/* ============================================================
   Design B — Exposed Systems (construction-exposed-systems)
   Scoped: [data-design="b"]
   ============================================================ */

/* ---------- Design token block ---------- */
[data-design="b"] {
  --design-b-primary: #D62828;

  --ink:               #0E1115;
  --ink-2:             #2A2F37;
  --paper:             #F2EFE8;
  --paper-2:           #E8E3D8;
  --rule:              #C9C2B4;
  --guide:             #4A6FA5;
  --muted:             #6B6F76;
  --sys-structural:    #D62828;
  --sys-mechanical:    #1D6FB8;
  --sys-electrical:    #2A9D45;
  --sys-ventilation:   #F4B400;
  --critical:          #9E1212;
  --success:           var(--sys-electrical);

  --font-display: "Inter Tight", "Helvetica Now Display", -apple-system, system-ui, sans-serif;
  --font-body:    "Inter", -apple-system, system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --font-stamp:   "Times New Roman", Times, serif;

  --t-meta:  11px;
  --t-cap:   13px;
  --t-body:  16px;
  --t-lead:  20px;
  --t-h3:    24px;
  --t-h2:    36px;
  --t-h1:    64px;
  --t-hero:  clamp(42px, 5.8vw, 80px);

  --gap-hair:       1px;
  --gap-tight:      4px;
  --gap-x:          8px;
  --gap-row:        16px;
  --gap-block:      24px;
  --gap-stack:      48px;
  --gap-section:    96px;
  --gap-section-m:  64px;
  --gap-section-s:  48px;

  --ease-snap:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-draft: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:   160ms;
  --dur-base:   320ms;
  --dur-draw:   1400ms;

  --r-0: 0;
  --r-1: 2px;
  --r-2: 4px;

  --elev-flat:   none;
  --elev-ring:   0 0 0 1px var(--rule);
  --elev-card:   0 0 0 1px var(--rule), 0 1px 0 var(--rule);
  --elev-drawer: 0 0 0 1px var(--ink), 0 24px 64px -32px rgba(14,17,21,0.45);

  box-sizing: border-box;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}

[data-design="b"] *, [data-design="b"] *::before, [data-design="b"] *::after {
  box-sizing: inherit;
}

/* ---------- E1: Header ---------- */
[data-design="b"] .rf-header {
  position: relative;
  background: var(--paper);
  border-bottom: 1px solid var(--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(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
}
[data-design="b"] .rf-logo__mark {
  display: inline-flex;
  flex-shrink: 0;
}
[data-design="b"] .rf-burger {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 12px;
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: var(--r-0);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  transition: background var(--dur-fast) var(--ease-snap);
}
[data-design="b"] .rf-burger__line {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform var(--dur-fast) var(--ease-snap);
}
[data-design="b"] .rf-burger:hover { background: var(--ink); }
[data-design="b"] .rf-burger:hover .rf-burger__line { background: var(--paper); }
[data-design="b"] .rf-burger:focus-visible { outline: 2px solid var(--sys-structural); outline-offset: 2px; }

/* Atmospheric line-draw */
[data-design="b"] .rf-header__atmos {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.18;
}
[data-design="b"] .rf-header__atmos line,
[data-design="b"] .rf-header__atmos circle {
  fill: var(--ink);
  stroke: var(--ink);
  stroke-width: 1;
  stroke-linecap: square;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: b-header-draw 28s var(--ease-draft) infinite;
}
[data-design="b"] .rf-header__atmos circle { fill: var(--ink); stroke: none; }
[data-design="b"] .rf-header__dim { stroke: var(--sys-structural); }
[data-design="b"] .rf-header__dimlabel {
  fill: var(--sys-structural);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  opacity: 0;
  animation: b-header-label 28s var(--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(14,17,21,0.18);
  z-index: 50;
  display: flex;
  justify-content: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--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(--paper);
  box-shadow: var(--elev-drawer);
  padding: clamp(20px, 4vw, 40px);
  transform: translateX(24px);
  transition: transform var(--dur-base) var(--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(--ink);
  padding-bottom: 10px;
  font-family: var(--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(--ink);
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: -0.01em;
}
[data-design="b"] .rf-drawer__nav .rf-nav-a::before {
  content: attr(data-no);
  color: var(--guide);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
[data-design="b"] .rf-drawer__nav .rf-nav-a:hover { color: var(--sys-structural); }
[data-design="b"] .rf-drawer__divider {
  height: 1px;
  background: var(--rule);
}
[data-design="b"] .rf-drawer__cta {
  align-self: flex-start;
  text-decoration: none;
}
[data-design="b"] .rf-drawer__phone {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-decoration: none;
  padding: 8px 0;
  display: block;
}
[data-design="b"] .rf-drawer__phone:hover { color: var(--sys-structural); }
[data-design="b"] .rf-drawer__close {
  align-self: flex-start;
  margin-top: auto;
  background: transparent;
  border: 1px solid var(--ink);
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  cursor: pointer;
  border-radius: var(--r-0);
  min-height: 44px;
}
[data-design="b"] .rf-drawer__close:hover { background: var(--ink); color: var(--paper); }

/* ---------- E3: Hero — unique animated roof-section backdrop ---------- */
[data-design="b"] .rf-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: clamp(48px, 8vh, 96px) clamp(20px, 5vw, 80px) clamp(56px, 8vh, 96px);
  background: var(--paper-2);
  overflow: hidden;
  border-bottom: 1px solid var(--rule);
}

/* Animated backdrop — ONE layer, perceptible sustained ambient motion */
[data-design="b"] .rf-hero__atmos {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}
[data-design="b"] .rf-hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Roof outline — draws in on load */
[data-design="b"] .b-roof-outline {
  stroke: var(--rule);
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 3200;
  stroke-dashoffset: 3200;
  animation: b-hero-outline 2.2s var(--ease-draft) forwards, b-hero-outline-hold 8s 2.2s ease-in-out infinite;
}
@keyframes b-hero-outline {
  to { stroke-dashoffset: 0; }
}
@keyframes b-hero-outline-hold {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 0.9; }
}

/* Ridge line — draws across after outline */
[data-design="b"] .b-ridge {
  stroke: var(--sys-structural);
  stroke-width: 2.5;
  stroke-linecap: square;
  opacity: 0;
  animation: b-hero-ridge 1s 1.8s var(--ease-snap) forwards, b-hero-ridge-ambient 6s 2.8s ease-in-out infinite;
}
@keyframes b-hero-ridge {
  0% { opacity: 0; }
  100% { opacity: 1; }
}
@keyframes b-hero-ridge-ambient {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

/* Deck fill — fades in after outline */
[data-design="b"] .b-deck-fill {
  animation: b-hero-deck 1.6s 1.2s var(--ease-snap) forwards;
}
@keyframes b-hero-deck {
  from { opacity: 0; }
  to   { opacity: 0.25; }
}

/* Shingle course lines — lay in bottom to top, staggered */
[data-design="b"] .b-course {
  stroke: var(--ink);
  stroke-width: 1;
  stroke-linecap: square;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  opacity: 0;
}
[data-design="b"] .b-course--1 { animation: b-course-in 0.9s 0.5s var(--ease-draft) forwards, b-course-breathe 7s 1.6s ease-in-out infinite; }
[data-design="b"] .b-course--2 { animation: b-course-in 0.9s 0.65s var(--ease-draft) forwards, b-course-breathe 7s 1.75s ease-in-out infinite; }
[data-design="b"] .b-course--3 { animation: b-course-in 0.9s 0.8s var(--ease-draft) forwards, b-course-breathe 7s 1.9s ease-in-out infinite; }
[data-design="b"] .b-course--4 { animation: b-course-in 0.9s 0.95s var(--ease-draft) forwards, b-course-breathe 7s 2.05s ease-in-out infinite; }
[data-design="b"] .b-course--5 { animation: b-course-in 0.9s 1.1s var(--ease-draft) forwards, b-course-breathe 7s 2.2s ease-in-out infinite; }
[data-design="b"] .b-course--6 { animation: b-course-in 0.9s 1.25s var(--ease-draft) forwards, b-course-breathe 7s 2.35s ease-in-out infinite; }
[data-design="b"] .b-course--7 { animation: b-course-in 0.9s 1.4s var(--ease-draft) forwards, b-course-breathe 7s 2.5s ease-in-out infinite; }
[data-design="b"] .b-course--8 { animation: b-course-in 0.9s 1.55s var(--ease-draft) forwards, b-course-breathe 7s 2.65s ease-in-out infinite; }
@keyframes b-course-in {
  0% { stroke-dashoffset: 1000; opacity: 0; }
  100% { stroke-dashoffset: 0; opacity: 0.55; }
}
@keyframes b-course-breathe {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 0.7; }
}

/* Dimension leaders */
[data-design="b"] .b-dim-lead {
  stroke: var(--sys-structural);
  stroke-width: 1;
  stroke-dasharray: 80;
  stroke-dashoffset: 80;
  animation: b-dim-draw 0.6s 2s var(--ease-draft) forwards;
}
[data-design="b"] .b-dim-lead--ridge {
  animation-delay: 2.2s;
}
[data-design="b"] .b-dim-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  fill: var(--sys-structural);
  opacity: 0;
  animation: b-dim-fade 0.4s 2.4s var(--ease-snap) forwards;
}
[data-design="b"] .b-dim-label--ridge { animation-delay: 2.6s; }
[data-design="b"] .b-dim-label--eave  {
  font-size: 8px;
  fill: var(--muted);
  opacity: 0;
  animation: b-dim-fade 0.4s 2.4s var(--ease-snap) forwards;
}
@keyframes b-dim-draw { to { stroke-dashoffset: 0; } }
@keyframes b-dim-fade { to { opacity: 0.75; } }

/* Structural annotation */
[data-design="b"] .b-annotation--structural {
  stroke: var(--sys-structural);
  stroke-width: 0.6;
  stroke-dasharray: 4 4;
  opacity: 0;
  animation: b-dim-fade 0.5s 2.4s ease forwards;
}
[data-design="b"] .b-annotation-label--s {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  fill: var(--sys-structural);
  opacity: 0;
  animation: b-dim-fade 0.4s 2.6s ease forwards;
}

/* Eave line */
[data-design="b"] .b-eave {
  stroke: var(--ink);
  stroke-width: 1.5;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: b-course-in 1.2s 0.3s var(--ease-draft) forwards;
}

/* Ambient breath overlay — sustained perceptible motion */
[data-design="b"] .b-hero__breath {
  animation: b-hero-breath 10s 2.5s ease-in-out infinite;
}
@keyframes b-hero-breath {
  0%, 100% { opacity: 0; }
  30%, 70%  { opacity: 0.06; }
}

/* Hero copy — opacity:1 at first paint */
[data-design="b"] .rf-hero__copy {
  position: relative;
  z-index: 2;
  max-width: 780px;
}
[data-design="b"] .rf-hero__meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
  margin: 0 0 20px;
  opacity: 1;
}
[data-design="b"] .rf-hero__h1 {
  font-family: var(--font-display);
  font-size: var(--t-hero);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--ink);
  margin: 0 0 20px;
  max-width: 14ch;
  opacity: 1;
}
[data-design="b"] .rf-hero__subtitle {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0 0 12px;
  opacity: 1;
}
[data-design="b"] .rf-hero__proof {
  font-family: var(--font-mono);
  font-size: var(--t-cap);
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 36px;
  opacity: 1;
}
[data-design="b"] .rf-hero__ctas {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
[data-design="b"] .rf-hero__phone-secondary {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink-2);
  text-decoration: none;
  padding: 8px 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-bottom: 1px solid var(--rule);
}
[data-design="b"] .rf-hero__phone-secondary:hover { color: var(--ink); border-color: var(--ink); }

/* ---------- E2: CTA ---------- */
[data-design="b"] .rf-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--r-1);
  border: none;
  cursor: pointer;
  min-height: 44px;
  transition: transform var(--dur-fast) var(--ease-snap), background var(--dur-fast) var(--ease-snap);
  overflow: hidden;
}
[data-design="b"] .rf-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--ink);
  border-radius: var(--r-1);
  pointer-events: none;
}
[data-design="b"] .rf-cta__arrow { overflow: visible; }
[data-design="b"] .rf-cta__shaft {
  stroke: var(--paper);
  stroke-width: 1.5;
  fill: none;
  stroke-dasharray: 26;
  stroke-dashoffset: 8;
  transition: stroke-dashoffset var(--dur-base) var(--ease-snap);
}
[data-design="b"] .rf-cta__head {
  stroke: var(--paper);
  stroke-width: 1.5;
  fill: none;
  stroke-linejoin: miter;
  transform: translateX(0);
  transition: transform var(--dur-base) var(--ease-snap);
}
[data-design="b"] .rf-cta__rule {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 10px;
  height: 1px;
  background: var(--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(--sys-structural); outline-offset: 3px; }
[data-design="b"] .rf-cta--footer { margin-top: 16px; }

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

/* ---------- E6: Pointer — immediate preceding sibling of #funnel ---------- */
[data-design="b"] [data-mf-role="pointer"] {
  display: block;
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--ink);
  padding: 18px clamp(20px, 5vw, 80px);
  min-height: 72px; /* HARD GATE: >8px; target ≥12px; we use 72px */
  opacity: 1;
}
[data-design="b"] .exsys-pointer__track {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 10px;
}
[data-design="b"] .exsys-pointer__label {
  color: var(--muted);
  flex-shrink: 0;
}
[data-design="b"] .exsys-pointer__counter {
  font-size: 12px;
  letter-spacing: 0.16em;
  opacity: 0.75;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
[data-design="b"] .exsys-pointer__counter-now {
  display: inline-block;
  min-width: 1ch;
  animation: b-pointer-tick 320ms ease-out;
}
[data-design="b"] .exsys-pointer__bar {
  position: relative;
  flex: 1;
  height: 2px;
  background: currentColor;
  opacity: 0.15;
  border-radius: 1px;
  overflow: hidden;
}
[data-design="b"] .exsys-pointer__bar-fill {
  position: absolute;
  inset: 0;
  width: var(--b-pointer-progress, 20%);
  background: var(--sys-structural);
  opacity: 1;
  transition: width 480ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
[data-design="b"] .exsys-pointer__chev {
  font-size: 18px;
  opacity: 0.6;
  animation: b-pointer-chev 4s ease-in-out infinite;
  flex-shrink: 0;
}
/* Roofline drawn below the track bar */
[data-design="b"] .exsys-pointer__roofline {
  display: block;
  width: 100%;
  height: 28px;
  overflow: visible;
}
[data-design="b"] .exsys-pointer__rline {
  stroke: var(--rule);
  stroke-width: 1;
  fill: none;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: b-pointer-rline 1.4s var(--ease-draft) forwards, b-pointer-rline-fade 5s 1.4s ease-in-out infinite;
}
[data-design="b"] .exsys-pointer__rline--r { animation-delay: 0.3s, 1.7s; }
[data-design="b"] .exsys-pointer__rline--eave {
  stroke: var(--sys-structural);
  stroke-width: 1.5;
  animation-delay: 0.5s, 1.9s;
}
@keyframes b-pointer-rline {
  to { stroke-dashoffset: 0; }
}
@keyframes b-pointer-rline-fade {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}
@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: 0.45; }
  50%      { transform: translateX(4px); opacity: 0.9; }
}

/* ---------- E5: Funnel ---------- */
[data-design="b"] .rf-interactive {
  padding: var(--gap-section) clamp(20px, 5vw, 80px);
  background: var(--paper);
  border-top: 1px solid var(--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(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 12px;
  text-transform: uppercase;
}
[data-design="b"] .rf-funnel__masthead .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--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(--ink);
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.1em;
}
[data-design="b"] .rf-funnel__index li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 16px 10px;
  color: var(--muted);
  border-right: 1px solid var(--rule);
}
[data-design="b"] .rf-funnel__index li:last-child { border-right: 0; }
[data-design="b"] .rf-funnel__index li span { color: var(--guide); }
[data-design="b"] .rf-funnel__index li.is-current { color: var(--ink); background: var(--paper-2); }
[data-design="b"] .rf-funnel__index li.is-done { color: var(--ink); }
[data-design="b"] .rf-funnel__index li.is-done::after { content: "✓"; margin-left: auto; color: var(--sys-electrical); }

[data-design="b"] .rf-funnel {
  position: relative;
  min-height: 400px;
}
[data-design="b"] .rf-funnel__sheet {
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 32px clamp(20px, 3vw, 40px);
  transition: opacity var(--dur-base) var(--ease-snap), transform var(--dur-base) var(--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(--ink);
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
[data-design="b"] .rf-funnel__title .rf-funnel__sheet-no { color: var(--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(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 16px;
}
[data-design="b"] .rf-field__req { color: var(--sys-structural); }
[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(--rule);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-snap), background var(--dur-fast) var(--ease-snap);
  font-size: 15px;
  min-height: 44px;
  border-radius: var(--r-1);
}
[data-design="b"] .rf-funnel__choice:hover { border-color: var(--ink); }
[data-design="b"] .rf-funnel__choice input { accent-color: var(--sys-structural); }
[data-design="b"] .rf-funnel__choice:has(input:checked) { border-color: var(--ink); background: var(--paper-2); }

[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-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
[data-design="b"] .rf-input {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--ink);
  border-radius: var(--r-1);
  outline: none;
  transition: border-color var(--dur-fast) var(--ease-snap);
}
[data-design="b"] .rf-input--textarea { resize: vertical; min-height: 80px; }
[data-design="b"] .rf-input:focus-visible { border-color: var(--sys-structural); box-shadow: inset 0 0 0 1px var(--sys-structural); }

[data-design="b"] .rf-funnel__actions {
  display: flex;
  gap: 16px;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--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(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: var(--r-1);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-snap), background var(--dur-fast) var(--ease-snap);
  border: 1px solid var(--ink);
  min-height: 44px;
}
[data-design="b"] .rf-btn--primary { background: var(--ink); color: var(--paper); }
[data-design="b"] .rf-btn--primary:hover { background: #000; }
[data-design="b"] .rf-btn--secondary { background: var(--paper); color: var(--ink); }
[data-design="b"] .rf-btn--secondary:hover { background: var(--paper-2); }
[data-design="b"] .rf-btn:active { transform: scale(0.985); }
[data-design="b"] .rf-btn:focus-visible { outline: 2px solid var(--sys-structural); outline-offset: 2px; }

[data-design="b"] .rf-stamp {
  display: inline-flex;
  padding: 6px 10px;
  border: 1.5px solid currentColor;
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transform: rotate(-2deg);
  animation: b-stamp 200ms var(--ease-snap);
}
[data-design="b"] .rf-stamp--field-verified { color: var(--sys-mechanical); }
[data-design="b"] .rf-stamp--in-review      { color: var(--sys-ventilation); }
[data-design="b"] .rf-stamp--approved       { color: var(--sys-structural); }

[data-design="b"] .rf-funnel__issued {
  margin-top: 32px;
  padding: 40px;
  border: 2px solid var(--ink);
  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(--sys-structural);
  color: var(--sys-structural);
  font-family: var(--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(--ease-snap);
}
[data-design="b"] .rf-funnel__thanks {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}
[data-design="b"] .rf-funnel__thanks a { color: var(--sys-structural); }
[data-design="b"] .rf-funnel__emergency-note {
  margin-top: 16px;
  padding: 12px 16px;
  border-left: 3px solid var(--sys-structural);
  background: var(--paper-2);
  font-size: 15px;
  line-height: 1.5;
}
[data-design="b"] .rf-funnel__emergency-note[hidden] { display: none; }
[data-design="b"] .rf-funnel__emergency-link {
  color: var(--sys-structural);
  font-family: var(--font-mono);
  font-weight: 600;
}

@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); }
}

/* ---------- E3: Ambient A — Roof systems section ---------- */
[data-design="b"] .rf-ambient-a {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  padding: var(--gap-section) clamp(20px, 5vw, 80px);
  align-items: start;
  background: var(--paper);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
[data-design="b"] .rf-ambient-a__copy .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 24px;
  text-transform: uppercase;
}
[data-design="b"] .rf-ambient-a__copy .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--ink);
}
[data-design="b"] .rf-ambient-a__copy .rf-body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 48ch;
}
[data-design="b"] .rf-services-list {
  margin: 16px 0 0;
  padding: 0 0 0 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
}
[data-design="b"] .rf-services-list li {
  font-family: var(--font-mono);
  font-size: var(--t-cap);
  letter-spacing: 0.06em;
  color: var(--ink-2);
  text-transform: uppercase;
  padding-left: 12px;
  border-left: 2px solid var(--sys-structural);
}
[data-design="b"] .rf-legend {
  list-style: none;
  padding: 24px 0 0;
  margin: 32px 0 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: repeat(2, max-content);
  gap: 12px 32px;
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
[data-design="b"] .rf-legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}
[data-design="b"] .rf-legend__sw {
  width: 14px;
  height: 14px;
  border: 1px solid var(--ink);
  display: inline-block;
}
[data-design="b"] .rf-legend__sw--s { background: var(--sys-structural); }
[data-design="b"] .rf-legend__sw--m { background: var(--sys-mechanical); }
[data-design="b"] .rf-legend__sw--e { background: var(--sys-electrical); }
[data-design="b"] .rf-legend__sw--v { background: var(--sys-ventilation); }

[data-design="b"] .rf-ambient-a__motion {
  width: 100%;
  max-width: 480px;
  justify-self: end;
  background: var(--paper-2);
  border: 1px solid var(--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(--ink); stroke-width: 1.5; }
[data-design="b"] .rf-section__floor   { stroke: var(--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 .rf-run--s { stroke: var(--sys-structural); }
[data-design="b"] .rf-ambient-a__motion .rf-run--m { stroke: var(--sys-mechanical); }
[data-design="b"] .rf-ambient-a__motion .rf-run--e { stroke: var(--sys-electrical); }
[data-design="b"] .rf-ambient-a__motion .rf-run--v { stroke: var(--sys-ventilation); }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-run {
  animation: b-amba-draw var(--dur-draw) var(--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-flow { fill: var(--ink); opacity: 0; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--s { fill: var(--sys-structural); opacity: 1; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--m { fill: var(--sys-mechanical); opacity: 1; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--e { fill: var(--sys-electrical); opacity: 1; }
[data-design="b"] .rf-ambient-a__motion.is-active .rf-flow--v { fill: var(--sys-ventilation); opacity: 1; }
[data-design="b"] .rf-section__dim       { stroke: var(--ink); stroke-width: 1; }
[data-design="b"] .rf-section__dim-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.12em;
}
@keyframes b-amba-draw { to { stroke-dashoffset: 0; } }

/* ---------- E4: Ambient B — Exploded roof assembly ---------- */
[data-design="b"] .rf-ambient-b {
  padding: var(--gap-section) clamp(20px, 5vw, 80px);
  background: var(--paper-2);
  border-top: 1px solid var(--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(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 16px;
  text-transform: uppercase;
}
[data-design="b"] .rf-ambient-b__head .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 20px;
  color: var(--ink);
}
[data-design="b"] .rf-ambient-b__head .rf-body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}
[data-design="b"] .rf-ambient-b__motion {
  margin: 0;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--rule);
  overflow: hidden;
}
[data-design="b"] .rf-ambient-b__motion svg {
  width: 100%;
  height: auto;
  display: block;
  color: var(--ink);
}
[data-design="b"] .rf-layer polygon {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1.5;
  transform-origin: 50% 50%;
  transition: transform var(--dur-base) var(--ease-snap);
}
[data-design="b"] .rf-layer .rf-lead {
  stroke: var(--sys-structural);
  stroke-width: 1;
  stroke-dasharray: 70;
  stroke-dashoffset: 70;
  transition: stroke-dashoffset var(--dur-base) var(--ease-draft);
}
[data-design="b"] .rf-layer .rf-lead-label {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  fill: var(--ink);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-snap);
}
[data-design="b"] .rf-ambient-b__motion.is-active .rf-layer {
  animation: b-ambb-lift 20s var(--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); }
}

/* Process phases */
[data-design="b"] .rf-process-phases {
  margin-top: 56px;
}
[data-design="b"] .rf-phases {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}
[data-design="b"] .rf-phase {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}
[data-design="b"] .rf-phase__no {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.1em;
  color: var(--sys-structural);
}
[data-design="b"] .rf-phase__label {
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-2);
}

/* ---------- Warranties ---------- */
[data-design="b"] .rf-warranties {
  padding: var(--gap-section) clamp(20px, 5vw, 80px);
  background: var(--paper);
  border-top: 1px solid var(--rule);
}
[data-design="b"] .rf-warranties__head {
  max-width: 60ch;
  margin: 0 0 48px;
}
[data-design="b"] .rf-warranties__head .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 16px;
  text-transform: uppercase;
}
[data-design="b"] .rf-warranties__head .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0;
  color: var(--ink);
}
[data-design="b"] .rf-warranties__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
[data-design="b"] .rf-sheet {
  border: 1px solid var(--rule);
  background: var(--paper-2);
}
[data-design="b"] .rf-sheet__title-block {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 20px;
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--paper);
}
[data-design="b"] .rf-sheet__no { color: var(--muted); }
[data-design="b"] .rf-warranties__item { padding: 0; }
[data-design="b"] .rf-warranties__item .rf-body-sm {
  padding: 20px 20px 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-2);
}
[data-design="b"] .rf-warranties__item .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 0 20px 20px;
}
[data-design="b"] .rf-trust-list {
  list-style: none;
  padding: 20px 20px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
[data-design="b"] .rf-trust-list li {
  font-family: var(--font-mono);
  font-size: var(--t-cap);
  letter-spacing: 0.06em;
  color: var(--ink-2);
  text-transform: uppercase;
  padding-left: 12px;
  border-left: 2px solid var(--sys-structural);
}

/* ---------- Repeated CTA ---------- */
[data-design="b"] .rf-repeat-cta {
  padding: var(--gap-section-s) clamp(20px, 5vw, 80px);
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}
[data-design="b"] .rf-repeat-cta .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}
[data-design="b"] .rf-repeat-cta__copy {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 56ch;
  margin: 0;
}

/* ---------- About ---------- */
[data-design="b"] .rf-about {
  padding: var(--gap-section) clamp(20px, 5vw, 80px);
  background: var(--paper);
  border-top: 1px solid var(--rule);
}
[data-design="b"] .rf-about__sheet {
  border: 1px solid var(--rule);
}
[data-design="b"] .rf-about__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding: 32px;
}
[data-design="b"] .rf-about__col .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}
[data-design="b"] .rf-about__col .rf-body-sm {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-2);
}

/* ---------- Footer ---------- */
[data-design="b"] .rf-footer {
  background: var(--paper);
  padding: 0 clamp(20px, 5vw, 80px);
}
[data-design="b"] .rf-footer__top-rule { height: 1px; background: var(--ink); }
[data-design="b"] .rf-footer__body {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding: 40px 0;
}
[data-design="b"] .rf-footer__col .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}
[data-design="b"] .rf-footer__text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
}
[data-design="b"] .rf-footer__phone {
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  display: block;
  margin-bottom: 4px;
  min-height: 44px;
  line-height: 44px;
}
[data-design="b"] .rf-footer__phone:hover { color: var(--sys-structural); }
[data-design="b"] .rf-footer__mid-rule { height: 1px; background: var(--rule); }
[data-design="b"] .rf-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.06em;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 8px;
}
[data-design="b"] .rf-footer__bottom-rule { height: 1px; background: var(--ink); }

/* ---------- Shared helpers ---------- */
[data-design="b"] .rf-meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}
[data-design="b"] .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--ink);
}
[data-design="b"] .rf-body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}
[data-design="b"] .rf-body p { margin: 0 0 16px; }
[data-design="b"] .rf-body p:last-child { margin-bottom: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  [data-design="b"] .rf-ambient-a { grid-template-columns: 1fr; gap: 40px; padding: var(--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__cols { grid-template-columns: 1fr; gap: 24px; }
  [data-design="b"] .rf-footer__body { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  [data-design="b"] .rf-funnel__index { grid-template-columns: repeat(3, 1fr); }
  [data-design="b"] .rf-funnel__index li:nth-child(3) { border-right: 0; }
  [data-design="b"] .rf-funnel__grid { grid-template-columns: 1fr; }
  [data-design="b"] .rf-funnel__actions { flex-wrap: wrap; }
  [data-design="b"] .rf-funnel__actions [data-stamp] { margin-left: 0; order: -1; }
  [data-design="b"] .rf-warranties__grid { grid-template-columns: 1fr; }
  [data-design="b"] .exsys-pointer__label { display: none; }
}
@media (max-width: 560px) {
  [data-design="b"] .rf-header__atmos { opacity: 0.10; }
  [data-design="b"] .rf-logo__name { font-size: 15px; }
  [data-design="b"] .rf-ambient-b { padding: var(--gap-section-s) 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-hero__h1 { max-width: 100%; }
  [data-design="b"] .rf-hero__ctas { flex-direction: column; align-items: flex-start; }
  [data-design="b"] .rf-funnel__index { grid-template-columns: 1fr 1fr; }
  [data-design="b"] .rf-funnel__index li:nth-child(2n) { border-right: 0; }
  [data-design="b"] .rf-footer__body { grid-template-columns: 1fr; }
}
@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; }
}

/* ---------- Reduced motion ---------- */
@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-roof-outline,
  [data-design="b"] .b-ridge,
  [data-design="b"] .b-deck-fill,
  [data-design="b"] .b-course,
  [data-design="b"] .b-eave { animation: none; stroke-dashoffset: 0; opacity: 0.55; }
  [data-design="b"] .b-dim-lead,
  [data-design="b"] .b-dim-label,
  [data-design="b"] .b-annotation--structural,
  [data-design="b"] .b-annotation-label--s { animation: none; stroke-dashoffset: 0; opacity: 0.75; }
  [data-design="b"] .b-hero__breath { animation: none; opacity: 0.03; }
  [data-design="b"] .b-deck-fill { opacity: 0.25; }

  [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"] .exsys-pointer__rline { animation: none; stroke-dashoffset: 0; opacity: 0.6; }

  [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; }
}

/* ============================================================
   HARD MOBILE OVERFLOW GUARDS (append-at-bottom per contract)
   ============================================================ */
[data-design="b"].dq-design,
[data-design="b"] .dq-design { max-width: 100%; overflow-x: clip; }
[data-design="b"] * { min-width: 0; }
[data-design="b"] img,
[data-design="b"] 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; }