/* ============================================================
   SERAPHIN — design system (LIGHT)
   White ground, carbon ink, one signal red, engineering precision.
   No shadows. No gradients. No radius.

   Inverted from the original carbon build: the near-black that was
   the ground is now the ink, so the brand's core colour is retained
   as the thing you actually read.
   ============================================================ */

:root{
  --bg:#FFFFFF;         /* the ground */
  --surface:#F4F5F7;    /* raised / recessed sections */
  --surface-2:#EAECF0;  /* hover */
  --well:#F0F1F3;       /* image wells */
  --ink:#0B0C0E;        /* was the ground, now the ink */
  --muted:#6B7178;      /* 4.9:1 on white — above AA, verified */
  --line:#DEE1E6;       /* every rule */
  --red:#ED1C24;        /* the signal — fills only */
  --red-ink:#C41219;    /* text-safe red, 6.1:1 on white */
  --red-hi:#FF2F36;

  --display:"Archivo","Helvetica Neue",system-ui,sans-serif;
  --body:"Manrope","Helvetica Neue",system-ui,sans-serif;

  --wrap:1280px;
  --bleed:clamp(1.5rem,5vw,5rem);

  --s-eyebrow:.7rem;
  --s-small:.92rem;
  --s-body:1.0625rem;
  --s-lead:clamp(1.18rem,1.65vw,1.5rem);
  --s-h3:clamp(1.35rem,2.2vw,1.75rem);
  --s-h2:clamp(2.5rem,4.7vw,4.5rem);
  --s-h1:clamp(2.6rem,7vw,6.4rem);

  /* Calibrated to Apple's 144/216px section rhythm, then made distinctly
     Seraphin through wider editorial compositions and larger interior gaps.
     The previous 302px outer padding made small content islands feel stranded. */
  --gap-sm:24px;
  --gap-md:48px;
  --gap-lg:96px;
  --gap-xl:clamp(120px,12vw,176px);
  --gap-2xl:clamp(160px,16vw,232px);

  /* Header */
  --top-h:104px;
}

/* ---------- surface texture ----------
   HOOK: the carbon twill lived here. Neutralised pending the new
   background reference. Set --tex-image and --tex-opacity to bring a
   texture back — every .tex / .tex-weave surface reads from these two
   tokens, so it is a one-place change. */
:root{
  --tex-image:url("../img/carbon-weave2.webp");
  --tex-opacity:.05;
  --tex-size:cover;
}

*{box-sizing:border-box}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--body);
  font-size:var(--s-body);
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4{
  font-family:var(--display);
  font-weight:800;
  line-height:.98;
  letter-spacing:-.025em;
  margin:0;
}
h1{font-size:var(--s-h1);line-height:.95;letter-spacing:-.035em}
h2{font-size:var(--s-h2);text-wrap:balance}
h3{font-size:var(--s-h3);letter-spacing:-.015em}
p{margin:0;text-wrap:pretty}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

:focus-visible{outline:2px solid var(--red);outline-offset:3px}

.sr-skip{position:absolute;left:-9999px}
.sr-skip:focus{left:0;top:0;background:var(--red);color:#fff;padding:.85rem 1.4rem;z-index:200;font-weight:700}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--bleed)}

/* ---------- texture helpers ---------- */
.tex{position:relative;isolation:isolate}
.tex::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:var(--tex-image);
  background-size:var(--tex-size);
  opacity:var(--tex-opacity);
  pointer-events:none;
}
.tex-strong::before{opacity:calc(var(--tex-opacity) * 2)}

/* Panel that should read as a distinct material surface. */
.tex-weave{position:relative;isolation:isolate;background:var(--surface)}
.tex-weave::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:var(--tex-image);
  background-size:var(--tex-size);
  opacity:var(--tex-opacity);
}

/* ---------- type helpers ---------- */
.eyebrow{
  font-family:var(--display);
  font-size:var(--s-eyebrow);
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--red-ink);
  margin:0 0 2.25rem;
}
.eyebrow-muted{color:var(--muted)}
.lead{font-size:var(--s-lead);color:var(--muted);line-height:1.6;max-width:46ch}
.measure{max-width:52ch}
.muted{color:var(--muted)}

/* the signature: italic spec figure */
.fig{
  font-family:var(--display);
  font-weight:800;
  font-style:italic;
  letter-spacing:-.03em;
  line-height:1;
  display:block;
}
.fig .unit{
  font-family:var(--body);
  font-style:normal;
  font-weight:400;
  font-size:.34em;
  color:var(--muted);
  margin-left:.28rem;
  letter-spacing:0;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:60px;padding:0 2.35rem;
  font-family:var(--display);
  font-size:.78rem;font-weight:800;
  letter-spacing:.1em;text-transform:uppercase;
  border:1px solid transparent;border-radius:0;
  cursor:pointer;
  transition:background .18s ease,border-color .18s ease,color .18s ease;
}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-hi)}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-light{background:#F7F7F8;color:var(--ink);border-color:#F7F7F8}
.btn-light:hover{background:var(--red);border-color:var(--red);color:#fff}
.btn-sm{min-height:44px;padding:0 1.25rem;font-size:.72rem}

/* ---------- header ----------
   Homepage: 100% transparent and stuck to the top for the whole scroll —
   no glass, no fill, no texture, ever (user call, 2 Aug). The footage runs
   under it and the nav floats on top.
   Inner pages: NOT sticky (.s-static) — the bar scrolls away with the page
   and carries the solid carbon fill so the white nav stays legible. */
.s-top{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:transparent;
  border-bottom:1px solid transparent;
  isolation:isolate;
  transition:background .3s ease,border-color .3s ease;
}
body.admin-bar .s-top{ top:32px }
.s-top::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:var(--tex-image);
  background-size:cover;background-position:50% 32%;
  opacity:0;pointer-events:none;
  transition:opacity .3s ease;
}
/* Homepage: fully transparent at EVERY scroll depth. .is-scrolled is still
   set by chrome.js for other consumers, but it must not paint the bar. */
.s-top.is-scrolled{
  background:transparent;
  backdrop-filter:none;
  -webkit-backdrop-filter:none;
  border-bottom-color:transparent;
}
.s-top.is-scrolled::before{ opacity:0 }
/* Inner pages: static (scrolls away) + solid bar. */
.s-top.s-static{
  position:static;
  background:rgba(11,12,14,.94);
  border-bottom-color:rgba(242,243,244,.1);
}
.s-top.s-static::before{ opacity:.16 }
.s-top.s-solid{
  background:rgba(11,12,14,.88);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom-color:rgba(242,243,244,.1);
}
.s-top.s-solid::before{ opacity:.16 }
.s-top .wrap{
  display:flex;align-items:center;
  gap:clamp(2rem,5vw,5rem);
  min-height:var(--top-h);
}
.s-logo{display:flex;align-items:center;position:relative;z-index:1}
.s-logo-pair{position:relative;display:block;width:clamp(210px,20.2vw,291px);height:26px}
.s-logo-pair img{position:absolute;inset:0;width:100%;height:26px;object-fit:contain;object-position:left center;transition:opacity .35s ease}
.s-logo-ink{opacity:0}
.s-top.on-light .s-logo-reverse{opacity:0}
.s-top.on-light .s-logo-ink{opacity:1}
.s-nav{display:none;gap:clamp(2.15rem,3vw,3.25rem);margin-left:auto}
@media(min-width:980px){.s-nav{display:flex}}
.s-nav a{
  font-family:var(--display);
  font-size:.76rem;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;
  color:rgba(242,243,244,.78);
  padding:.7rem 0;border-bottom:2px solid transparent;
  transition:color .25s,border-color .15s;
}
.s-nav a:hover,.s-nav a[aria-current="page"]{color:#fff;border-bottom-color:var(--red)}
.s-top.on-light .s-nav a{color:rgba(11,12,14,.68)}
.s-top.on-light .s-nav a:hover,.s-top.on-light .s-nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--red)}

/* content clears the fixed bar — except cinematic-first pages, which run under it */
body:not(.home) #main{padding-top:0}
body.page-template-page-cinematic #main{ padding-top:0 }

/* mobile nav, no JS */
.s-mnav{position:relative;margin-left:auto}
@media(min-width:980px){.s-mnav{display:none}}
.s-mnav summary{
  list-style:none;cursor:pointer;
  display:inline-flex;align-items:center;gap:.6rem;
  min-height:48px;padding:.5rem 1.1rem;
  border:1px solid rgba(242,243,244,.3);
  color:#F2F3F4;
  font-family:var(--display);font-size:.72rem;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;
  user-select:none;
  transition:color .25s ease,border-color .25s ease;
}
.s-top.on-light .s-mnav summary{color:var(--ink);border-color:rgba(11,12,14,.28)}
.s-mnav summary::-webkit-details-marker{display:none}
.s-mnav[open] summary{border-color:#F2F3F4}
.s-mnav-ic{width:15px;height:11px;position:relative;display:inline-block}
.s-mnav-ic::before,.s-mnav-ic::after,.s-mnav-ic i{content:"";position:absolute;left:0;right:0;height:1.5px;background:currentColor}
.s-mnav-ic::before{top:0}.s-mnav-ic i{top:5px}.s-mnav-ic::after{bottom:0}
.s-mnav-panel{
  position:absolute;right:0;top:calc(100% + .7rem);min-width:240px;
  background:var(--bg);border:1px solid var(--line);z-index:60;
}
.s-mnav-panel a{display:block;padding:1.05rem 1.35rem;border-bottom:1px solid var(--line);font-size:.95rem}
.s-mnav-panel a:last-child{border-bottom:0}
.s-mnav-panel a:hover{background:var(--surface)}

/* ---------- sections ---------- */
.sec{padding:var(--gap-xl) 0}
.sec-air{padding:var(--gap-2xl) 0}
.sec-line{border-top:1px solid var(--line)}
.sec-surface{background:var(--surface)}
.head{max-width:56ch;margin-bottom:clamp(6rem,10vw,9rem)}
.head h2{margin-bottom:2.75rem}
.head p{color:var(--muted);font-size:var(--s-lead);line-height:1.65}

/* Wide editorial intro: label in the left rail, one strong thought on the
   right. This is the recurring composition that keeps sections open without
   leaving a tiny text island in the middle of an oversized field. */
.section-intro{
  display:grid;
  gap:clamp(2.5rem,6vw,6rem);
  margin-bottom:clamp(7rem,12vw,11rem);
  align-items:start;
}
.section-intro .eyebrow{margin:0;padding-top:.65rem}
.section-intro-main{max-width:760px}
.section-intro-main h2{max-width:13ch}
.section-intro-main p{
  max-width:46ch;
  margin-top:clamp(2.25rem,3.5vw,3.25rem);
  color:var(--muted);
  font-size:var(--s-lead);
  line-height:1.65;
}
@media(min-width:820px){
  .section-intro{grid-template-columns:minmax(150px,.42fr) minmax(0,1fr)}
}

/* ---------- spec strip ---------- */
.strip{background:var(--surface);border-block:1px solid var(--line);position:relative;isolation:isolate}
.strip::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:var(--tex-image);background-size:cover;
  opacity:.05;pointer-events:none;
}
.strip-grid{display:grid;grid-template-columns:repeat(2,1fr)}
@media(min-width:880px){.strip-grid{grid-template-columns:repeat(3,1fr)}}
.strip .cell{padding:clamp(3.25rem,5.5vw,5rem) clamp(2rem,3.4vw,3.25rem) clamp(3.25rem,5.5vw,5rem) 0;border-right:1px solid var(--line)}
.strip .cell:last-child{border-right:0}
@media(max-width:879px){
  .strip .cell:nth-child(2n){border-right:0}
  .strip .cell:nth-child(-n+2){border-bottom:1px solid var(--line)}
}
.strip .fig{font-size:clamp(2rem,3.8vw,3.1rem)}
.strip .cap{display:block;margin-top:1.15rem;font-size:var(--s-small);color:var(--muted);max-width:24ch;line-height:1.5}

/* ---------- range grid ---------- */
.range{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
@media(min-width:700px){.range{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1040px){.range{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--bg);padding:clamp(2.5rem,3.6vw,3.75rem);display:flex;flex-direction:column;transition:background .2s}
.card:hover{background:var(--surface)}
.card-img{
  aspect-ratio:5/4;
  background:var(--well);
  margin-bottom:2.4rem;overflow:hidden;
}
.card-img img{width:100%;height:100%;object-fit:cover}
.card h3{margin-bottom:.6rem}
.card .line{font-size:var(--s-small);color:var(--muted);margin-bottom:2rem}
.card dl{display:flex;gap:2.5rem;margin:0 0 2rem}
.card dt{font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:.35rem}
.card dd{margin:0;font-family:var(--display);font-weight:700;font-style:italic;font-size:1.22rem;letter-spacing:-.02em}
.card .price{margin-top:auto;font-family:var(--display);font-size:.82rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}

/* ---------- homepage product hand-off ----------
   One proposition, one price, and no catalogue grid immediately after the
   cinematic. Whitespace carries the premium tone; carbon returns with the
   product media rather than sitting behind this copy. */
.chair-intro{
  padding:var(--gap-2xl) 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:var(--bg);
}
.chair-intro-grid{
  display:grid;
  gap:clamp(5rem,10vw,10rem);
  align-items:end;
}
.chair-intro-copy h1{
  max-width:9ch;
  font-size:clamp(4rem,7.25vw,6.75rem);
  line-height:.91;
  letter-spacing:-.05em;
  text-wrap:balance;
}
.chair-intro-lead{
  max-width:31ch;
  margin-top:clamp(3rem,5vw,4.5rem);
  font-size:clamp(1.4rem,2.25vw,1.9rem);
  line-height:1.42;
  color:var(--muted);
}
.chair-intro-buy{
  min-height:390px;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  background:var(--surface);
  padding:clamp(3rem,5vw,5rem);
}
.chair-price-label{
  font-family:var(--display);
  font-size:var(--s-eyebrow);
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--muted);
}
.chair-price{
  margin-top:1rem;
  font-family:var(--display);
  font-size:clamp(2.65rem,4.2vw,4rem);
  font-weight:800;
  line-height:1;
  letter-spacing:-.035em;
}
.chair-intro-actions{display:grid;justify-items:start;gap:2rem;margin-top:clamp(3rem,5vw,4.5rem)}
.text-link{
  display:inline-block;
  padding-bottom:.25rem;
  border-bottom:1px solid var(--red);
  font-size:var(--s-small);
  font-weight:600;
}
@media(min-width:900px){
  .chair-intro-grid{grid-template-columns:minmax(0,1.28fr) minmax(360px,.72fr)}
}

/* ---------- buying promises ---------- */
.promises-grid{display:grid;gap:clamp(5rem,9vw,9rem)}
.promise{border-top:2px solid var(--ink);padding-top:clamp(2.75rem,4vw,4rem)}
.promise-index,.feat-index,.doc-index{
  font-family:var(--display);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
}
.promise h3{margin-top:clamp(3rem,5vw,4.5rem);font-size:clamp(2rem,3vw,2.75rem)}
.promise-copy{margin-top:2rem;max-width:38ch;font-size:var(--s-lead);line-height:1.65}
.promise-note{margin-top:2.5rem;max-width:48ch;color:var(--muted);font-size:.84rem;line-height:1.7}
@media(min-width:820px){.promises-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* ---------- benefit chapters ----------
   Apple-inspired product theatre, translated into Seraphin's square geometry:
   one idea per near-viewport scene, real product photography, and carbon used
   as the physical media surround rather than as wallpaper behind copy. */
.feat-sec{padding-top:var(--gap-2xl);border-top:1px solid var(--line)}
.feature-lede{
  display:grid;
  gap:clamp(3rem,7vw,7rem);
  align-items:start;
  margin-bottom:var(--gap-xl);
}
.feature-lede .eyebrow{margin:0;padding-top:.65rem}
.feature-lede-main{max-width:800px}
.feature-lede-main h2{max-width:11ch}
.feature-lede-main p{
  max-width:34ch;
  margin-top:clamp(2rem,3.4vw,3rem);
  color:var(--muted);
  font-size:var(--s-lead);
  line-height:1.58;
}
@media(min-width:820px){
  .feature-lede{grid-template-columns:minmax(150px,.42fr) minmax(0,1fr)}
}
.feat-rows{border-top:1px solid var(--line)}
.feat-box{
  margin:0;
  min-height:100svh;
  padding:var(--gap-xl) 0;
  border-bottom:1px solid var(--line);
  background:var(--bg);
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s ease,transform .7s ease;
}
.feat-box:nth-child(even){background:var(--surface)}
.feat-box.in{opacity:1;transform:none}
.feat-box-inner{
  display:grid;
  gap:clamp(4rem,8vw,8rem);
  align-items:center;
}
@media(min-width:900px){
  .feat-box-inner{grid-template-columns:minmax(0,7fr) minmax(330px,5fr)}
  .feat-box:nth-child(even) .feat-box-inner{grid-template-columns:minmax(330px,5fr) minmax(0,7fr)}
  .feat-box:nth-child(even) .feat-box-img{order:2}
}
.feat-box-img{position:relative;display:flex;align-items:center;justify-content:center;min-height:clamp(420px,48vw,680px);padding:0;overflow:visible;background:transparent}
.feat-scroll-video{position:relative;display:block;width:100%;height:auto;aspect-ratio:1/1;object-fit:contain;background:transparent;mix-blend-mode:multiply}
.feat-box figcaption{max-width:48ch;padding-block:clamp(1rem,3vw,3rem)}
.feat-index{display:block;margin-bottom:clamp(2.5rem,4vw,3.75rem)}
.feat-box .fig{
  display:block;
  font-family:var(--display);
  font-weight:800;
  font-style:italic;
  font-size:clamp(4rem,7vw,6.75rem);
  letter-spacing:-.05em;
  line-height:.88;
}
.feat-box .fig .unit{
  font-family:var(--body);
  font-weight:400;
  font-style:normal;
  font-size:.27em;
  color:var(--muted);
  margin-left:.4em;
  letter-spacing:0;
}
.feat-box .cap{
  display:block;
  margin-top:1.5rem;
  font-size:var(--s-small);
  color:var(--muted);
  line-height:1.6;
}
.feat-index + .cap{margin-top:0}
.feat-box h3{
  max-width:12ch;
  margin:clamp(2.25rem,4vw,3.5rem) 0 1.5rem;
  font-size:clamp(2.3rem,4.3vw,4.1rem);
  line-height:.98;
  letter-spacing:-.035em;
}
.feat-box-line{max-width:38ch;color:var(--muted);font-size:var(--s-lead);line-height:1.62;margin:0}
@media(prefers-reduced-motion:reduce){
  .feat-box{opacity:1;transform:none}
  .feat-scroll-video{transform:none!important}
}

/* ---------- travel proof ----------
   Carbon is richest here and in the footer. The content sits on a nearly
   opaque ink field, keeping the material visible around—not through—copy. */
.docs-sec{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  padding:var(--gap-2xl) 0;
  background:var(--ink);
  color:#F2F3F4;
}
.docs-sec::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background-image:var(--tex-image);
  background-size:cover;
  background-position:50% 58%;
  opacity:.28;
  filter:brightness(.66) contrast(1.1);
}
.docs-shell{
  background:rgba(11,12,14,.94);
  border:1px solid rgba(242,243,244,.15);
  padding:clamp(5rem,8vw,8rem) clamp(1.5rem,6vw,6rem);
}
.docs-intro{
  display:grid;
  gap:clamp(3rem,7vw,7rem);
  align-items:start;
  margin-bottom:clamp(5rem,9vw,8rem);
}
.docs-intro .eyebrow{margin:0;padding-top:.65rem;color:var(--red-hi)}
.docs-intro-main{max-width:820px}
.docs-intro-main h2{max-width:12ch;color:#F2F3F4}
.docs-intro-main p{
  max-width:42ch;
  margin-top:clamp(2rem,3.4vw,3rem);
  color:rgba(242,243,244,.7);
  font-size:var(--s-lead);
  line-height:1.6;
}
@media(min-width:820px){
  .docs-intro{grid-template-columns:minmax(150px,.42fr) minmax(0,1fr)}
}
.docs-list{list-style:none;padding:0;margin:0;border-top:1px solid rgba(242,243,244,.34)}
.docs-list li{
  display:grid;
  gap:1.25rem;
  padding:clamp(2.25rem,3.5vw,3.25rem) 0;
  border-bottom:1px solid rgba(242,243,244,.16);
}
.docs-list h3{font-size:clamp(1.4rem,2.1vw,1.85rem);color:#F2F3F4}
.docs-list p{max-width:38ch;color:rgba(242,243,244,.62);font-size:var(--s-small);line-height:1.7}
.docs-list .doc-index{color:rgba(242,243,244,.45)}
.docs-action{margin-top:clamp(4rem,7vw,6.5rem)}
@media(min-width:900px){
  .docs-list li{grid-template-columns:64px minmax(220px,.8fr) minmax(0,1.2fr);align-items:start;gap:clamp(2rem,5vw,5rem)}
}

/* ---------- footer: the richest carbon surface ---------- */
.s-foot{
  border-top:0;
  padding:clamp(9rem,15vw,14rem) 0 var(--gap-md);
  font-size:var(--s-small);
  position:relative;
  isolation:isolate;
  overflow:hidden;
  background:var(--ink);
  color:#F2F3F4;
}
.s-foot::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:var(--tex-image);
  background-size:cover;background-position:50% 58%;
  opacity:.32;filter:brightness(.68) contrast(1.08);pointer-events:none;
}
.s-foot .wrap{position:relative;z-index:1}
.s-foot-head{max-width:980px;margin-bottom:clamp(8rem,14vw,13rem)}
.s-foot-tagline{
  margin-top:0;
  max-width:7ch;
  font-family:var(--display);
  font-weight:800;
  font-size:clamp(4rem,9vw,9rem);
  line-height:.88;
  letter-spacing:-.055em;
  color:#F2F3F4;
}
.s-foot-tagline em{font-style:normal;color:var(--red-hi)}
.s-foot-summary{margin-top:clamp(3rem,5vw,4rem);max-width:34ch;color:rgba(242,243,244,.68);font-size:var(--s-lead);line-height:1.55}
.s-fgrid{
  display:grid;
  gap:clamp(3.5rem,7vw,7rem);
  max-width:880px;
  margin:0 0 clamp(7rem,11vw,10rem) auto;
  padding-top:clamp(3rem,5vw,4.5rem);
  border-top:1px solid rgba(242,243,244,.22);
}
@media(min-width:700px){.s-fgrid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.s-foot h4{font-family:var(--display);font-size:.7rem;font-weight:700;letter-spacing:.17em;text-transform:uppercase;color:rgba(242,243,244,.5);margin:0 0 2rem}
.s-foot ul{list-style:none;padding:0;margin:0;display:grid;gap:1.15rem}
.s-foot a{color:rgba(242,243,244,.72);transition:color .18s ease}
.s-foot a:hover{color:#fff}
.s-fbase{border-top:1px solid rgba(242,243,244,.18);padding-top:3rem;color:rgba(242,243,244,.55);font-size:.8rem;display:flex;flex-wrap:wrap;gap:1.5rem;justify-content:space-between}

/* ---------- responsive rhythm ---------- */
@media(max-width:899px){
  .chair-intro-buy{min-height:0}
  .feat-box{min-height:0;padding:clamp(6rem,15vw,8rem) 0}
  .feat-box-inner{gap:clamp(3rem,8vw,5rem)}
  .feat-box-img{min-height:0;padding:0}
  .feat-box figcaption{padding-block:0}
}
@media(max-width:640px){
  :root{
    --bleed:1.5rem;
    --gap-xl:clamp(96px,28vw,120px);
    --gap-2xl:clamp(120px,34vw,152px);
    --top-h:84px;
  }
  .s-top .wrap{gap:1rem}
  .s-logo-pair{width:170px;height:18px}
  .s-logo-pair img{height:18px}
  .s-mnav summary{padding:.45rem .8rem;font-size:.66rem}
  .section-intro{margin-bottom:clamp(5.5rem,22vw,7rem)}
  .section-intro-main p{font-size:1.08rem}
  .chair-intro-copy h1{font-size:clamp(3.35rem,16vw,4.6rem)}
  .chair-intro-buy{padding:3.25rem 2rem}
  .chair-intro-actions .btn{width:100%;padding-inline:1.25rem}
  .promise h3{margin-top:2.75rem}
  .feature-lede{margin-bottom:clamp(5.5rem,22vw,7rem)}
  .docs-shell{padding:4.75rem 1.5rem}
  .s-foot{padding-top:8rem}
  .s-foot-tagline{font-size:clamp(4rem,20vw,5.5rem)}
  .s-foot-head{margin-bottom:7rem}
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
}


/* ---------- design details band (v192) ----------
   Three short real-photograph loops, borderless, multiply-blended onto the
   ground so the media meets the page with no frame. */
.detail-sec{padding:var(--gap-2xl) 0;border-top:1px solid var(--line)}
.detail-lede{margin-bottom:var(--gap-lg)}
.detail-lede h2{max-width:14ch}
.detail-lede p{max-width:44ch;color:var(--muted);font-size:var(--s-lead);line-height:1.6;margin-top:1.25rem}
.detail-grid{display:grid;gap:1px;background:var(--line);border-block:1px solid var(--line)}
@media (min-width:880px){.detail-grid{grid-template-columns:repeat(3,1fr)}}
.detail-cell{margin:0;background:var(--bg);padding:clamp(1.5rem,3vw,2.5rem) clamp(1.25rem,2.4vw,2rem)}
.detail-cell video{display:block;width:100%;height:auto;aspect-ratio:1/1;object-fit:contain;background:transparent;mix-blend-mode:multiply}
.detail-cell figcaption{margin-top:1.25rem}
.detail-cell h3{font-size:1.05rem;letter-spacing:-.01em;margin:0 0 .5rem}
.detail-cell p{margin:0;color:var(--muted);font-size:var(--s-small);line-height:1.6;max-width:34ch}