-size:.78rem;
  display:flex;align-items:center;gap:.6rem;color:var(--ink-soft);
}
.tick{width:.75rem;height:.75rem;background:var(--accent);display:inline-block}
.hero-title{
  font-family:var(--display);
  font-size:clamp(4.2rem, 17.5vw, 16.5rem);
  line-height:.88;
  text-transform:uppercase;
  letter-spacing:.005em;
  user-select:none;
  margin:.5rem 0;
}
.k-line{display:block;will-change:transform;transform-origin:left center}
.k-word{display:inline-block;position:relative}
.k-line--accent .k-word{
  color:var(--accent);
  -webkit-text-stroke:0;
}
/* slice effect layers (JS adds data-text) */
.k-word::before,.k-word::after{
  content:attr(data-text);
  position:absolute;left:0;top:0;color:inherit;
  pointer-events:none;opacity:0;
}
.hero.is-sliced .k-word::before{
  opacity:1;clip-path:inset(0 0 55% 0);
  transform:translateX(var(--slice,0px));
}
.hero.is-sliced .k-word::after{
  opacity:1;clip-path:inset(45% 0 0 0);
  transform:translateX(calc(var(--slice,0px) * -1));
}
.hero.is-sliced .k-word > .k-core{visibility:hidden}
.hero-foot{
  display:flex;justify-content:space-between;align-items:flex-end;gap:1rem;flex-wrap:wrap;
}
.hero-claim{font-size:clamp(1.05rem,2.2vw,1.5rem);font-weight:500;max-width:26ch}
.hero-scroll{font-size:.78rem;font-weight:600;letter-spacing:.14em;color:var(--ink-soft)}
.hero-rule{position:absolute;left:0;right:0;bottom:0;height:6px;background:var(--ink)}

/* ---------- section scaffolding ---------- */
section{padding:clamp(3.5rem,8vw,7rem) var(--pad)}
.sec-label{
  display:flex;align-items:baseline;gap:1rem;border-bottom:var(--rule);
  padding-bottom:.6rem;margin-bottom:clamp(2rem,5vw,3.5rem);
}
.sec-num{font-weight:800;font-size:.8rem;letter-spacing:.2em;color:var(--accent-ink)}
.sec-label h2{
  font-family:var(--display);font-size:clamp(1.6rem,4vw,2.6rem);
  text-transform:uppercase;letter-spacing:.02em;font-weight:400;
}

/* ---------- manifesto ---------- */
.manifesto{border-bottom:var(--rule)}
.pull{max-width:22ch}
.pull p{
  font-family:var(--display);
  font-size:clamp(1.9rem, 5.4vw, 4.6rem);
  line-height:1.04;text-transform:uppercase;font-weight:400;
}
.pull em{font-style:normal;color:var(--accent)}
.pull mark{background:var(--ink);color:var(--paper);padding:0 .12em}
.pull-1{margin-left:0}
.pull-2{margin:clamp(2.5rem,6vw,5rem) 0 0 auto;text-align:right}
.pull-3{margin:clamp(2.5rem,6vw,5rem) auto 0;transform:rotate(-1.2deg)}
.pull{opacity:0;translate:0 34px;transition:opacity .7s ease,translate .7s cubic-bezier(.2,.7,.2,1)}
.pull.in{opacity:1;translate:0 0}
.manifesto-fine{
  margin-top:clamp(3rem,7vw,5rem);max-width:52ch;
  border-left:6px solid var(--accent);padding-left:1.2rem;
}
.manifesto-fine p+p{margin-top:.8rem}
.fine-sign{font-weight:800;letter-spacing:.06em;text-transform:uppercase;font-size:.85rem}

/* ---------- capabilities / specimen ---------- */
.capabilities{border-bottom:var(--rule);background:var(--paper-deep)}
.spec-note{font-size:.85rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:2rem}
.specimen{list-style:none}
.spec-row{
  display:grid;grid-template-columns:5rem 1fr;grid-template-areas:"size term" "size def";
  gap:.2rem 1.2rem;align-items:baseline;
  padding:1.4rem 0;border-bottom:1px solid var(--ink);
}
.spec-row:last-child{border-bottom:none}
.spec-size{
  grid-area:size;font-weight:800;font-size:.75rem;letter-spacing:.12em;
  color:var(--accent-ink);align-self:start;padding-top:.5rem;
}
.spec-term{
  grid-area:term;font-family:var(--display);font-weight:400;
  font-size:var(--fs);line-height:1;text-transform:uppercase;
  transition:color .25s ease, letter-spacing .35s cubic-bezier(.2,.7,.2,1);
}
.spec-row:hover .spec-term{color:var(--accent);letter-spacing:.03em}
.spec-def{grid-area:def;max-width:52ch;color:var(--ink-soft);font-size:.98rem}

/* ---------- work / split-flap board ---------- */
.work{
  background:var(--ink);color:var(--paper);
  background-image:repeating-linear-gradient(0deg, rgba(230,225,215,.02) 0 1px, transparent 1px 4px);
}
.sec-label--invert{border-bottom-color:var(--paper)}
.sec-label--invert h2{color:var(--paper)}
.board-note{font-size:.85rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#9d968a;margin-bottom:1.6rem}
.board{border:2px solid #3a3630;background:#0c0b0a;padding:.9rem;overflow-x:auto}
.board-head{
  display:grid;grid-template-columns:minmax(15.5rem,2.2fr) minmax(12rem,1.4fr) 5rem minmax(9.6rem,1fr);
  gap:.9rem;padding:.35rem .35rem .75rem;
  font-size:.7rem;font-weight:800;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);
  min-width:46rem;
}
.board-row{
  display:grid;grid-template-columns:minmax(15.5rem,2.2fr) minmax(12rem,1.4fr) 5rem minmax(9.6rem,1fr);
  gap:.9rem;padding:.35rem;min-width:46rem;cursor:pointer;
}
.board-row:hover{background:rgba(255,77,0,.06)}
.flap-field{display:flex;gap:2px}
.flap{
  position:relative;width:1.05rem;height:1.55rem;flex:none;
  perspective:220px;
  font-family:var(--display);font-size:1.02rem;line-height:1;
  color:#efe9dd;
}
.flap-half{
  position:absolute;left:0;width:100%;height:50%;overflow:hidden;
  background:var(--flap);
  display:flex;justify-content:center;
  backface-visibility:hidden;
}
.flap-top{top:0;border-radius:2px 2px 0 0;align-items:flex-start;border-bottom:1px solid #000}
.flap-bottom{bottom:0;border-radius:0 0 2px 2px;align-items:flex-end;background:var(--flap-hi)}
.flap-half > span{
  height:1.55rem;display:flex;align-items:center;justify-content:center;width:100%;
  flex:none;
}
.flap-top > span{align-self:flex-start}
.flap-bottom > span{align-self:flex-end}
/* the animating leaf */
.flap-leaf{
  position:absolute;left:0;top:0;width:100%;height:50%;overflow:hidden;
  background:var(--flap);border-radius:2px 2px 0 0;
  display:flex;justify-content:center;
  transform-origin:bottom center;
  backface-visibility:hidden;z-index:2;
  border-bottom:1px solid #000;
  visibility:hidden;
}
.flap-leaf > span{height:1.55rem;display:flex;align-items:center;justify-content:center;width:100%}
.flap.is-flipping .flap-leaf{visibility:visible;animation:leaf-fall var(--dur,90ms) cubic-bezier(.55,0,.85,.5) forwards}
@keyframes leaf-fall{from{transform:rotateX(0deg)}to{transform:rotateX(-88deg)}}
.flap--accent{color:var(--accent)}
.board-fallback{width:100%;color:var(--paper);border-collapse:collapse}
.board-fallback td{padding:.5rem;border-bottom:1px solid #3a3630;font-family:var(--display);letter-spacing:.05em}

/* ---------- case studies ---------- */
.cases{
  margin-top:clamp(2.5rem,6vw,4.5rem);
  display:grid;grid-template-columns:repeat(2,1fr);gap:0;
  border:1px solid #3a3630;
}
.case{padding:clamp(1.4rem,3vw,2.4rem);border:1px solid #3a3630}
.case-head{display:flex;align-items:baseline;gap:.8rem;flex-wrap:wrap;margin-bottom:.9rem}
.case-idx{
  font-family:var(--display);font-size:1rem;color:var(--ink);
  background:var(--accent);width:1.7rem;height:1.7rem;
  display:inline-flex;align-items:center;justify-content:center;flex:none;
}
.case-head h3{font-family:var(--display);font-weight:400;font-size:clamp(1.4rem,2.6vw,2rem);text-transform:uppercase;letter-spacing:.02em}
.case-tag{font-size:.72rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:#9d968a}
.case p{color:#cfc8bb;max-width:56ch}
.case-metrics{display:flex;gap:1.6rem;margin-top:1.2rem;flex-wrap:wrap}
.case-metrics dt{font-size:.68rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:#9d968a}
.case-metrics dd{font-family:var(--display);font-size:clamp(1.2rem,2.4vw,1.7rem);color:var(--accent)}

/* ---------- process ---------- */
.process{border-bottom:var(--rule)}
.proc-list{list-style:none;counter-reset:step}
.proc-step{
  display:grid;grid-template-columns:minmax(4.5rem,8rem) 1fr;gap:1rem 2rem;
  padding:clamp(1.6rem,4vw,2.6rem) 0;border-bottom:1px solid var(--ink);
  align-items:start;
}
.proc-step:last-child{border-bottom:none}
.proc-no{
  font-family:var(--display);font-size:clamp(1.8rem,4.5vw,3.2rem);
  color:transparent;-webkit-text-stroke:1.5px var(--accent-ink);line-height:1;
}
.proc-step h3{
  font-family:var(--display);font-weight:400;text-transform:uppercase;
  font-size:clamp(1.5rem,3.4vw,2.4rem);margin-bottom:.4rem;letter-spacing:.02em;
}
.proc-step p{max-width:58ch;color:var(--ink-soft)}

/* ---------- studio ---------- */
.studio-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:clamp(2rem,5vw,4rem)}
.studio-big{
  font-family:var(--display);font-size:clamp(1.8rem,4.5vw,3.4rem);
  text-transform:uppercase;line-height:1.05;margin-bottom:1.2rem;
}
.studio-copy p+p{margin-top:.9rem;max-width:52ch;color:var(--ink-soft)}
.studio-copy strong{color:var(--accent-ink)}
.contact-mail{
  display:block;font-family:var(--display);
  font-size:clamp(1.3rem,3.2vw,2.3rem);color:var(--ink);text-decoration:none;
  border:var(--rule);padding:.9rem 1.1rem;text-align:center;text-transform:uppercase;
  transition:background .2s ease,color .2s ease;
  overflow-wrap:anywhere;
}
.contact-mail:hover{background:var(--accent);color:var(--ink)}
.contact-list{list-style:none;margin-top:1.4rem}
.contact-list li{
  display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  padding:.7rem 0;border-bottom:1px solid var(--ink);font-size:.95rem;
}
.contact-list li span:first-child{font-weight:800;text-transform:uppercase;font-size:.72rem;letter-spacing:.14em;align-self:center}
.contact-list a{color:var(--accent-ink)}

/* ---------- footer ---------- */
.site-foot{
  background:var(--ink);color:var(--paper);
  padding:clamp(2rem,5vw,3.5rem) var(--pad);
}
.foot-mark{
  font-family:var(--display);
  font-size:clamp(4rem,18vw,17rem);line-height:.85;color:var(--accent);
  user-select:none;margin-bottom:1rem;
}
.foot-meta{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.85rem;color:#9d968a}
.foot-meta a{color:var(--paper)}

/* ---------- guide page ---------- */
.guide-body{max-width:56rem;margin:0 auto;padding:0 var(--pad)}
.guide-hero{padding:clamp(3rem,8vw,6rem) 0 2rem;border-bottom:var(--rule)}
.guide-hero h1{font-family:var(--display);font-weight:400;font-size:clamp(2.6rem,8vw,5.5rem);line-height:.95;text-transform:uppercase}
.guide-hero p{margin-top:1rem;max-width:60ch;color:var(--ink-soft)}
.guide-sec{padding:clamp(2rem,5vw,3.5rem) 0;border-bottom:1px solid var(--ink)}
.guide-sec h2{font-family:var(--display);font-weight:400;text-transform:uppercase;font-size:clamp(1.6rem,4vw,2.6rem);margin-bottom:1rem}
.guide-sec h3{font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.95rem;margin:1.6rem 0 .5rem;color:var(--accent-ink)}
.guide-sec p{max-width:66ch;margin-bottom:.9rem}
.guide-sec ul,.guide-sec ol{margin:.5rem 0 1rem 1.3rem;max-width:64ch}
.guide-sec li{margin-bottom:.45rem}
.guide-sec pre{
  background:var(--ink);color:#e8e2d5;padding:1.1rem;overflow-x:auto;
  font-size:.82rem;line-height:1.5;margin:1rem 0;border-left:6px solid var(--accent);
}
.guide-sec code{font-family:ui-monospace,'SF Mono',Menlo,monospace}
.guide-sec p code, .guide-sec li code{background:var(--paper-deep);padding:.1em .35em;border:1px solid var(--ink);font-size:.85em}
.guide-table{width:100%;border-collapse:collapse;margin:1rem 0}
.guide-table th,.guide-table td{border:1px solid var(--ink);padding:.5rem .7rem;text-align:left;font-size:.9rem}
.guide-table th{background:var(--ink);color:var(--paper);text-transform:uppercase;font-size:.72rem;letter-spacing:.12em}
.pass{border-left:6px solid var(--accent);padding-left:1rem;margin:1.2rem 0}
.pass h3{margin-top:0}

/* ---------- 404 ---------- */
.nf-wrap{
  min-height:100svh;display:flex;flex-direction:column;justify-content:center;
  padding:var(--pad);position:relative;
}
.nf-code{
  font-family:var(--display);font-size:clamp(6rem,30vw,24rem);line-height:.85;
  color:var(--accent);
}
.nf-msg{font-family:var(--display);font-size:clamp(1.6rem,5vw,3.4rem);text-transform:uppercase;line-height:1;max-width:16ch;margin-top:1rem}
.nf-fine{margin-top:1.4rem;max-width:44ch;color:var(--ink-soft)}
.nf-link{
  display:inline-block;margin-top:2rem;border:var(--rule);padding:.8rem 1.4rem;
  font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--ink);text-decoration:none;
}
.nf-link:hover{background:var(--ink);color:var(--paper)}

/* ---------- responsive ---------- */
@media (max-width: 860px){
  .cases{grid-template-columns:1fr}
  .studio-grid{grid-template-columns:1fr}
}
@media (max-width: 700px){
  .site-head{flex-wrap:wrap}
  .head-nav a{padding:.4rem .45rem;font-size:.74rem}
  .spec-row{grid-template-columns:1fr;grid-template-areas:"size" "term" "def"}
  .spec-size{padding-top:0}
  .proc-step{grid-template-columns:1fr;gap:.3rem}
  .pull{max-width:100%}
  .pull-2,.pull-3{text-align:left;transform:none}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .pull{opacity:1;translate:0 0}
  .k-line{transform:none !important}
}