/* ============================================================
   SHAWN DU — PROJECT DETAIL SHEETS (shared stylesheet)
   Same design system as index.html: living technical drawing.
   Day = vellum drafting paper · Night = tungsten workshop.
   改这里 = 13 个详情页一起变。
   ============================================================ */

:root{
  --paper:#F0EFEA;
  --paper-2:#E7E5DE;
  --ink:#17191C;
  --ink-soft:#45484D;
  --line:#C1BFB6;
  --line-soft:#D6D3CB;
  --accent:#2D4C8F;
  --glow:#D88B12;
  --card:#F5F3ED;
  --shadow:rgba(27,30,34,.12);
  --grid-line:rgba(45,76,143,.045);
}
html[data-theme="night"]{
  --paper:#11110E;
  --paper-2:#171612;
  --ink:#F0ECE2;
  --ink-soft:#A7A293;
  --line:#37352E;
  --line-soft:#282720;
  --accent:#E3A23A;
  --glow:#FFC56B;
  --card:#181713;
  --shadow:rgba(0,0,0,.5);
  --grid-line:rgba(227,162,58,.035);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Instrument Sans',system-ui,sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.6;
  overflow-x:hidden;
  transition:background .6s ease,color .6s ease;
  background-image:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:64px 64px;
}
.skip-link{position:fixed;left:16px;top:12px;z-index:10000;padding:10px 14px;background:var(--accent);color:#0c0b08;font:500 11px/1 "IBM Plex Mono",monospace;letter-spacing:.08em;transform:translateY(-160%);transition:transform .18s ease}
.skip-link:focus{transform:translateY(0);outline:2px solid var(--ink);outline-offset:3px}
::selection{background:var(--accent);color:var(--paper)}

.zh{font-family:'Noto Serif SC',serif}
.mono{font-family:'IBM Plex Mono',monospace}

/* ---------- CAD cursor ---------- */
@media (hover:hover) and (pointer:fine){
  body{cursor:none}
  a,button{cursor:none}
}
.xhair{position:fixed;pointer-events:none;z-index:9999;mix-blend-mode:difference;opacity:0;transition:opacity .3s}
body.cursor-on .xhair{opacity:1}
.xhair-h{left:0;right:0;height:1px;background:#8f9dc9}
.xhair-v{top:0;bottom:0;width:1px;background:#8f9dc9}
.xhair-dot{width:9px;height:9px;border:1px solid #cfd8f5;transform:translate(-50%,-50%);transition:width .18s,height .18s,border-radius .18s,background .18s}
body.cursor-hover .xhair-dot{width:34px;height:34px;border-radius:50%;background:rgba(207,216,245,.15)}
.coords{
  position:fixed;right:20px;bottom:16px;z-index:9998;
  font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.08em;
  color:var(--ink-soft);opacity:0;transition:opacity .4s;pointer-events:none;
}
body.cursor-on .coords{opacity:.85}
@media (hover:none),(pointer:coarse){.xhair,.coords{display:none}}

/* ---------- Drawing frame ---------- */
.sheet-frame{position:fixed;inset:10px;border:1px solid var(--line);pointer-events:none;z-index:50;transition:border-color .6s}
.sheet-frame::after{content:"";position:absolute;inset:5px;border:1px solid var(--line-soft);transition:border-color .6s}
.frame-tick{position:fixed;font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.14em;color:var(--accent);background:var(--paper);padding:0 10px;z-index:51;pointer-events:none;transition:color .6s,background .6s}
.frame-tick.t1{top:14px;left:50%;transform:translateX(-50%)}
.frame-tick.t2{bottom:14px;left:24px}
@media(max-width:720px){.sheet-frame{inset:6px}.sheet-frame::after{inset:3px}.frame-tick.t2{display:none}}

/* ---------- Nav ---------- */
nav.top{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:22px clamp(24px,4vw,56px);
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;
  background:linear-gradient(var(--paper),transparent);
  transition:background .6s,transform .55s cubic-bezier(.22,1,.36,1),opacity .35s,border-color .4s;
}
nav.top.nav-hidden{transform:translateY(calc(-100% - 32px));opacity:0;pointer-events:none}
nav.top.scrolled{
  background:color-mix(in srgb,var(--paper) 82%,transparent);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid color-mix(in srgb,var(--line) 55%,transparent);
}
nav.top .brand{font-size:14px;letter-spacing:.075em;font-weight:500;color:var(--ink);text-decoration:none}
nav.top .brand span{color:var(--accent)}
.nav-links{display:flex;gap:clamp(14px,2.5vw,34px);align-items:center}
.nav-links a{color:var(--ink-soft);text-decoration:none;position:relative;padding:4px 0;transition:color .25s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--accent);transition:width .3s}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{width:100%}
.nav-links a:focus-visible,button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- Lamp pull-cord toggle ---------- */
.lamp-toggle{
  background:none;border:none;padding:0;position:relative;top:-26px;
  width:60px;height:112px;display:flex;flex-direction:column;align-items:center;
}
.cord-wrap{
  display:flex;flex-direction:column;align-items:center;
  transform-origin:top center;animation:sway 5.5s ease-in-out infinite;
}
@keyframes sway{0%,100%{transform:rotate(0deg)}25%{transform:rotate(4deg)}75%{transform:rotate(-4deg)}}
.lamp-toggle:hover .cord-wrap{animation-play-state:paused}
.lamp-toggle .cord{width:1.5px;height:46px;background:var(--ink-soft);transition:height .2s cubic-bezier(.34,1.56,.64,1)}
.lamp-toggle:hover .cord{height:56px}
.lamp-toggle.dragging .cord{transition:none}
.bulb{width:40px;height:40px;display:block;position:relative}
.bulb svg{
  width:100%;height:100%;stroke:var(--ink);fill:none;
  stroke-width:1.5;stroke-linecap:round;
  transition:stroke .4s,fill .4s,filter .4s;
}
.bulb .rays{opacity:0;transition:opacity .4s}
html[data-theme="night"] .bulb svg{
  stroke:var(--glow);fill:rgba(255,184,77,.16);
  filter:drop-shadow(0 0 10px var(--glow)) drop-shadow(0 0 26px rgba(255,184,77,.5));
}
html[data-theme="night"] .bulb .rays{opacity:1}
.light-flash{
  position:fixed;inset:0;pointer-events:none;z-index:9000;opacity:0;
  background:radial-gradient(circle at var(--fx,92%) var(--fy,4%),var(--glow) 0%,rgba(255,184,77,.35) 30%,transparent 62%);
}
.light-flash.go{animation:flashOut .9s cubic-bezier(.16,1,.3,1)}
@keyframes flashOut{0%{opacity:.9}100%{opacity:0}}

/* ---------- Project hero ---------- */
.p-hero{
  padding:clamp(140px,22vh,190px) clamp(24px,6vw,80px) 30px;
  position:relative;
}
.p-eyebrow{
  font-family:'IBM Plex Mono',monospace;font-size:clamp(10px,1.2vw,12px);
  letter-spacing:.22em;color:var(--accent);margin-bottom:20px;
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
}
.p-eyebrow::before{content:"";width:44px;height:1px;background:var(--accent)}
.p-title{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 114;
  font-weight:800;
  font-size:clamp(40px,8.5vw,124px);
  line-height:.95;letter-spacing:-.02em;text-transform:uppercase;
  max-width:14ch;
}
.p-sub{margin-top:20px;font-size:clamp(15px,1.8vw,19px);color:var(--ink-soft);max-width:58ch}

/* horizontal title-block strip under the hero */
.p-meta{
  margin:34px 0 0;border:1px solid var(--line);background:var(--card);
  display:grid;grid-template-columns:repeat(5,1fr);
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.05em;
  transition:background .6s,border-color .6s;
}
.p-meta .cell{padding:12px 14px;border-right:1px solid var(--line-soft)}
.p-meta .cell:last-child{border-right:none}
.p-meta .lbl{display:block;font-size:8px;color:var(--accent);letter-spacing:.16em;margin-bottom:3px}
.p-meta .val{color:var(--ink)}
@media(max-width:820px){
  .p-meta{grid-template-columns:1fr 1fr}
  .p-meta .cell:nth-child(2n){border-right:none}
  .p-meta .cell{border-bottom:1px solid var(--line-soft)}
  .p-meta .cell:nth-last-child(1),.p-meta .cell:nth-last-child(2):nth-child(odd)~.cell{border-bottom:none}
}

/* ---------- Section scaffolding ---------- */
section.sheet{padding:clamp(60px,9vh,110px) clamp(24px,6vw,80px);position:relative;scroll-margin-top:88px}
.sec-head{display:flex;align-items:baseline;gap:20px;margin-bottom:clamp(32px,5vh,54px);flex-wrap:wrap}
.sec-num{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--accent);letter-spacing:.1em;border:1px solid var(--accent);padding:3px 8px}
.sec-title{
  font-family:'Archivo',sans-serif;font-variation-settings:'wdth' 112;font-weight:750;
  font-size:clamp(26px,4.2vw,44px);text-transform:uppercase;letter-spacing:-.01em;line-height:1;
}
.sec-title .zh{font-size:.5em;color:var(--accent);font-weight:700;margin-left:14px;letter-spacing:.2em;vertical-align:.22em}
.sec-rule{flex:1 1 60px;height:1px;background:var(--line);align-self:center;min-width:40px}

.rv{opacity:0;transform:translateY(28px);transition:opacity .8s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}
.rv.in{opacity:1;transform:none}

/* body copy */
.copy{max-width:68ch;color:var(--ink-soft);font-size:16px}
.copy p+p{margin-top:14px}
.copy em{font-style:normal;color:var(--accent)}

/* placeholder for copy Shawn will paste */
.ph-copy{
  border:1px dashed var(--line);background:var(--card);
  font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:.12em;
  color:var(--ink-soft);line-height:2.1;text-align:center;
  padding:clamp(26px,4vw,44px);max-width:900px;
  transition:background .6s,border-color .6s;
}
.ph-copy b{color:var(--accent);font-weight:500}

/* ---------- Figure slots ---------- */
.fig-grid{display:grid;gap:clamp(18px,2.6vw,32px);margin-top:clamp(24px,4vh,40px)}
.fig-grid.two{grid-template-columns:1fr 1fr}
@media(max-width:720px){.fig-grid.two{grid-template-columns:1fr}}
.fig{
  position:relative;overflow:hidden;border:1px solid var(--line);
  background:
    repeating-linear-gradient(45deg,transparent,transparent 7px,var(--grid-line) 7px,var(--grid-line) 8px),
    var(--paper-2);
  display:flex;align-items:center;justify-content:center;
  transition:background .6s,border-color .6s;
}
.fig.r-land{aspect-ratio:16/9}
.fig.r-land32{aspect-ratio:3/2}
.fig.r-land43{aspect-ratio:4/3}
.fig.r-port{aspect-ratio:3/4}
.fig.r-port23{aspect-ratio:2/3}
.fig.r-port45{aspect-ratio:4/5}
.fig.r-phone{aspect-ratio:9/16}
.fig.r-sq{aspect-ratio:1/1}
.fig picture{display:block;width:100%;height:100%}
.fig img{width:100%;height:100%;object-fit:cover;display:block}
.fig video{width:100%;height:100%;object-fit:cover;display:block;background:var(--paper)}
.fig-tag{
  position:absolute;top:10px;left:10px;z-index:2;
  font-family:'IBM Plex Mono',monospace;font-size:9px;letter-spacing:.14em;
  background:var(--paper);border:1px solid var(--line);padding:3px 7px;color:var(--ink-soft);
}
.fig-ph{
  font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.14em;color:var(--ink-soft);
  border:1px dashed var(--line);padding:10px 16px;text-align:center;line-height:1.8;
}
.fig-cap{
  font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.1em;
  color:var(--ink-soft);margin-top:8px;
}
.fig-cap b{color:var(--accent);font-weight:500}

/* ---------- Prev / Index / Next pager ---------- */
.pager{
  margin:clamp(30px,6vh,60px) clamp(24px,6vw,80px) 26px;
  border:1px solid var(--line);
  display:grid;grid-template-columns:1fr auto 1fr;
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;
}
.pager a{
  padding:18px 20px;color:var(--ink);text-decoration:none;
  display:flex;flex-direction:column;gap:5px;transition:background .25s;
  justify-content:center;
}
.pager a:hover{background:var(--card)}
.pager .lbl{font-size:8px;color:var(--accent);letter-spacing:.18em}
.pager .mid{border-left:1px solid var(--line-soft);border-right:1px solid var(--line-soft);align-items:center;text-align:center}
.pager .next{align-items:flex-end;text-align:right}
@media(max-width:640px){
  .pager{grid-template-columns:1fr 1fr}
  .pager .mid{grid-column:1 / -1;grid-row:2;border:none;border-top:1px solid var(--line-soft);align-items:center}
}

/* ---------- Footer rev table ---------- */
footer{
  margin:0 clamp(24px,6vw,80px) 40px;border:1px solid var(--line);
  font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.08em;color:var(--ink-soft);
  display:grid;grid-template-columns:repeat(4,1fr);
}
footer .f-cell{padding:12px 16px;border-right:1px solid var(--line-soft)}
footer .f-cell:last-child{border-right:none}
footer .f-cell .lbl{display:block;font-size:8px;letter-spacing:.16em;margin-bottom:3px;color:var(--accent)}
@media(max-width:720px){footer{grid-template-columns:1fr 1fr}footer .f-cell:nth-child(2){border-right:none}}

/* ---------- v2: SHT plate · lamp physics · CAD toys ---------- */
.frame-tick{z-index:130;white-space:nowrap}
.lamp-toggle{touch-action:none}
.frame-tick.t1{background:var(--accent);color:var(--paper);padding:4px 16px;font-size:11px;font-weight:500;letter-spacing:.16em}
.bulb::after{content:"";position:absolute;inset:-10px;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(232,148,10,.3),transparent 70%);
  animation:haloPulse 2.8s ease-in-out infinite}
@keyframes haloPulse{0%,100%{opacity:.2;transform:scale(1)}50%{opacity:.8;transform:scale(1.3)}}
.bulb.flick svg{animation:bulbFlick .6s steps(2,end)}
@keyframes bulbFlick{0%{opacity:1}20%{opacity:.25}35%{opacity:1}55%{opacity:.3}70%{opacity:1}85%{opacity:.5}100%{opacity:1}}
.cadpt{position:fixed;z-index:9997;pointer-events:none;text-align:center;transform:translate(-50%,-50%);
  font-family:'IBM Plex Mono',monospace;font-size:9px;color:var(--accent);letter-spacing:.08em;
  animation:cadFade 1.6s ease forwards}
.cadpt::before{content:"+";display:block;font-size:15px;line-height:1;margin-bottom:2px}
@keyframes cadFade{0%,60%{opacity:1}100%{opacity:0}}
.ruler{position:fixed;left:24px;top:50%;transform:translateY(-50%);height:min(50vh,420px);width:9px;z-index:52;pointer-events:none}
.ruler::before{content:"";position:absolute;right:0;top:0;bottom:0;width:1px;background:var(--line)}
.ruler::after{content:"";position:absolute;right:1px;top:0;bottom:0;width:6px;
  background:repeating-linear-gradient(to bottom,var(--line) 0,var(--line) 1px,transparent 1px,transparent 10.5%)}
.ruler .rmark{position:absolute;left:-4px;right:-2px;height:2px;background:var(--accent);top:0}
.ruler .rlabel{position:absolute;left:14px;top:0;transform:translateY(-50%);white-space:nowrap;
  font-family:'IBM Plex Mono',monospace;font-size:9px;color:var(--accent);letter-spacing:.08em}
@media(max-width:900px){.ruler{display:none}}
.p-title .ch{font-style:normal;display:inline-block}
.p-title .word{display:inline-block;white-space:nowrap}

/* ---------- v3: case-study reading rail ---------- */
.case-nav{
  position:fixed;right:22px;top:50%;transform:translateY(-50%);z-index:55;
  display:flex;flex-direction:column;border:1px solid var(--line);
  background:color-mix(in srgb,var(--paper) 76%,transparent);
  -webkit-backdrop-filter:blur(14px) saturate(135%);backdrop-filter:blur(14px) saturate(135%);
  font-family:'IBM Plex Mono',monospace;
}
.case-nav a{position:relative;width:42px;height:42px;display:grid;place-items:center;color:var(--ink-soft);text-decoration:none;
  font-size:9px;letter-spacing:.08em;border-bottom:1px solid var(--line-soft);transition:color .25s,background .25s}
.case-nav a:last-child{border-bottom:none}
.case-nav a::before{content:"";position:absolute;left:-1px;top:7px;bottom:7px;width:2px;background:var(--accent);transform:scaleY(0);transition:transform .25s}
.case-nav a.active{color:var(--accent);background:var(--card)}
.case-nav a.active::before{transform:scaleY(1)}
.case-nav .tip{position:absolute;right:calc(100% + 10px);padding:5px 8px;border:1px solid var(--line);background:var(--paper);color:var(--ink);
  white-space:nowrap;opacity:0;transform:translateX(5px);pointer-events:none;transition:opacity .2s,transform .2s;font-size:8px;letter-spacing:.12em}
.case-nav a:hover .tip{opacity:1;transform:none}
@media(max-width:1040px){.case-nav{display:none}}
@media(max-width:720px){
  nav.top{padding:18px 23px}
  nav.top .brand{font-size:12.5px}
  .nav-links{gap:8px}
  .nav-links>a{font-size:0;letter-spacing:.12em;white-space:nowrap}
  .nav-links>a::before{content:"← INDEX";font-size:9px}
  .p-hero{padding-top:132px}
  .p-title{font-size:clamp(42px,13vw,58px);line-height:.98}
  .p-sub{line-height:1.55}
}

/* ---------- v4: precision editorial refinement ---------- */
.xhair-h,.xhair-v,.coords{display:none!important}
.xhair-dot{width:14px;height:14px;border:1px solid var(--accent);border-radius:50%;mix-blend-mode:normal;
  background:color-mix(in srgb,var(--paper) 26%,transparent);box-shadow:0 0 0 1px color-mix(in srgb,var(--paper) 28%,transparent);
  transition:width .28s cubic-bezier(.22,1,.36,1),height .28s cubic-bezier(.22,1,.36,1),background .25s,border-color .25s}
.xhair-dot::before{content:"";position:absolute;left:50%;top:50%;width:3px;height:3px;border-radius:50%;background:var(--accent);transform:translate(-50%,-50%)}
.xhair-dot::after{content:attr(data-label);position:absolute;inset:0;display:grid;place-items:center;color:var(--ink);font-family:'IBM Plex Mono',monospace;font-size:7px;letter-spacing:.12em;opacity:0;transition:opacity .18s}
body.cursor-hover .xhair-dot{width:48px;height:48px;border-color:color-mix(in srgb,var(--accent) 72%,transparent);background:color-mix(in srgb,var(--paper) 88%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
body.cursor-hover .xhair-dot::before{opacity:0}
body.cursor-hover .xhair-dot::after{opacity:1}
.ruler{display:none!important}
.p-hero{padding-top:clamp(140px,19vh,174px);padding-bottom:34px}
.p-title{font-weight:500;font-variation-settings:'wdth' 100;font-size:clamp(42px,7.2vw,98px);line-height:.94;letter-spacing:-.04em;max-width:16ch}
.p-title--long{font-size:clamp(40px,6.6vw,88px);max-width:18ch}
.p-title--wide{font-size:clamp(38px,5.8vw,78px);max-width:22ch}
.p-title--longword{font-size:clamp(34px,5vw,70px);max-width:24ch}
.p-sub{margin-top:18px;font-size:clamp(15px,1.5vw,18px)}
.p-meta{margin-top:30px}
.sec-title{font-weight:500;font-variation-settings:'wdth' 99;font-size:clamp(26px,3.5vw,40px);letter-spacing:-.025em}
.sec-title .zh{font-weight:500}
section.sheet{padding-top:clamp(72px,8vh,96px);padding-bottom:clamp(72px,8vh,96px)}
.rv{transform:translateY(16px);transition-duration:.7s}
.case-nav{background:color-mix(in srgb,var(--paper) 84%,transparent)}
@media(max-width:720px){.p-title{font-size:clamp(38px,11.8vw,52px)}.p-title--longword{font-size:clamp(30px,9.2vw,40px)}.p-hero{padding-top:126px}}

/* ---------- v5: completed case-study editorial system ---------- */
.p-meta.six{grid-template-columns:repeat(6,1fr)}
.hero-sheet{padding-bottom:clamp(76px,10vh,124px)!important}
.photo-native img{object-fit:contain}
.photo-native video{object-fit:contain}
.portrait-feature{width:min(100%,680px,58.5vh);margin-inline:auto}
.portrait-feature--detail{width:min(100%,580px,54vh)}
.case-hero .fig{background:#171612}
.opening-sheet{padding-top:clamp(38px,5vh,58px)!important;padding-bottom:clamp(76px,9vh,110px)!important}
.opening-grid{display:grid;grid-template-columns:minmax(360px,.9fr) minmax(0,1.1fr);gap:clamp(42px,6vw,88px);align-items:center;max-width:1180px;margin-inline:auto}
.opening-visual{width:100%;max-width:520px;margin:0}
.opening-visual--tall{width:min(100%,460px,50vh)}
.opening-grid--landscape{grid-template-columns:minmax(460px,1.08fr) minmax(0,.92fr);max-width:1260px}
.opening-visual--wide{max-width:650px}
.opening-brief{min-width:0}
.opening-brief .sec-head{margin-bottom:clamp(28px,4vh,42px)}
.opening-brief .case-lead{max-width:560px}
.opening-brief .case-lead p{font-size:clamp(25px,2.7vw,38px)}
.opening-brief .copy{font-size:clamp(15px,1.2vw,17px);line-height:1.65;margin-top:clamp(24px,4vh,38px);max-width:58ch}
.opening-spec{grid-template-columns:1fr 1fr;margin-top:clamp(30px,5vh,48px)}
.opening-spec div:nth-child(2){border-right:0}
.opening-spec div:nth-child(-n+2){border-bottom:1px solid var(--line-soft)}
.case-intro{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(280px,.92fr);gap:clamp(34px,7vw,110px);align-items:start}
.case-intro.compact{margin-bottom:clamp(30px,5vh,58px)}
.case-lead{max-width:620px}
.case-kicker{display:block;font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.18em;color:var(--accent);margin-bottom:14px}
.case-lead p{font-family:'Archivo',sans-serif;font-variation-settings:'wdth' 99;font-size:clamp(25px,3vw,42px);font-weight:500;line-height:1.12;letter-spacing:-.025em}
.case-intro .copy{font-size:clamp(15px,1.25vw,18px);line-height:1.68;padding-top:24px}
.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);margin-top:clamp(38px,6vh,68px);border:1px solid var(--line);background:var(--card)}
.spec-grid div{padding:16px clamp(14px,2vw,24px);border-right:1px solid var(--line-soft)}
.spec-grid div:last-child{border-right:0}
.spec-grid span,.spec-grid b{display:block;font-family:'IBM Plex Mono',monospace}
.spec-grid span{font-size:8px;letter-spacing:.17em;color:var(--accent);margin-bottom:6px}
.spec-grid b{font-size:10px;line-height:1.55;letter-spacing:.06em;font-weight:500}
.research-plate{width:min(100%,820px);margin-inline:auto}
.research-plate .fig img{object-position:center 43%}
.media-grid--mixed{grid-template-columns:minmax(0,1.3fr) minmax(240px,.7fr);align-items:end;max-width:1120px;margin-inline:auto}
.mechanism-grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.portrait-trio{grid-template-columns:repeat(3,minmax(0,1fr));max-width:1120px;margin-inline:auto}
.light-state-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,2.6vw,32px)}
.portrait-pair{max-width:900px;margin-inline:auto}
.portrait-pair--tall{max-width:800px}
.evidence-grid{display:grid;grid-template-columns:minmax(250px,.72fr) minmax(0,1.28fr);gap:clamp(42px,7vw,104px);align-items:center;max-width:1100px;margin-inline:auto}
.evidence-copy{min-width:0}
.evidence-copy .case-lead p{font-size:clamp(25px,3vw,40px)}
.evidence-copy .copy{font-size:clamp(15px,1.2vw,18px);line-height:1.68;margin-top:clamp(24px,4vh,38px)}
.evidence-figure--reference{width:min(100%,320px,36vh);justify-self:center}
.translation-rail{display:grid;grid-template-columns:repeat(3,1fr);margin-top:clamp(30px,5vh,48px);border:1px solid var(--line);background:var(--card)}
.translation-rail div{padding:15px 14px;border-right:1px solid var(--line-soft)}
.translation-rail div:last-child{border-right:0}
.translation-rail span,.translation-rail b{display:block;font-family:'IBM Plex Mono',monospace}
.translation-rail span{font-size:8px;letter-spacing:.14em;color:var(--accent);margin-bottom:7px}
.translation-rail b{font-size:9px;line-height:1.5;letter-spacing:.06em;font-weight:500}
.mechanism-evidence{grid-template-columns:minmax(0,1.12fr) minmax(300px,.88fr)}
.evidence-figure--mechanism{width:min(100%,430px,45vh);justify-self:center}
.mechanism-spec{grid-template-columns:1fr 1fr;margin-top:clamp(30px,5vh,48px)}
.mechanism-spec div:nth-child(2){border-right:0}
.mechanism-spec div:nth-child(-n+2){border-bottom:1px solid var(--line-soft)}
.sport-mode-head{display:flex;align-items:center;gap:14px;margin:clamp(48px,7vh,76px) 0 clamp(24px,4vh,38px);font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.18em;color:var(--accent)}
.sport-mode-head::after{content:"";height:1px;flex:1;background:var(--line)}
.state-matrix{max-width:980px;margin-inline:auto;gap:clamp(26px,3vw,40px)}
.sport-mixed{display:grid;grid-template-columns:minmax(240px,.72fr) minmax(0,1.28fr);gap:clamp(24px,4vw,52px);align-items:end;max-width:1040px;margin-inline:auto}
.wide-evidence{width:min(100%,820px);margin-inline:auto}
.research-slide-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,2.6vw,32px);max-width:1040px;margin-inline:auto}
.system-logic{display:grid;grid-template-columns:minmax(220px,.6fr) minmax(0,1.4fr);gap:clamp(42px,7vw,100px);align-items:center;max-width:1040px;margin-inline:auto}
.system-logic .dashboard-figure{width:min(100%,300px);justify-self:center}
.device-block{padding-top:clamp(46px,7vh,78px);margin-top:clamp(46px,7vh,78px);border-top:1px solid var(--line)}
.device-block:first-of-type{margin-top:0}
.device-head{display:grid;grid-template-columns:minmax(180px,.55fr) minmax(0,1.45fr);gap:clamp(28px,5vw,78px);align-items:end;margin-bottom:clamp(28px,5vh,48px)}
.device-index{font-family:'IBM Plex Mono',monospace;font-size:9px;letter-spacing:.18em;color:var(--accent);margin-bottom:10px}
.device-name{font-family:'Archivo',sans-serif;font-size:clamp(40px,6vw,72px);font-weight:500;line-height:.9;letter-spacing:-.045em}
.device-copy{font-size:clamp(15px,1.2vw,18px);line-height:1.65;max-width:62ch}
.device-copy b{font-family:'IBM Plex Mono',monospace;font-size:9px;letter-spacing:.13em;color:var(--accent);font-weight:500}
.device-visuals{display:grid;grid-template-columns:1fr 1fr minmax(150px,.58fr);gap:clamp(16px,2.4vw,30px);align-items:end;max-width:1120px;margin-inline:auto}
.device-visuals .motion-proof{width:min(100%,250px);justify-self:end}
.resolved-system{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(0,1.2fr);gap:clamp(42px,7vw,100px);align-items:center;max-width:1050px;margin-inline:auto}
.resolved-system .context-figure{width:min(100%,430px,54vh)}
.final-detail{margin-top:clamp(28px,5vh,58px)}
.final-detail .fig img{object-position:center 62%}
.paired-evidence{max-width:1120px;margin-inline:auto}
.axiom-detail-grid{grid-template-columns:minmax(280px,.78fr) minmax(0,1.22fr)}
.axiom-detail-grid .portrait-feature{width:min(100%,440px,58vh)}
.aluminum-opening{grid-template-columns:minmax(300px,.72fr) minmax(0,1.28fr);max-width:1120px}
.aluminum-opening .opening-visual--tall{width:min(100%,420px,55vh)}
.aluminum-pair{max-width:840px}
.aluminum-detail-grid{grid-template-columns:minmax(260px,.7fr) minmax(0,1.3fr)}
.aluminum-detail-grid .portrait-feature--detail{width:min(100%,390px,56vh);justify-self:center}
.aluminum-trio{max-width:980px}
.phone-opening{grid-template-columns:minmax(300px,.72fr) minmax(0,1.28fr);max-width:1120px}
.phone-opening .opening-visual--tall{width:min(100%,430px,55vh)}
.phone-motion-grid{grid-template-columns:minmax(240px,.62fr) minmax(0,1.38fr)}
.phone-motion-figure{width:min(100%,360px,54vh);justify-self:center}
.phone-detail-trio{max-width:980px}
.phone-process-grid{max-width:920px}
.phone-final-grid{grid-template-columns:minmax(250px,.68fr) minmax(0,1.32fr)}
.phone-final-figure{width:min(100%,400px,56vh);justify-self:center}
.editorial-pair{grid-template-columns:1fr 1fr;max-width:1040px;margin-inline:auto}
.editorial-trio{grid-template-columns:repeat(3,minmax(0,1fr));max-width:1080px;margin-inline:auto}
.editorial-quad{grid-template-columns:repeat(4,minmax(0,1fr));max-width:1120px;margin-inline:auto}
.opening-visual--landscape{max-width:640px}
.motion-proof-wide{width:min(100%,920px);margin-inline:auto}
.pushpull-final-figure{width:min(50vw,760px);margin-inline:auto}
.portrait-evidence{width:min(100%,420px,56vh);justify-self:center}
.family-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(18px,2.4vw,30px);max-width:1120px;margin-inline:auto}
.family-grid figure:nth-child(n+5){margin-top:clamp(8px,2vh,18px)}
.sofa-family-grid{grid-template-columns:repeat(5,minmax(0,1fr));max-width:1280px}
.sofa-family-grid figure:nth-child(n+5){margin-top:0}
.pattern-set-overview{width:min(100%,960px);margin-inline:auto}
.material-strip{display:grid;grid-template-columns:minmax(240px,.7fr) minmax(0,1.3fr);gap:clamp(32px,6vw,88px);align-items:center;max-width:1040px;margin-inline:auto}
.material-strip--reverse{grid-template-columns:minmax(0,1.3fr) minmax(240px,.7fr)}
.light-palette{grid-template-columns:repeat(3,minmax(0,1fr));max-width:980px;margin-inline:auto}
.case-hero .fig img,.research-plate .fig img,.media-grid--mixed .fig img,.mechanism-grid .fig img,.light-state-grid .fig img,.final-detail .fig img{transition:transform .9s cubic-bezier(.22,1,.36,1),filter .6s}
@media(hover:hover){
  .case-hero:hover .fig img,.research-plate:hover .fig img,.media-grid--mixed figure:hover .fig img,.mechanism-grid figure:hover .fig img,.light-state-grid figure:hover .fig img,.final-detail:hover .fig img{transform:scale(1.012)}
}
@media(max-width:920px){
  .p-meta.six{grid-template-columns:repeat(3,1fr)}
  .p-meta.six .cell:nth-child(3n){border-right:none}
  .case-intro{grid-template-columns:1fr;gap:24px}
  .case-lead{max-width:620px}
  .case-intro .copy{padding-top:0}
  .spec-grid{grid-template-columns:1fr 1fr}
  .spec-grid div:nth-child(2){border-right:0}
  .spec-grid div:nth-child(-n+2){border-bottom:1px solid var(--line-soft)}
  .opening-grid{grid-template-columns:minmax(280px,.85fr) minmax(0,1.15fr);gap:32px;align-items:start}
  .opening-grid--landscape{grid-template-columns:minmax(380px,1fr) minmax(0,1fr)}
  .opening-brief .case-lead p{font-size:clamp(24px,3.7vw,32px)}
  .evidence-grid{gap:36px}
  .device-head{grid-template-columns:1fr;gap:18px}
  .sofa-family-grid{grid-template-columns:repeat(3,minmax(0,1fr));max-width:760px}
}
@media(max-width:720px){
  .p-meta.six{grid-template-columns:1fr 1fr}
  .p-meta.six .cell:nth-child(3n){border-right:1px solid var(--line-soft)}
  .p-meta.six .cell:nth-child(2n){border-right:none}
  .media-grid--mixed,.mechanism-grid,.light-state-grid,.sport-mixed,.research-slide-grid,.system-logic,.resolved-system,.editorial-pair,.editorial-trio,.material-strip,.material-strip--reverse,.light-palette{grid-template-columns:1fr}
  .editorial-quad,.family-grid{grid-template-columns:1fr 1fr}
  .sofa-family-grid{grid-template-columns:1fr 1fr}
  .media-grid--mixed{max-width:560px}
  .portrait-trio,.portrait-pair{max-width:560px}
  .research-plate .fig{aspect-ratio:4/3}
  .research-plate .fig img{object-position:center}
  .opening-sheet{padding-top:34px!important}
  .opening-grid{grid-template-columns:1fr;gap:44px}
  .opening-visual{width:min(100%,480px);margin-inline:auto}
  .opening-visual--tall{width:min(100%,420px)}
  .opening-brief .copy{margin-top:24px}
  .evidence-grid,.mechanism-evidence,.axiom-detail-grid{grid-template-columns:1fr;gap:42px}
  .aluminum-opening,.aluminum-detail-grid,.phone-opening,.phone-motion-grid,.phone-final-grid{grid-template-columns:1fr}
  .aluminum-pair,.aluminum-trio{max-width:560px}
  .phone-detail-trio,.phone-process-grid{max-width:560px}
  .evidence-figure--reference{width:min(100%,300px)}
  .evidence-figure--mechanism{width:min(100%,420px)}
  .translation-rail{grid-template-columns:1fr}
  .translation-rail div{border-right:0;border-bottom:1px solid var(--line-soft)}
  .translation-rail div:last-child{border-bottom:0}
  .system-logic .dashboard-figure{width:min(100%,270px)}
  .device-visuals{grid-template-columns:1fr 1fr;align-items:start}
  .device-visuals .motion-proof{grid-column:1/-1;width:min(72%,260px);justify-self:center}
  .resolved-system .context-figure{width:min(100%,380px);justify-self:center}
  .pushpull-final-figure{width:100%}
}
@media(max-width:480px){
  .editorial-quad,.family-grid{grid-template-columns:1fr}
  .sofa-family-grid{grid-template-columns:1fr}
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  .rv{opacity:1;transform:none}
  html{scroll-behavior:auto}
}