/* ═══════════════════════════════════════════════════════════
   CATENARY design — Design-B slice
   Noble H. Brown Roofing & Gutters
   All selectors scoped: [data-design="b"]
   Token prefix: --design-b-* + --cat-* remapped to b vars
   ════════════════════════════════════════════════════════════ */

/* ── Token root on the design-b block ── */
[data-design="b"] {
  --design-b-primary: #E9601F;

  /* Color tokens */
  --cat-bg:        #F2EFE7;
  --cat-surface:   #FAF8F3;
  --cat-ink:       #1A1816;
  --cat-graphite:  #44413C;
  --cat-stone:     #6B6760;
  --cat-hairline:  #4A4742;
  --cat-mist:      #D7D2C6;
  --cat-orange:    #E9601F;
  --cat-cyan:      #5C8AA8;
  --cat-red:       #BE2D1F;
  --cat-olive:     #5F6748;

  /* Typography */
  --cat-font-display: "Inter Tight", "Helvetica Neue", -apple-system, system-ui, sans-serif;
  --cat-font-body:    "Inter", -apple-system, system-ui, sans-serif;
  --cat-font-mono:    ui-monospace, "JetBrains Mono", "DIN Mono", "Roboto Mono", Menlo, monospace;

  /* Spacing */
  --cat-s-bolt:   4px;
  --cat-s-rivet:  8px;
  --cat-s-stud:   12px;
  --cat-s-joist:  16px;
  --cat-s-beam:   24px;
  --cat-s-bay:    36px;
  --cat-s-span:   60px;
  --cat-s-frame:  96px;
  --cat-s-grid:   144px;

  /* Motion */
  --cat-d-quick:  140ms;
  --cat-d-base:   220ms;
  --cat-d-settle: 520ms;
  --cat-d-span:   18s;
  --cat-ease-settle:   cubic-bezier(.22,.61,.36,1);
  --cat-ease-register: cubic-bezier(.5,.05,.5,1);
  --cat-ease-unfurl:   cubic-bezier(.16,1,.3,1);

  /* Radii */
  --cat-r-none: 0px;
  --cat-r-edge: 2px;
  --cat-r-pill: 999px;

  /* Elevation */
  --cat-elev-flat: none;
  --cat-elev-ring: inset 0 0 0 1px var(--cat-hairline);
}

/* ── Base reset ── */
[data-design="b"] *,
[data-design="b"] *::before,
[data-design="b"] *::after {
  box-sizing: border-box;
}

[data-design="b"] {
  background: var(--cat-bg);
  color: var(--cat-ink);
  font-family: var(--cat-font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ════════════════════════════════════════════════════════════
   E1 — HEADER (catenary chain)
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-header {
  position: sticky; top: 0; z-index: 40;
  background: var(--cat-bg);
  border-bottom: 1px solid var(--cat-mist);
  overflow: hidden;
}

[data-design="b"] .rf-chain {
  position: absolute; inset: 0; height: 100%;
  pointer-events: none;
}
[data-design="b"] .rf-chain svg { width: 100%; height: 100%; display: block; }

[data-design="b"] .rf-chain__curve {
  fill: none;
  stroke: var(--cat-hairline);
  stroke-width: .75;
  vector-effect: non-scaling-stroke;
  transform-origin: 50% 0%;
  transform-box: fill-box;
  animation: cat-chain-settle var(--cat-d-span) var(--cat-ease-settle) infinite alternate;
}
[data-design="b"] .rf-chain__curve--2 {
  stroke: color-mix(in oklab, var(--cat-hairline), transparent 35%);
  animation-duration: 22s; animation-delay: -6s;
}
[data-design="b"] .rf-chain__curve--3 {
  stroke: color-mix(in oklab, var(--cat-hairline), transparent 60%);
  animation-duration: 31s; animation-delay: -12s;
}
[data-design="b"] .rf-chain__pin { fill: var(--cat-orange); }

@keyframes cat-chain-settle {
  0%   { transform: scaleY(0.96) translateY(0); }
  50%  { transform: scaleY(1.04) translateY(2px); }
  100% { transform: scaleY(0.98) translateY(-1px); }
}

[data-design="b"] .rf-header__bar {
  position: relative; z-index: 2;
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--cat-s-stud) clamp(16px, 4vw, 36px);
  max-width: 1440px; margin-inline: auto;
  min-height: 56px;
}

[data-design="b"] .rf-logo { text-decoration: none; color: var(--cat-ink); }
[data-design="b"] .rf-logo__mark {
  font-family: var(--cat-font-display);
  font-size: clamp(14px, 2.2vw, 18px);
  font-weight: 600;
  letter-spacing: -0.01em;
}

[data-design="b"] .rf-burger {
  background: transparent;
  border: 1px solid var(--cat-hairline);
  width: 44px; height: 44px;
  padding: 0; cursor: pointer;
  display: grid; place-content: center; gap: 4px;
  border-radius: var(--cat-r-edge);
  transition: border-color var(--cat-d-quick) var(--cat-ease-register);
  flex-shrink: 0;
}
[data-design="b"] .rf-burger span {
  display: block; width: 18px; height: 1px;
  background: var(--cat-ink);
  transition:
    transform var(--cat-d-base) var(--cat-ease-register),
    opacity var(--cat-d-quick) linear;
}
[data-design="b"] .rf-burger:hover { border-color: var(--cat-orange); }
[data-design="b"] .rf-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
[data-design="b"] .rf-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
[data-design="b"] .rf-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* Drawer */
[data-design="b"] .rf-drawer {
  position: fixed;
  inset: 56px 0 0 0;
  background: var(--cat-bg);
  border-top: 1px solid var(--cat-hairline);
  z-index: 39;
  overflow-y: auto;
}
[data-design="b"] .rf-drawer[hidden] { display: none; }

[data-design="b"] .rf-drawer__inner {
  max-width: 1440px; margin-inline: auto;
  padding: var(--cat-s-frame) clamp(16px, 4vw, 36px);
  display: flex; flex-direction: column; gap: var(--cat-s-beam);
}
[data-design="b"] .rf-drawer a {
  font-family: var(--cat-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: clamp(20px, 4vw, 30px);
  color: var(--cat-ink);
  text-decoration: none;
  padding: var(--cat-s-stud) 0;
  border-bottom: 1px solid var(--cat-mist);
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--cat-s-beam);
  align-items: baseline;
  min-height: 44px;
}
[data-design="b"] .rf-drawer a::before {
  content: attr(data-num);
  color: var(--cat-orange);
  font-size: .72em;
}
[data-design="b"] .rf-drawer__phone {
  color: var(--cat-orange) !important;
  font-size: clamp(18px, 3.5vw, 26px) !important;
}
[data-design="b"] .rf-drawer__cta {
  margin-top: var(--cat-s-beam);
  display: inline-flex !important;
  grid-template-columns: none !important;
}
[data-design="b"] .rf-drawer__cta::before { content: "" !important; display: none !important; }

/* ════════════════════════════════════════════════════════════
   HERO — E3 animated backdrop + content
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-hero {
  position: relative;
  background: var(--cat-ink);
  min-height: clamp(520px, 80vh, 880px);
  display: flex; align-items: center;
  overflow: hidden;
  isolation: isolate;
}

[data-design="b"] .rf-hero__backdrop {
  position: absolute; inset: 0; z-index: 0;
  pointer-events: none;
}
[data-design="b"] .rf-roofline-svg {
  width: 100%; height: 100%;
  display: block;
}

/* Roofline draw animation */
[data-design="b"] .b-ridge-left,
[data-design="b"] .b-ridge-right {
  stroke: var(--cat-graphite);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 1600;
  stroke-dashoffset: 0;
  animation: b-ridge-draw 2s var(--cat-ease-unfurl) forwards,
             b-ridge-breathe 8s var(--cat-ease-settle) 2s infinite alternate;
}
[data-design="b"] .b-ridge-right {
  animation-delay: .4s, 2.4s;
}

@keyframes b-ridge-draw {
  from { stroke-dashoffset: 1600; }
  to   { stroke-dashoffset: 0; }
}
@keyframes b-ridge-breathe {
  0%   { opacity: 0.5; }
  50%  { opacity: 0.75; }
  100% { opacity: 0.55; }
}

[data-design="b"] .b-ridge-crown {
  fill: var(--cat-orange);
  animation: b-crown-pulse 6s var(--cat-ease-settle) infinite alternate;
}
@keyframes b-crown-pulse {
  0%, 100% { r: 4; opacity: 0.8; }
  50%       { r: 6; opacity: 1; }
}

[data-design="b"] .b-roof-plane {
  animation: b-plane-breathe 10s var(--cat-ease-settle) infinite alternate;
}
@keyframes b-plane-breathe {
  0%   { opacity: 0.6; }
  50%  { opacity: 0.85; }
  100% { opacity: 0.65; }
}

/* Course-lay lines draw in sequentially */
[data-design="b"] .b-course {
  stroke: var(--cat-graphite);
  stroke-width: .8;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 2000;
  animation: b-course-draw 1.6s var(--cat-ease-unfurl) both,
             b-course-breathe 12s var(--cat-ease-settle) 2s infinite alternate;
  opacity: 0.35;
}
[data-design="b"] .b-course--0 { animation-delay: 0.2s, 2.2s; }
[data-design="b"] .b-course--1 { animation-delay: 0.4s, 2.4s; }
[data-design="b"] .b-course--2 { animation-delay: 0.6s, 2.6s; }
[data-design="b"] .b-course--3 { animation-delay: 0.8s, 2.8s; }
[data-design="b"] .b-course--4 { animation-delay: 1.0s, 3.0s; }
[data-design="b"] .b-course--5 { animation-delay: 1.2s, 3.2s; }
[data-design="b"] .b-course--6 { animation-delay: 1.4s, 3.4s; }
[data-design="b"] .b-course--7 { animation-delay: 1.6s, 3.6s; }

@keyframes b-course-draw {
  from { stroke-dashoffset: 2000; }
  to   { stroke-dashoffset: 0; }
}
@keyframes b-course-breathe {
  0%   { opacity: 0.28; }
  50%  { opacity: 0.45; }
  100% { opacity: 0.32; }
}

/* Isobars */
[data-design="b"] .b-isobar {
  fill: none;
  stroke: var(--cat-cyan);
  stroke-width: .8;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 4 6;
  animation: b-isobar-drift 16s linear infinite;
  animation-delay: calc(var(--i, 0) * -3.5s);
}
@keyframes b-isobar-drift {
  0%   { stroke-dashoffset: 0;   transform: translateX(0); }
  50%  { stroke-dashoffset: -40; transform: translateX(-14px); }
  100% { stroke-dashoffset: -80; transform: translateX(0); }
}

/* Hero content */
[data-design="b"] .rf-hero__content {
  position: relative; z-index: 1;
  padding: var(--cat-s-frame) clamp(16px, 5vw, 80px);
  max-width: 860px;
  margin-inline: auto;
  width: 100%;
}

[data-design="b"] .rf-hero .rf-eyebrow {
  color: var(--cat-orange);
  margin-bottom: var(--cat-s-beam);
  opacity: 1;
}

[data-design="b"] .rf-hero__headline {
  font-family: var(--cat-font-display);
  font-size: clamp(42px, 7vw, 76px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--cat-bg);
  margin: 0 0 var(--cat-s-beam);
  opacity: 1;
}

[data-design="b"] .rf-hero__subtitle {
  font-family: var(--cat-font-body);
  font-size: clamp(16px, 2vw, 20px);
  color: var(--cat-mist);
  line-height: 1.5;
  margin: 0 0 var(--cat-s-stud);
  max-width: 56ch;
  opacity: 1;
}

[data-design="b"] .rf-hero__proof {
  font-family: var(--cat-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cat-stone);
  margin: 0 0 var(--cat-s-span);
  opacity: 1;
}

[data-design="b"] .rf-hero__cta-group {
  display: flex;
  align-items: center;
  gap: var(--cat-s-beam);
  flex-wrap: wrap;
}

[data-design="b"] .rf-hero__phone {
  font-family: var(--cat-font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cat-mist);
  text-decoration: none;
  padding: 12px 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--cat-d-quick) var(--cat-ease-register);
  opacity: 1;
}
[data-design="b"] .rf-hero__phone:hover { color: var(--cat-bg); }

/* ════════════════════════════════════════════════════════════
   E2 — CTA tensor (cable-bow button)
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-cta {
  display: inline-flex; align-items: center; gap: var(--cat-s-stud);
  padding: 14px 22px;
  background: var(--cat-orange);
  color: var(--cat-bg);
  font-family: var(--cat-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 13px; font-weight: 500;
  text-decoration: none;
  border: none; border-radius: var(--cat-r-edge);
  position: relative;
  cursor: pointer;
  transition:
    background-color var(--cat-d-quick) var(--cat-ease-register),
    transform var(--cat-d-quick) var(--cat-ease-register);
  animation: cat-cta-breath 4.5s var(--cat-ease-settle) infinite;
  will-change: transform;
  min-height: 44px;
}
[data-design="b"] .rf-cta::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--cat-ink);
  opacity: 0;
  transition: opacity var(--cat-d-quick) linear;
}
[data-design="b"] .rf-cta:hover,
[data-design="b"] .rf-cta:focus-visible {
  background: color-mix(in oklab, var(--cat-orange), black 8%);
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--cat-orange), transparent 70%);
}
[data-design="b"] .rf-cta:active { transform: translateY(1px); }
[data-design="b"] .rf-cta:active::after { opacity: 1; }

[data-design="b"] .rf-cta__cable {
  width: 44px; height: 16px; overflow: visible; flex-shrink: 0;
}
[data-design="b"] .rf-cta__cable-line,
[data-design="b"] .rf-cta__cable-head {
  fill: none; stroke: currentColor; stroke-width: 1.5;
  stroke-linecap: round; stroke-linejoin: round;
  transition: transform var(--cat-d-base) var(--cat-ease-unfurl);
}
[data-design="b"] .rf-cta:hover .rf-cta__cable-line,
[data-design="b"] .rf-cta:focus-visible .rf-cta__cable-line {
  transform: translateY(-2px);
}

@keyframes cat-cta-breath {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.012); }
}

/* ════════════════════════════════════════════════════════════
   E6 — POINTER (water-shed course-lay, between hero and funnel)
   data-mf-role="pointer"
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .b-pointer {
  display: flex;
  justify-content: center;
  padding: clamp(40px, 7vw, 72px) 16px clamp(48px, 8vw, 80px);
  background: var(--cat-bg);
  opacity: 1;
  min-height: 80px;
}

[data-design="b"] .b-pointer__hit {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: var(--cat-s-stud);
  text-decoration: none;
  color: var(--cat-graphite);
  cursor: default;
}

[data-design="b"] .b-pointer__svg {
  width: 120px;
  height: 64px;
  overflow: visible;
}

/* Course-lay lines settle in toward funnel one by one */
[data-design="b"] .b-pointer-course {
  stroke: var(--cat-graphite);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 120;
  animation: b-ptr-course-flow 5s var(--cat-ease-settle) infinite;
}
[data-design="b"] .b-pointer-course--0 { animation-delay: 0s;    opacity: 0.6; }
[data-design="b"] .b-pointer-course--1 { animation-delay: 0.4s;  opacity: 0.5; }
[data-design="b"] .b-pointer-course--2 { animation-delay: 0.8s;  opacity: 0.4; }
[data-design="b"] .b-pointer-course--3 { animation-delay: 1.2s;  opacity: 0.3; }

@keyframes b-ptr-course-flow {
  0%   { stroke-dashoffset: 120; opacity: 0.1; }
  30%  { stroke-dashoffset: 0;   opacity: inherit; }
  70%  { stroke-dashoffset: 0;   opacity: inherit; }
  100% { stroke-dashoffset: -60; opacity: 0.05; }
}

[data-design="b"] .b-pointer__label {
  font-family: var(--cat-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cat-stone);
  animation: b-ptr-label 5s ease-in-out infinite;
}
@keyframes b-ptr-label {
  0%, 20%, 100% { opacity: 0.2; }
  50%, 75%       { opacity: 0.75; }
}

/* ════════════════════════════════════════════════════════════
   E5 — FUNNEL (5-step load-case intake)
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-interactive {
  background: var(--cat-bg);
  padding-block: var(--cat-s-frame);
  border-top: 1px solid var(--cat-hairline);
}

[data-design="b"] .rf-funnel__head,
[data-design="b"] .rf-funnel,
[data-design="b"] .rf-funnel__beam,
[data-design="b"] .rf-funnel__trust {
  max-width: 880px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
}

[data-design="b"] .rf-funnel__sub {
  font-family: var(--cat-font-body);
  font-size: 18px;
  color: var(--cat-graphite);
  margin: 0 0 var(--cat-s-span);
  max-width: 56ch;
  line-height: 1.6;
}

/* Beam progress bar */
[data-design="b"] .rf-funnel__beam {
  position: relative;
  height: 8px;
  background: var(--cat-mist);
  margin-bottom: var(--cat-s-span);
  border-radius: var(--cat-r-edge);
}
[data-design="b"] .rf-beam__fill {
  position: absolute; inset: 0 auto 0 0;
  width: 0%;
  background: var(--cat-orange);
  transition: width var(--cat-d-settle) var(--cat-ease-settle);
  border-radius: var(--cat-r-edge);
}
[data-design="b"] .rf-beam__ticks {
  position: absolute; inset: 16px 0 auto 0;
  display: grid; grid-template-columns: repeat(5, 1fr);
  list-style: none; margin: 0; padding: 0;
  font-family: var(--cat-font-mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--cat-stone);
}
[data-design="b"] .rf-beam__ticks li {
  padding-top: 8px; padding-left: 4px;
  border-top: 1px solid var(--cat-hairline);
}
[data-design="b"] .rf-beam__ticks li span {
  color: var(--cat-orange); margin-right: 4px;
}

/* Steps */
[data-design="b"] .rf-funnel {
  position: relative;
  border: 1px solid var(--cat-hairline);
  background: var(--cat-surface);
  border-radius: var(--cat-r-edge);
  padding: var(--cat-s-span);
  min-height: 360px;
  overflow: hidden;
}
[data-design="b"] .rf-step {
  border: 0; padding: 0; margin: 0;
  display: none;
  animation: cat-step-unfurl var(--cat-d-settle) var(--cat-ease-unfurl) both;
}
[data-design="b"] .rf-step.is-active { display: block; }
[data-design="b"] .rf-step.is-leaving {
  display: block;
  animation: cat-step-settle var(--cat-d-settle) var(--cat-ease-settle) both;
}

@keyframes cat-step-unfurl {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes cat-step-settle {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(18px); }
}

[data-design="b"] .rf-step__label {
  font-family: var(--cat-font-mono); font-size: 12px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--cat-orange); padding: 0; display: block;
  margin-bottom: var(--cat-s-stud);
}
[data-design="b"] .rf-step__q {
  font-family: var(--cat-font-display);
  font-size: clamp(20px, 3vw, 26px);
  color: var(--cat-ink);
  margin: 0 0 var(--cat-s-beam);
  font-weight: 500; letter-spacing: -0.01em; line-height: 1.2;
}
[data-design="b"] .rf-step__note {
  font-family: var(--cat-font-body);
  font-size: 14px;
  color: var(--cat-stone);
  margin: var(--cat-s-stud) 0;
  min-height: 1.4em;
}

/* Options (radio chips) */
[data-design="b"] .rf-options {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--cat-s-stud); margin-bottom: var(--cat-s-beam);
}
[data-design="b"] .rf-options--col { grid-template-columns: 1fr; }
[data-design="b"] .rf-options label {
  display: flex; align-items: center; gap: var(--cat-s-stud);
  padding: var(--cat-s-stud) var(--cat-s-joist);
  border: 1px solid var(--cat-hairline); border-radius: var(--cat-r-edge);
  font-size: 15px; cursor: pointer; color: var(--cat-ink);
  min-height: 44px;
  transition:
    border-color var(--cat-d-quick) var(--cat-ease-register),
    background-color var(--cat-d-quick) linear;
}
[data-design="b"] .rf-options label:hover { border-color: var(--cat-orange); }
[data-design="b"] .rf-options input[type="radio"] { accent-color: var(--cat-orange); }
[data-design="b"] .rf-options label:has(input:checked) {
  border-color: var(--cat-orange);
  background: color-mix(in oklab, var(--cat-orange), transparent 92%);
}

/* Members (text inputs) */
[data-design="b"] .rf-members {
  display: grid; gap: var(--cat-s-joist); margin-bottom: var(--cat-s-beam);
}
[data-design="b"] .rf-member {
  display: flex; flex-direction: column; gap: 6px;
}
[data-design="b"] .rf-member--full { grid-column: 1 / -1; }
[data-design="b"] .rf-member span {
  font-family: var(--cat-font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; font-size: 11px; color: var(--cat-stone);
}
[data-design="b"] .rf-member input,
[data-design="b"] .rf-member textarea {
  padding: 12px 14px; background: transparent; color: var(--cat-ink);
  font-family: var(--cat-font-body); font-size: 16px;
  border: 1px solid var(--cat-hairline); border-radius: var(--cat-r-edge);
  outline: none; resize: vertical;
  transition:
    border-color var(--cat-d-quick) var(--cat-ease-register),
    box-shadow var(--cat-d-quick) linear;
}
[data-design="b"] .rf-member input:focus-visible,
[data-design="b"] .rf-member textarea:focus-visible {
  border-color: var(--cat-orange);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--cat-orange), transparent 70%);
}

/* Step nav + tensors */
[data-design="b"] .rf-step__nav {
  display: flex; justify-content: space-between; gap: var(--cat-s-stud);
  margin-top: var(--cat-s-beam);
}
[data-design="b"] .rf-step__nav:has(.rf-tensor:only-child) { justify-content: flex-end; }

[data-design="b"] .rf-tensor {
  font-family: var(--cat-font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; font-size: 12px;
  padding: 12px 18px; border-radius: var(--cat-r-edge);
  cursor: pointer; border: 1px solid var(--cat-hairline);
  background: transparent; color: var(--cat-ink);
  min-height: 44px; min-width: 44px;
  transition: all var(--cat-d-quick) var(--cat-ease-register);
}
[data-design="b"] .rf-tensor--primary {
  background: var(--cat-orange);
  color: var(--cat-bg);
  border-color: var(--cat-orange);
}
[data-design="b"] .rf-tensor--primary:hover {
  background: color-mix(in oklab, var(--cat-orange), black 8%);
}
[data-design="b"] .rf-tensor--secondary:hover {
  border-color: var(--cat-orange);
  color: var(--cat-orange);
}
[data-design="b"] .rf-tensor:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--cat-orange), transparent 70%);
}
[data-design="b"] .rf-tensor:active { transform: translateY(1px); }

/* Confirmation summary */
[data-design="b"] .rf-summary {
  margin: var(--cat-s-beam) 0 0;
  display: grid; grid-template-columns: max-content 1fr;
  gap: var(--cat-s-stud) var(--cat-s-beam);
  border-top: 1px solid var(--cat-hairline);
  padding-top: var(--cat-s-beam);
}
[data-design="b"] .rf-summary dt {
  font-family: var(--cat-font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; font-size: 11px; color: var(--cat-stone);
}
[data-design="b"] .rf-summary dd {
  font-family: var(--cat-font-mono); font-size: 14px;
  color: var(--cat-ink); margin: 0;
}

/* Trust block below funnel */
[data-design="b"] .rf-funnel__trust {
  margin-top: var(--cat-s-span);
  border-top: 1px solid var(--cat-mist);
  padding-top: var(--cat-s-beam);
}
[data-design="b"] .rf-trust-line {
  font-family: var(--cat-font-mono);
  font-size: 12px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--cat-stone);
  margin: 0 0 var(--cat-s-stud);
}
[data-design="b"] .rf-trust-line--note {
  text-transform: none; letter-spacing: 0;
  font-family: var(--cat-font-body); font-size: 13px;
}

/* ════════════════════════════════════════════════════════════
   E3 — Services section (isobar ambient)
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-ambient-a {
  position: relative; isolation: isolate;
  padding-block: var(--cat-s-frame);
  background: var(--cat-bg);
  overflow: hidden;
}
[data-design="b"] .rf-ambient-a__motion {
  position: absolute; inset: 0; z-index: 0;
  opacity: 0.28; pointer-events: none;
}
[data-design="b"] .rf-ambient-a__motion svg { width: 100%; height: 100%; display: block; }
[data-design="b"] .rf-isobar {
  fill: none; stroke: var(--cat-cyan); stroke-width: .9;
  vector-effect: non-scaling-stroke; stroke-dasharray: 4 6;
  animation: cat-isobar-flow 16s linear infinite;
  animation-delay: calc(var(--i, 0) * -2s);
  animation-play-state: paused;
}
[data-design="b"] .rf-ambient-a.is-live .rf-isobar { animation-play-state: running; }

@keyframes cat-isobar-flow {
  0%   { stroke-dashoffset: 0;   transform: translateX(0); }
  50%  { stroke-dashoffset: -40; transform: translateX(-12px); }
  100% { stroke-dashoffset: -80; transform: translateX(0); }
}

[data-design="b"] .rf-ambient-a__content {
  position: relative; z-index: 1;
  max-width: 1200px; margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
}

/* ════════════════════════════════════════════════════════════
   E4 — Process section (soap-film membrane ambient)
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-ambient-b {
  position: relative; isolation: isolate; overflow: hidden;
  padding-block: var(--cat-s-frame);
  background: var(--cat-surface);
  border-block: 1px solid var(--cat-mist);
}
[data-design="b"] .rf-ambient-b__content {
  position: relative; z-index: 1;
  max-width: 1200px; margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
}
[data-design="b"] .rf-studio {
  display: grid; grid-template-columns: 1.6fr 1fr;
  gap: var(--cat-s-span); align-items: start;
}
[data-design="b"] .rf-studio__copy {
  font-family: var(--cat-font-body); font-size: 18px;
  line-height: 1.6; color: var(--cat-graphite); max-width: 60ch;
}
[data-design="b"] .rf-data-list {
  display: flex; flex-direction: column;
  border-top: 1px solid var(--cat-hairline); margin: 0;
}
[data-design="b"] .rf-data-list > div {
  display: grid; grid-template-columns: 1fr auto;
  padding: var(--cat-s-stud) 0;
  border-bottom: 1px solid var(--cat-mist);
}
[data-design="b"] .rf-data-list dt {
  font-family: var(--cat-font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; font-size: 11px; color: var(--cat-stone);
}
[data-design="b"] .rf-data-list dd {
  font-family: var(--cat-font-mono); font-size: 14px;
  color: var(--cat-ink); margin: 0; font-variant-numeric: tabular-nums;
}

[data-design="b"] .rf-ambient-b__motion {
  position: absolute; inset: 0; z-index: 0;
  opacity: 0.18; pointer-events: none;
}
[data-design="b"] .rf-ambient-b__motion svg { width: 100%; height: 100%; display: block; }
[data-design="b"] .rf-mb {
  fill: none; stroke: var(--cat-ink);
  stroke-width: .75; vector-effect: non-scaling-stroke;
}
[data-design="b"] .rf-mb__node { fill: var(--cat-ink); }
[data-design="b"] .rf-mb__node--accent { fill: var(--cat-orange); }

[data-design="b"] .rf-ambient-b.is-live .rf-membrane {
  animation: cat-membrane-breathe 20s var(--cat-ease-settle) infinite alternate;
  transform-origin: center;
}
@keyframes cat-membrane-breathe {
  0%   { transform: translateY(0) scale(1); }
  33%  { transform: translateY(-6px) scale(1.008); }
  66%  { transform: translateY(3px) scale(0.996); }
  100% { transform: translateY(-2px) scale(1.004); }
}

/* ════════════════════════════════════════════════════════════
   Shared typography + layout components
   ════════════════════════════════════════════════════════════ */
[data-design="b"] .rf-eyebrow {
  font-family: var(--cat-font-mono); font-size: 12px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--cat-orange); margin: 0 0 var(--cat-s-stud);
}
[data-design="b"] .rf-section-h {
  font-family: var(--cat-font-display);
  font-size: clamp(32px, 5.5vw, 52px);
  font-weight: 500; letter-spacing: -0.02em; line-height: 1.08;
  color: var(--cat-ink); margin: 0 0 var(--cat-s-span); max-width: 22ch;
}

/* Methods (numbered service rows) */
[data-design="b"] .rf-methods { display: flex; flex-direction: column; }
[data-design="b"] .rf-method {
  display: grid; grid-template-columns: 80px 1fr; gap: var(--cat-s-beam);
  padding: var(--cat-s-beam) 0; border-top: 1px solid var(--cat-hairline);
  transition: border-color var(--cat-d-base) var(--cat-ease-register);
}
[data-design="b"] .rf-method:last-child { border-bottom: 1px solid var(--cat-hairline); }
[data-design="b"] .rf-method:hover { border-top-color: var(--cat-orange); }
[data-design="b"] .rf-method__num {
  font-family: var(--cat-font-mono); color: var(--cat-orange);
  font-size: 26px; letter-spacing: 0.04em;
}
[data-design="b"] .rf-method h3 {
  font-family: var(--cat-font-display); font-size: 24px; font-weight: 500;
  margin: 0 0 var(--cat-s-stud); color: var(--cat-ink); letter-spacing: -0.01em;
}
[data-design="b"] .rf-method p {
  margin: 0; color: var(--cat-graphite); max-width: 60ch; line-height: 1.5; font-size: 16px;
}

/* Portfolio / before-after */
[data-design="b"] .rf-portfolio {
  background: var(--cat-surface);
  border-block: 1px solid var(--cat-mist);
  padding-block: var(--cat-s-frame);
}
[data-design="b"] .rf-portfolio__inner {
  max-width: 1200px; margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
}
[data-design="b"] .rf-portfolio__note {
  font-size: 16px; color: var(--cat-graphite);
  margin: 0 0 var(--cat-s-span); max-width: 60ch; line-height: 1.6;
}
[data-design="b"] .rf-ba-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--cat-s-beam); margin-bottom: var(--cat-s-frame);
}
[data-design="b"] .rf-ba-card {
  border: 1px solid var(--cat-hairline); border-radius: var(--cat-r-edge);
  background: var(--cat-bg); overflow: hidden;
}
[data-design="b"] .rf-ba-card__vis {
  width: 100%; aspect-ratio: 400/220;
  background: var(--cat-ink);
}
[data-design="b"] .rf-ba-schematic { width: 100%; height: 100%; display: block; }
[data-design="b"] .rf-ba-card__text {
  padding: var(--cat-s-beam);
}
[data-design="b"] .rf-ba-card__sys {
  font-family: var(--cat-font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--cat-orange); margin: 0 0 var(--cat-s-stud);
}
[data-design="b"] .rf-ba-card__desc {
  font-size: 14px; color: var(--cat-graphite); line-height: 1.55; margin: 0;
}
[data-design="b"] .rf-portfolio__cta {
  display: flex; justify-content: center; margin-top: var(--cat-s-span);
}

/* About */
[data-design="b"] .rf-about {
  background: var(--cat-bg);
  padding-block: var(--cat-s-frame);
  border-top: 1px solid var(--cat-mist);
}
[data-design="b"] .rf-about__inner {
  max-width: 1200px; margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
}
[data-design="b"] .rf-about__body p {
  font-size: 17px; color: var(--cat-graphite);
  line-height: 1.65; max-width: 64ch;
  margin: 0 0 1em;
}
[data-design="b"] .rf-about__body a { color: var(--cat-orange); }

/* Footer */
[data-design="b"] .rf-footer {
  background: var(--cat-ink); color: var(--cat-mist);
  padding-top: 0; padding-bottom: var(--cat-s-frame);
  border-top: 1px solid var(--cat-graphite);
}
[data-design="b"] .rf-footer__beam {
  height: 3px; background: var(--cat-graphite); margin-bottom: var(--cat-s-frame);
  position: relative;
}
[data-design="b"] .rf-footer__beam::after {
  content: ""; position: absolute; left: 0; top: 0;
  width: clamp(80px, 15%, 192px); height: 100%;
  background: var(--cat-orange);
}
[data-design="b"] .rf-footer__inner {
  max-width: 1440px; margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: var(--cat-s-span); align-items: start;
}
[data-design="b"] .rf-footer__firm {
  font-family: var(--cat-font-display); font-size: 18px; font-weight: 600;
  color: var(--cat-bg); margin: 0 0 var(--cat-s-stud);
}
[data-design="b"] .rf-footer__sub {
  font-family: var(--cat-font-mono); font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--cat-stone); margin: 0 0 var(--cat-s-bolt);
}
[data-design="b"] .rf-footer__contact {
  font-family: var(--cat-font-mono); font-size: 14px;
  color: var(--cat-mist); margin: 0 0 var(--cat-s-stud); line-height: 1.5;
}
[data-design="b"] .rf-footer__contact a { color: var(--cat-orange); text-decoration: none; }
[data-design="b"] .rf-footer__col--stamp {
  display: flex; flex-direction: column; gap: var(--cat-s-beam);
  align-items: flex-end;
}
[data-design="b"] .rf-footer__copy {
  font-family: var(--cat-font-mono); font-size: 11px; letter-spacing: 0.08em;
  color: var(--cat-stone); margin: 0; text-align: right;
}

/* ════════════════════════════════════════════════════════════
   BREAKPOINTS
   ════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  [data-design="b"] .rf-studio { grid-template-columns: 1fr; gap: var(--cat-s-beam); }
  [data-design="b"] .rf-method { grid-template-columns: 1fr; gap: var(--cat-s-stud); }
  [data-design="b"] .rf-method__num { font-size: 20px; }
  [data-design="b"] .rf-ba-grid { grid-template-columns: 1fr; }
  [data-design="b"] .rf-footer__inner { grid-template-columns: 1fr; }
  [data-design="b"] .rf-footer__col--stamp { align-items: flex-start; }
  [data-design="b"] .rf-footer__copy { text-align: left; }
}

@media (max-width: 560px) {
  [data-design="b"] .rf-options { grid-template-columns: 1fr; }
  [data-design="b"] .rf-funnel { padding: var(--cat-s-beam); min-height: 320px; }
  [data-design="b"] .rf-beam__ticks { font-size: 9px; }
  [data-design="b"] .rf-hero__cta-group { flex-direction: column; align-items: flex-start; }
  [data-design="b"] .rf-drawer { inset: 56px 0 0 0; }
}

/* ════════════════════════════════════════════════════════════
   REDUCED MOTION
   ════════════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  [data-design="b"] .rf-chain__curve { animation: none; }
  [data-design="b"] .rf-burger span { transition: none; }
  [data-design="b"] .rf-cta { animation: none; }
  [data-design="b"] .rf-cta__cable-line,
  [data-design="b"] .rf-cta__cable-head { transition: none; }
  [data-design="b"] .rf-isobar { animation: none; transform: none; }
  [data-design="b"] .rf-ambient-b.is-live .rf-membrane { animation: none; }
  [data-design="b"] .rf-step,
  [data-design="b"] .rf-step.is-leaving { animation: none; }
  [data-design="b"] .rf-beam__fill { transition: none; }

  /* Hero backdrop reduced motion */
  [data-design="b"] .b-ridge-left,
  [data-design="b"] .b-ridge-right { animation: none; stroke-dashoffset: 0; opacity: 0.6; }
  [data-design="b"] .b-ridge-crown { animation: none; }
  [data-design="b"] .b-roof-plane { animation: none; }
  [data-design="b"] .b-course { animation: none; stroke-dashoffset: 0; opacity: 0.35; }
  [data-design="b"] .b-isobar { animation: none; }
  [data-design="b"] .b-pointer-course { animation: none; opacity: 0.5; stroke-dashoffset: 0; }
  [data-design="b"] .b-pointer__label { animation: none; opacity: 0.7; }
}

/* ════════════════════════════════════════════════════════════
   OVERFLOW GUARDS (required — mandatory footer)
   ════════════════════════════════════════════════════════════ */
[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; }