/* ERINIUM B003 · commercial surface · museum + laboratory + archival engineering
   Palette anchored to the registered mark's claimed colours:
   black #000000 · white #FFFFFF · dark gold #B88746 · light gold #F9F5A6 */

:root{
  --ink:#0A0A0C;
  --graphite:#131418;
  --panel:#1A1C21;
  --paper:#F3EEE2;
  --paper-deep:#E9E2D2;
  --stone:#CBC5B6;
  --muted:#9B968B;
  --bronze:#B88746;
  --bronze-soft:rgba(184,135,70,.34);
  --gold:#F9F5A6;
  --line:rgba(184,135,70,.22);
  --line-strong:rgba(184,135,70,.45);
  --font-display:"ERINIUM Display","Palatino Linotype",Palatino,"Book Antiqua",Georgia,"Times New Roman",serif;
  --font-sans:"ERINIUM Sans","Helvetica Neue",Helvetica,Arial,sans-serif;
  --measure:64ch;
  --pad:clamp(20px,5vw,72px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
body{
  margin:0;background:var(--ink);color:var(--paper);
  font-family:var(--font-display);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
p{margin:0 0 1em}
::selection{background:var(--bronze);color:var(--ink)}

.skip{position:absolute;left:-999px;top:0;background:var(--bronze);color:var(--ink);
  padding:10px 16px;z-index:99;font-family:var(--font-sans);font-size:13px}
.skip:focus{left:12px;top:12px}
:focus-visible{outline:2px solid var(--bronze);outline-offset:3px}

/* ---------- utility type ---------- */
.kicker{
  font-family:var(--font-sans);font-size:11px;letter-spacing:.3em;
  text-transform:uppercase;color:var(--bronze);margin:0 0 18px;
}
.display{
  font-weight:400;letter-spacing:.01em;line-height:1.08;margin:0 0 .5em;
  font-size:clamp(30px,4.6vw,58px);text-transform:uppercase;
}
.display em,.display i{font-style:italic;text-transform:none;letter-spacing:0}
.lede{font-size:clamp(17px,1.4vw,20px);color:var(--stone);max-width:var(--measure)}
.note{font-family:var(--font-sans);font-size:12.5px;letter-spacing:.04em;color:var(--muted);max-width:56ch}
.rule-line{border:0;border-top:1px solid var(--line);margin:0}

/* ---------- specimen frame — the recurring archival device ---------- */
.frame{position:relative;border:1px solid var(--line);padding:clamp(20px,3vw,34px)}
.frame::before,.frame::after{
  content:"";position:absolute;width:14px;height:14px;border:1px solid var(--bronze);
}
.frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}

/* ---------- header ---------- */
.site-head{
  position:sticky;top:0;z-index:40;background:rgba(10,10,12,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.site-head .bar{
  max-width:1280px;margin:0 auto;padding:0 var(--pad);
  display:flex;align-items:center;gap:26px;min-height:66px;
}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--font-sans);
  letter-spacing:.34em;font-size:14px;color:var(--paper)}
.brand img{width:30px;height:30px;object-fit:contain}
.brand sup{font-size:8px;letter-spacing:0;color:var(--bronze)}
.nav-main{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav-main a{font-family:var(--font-sans);font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--stone);padding:6px 0;border-bottom:1px solid transparent}
.nav-main a:hover{color:var(--paper);border-bottom-color:var(--bronze-soft)}
.nav-cta{border:1px solid var(--bronze-soft);padding:9px 16px!important;color:var(--paper)!important}
.nav-cta:hover{background:var(--bronze);color:var(--ink)!important}
.lang{display:flex;gap:10px;font-family:var(--font-sans);font-size:11px;letter-spacing:.12em}
.lang a{color:var(--muted);padding:4px 2px}
.lang a[aria-current="true"]{color:var(--bronze)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line-strong);
  color:var(--paper);font-family:var(--font-sans);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;padding:9px 14px;cursor:pointer}
@media(max-width:960px){
  .nav-toggle{display:block}
  .nav-main{display:none;position:absolute;left:0;right:0;top:66px;background:var(--graphite);
    border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;
    padding:18px var(--pad) 24px;gap:14px}
  .nav-main.open{display:flex}
  .lang{margin-top:8px}
}

/* ---------- section chrome ---------- */
.sec{position:relative;padding:clamp(72px,11vh,140px) var(--pad);border-top:1px solid var(--line)}
.sec-inner{max-width:1160px;margin:0 auto}
.folio{
  position:absolute;top:26px;right:var(--pad);
  font-family:var(--font-sans);font-size:10px;letter-spacing:.26em;color:var(--muted);
  text-transform:uppercase;
}
.body-copy{max-width:var(--measure);color:var(--stone);font-size:17.5px}

/* ---------- H01 hero ---------- */
.hero{border-top:0;min-height:92vh;display:flex;align-items:center;
  background:
    radial-gradient(1200px 620px at 78% -8%,rgba(184,135,70,.10),transparent 60%),
    radial-gradient(900px 520px at 12% 112%,rgba(184,135,70,.06),transparent 55%),
    var(--ink);
}
.hero .display{font-size:clamp(38px,6.4vw,86px);max-width:15ch}
.hero .lede{margin-top:22px}
.provenance{
  margin-top:34px;display:inline-block;font-family:var(--font-sans);
  font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--stone);
  border:1px solid var(--line);padding:12px 18px;
}
.cta-row{display:flex;flex-wrap:wrap;gap:16px;margin-top:40px}
.btn{font-family:var(--font-sans);font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  padding:15px 26px;border:1px solid var(--bronze);display:inline-block}
.btn-solid{background:var(--bronze);color:var(--ink)}
.btn-solid:hover{background:var(--gold);border-color:var(--gold)}
.btn-ghost{color:var(--paper)}
.btn-ghost:hover{background:rgba(184,135,70,.12)}

/* ---------- H02 knowledge map preview ---------- */
.map-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,70px);align-items:center}
.map-figure{background:var(--graphite)}
.map-figure svg{width:100%;height:auto;display:block}
@media(max-width:900px){.map-wrap{grid-template-columns:1fr}}

/* ---------- H03 two histories ---------- */
.lanes{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:38px}
.lane{background:var(--graphite);padding:clamp(22px,3vw,36px)}
.lane-label{font-family:var(--font-sans);font-size:11px;letter-spacing:.3em;color:var(--bronze);
  text-transform:uppercase;margin:0 0 14px}
.lane p{color:var(--stone);margin:0}
.convergence{
  margin-top:1px;border:1px solid var(--line-strong);border-top:0;
  padding:20px;text-align:center;font-family:var(--font-sans);
  letter-spacing:.24em;font-size:12.5px;text-transform:uppercase;color:var(--gold);
  background:linear-gradient(90deg,transparent,rgba(184,135,70,.10),transparent);
}
@media(max-width:760px){.lanes{grid-template-columns:1fr}}

/* ---------- H04 chain ---------- */
.chain{display:flex;flex-wrap:wrap;gap:10px;margin:34px 0 26px}
.chain li{list-style:none;font-family:var(--font-sans);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--paper);border:1px solid var(--line);padding:11px 14px;
  display:flex;align-items:center;gap:10px}
.chain li::after{content:"→";color:var(--bronze)}
.chain li:last-child{border-color:var(--bronze-soft)}
.chain li:last-child::after{content:""}
.chain{padding:0;margin-left:0}

/* ---------- H06 spark lockup ---------- */
.lockup{
  margin:40px 0 18px;font-size:clamp(20px,3vw,34px);letter-spacing:.06em;
  text-transform:uppercase;text-align:center;padding:clamp(26px,4vw,44px) 16px;
}
.lockup span{color:var(--bronze)}
.spark-line{text-align:center;font-style:italic;color:var(--stone)}

/* ---------- H07 constraint ---------- */
.constraint .display{max-width:22ch}
.constraint-line{font-family:var(--font-sans);letter-spacing:.2em;text-transform:uppercase;
  font-size:12px;color:var(--gold);margin:26px 0}

/* ---------- H08 knowledge system cards ---------- */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:40px}
.card{background:var(--graphite);padding:26px 22px 30px;min-height:190px;
  display:flex;flex-direction:column;gap:12px}
.card h3{font-family:var(--font-sans);font-size:11.5px;letter-spacing:.26em;margin:0;
  color:var(--paper);text-transform:uppercase}
.card p{color:var(--muted);font-size:14.5px;margin:0;flex:1}
.card .card-go{font-family:var(--font-sans);font-size:10.5px;letter-spacing:.2em;color:var(--bronze);
  text-transform:uppercase}
.card:hover{background:var(--panel)}
@media(max-width:960px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.cards{grid-template-columns:1fr}}

/* ---------- H09 method gates ---------- */
.principle{
  font-size:clamp(19px,2.2vw,26px);text-transform:uppercase;letter-spacing:.05em;
  border-left:2px solid var(--bronze);padding-left:22px;margin:36px 0;max-width:34ch;
}
.gates{display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0 0 26px;list-style:none}
.gates li{font-family:var(--font-sans);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--stone);border:1px solid var(--line);padding:10px 14px}

/* ---------- H10 product reveal — the vitrine ---------- */
.vitrine{
  background:var(--paper);color:var(--ink);border-top:1px solid var(--bronze-soft);
}
.vitrine .kicker{color:#8A6430}
.vitrine .display{color:var(--ink)}
.vitrine .body-copy{color:#4B463C}
.vitrine-stage{
  margin:46px auto 0;max-width:920px;background:var(--paper-deep);
  border:1px solid rgba(20,20,20,.14);padding:clamp(28px,5vw,56px);
  position:relative;
}
.vitrine-stage::before,.vitrine-stage::after{
  content:"";position:absolute;width:16px;height:16px;border:1px solid var(--bronze)}
.vitrine-stage::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.vitrine-stage::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,34px)}
.phase{aspect-ratio:3/4;display:flex;flex-direction:column;justify-content:space-between;
  padding:24px;border:1px solid rgba(20,20,20,.18)}
.phase .ph-name{font-family:var(--font-sans);letter-spacing:.34em;font-size:13px;text-transform:uppercase}
.phase .ph-role{font-family:var(--font-sans);letter-spacing:.16em;font-size:9.5px;text-transform:uppercase;opacity:.66}
.phase-white{background:linear-gradient(160deg,#FDFCF8,#EFEAE0);color:#191919}
.phase-black{background:linear-gradient(160deg,#191A1E,#0B0B0D);color:#F3EEE2;border-color:rgba(184,135,70,.5)}
.phase-mark{width:34px;height:1px;background:var(--bronze)}
.reveal-line{margin-top:26px;font-style:italic;text-align:center;color:#4B463C}
.status-badge{
  display:inline-block;margin-top:22px;font-family:var(--font-sans);font-size:10.5px;
  letter-spacing:.22em;text-transform:uppercase;color:#8A6430;
  border:1px solid rgba(138,100,48,.5);padding:10px 16px;background:rgba(184,135,70,.08)
}
.vitrine .btn{border-color:#8A6430;color:#3A2F1D}
.vitrine .btn:hover{background:#B88746;color:var(--paper)}
.vitrine-head{display:flex;flex-wrap:wrap;gap:8px 26px;align-items:baseline}
.vitrine-head .prod{font-family:var(--font-sans);letter-spacing:.3em;font-size:13px;text-transform:uppercase}
@media(max-width:640px){.duo{grid-template-columns:1fr}.phase{aspect-ratio:4/3}}

/* ---------- H11 ladder ---------- */
.ladder{margin-top:40px;border-top:1px solid var(--line)}
.rung{display:grid;grid-template-columns:220px 1fr auto;gap:24px;align-items:center;
  padding:26px 0;border-bottom:1px solid var(--line)}
.rung .r-name{font-family:var(--font-sans);letter-spacing:.3em;font-size:13px;text-transform:uppercase}
.rung p{margin:0;color:var(--stone);max-width:60ch}
.r-index{font-family:var(--font-sans);color:var(--muted);font-size:11px;letter-spacing:.2em}
@media(max-width:760px){.rung{grid-template-columns:1fr;gap:10px}}

/* ---------- H12 closing ---------- */
.closing{text-align:center}
.closing .display{margin-left:auto;margin-right:auto;max-width:26ch;font-size:clamp(24px,3.4vw,40px)}
.closing .cta-row{justify-content:center}

/* ---------- generic content pages ---------- */
.page-head{padding-top:clamp(84px,14vh,150px)}
.prose-sec{border-top:1px solid var(--line);padding:clamp(44px,7vh,80px) 0}
.prose-sec h2{font-size:clamp(22px,2.6vw,32px);text-transform:uppercase;letter-spacing:.02em;
  font-weight:400;margin:0 0 18px;max-width:28ch}
.prose-sec h3{font-family:var(--font-sans);font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--bronze);margin:34px 0 12px}
.status-line{font-family:var(--font-sans);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold);border:1px solid var(--line-strong);display:inline-block;padding:9px 14px;margin:0 0 26px}
.boundary{border:1px solid var(--line);padding:20px 24px;color:var(--muted);
  font-family:var(--font-sans);font-size:13px;letter-spacing:.03em;max-width:70ch;margin-top:36px}

/* materia cards */
.materia-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:38px}
.materia-card{background:var(--graphite);padding:26px 22px}
.materia-card h3{margin:0 0 6px;font-size:17px;font-style:italic;font-weight:400;letter-spacing:.02em}
.materia-card .m-status{font-family:var(--font-sans);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--bronze);display:block;margin-bottom:14px}
.materia-card p{color:var(--muted);font-size:14.5px;margin:0}
@media(max-width:960px){.materia-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.materia-grid{grid-template-columns:1fr}}

/* gates detail */
.gate-list{counter-reset:g;padding:0;margin:36px 0 0;list-style:none;border-top:1px solid var(--line)}
.gate-list li{display:grid;grid-template-columns:70px 240px 1fr;gap:22px;
  padding:24px 0;border-bottom:1px solid var(--line)}
.gate-list .g-n{font-family:var(--font-sans);color:var(--bronze);letter-spacing:.2em;font-size:12px}
.gate-list .g-t{font-family:var(--font-sans);letter-spacing:.2em;font-size:12px;text-transform:uppercase}
.gate-list p{margin:0;color:var(--stone)}
@media(max-width:820px){.gate-list li{grid-template-columns:56px 1fr}.gate-list p{grid-column:2}}

/* ---------- allocation form ---------- */
.form-wrap{max-width:760px}
form.pa{margin-top:44px;display:grid;gap:26px}
fieldset{border:1px solid var(--line);padding:24px 22px 28px;margin:0}
legend{font-family:var(--font-sans);font-size:11px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--bronze);padding:0 10px}
label{display:block;font-family:var(--font-sans);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--stone);margin:18px 0 8px}
input[type=text],input[type=email],input[type=tel],select,textarea{
  width:100%;background:var(--graphite);border:1px solid var(--line);color:var(--paper);
  font-family:var(--font-display);font-size:16px;padding:13px 14px;border-radius:0;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--bronze)}
textarea{min-height:110px;resize:vertical}
.choice-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:6px}
.choice-row label{display:flex;align-items:center;gap:10px;margin:0;border:1px solid var(--line);
  padding:12px 16px;cursor:pointer;text-transform:none;letter-spacing:.04em;font-size:13px;color:var(--paper)}
.choice-row input{accent-color:var(--bronze)}
.check-row{display:flex;gap:12px;align-items:flex-start;margin-top:16px;
  font-family:var(--font-sans);font-size:12.5px;letter-spacing:.02em;color:var(--stone)}
.check-row input{margin-top:3px;accent-color:var(--bronze)}
.form-note{font-family:var(--font-sans);font-size:12px;color:var(--muted);letter-spacing:.03em}
.fallback-panel{border:1px solid var(--line-strong);padding:24px;margin-top:30px;color:var(--stone)}
.fallback-panel[hidden]{display:none}
.contact-lines{margin-top:18px;display:grid;gap:8px;font-family:var(--font-sans);
  font-size:13px;letter-spacing:.04em}
.contact-lines a{color:var(--paper);border-bottom:1px solid var(--bronze-soft)}
.hp-field{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--line);padding:56px var(--pad) 44px;background:var(--graphite)}
.foot-grid{max-width:1160px;margin:0 auto;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.foot-brand{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.foot-brand img{width:40px;height:40px;object-fit:contain}
.foot-brand span{font-family:var(--font-sans);letter-spacing:.3em;font-size:13px}
.site-foot p{color:var(--muted);font-family:var(--font-sans);font-size:12px;letter-spacing:.03em;max-width:52ch}
.foot-h{font-family:var(--font-sans);font-size:10.5px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--bronze);margin:0 0 14px}
.foot-list{list-style:none;padding:0;margin:0;display:grid;gap:9px}
.foot-list a,.foot-list span{font-family:var(--font-sans);font-size:12.5px;letter-spacing:.05em;color:var(--stone)}
.foot-list a:hover{color:var(--paper)}
.foot-legal{max-width:1160px;margin:44px auto 0;padding-top:22px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px 30px;font-family:var(--font-sans);
  font-size:11px;letter-spacing:.06em;color:var(--muted)}
@media(max-width:860px){.foot-grid{grid-template-columns:1fr}}

/* reveal on scroll (progressive) */
.js .rv{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
.js .rv.in{opacity:1;transform:none}