/* ============================================================
   CEPHI — Synthesized Bonds
   Design system: porcelain / carbon. No accent colour.
   Display: Marcellus · Body: Instrument Sans · Labels: Fragment Mono
   ============================================================ */

:root{
  --paper:#FBFAF8;
  --bone:#F1EEE8;
  --ink:#121210;
  --carbon:#0C0C0B;
  --graphite:#56534C;
  --mist:#8B877E;
  --line:#DCD7CD;
  --line-dark:#2B2B29;
  --titan:#C8C4BB;
  --gold:#9C7A3C;
  --gold-soft:#C2A264;

  --font-display:'Marcellus', serif;
  --font-body:'Instrument Sans', -apple-system, sans-serif;
  --font-mono:'Fragment Mono', monospace;

  --w-max:1240px;
  --w-text:660px;
  --pad-x:clamp(20px, 5vw, 64px);
  --sec-y:clamp(88px, 12vw, 160px);
  --header-h:72px;
}

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

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

body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

::selection{ background:var(--ink); color:var(--paper); }

img,svg{ display:block; max-width:100%; }
a{ color:inherit; }

:focus-visible{
  outline:1px solid var(--ink);
  outline-offset:4px;
}
.on-carbon :focus-visible{ outline-color:var(--paper); }

/* ---------- type ---------- */

h1,h2,h3,.display{
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.12;
  letter-spacing:.02em;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.32em;
  text-transform:uppercase;
  color:var(--gold);
  display:block;
  margin-bottom:26px;
}
.on-carbon .eyebrow{ color:var(--gold-soft); opacity:.9; }

.standfirst{
  font-size:clamp(19px, 2.2vw, 23px);
  line-height:1.65;
  color:var(--graphite);
  max-width:var(--w-text);
}
.on-carbon .standfirst{ color:var(--titan); }

.muted{ color:var(--graphite); }
.on-carbon .muted{ color:var(--titan); }

.mono{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.serif-note{
  font-family:var(--font-display);
  font-size:clamp(22px, 3vw, 32px);
  line-height:1.4;
}

/* ---------- layout ---------- */

.wrap{ max-width:var(--w-max); margin:0 auto; padding-inline:var(--pad-x); }
.wrap-text{ max-width:calc(var(--w-text) + 2*var(--pad-x)); margin:0 auto; padding-inline:var(--pad-x); }

.section{ padding-block:var(--sec-y); }
.section--tight{ padding-block:clamp(64px, 8vw, 104px); }
.section--bone{ background:var(--bone); }
.section--carbon{ background:var(--carbon); color:var(--paper); }

.hairline{ border:0; border-top:1px solid var(--line); }
.on-carbon .hairline, .section--carbon .hairline{ border-color:var(--line-dark); }

/* ---------- header ---------- */

.site-header{
  position:sticky; top:0; z-index:50;
  background:color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  height:var(--header-h);
}
.site-header .wrap{
  height:100%;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
}

.nav-left{ display:flex; gap:clamp(16px, 2.4vw, 34px); }
.nav-right{ display:flex; gap:clamp(16px, 2.4vw, 28px); justify-content:flex-end; align-items:center; }

.nav-link{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.26em;
  text-transform:uppercase;
  text-decoration:none;
  color:var(--graphite);
  padding-block:6px;
  border-bottom:1px solid transparent;
  transition:color .2s ease, border-color .2s ease;
  white-space:nowrap;
}
.nav-link:hover{ color:var(--ink); }
.nav-link[aria-current="page"]{ color:var(--ink); border-bottom-color:var(--ink); }

.wordmark{
  font-family:var(--font-display);
  font-size:21px;
  letter-spacing:.44em;
  text-indent:.44em; /* optical centering of tracked caps */
  text-decoration:none;
  color:var(--ink);
  text-align:center;
}

/* buttons */
.btn{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  text-decoration:none;
  padding:15px 30px;
  border:1px solid var(--ink);
  color:var(--ink);
  background:transparent;
  cursor:pointer;
  transition:background .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn:hover{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.btn:not(.btn--solid):hover{ background:transparent; color:var(--gold); border-color:var(--gold); }
.btn--solid{ background:var(--ink); color:var(--paper); }
.btn--solid:hover{ background:transparent; color:var(--ink); }
.btn--small{ padding:11px 20px; font-size:10px; }

.section--carbon .btn, .on-carbon .btn{
  border-color:var(--paper); color:var(--paper);
}
.section--carbon .btn:hover, .on-carbon .btn:hover{ background:var(--paper); color:var(--carbon); }
.section--carbon .btn--solid{ background:var(--paper); color:var(--carbon); }
.section--carbon .btn--solid:hover{ background:transparent; color:var(--paper); }

.text-link{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  text-decoration:none;
  color:var(--ink);
  border-bottom:1px solid var(--ink);
  padding-bottom:4px;
  transition:opacity .2s ease;
}
.text-link:hover{ opacity:.55; }
.section--carbon .text-link, .on-carbon .text-link{ color:var(--paper); border-color:var(--paper); }

/* mobile nav */
.nav-toggle{ display:none; }

@media (max-width: 880px){
  .site-header .wrap{ grid-template-columns:auto 1fr auto; }
  .nav-left, .nav-right .nav-link, .nav-right .btn{ display:none; }
  .wordmark{ text-align:left; text-indent:0; letter-spacing:.34em; order:-1; }
  .nav-toggle{
    display:flex; flex-direction:column; justify-content:center; gap:6px;
    width:44px; height:44px; margin-right:-10px;
    background:none; border:0; cursor:pointer; align-items:center;
  }
  .nav-toggle span{ display:block; width:22px; height:1px; background:var(--ink); transition:transform .3s ease, opacity .3s ease; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1){ transform:translateY(3.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2){ transform:translateY(-3.5px) rotate(-45deg); }

  .mobile-menu{
    position:fixed; inset:var(--header-h) 0 0 0; z-index:49;
    background:var(--paper);
    display:none;
    flex-direction:column;
    padding:48px var(--pad-x);
    gap:4px;
    overflow-y:auto;
  }
  .mobile-menu.is-open{ display:flex; }
  .mobile-menu a{
    font-family:var(--font-display);
    font-size:30px;
    text-decoration:none;
    color:var(--ink);
    padding:14px 0;
    border-bottom:1px solid var(--line);
  }
  .mobile-menu .mobile-cta{ margin-top:36px; }
  .mobile-menu .mobile-cta a{ border-bottom:0; padding:0; }
  body.menu-open{ overflow:hidden; }
}
@media (min-width: 881px){ .mobile-menu{ display:none !important; } }

/* ---------- hero (home) ---------- */

.hero{
  min-height:calc(100svh - var(--header-h));
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  text-align:center;
  padding:clamp(48px,7vw,80px) var(--pad-x) clamp(56px,8vw,96px);
  position:relative;
}

.hero-octa{ width:clamp(110px, 14vw, 150px); margin-bottom:clamp(32px, 5vw, 48px); }
.hero-octa path, .hero-octa line{
  fill:none; stroke:var(--gold); stroke-width:.8;
  vector-effect:non-scaling-stroke;
}
.draw path, .draw line{
  stroke-dasharray:1200; stroke-dashoffset:1200;
  animation:draw 2.2s cubic-bezier(.4,0,.2,1) forwards;
}
.draw path:nth-child(2), .draw line:nth-child(2){ animation-delay:.25s; }
.draw path:nth-child(3), .draw line:nth-child(3){ animation-delay:.5s; }
.draw path:nth-child(4), .draw line:nth-child(4){ animation-delay:.7s; }
.draw path:nth-child(5), .draw line:nth-child(5){ animation-delay:.9s; }
@keyframes draw{ to{ stroke-dashoffset:0; } }
.hero-octa path.octa-c{
  fill:var(--ink); stroke:none;
  stroke-dasharray:none; stroke-dashoffset:0;
  opacity:0; animation:markfade .9s ease .9s forwards;
}
@keyframes markfade{ to{ opacity:1; } }
@media (prefers-reduced-motion: reduce){
  .draw path, .draw line{ animation:none; stroke-dashoffset:0; }
  .hero-octa path.octa-c{ animation:none; opacity:1; }
}

.hero-title{
  font-size:clamp(58px, 11vw, 138px);
  letter-spacing:.30em;
  text-indent:.30em;
  line-height:1;
}
.hero-sub{
  margin-top:clamp(20px, 3vw, 30px);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.42em;
  text-transform:uppercase;
  color:var(--graphite);
}
.hero-thesis{
  margin-top:clamp(32px, 4.5vw, 52px);
  max-width:620px;
  color:var(--graphite);
  font-size:clamp(16px, 1.9vw, 18px);
}
.hero-actions{
  margin-top:clamp(36px, 5vw, 56px);
  display:flex; gap:18px; flex-wrap:wrap; justify-content:center;
}

/* ---------- chapter head (interior pages) ---------- */

.chapter{
  padding:clamp(72px, 10vw, 128px) 0 clamp(48px, 6vw, 72px);
  border-bottom:1px solid var(--line);
}
.chapter h1{ font-size:clamp(40px, 6.4vw, 72px); letter-spacing:.06em; max-width:900px; }
.chapter .standfirst{ margin-top:28px; }
.chapter--carbon{ background:var(--carbon); color:var(--paper); border-bottom-color:var(--line-dark); }

/* ---------- lineage split (home) ---------- */

.lineage{ display:grid; grid-template-columns:1fr 1fr; }
.lineage-panel{
  padding:clamp(72px, 9vw, 128px) var(--pad-x);
  display:flex; flex-direction:column; align-items:flex-start;
  border-top:1px solid var(--line);
  min-height:520px;
}
.lineage-panel + .lineage-panel{ border-left:1px solid var(--line); }
.lineage-panel--bone{ background:var(--bone); }
.lineage-motif{ width:104px; margin-bottom:44px; }
.lineage-motif path, .lineage-motif circle, .lineage-motif line{
  fill:none; stroke:var(--ink); stroke-width:.9;
}
.lineage-panel h2{ font-size:clamp(30px, 3.6vw, 44px); letter-spacing:.14em; }
.lineage-panel p{ margin-top:22px; max-width:440px; color:var(--graphite); flex-grow:1; }
.lineage-panel .text-link{ margin-top:36px; }

@media (max-width: 780px){
  .lineage{ grid-template-columns:1fr; }
  .lineage-panel + .lineage-panel{ border-left:0; }
  .lineage-panel{ min-height:0; }
}

/* ---------- protocol strip / step grids ---------- */

.steps{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(190px, 1fr));
  gap:0;
  border-top:1px solid var(--line-dark);
}
.step{
  padding:40px 26px 46px 0;
  border-bottom:1px solid var(--line-dark);
}
.step + .step{ padding-left:26px; border-left:1px solid var(--line-dark); }
.step .idx{
  font-family:var(--font-mono); font-size:11px; letter-spacing:.3em;
  color:var(--titan); opacity:.7; display:block; margin-bottom:18px;
}
.step h3{ font-size:19px; letter-spacing:.1em; margin-bottom:12px; }
.step p{ font-size:14.5px; line-height:1.65; color:var(--titan); }

@media (max-width: 980px){
  .steps{ grid-template-columns:1fr; }
  .step, .step + .step{ padding:28px 0; border-left:0; }
}

/* light variant on protocol page */
.section:not(.section--carbon) .steps{ border-top-color:var(--line); }
.section:not(.section--carbon) .step{ border-bottom-color:var(--line); }
.section:not(.section--carbon) .step + .step{ border-left-color:var(--line); }
.section:not(.section--carbon) .step .idx{ color:var(--mist); opacity:1; }
.section:not(.section--carbon) .step p{ color:var(--graphite); }

/* ---------- figure / spec tables ---------- */

.spec-table{ width:100%; border-collapse:collapse; }
.spec-table th, .spec-table td{
  text-align:left; padding:20px 8px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.spec-table th{
  font-family:var(--font-mono); font-weight:400; font-size:11px;
  letter-spacing:.26em; text-transform:uppercase; color:var(--mist);
  width:44%;
}
.spec-table td{ font-family:var(--font-display); font-size:clamp(18px, 2.2vw, 24px); letter-spacing:.04em; }
.spec-table small{ display:block; font-family:var(--font-body); font-size:13.5px; color:var(--graphite); letter-spacing:0; margin-top:6px; line-height:1.6; }

.section--carbon .spec-table th{ color:var(--titan); opacity:.8; }
.section--carbon .spec-table th, .section--carbon .spec-table td{ border-bottom-color:var(--line-dark); }
.section--carbon .spec-table small{ color:var(--titan); }

/* big material figure */
.material-fig{
  font-family:var(--font-display);
  font-size:clamp(88px, 16vw, 190px);
  line-height:1;
  letter-spacing:.02em;
}
.material-fig sup{
  font-family:var(--font-mono);
  font-size:clamp(14px, 2vw, 20px);
  letter-spacing:.3em;
  vertical-align:super;
}

/* ---------- assurance columns ---------- */

.cols-3{
  display:grid; grid-template-columns:repeat(3, 1fr);
  gap:clamp(32px, 5vw, 72px);
}
.cols-3 h3{ font-size:20px; letter-spacing:.1em; margin:20px 0 14px; }
.cols-3 p{ font-size:15px; color:var(--graphite); }
.glyph{ width:40px; height:40px; }
.glyph path, .glyph circle, .glyph rect, .glyph line{ fill:none; stroke:var(--ink); stroke-width:1; }
@media (max-width: 860px){ .cols-3{ grid-template-columns:1fr; } }

/* ---------- prose blocks (science / protocol body) ---------- */

.prose{ max-width:var(--w-text); }
.prose h2{ font-size:clamp(28px, 3.6vw, 40px); letter-spacing:.06em; margin-bottom:26px; }
.prose h3{ font-size:21px; letter-spacing:.08em; margin:44px 0 16px; }
.prose p + p{ margin-top:20px; }
.prose p{ color:var(--graphite); }
.section--carbon .prose p{ color:var(--titan); }
.prose .lede{ font-size:19px; color:var(--ink); }
.section--carbon .prose .lede{ color:var(--paper); }

.chapter-num{
  font-family:var(--font-mono);
  font-size:11px; letter-spacing:.32em; text-transform:uppercase;
  color:var(--mist); display:block; margin-bottom:22px;
}
.section--carbon .chapter-num{ color:var(--gold-soft); opacity:.9; }

/* two-column science layout: sticky label + prose */
.duo{
  display:grid; grid-template-columns:minmax(180px, 300px) minmax(0, 1fr);
  gap:clamp(32px, 6vw, 96px);
  align-items:start;
}
.duo-label{ position:sticky; top:calc(var(--header-h) + 40px); }
.duo-label .serif-note{ max-width:240px; }
@media (max-width: 820px){
  .duo{ grid-template-columns:1fr; }
  .duo-label{ position:static; }
}

/* ---------- FAQ ---------- */

.faq-list{ max-width:820px; }
.faq-item{ border-bottom:1px solid var(--line); }
.faq-item summary{
  list-style:none; cursor:pointer;
  display:flex; justify-content:space-between; align-items:baseline; gap:24px;
  padding:30px 0;
  font-family:var(--font-display);
  font-size:clamp(18px, 2.4vw, 23px);
  letter-spacing:.03em;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:'+';
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--mist);
  flex-shrink:0;
  transition:transform .25s ease;
}
.faq-item[open] summary::after{ transform:rotate(45deg); color:var(--gold); }
.faq-item summary:hover::after{ color:var(--gold); }
.faq-item .answer{ padding:0 0 34px; max-width:660px; color:var(--graphite); }
.faq-item .answer p + p{ margin-top:14px; }

/* ---------- consultation form ---------- */

.form-grid{ display:grid; gap:38px; max-width:680px; }
.field label{
  display:block;
  font-family:var(--font-mono); font-size:11px;
  letter-spacing:.28em; text-transform:uppercase;
  color:var(--graphite); margin-bottom:12px;
}
.field input, .field select, .field textarea{
  width:100%;
  font-family:var(--font-body); font-size:17px;
  color:var(--ink);
  background:transparent;
  border:0; border-bottom:1px solid var(--line);
  padding:10px 2px 14px;
  border-radius:0;
  transition:border-color .2s ease;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-bottom-color:var(--ink);
}
.field textarea{ resize:vertical; min-height:120px; }
.field select{
  appearance:none; -webkit-appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23121210'/%3E%3C/svg%3E");
  background-repeat:no-repeat; background-position:right 4px center;
  cursor:pointer;
}
.field-row{ display:grid; grid-template-columns:1fr 1fr; gap:38px; }
@media (max-width: 640px){ .field-row{ grid-template-columns:1fr; } }
.form-note{ font-size:13.5px; color:var(--mist); max-width:560px; }
.hidden{ display:none !important; }

/* ---------- footer ---------- */

.site-footer{
  border-top:1px solid var(--line);
  padding:clamp(56px, 8vw, 96px) 0 40px;
  background:var(--paper);
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1.4fr;
  gap:clamp(28px, 4vw, 56px);
}
.footer-brand .wordmark{ font-size:24px; text-align:left; text-indent:0; }
.atomic-mark{
  margin-top:20px;
  font-family:var(--font-mono); font-size:11px; letter-spacing:.3em;
  color:var(--gold);
}
.footer-col h4{
  font-family:var(--font-mono); font-weight:400; font-size:10.5px;
  letter-spacing:.3em; text-transform:uppercase; color:var(--mist);
  margin-bottom:20px;
}
.footer-col a{
  display:block; text-decoration:none; color:var(--graphite);
  font-size:14.5px; padding:5px 0;
  transition:color .2s ease;
}
.footer-col a:hover{ color:var(--gold); }
.footer-legal{
  margin-top:clamp(48px, 7vw, 80px);
  padding-top:28px;
  border-top:1px solid var(--line);
  display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap;
  font-size:12.5px; color:var(--mist);
}
@media (max-width: 860px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width: 520px){ .footer-grid{ grid-template-columns:1fr; } }

/* ---------- reveal on scroll ---------- */

[data-reveal]{
  opacity:0; transform:translateY(22px);
  transition:opacity .8s cubic-bezier(.2,.6,.2,1), transform .8s cubic-bezier(.2,.6,.2,1);
}
[data-reveal].is-in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){
  [data-reveal]{ opacity:1; transform:none; transition:none; }
}

/* ---------- utilities ---------- */

.center{ text-align:center; }
.mt-1{ margin-top:16px; } .mt-2{ margin-top:28px; } .mt-3{ margin-top:44px; } .mt-4{ margin-top:64px; }
.mb-2{ margin-bottom:28px; } .mb-3{ margin-bottom:44px; }
.flex-center{ display:flex; justify-content:center; }
.cta-band h2{ font-size:clamp(30px, 4.4vw, 52px); letter-spacing:.06em; max-width:760px; margin-inline:auto; }


/* ---------- gold accents ---------- */

.gold-rule{ width:64px; height:1px; background:var(--gold); margin:14px 0 16px; border:0; }
.text-link:hover{ color:var(--gold); border-color:var(--gold); }
.section--carbon .text-link:hover, .on-carbon .text-link:hover{ color:var(--gold-soft); border-color:var(--gold-soft); }

/* ---------- photography: framed figure ---------- */

.fig{
  border:1px solid var(--line);
  background:var(--bone);
  padding:10px;
}
.fig img{ display:block; width:100%; height:auto; }
.fig--tall img{ aspect-ratio:1/1; object-fit:cover; }

/* ---------- setting plates gallery ---------- */

.plates{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:clamp(28px, 4vw, 48px);
  margin-top:clamp(40px, 6vw, 64px);
}
.plate{ border:1px solid var(--line); background:var(--paper); }
.plate-img{ position:relative; border-bottom:1px solid var(--line); background:var(--bone); }
.plate-img img{ display:block; width:100%; aspect-ratio:1/1; object-fit:cover; }
.plate .roman{
  position:absolute; top:16px; left:20px;
  font-family:var(--font-display); font-size:clamp(30px, 4vw, 42px);
  color:var(--gold); line-height:1;
}
.plate-txt{ padding:28px 30px 34px; }
.plate-txt h3{ font-size:clamp(20px, 2.6vw, 26px); letter-spacing:.04em; }
.plate-txt .desc{ color:var(--graphite); font-size:15px; line-height:1.7; }
.plate--wide{ grid-column:1 / -1; max-width:560px; margin-inline:auto; width:100%; }
@media (max-width: 720px){ .plates{ grid-template-columns:1fr; } .plate--wide{ max-width:none; } }

/* ---------- home settings strip ---------- */

.strip{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:clamp(20px, 3vw, 36px);
  margin-top:clamp(36px, 5vw, 56px);
}
.strip .plate-img{ border:1px solid var(--line); border-bottom:1px solid var(--line); }
@media (max-width: 720px){ .strip{ grid-template-columns:1fr; } }

/* ---------- reference figures (wide) ---------- */

.ref-fig{ margin-top:clamp(40px, 6vw, 64px); }
.ref-fig .mono{ color:var(--gold); display:block; margin-bottom:14px; }
.on-carbon .ref-fig .mono{ color:var(--gold-soft); }
.ref-fig figcaption{
  margin-top:14px; font-size:14px; color:var(--graphite);
  max-width:660px; line-height:1.7;
}
.on-carbon .ref-fig figcaption{ color:var(--titan); }


/* ---------- atelier rail ---------- */

.rail-tabs{ display:flex; gap:26px; margin-top:30px; }
.rail-tab{
  background:none; border:0; cursor:pointer; padding:0 0 6px;
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.22em;
  text-transform:uppercase; color:var(--mist);
  border-bottom:1px solid transparent; transition:color .25s, border-color .25s;
}
.rail-tab:hover{ color:var(--ink); }
.rail-tab[aria-pressed="true"]{ color:var(--gold); border-bottom-color:var(--gold); }

.rail{
  display:flex; gap:clamp(20px, 3vw, 40px);
  overflow-x:auto; scroll-snap-type:x proximity;
  padding-block:clamp(30px, 4vw, 44px) 10px;
  padding-inline:var(--pad-x);
  margin-inline:calc(-1 * var(--pad-x));
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.rail::-webkit-scrollbar{ display:none; }
.rail-card{
  flex:0 0 min(74vw, 380px);
  scroll-snap-align:start;
}
.rail-card[hidden]{ display:none; }
.rail-card .plate-img{ border:1px solid var(--line); }
.rail-card figcaption{ display:flex; gap:14px; align-items:baseline; margin-top:16px; }
.rail-card .roman-s{
  font-family:var(--font-display); font-size:20px; color:var(--gold); line-height:1;
}
.rail-card h3{ font-size:17.5px; letter-spacing:.05em; }
.rail-card .desc{ margin-top:6px; font-size:13.5px; color:var(--graphite); line-height:1.65; }
.rail-hint{
  margin-top:14px; font-family:var(--font-mono); font-size:11px;
  letter-spacing:.24em; color:var(--mist); text-transform:uppercase;
}

.diagram{ background:var(--bone); aspect-ratio:1/1; display:grid; place-items:center; }
.diagram svg{ width:78%; height:78%; }
.diagram [stroke]{ stroke:var(--gold); }
.diagram text{ fill:var(--gold); font-family:var(--font-mono); font-size:9.5px; letter-spacing:.28em; }


/* ---------- remote guarantee strip ---------- */

.remote-wrap{ padding-block:clamp(56px, 7vw, 96px); }
.remote-strip{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding-block:clamp(40px, 5vw, 60px);
}
.remote-grid{
  display:grid; grid-template-columns:repeat(4, 1fr);
  gap:clamp(24px, 3.5vw, 48px);
  margin-top:clamp(28px, 4vw, 40px);
}
.remote-item .mono{ color:var(--gold); display:block; margin-bottom:10px; }
.remote-item p{ font-size:14px; color:var(--graphite); line-height:1.7; }
@media (max-width: 900px){ .remote-grid{ grid-template-columns:repeat(2, 1fr); } }
@media (max-width: 560px){ .remote-grid{ grid-template-columns:1fr; } }




/* ---------- acceptance consent lines ---------- */

.check-line{
  display:flex; gap:12px; align-items:flex-start;
  font-size:13.5px; color:var(--graphite); line-height:1.65;
  margin-top:14px; cursor:pointer;
}
.check-line input{ margin-top:4px; accent-color:var(--gold); flex:none; }


.footer-legal a{ color:inherit; text-decoration:none; border-bottom:1px solid var(--graphite); transition:color .25s, border-color .25s; }
.footer-legal a:hover{ color:var(--gold); border-color:var(--gold); }


.terms-sec{ margin-bottom:clamp(36px, 5vw, 52px); }
.terms-sec h3{ font-size:clamp(19px, 2.4vw, 24px); letter-spacing:.04em; margin-bottom:14px; }
.terms-sec h3 .mono{ margin-right:10px; font-size:13px; }
.terms-sec p{ color:var(--graphite); line-height:1.85; max-width:72ch; }


/* protocol-preview link row — centred on its carbon ground */
.protocol-links{
  display:flex; flex-wrap:wrap; justify-content:center;
  gap:14px 28px; text-align:center;
}


/* consultation trust-strip — each item on one line, fluid to fit the column */
.trust-strip{
  display:flex; flex-direction:column; gap:2px;
  font-size:clamp(9px, 1.05vw, 11px);
  white-space:nowrap;
}
.trust-strip span{ display:block; }
@media (max-width: 900px){ .trust-strip{ font-size:11px; white-space:normal; } }