/* STRATA — architecture studio concept
   Original art direction. System fonts only, no external resources. */

/* ---------------------------------------------------------------- tokens */
:root{
  --sans:"Helvetica Neue",Helvetica,Inter,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"DejaVu Sans Mono",monospace;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Times New Roman",Georgia,serif;

  --paper:#F4F1EA;
  --paper-2:#EAE6DB;
  --ink:#15161A;
  --ink-soft:#4A4C52;
  --hair:rgba(21,22,26,.16);
  --hair-2:rgba(21,22,26,.30);
  --accent:#B93D18;
  --sun:#E9A020;
  --glazing:#2F4B8C;
  --room:rgba(21,22,26,.035);
  --room-hot:rgba(185,61,24,.10);
  --room-sel:rgba(185,61,24,.16);
  --shadow:rgba(21,22,26,.55);

  /* set by app.js from the selected material */
  --mat-tone:#B9B4AA;
  --mat-hatch:url(#p-concrete);
  --mat-contrast:#15161A;

  --edge:clamp(18px,5vw,74px);
  --rule:1px;
}
body[data-theme=ink]{
  --paper:#0E0F12;
  --paper-2:#16181C;
  --ink:#EFEDE6;
  --ink-soft:#9DA0A8;
  --hair:rgba(239,237,230,.20);
  --hair-2:rgba(239,237,230,.34);
  --accent:#FF6A3D;
  --room:rgba(239,237,230,.05);
  --room-hot:rgba(255,106,61,.14);
  --room-sel:rgba(255,106,61,.22);
  --shadow:rgba(0,0,0,.6);
}

/* ------------------------------------------------------------------ base */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:400 17px/1.55 var(--sans);letter-spacing:-.005em;
  transition:background-color .7s ease,color .7s ease;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
[hidden]{display:none!important}
h1,h2,h3{margin:0;font-weight:500;letter-spacing:-.04em;line-height:.94}
p{margin:0 0 1em}
b,strong{font-weight:600}
::selection{background:var(--accent);color:var(--paper)}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-999px;top:0;z-index:99;background:var(--ink);color:var(--paper);padding:14px 20px;font:600 13px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase}
.skip:focus{left:0}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
section[tabindex="-1"]:focus:not(:focus-visible){outline:none}

.defs{position:absolute;width:0;height:0;overflow:hidden}
.defs pattern circle{fill:#000;fill-opacity:.42}
.defs pattern path{fill:none;stroke:#000;stroke-opacity:.42}
#p-timber path{stroke:#FFF;stroke-opacity:.30}
#p-insul path{stroke:#000;stroke-opacity:.5}

/* fine drafting grid behind everything */
.sheet{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background:repeating-linear-gradient(90deg,var(--hair) 0 1px,transparent 1px 96px);
  opacity:.5;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 12%,#000 88%,transparent);
}

/* --------------------------------------------------------------- topbar */
.topbar{
  position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:24px;
  padding:14px var(--edge);background:var(--paper);
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:var(--rule) solid var(--hair);
}
.mark{
  font:600 19px/1 var(--sans);letter-spacing:.28em;color:inherit;text-decoration:none;
  display:flex;flex-direction:column;gap:5px;white-space:nowrap;
}
.mark span{font:400 9px/1 var(--mono);letter-spacing:.22em;color:var(--ink-soft)}
.topnav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.topnav::-webkit-scrollbar{display:none}
.topnav a{
  color:var(--ink-soft);text-decoration:none;padding:10px 12px;border-radius:2px;
  font:500 12px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;white-space:nowrap;
  transition:color .2s,background-color .2s;
}
.topnav a:hover{color:var(--ink);background:var(--room-hot)}
.cta{
  color:var(--paper);background:var(--ink);text-decoration:none;padding:13px 18px;
  font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;white-space:nowrap;
  transition:background-color .2s,transform .2s;
}
.cta:hover{background:var(--accent);transform:translateY(-1px)}
.progress{position:absolute;left:0;right:0;bottom:-1px;height:2px}
.progress i{display:block;height:100%;background:var(--accent);transform:scaleX(0);transform-origin:0 50%}

/* ----------------------------------------------------------------- rail */
.rail{position:fixed;right:calc(var(--edge) - 10px);top:50%;transform:translateY(-50%);z-index:15}
.rail ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px;align-items:flex-end}
.rail a{
  display:flex;align-items:center;gap:10px;padding:7px 10px;text-decoration:none;
  color:var(--ink-soft);font:500 10px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;
  opacity:.55;transition:opacity .3s,color .3s,letter-spacing .3s;
}
.rail a b{font-weight:500;color:var(--accent);opacity:0;transition:opacity .3s}
.rail a::after{content:"";width:14px;height:1px;background:currentColor;transition:width .3s}
.rail a:hover,.rail a[data-current]{opacity:1;color:var(--ink)}
.rail a[data-current]{letter-spacing:.24em}
.rail a[data-current] b{opacity:1}
.rail a[data-current]::after{width:34px;background:var(--accent)}

/* ----------------------------------------------------------------- hero */
main{position:relative;z-index:1}
.hero{padding:min(13vh,120px) var(--edge) 60px;max-width:1560px;margin:0 auto;position:relative}
.kicker{font:500 11px/1.5 var(--mono);letter-spacing:.24em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 20px}
.stack{margin:0;border-top:var(--rule) solid var(--hair)}
.stack a{
  display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  border-bottom:var(--rule) solid var(--hair);padding:min(1.6vh,16px) 0;
  text-decoration:none;color:inherit;position:relative;
}
.stack span{
  font-size:clamp(52px,13.2vw,196px);line-height:.86;letter-spacing:-.055em;font-weight:500;
  transition:transform .5s cubic-bezier(.2,.8,.2,1),color .3s;transform-origin:0 50%;display:block;
}
.stack em{
  font:400 12px/1.5 var(--mono);letter-spacing:.04em;font-style:normal;color:var(--ink-soft);
  text-align:right;max-width:26ch;flex:none;transition:color .3s;
}
.stack a::before{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--accent);
  transform:scaleX(0);transform-origin:0 50%;transition:transform .55s cubic-bezier(.2,.8,.2,1);
}
.stack a:hover span,.stack a:focus-visible span{transform:translateX(14px);color:var(--accent)}
.stack a:hover::before,.stack a:focus-visible::before{transform:scaleX(1)}
.stack a:hover em{color:var(--ink)}

.hero-foot{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(24px,5vw,80px);margin-top:44px;align-items:start}
.standfirst{font:400 clamp(19px,2vw,25px)/1.4 var(--serif);letter-spacing:-.01em;margin:0}
.disclosure{
  font:400 13.5px/1.6 var(--sans);color:var(--ink-soft);margin:0;
  border-left:2px solid var(--accent);padding-left:16px;
}
.disclosure b{color:var(--ink)}
.scroll-cue{
  display:inline-flex;align-items:center;gap:10px;margin-top:52px;text-decoration:none;color:var(--ink-soft);
  font:500 11px/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;
}
.scroll-cue:hover{color:var(--accent)}

/* -------------------------------------------------------------- chapter */
.chapter{padding:clamp(70px,11vh,150px) var(--edge);max-width:1560px;margin:0 auto;border-top:var(--rule) solid var(--hair)}
.chead{max-width:1100px;margin-bottom:clamp(38px,5vw,72px)}
.chead h2{font-size:clamp(38px,6.4vw,96px);letter-spacing:-.05em;margin:0}
.lede{font:400 clamp(17px,1.5vw,21px)/1.5 var(--serif);color:var(--ink);max-width:62ch;margin-top:26px}
.prose p{font:400 17px/1.62 var(--serif);color:var(--ink-soft);max-width:58ch}
.prose .lede{color:var(--ink)}
.note{font:400 12.5px/1.55 var(--sans);color:var(--ink-soft);max-width:70ch}
.callout-note{font:400 14.5px/1.55 var(--sans);border-left:2px solid var(--accent);padding-left:14px;color:var(--ink)}

.reveal{opacity:1}
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .8s cubic-bezier(.2,.8,.2,1),transform .8s cubic-bezier(.2,.8,.2,1);transition-delay:calc(var(--i,0)*70ms)}
.js .reveal.in{opacity:1;transform:none}

/* -------------------------------------------------------------- chapter 01 */
.ground-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:clamp(28px,5vw,84px);align-items:start}
.datasheet{margin:0;border-top:var(--rule) solid var(--hair-2)}
.datasheet div{display:flex;justify-content:space-between;gap:18px;padding:11px 0;border-bottom:var(--rule) solid var(--hair)}
.datasheet dt{font:500 10.5px/1.4 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.datasheet dd{margin:0;font:400 13.5px/1.4 var(--mono);text-align:right}
.plate{margin:clamp(40px,6vw,90px) 0 0}
.plate img{width:100%;filter:saturate(.82) contrast(1.03)}
.plate figcaption{font:400 12.5px/1.6 var(--sans);color:var(--ink-soft);margin-top:14px;max-width:78ch}
.plate figcaption b{color:var(--ink)}

/* ----------------------------------------------------------- the viewer */
.viewer{border:var(--rule) solid var(--hair-2);background:var(--paper-2)}
.viewer-bar{display:flex;align-items:center;gap:20px;padding:10px 12px;border-bottom:var(--rule) solid var(--hair)}
.tabs{display:flex;gap:2px}
.tabs button{
  appearance:none;border:0;background:transparent;color:var(--ink-soft);cursor:pointer;
  padding:12px 16px;min-height:44px;font:500 11.5px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;
  position:relative;transition:color .25s;
}
.tabs button::after{content:"";position:absolute;left:8px;right:8px;bottom:6px;height:1px;background:var(--accent);transform:scaleX(0);transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.tabs button:hover{color:var(--ink)}
.tabs button[aria-selected=true]{color:var(--ink)}
.tabs button[aria-selected=true]::after{transform:scaleX(1)}
.viewer-meta{margin:0 0 0 auto;font:400 11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft)}

.stage{position:relative;aspect-ratio:3/2;overflow:hidden;padding:clamp(10px,2vw,28px)}
.panel{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .45s ease}
.panel[data-active]{position:relative;inset:auto;height:100%;opacity:1;visibility:visible;animation:wipe .75s cubic-bezier(.22,.75,.2,1)}
.panel[data-active]::after{
  content:"";position:absolute;top:0;bottom:0;left:0;width:1px;opacity:0;background:var(--accent);
  animation:plot .75s cubic-bezier(.22,.75,.2,1);pointer-events:none;
}
@keyframes wipe{from{clip-path:inset(0 100% 0 0)}to{clip-path:inset(0 0 0 0)}}
@keyframes plot{from{left:0;opacity:1}90%{opacity:1}to{left:100%;opacity:0}}
.panel:focus-visible{outline:2px solid var(--accent);outline-offset:4px}

.viewer-foot{border-top:var(--rule) solid var(--hair);padding:16px clamp(12px,2vw,28px)}
.legend{list-style:none;counter-reset:l;margin:0;padding:0;display:grid;gap:7px}
.legend li{counter-increment:l;position:relative;padding-left:30px;font:400 13px/1.5 var(--sans);color:var(--ink-soft)}
.legend li::before{
  content:counter(l,decimal-leading-zero);position:absolute;left:0;top:1px;
  font:500 10.5px/1.5 var(--mono);letter-spacing:.1em;color:var(--accent);
}
.legend b{color:var(--ink);font-weight:600}

/* -------------------------------------------------------- drawing styles */
/* fill lives on the root so single-class rules below can override it without a
   specificity fight, and so the media-query type sizes still win */
.dwg{width:100%;height:100%;display:block;overflow:visible;fill:var(--ink)}
.dwg *{vector-effect:non-scaling-stroke}
.dwg text{font-family:var(--mono);letter-spacing:.06em}
.mid{text-anchor:middle}
.t-dim{font-size:4.2px;fill:var(--ink-soft)}
.t-lbl{font-size:4.6px;letter-spacing:.16em}
.t-grid,.t-grid text{font-size:5px;text-anchor:middle;dominant-baseline:central}
.t-num{font-size:4px;text-anchor:middle;dominant-baseline:central}
.t-room{font-size:4.4px;letter-spacing:.13em}
.t-area{font-size:4px;fill:var(--ink-soft)}

.ink line,.ink path,.ink rect,.ink circle{stroke-linecap:square}
.w-hair,.w-hair line{stroke:var(--hair-2);stroke-width:.6;fill:none}
.w-thin,.w-thin line{stroke:var(--ink-soft);stroke-width:.8;fill:none}
.w-med{stroke:var(--ink);stroke-width:1.2;fill:none}
.w-heavy{stroke:var(--ink);stroke-width:2;fill:none}
.w-grid line{stroke:var(--hair-2);stroke-width:.6;stroke-dasharray:9 3 1.5 3;fill:none}
.w-cut{stroke:var(--accent);stroke-width:1.6;stroke-dasharray:10 3 2 3;fill:none}

.mat-tone{fill:var(--mat-tone);transition:fill .55s ease}
.mat-hatch{fill:var(--mat-hatch);stroke:none;pointer-events:none}
.poche{fill:var(--ink);stroke:none}
.poche-line{stroke:var(--ink);stroke-width:1}
.poche-line-only{stroke:var(--ink);stroke-width:1}
.ground-fill{fill:url(#p-ground);opacity:.55;stroke:none}
.glass rect,rect.glass{fill:var(--glazing);fill-opacity:.22;stroke:var(--glazing);stroke-width:.8}
.deck{fill:none;stroke:var(--hair-2);stroke-width:.8;stroke-dasharray:5 3}
.deck-hatch{fill:url(#p-deck);opacity:.5;stroke:none}
.hearth{fill:var(--ink);opacity:.88;stroke:none}
.steel{fill:#2A2C30;stroke:none}
.joinery rect{fill:#C09A6B;fill-opacity:.5;stroke:var(--mat-contrast);stroke-width:.9}
.joinery line{stroke:var(--mat-contrast);stroke-width:.7;opacity:.8}
.figure circle,.figure path{stroke:var(--ink-soft);stroke-width:1;fill:none}
.callout circle{fill:var(--paper);stroke:var(--ink);stroke-width:1}
.callout line{stroke:var(--ink);stroke-width:.7}
.bubble circle{fill:var(--paper);stroke:var(--ink-soft);stroke-width:.8}
.marker path{fill:var(--accent);stroke:none}
.marker .flag{fill:var(--paper);stroke:var(--accent);stroke-width:1.2}
.marker text{fill:var(--accent)}
.north circle{stroke:var(--ink-soft);stroke-width:.8}
.north path{fill:var(--ink)}
.north text{fill:var(--ink)}
.levels .lvl{fill:var(--ink-soft)}
.scalebar rect{fill:var(--ink)}
.scalebar .sb-out{fill:none;stroke:var(--ink);stroke-width:.8}
.door path{stroke:var(--ink-soft);stroke-width:.9}
.dims text{fill:var(--ink-soft)}

.room{cursor:pointer;outline:none}
.room-fill{fill:var(--room);stroke:transparent;stroke-width:2;transition:fill .3s ease}
.room:hover .room-fill{fill:var(--room-hot)}
.room[aria-pressed=true] .room-fill{fill:var(--room-sel);stroke:var(--accent)}
.room:focus-visible .room-fill{stroke:var(--accent);stroke-dasharray:5 2.5}
.room[aria-pressed=true] .t-room{fill:var(--accent)}

/* sun study */
.sunpath{stroke:var(--hair-2);stroke-width:.8;stroke-dasharray:4 3}
.sunticks line{stroke:var(--hair-2);stroke-width:.8}
.sunticks text{fill:var(--ink-soft)}
/* No CSS transitions on the solar geometry: the slider redraws every frame and
   preset jumps are tweened in app.js, so all parts stay in step. */
.sun-dot{fill:var(--sun);stroke:var(--ink);stroke-width:.8}
#sun-alt-label{fill:var(--ink);font-size:3.4px}
.ray{stroke:var(--sun);stroke-width:1.4}
.ray.dashed{stroke-width:.9;stroke-dasharray:5 3;opacity:.75}
.sunlit{fill:var(--sun);opacity:.85;stroke:none}
.shaded{fill:var(--shadow);opacity:.55;stroke:none}
.slab{fill:var(--ink);opacity:.85;stroke:none}

/* wall detail */
.dwg-detail{height:auto;aspect-ratio:372/152}
.dwg-detail .t-dim{font-size:5.4px}
.dwg-detail .t-lbl{font-size:5.6px}
.dwg-detail .t-num{font-size:5px}
.wd-rect{stroke:var(--ink);stroke-width:.8;transition:x .45s ease,width .45s ease,fill .45s ease}
.wd-hatch{stroke:none;pointer-events:none;transition:x .45s ease,width .45s ease}
/* leader, bubble and number ride together on one transform so they never drift */
.wd-num{transition:transform .45s ease}
.wd-num line{stroke:var(--ink-soft);stroke-width:.7}
.wd-num circle{fill:var(--paper);stroke:var(--ink);stroke-width:.9}

#view-interior .t-dim{font-size:2.2px}
#view-interior .t-lbl{font-size:2.4px;letter-spacing:.14em}
#view-interior .t-num{font-size:2.6px}
.sunfig .t-dim{font-size:3px}
.sunfig .t-lbl{font-size:3.2px;letter-spacing:.16em}

/* ------------------------------------------------- schedule + room detail */
.fabric-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,64px);margin-top:clamp(30px,4vw,58px)}
.schedule-wrap h3,.detail h3,.picker h3,.spec h3,.studies h3{font-size:clamp(22px,2.4vw,30px);letter-spacing:-.03em;margin:0 0 18px}
.schedule{list-style:none;margin:0 0 16px;padding:0;border-top:var(--rule) solid var(--hair-2)}
.schedule button{
  width:100%;display:flex;align-items:baseline;gap:14px;min-height:48px;
  background:transparent;border:0;border-bottom:var(--rule) solid var(--hair);
  padding:12px 8px;cursor:pointer;color:var(--ink-soft);text-align:left;font:inherit;
  transition:background-color .25s,color .25s,padding-left .25s;
}
.schedule button:hover{background:var(--room-hot);color:var(--ink);padding-left:14px}
.schedule button[aria-pressed=true]{color:var(--ink);background:var(--room-sel);padding-left:14px}
.schedule .n{font:500 11px/1.4 var(--mono);letter-spacing:.12em;color:var(--accent);flex:none}
.schedule .nm{font:500 15px/1.3 var(--sans);letter-spacing:-.01em}
.schedule .a{margin-left:auto;font:400 13px/1.3 var(--mono);flex:none}
.total{font:400 13.5px/1.6 var(--mono);color:var(--ink-soft);margin:0 0 10px}
.total strong{color:var(--ink);font-weight:500}

.detail{border:var(--rule) solid var(--hair-2);padding:clamp(20px,2.6vw,34px);align-self:start;background:var(--paper-2)}
.detail dl{margin:22px 0 0;border-top:var(--rule) solid var(--hair-2)}
.detail dl div,.specsheet div{display:flex;justify-content:space-between;gap:18px;padding:10px 0;border-bottom:var(--rule) solid var(--hair)}
.detail dt,.specsheet dt{font:500 10.5px/1.5 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);flex:none}
.detail dd,.specsheet dd{margin:0;font:400 13.5px/1.5 var(--mono);text-align:right}

/* ------------------------------------------------------------ chapter 03 */
.skin-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(26px,4vw,70px);align-items:start}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:30px}
.chip{
  display:flex;align-items:center;gap:11px;min-height:48px;padding:9px 16px 9px 9px;cursor:pointer;
  background:transparent;border:var(--rule) solid var(--hair-2);color:var(--ink-soft);
  font:500 12px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;
  transition:border-color .25s,color .25s,transform .25s,background-color .25s;
}
.chip i{width:26px;height:26px;display:block;border:var(--rule) solid var(--hair-2);flex:none}
.chip:hover{color:var(--ink);border-color:var(--ink-soft);transform:translateY(-2px)}
.chip[aria-checked=true]{color:var(--ink);border-color:var(--accent);background:var(--room-sel)}
.detailfig{margin:0 0 22px}
.detailfig figcaption{font:400 12.5px/1.6 var(--sans);color:var(--ink-soft);margin-top:12px;max-width:62ch}
.buildup li{font-variant-numeric:tabular-nums}
.spec{border:var(--rule) solid var(--hair-2);padding:clamp(20px,2.6vw,34px);background:var(--paper-2)}
.specsheet{margin:22px 0;border-top:var(--rule) solid var(--hair-2)}
.spec .lede{font-size:17px;margin-top:14px}

/* ------------------------------------------------------------ chapter 04 */
.sun{display:grid;grid-template-columns:1.3fr .7fr;gap:clamp(26px,4vw,64px);align-items:start}
.sunfig{border:var(--rule) solid var(--hair-2);background:var(--paper-2);padding:clamp(12px,2vw,26px)}
.sunfig .dwg{aspect-ratio:208/139;height:auto}
.sunfig .legend{margin-top:16px;border-top:var(--rule) solid var(--hair);padding-top:14px}
.slider-label{display:block;font:500 10.5px/1.5 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:12px}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:44px;background:transparent;cursor:pointer;margin:0;
}
input[type=range]::-webkit-slider-runnable-track{height:2px;background:var(--hair-2)}
input[type=range]::-moz-range-track{height:2px;background:var(--hair-2)}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;width:20px;height:20px;margin-top:-9px;border-radius:50%;
  background:var(--sun);border:2px solid var(--ink);
}
input[type=range]::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--sun);border:2px solid var(--ink)}
input[type=range]:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.presets{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 26px}
.presets button{
  min-height:44px;padding:11px 13px;cursor:pointer;background:transparent;
  border:var(--rule) solid var(--hair-2);color:var(--ink-soft);
  font:500 11px/1 var(--mono);letter-spacing:.08em;transition:color .2s,border-color .2s,background-color .2s;
}
.presets button:hover{color:var(--ink);border-color:var(--ink-soft)}
.presets button[aria-pressed=true]{color:var(--ink);border-color:var(--accent);background:var(--room-sel)}
.readout{margin:0 0 20px;border-top:var(--rule) solid var(--hair-2)}
.readout div{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:var(--rule) solid var(--hair)}
.readout dt{font:500 10.5px/1.5 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.readout dd{margin:0;font:400 15px/1.4 var(--mono);font-variant-numeric:tabular-nums}
.verdict{font:400 clamp(17px,1.7vw,22px)/1.4 var(--serif);border-left:2px solid var(--sun);padding-left:16px}

/* ------------------------------------------------------------ chapter 05 */
.studio-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(26px,4vw,70px);align-items:start}
.process{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.process li{display:grid;grid-template-columns:60px 1fr;gap:18px;padding:22px 0;border-top:var(--rule) solid var(--hair)}
.process b{font:500 11px/1.4 var(--mono);letter-spacing:.16em;color:var(--accent)}
.process h3{font-size:clamp(20px,2.2vw,28px);margin:0 0 8px}
.process p{margin:0;font:400 15px/1.55 var(--serif);color:var(--ink-soft)}
.studylist{list-style:none;margin:0 0 16px;padding:0;border-top:var(--rule) solid var(--hair-2)}
.studylist li{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;padding:13px 0;border-bottom:var(--rule) solid var(--hair)}
.studylist b{font:500 15px/1.3 var(--sans)}
.studylist span{font:400 12.5px/1.3 var(--mono);color:var(--ink-soft)}
.studylist i{margin-left:auto;font:400 13px/1.3 var(--mono);font-style:normal;color:var(--ink-soft)}

.briefwrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(26px,4vw,70px);margin-top:clamp(40px,6vw,90px);border-top:var(--rule) solid var(--hair-2);padding-top:clamp(30px,4vw,56px);align-items:start}
.briefcopy h3{font-size:clamp(26px,3.2vw,42px);margin:0 0 18px}
.briefcopy p{font:400 16px/1.55 var(--serif);color:var(--ink-soft);max-width:46ch}
.brief{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{display:flex;flex-direction:column;gap:8px}
.field.wide,.actions,.briefout{grid-column:1/-1}
label{font:500 10.5px/1.5 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
input,select,textarea{
  font:400 16px/1.4 var(--sans);color:var(--ink);background:transparent;
  border:0;border-bottom:var(--rule) solid var(--hair-2);padding:12px 2px;min-height:48px;
  border-radius:0;transition:border-color .25s;
}
textarea{resize:vertical;min-height:88px}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,currentColor 50%),linear-gradient(135deg,currentColor 50%,transparent 50%);background-position:right 10px center,right 5px center;background-size:5px 5px;background-repeat:no-repeat}
input:hover,select:hover,textarea:hover{border-color:var(--ink-soft)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);border-bottom-width:2px}
input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
::placeholder{color:var(--ink-soft);opacity:.5}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.actions button{
  min-height:52px;padding:15px 24px;cursor:pointer;font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  background:transparent;border:var(--rule) solid var(--hair-2);color:var(--ink-soft);transition:all .22s;
}
.actions button:hover{color:var(--ink);border-color:var(--ink-soft)}
.actions .primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.actions .primary:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.briefout{
  display:block;border:var(--rule) solid var(--accent);padding:clamp(18px,2.4vw,30px);
  background:var(--paper-2);font:400 15px/1.6 var(--sans);
}
.briefout h4{margin:0 0 14px;font:500 11px/1.5 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.briefout dl{margin:0 0 16px;display:grid;gap:6px}
.briefout dl div{display:flex;gap:14px}
.briefout dt{font:500 10.5px/1.6 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);min-width:112px}
.briefout dd{margin:0;font:400 14.5px/1.6 var(--sans)}
.briefout .said{font:400 16px/1.5 var(--serif);border-left:2px solid var(--hair-2);padding-left:14px;margin:0 0 16px}

/* --------------------------------------------------------------- footer */
footer{border-top:var(--rule) solid var(--hair-2);padding:clamp(40px,6vw,80px) var(--edge);max-width:1560px;margin:0 auto}
.footgrid{display:grid;grid-template-columns:auto 1.4fr 1fr;gap:clamp(24px,4vw,64px);align-items:start}
.colophon{font:400 12.5px/1.6 var(--sans);color:var(--ink-soft);margin:0}
.backlink{
  display:inline-block;margin-top:44px;padding:16px 26px;text-decoration:none;
  border:var(--rule) solid var(--ink);color:var(--ink);
  font:500 12px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;
  transition:background-color .25s,color .25s;
}
.backlink:hover{background:var(--ink);color:var(--paper)}

/* ----------------------------------------------------------- responsive */
@media (max-width:1180px){
  .rail{display:none}
  .footgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:960px){
  .ground-grid,.fabric-grid,.skin-grid,.sun,.studio-grid,.briefwrap,.hero-foot{grid-template-columns:1fr}
  .footgrid{grid-template-columns:1fr}
  .stack a{flex-direction:column;align-items:flex-start;gap:6px}
  .stack em{text-align:left;max-width:none}
}
@media (max-width:720px){
  body{font-size:16px}
  .topbar{flex-wrap:wrap;gap:12px 16px;padding:12px var(--edge)}
  .topnav{order:3;width:100%;margin-left:0;border-top:var(--rule) solid var(--hair);padding-top:6px}
  .cta{margin-left:auto}
  .stage{aspect-ratio:1/1}
  .brief{grid-template-columns:1fr}
  .viewer-bar{flex-wrap:wrap;gap:8px}
  .viewer-meta{margin-left:0;width:100%;order:3}
  .tabs{width:100%}
  .tabs button{flex:1;padding:12px 6px;letter-spacing:.1em}
  /* drawing annotation has to grow as the sheet shrinks */
  .t-dim{font-size:6px}
  .t-lbl{font-size:6px}
  .t-grid{font-size:6.6px}
  .t-room{font-size:6px}
  .t-area{font-size:5.4px}
  #view-interior .t-dim{font-size:3.2px}
  #view-interior .t-lbl{font-size:3.2px}
  #view-interior .t-num{font-size:3.4px}
  .sunfig .t-dim{font-size:4.4px}
  .sunfig .t-lbl{font-size:4.4px}
  #sun-alt-label{font-size:4.8px}
  .dwg-detail .t-dim{font-size:8px}
  .dwg-detail .t-lbl{font-size:8px}
  .dwg-detail .t-num{font-size:7px}
  .detail dl div,.specsheet div,.readout div,.datasheet div{flex-direction:column;gap:3px}
  .detail dd,.specsheet dd,.readout dd,.datasheet dd{text-align:left}
  .briefout dl div{flex-direction:column;gap:2px}
}
@media (max-width:420px){
  .process li{grid-template-columns:1fr;gap:6px}
  .studylist i{margin-left:0}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;transition-delay:0ms!important;
  }
  .panel[data-active]::after{display:none}
}

@media print{
  .rail,.topbar,.sheet,.scroll-cue{display:none}
  .panel{position:static!important;visibility:visible!important;opacity:1!important;page-break-inside:avoid}
  .stage{aspect-ratio:auto;height:auto}
}