/* Lumen — an architect's drawing set. Drafting film with a 5 mm grid, technical-pen navy,
   measurement blue for what the agent kept and the lines it measured, redline red for what needs a person.
   Depth comes only from sheets overlapping; nothing casts a shadow. Type: Barlow Condensed for lettering, Barlow for reading. */
:root {
  --film: #e6eae6;        /* page: drafting film */
  --sheet: #f7f8f5;       /* sheets */
  --well: #dde3e1;        /* image wells, tracks */
  --ink: #16324f;         /* technical pen */
  --ink-2: #455a6e;       /* secondary text, AA on film and sheet */
  --ink-3: #7d8d9b;       /* hairlines, "off" series */
  --rule: #b8c3c9;
  --grid: rgba(22, 50, 79, .055);
  --grid-major: rgba(22, 50, 79, .1);
  --measure: #22609f;     /* accepted fix, plumb lines, primary action */
  --measure-soft: rgba(34, 96, 159, .12);
  --redline: #b83a26;     /* needs review */
  --on-measure: #ffffff;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font: "Barlow", "Helvetica Neue", Arial, sans-serif;
  --text: clamp(1rem, .97rem + .15vw, 1.0625rem);
  --gutter: clamp(1rem, .4rem + 2.6vw, 2.75rem);
  --measure-w: 40rem;
  --ease: cubic-bezier(.16, 1, .3, 1);
  --r-sm: 7px;            /* buttons, tags, small images */
  --r-md: 12px;           /* photos, panels, tables */
  --r-lg: 18px;           /* sheets */
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  /* Dark = a blueprint: white linework on Prussian blue. */
  :root {
    --film: #0f2a45; --sheet: #133250; --well: #0b2239; --ink: #e4edf6; --ink-2: #a9bfd3; --ink-3: #7b97b1;
    --rule: #2f5274; --grid: rgba(228, 237, 246, .05); --grid-major: rgba(228, 237, 246, .09);
    --measure: #7cb7ff; --measure-soft: rgba(124, 183, 255, .14); --redline: #ff8f78; --on-measure: #0b2239;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scrollbar-color: var(--ink-3) var(--film); }
body {
  margin: 0; color: var(--ink); font: 400 var(--text)/1.55 var(--font); font-variant-numeric: tabular-nums;
  background-color: var(--film);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px), linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
  caret-color: var(--measure);
}
::selection { background: var(--measure); color: var(--on-measure); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--measure); text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { color: var(--ink); }
code { font: 500 .9em var(--display); background: var(--well); padding: .05em .35em; }
.muted { color: var(--ink-2); }
.skip { position: absolute; left: var(--gutter); top: -3rem; padding: .5rem .8rem; background: var(--ink); color: var(--sheet); z-index: 10; }
.skip:focus { top: .5rem; }
:focus-visible { outline: 2px solid var(--measure); outline-offset: 3px; }
.icon { display: inline-block; vertical-align: -.1em; margin-left: .3rem; }

h1, h2, h3, h4 { font-family: var(--display); letter-spacing: -.005em; line-height: 1.02; text-wrap: balance; }
.lede { max-width: var(--measure-w); font-size: 1.12rem; color: var(--ink-2); margin: 1.1rem 0 0; text-wrap: pretty; }

/* ---------- sheet index (top bar) ---------- */
.index {
  display: flex; flex-wrap: wrap; align-items: stretch; justify-content: space-between; gap: 0 2rem;
  max-width: 88rem; margin: 0 auto; padding: 0 var(--gutter);
}
.brand { display: flex; align-items: baseline; gap: .55rem; padding: 1.1rem 0; color: var(--ink); text-decoration: none; }
.brand-name { font: 800 1.75rem/1 var(--display); letter-spacing: .01em; }
.brand-by { font: 500 .95rem var(--display); color: var(--ink-2); }
.sheets { display: flex; flex-wrap: wrap; align-items: stretch; }
.sheet-tab {
  display: flex; align-items: center; gap: .55rem; padding: .9rem 1.1rem .8rem; color: var(--ink-2);
  font: 600 1.02rem var(--display); text-decoration: none; border-radius: var(--r-md) var(--r-md) 0 0;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.sheet-tab:hover { color: var(--ink); background: var(--sheet); }
.sheet-no { font-weight: 500; font-size: .82rem; color: var(--ink-2); }
.sheet-tab[aria-current="page"] { color: var(--ink); background: var(--sheet); box-shadow: inset 0 -3px 0 var(--measure); }
.sheet-tab[aria-current="page"] .sheet-no { color: var(--measure); }

main { max-width: 88rem; margin: 0 auto; padding: 0 var(--gutter) 4rem; }

/* ---------- a sheet: double drawing border, depth by overlap only ---------- */
.sheet, .cover {
  position: relative; background: var(--sheet); border: 1px solid var(--ink); border-radius: var(--r-lg);
}
.sheet::before, .cover::before {
  content: ""; position: absolute; inset: 5px; border: 1.5px solid var(--ink); pointer-events: none; opacity: .85;
  border-radius: calc(var(--r-lg) - 5px);
}

/* ---------- cover sheet ---------- */
.cover {
  display: grid; margin-top: .25rem;
  grid-template-columns: minmax(0, 2.9fr) minmax(17rem, 1.1fr); grid-template-areas: "elev text" "tb tb";
}
.elevation { grid-area: elev; position: relative; margin: 0; padding: 1.25rem 0 1.25rem 1.25rem; }
.elevation-img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; background: var(--well); border-radius: var(--r-md); }
.elevation::after {
  /* the drawing grid runs straight across the photo, admitted, not hidden */
  content: ""; position: absolute; inset: 1.25rem 0 auto 1.25rem; aspect-ratio: 3 / 2; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .13) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .13) 1px, transparent 1px);
  background-size: 5% 7.5%; border-radius: var(--r-md);
}
.plumb { position: absolute; left: 1.25rem; top: 1.25rem; width: calc(100% - 1.25rem); aspect-ratio: 3 / 2; overflow: visible; z-index: 1; }
.plumb .seg { stroke: #6fb1ff; stroke-width: 2.5; stroke-linecap: round; fill: none; }
.plumb .seg-halo { stroke: rgba(10, 30, 50, .55); stroke-width: 5; stroke-linecap: round; fill: none; }
.plumb .tick { fill: #6fb1ff; stroke: rgba(10, 30, 50, .6); stroke-width: 1; }
.plumb .leader, .plumb .leader-dot { stroke: #f7f8f5; stroke-width: 1.5; fill: none; filter: drop-shadow(0 0 1.5px rgba(10, 30, 50, .9)); }
.plumb.is-drawing .seg, .plumb.is-drawing .seg-halo { stroke-dasharray: 1; animation: draw 1.1s var(--ease) backwards; }
.plumb.is-drawing .tick { animation: appear .3s var(--ease) backwards; }
@keyframes draw { from { stroke-dashoffset: 1; } }
@keyframes appear { from { opacity: 0; } }
.callout {
  position: absolute; z-index: 2; left: 2.4rem; top: 2.4rem; margin: 0; padding: .55rem .75rem .6rem;
  background: var(--sheet); border: 1px solid var(--ink); border-radius: var(--r-sm); font: 500 .92rem/1.25 var(--display); color: var(--ink-2);
}
.callout b { color: var(--ink); font-weight: 700; }
.callout .callout-num { display: inline-block; margin-top: .15rem; font-size: 1.65rem; font-weight: 800; color: var(--measure); }
.elevation-cap { margin-top: .6rem; font: 500 .85rem var(--display); color: var(--ink-2); }

.cover-text { grid-area: text; display: flex; flex-direction: column; padding: clamp(1.5rem, 1rem + 2vw, 2.75rem) clamp(1.25rem, .8rem + 1.5vw, 2.25rem); }
.cover h1 { margin: 0; font-size: clamp(2.5rem, 1.5rem + 2.7vw, 4.4rem); font-weight: 800; line-height: .94; }
.cover .lede { font-size: 1.05rem; }
.wedge { list-style: none; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); margin: 1.75rem 0 0; padding: 0; border: 1px solid var(--ink); border-radius: var(--r-sm); overflow: hidden; }
.wedge li + li { border-left: 1px solid var(--ink); }
.wedge img { aspect-ratio: 3 / 2; object-fit: cover; width: 100%; }
.wedge span { display: block; padding: .2rem .35rem; font: 600 .78rem var(--display); color: var(--ink-2); border-top: 1px solid var(--ink); text-align: center; }
.cover-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .9rem 1.4rem; margin: auto 0 0; padding-top: 1.75rem; }

/* ---------- title block ---------- */
.title-block {
  grid-area: tb; display: grid; grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr)); margin: 0 5px 5px;
  border-top: 1.5px solid var(--ink); position: relative; z-index: 1; background: var(--sheet);
  border-radius: 0 0 calc(var(--r-lg) - 5px) calc(var(--r-lg) - 5px);
}
.title-block > div { padding: .55rem .9rem .65rem; border-left: 1px solid var(--ink); }
.title-block > div:first-child { border-left: 0; }
.title-block dt { font: 500 .74rem var(--display); color: var(--ink-2); }
.title-block dd { margin: .1rem 0 0; font: 600 1rem/1.25 var(--display); }

/* ---------- buttons and links ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .4rem; font: 600 1.02rem/1 var(--display); letter-spacing: .01em;
  padding: .75rem 1.15rem; color: var(--on-measure); background: var(--measure); border: 1.5px solid var(--measure); border-radius: var(--r-sm);
  cursor: pointer; text-decoration: none; transition: background-color .18s var(--ease), color .18s var(--ease);
}
.btn:hover:not(:disabled) { background: var(--ink); border-color: var(--ink); color: var(--sheet); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-quiet { color: var(--ink); background: transparent; border-color: var(--ink); }
.btn-quiet:hover:not(:disabled) { background: var(--well); color: var(--ink); border-color: var(--ink); }
.link-btn {
  font: 600 1rem var(--display); color: var(--measure); background: none; border: 0; padding: 0; cursor: pointer;
  text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .22em;
}
.link-btn:hover { color: var(--ink); }

/* ---------- intake ---------- */
.intake { padding-top: clamp(3rem, 2rem + 3vw, 5rem); }
.intake h2, .report-block h2 { margin: 0 0 1.25rem; font-size: clamp(1.8rem, 1.3rem + 1.6vw, 2.6rem); font-weight: 700; }
.intake-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(19rem, 1fr); gap: 1.25rem; align-items: stretch; }
.drop {
  position: relative; display: grid; justify-items: center; align-content: center; gap: .55rem; text-align: center; cursor: pointer;
  padding: clamp(2rem, 1.2rem + 3vw, 3.25rem) clamp(1.25rem, 1rem + 2vw, 2.5rem);
  background: var(--sheet); border: 1.5px dashed var(--ink-3); border-radius: var(--r-lg);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.drop-icon { color: var(--measure); background: var(--measure-soft); border-radius: 50%; padding: .65rem; width: 4rem; height: 4rem; margin-bottom: .25rem; transition: transform .25s var(--ease); }
.drop:hover .drop-icon, .drop.is-over .drop-icon { transform: translateY(-3px); }
.drop.is-over { transform: scale(1.005); }
.drop-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; margin-top: .6rem; }
.drop-actions > span.btn { pointer-events: none; }   /* the click falls through to the file input underneath */
.btn-small { padding: .6rem .95rem; font-size: .98rem; }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.drop:hover, .drop.is-over { border-color: var(--measure); background-color: color-mix(in oklab, var(--measure) 7%, var(--sheet)); }
.drop:focus-within { outline: 2px solid var(--measure); outline-offset: 3px; }
.drop-big { font: 700 clamp(1.45rem, 1.1rem + 1.3vw, 2.1rem)/1.1 var(--display); }
.drop-small { max-width: 30rem; font-size: .95rem; color: var(--ink-2); }

/* processing options: native checkboxes drawn as switches */
.options { margin: 0; padding: 1rem 1rem .9rem; background: var(--sheet); border: 1px solid var(--ink); border-radius: var(--r-lg); display: grid; gap: .15rem; }
.options legend { float: left; width: 100%; padding: .1rem .5rem .55rem; font: 700 1.2rem var(--display); }
.option { position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: .85rem; align-items: start; padding: .6rem .55rem; border-radius: var(--r-md); cursor: pointer; transition: background-color .15s var(--ease); }
.option:hover { background: var(--measure-soft); }
.option input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.option:has(input:focus-visible) { outline: 2px solid var(--measure); outline-offset: 1px; }
.switch { position: relative; width: 2.6rem; height: 1.5rem; margin-top: .1rem; border-radius: 999px; background: var(--rule); transition: background-color .2s var(--ease); }
.switch::after {
  content: ""; position: absolute; top: .2rem; left: .2rem; width: 1.1rem; height: 1.1rem; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 2px rgba(10, 30, 50, .35); transition: transform .22s var(--ease);
}
.option input:checked + .switch { background: var(--measure); }
.option input:checked + .switch::after { transform: translateX(1.1rem); }
.option-title { display: block; font: 600 1.05rem/1.25 var(--display); color: var(--ink); }
.option-help { display: block; font-size: .86rem; line-height: 1.4; color: var(--ink-2); }
.option.is-locked { cursor: default; }
.option.is-locked:hover { background: none; }
.option.is-locked input { cursor: default; }
.option.is-locked .switch { opacity: .55; }
.options-note { margin: .4rem .55rem 0; font-size: .82rem; color: var(--ink-2); }
.sample-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin: 1.1rem 0 0; font-size: .9rem; }
.sample-link {
  display: inline-flex; align-items: center; gap: .45rem; padding: .5rem .95rem .5rem .8rem; border: 1px solid var(--measure);
  border-radius: 999px; color: var(--measure); font: 600 1rem var(--display); text-decoration: none; transition: background-color .15s var(--ease);
}
.sample-link:hover { background: var(--measure-soft); color: var(--measure); }

.drawing-index { margin-top: 2.75rem; }
.drawing-index th[scope="row"] { font: 700 1.1rem var(--display); color: var(--ink); }
.drawing-index .sheet-cell { font: 600 .95rem var(--display); color: var(--measure); white-space: nowrap; }
.drawing-index td:last-child { white-space: nowrap; font: 600 .95rem var(--display); }

/* ---------- job progress ---------- */
.job { margin-top: 2.5rem; padding: 1rem 1.25rem; background: var(--sheet); border: 1px solid var(--ink); border-radius: var(--r-md); }
.job-line { display: flex; flex-wrap: wrap; gap: .75rem; align-items: baseline; }
.job-status { font: 700 1.15rem var(--display); color: var(--measure); }
.job-status::first-letter { text-transform: uppercase; }
.job-detail { color: var(--ink-2); }
.bar { height: 4px; background: var(--well); margin-top: .75rem; overflow: hidden; border-radius: 999px; }
.bar-fill { height: 100%; width: 100%; background: var(--measure); transform: scaleX(0); transform-origin: left; }
.job.is-busy .bar-fill { animation: sweep 1.4s var(--ease) infinite; }
@keyframes sweep { from { transform: translateX(-100%) scaleX(.4); } to { transform: translateX(110%) scaleX(.4); } }
.job-error { margin: .5rem 0 0; color: var(--redline); font-weight: 600; }

/* ---------- one sheet per room ---------- */
.results { display: grid; gap: 2.5rem; margin-top: 2rem; }
.set { padding: clamp(1.25rem, .8rem + 1.5vw, 2rem); }
.set-head { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .9rem; margin-bottom: 1.25rem; }
.set-title { margin: 0; font-size: 1.7rem; font-weight: 700; }
.set-reason { flex-basis: 100%; margin: 0; color: var(--redline); font-weight: 500; }
.set-reason:empty { display: none; }
.set-reason.is-calm { color: var(--ink-2); font-weight: 400; }
.set.is-review { border-color: var(--redline); }
.set.is-review::before { border-color: var(--redline); border-style: dashed; }
.set-body { display: grid; gap: 1.5rem 2.25rem; grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr); }
.set-frames { margin: .9rem 0 0; font: 500 .88rem var(--display); color: var(--ink-2); overflow-wrap: anywhere; }
.set-links { margin: 1rem 0 0; }

.chip {
  display: inline-flex; align-items: center; padding: .12rem .5rem; font: 600 .85rem/1.35 var(--display);
  border: 1px solid currentColor; border-radius: 999px; white-space: nowrap;
}
.chip-ok, .chip-accept, .chip-done, .chip-accepted { color: var(--measure); }
.chip-needs_review, .chip-review, .chip-drop { color: var(--redline); }
.chip-revert, .chip-skip, .chip-rejected, .chip-off { color: var(--ink-2); border-style: dashed; }

/* ---------- compare: a drawn section line you drag ---------- */
.compare { position: relative; aspect-ratio: 3 / 2; background: var(--well); margin: .95rem 0; --pos: 50%; border-radius: var(--r-md); }
.compare img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; border-radius: var(--r-md); }
.compare-after { clip-path: inset(0 0 0 var(--pos) round 0 var(--r-md) var(--r-md) 0); }
.compare::after {   /* chain line: long dash, dot */
  content: ""; position: absolute; top: 0; bottom: 0; left: var(--pos); width: 2px; margin-left: -1px; pointer-events: none;
  background: repeating-linear-gradient(to bottom, var(--measure) 0 18px, transparent 18px 24px, var(--measure) 24px 28px, transparent 28px 34px);
}
.cut {
  position: absolute; left: var(--pos); z-index: 2; width: 1.7rem; height: 1.7rem; margin-left: -.85rem; display: grid; place-items: center;
  border: 1.5px solid var(--measure); border-radius: 50%; background: var(--sheet); color: var(--measure);
  font: 700 .85rem/1 var(--display); pointer-events: none;
}
.cut-top { top: -.85rem; }
.cut-bottom { bottom: -.85rem; }
.compare-range { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: ew-resize; margin: 0; z-index: 3; }
.compare:focus-within { outline: 2px solid var(--measure); outline-offset: 4px; border-radius: var(--r-md); }
.compare-tag {
  position: absolute; bottom: .6rem; z-index: 1; padding: .12rem .5rem; font: 600 .82rem var(--display);
  background: var(--sheet); color: var(--ink); border: 1px solid var(--ink); border-radius: var(--r-sm); pointer-events: none;
}
.compare-tag-before { left: .6rem; }
.compare-tag-after { right: .6rem; }
.compare.no-after .compare-after, .compare.no-after::after, .compare.no-after .compare-tag-after, .compare.no-after .cut { display: none; }

/* ---------- numbers and revisions ---------- */
.metrics { display: grid; grid-template-columns: auto 1fr; margin: 0 0 1.75rem; border-top: 1.5px solid var(--ink); }
.metrics dt, .metrics dd { padding: .45rem 0; border-bottom: 1px solid var(--rule); }
.metrics dt { color: var(--ink-2); font-size: .92rem; padding-right: 1rem; }
.metrics dd { margin: 0; font: 700 1.02rem var(--display); text-align: right; }
.trace-title { margin: 0 0 .6rem; font-size: 1.15rem; font-weight: 700; }
.trace { list-style: none; margin: 0; padding: 0; counter-reset: rev; border-top: 1.5px solid var(--ink); }
.trace li {
  counter-increment: rev; display: grid; grid-template-columns: 1.6rem minmax(0, 1fr); column-gap: .6rem;
  padding: .55rem 0; border-bottom: 1px solid var(--rule); font-size: .88rem; color: var(--ink-2);
}
.trace li::before {
  content: counter(rev, upper-alpha); grid-row: span 3; font: 700 .9rem/1.5rem var(--display); text-align: center;
  color: var(--ink); border: 1px solid var(--ink); border-radius: 6px; height: 1.5rem;
}
.trace li.is-skip, .trace li.is-revert, .trace li.is-off { border-bottom-style: dashed; }
.trace li.is-skip::before, .trace li.is-revert::before, .trace li.is-off::before { border-style: dashed; color: var(--ink-2); border-color: var(--ink-3); }
.trace li.is-review::before, .trace li.is-drop::before { color: var(--redline); border-color: var(--redline); }
.trace li.is-accept::before, .trace li.is-done::before, .trace li.is-accepted::before { color: var(--measure); border-color: var(--measure); }
.trace-head { display: flex; flex-wrap: wrap; gap: .3rem .5rem; align-items: center; color: var(--ink); }
.trace-rule { font: 600 1rem var(--display); }
.trace-nums { margin: .2rem 0 0; overflow-wrap: anywhere; }

.review { margin-top: 1.25rem; padding: 1rem 1.1rem; border-radius: var(--r-md); border: 1.5px dashed var(--redline); background: color-mix(in oklab, var(--redline) 6%, var(--sheet)); }
.review.is-done { border: 1px solid var(--measure); background: var(--measure-soft); padding: .7rem 1rem; }
.review-title { margin: 0 0 .75rem; font: 700 1.1rem var(--display); color: var(--redline); }
.review-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.review-msg { margin: .5rem 0 0; font-size: .88rem; color: var(--ink-2); }
.review.is-done .review-msg { margin: 0; }
.review-msg:empty { display: none; }
.review-pick { font: 500 .95rem var(--display); padding: .6rem; border: 1.5px solid var(--ink); border-radius: var(--r-sm); background: var(--sheet); color: var(--ink); max-width: 14rem; }

.grouping { margin-top: 2.5rem; font-size: .92rem; color: var(--ink-2); }
.grouping summary { cursor: pointer; font: 600 1.05rem var(--display); color: var(--ink); }

/* ---------- report ---------- */
.report-head { padding: clamp(2.25rem, 1.2rem + 4vw, 4.25rem) 0 .5rem; }
.report-head h1 { margin: 0; font-size: clamp(3rem, 1.8rem + 4vw, 5.5rem); font-weight: 800; line-height: .9; }
.report-block { padding-top: clamp(2.5rem, 1.8rem + 2.5vw, 4rem); scroll-margin-top: 1rem; }
.report-block > p { max-width: var(--measure-w); }
.finding { max-width: 46rem; font-size: 1.2rem; line-height: 1.45; margin: 0 0 1.5rem; text-wrap: pretty; }
.finding b { font-weight: 700; }
.source { font: 500 .85rem var(--display); color: var(--ink-2); max-width: 46rem; }

.room-sheet { display: grid; grid-template-columns: minmax(0, 2.2fr) minmax(16rem, 1fr); gap: 1.25rem 2rem; padding: clamp(1.25rem, .8rem + 1.5vw, 2rem); }
/* a set laid on a table: each later sheet overlaps the one before and steps right */
.room-sheet:nth-of-type(2) { margin: -1rem 0 0 1rem; }
.room-sheet:nth-of-type(3) { margin: -1rem 0 0 2rem; }
.room-sheet > .sheet-block, .ghost-sheet > .sheet-block { grid-area: auto; grid-column: 1 / -1; margin: .25rem -5px -5px; border: 0; border-top: 1.5px solid var(--ink); background: transparent; }
.ghost-sheet > p:last-of-type { margin-bottom: 1rem; }
.ghost-sheet > .sheet-block { margin: auto calc(5px - 1.25rem) calc(5px - 1.25rem); grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr)); }
.room-side .trace { margin-top: -.4rem; }
.room-sheet h3 { margin: 0; font-size: 1.9rem; font-weight: 800; }
.room-side { display: flex; flex-direction: column; gap: 1rem; }
.room-side .metrics { margin: 0; }
.window-pair { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin: 0; }
.window-pair figure { margin: 0; }
.window-pair img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; border: 1px solid var(--ink); border-radius: var(--r-sm); background: var(--well); }
.window-pair figcaption { margin-top: .3rem; font: 500 .82rem/1.3 var(--display); color: var(--ink-2); }
.window-pair b { color: var(--ink); }

.ghost-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3rem 0; margin: 1.75rem 0 3.25rem; }
.ghost-sheet { display: flex; flex-direction: column; padding: 1.1rem 1.25rem 1.25rem; }
.ghost-sheet:nth-child(even) { margin: 1rem 0 -1rem -1rem; }   /* each pair overlaps, stepped down and left */
.ghost-sheet h3 { margin: 0; font-size: 1.35rem; font-weight: 700; }
.ghost-sheet .compare { margin: 1.1rem 0 1rem; }
.ghost-sheet p { margin: 0; font-size: .92rem; color: var(--ink-2); }
.ghost-sheet p b { color: var(--ink); font: 700 1.05rem var(--display); }
.ghost-sheet.is-review { border-color: var(--redline); }
.ghost-sheet.is-review::before { border-color: var(--redline); border-style: dashed; }
.ghost-sheet .redline-note { margin-top: .5rem; color: var(--redline); font-weight: 600; }

.table-wrap { overflow-x: auto; }
table { border-collapse: separate; border-spacing: 0; width: 100%; font-size: .94rem; background: var(--sheet); border: 1px solid var(--ink); border-radius: var(--r-md); overflow: hidden; }
caption { text-align: left; color: var(--ink-2); font: 500 .9rem var(--display); padding-bottom: .5rem; }
th, td { padding: .6rem .9rem; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
thead th { font: 600 .9rem var(--display); color: var(--ink-2); border-bottom: 1.5px solid var(--ink); }
tbody tr:last-child > * { border-bottom: 0; }
td.num, th.num { text-align: right; }
.status-ok { color: var(--measure); font-weight: 600; }
.status-review { color: var(--redline); font-weight: 600; }

.chart { max-width: 48rem; margin: 0 0 1rem; padding: 1.25rem 1.25rem .75rem; }
.chart svg { width: 100%; height: auto; overflow: visible; }
.chart .grid { stroke: var(--rule); stroke-width: 1; }
.chart .axis-label, .chart .cat-label { fill: var(--ink-2); font: 500 13px var(--display); }
.chart .cat-label { fill: var(--ink); font-weight: 600; }
.chart .link { stroke: var(--ink-3); stroke-width: 2; }
.chart .dot-off { fill: var(--sheet); stroke: var(--ink-2); stroke-width: 2; }
.chart .dot-on { fill: var(--measure); stroke: var(--sheet); stroke-width: 2; }
.chart .row-hl { fill: var(--measure-soft); opacity: 0; }
.chart .row:hover .row-hl, .chart .row:focus .row-hl { opacity: 1; }
.chart .row:focus { outline: none; }
.legend { display: flex; flex-wrap: wrap; gap: 1.25rem; margin: 0 0 .9rem; font: 500 .92rem var(--display); color: var(--ink-2); padding: 0; list-style: none; }
.legend li { display: inline-flex; align-items: center; gap: .45rem; }
.swatch { width: .8rem; height: .8rem; border-radius: 50%; display: inline-block; }
.swatch-off { background: var(--sheet); border: 2px solid var(--ink-2); }
.swatch-on { background: var(--measure); }
.tip {
  position: fixed; z-index: 20; pointer-events: none; padding: .5rem .7rem; font: 500 .9rem var(--display);
  background: var(--ink); color: var(--sheet); max-width: 18rem; border-radius: var(--r-sm);
}
.notes { max-width: 46rem; padding-left: 1.4rem; margin: 0; }
.notes li { margin-bottom: .55rem; padding-left: .25rem; }
.notes li::marker { font: 700 1rem var(--display); color: var(--measure); }
.clear-runs { margin-top: .9rem; }

/* ---------- colophon ---------- */
.colophon { max-width: 88rem; margin: 0 auto; padding: 0 var(--gutter) 2.5rem; }
.title-block-foot { margin: 0; border: 1px solid var(--ink); border-radius: var(--r-lg); overflow: hidden; }
.title-block-foot .wide { grid-column: span 2; }

/* ---------- smaller screens ---------- */
@media (max-width: 66rem) {
  .cover { grid-template-columns: minmax(0, 1fr); grid-template-areas: "elev" "text" "tb"; }
  .elevation { padding: 1.1rem 1.1rem 0; }
  .elevation::after { inset: 1.1rem 1.1rem auto 1.1rem; }
  .plumb { left: 1.1rem; top: 1.1rem; width: calc(100% - 2.2rem); }
  .room-sheet { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 52rem) {
  .intake-grid { grid-template-columns: minmax(0, 1fr); }
  .set-body, .ghost-grid { grid-template-columns: minmax(0, 1fr); }
  .plumb .seg { stroke-width: 1.5; }
  .plumb .seg-halo { stroke-width: 3; }
  .plumb .tick { r: 2.5px; }
  .callout { left: 1.5rem; top: 1.5rem; font-size: .8rem; padding: .3rem .45rem; }
  .room-sheet:nth-of-type(n), .ghost-sheet:nth-child(n) { margin: -1rem 0 0; }
  .ghost-sheet:first-child { margin-top: 0; }
  .ghost-grid { gap: 0; }
  .callout .callout-num { font-size: 1.05rem; margin-top: 0; }
  .title-block { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .title-block > div { border-left: 0; border-top: 1px solid var(--ink); }
  .title-block > div:nth-child(even) { border-left: 1px solid var(--ink); }
  .title-block > div:first-child, .title-block > div:nth-child(2) { border-top: 0; }
  .title-block-foot .wide { grid-column: 1 / -1; border-left: 0; }
  .sheet-tab { padding: .7rem .75rem; }
  .brand { padding: .8rem 0 .2rem; }
  .drawing-index th, .drawing-index td { padding: .55rem .5rem; }
  .drawing-index td:last-child { white-space: normal; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .plumb .seg, .plumb .seg-halo { stroke-dashoffset: 0 !important; }
  .plumb .tick { opacity: 1 !important; }
}