/* ============================================================
   Design B — Construction Exposed Systems × Renew Plumbing
   All selectors scoped to [data-design="b"] or @media/@keyframes/:root
   ZERO bare/global rules. No design-id "construction-exposed-systems" selectors.
   ============================================================ */

/* --- Design tokens (exposed via :root for host harness) --- */
:root {
  --design-b-primary:    #D62828;
  /* Pompidou quartet */
  --b-sys-structural:    #D62828;
  --b-sys-mechanical:    #1D6FB8;
  --b-sys-electrical:    #2A9D45;
  --b-sys-ventilation:   #F4B400;
  /* Cast-paper neutrals */
  --b-ink:               #0E1115;
  --b-ink-2:             #2A2F37;
  --b-paper:             #F2EFE8;
  --b-paper-2:           #E8E3D8;
  --b-rule:              #C9C2B4;
  --b-guide:             #4A6FA5;
  --b-muted:             #6B6F76;
  --b-critical:          #9E1212;
  /* Typography */
  --b-font-display:      "Inter Tight","Helvetica Now Display",-apple-system,system-ui,sans-serif;
  --b-font-body:         "Inter",-apple-system,system-ui,sans-serif;
  --b-font-mono:         "JetBrains Mono","IBM Plex Mono",ui-monospace,Menlo,monospace;
  --b-font-stamp:        "Times New Roman",Times,serif;
  /* Spacing */
  --b-gap-hair:          1px;
  --b-gap-tight:         4px;
  --b-gap-x:             8px;
  --b-gap-row:           16px;
  --b-gap-block:         24px;
  --b-gap-stack:         48px;
  --b-gap-section:       96px;
  --b-gap-section-m:     64px;
  --b-gap-section-s:     48px;
  /* Motion */
  --b-ease-snap:         cubic-bezier(0.16, 1, 0.3, 1);
  --b-ease-draft:        cubic-bezier(0.65, 0, 0.35, 1);
  --b-dur-fast:          160ms;
  --b-dur-base:          320ms;
  --b-dur-draw:          1400ms;
  /* Radius */
  --b-r-0:               0;
  --b-r-1:               2px;
  --b-r-2:               4px;
  /* Elevation */
  --b-elev-ring:         0 0 0 1px var(--b-rule);
  --b-elev-card:         0 0 0 1px var(--b-rule), 0 1px 0 var(--b-rule);
  --b-elev-drawer:       0 0 0 1px var(--b-ink), 0 24px 64px -32px rgba(14,17,21,0.45);
}

/* ============================================================
   BASE RESET (scoped)
============================================================ */
[data-design="b"].dq-design,
[data-design="b"] .dq-design {
  box-sizing: border-box;
  font-family: var(--b-font-body);
  background: var(--b-paper);
  color: var(--b-ink);
  line-height: 1.6;
}
[data-design="b"].dq-design *,
[data-design="b"].dq-design *::before,
[data-design="b"].dq-design *::after {
  box-sizing: inherit;
}

/* ============================================================
   ELEMENT 1 — Header
============================================================ */
[data-design="b"] .rf-header {
  position: relative;
  background: var(--b-paper);
  border-bottom: 1px solid var(--b-rule);
}
[data-design="b"] .rf-header__bar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(16px, 4vw, 40px);
}
[data-design="b"] .rf-logo {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  text-decoration: none;
  color: var(--b-ink);
  font-family: var(--b-font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
}
[data-design="b"] .rf-logo__mark {
  display: inline-flex;
  color: var(--b-sys-mechanical);
}
[data-design="b"] .rf-burger {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 12px;
  background: transparent;
  border: 1px solid var(--b-ink);
  border-radius: 0;
  cursor: pointer;
  transition: background var(--b-dur-fast) var(--b-ease-snap);
  min-width: 44px;
  min-height: 44px;
  justify-content: center;
  align-items: center;
}
[data-design="b"] .rf-burger__line {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--b-ink);
  transition: transform var(--b-dur-fast) var(--b-ease-snap);
}
[data-design="b"] .rf-burger:hover {
  background: var(--b-ink);
}
[data-design="b"] .rf-burger:hover .rf-burger__line {
  background: var(--b-paper);
}
[data-design="b"] .rf-burger:focus-visible {
  outline: 2px solid var(--b-sys-structural);
  outline-offset: 2px;
}

/* atmospheric line-draw: pipe-run behind the bar */
[data-design="b"] .rf-header__atmos {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.22;
}
[data-design="b"] .rf-header__atmos line,
[data-design="b"] .rf-header__atmos circle {
  fill: var(--b-sys-mechanical);
  stroke: var(--b-sys-mechanical);
  stroke-width: 1;
  stroke-linecap: square;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: b-header-draw 28s var(--b-ease-draft) infinite;
}
[data-design="b"] .rf-header__atmos circle {
  fill: var(--b-sys-mechanical);
  stroke: none;
}
[data-design="b"] .rf-header__dim {
  stroke: var(--b-sys-structural);
}
[data-design="b"] .rf-header__dimlabel {
  fill: var(--b-sys-structural);
  font-family: var(--b-font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  opacity: 0;
  animation: b-header-label 28s var(--b-ease-snap) infinite;
}

@keyframes b-header-draw {
  0%   { stroke-dashoffset: 200; opacity: 0; }
  18%  { stroke-dashoffset: 0;   opacity: 1; }
  72%  { stroke-dashoffset: 0;   opacity: 1; }
  86%  { stroke-dashoffset: 0;   opacity: 0; }
  100% { stroke-dashoffset: 200; opacity: 0; }
}
@keyframes b-header-label {
  0%, 24% { opacity: 0; }
  28%, 70% { opacity: 1; }
  84%, 100% { opacity: 0; }
}

/* DRAWER */
[data-design="b"] .rf-drawer {
  position: fixed;
  inset: 0;
  background: rgba(14,17,21,0.22);
  z-index: 50;
  display: flex;
  justify-content: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--b-dur-base) var(--b-ease-snap);
}
[data-design="b"] .rf-drawer[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}
[data-design="b"] .rf-drawer__sheet {
  width: min(440px, 100vw);
  height: 100%;
  background: var(--b-paper);
  box-shadow: var(--b-elev-drawer);
  padding: clamp(20px, 4vw, 40px);
  transform: translateX(24px);
  transition: transform var(--b-dur-base) var(--b-ease-snap);
  display: flex;
  flex-direction: column;
  gap: 32px;
  overflow-y: auto;
}
[data-design="b"] .rf-drawer[data-open="true"] .rf-drawer__sheet {
  transform: translateX(0);
}
[data-design="b"] .rf-drawer__title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--b-ink);
  padding-bottom: 10px;
  font-family: var(--b-font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
[data-design="b"] .rf-drawer__nav {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
[data-design="b"] .rf-drawer__nav .rf-nav-a {
  display: grid;
  grid-template-columns: 36px 1fr;
  align-items: baseline;
  text-decoration: none;
  color: var(--b-ink);
  font-family: var(--b-font-display);
  font-size: 24px;
  letter-spacing: -0.01em;
  min-height: 44px;
}
[data-design="b"] .rf-drawer__nav .rf-nav-a::before {
  content: attr(data-no);
  color: var(--b-guide);
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding-top: 8px;
}
[data-design="b"] .rf-drawer__nav .rf-nav-a:hover {
  color: var(--b-sys-structural);
}
[data-design="b"] .rf-drawer__cta-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px solid var(--b-rule);
  padding-top: 24px;
}
[data-design="b"] .rf-drawer__close {
  align-self: flex-start;
  margin-top: auto;
  background: transparent;
  border: 1px solid var(--b-ink);
  padding: 10px 16px;
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  cursor: pointer;
  border-radius: 0;
  min-height: 44px;
}
[data-design="b"] .rf-drawer__close:hover {
  background: var(--b-ink);
  color: var(--b-paper);
}

/* ============================================================
   HERO — Element 2 (phone CTA) + Element 3 backdrop
============================================================ */
[data-design="b"] .rf-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: center;
  background: var(--b-paper);
  overflow: hidden;
  border-bottom: 1px solid var(--b-rule);
  padding: clamp(64px, 10vw, 120px) clamp(16px, 5vw, 60px);
}
/* Backdrop — absolute, behind text, pointer-events:none */
[data-design="b"] .rf-hero__backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.32;
}
[data-design="b"] .rf-hero__riser {
  width: 100%;
  height: 100%;
  display: block;
}
/* Pipe run lines — ambient sustained motion via animateMotion on flow dots */
[data-design="b"] .b-run {
  fill: none;
  stroke-width: 2;
  stroke-linecap: square;
  stroke-dasharray: 800;
  stroke-dashoffset: 800;
  animation: b-run-draw var(--b-dur-draw) var(--b-ease-draft) 0.3s forwards;
}
[data-design="b"] .b-run--m { stroke: var(--b-sys-mechanical); }
[data-design="b"] .b-run--s { stroke: var(--b-sys-structural); animation-delay: 0.6s; }
[data-design="b"] .b-run--v { stroke: var(--b-sys-ventilation); animation-delay: 0.9s; }
[data-design="b"] .b-run--e { stroke: var(--b-sys-electrical); animation-delay: 1.2s; }
[data-design="b"] .b-flow {
  opacity: 0;
  animation: b-flow-appear 0.5s var(--b-ease-snap) 1.8s forwards;
}
[data-design="b"] .b-flow--m { fill: var(--b-sys-mechanical); }
[data-design="b"] .b-flow--s { fill: var(--b-sys-structural); animation-delay: 2s; }
[data-design="b"] .b-flow--v { fill: var(--b-sys-ventilation); animation-delay: 2.2s; }
[data-design="b"] .b-flow--e { fill: var(--b-sys-electrical); animation-delay: 2.4s; }
[data-design="b"] .b-dim-label {
  fill: var(--b-sys-structural);
  font-family: var(--b-font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  opacity: 0.7;
}
[data-design="b"] .b-title-text {
  fill: var(--b-muted);
  font-family: var(--b-font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
}
[data-design="b"] .b-title-meta {
  fill: var(--b-muted);
  font-family: var(--b-font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-anchor: end;
}

@keyframes b-run-draw { to { stroke-dashoffset: 0; } }
@keyframes b-flow-appear { to { opacity: 1; } }

/* Hero text — in normal flow over backdrop, NO overlap, opacity:1 at first paint */
[data-design="b"] .rf-hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 620px;
}
[data-design="b"] .rf-hero__meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--b-muted);
  margin: 0;
  opacity: 1;
}
[data-design="b"] .rf-hero__h1 {
  font-family: var(--b-font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--b-ink);
  margin: 0;
  opacity: 1;
}
[data-design="b"] .rf-hero__sub {
  font-family: var(--b-font-body);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.5;
  color: var(--b-ink-2);
  margin: 0;
  max-width: 52ch;
  opacity: 1;
}
[data-design="b"] .rf-hero__proof {
  font-family: var(--b-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--b-muted);
  margin: 0;
  opacity: 1;
}

/* ============================================================
   ELEMENT 2 — CTA (phone + schedule variants)
============================================================ */
[data-design="b"] .rf-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--b-ink);
  color: var(--b-paper);
  font-family: var(--b-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--b-r-1);
  transition: transform var(--b-dur-fast) var(--b-ease-snap), background var(--b-dur-fast) var(--b-ease-snap);
  overflow: hidden;
  min-height: 44px;
  width: fit-content;
}
[data-design="b"] .rf-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--b-ink);
  border-radius: var(--b-r-1);
  pointer-events: none;
}
[data-design="b"] .rf-cta--hero {
  font-size: 16px;
  padding: 20px 32px;
  letter-spacing: 0.1em;
  min-height: 56px;
}
[data-design="b"] .rf-cta--schedule {
  background: var(--b-paper);
  color: var(--b-ink);
}
[data-design="b"] .rf-cta--schedule::before {
  border-color: var(--b-ink);
}
[data-design="b"] .rf-cta--footer {
  background: transparent;
  color: var(--b-ink);
  border: 1px solid var(--b-ink);
  margin-top: 12px;
}
[data-design="b"] .rf-cta__arrow {
  overflow: visible;
  flex-shrink: 0;
}
[data-design="b"] .rf-cta__shaft {
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
  stroke-dasharray: 26;
  stroke-dashoffset: 8;
  transition: stroke-dashoffset var(--b-dur-base) var(--b-ease-snap);
}
[data-design="b"] .rf-cta__head {
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
  stroke-linejoin: miter;
  transform: translateX(0);
  transition: transform var(--b-dur-base) var(--b-ease-snap);
}
[data-design="b"] .rf-cta__rule {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 10px;
  height: 1px;
  background: var(--b-sys-structural);
  transform-origin: left;
  animation: b-cta-breath 4.4s ease-in-out infinite;
}
[data-design="b"] .rf-cta:hover .rf-cta__shaft {
  stroke-dashoffset: 0;
}
[data-design="b"] .rf-cta:hover .rf-cta__head {
  transform: translateX(6px);
}
[data-design="b"] .rf-cta:hover .rf-cta__rule {
  height: 2px;
  animation-play-state: paused;
  transform: scaleX(1);
}
[data-design="b"] .rf-cta:active {
  transform: scale(0.985);
}
[data-design="b"] .rf-cta:focus-visible {
  outline: 2px solid var(--b-sys-structural);
  outline-offset: 3px;
}

@keyframes b-cta-breath {
  0%, 100% { transform: scaleX(0.5); opacity: 0.7; }
  50%       { transform: scaleX(1);   opacity: 1; }
}

/* ============================================================
   ELEMENT 6 — Pointer (immediate preceding sibling of #funnel)
   data-mf-role="pointer" · height > 8px (≥ 12px per spec)
============================================================ */
[data-design="b"] .exsys-pointer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px clamp(16px, 4vw, 40px);
  font-family: var(--b-font-mono);
  font-variant-numeric: tabular-nums;
  border-top: 1px solid var(--b-rule);
  border-bottom: 1px solid var(--b-rule);
  background: var(--b-paper-2);
  opacity: 1;
  min-height: 52px;
}
[data-design="b"] .exsys-pointer__counter {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--b-muted);
  white-space: nowrap;
}
[data-design="b"] .exsys-pointer__counter-label {
  color: var(--b-ink);
  font-weight: 600;
}
[data-design="b"] .exsys-pointer__counter-now {
  display: inline-block;
  min-width: 1ch;
  color: var(--b-sys-structural);
  animation: b-pointer-tick 320ms ease-out;
}
[data-design="b"] .exsys-pointer__bar {
  position: relative;
  flex: 1;
  height: 2px;
  background: var(--b-rule);
  overflow: hidden;
}
[data-design="b"] .exsys-pointer__bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--exsys-pointer-progress, 20%);
  background: var(--b-sys-mechanical);
  transition: width 480ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
[data-design="b"] .exsys-pointer__chev {
  font-size: 20px;
  color: var(--b-sys-structural);
  opacity: 0.8;
  animation: b-pointer-chev 4s ease-in-out infinite;
}

@keyframes b-pointer-tick {
  0%   { transform: translateY(-6px); opacity: 0; }
  100% { transform: translateY(0);    opacity: 1; }
}
@keyframes b-pointer-chev {
  0%, 100% { transform: translateX(0);   opacity: 0.5; }
  50%      { transform: translateX(4px); opacity: 1; }
}

/* ============================================================
   ELEMENT 5 — Funnel (5-step scheduling intake)
   id="funnel" data-mf-role="funnel"
============================================================ */
[data-design="b"] .rf-interactive {
  padding: var(--b-gap-section) clamp(16px, 4vw, 40px);
  background: var(--b-paper);
  border-top: 1px solid var(--b-ink);
}
[data-design="b"] .rf-funnel__masthead {
  max-width: 720px;
  margin: 0 0 48px;
}
[data-design="b"] .rf-funnel__masthead .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--b-muted);
  margin: 0 0 12px;
  text-transform: uppercase;
}
[data-design="b"] .rf-funnel__masthead .rf-h2 {
  font-family: var(--b-font-display);
  font-size: clamp(28px, 3.6vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--b-ink);
}
[data-design="b"] .rf-funnel__index {
  list-style: none;
  padding: 16px 0 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--b-ink);
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}
[data-design="b"] .rf-funnel__index li {
  display: flex;
  gap: 6px;
  align-items: baseline;
  padding: 12px 8px;
  color: var(--b-muted);
  border-right: 1px solid var(--b-rule);
  flex-wrap: wrap;
}
[data-design="b"] .rf-funnel__index li:last-child { border-right: 0; }
[data-design="b"] .rf-funnel__index li span { color: var(--b-guide); }
[data-design="b"] .rf-funnel__index li.is-current {
  color: var(--b-ink);
  background: var(--b-paper-2);
}
[data-design="b"] .rf-funnel__index li.is-done { color: var(--b-ink); }
[data-design="b"] .rf-funnel__index li.is-done::after {
  content: "✓";
  margin-left: auto;
  color: var(--b-sys-electrical);
}
[data-design="b"] .rf-funnel {
  position: relative;
  min-height: 420px;
}
[data-design="b"] .rf-funnel__sheet {
  background: var(--b-paper);
  border: 1px solid var(--b-ink);
  padding: 32px clamp(20px, 3vw, 40px);
  transition: opacity var(--b-dur-base) var(--b-ease-snap), transform var(--b-dur-base) var(--b-ease-snap);
  opacity: 1;
  transform: translateX(0);
}
[data-design="b"] .rf-funnel__sheet[hidden] { display: none; }
[data-design="b"] .rf-funnel__sheet.is-leaving {
  opacity: 0;
  transform: translateX(-24px);
}
[data-design="b"] .rf-funnel__sheet.is-entering {
  opacity: 0;
  transform: translateX(24px);
}
[data-design="b"] .rf-funnel__title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--b-ink);
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
[data-design="b"] .rf-funnel__title .rf-funnel__sheet-no { color: var(--b-muted); }
[data-design="b"] .rf-funnel fieldset {
  border: 0;
  padding: 0;
  margin: 0 0 32px;
}
[data-design="b"] .rf-field__label {
  display: block;
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--b-ink);
  margin-bottom: 16px;
}
[data-design="b"] .rf-required {
  color: var(--b-sys-structural);
  font-size: 8px;
  vertical-align: middle;
}
[data-design="b"] .rf-funnel__choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
[data-design="b"] .rf-funnel__choice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--b-rule);
  cursor: pointer;
  transition: border-color var(--b-dur-fast) var(--b-ease-snap), background var(--b-dur-fast) var(--b-ease-snap);
  font-size: 15px;
  min-height: 44px;
  border-radius: 0;
}
[data-design="b"] .rf-funnel__choice:hover { border-color: var(--b-ink); }
[data-design="b"] .rf-funnel__choice input { accent-color: var(--b-sys-structural); }
[data-design="b"] .rf-funnel__choice:has(input:checked) {
  border-color: var(--b-ink);
  background: var(--b-paper-2);
}
[data-design="b"] .rf-funnel__emergency-shortcut {
  margin-top: 20px;
  padding: 16px;
  border: 1px solid var(--b-sys-structural);
  background: var(--b-paper-2);
}
[data-design="b"] .rf-emergency-msg {
  font-size: 15px;
  color: var(--b-ink);
  margin: 0;
}
[data-design="b"] .rf-emergency-msg a {
  color: var(--b-sys-structural);
  font-weight: 600;
}
[data-design="b"] .rf-funnel__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 24px;
  margin-bottom: 32px;
}
[data-design="b"] .rf-field--wide { grid-column: 1 / -1; }
[data-design="b"] .rf-input {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--b-ink);
  background: var(--b-paper);
  font-family: var(--b-font-body);
  font-size: 16px;
  color: var(--b-ink);
  border-radius: var(--b-r-1);
  outline: none;
  transition: border-width var(--b-dur-fast) var(--b-ease-snap);
}
[data-design="b"] .rf-input:focus-visible {
  border-color: var(--b-sys-structural);
  box-shadow: inset 0 0 0 1px var(--b-sys-structural);
}
[data-design="b"] .rf-input--textarea {
  resize: vertical;
  min-height: 80px;
}
[data-design="b"] .rf-funnel__actions {
  display: flex;
  gap: 16px;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--b-rule);
  flex-wrap: wrap;
}
[data-design="b"] .rf-funnel__actions [data-stamp] { margin-left: auto; }
[data-design="b"] .rf-funnel__actions [data-stamp][hidden] { display: none; }
[data-design="b"] .rf-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  font-family: var(--b-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: var(--b-r-1);
  cursor: pointer;
  transition: transform var(--b-dur-fast) var(--b-ease-snap), background var(--b-dur-fast) var(--b-ease-snap);
  border: 1px solid var(--b-ink);
  min-height: 44px;
}
[data-design="b"] .rf-btn--primary {
  background: var(--b-ink);
  color: var(--b-paper);
}
[data-design="b"] .rf-btn--primary:hover { background: #000; }
[data-design="b"] .rf-btn--secondary {
  background: var(--b-paper);
  color: var(--b-ink);
}
[data-design="b"] .rf-btn--secondary:hover { background: var(--b-paper-2); }
[data-design="b"] .rf-btn:active { transform: scale(0.985); }
[data-design="b"] .rf-btn:focus-visible {
  outline: 2px solid var(--b-sys-structural);
  outline-offset: 2px;
}
[data-design="b"] .rf-stamp {
  display: inline-flex;
  padding: 6px 10px;
  border: 1.5px solid currentColor;
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transform: rotate(-2deg);
  animation: b-stamp 200ms var(--b-ease-snap);
}
[data-design="b"] .rf-stamp--field-verified { color: var(--b-sys-mechanical); }
[data-design="b"] .rf-stamp--in-review      { color: var(--b-sys-ventilation); }
[data-design="b"] .rf-stamp--approved       { color: var(--b-sys-structural); }

[data-design="b"] .rf-funnel__issued {
  margin-top: 32px;
  padding: 40px;
  border: 2px solid var(--b-ink);
  text-align: left;
  display: grid;
  gap: 16px;
}
[data-design="b"] .rf-funnel__issued[hidden] { display: none; }
[data-design="b"] .rf-issued-stamp {
  display: inline-block;
  padding: 16px 24px;
  border: 3px double var(--b-sys-structural);
  color: var(--b-sys-structural);
  font-family: var(--b-font-stamp);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: rotate(-3.5deg);
  justify-self: start;
  animation: b-issued-stamp 480ms var(--b-ease-snap);
}
[data-design="b"] .rf-funnel__thanks {
  font-size: 18px;
  line-height: 1.5;
  color: var(--b-ink);
  margin: 0;
}
[data-design="b"] .rf-funnel__thanks a { color: var(--b-sys-structural); }
[data-design="b"] .rf-funnel__below {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--b-rule);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 40px;
}
[data-design="b"] .rf-funnel__below .rf-meta { color: var(--b-muted); }
[data-design="b"] .rf-funnel__below a { color: var(--b-sys-mechanical); text-decoration: none; }

@keyframes b-stamp {
  0%   { opacity: 0; transform: rotate(-2deg) scale(1.12); }
  100% { opacity: 1; transform: rotate(-2deg) scale(1); }
}
@keyframes b-issued-stamp {
  0%   { opacity: 0; transform: rotate(-3.5deg) scale(1.18); }
  60%  { opacity: 1; transform: rotate(-3.5deg) scale(0.98); }
  100% { opacity: 1; transform: rotate(-3.5deg) scale(1); }
}

/* ============================================================
   SERVICES — Trade Index (folio accordion)
============================================================ */
[data-design="b"] .rf-services {
  padding: var(--b-gap-section) clamp(16px, 4vw, 40px);
  background: var(--b-paper-2);
  border-top: 1px solid var(--b-rule);
}
[data-design="b"] .rf-services__head {
  max-width: 600px;
  margin: 0 0 48px;
}
[data-design="b"] .rf-services__head .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--b-muted);
  margin: 0 0 12px;
  text-transform: uppercase;
}
[data-design="b"] .rf-services__head .rf-h2 {
  font-family: var(--b-font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0;
  color: var(--b-ink);
}
[data-design="b"] .rf-trade-index {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--b-ink);
}
[data-design="b"] .rf-folio {
  border-bottom: 1px solid var(--b-rule);
}
[data-design="b"] .rf-folio__trigger {
  display: grid;
  grid-template-columns: 48px 1fr 28px;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 18px 16px 18px 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: var(--b-font-display);
  font-size: 18px;
  color: var(--b-ink);
  text-align: left;
  transition: color var(--b-dur-fast) var(--b-ease-snap);
  min-height: 44px;
}
[data-design="b"] .rf-folio__trigger:hover { color: var(--b-sys-structural); }
[data-design="b"] .rf-folio__no {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--b-guide);
}
[data-design="b"] .rf-folio__toggle {
  font-family: var(--b-font-mono);
  font-size: 16px;
  color: var(--b-muted);
  justify-self: end;
}
[data-design="b"] .rf-folio__trigger[aria-expanded="true"] .rf-folio__toggle { content: "−"; }
[data-design="b"] .rf-folio__body {
  padding: 0 16px 24px 56px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--b-ink-2);
  max-width: 72ch;
}
[data-design="b"] .rf-folio__body[hidden] { display: none; }
[data-design="b"] .rf-folio__body p { margin: 0 0 16px; }
[data-design="b"] .rf-folio__footer {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 16px;
  border-top: 1px solid var(--b-rule);
  margin-top: 8px;
}
[data-design="b"] .rf-chip {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--b-muted);
  text-transform: uppercase;
}
[data-design="b"] .rf-inline-cta {
  font-family: var(--b-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--b-sys-mechanical);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ============================================================
   ELEMENT 3 — Ambient A (building systems / service area)
============================================================ */
[data-design="b"] .rf-ambient-a {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  padding: var(--b-gap-section) clamp(16px, 4vw, 40px);
  align-items: start;
  background: var(--b-paper);
  border-top: 1px solid var(--b-rule);
  border-bottom: 1px solid var(--b-rule);
}
[data-design="b"] .rf-ambient-a__copy .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--b-muted);
  margin: 0 0 24px;
  text-transform: uppercase;
}
[data-design="b"] .rf-ambient-a__copy .rf-h2 {
  font-family: var(--b-font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--b-ink);
}
[data-design="b"] .rf-ambient-a__copy .rf-body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--b-ink-2);
  max-width: 48ch;
}
[data-design="b"] .rf-ambient-a__copy .rf-body a {
  color: var(--b-sys-mechanical);
  text-decoration: none;
}
[data-design="b"] .rf-ambient-a__copy .rf-body p { margin: 0 0 16px; }
[data-design="b"] .rf-legend {
  list-style: none;
  padding: 24px 0 0;
  margin: 32px 0 0;
  border-top: 1px solid var(--b-rule);
  display: grid;
  grid-template-columns: repeat(2, max-content);
  gap: 12px 32px;
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
[data-design="b"] .rf-legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--b-muted);
}
[data-design="b"] .rf-legend__sw {
  width: 14px;
  height: 14px;
  border: 1px solid var(--b-ink);
  display: inline-block;
}
[data-design="b"] .rf-legend__sw--s { background: var(--b-sys-structural); }
[data-design="b"] .rf-legend__sw--m { background: var(--b-sys-mechanical); }
[data-design="b"] .rf-legend__sw--e { background: var(--b-sys-electrical); }
[data-design="b"] .rf-legend__sw--v { background: var(--b-sys-ventilation); }
[data-design="b"] .rf-ambient-a__motion {
  width: 100%;
  max-width: 480px;
  justify-self: end;
  background: var(--b-paper-2);
  border: 1px solid var(--b-rule);
  padding: 16px;
}
[data-design="b"] .rf-ambient-a__motion svg {
  width: 100%;
  height: auto;
  display: block;
}
[data-design="b"] .rf-section__outline {
  fill: none;
  stroke: var(--b-ink);
  stroke-width: 1.5;
}
[data-design="b"] .rf-section__floor {
  stroke: var(--b-rule);
  stroke-width: 1;
  stroke-dasharray: 2 4;
}
[data-design="b"] .rf-run {
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: square;
  stroke-dasharray: 480;
  stroke-dashoffset: 480;
}
[data-design="b"] .rf-ambient-a__motion.is-active .rf-run {
  animation: b-amba-draw var(--b-dur-draw) var(--b-ease-draft) forwards;
}
[data-design="b"] .rf-ambient-a__motion.is-active .rf-run--m { animation-delay: 200ms; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-run--e { animation-delay: 400ms; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-run--v { animation-delay: 600ms; }
[data-design="b"] .rf-run--m { stroke: var(--b-sys-mechanical); }
[data-design="b"] .rf-run--s { stroke: var(--b-sys-structural); }
[data-design="b"] .rf-run--v { stroke: var(--b-sys-ventilation); }
[data-design="b"] .rf-run--e { stroke: var(--b-sys-electrical); }
[data-design="b"] .rf-flow { fill: var(--b-ink); opacity: 0; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--s { fill: var(--b-sys-structural); opacity: 1; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--m { fill: var(--b-sys-mechanical); opacity: 1; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--e { fill: var(--b-sys-electrical); opacity: 1; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--v { fill: var(--b-sys-ventilation); opacity: 1; }
[data-design="b"] .rf-section__dim { stroke: var(--b-ink); stroke-width: 1; }
[data-design="b"] .rf-section__dim-label {
  fill: var(--b-muted);
  font-family: var(--b-font-mono);
  font-size: 8px;
  letter-spacing: 0.12em;
}

@keyframes b-amba-draw { to { stroke-dashoffset: 0; } }

/* ============================================================
   ABOUT
============================================================ */
[data-design="b"] .rf-about {
  padding: var(--b-gap-section) clamp(16px, 4vw, 40px);
  background: var(--b-paper-2);
  border-top: 1px solid var(--b-rule);
}
[data-design="b"] .rf-about__sheet {
  border: 1px solid var(--b-rule);
  background: var(--b-paper);
  padding: var(--b-gap-block);
}
[data-design="b"] .rf-about__title-block {
  padding-bottom: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--b-ink);
}
[data-design="b"] .rf-about__title-block .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--b-muted);
  margin: 0 0 12px;
  text-transform: uppercase;
}
[data-design="b"] .rf-about__title-block .rf-h2 {
  font-family: var(--b-font-display);
  font-size: clamp(24px, 2.8vw, 32px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0;
  color: var(--b-ink);
}
[data-design="b"] .rf-about__columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
[data-design="b"] .rf-about__col .rf-field__label {
  margin-bottom: 12px;
  color: var(--b-guide);
}
[data-design="b"] .rf-about__col p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--b-ink-2);
  margin: 0;
}
[data-design="b"] .rf-about__col a {
  color: var(--b-sys-mechanical);
  text-decoration: none;
}

/* ============================================================
   ELEMENT 4 — Ambient B (exploded assembly: pipe layers)
============================================================ */
[data-design="b"] .rf-ambient-b {
  padding: var(--b-gap-section) clamp(16px, 4vw, 40px);
  background: var(--b-paper);
  border-top: 1px solid var(--b-rule);
}
[data-design="b"] .rf-ambient-b__head {
  max-width: 60ch;
  margin: 0 0 56px;
}
[data-design="b"] .rf-ambient-b__head .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--b-muted);
  margin: 0 0 16px;
  text-transform: uppercase;
}
[data-design="b"] .rf-ambient-b__head .rf-h2 {
  font-family: var(--b-font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 20px;
  color: var(--b-ink);
}
[data-design="b"] .rf-ambient-b__head .rf-body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--b-ink-2);
}
[data-design="b"] .rf-ambient-b__head .rf-body p { margin: 0; }
[data-design="b"] .rf-ambient-b__motion {
  margin: 0;
  padding: 24px;
  background: var(--b-paper-2);
  border: 1px solid var(--b-rule);
}
[data-design="b"] .rf-ambient-b__motion svg {
  width: 100%;
  height: auto;
  display: block;
  color: var(--b-ink);
}
[data-design="b"] .rf-layer polygon {
  fill: var(--b-paper);
  stroke: var(--b-ink);
  stroke-width: 1.5;
  transform-origin: 50% 50%;
  transition: transform var(--b-dur-base) var(--b-ease-snap);
}
[data-design="b"] .rf-layer .rf-lead {
  stroke: var(--b-sys-structural);
  stroke-width: 1;
  stroke-dasharray: 60;
  stroke-dashoffset: 60;
  transition: stroke-dashoffset var(--b-dur-base) var(--b-ease-draft);
}
[data-design="b"] .rf-layer .rf-lead-label {
  font-family: var(--b-font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  fill: var(--b-ink);
  opacity: 0;
  transition: opacity var(--b-dur-base) var(--b-ease-snap);
}
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer {
  animation: b-ambb-lift 20s var(--b-ease-snap) infinite;
}
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer--1 { animation-delay: 0s; }
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer--2 { animation-delay: 1s; }
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer--3 { animation-delay: 2s; }
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer--4 { animation-delay: 3s; }
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer--5 { animation-delay: 4s; }
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer .rf-lead { stroke-dashoffset: 0; }
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer .rf-lead-label { opacity: 1; }

@keyframes b-ambb-lift {
  0%, 90%, 100% { transform: translateY(0); }
  30%, 60%      { transform: translateY(-12px); }
}

/* ============================================================
   FOOTER
============================================================ */
[data-design="b"] .rf-footer {
  padding: 0 clamp(16px, 4vw, 40px);
  background: var(--b-paper);
}
[data-design="b"] .rf-footer__top-rule {
  height: 1px;
  background: var(--b-ink);
  margin-bottom: 0;
}
[data-design="b"] .rf-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding: 48px 0 32px;
}
[data-design="b"] .rf-footer__col .rf-field__label {
  color: var(--b-guide);
  margin-bottom: 12px;
}
[data-design="b"] .rf-footer__col .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--b-muted);
  margin: 0;
  line-height: 1.8;
}
[data-design="b"] .rf-footer__col a {
  color: var(--b-sys-mechanical);
  text-decoration: none;
}
[data-design="b"] .rf-footer__mid-rule {
  height: 1px;
  background: var(--b-rule);
  margin: 0;
}
[data-design="b"] .rf-footer__bottom-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  flex-wrap: wrap;
  gap: 12px;
}
[data-design="b"] .rf-footer__bottom-row .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--b-muted);
  margin: 0;
}
[data-design="b"] .rf-footer__bottom-rule {
  height: 1px;
  background: var(--b-ink);
}

/* ============================================================
   SHARED utility
============================================================ */
[data-design="b"] .rf-meta {
  font-family: var(--b-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--b-muted);
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   All scoped to [data-design="b"]
============================================================ */
@media (max-width: 900px) {
  [data-design="b"] .rf-ambient-a {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: var(--b-gap-section-m) clamp(16px, 4vw, 32px);
  }
  [data-design="b"] .rf-ambient-a__motion {
    justify-self: stretch;
    max-width: 100%;
  }
  [data-design="b"] .rf-about__columns {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  [data-design="b"] .rf-footer__cols {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}
@media (max-width: 760px) {
  [data-design="b"] .rf-funnel__index {
    grid-template-columns: 1fr 1fr;
    font-size: 10px;
  }
  [data-design="b"] .rf-funnel__index li:nth-child(2),
  [data-design="b"] .rf-funnel__index li:nth-child(4) {
    border-right: 0;
  }
  [data-design="b"] .rf-funnel__grid { grid-template-columns: 1fr; }
  [data-design="b"] .rf-ambient-b { padding: var(--b-gap-section-m) 16px; }
  [data-design="b"] .rf-ambient-b__head { margin-bottom: 32px; }
  [data-design="b"] .rf-layer .rf-lead-label { font-size: 7px; }
  [data-design="b"] .rf-about__columns {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  [data-design="b"] .rf-footer__cols {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}
@media (max-width: 560px) {
  [data-design="b"] .rf-hero {
    min-height: 88vh;
    padding: 80px 16px 48px;
  }
  [data-design="b"] .rf-ambient-a { padding: var(--b-gap-section-s) 16px; }
  [data-design="b"] .rf-header__atmos { opacity: 0.14; }
  [data-design="b"] .rf-logo__name { font-size: 16px; }
  [data-design="b"] .rf-services { padding: var(--b-gap-section-s) 16px; }
  [data-design="b"] .rf-folio__body { padding-left: 16px; }
  [data-design="b"] .rf-about { padding: var(--b-gap-section-s) 16px; }
  [data-design="b"] .rf-interactive { padding: var(--b-gap-section-s) 16px; }
  [data-design="b"] .rf-footer { padding: 0 16px; }
}
@media (max-width: 380px) {
  [data-design="b"] .rf-funnel__sheet { padding: 20px 16px; }
  [data-design="b"] .rf-btn { padding: 10px 14px; font-size: 11px; letter-spacing: 0.1em; }
  [data-design="b"] .rf-funnel__index { grid-template-columns: 1fr; }
  [data-design="b"] .rf-funnel__index li { border-right: 0; }
}

@media (prefers-reduced-motion: reduce) {
  [data-design="b"] .rf-header__atmos line,
  [data-design="b"] .rf-header__atmos circle,
  [data-design="b"] .rf-header__dimlabel {
    animation: none;
    stroke-dashoffset: 0;
    opacity: 1;
  }
  [data-design="b"] .rf-drawer__sheet { transition: none; }
  [data-design="b"] .b-run {
    animation: none;
    stroke-dashoffset: 0;
  }
  [data-design="b"] .b-flow {
    animation: none;
    opacity: 1;
  }
  [data-design="b"] .rf-cta__rule { animation: none; transform: scaleX(1); }
  [data-design="b"] .rf-cta__shaft,
  [data-design="b"] .rf-cta__head { transition: none; }
  [data-design="b"] .exsys-pointer__counter-now,
  [data-design="b"] .exsys-pointer__chev,
  [data-design="b"] .exsys-pointer__bar-fill { animation: none; transition: none; }
  [data-design="b"] .rf-funnel__sheet,
  [data-design="b"] .rf-funnel__sheet.is-leaving,
  [data-design="b"] .rf-funnel__sheet.is-entering { transition: none; transform: none; opacity: 1; }
  [data-design="b"] .rf-stamp,
  [data-design="b"] .rf-issued-stamp { animation: none; }
  [data-design="b"] .rf-ambient-a__motion .rf-run { animation: none !important; stroke-dashoffset: 0 !important; }
  [data-design="b"] .rf-ambient-a__motion .rf-flow { animation-play-state: paused !important; }
  [data-design="b"] .rf-ambient-b__motion.is-active .rf-layer { animation: none; }
  [data-design="b"] .rf-layer polygon { transition: none; }
}

/* ============================================================
   MOBILE OVERFLOW GUARD
   Scoped to .dq-design per spec contract
============================================================ */
[data-design="b"].dq-design,
[data-design="b"] .dq-design {
  max-width: 100%;
  overflow-x: clip;
}
[data-design="b"].dq-design * {
  min-width: 0;
}
[data-design="b"].dq-design img,
[data-design="b"].dq-design svg:not([data-keep-size]) {
  max-width: 100%;
  height: auto;
}

/* Phase-3.4 hero visibility floor (forge_assemble) */
[data-design="b"] [data-mf-role="hero"] :is(h1,h2,p,.headline,.subtitle,.proof,[class*="headline"],[class*="subtitle"],[class*="proof"]),
[data-design="b"] [data-mf-role="cta"] { opacity: 1 !important; }