@font-face {
  font-family: "Archivo Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  src: url("assets/fonts/archivo-latin-wdth-normal.woff2") format("woff2-variations");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url("assets/fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("assets/fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2");
}

:root {
  --ink: #11171b;
  --ink-soft: #232c31;
  --paper: #f3f0e8;
  --paper-deep: #ded9cd;
  --chalk: #f8f7f2;
  --signal: #e6ff45;
  --signal-dark: #b7d400;
  --line: rgba(248, 247, 242, 0.2);
  --line-dark: rgba(17, 23, 27, 0.18);
  --muted: #9da7aa;
  --max: 1440px;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --header-h: 82px;
  --mono: "IBM Plex Mono", monospace;
  --sans: "Archivo Variable", "Arial Narrow", sans-serif;
}

* { box-sizing: border-box; }

html {
  background: var(--ink);
  color-scheme: dark;
  scroll-behavior: smooth;
}

html[data-theme="paper"] {
  background: var(--paper);
  color-scheme: light;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: clip;
}

html[data-theme="paper"] body { background: var(--paper); color: var(--ink); }

img, svg, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

html[data-theme="paper"] :focus-visible { outline-color: #557000; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 1rem;
  left: 1rem;
  padding: .75rem 1rem;
  background: var(--signal);
  color: var(--ink);
  transform: translateY(-160%);
  transition: transform .2s ease;
}

.skip-link:focus { transform: translateY(0); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
  line-height: 1.3;
  text-transform: uppercase;
}

.eyebrow::before { content: ""; width: 1.9rem; height: 1px; background: currentColor; }

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-weight: 520; line-height: .95; letter-spacing: -.045em; }
h1 { font-size: clamp(3.2rem, 8.2vw, 8.6rem); }
h2 { font-size: clamp(2.5rem, 5.4vw, 5.8rem); }
h3 { font-size: clamp(1.5rem, 2.6vw, 2.5rem); }
em { color: var(--signal); font-style: normal; }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 0;
  padding: .85rem 1.25rem;
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .06em;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}

.button:hover { transform: translateY(-2px); }
.button--primary { background: var(--signal); color: var(--ink); }
.button--primary:hover { background: #f0ff83; }
.button--outline { border-color: currentColor; background: transparent; color: inherit; }
.button--outline:hover, .button--ghost:hover { background: currentColor; color: var(--paper); }
.button--ghost { border-color: var(--line-dark); background: transparent; color: var(--ink); }

.text-link {
  display: inline-flex;
  gap: .65rem;
  align-items: center;
  min-height: 44px;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  text-underline-offset: .35rem;
}

/* Header */
.site-header {
  position: fixed;
  z-index: 40;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease;
}

.site-header.is-scrolled { background: rgba(17, 23, 27, .88); border-color: var(--line); backdrop-filter: blur(18px); }
html[data-theme="paper"] .site-header { color: var(--ink); }
html[data-theme="paper"] .site-header.is-scrolled { background: rgba(243, 240, 232, .9); border-color: var(--line-dark); }

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  min-height: 44px;
  font-size: .8rem;
  font-weight: 620;
  letter-spacing: .04em;
  text-decoration: none;
  text-transform: uppercase;
}

.wordmark__mark { position: relative; width: 34px; height: 22px; }
.wordmark__mark i { position: absolute; width: 20px; height: 2px; background: var(--signal); transform-origin: left center; }
.wordmark__mark i:nth-child(1) { left: 1px; top: 13px; transform: rotate(-38deg); }
.wordmark__mark i:nth-child(2) { left: 16px; top: 1px; transform: rotate(38deg); }
.wordmark__mark i:nth-child(3) { left: 16px; top: 13px; width: 17px; }

.site-nav, .site-nav__links { display: flex; align-items: center; }
.site-nav { gap: clamp(1.5rem, 3vw, 3.5rem); }
.site-nav__links { gap: clamp(1.25rem, 2.5vw, 2.75rem); }
.site-nav__links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav__links a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 6px; height: 1px; background: var(--signal); transition: right .2s ease; }
.site-nav__links a:hover::after, .site-nav__links a[aria-current="page"]::after { right: 0; }
.motion-toggle, .menu-toggle { color: inherit; border: 0; background: transparent; cursor: pointer; }
.motion-toggle { display: flex; align-items: center; gap: .7rem; min-height: 44px; padding: 0; }
.motion-toggle__status { font-family: var(--mono); font-size: .62rem; letter-spacing: .06em; text-transform: uppercase; }
.motion-toggle__rail { width: 28px; height: 14px; padding: 2px; border: 1px solid currentColor; }
.motion-toggle__rail i { display: block; width: 8px; height: 8px; background: var(--signal); transition: transform .2s ease; }
.motion-toggle[aria-pressed="true"] .motion-toggle__rail i { transform: translateX(14px); }
.menu-toggle { display: none; min-width: 48px; min-height: 48px; }

/* Cinematic home */
.roof-experience { position: relative; height: 620vh; min-height: 4200px; background: #0b0f12; }
.roof-stage { position: sticky; top: 0; height: 100vh; min-height: 640px; overflow: hidden; background: #0b0f12; }
.roof-stage__poster, .roof-stage__canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.roof-stage__poster img { width: 100%; height: 100%; object-fit: cover; }
.roof-stage__poster { transition: opacity .35s ease; }
.roof-stage__poster.is-loaded { opacity: 0; }
.roof-stage__canvas { max-width: none; }
.roof-stage__veil { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5, 8, 10, .83) 0%, rgba(5, 8, 10, .45) 42%, rgba(5, 8, 10, .06) 72%), linear-gradient(0deg, rgba(5,8,10,.68), transparent 30%); }
.blueprint-field { position: absolute; inset: 0; opacity: .35; pointer-events: none; }
.blueprint-field i { position: absolute; display: block; border-color: rgba(230,255,69,.45); }
.blueprint-field__horizon { left: 6vw; right: 6vw; top: 73%; border-top: 1px solid; }
.blueprint-field__pitch { right: 8vw; top: 18%; width: 23vw; height: 23vw; border-left: 1px solid; transform: rotate(45deg); }
.blueprint-field__measure { right: 7vw; top: 12%; height: 62%; border-left: 1px dashed; }
.roof-stage__content { position: relative; z-index: 2; width: 100%; height: 100%; max-width: var(--max); margin: auto; padding: calc(var(--header-h) + 2rem) var(--gutter) 2rem; }
.hero-intro { position: absolute; left: var(--gutter); top: 18vh; width: min(780px, 62vw); transition: opacity .45s ease, transform .45s ease; }
.hero-intro h1 { margin: 1.5rem 0 1.4rem; font-size: clamp(3.5rem, 7vw, 7.5rem); }
.hero-intro h1 em { display: block; }
.hero-intro > p { max-width: 600px; color: #d0d5d5; font-size: clamp(1rem, 1.35vw, 1.25rem); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem 1.5rem; margin-top: 2.2rem; }
.chapter-stack { position: absolute; left: var(--gutter); top: 50%; width: min(630px, 50vw); transform: translateY(-38%); }
.sequence-chapter { position: absolute; left: 0; top: 0; opacity: 0; transform: translateY(25px); pointer-events: none; transition: opacity .35s ease, transform .45s cubic-bezier(.2,.8,.2,1); }
.sequence-chapter[data-active="true"] { opacity: 1; transform: translateY(0); }
.sequence-chapter > span { font-family: var(--mono); font-size: .7rem; letter-spacing: .1em; color: var(--signal); text-transform: uppercase; }
.sequence-chapter h2 { margin: 1rem 0; font-size: clamp(3rem, 6vw, 6.8rem); }
.sequence-chapter p { max-width: 530px; color: #d0d5d5; font-size: clamp(1rem, 1.35vw, 1.22rem); }
.roof-experience[data-chapter="0"] .chapter-stack { opacity: 0; }
.roof-experience:not([data-chapter="0"]) .hero-intro { opacity: 0; transform: translateY(-20px); pointer-events: none; }
.sequence-status { position: absolute; left: var(--gutter); right: var(--gutter); bottom: 2rem; display: grid; grid-template-columns: auto minmax(160px, 380px) auto; gap: 1rem; align-items: center; font-family: var(--mono); font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; }
.sequence-status__track { height: 1px; background: rgba(255,255,255,.3); overflow: hidden; }
.sequence-status__track i { display: block; width: 100%; height: 100%; background: var(--signal); transform: scaleX(0); transform-origin: left; }
.sequence-status__hint { color: var(--muted); }
.sequence-skip { position: absolute; right: var(--gutter); top: calc(var(--header-h) + 1rem); font-family: var(--mono); font-size: .62rem; letter-spacing: .08em; text-underline-offset: .3rem; text-transform: uppercase; }
.reduced-roof-story { display: none; }

.evidence-field, .assembly-preview, .conversion-field, .failure-path, .project-index, .system-comparison, .after-request { padding: clamp(6rem, 11vw, 11rem) var(--gutter); }
.evidence-field { position: relative; background: var(--paper); color: var(--ink); }
.section-heading { max-width: 930px; }
.section-heading--offset { margin-left: 14vw; }
.section-heading h2 { margin: 1.3rem 0; }
.section-heading p { max-width: 570px; font-size: 1.08rem; }
.evidence-route { display: grid; grid-template-columns: repeat(3, 1fr); max-width: var(--max); margin: 6rem auto 0; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.evidence-route article { position: relative; min-height: 380px; padding: 2rem; border-right: 1px solid var(--line-dark); }
.evidence-route article:last-child { border-right: 0; }
.evidence-route__number { font-family: var(--mono); font-size: .66rem; }
.evidence-route h3 { margin: 2.4rem 0 1rem; }
.evidence-route p { max-width: 340px; }
.evidence-route__glyph { position: relative; height: 100px; margin-top: 2.5rem; }
.evidence-route__glyph i { position: absolute; display: block; border-color: var(--ink); }
.evidence-route__glyph--edge i:first-child { left: 10%; top: 55%; width: 58%; border-top: 2px solid; transform: rotate(-18deg); }
.evidence-route__glyph--edge i:last-child { left: 51%; top: 15%; height: 70%; border-left: 1px dashed; }
.evidence-route__glyph--path i { left: calc(20% + var(--i, 0px)); top: calc(18% + var(--i, 0px)); width: 48%; height: 48%; border-left: 1px solid; border-bottom: 1px solid; transform: skewX(-35deg); }
.evidence-route__glyph--path i:nth-child(2) { --i: 12px; opacity: .55; }
.evidence-route__glyph--path i:nth-child(3) { --i: 24px; opacity: .25; }
.evidence-route__glyph--signal i { left: 25%; top: 10%; width: 70px; height: 70px; border: 1px solid; border-radius: 50%; box-shadow: 0 0 0 14px var(--paper), 0 0 0 15px rgba(17,23,27,.35), 0 0 0 30px var(--paper), 0 0 0 31px rgba(17,23,27,.15); }

.assembly-preview { min-height: 780px; display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: 7vw; background: #172026; }
.assembly-preview__copy h2 { margin: 1.4rem 0; }
.assembly-preview__copy p { max-width: 560px; color: #bec6c7; }
.assembly-preview__copy .button { margin-top: 1.5rem; }
.assembly-preview__diagram { position: relative; height: 500px; perspective: 900px; }
.assembly-slice { position: absolute; left: 7%; right: 5%; height: 170px; border: 1px solid rgba(248,247,242,.6); transform: rotateX(62deg) rotateZ(-10deg); transform-style: preserve-3d; box-shadow: -1rem 1.5rem 2rem rgba(0,0,0,.22); }
.assembly-slice span { position: absolute; right: 0; top: -1.5rem; font-family: var(--mono); font-size: .6rem; letter-spacing: .08em; text-transform: uppercase; }
.assembly-slice--shingle { top: 0; background: repeating-linear-gradient(90deg,#667078 0 70px,#3e494f 71px 73px); }
.assembly-slice--membrane { top: 92px; background: #b6bfbd; color: var(--ink); }
.assembly-slice--barrier { top: 184px; background: var(--signal); color: var(--ink); }
.assembly-slice--deck { top: 276px; background: repeating-linear-gradient(90deg,#9b7658 0 105px,#664b39 106px 109px); }
.assembly-preview__axis { position: absolute; right: 0; top: 8%; height: 78%; border-left: 1px dashed var(--signal); }

.conversion-field { position: relative; overflow: hidden; text-align: center; background: #090d0f; }
.conversion-field h2 { max-width: 980px; margin: 1.2rem auto; }
.conversion-field p { max-width: 590px; margin: 0 auto 2rem; color: #bdc5c7; }
.conversion-field__signal { position: absolute; inset: 50% auto auto 50%; width: min(70vw, 900px); aspect-ratio: 1; transform: translate(-50%,-50%); opacity: .1; }
.conversion-field__signal i { position: absolute; inset: calc(var(--n) * 12%); border: 1px solid var(--signal); border-radius: 50%; }
.conversion-field__signal i:nth-child(1) { --n: 0; }.conversion-field__signal i:nth-child(2) { --n: 1; }.conversion-field__signal i:nth-child(3) { --n: 2; }
.conversion-field > :not(.conversion-field__signal) { position: relative; }
.conversion-field--paper { background: var(--paper-deep); color: var(--ink); }
.conversion-field--paper p { color: var(--ink-soft); }

/* Systems */
.page-hero { min-height: 780px; display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: 5vw; padding: calc(var(--header-h) + 5rem) var(--gutter) 6rem; background: #10171b; }
.page-hero__copy h1 { margin: 1.2rem 0; font-size: clamp(3.7rem, 7.6vw, 8.1rem); }
.page-hero__copy p { max-width: 600px; color: #bdc5c7; font-size: 1.1rem; }
.roof-blueprint { color: var(--signal); }
.roof-blueprint svg { width: 100%; overflow: visible; }
.roof-blueprint path { fill: none; stroke: currentColor; stroke-width: 1; opacity: .42; }
.roof-blueprint .roof-blueprint__accent { stroke-width: 3; opacity: 1; }
.roof-blueprint circle { fill: var(--signal); }
.roof-blueprint span { display: block; margin-top: 1rem; font-family: var(--mono); font-size: .65rem; letter-spacing: .1em; text-align: right; text-transform: uppercase; }
.system-bench { padding: clamp(6rem,10vw,10rem) var(--gutter); background: var(--paper); color: var(--ink); }
.system-bench__header { display: flex; justify-content: space-between; align-items: end; gap: 4rem; max-width: var(--max); margin: auto; }
.system-bench__header h2 { margin: 1rem 0 0; }
.system-bench__header > p { max-width: 470px; }
.system-bench__workspace { display: grid; grid-template-columns: 240px minmax(350px,1fr) minmax(270px,390px); gap: clamp(1.5rem,3vw,4rem); align-items: center; max-width: var(--max); margin: 6rem auto 0; }
.layer-controls { border-top: 1px solid var(--line-dark); }
.layer-controls button { width: 100%; min-height: 62px; display: grid; grid-template-columns: 36px 1fr; align-items: center; text-align: left; border: 0; border-bottom: 1px solid var(--line-dark); background: transparent; color: inherit; cursor: pointer; }
.layer-controls button span { font-family: var(--mono); font-size: .65rem; }
.layer-controls button b { font-size: .92rem; font-weight: 540; }
.layer-controls button[aria-pressed="true"] { background: var(--ink); color: var(--signal); padding-left: .8rem; }
.layer-model { position: relative; height: 570px; perspective: 950px; }
.layer-model__grid { position: absolute; inset: 4%; background-image: linear-gradient(var(--line-dark) 1px, transparent 1px),linear-gradient(90deg,var(--line-dark) 1px,transparent 1px); background-size: 34px 34px; mask-image: linear-gradient(transparent,black 20%,black 80%,transparent); }
.layer-plane { position: absolute; left: 12%; right: 10%; height: 150px; border: 1px solid var(--ink); cursor: pointer; transform: rotateX(61deg) rotateZ(-13deg); box-shadow: -18px 22px 25px rgba(17,23,27,.12); transition: translate .25s ease, filter .25s ease, border-color .25s ease; }
.layer-plane:hover, .layer-plane[data-active="true"] { translate: -12px -10px; border-color: #627400; filter: brightness(1.15); }
.layer-plane--surface { top: 0; z-index: 5; background: repeating-linear-gradient(90deg,#647078 0 52px,#323c42 53px 55px); }
.layer-plane--underlayment { top: 80px; z-index: 4; background: #a9b2ae; }
.layer-plane--barrier { top: 160px; z-index: 3; background: var(--signal); }
.layer-plane--deck { top: 240px; z-index: 2; background: repeating-linear-gradient(90deg,#9b7759 0 80px,#6f513b 81px 84px); }
.layer-plane--ventilation { top: 320px; z-index: 1; background: repeating-linear-gradient(90deg,#1f282d 0 32px,#aeb8b5 33px 37px); }
.layer-model__axis { position: absolute; right: 1%; top: 5%; bottom: 8%; display: flex; flex-direction: column; align-items: center; justify-content: space-between; font-family: var(--mono); font-size: .57rem; letter-spacing: .07em; text-transform: uppercase; writing-mode: vertical-rl; }
.layer-model__axis i { flex: 1; margin: .8rem; border-left: 1px dashed var(--ink); }
.layer-readout { min-height: 390px; padding: 2rem; border-left: 1px solid var(--ink); }
.layer-readout h3 { margin: 1.2rem 0; }
.layer-readout p { font-size: 1.05rem; }
.layer-readout dl { margin: 2rem 0; padding-top: 1rem; border-top: 1px solid var(--line-dark); }
.layer-readout dt { font-family: var(--mono); font-size: .63rem; letter-spacing: .08em; text-transform: uppercase; }
.layer-readout dd { margin: .6rem 0 0; }
.layer-readout a { font-family: var(--mono); font-size: .68rem; letter-spacing: .05em; text-transform: uppercase; }
.failure-path { background: #152027; }
.failure-path__steps { display: grid; grid-template-columns: repeat(4,1fr); margin: 5rem 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.failure-path__steps li { min-height: 260px; padding: 1.8rem; border-right: 1px solid var(--line); }
.failure-path__steps li:last-child { border-right: 0; }
.failure-path__steps span { font-family: var(--mono); color: var(--signal); font-size: .68rem; }
.failure-path__steps b { display: block; margin: 4rem 0 1rem; font-size: 1.4rem; }
.failure-path__steps p { color: #bdc5c7; }
.project-index { display: grid; grid-template-columns: .7fr 1.3fr; gap: 7vw; background: var(--paper); color: var(--ink); }
.project-index__header { position: sticky; top: calc(var(--header-h) + 2rem); align-self: start; }
.project-index__header h2 { margin: 1.2rem 0; }
.project-index__list { border-top: 1px solid var(--line-dark); }
.project-index details { border-bottom: 1px solid var(--line-dark); }
.project-index summary { min-height: 86px; display: grid; grid-template-columns: 90px 1fr auto; gap: 1rem; align-items: center; cursor: pointer; list-style: none; }
.project-index summary::-webkit-details-marker { display: none; }
.project-index summary span, .project-index summary em { font-family: var(--mono); font-size: .62rem; letter-spacing: .07em; text-transform: uppercase; }
.project-index summary em { color: #5e676b; }
.project-index summary b { font-size: 1.1rem; }
.project-study { padding: 0 0 2.5rem 106px; }
.project-study p { max-width: 700px; }
.project-study strong { display: inline-block; min-width: 80px; font-family: var(--mono); font-size: .65rem; letter-spacing: .07em; text-transform: uppercase; }
.project-study a { font-family: var(--mono); font-size: .67rem; text-transform: uppercase; }
.system-comparison { background: #10171b; }
.system-comparison header { max-width: 900px; }
.system-comparison h2 { margin: 1.2rem 0 3rem; }
.table-wrap { overflow-x: auto; }
table { width: 100%; min-width: 820px; border-collapse: collapse; }
th, td { padding: 1.3rem 1rem; text-align: left; border-bottom: 1px solid var(--line); }
thead th { font-family: var(--mono); color: var(--muted); font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; }
tbody th { color: var(--signal); font-weight: 520; }

/* Inspection */
.inspection-shell { min-height: 100vh; padding: calc(var(--header-h) + 5rem) var(--gutter) 7rem; }
.inspection-intro { max-width: 1100px; }
.inspection-intro h1 { margin: 1.2rem 0; color: var(--ink); }
.inspection-intro h1 em { color: #657500; }
.inspection-intro > p { max-width: 620px; font-size: 1.1rem; }
.inspection-intro__note { max-width: 660px; display: flex; gap: .9rem; align-items: flex-start; margin-top: 2rem; padding: 1rem; border: 1px solid var(--line-dark); }
.inspection-intro__note > span { flex: 0 0 25px; height: 25px; display: grid; place-items: center; border: 1px solid; border-radius: 50%; font-family: var(--mono); font-size: .7rem; }
.inspection-intro__note p { margin: 0; font-size: .85rem; }
.inspection-workspace { display: grid; grid-template-columns: 230px minmax(0,850px); gap: clamp(2rem,6vw,7rem); margin-top: 5rem; }
.form-progress ol { margin: 0; padding: 0; list-style: none; }
.form-progress li { display: grid; grid-template-columns: 42px 1fr; align-items: center; min-height: 56px; opacity: .42; }
.form-progress li[aria-current="step"], .form-progress li[data-complete="true"] { opacity: 1; }
.form-progress li span { font-family: var(--mono); font-size: .65rem; }
.form-progress li b { font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; }
.form-progress__line { display: block; height: 2px; margin-top: 1.5rem; background: var(--line-dark); }
.form-progress__line i { display: block; height: 100%; width: 100%; background: #657500; transform: scaleX(.05); transform-origin: left; transition: transform .3s ease; }
.inspection-form, .form-success { min-width: 0; }
.form-step { margin: 0; padding: 0; border: 0; }
.form-step > legend { display: block; width: 100%; margin-bottom: .8rem; font-size: clamp(2rem,4vw,4.2rem); font-weight: 520; line-height: 1; letter-spacing: -.04em; }
.form-step > legend span { display: block; margin-bottom: .8rem; font-family: var(--mono); font-size: .65rem; letter-spacing: .08em; text-transform: uppercase; }
.form-step__intro { color: #50595d; }
.choice-grid, .condition-grid { display: grid; gap: 1rem; margin: 2.5rem 0; }
.choice-grid { grid-template-columns: repeat(2,1fr); }
.condition-grid { grid-template-columns: repeat(3,1fr); }
.choice-card, .condition-card { position: relative; min-height: 150px; display: flex; flex-direction: column; justify-content: flex-end; gap: .35rem; padding: 1.2rem; border: 1px solid var(--line-dark); cursor: pointer; }
.choice-card:has(input:checked), .condition-card:has(input:checked) { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.choice-card input, .condition-card input { position: absolute; opacity: 0; }
.choice-card b { font-size: 1.05rem; }
.choice-card small { color: #687175; }
.choice-card:has(input:checked) small { color: #bec6c7; }
.choice-card__icon { position: absolute; top: 1.2rem; left: 1.2rem; width: 42px; height: 32px; border: 1px solid currentColor; transform: skewY(-12deg); }
.choice-card__icon--home::before { content: ""; position: absolute; left: 6px; top: -10px; width: 27px; height: 27px; border-left: 1px solid; border-top: 1px solid; transform: rotate(45deg); }
.choice-card__icon--commercial { background: repeating-linear-gradient(90deg,transparent 0 8px,currentColor 9px 10px); }
.condition-card { min-height: 115px; justify-content: space-between; }
.condition-card i { width: 28px; height: 28px; border: 1px solid currentColor; border-radius: 50% 50% 50% 0; transform: rotate(-45deg); }
.condition-card span { font-weight: 540; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: flex; flex-direction: column; gap: .55rem; margin: 1.2rem 0; }
.field > span, .field > legend { font-weight: 560; }
.field input, .field select, .field textarea { width: 100%; min-height: 52px; padding: .85rem 1rem; border: 1px solid #a5aaa7; border-radius: 0; background: rgba(255,255,255,.5); color: var(--ink); }
.field textarea { min-height: 150px; resize: vertical; }
.field small { color: #5e686b; font-size: .75rem; }
.field--inline { flex-direction: row; flex-wrap: wrap; align-items: center; gap: .8rem 1.2rem; padding: 0; border: 0; }
.field--inline legend { width: 100%; }
.field--inline label { display: inline-flex; gap: .5rem; align-items: center; min-height: 44px; }
.field [aria-invalid="true"], .choice-grid.is-invalid, .condition-grid.is-invalid, .field--inline.is-invalid { border-color: #a32f22; box-shadow: 0 0 0 1px #a32f22; }
.field-error { color: #8f291e !important; font-family: var(--mono); }
.form-actions { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line-dark); }
.form-error-summary { margin-bottom: 2rem; padding: 1.2rem; border-left: 4px solid #a32f22; background: #ead8d3; }
.form-error-summary h2 { margin-bottom: .7rem; font-size: 1.1rem; letter-spacing: 0; }
.form-error-summary ul { margin: 0; }
.request-review { display: grid; grid-template-columns: 180px 1fr; margin: 2.5rem 0; border-top: 1px solid var(--line-dark); }
.request-review dt, .request-review dd { margin: 0; padding: .9rem 0; border-bottom: 1px solid var(--line-dark); }
.request-review dt { font-family: var(--mono); font-size: .63rem; letter-spacing: .06em; text-transform: uppercase; }
.consent { display: flex; gap: .8rem; align-items: flex-start; padding: 1rem; border: 1px solid var(--line-dark); }
.consent input { margin-top: .25rem; }
.form-success { position: relative; overflow: hidden; padding: clamp(2rem,5vw,5rem); background: var(--ink); color: var(--paper); }
.form-success h2 { margin: 1rem 0; }
.form-success p { max-width: 550px; color: #c0c7c7; }
.form-success__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.2rem; margin-top: 2rem; }
.form-success__signal { position: absolute; right: -10%; top: -40%; width: 420px; aspect-ratio: 1; opacity: .18; }
.form-success__signal i { position: absolute; inset: calc(var(--n) * 12%); border: 1px solid var(--signal); border-radius: 50%; }
.form-success__signal i:nth-child(1){--n:0}.form-success__signal i:nth-child(2){--n:1}.form-success__signal i:nth-child(3){--n:2}
.after-request { display: grid; grid-template-columns: .8fr 1.2fr; gap: 8vw; background: var(--paper-deep); color: var(--ink); }
.after-request h2 { margin: 1rem 0; }
.after-request ol { margin: 0; padding: 0; list-style: none; }
.after-request li { display: grid; grid-template-columns: 55px 1fr; gap: 1rem; padding: 1.5rem 0; border-top: 1px solid var(--line-dark); }
.after-request li span { font-family: var(--mono); font-size: .65rem; }
.after-request li b { font-size: 1.1rem; }
.after-request li p { margin: .4rem 0 0; }

/* Footer */
.site-footer { display: grid; grid-template-columns: 1.2fr .6fr .8fr; gap: 4rem; padding: 4rem var(--gutter); border-top: 1px solid var(--line); background: #0c1114; color: var(--chalk); }
.site-footer__lead > p { max-width: 430px; margin: 1rem 0 0; font-size: 1.45rem; line-height: 1.15; }
.site-footer__routes { display: flex; flex-direction: column; gap: .8rem; }
.site-footer__routes a { font-family: var(--mono); font-size: .66rem; text-transform: uppercase; text-underline-offset: .3rem; }
.site-footer__meta { color: var(--muted); font-family: var(--mono); font-size: .6rem; letter-spacing: .04em; text-transform: uppercase; }

@media (max-width: 1000px) {
  .site-nav { gap: 1rem; }.site-nav__links { gap: 1rem; }
  .motion-toggle__status { display: none; }
  .hero-intro { width: 72vw; }
  .system-bench__workspace { grid-template-columns: 180px 1fr; }
  .layer-readout { grid-column: 1 / -1; min-height: 0; }
  .project-index { grid-template-columns: 1fr; }
  .project-index__header { position: static; }
  .condition-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 700px) {
  :root { --header-h: 68px; }
  h1 { font-size: clamp(3rem,15vw,5.3rem); }
  h2 { font-size: clamp(2.4rem,12vw,4.5rem); }
  .menu-toggle { display: flex; align-items: center; justify-content: center; gap: .6rem; font-family: var(--mono); font-size: .65rem; text-transform: uppercase; }
  .menu-toggle i { width: 15px; height: 10px; border-top: 1px solid; border-bottom: 1px solid; }
  .site-nav { position: fixed; inset: var(--header-h) 0 auto; max-height: 0; display: block; overflow: hidden; background: rgba(17,23,27,.98); color: var(--chalk); transition: max-height .3s ease; }
  .site-header.is-menu-open .site-nav { max-height: 420px; border-bottom: 1px solid var(--line); }
  .site-nav__links { display: flex; flex-direction: column; align-items: stretch; padding: 1rem var(--gutter); }
  .site-nav__links a { min-height: 52px; border-bottom: 1px solid var(--line); }
  .motion-toggle { width: calc(100% - 2 * var(--gutter)); justify-content: space-between; margin: 0 var(--gutter) 1.25rem; }
  .motion-toggle__status { display: inline; }
  .roof-experience { height: 580vh; }
  .roof-stage__veil { background: linear-gradient(0deg,rgba(5,8,10,.86),rgba(5,8,10,.08) 65%),linear-gradient(90deg,rgba(5,8,10,.45),transparent); }
  .hero-intro { left: var(--gutter); right: var(--gutter); top: auto; bottom: 9rem; width: auto; }
  .hero-intro h1 { font-size: clamp(3rem,14vw,5.1rem); }
  .hero-intro > p { font-size: .95rem; }
  .chapter-stack { left: var(--gutter); right: var(--gutter); top: auto; bottom: 9rem; width: auto; transform: none; }
  .sequence-chapter h2 { font-size: clamp(2.8rem,13vw,4.7rem); }
  .sequence-status { grid-template-columns: auto 1fr; bottom: 1.3rem; }
  .sequence-status__hint { display: none; }
  .sequence-skip { top: calc(var(--header-h) + .8rem); }
  .section-heading--offset { margin-left: 0; }
  .evidence-route { grid-template-columns: 1fr; }
  .evidence-route article { min-height: 310px; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .assembly-preview, .page-hero, .project-index, .after-request { grid-template-columns: 1fr; }
  .assembly-preview__diagram { height: 420px; }
  .page-hero { min-height: 700px; padding-top: calc(var(--header-h) + 4rem); }
  .roof-blueprint { width: 80%; margin-left: auto; }
  .system-bench__header { display: block; }
  .system-bench__header > p { margin-top: 1.5rem; }
  .system-bench__workspace { display: block; margin-top: 3rem; }
  .layer-controls { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; }
  .layer-controls button { flex: 0 0 170px; scroll-snap-align: start; border-right: 1px solid var(--line-dark); }
  .layer-model { height: 490px; margin-top: 2rem; }
  .layer-plane { left: 8%; right: 13%; }
  .layer-readout { margin-top: 2rem; }
  .failure-path__steps { grid-template-columns: 1fr 1fr; }
  .failure-path__steps li { border-bottom: 1px solid var(--line); }
  .project-index summary { grid-template-columns: 70px 1fr; }
  .project-index summary em { display: none; }
  .project-study { padding-left: 0; }
  .inspection-shell { padding-top: calc(var(--header-h) + 3rem); }
  .inspection-workspace { display: block; margin-top: 3rem; }
  .form-progress ol { display: grid; grid-template-columns: repeat(4,1fr); }
  .form-progress li { display: block; min-height: 46px; }
  .form-progress li b { display: none; }
  .form-progress__line { margin: 0 0 2.5rem; }
  .choice-grid, .condition-grid, .field-row { grid-template-columns: 1fr; }
  .condition-card { min-height: 100px; }
  .form-actions { align-items: stretch; }
  .form-actions .button { flex: 1; }
  .request-review { grid-template-columns: 110px 1fr; }
  .site-footer { grid-template-columns: 1fr; gap: 2rem; }
}

html[data-motion="reduced"] .roof-experience { height: auto; min-height: 0; }
html[data-motion="reduced"] .roof-stage { display: none; }
html[data-motion="reduced"] .reduced-roof-story { display: block; padding: calc(var(--header-h) + 5rem) var(--gutter) 6rem; background: #10171b; }
.reduced-roof-story header { max-width: 900px; }
.reduced-roof-story header h1 { margin: 1.2rem 0 3rem; }
.reduced-roof-story__grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 1px; background: var(--line); }
.reduced-roof-story figure { margin: 0; background: #11171b; }
.reduced-roof-story picture img { width: 100%; aspect-ratio: 16/8.8; object-fit: cover; }
.reduced-roof-story figcaption { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem; }
.reduced-roof-story figcaption b { color: var(--signal); }
.reduced-roof-story figcaption span { color: var(--muted); }
.reduced-roof-story > .button { margin-top: 2rem; }

@media (prefers-reduced-motion: reduce) {
  html[data-motion="system"] { scroll-behavior: auto; }
  html[data-motion="system"] .roof-experience { height: auto; min-height: 0; }
  html[data-motion="system"] .roof-stage { display: none; }
  html[data-motion="system"] .reduced-roof-story { display: block; padding: calc(var(--header-h) + 5rem) var(--gutter) 6rem; background: #10171b; }
  html[data-motion="system"] *, html[data-motion="reduced"] * { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

@media (max-width: 700px) {
  .reduced-roof-story__grid { grid-template-columns: 1fr; }
  .reduced-roof-story picture img { aspect-ratio: 4/5; }
  .reduced-roof-story figcaption { display: block; }
  .reduced-roof-story figcaption span { display: block; margin-top: .3rem; }
}