:root{
  --ink:#22313f;--mute:#5d6b78;--acc:#c8553d;--bg:#f2efe9;--card:#fff;--line:#d9d4ca;--in:#fff8e1;
  /* Soft grid: 8pt base (1rem = 16px) */
  --space-1:.25rem;  /* 4px  tight inline */
  --space-2:.5rem;   /* 8px  compact */
  --space-3:.75rem;  /* 12px input/header */
  --space-4:1rem;    /* 16px default gap */
  --space-6:1.5rem;  /* 24px card / component */
  --space-8:2rem;    /* 32px between sections */
  --space-12:3rem;   /* 48px */
  --space-16:4rem;   /* 64px */
  --space-section:clamp(var(--space-4),2vw + .5rem,var(--space-8));
  --wrap-max:53.75rem; /* ~860px readable calculator width */
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-variant-numeric:tabular-nums}
/* Hybrid container: fluid gutters, capped readable measure */
.wrap{width:min(100% - 2 * var(--space-4),var(--wrap-max));margin-inline:auto}
.top{border-bottom:3px solid var(--acc);background:var(--card)}
.top .wrap{display:flex;gap:var(--space-3);align-items:baseline;padding-block:var(--space-3)}
.brand{font-weight:800;letter-spacing:.02em}.tag{color:var(--mute);font-size:14px}
/* Fluid h1 between ~375 and desktop anchors */
h1{font-size:clamp(1.75rem,1.45rem + 1.1vw,2.125rem);line-height:1.15;margin-block:var(--space-6) var(--space-2)}
h2{font-size:18px;margin:0 0 var(--space-3)}
h3{font-size:15px;margin:0}
.intro{margin-block-end:var(--space-section)}
.intro p{margin:0 0 var(--space-4);color:var(--mute)}
.card{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:var(--space-4);margin-block:var(--space-4)}
.room{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:var(--space-3) var(--space-4);margin:0 0 var(--space-3)}
.room-h{display:flex;gap:var(--space-2);align-items:center;margin-block-end:var(--space-2)}.room-h input{font-weight:700;flex:1}
label{display:flex;flex-direction:column;font-size:13px;color:var(--mute);gap:var(--space-1)}
input,select{font:inherit;color:var(--ink);background:var(--in);border:1px solid var(--line);border-radius:4px;padding:var(--space-2);min-height:40px;width:100%}
input:focus,select:focus{outline:2px solid var(--acc);outline-offset:0}
/* Room / coverage field grids: 2 → 3 → 6 cols */
.grid3,.grid2{display:grid;gap:var(--space-2)}
.grid3{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid2{grid-template-columns:repeat(2,minmax(0,1fr))}
.checks{display:flex;flex-wrap:wrap;gap:var(--space-1) var(--space-4);margin-block-start:var(--space-2)}
.checks label{flex-direction:row;align-items:center;gap:var(--space-2);font-size:14px;color:var(--ink);min-height:44px;padding-block:var(--space-2);cursor:pointer}
.checks input{width:22px;min-height:22px;height:22px;flex-shrink:0}
.btn{display:inline-block;font:inherit;font-weight:600;background:var(--ink);color:#fff;border:0;border-radius:4px;padding:var(--space-3) var(--space-4);min-height:44px;text-decoration:none;cursor:pointer;margin-block-start:var(--space-2)}
.btn.ghost{background:transparent;color:var(--ink);border:1px dashed var(--mute);width:100%}
.x{background:none;border:0;color:var(--mute);font-size:22px;min-width:44px;min-height:40px;cursor:pointer}
.mt-2{margin-block-start:var(--space-2)}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:var(--space-2) var(--space-1);border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--mute)}
.n{text-align:right;white-space:nowrap}td b{font-size:17px}
.steps{margin-block-start:var(--space-3)}.steps summary{cursor:pointer;font-weight:600}
.steps p{font-size:13px;margin-block:var(--space-2);font-family:ui-monospace,Menlo,Consolas,monospace;overflow-wrap:anywhere}
.small{font-size:13px}.muted{color:var(--mute);font-weight:400}
ul.small{padding-inline-start:var(--space-6)}
.cant{background:#faf8f4}
.range{font-size:24px;font-weight:800}
.flag{background:#fbf3ef;border:1px solid var(--line);border-radius:4px;padding:var(--space-2) var(--space-3);font-size:14px;margin-block:var(--space-2)}
.err{color:var(--acc);font-weight:600}
footer{padding-block:var(--space-2) var(--space-8)}.print-only{display:none}
/* Guide article rhythm (shared stylesheet) */
.g p,.g li{max-width:68ch}
.g h2{margin-block-start:var(--space-8)}
.g table{margin-block:var(--space-2) var(--space-4)}
code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;background:var(--in);padding:var(--space-1);border-radius:3px}
/* Mid (~375+): 3 cols for field grids */
@media (min-width:375px){
  .grid3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
/* Wide (≥768): room dimension strip → 6 cols */
@media (min-width:768px){
  .room .grid3{grid-template-columns:repeat(6,minmax(0,1fr))}
}
/* Desktop mockup anchor: slightly larger section air */
@media (min-width:1440px){
  .card{padding:var(--space-6)}
}
@media print{
  body{background:#fff;font-size:12pt}
  .top,.intro,#rooms,#add,#photo,.scan,.scan-out,.btn,.cant,footer,.steps summary,#cov,.noprint{display:none!important}
  .print-only{display:block;position:static;margin-block-end:8pt;font-size:14pt}
  .card{border:0;padding:0;margin:0 0 12pt}
  .steps{display:block}.steps[open] div,.steps div{display:block}
}
/* 3D hero: fixed aspect box so nothing shifts when WebGL arrives */
.hero3d{position:relative;margin:0 0 var(--space-6);aspect-ratio:16/10;background:radial-gradient(120% 90% at 50% 20%,#fffaf2,#e8e2d7);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.hero3d-c,.hero3d-f{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero3d-f{padding:8%}.hero3d.live .hero3d-f{display:none}
.hero3d-o{position:absolute;left:var(--space-3);bottom:var(--space-3);background:rgba(255,255,255,.88);backdrop-filter:blur(6px);border-radius:6px;padding:var(--space-2) var(--space-3);font-size:13px;color:var(--mute);display:flex;flex-direction:column;box-shadow:0 2px 10px rgba(34,49,63,.1)}
.hero3d-o b{font-size:20px;color:var(--ink)}
@media print{.hero3d{display:none!important}}
/* Room scan (beta): one file fills a room in place; preview lazy-loads with scan.js */
.scan{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-2) var(--space-3);margin-block-start:var(--space-3)}
.scan-btn{display:inline-flex;flex-direction:row;align-items:center;gap:var(--space-2);font-size:14px;font-weight:600;color:var(--ink);background:var(--card);border:1px solid var(--ink);border-radius:4px;padding:var(--space-2) var(--space-3);min-height:44px;cursor:pointer}
.scan-btn:hover{background:var(--bg)}.scan-btn:focus-within{outline:2px solid var(--acc);outline-offset:2px}
.beta{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--mute);border:1px solid var(--line);border-radius:999px;padding:0 var(--space-2);line-height:1.6}
.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}
.scan-out{margin-block-start:var(--space-3)}.scan-out:empty{display:none}.scan-out>p{margin:0}
.scan-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:var(--space-3) var(--space-4);padding-block-start:var(--space-3);border-top:1px solid var(--line)}
.scan-prev,.scan-facts{grid-column:span 6;min-width:0}
.scan-prev{position:relative;aspect-ratio:16/10;display:grid;place-items:center;background:radial-gradient(120% 90% at 50% 20%,#fffaf2,#e8e2d7);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.scan-c{position:absolute;inset:0;width:100%;height:100%;display:block}
.scan-facts h3{display:flex;align-items:center;gap:var(--space-2)}
.scan-facts p{margin:0 0 var(--space-2)}.scan-facts .flag{margin:0 0 var(--space-2)}.scan-file{overflow-wrap:anywhere}
@media (min-width:768px){.scan-prev,.scan-facts{grid-column:span 3}}
/* Painter guides (SEO pages): tool cards, outputs, sources. 8pt tokens, no accent side bars. */
.tool{display:grid;gap:var(--space-4);grid-template-columns:repeat(auto-fit,minmax(min(14rem,100%),1fr));align-items:end}
.out{display:grid;gap:var(--space-2);grid-template-columns:repeat(auto-fit,minmax(min(11rem,100%),1fr));margin-block-start:var(--space-4)}
.out div{background:var(--bg);border-radius:6px;padding:var(--space-3) var(--space-4)}
.out b{display:block;font-size:clamp(1.25rem,1.1rem + .6vw,1.5rem);line-height:1.2}
.out span{font-size:13px;color:var(--mute)}
.eg{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--acc)}
.src{font-size:13px;color:var(--mute);padding-inline-start:var(--space-6)}
.src li{margin-block-end:var(--space-1)}
.g .card h2{margin-block-start:0}
.tabs-list{display:grid;gap:var(--space-2);grid-template-columns:repeat(auto-fit,minmax(min(15rem,100%),1fr));padding:0;list-style:none}
.tabs-list li{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:var(--space-3) var(--space-4)}
.g .tbl{overflow-x:auto}.g .tbl:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
/* ===== Brand pass 2026-10-16: painter's spec sheet. Fonts self-hosted (fonts/, OFL). ===== */
@font-face{font-family:"Barlow Condensed";src:url(/fonts/BarlowCondensed-SemiBold.woff) format("woff");font-weight:600;font-display:swap}
@font-face{font-family:"Barlow Condensed";src:url(/fonts/BarlowCondensed-Bold.woff) format("woff");font-weight:700;font-display:swap}
@font-face{font-family:"Source Serif Pro";src:url(/fonts/SourceSerifPro-Regular.woff) format("woff");font-weight:400;font-display:swap}
@font-face{font-family:"Source Serif Pro";src:url(/fonts/SourceSerifPro-Semibold.woff) format("woff");font-weight:600;font-display:swap}
:root{
  --primer:#f7f5ef;   /* primer white */
  --canvas:#e7dfcf;   /* drop cloth */
  --tape:#dcc794;     /* masking tape */
  --ink:#24211d;--mute:#6a6257;--line:#cfc4ae;
  --acc:#1d5bb5;      /* painter's-tape blue, the one strong color */
  --bg:var(--canvas);--card:var(--primer);--in:#fffdf7;
  --display:"Barlow Condensed","Arial Narrow",sans-serif;
  --body:"Source Serif Pro",Georgia,serif;
  --ticks:repeating-linear-gradient(90deg,var(--ink) 0 1px,transparent 1px 8px),repeating-linear-gradient(90deg,var(--ink) 0 1px,transparent 1px 64px);
}
body{font-family:var(--body);background:var(--canvas)}
h1,h2,h3,th,label,.btn,.brand,.tag,.range,.beta,.eg,.scan-btn,.steps summary,.hero3d-o b,.out b,td b{font-family:var(--display);letter-spacing:.01em}
h1{font-weight:700;text-transform:uppercase;font-size:clamp(2.25rem,1.6rem + 2.4vw,3.5rem);line-height:.95;letter-spacing:0}
h2{font-size:1.375rem;font-weight:700;text-transform:uppercase;letter-spacing:.03em}
h3{font-size:1.125rem;font-weight:600}
label{font-size:.875rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}
th{font-size:.875rem;font-weight:600}
/* header: wordmark on a tape-measure rule */
.top{background:var(--primer);border-bottom:0;position:relative;padding-block-end:var(--space-3)}
.top::after{content:"";position:absolute;inset-inline:0;bottom:0;height:var(--space-3);background:var(--ticks);background-size:auto 6px,auto 12px;background-repeat:repeat-x;background-position:0 0;opacity:.55}
.brand{font-size:1.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;line-height:1}
.tag{font-size:1rem;color:var(--mute);text-transform:uppercase;letter-spacing:.08em}
.chips{display:flex;gap:var(--space-1);margin-inline-start:auto;align-self:center}
.chip{inline-size:var(--space-6);block-size:var(--space-8);border:1px solid var(--line);background:var(--c)}
/* cards become spec sheets: square, flat, label on a strip of tape */
.card,.room,.scan-prev,.hero3d,.out div,.tabs-list li,.flag,input,select,.btn,.scan-btn,code{border-radius:0}
.card{background:var(--primer);border:1px solid var(--line);box-shadow:none}
.card>h2:first-child{display:inline-block;background:var(--tape);padding:var(--space-1) var(--space-3);margin-block-end:var(--space-4);transform:rotate(-.6deg)}
.room{background:var(--primer)}
input,select{background:var(--in);border-color:var(--line)}
.btn{background:var(--acc);text-transform:uppercase;letter-spacing:.06em;font-size:1.0625rem}
.btn:hover{background:#174a94}
.btn.ghost{background:transparent;color:var(--ink);border:1px dashed var(--ink)}
.beta{border-radius:0;background:var(--tape);border:0;color:var(--ink)}
.hero3d,.scan-prev{background:var(--primer)}
.hero3d-o{border-radius:0;background:var(--primer);backdrop-filter:none;box-shadow:none;border:1px solid var(--line)}
.hero3d-o b{font-size:1.5rem}
.cant{background:transparent;border-style:dashed}
.flag{background:#fff3d6}
.range{font-size:2rem}
td b{font-size:1.25rem;font-weight:700}
.eg{color:var(--ink);background:var(--tape);padding:0 var(--space-2);font-size:.875rem}
.out div{background:var(--canvas)}
.out b{font-size:clamp(1.5rem,1.3rem + .8vw,2rem);font-weight:700}
a{color:var(--acc)}
/* calculator: asymmetric opener at desktop (5 / 7 of 12) */
.opener{display:grid;gap:var(--space-4);grid-template-columns:repeat(6,minmax(0,1fr))}
.opener>*{grid-column:1/-1;min-width:0}
@media (min-width:1024px){
  :root{--wrap-max:72rem}
  .opener{grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--space-8);align-items:end;margin-block:var(--space-8)}
  .opener .intro{grid-column:1/span 5;margin:0}
  .opener .hero3d{grid-column:6/span 7;margin:0}
  .desk{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--space-8);align-items:start}
  .desk>*{min-width:0}
  .desk .col-a{grid-column:1/span 7}.desk .col-b{grid-column:8/span 5}
  .g{max-width:53.75rem}
}
.intro p{font-size:1.125rem;color:var(--ink)}
/* guides: spec list instead of card grid */
.tabs-list{display:block;border-top:2px solid var(--ink)}
.tabs-list li{background:none;border:0;border-bottom:1px solid var(--line);padding:var(--space-3) 0;display:grid;grid-template-columns:minmax(8rem,1fr) 3fr;gap:var(--space-4)}
.tabs-list li br{display:none}
.tabs-list li b{font-family:var(--display);font-size:1.125rem;text-transform:uppercase}
.more{border-top:2px solid var(--ink);margin-block:var(--space-12) var(--space-6);padding-block-start:var(--space-4)}
.more h2{margin-block-start:0}
.more ul{padding-inline-start:var(--space-6)}
footer{border-top:1px solid var(--line);padding-block-start:var(--space-4)}
@media print{.chips,.top::after{display:none}}

/* ===== QA padding fix 2026-10-16: 44px check labels, list indent on token ===== */
.g ul,.g ol,ul.small,.src,.more ul{padding-inline-start:var(--space-6)}
@media (max-width:767px){
  .checks label{min-height:44px}
  .x{min-height:44px;min-width:44px}
}

/* ===== SEO4 2026-10-17: sourced pull quote on guides. Full hairline border, no side bar. ===== */
.g blockquote{margin:var(--space-6) 0;padding:var(--space-4) var(--space-6);background:var(--primer);border:1px solid var(--line);max-width:68ch}
.g blockquote p{margin:0 0 var(--space-2);font-size:1.125rem}
.g blockquote cite{display:block;font-style:normal;font-family:var(--display);font-size:.875rem;text-transform:uppercase;letter-spacing:.05em;color:var(--mute)}
.g .card ol{margin-block-end:0}
.g .formula code{display:block;padding:var(--space-3) var(--space-4);border:1px solid var(--line);overflow-wrap:anywhere}
.g .formula{margin-block-end:var(--space-2)}
.g .tabs-list.spec{max-width:68ch;padding-inline-start:0}
.g .big{margin:0 0 var(--space-2);font-family:var(--display);font-size:1.375rem;text-transform:uppercase;letter-spacing:.03em}
.g .big b{font-size:clamp(2.5rem,2rem + 2vw,3.5rem);line-height:1;margin-inline-end:var(--space-2)}
.g .card>p:last-child{margin-block-end:0}