/* ================================================================
   Design B — Exposed Systems (construction-exposed-systems)
   Pihlstrom Construction · Hillsboro OR
   All selectors scoped under [data-design="b"]
   CSS custom properties exposed on [data-design="b"] block.
   ================================================================ */

/* ── Token Layer ─────────────────────────────────────────────── */
[data-design="b"] {
  /* Design B primary (structural red) exposed as requested */
  --design-b-primary: #D62828;

  /* Color tokens */
  --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);

  /* Typography */
  --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;

  /* Type scale */
  --t-meta:  11px;
  --t-cap:   13px;
  --t-body:  16px;
  --t-lead:  20px;
  --t-h3:    24px;
  --t-h2:    36px;
  --t-h1:    64px;
  --t-hero:  clamp(44px, 5.8vw, 80px);

  /* Spacing */
  --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;

  /* Motion */
  --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;

  /* Radius — this system distrusts curves */
  --r-0: 0;
  --r-1: 2px;
  --r-2: 4px;

  /* Elevation — hairline rings, no blurred drops */
  --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);

  /* Base */
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.6;
  box-sizing: border-box;
  /* Defensive overflow */
  overflow-x: hidden;
  max-width: 100vw;
}

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

[data-design="b"] img {
  max-width: 100%;
  height: auto;
  display: block;
}

[data-design="b"] svg {
  max-width: 100%;
}

/* ── Typography helpers ──────────────────────────────────────── */
[data-design="b"] .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, var(--t-h2));
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--ink);
}

[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;
  margin: 0 0 16px;
  font-variant-numeric: tabular-nums;
}

[data-design="b"] .rf-body {
  font-size: var(--t-body);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 65ch;
}

/* ── ELEMENT 1: 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;
}

[data-design="b"] .rf-burger {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 12px;
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: 0;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  justify-content: center;
  align-items: 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 backdrop 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) !important;
}

[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;
  stroke: none !important;
  stroke-dasharray: none !important;
  stroke-dashoffset: 0 !important;
}

@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: 24px;
  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: 16px;
}

[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: 22px;
  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__email {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
}

[data-design="b"] .rf-drawer__email:hover {
  color: var(--ink);
}

[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: 0;
  min-height: 44px;
}

[data-design="b"] .rf-drawer__close:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ── ELEMENT 2: CTA (funnel anchor) ─────────────────────────── */
[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: 1px solid var(--ink);
  transition: transform var(--dur-fast) var(--ease-snap), background var(--dur-fast) var(--ease-snap);
  overflow: hidden;
  min-height: 44px;
}

[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;
  flex-shrink: 0;
}

[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--sm {
  padding: 12px 18px;
  font-size: 11px;
  margin-top: 12px;
}

[data-design="b"] .rf-cta--drawer {
  margin-top: 8px;
}

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

/* ── ELEMENT 3 (backdrop): Hero ─────────────────────────────── */
[data-design="b"] .rf-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: center;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}

/* Blueprint backdrop — visible at first paint, no JS dependency */
[data-design="b"] .rf-hero__backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

[data-design="b"] .rf-hero__blueprint {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

/* Blueprint stroke elements — draw-in animation on first paint */
[data-design="b"] .bp-stroke {
  stroke: var(--ink);
  fill: none;
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
  animation: b-bp-draw 2s 0.1s var(--ease-draft) forwards;
}

[data-design="b"] .bp-col {
  stroke: var(--ink);
  stroke-dasharray: 800;
  stroke-dashoffset: 800;
  animation: b-bp-draw 1.8s 0.4s var(--ease-draft) forwards;
}

[data-design="b"] .bp-floor {
  stroke: var(--ink-2);
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
  animation: b-bp-draw 1.2s 0.8s var(--ease-draft) forwards;
}

[data-design="b"] .bp-dim {
  stroke: var(--muted);
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  animation: b-bp-draw 1s 1.2s var(--ease-draft) forwards;
}

[data-design="b"] .bp-dim--tick {
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
}

[data-design="b"] .bp-lead {
  fill: none;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: b-bp-draw 0.9s var(--ease-draft) forwards;
}

[data-design="b"] .bp-lead--s {
  stroke: var(--sys-structural);
  animation-delay: 1.4s;
}

[data-design="b"] .bp-lead--m {
  stroke: var(--sys-mechanical);
  animation-delay: 1.6s;
}

[data-design="b"] .bp-lead--e {
  stroke: var(--sys-electrical);
  animation-delay: 1.8s;
}

[data-design="b"] .bp-callout-dot {
  fill: var(--muted);
  opacity: 0;
  animation: b-bp-fade 0.4s 2s var(--ease-snap) forwards;
}

[data-design="b"] .bp-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.12em;
  opacity: 0;
  animation: b-bp-fade 0.5s 1.4s var(--ease-snap) forwards;
}

[data-design="b"] .bp-lead-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: b-bp-fade 0.5s var(--ease-snap) forwards;
}

[data-design="b"] .bp-lead-label:nth-of-type(1) { animation-delay: 1.5s; }
[data-design="b"] .bp-lead-label:nth-of-type(2) { animation-delay: 1.7s; }
[data-design="b"] .bp-lead-label:nth-of-type(3) { animation-delay: 1.9s; }

[data-design="b"] .bp-label--vert {
  transform-origin: 52px 270px;
  transform: rotate(-90deg);
}

[data-design="b"] .bp-sheet-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: b-bp-fade 0.6s 0.6s var(--ease-snap) forwards;
}

[data-design="b"] .bp-sheet-sub {
  animation-delay: 0.8s;
}

[data-design="b"] .bp-sheet-no {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: b-bp-fade 0.6s 0.7s var(--ease-snap) forwards;
}

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

@keyframes b-bp-fade {
  to { opacity: 1; }
}

/* After draw, gently breathe the backdrop — 20s cycle, ≥20% amplitude */
[data-design="b"] .rf-hero__backdrop {
  animation: b-backdrop-breath 20s 2.5s ease-in-out infinite;
}

@keyframes b-backdrop-breath {
  0%, 100% { opacity: 0.32; }
  50%       { opacity: 0.42; }
}

/* Hero text — ALL opacity:1 at default, no intersection/JS gating */
[data-design="b"] .rf-hero__content {
  position: relative;
  z-index: 1;
  padding: clamp(64px, 10vh, 120px) clamp(20px, 5vw, 60px);
  max-width: 740px;
}

[data-design="b"] .rf-hero__title-block {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

[data-design="b"] .rf-hero__meta {
  display: flex;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
  /* opacity:1 — visible by default, no animation dependency */
  opacity: 1;
  margin: 0;
}

[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: 1.08;
  color: var(--ink);
  margin: 0;
  /* opacity:1 — visible by default, no animation dependency */
  opacity: 1;
}

[data-design="b"] .rf-hero__subtitle {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
  max-width: 56ch;
  /* opacity:1 — visible by default, no animation dependency */
  opacity: 1;
}

[data-design="b"] .rf-hero__proof {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0;
  padding: 12px 0;
  border-top: 1px solid var(--rule);
  /* opacity:1 — visible by default, no animation dependency */
  opacity: 1;
}

/* ── ELEMENT 6: Pointer (BELOW hero, never inside it) ────────── */
[data-design="b"] .rf-pointer-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px 0 0;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

[data-design="b"] .rf-pointer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding-bottom: 24px;
}

[data-design="b"] .rf-pointer__svg {
  overflow: visible;
}

/* Pointer T-square elements */
[data-design="b"] .ptr-crossbar {
  stroke: var(--ink);
  stroke-width: 1.5;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: b-ptr-draw 1.2s 0.3s var(--ease-draft) forwards;
}

[data-design="b"] .ptr-crossbar--tick {
  stroke-dasharray: 16;
  stroke-dashoffset: 16;
  animation-delay: 0.8s;
}

[data-design="b"] .ptr-stem {
  stroke: var(--ink);
  stroke-width: 1.5;
  stroke-dasharray: 30;
  stroke-dashoffset: 30;
  animation: b-ptr-draw 0.6s 1s var(--ease-draft) forwards;
}

[data-design="b"] .ptr-head {
  stroke: var(--sys-structural);
  stroke-width: 1.5;
  fill: none;
  stroke-linejoin: miter;
  stroke-dasharray: 30;
  stroke-dashoffset: 30;
  animation: b-ptr-draw 0.5s 1.4s var(--ease-draft) forwards;
}

[data-design="b"] .ptr-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0;
  animation: b-bp-fade 0.5s 0.5s var(--ease-snap) forwards;
}

/* Gentle pointer breath — draws attention downward without bouncing */
[data-design="b"] .rf-pointer__svg {
  animation: b-ptr-settle 6s 2s ease-in-out infinite;
}

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

@keyframes b-ptr-settle {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(4px); }
}

/* ── ELEMENT 5: Funnel ───────────────────────────────────────── */
[data-design="b"] .rf-interactive {
  padding: var(--gap-section) clamp(16px, 4vw, 40px);
  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 {
  margin: 0 0 12px;
}

[data-design="b"] .rf-funnel__masthead .rf-h2 {
  margin: 0 0 24px;
}

[data-design="b"] .rf-funnel__index {
  list-style: none;
  padding: 16px 0 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

[data-design="b"] .rf-funnel__index li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 16px 12px;
  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: 420px;
}

[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: 11px;
  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: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 16px;
}

[data-design="b"] .rf-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;
}

[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-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-width var(--dur-fast) var(--ease-snap);
}

[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-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(--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;
}

/* Buttons */
[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;
}

/* Stamps */
[data-design="b"] .rf-stamp {
  display: inline-flex;
  padding: 6px 10px;
  border: 1.5px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  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;
}

@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); }
}

/* Funnel trust footer */
[data-design="b"] .rf-funnel__trust {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}

[data-design="b"] .rf-funnel__trust-col .rf-meta {
  margin: 0 0 8px;
}

[data-design="b"] .rf-funnel__trust-col p {
  font-size: 14px;
  color: var(--ink-2);
  margin: 0;
  line-height: 1.5;
}

[data-design="b"] .rf-funnel__trust-col a {
  color: var(--ink-2);
  text-decoration: none;
}

[data-design="b"] .rf-funnel__trust-col a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ── Gallery (firm photos, honest) ──────────────────────────── */
[data-design="b"] .rf-gallery {
  padding: var(--gap-section) clamp(16px, 4vw, 40px);
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
}

[data-design="b"] .rf-gallery__head {
  max-width: 60ch;
  margin: 0 0 48px;
}

[data-design="b"] .rf-gallery__caption-note {
  font-size: 14px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  margin: 0;
}

[data-design="b"] .rf-gallery__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2px;
}

[data-design="b"] .rf-gallery__item {
  margin: 0;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--paper);
}

[data-design="b"] .rf-gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-snap);
}

[data-design="b"] .rf-gallery__item:hover img {
  transform: scale(1.03);
}

[data-design="b"] .rf-gallery__cta-row {
  display: flex;
  justify-content: center;
  padding-top: 48px;
}

/* ── ELEMENT 4 (ambient-b): Exploded wall assembly ───────────── */
[data-design="b"] .rf-ambient-b {
  padding: var(--gap-section) clamp(16px, 4vw, 40px);
  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 {
  margin: 0 0 16px;
}

[data-design="b"] .rf-ambient-b__head .rf-h2 {
  margin: 0 0 20px;
}

[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);
  max-width: 100%;
}

[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: 60;
  stroke-dashoffset: 60;
  transition: stroke-dashoffset var(--dur-base) var(--ease-draft);
}

[data-design="b"] .rf-layer .rf-lead-label {
  font-family: var(--font-mono);
  font-size: 9px;
  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); }
}

/* Services list */
[data-design="b"] .rf-services__list {
  list-style: none;
  padding: 24px 0 0;
  margin: 24px 0 0;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: -0.01em;
}

[data-design="b"] .rf-services__list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

[data-design="b"] .rf-services__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--guide);
  flex-shrink: 0;
}

/* ── ELEMENT 4 (ambient-a): Live building section ────────────── */
[data-design="b"] .rf-ambient-a {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  padding: var(--gap-section) clamp(16px, 4vw, 40px);
  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 {
  margin: 0 0 24px;
}

[data-design="b"] .rf-ambient-a__copy .rf-h2 {
  margin: 0 0 24px;
}

[data-design="b"] .rf-ambient-a__copy .rf-body {
  max-width: 48ch;
}

[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: 11px;
  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;
  overflow: hidden;
}

[data-design="b"] .rf-ambient-a__motion svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
}

[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-run--s { stroke: var(--sys-structural); }
[data-design="b"] .rf-run--m { stroke: var(--sys-mechanical); }
[data-design="b"] .rf-run--e { stroke: var(--sys-electrical); }
[data-design="b"] .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; }
}

/* ── About ───────────────────────────────────────────────────── */
[data-design="b"] .rf-about {
  padding: var(--gap-section) clamp(16px, 4vw, 40px);
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
}

[data-design="b"] .rf-about__titleblock {
  margin: 0 0 48px;
}

[data-design="b"] .rf-about__titleblock .rf-meta {
  margin: 0 0 12px;
}

[data-design="b"] .rf-about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
}

[data-design="b"] .rf-about__col {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-2);
}

[data-design="b"] .rf-about__col .rf-field__label {
  margin-bottom: 12px;
  color: var(--ink);
}

[data-design="b"] .rf-about__dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 16px;
  font-size: 14px;
  margin: 0;
}

[data-design="b"] .rf-about__dl dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 2px;
}

[data-design="b"] .rf-about__dl dd {
  margin: 0;
  color: var(--ink-2);
}

[data-design="b"] .rf-about__dl a {
  color: var(--ink-2);
  text-decoration: none;
}

[data-design="b"] .rf-about__dl a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ── Footer ──────────────────────────────────────────────────── */
[data-design="b"] .rf-footer {
  padding: clamp(40px, 6vw, 64px) clamp(16px, 4vw, 40px) 0;
  background: var(--paper);
  border-top: 1px solid var(--ink);
}

[data-design="b"] .rf-footer__cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--rule);
}

[data-design="b"] .rf-footer__col .rf-meta {
  margin: 0 0 10px;
}

[data-design="b"] .rf-footer__col p {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.5;
  margin: 0 0 4px;
}

[data-design="b"] .rf-footer__col a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14px;
}

[data-design="b"] .rf-footer__col a:hover {
  color: var(--ink);
  text-decoration: underline;
}

[data-design="b"] .rf-footer__copy {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 20px 0;
  border-top: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 8px;
}

[data-design="b"] .rf-footer__rev {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1100px) {
  [data-design="b"] .rf-funnel__trust {
    grid-template-columns: 1fr 1fr;
  }

  [data-design="b"] .rf-footer__cols {
    grid-template-columns: 1fr 1fr;
  }

  [data-design="b"] .rf-about__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@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-gallery__grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 760px) {
  [data-design="b"] .rf-funnel__index {
    grid-template-columns: 1fr 1fr;
  }

  [data-design="b"] .rf-funnel__index li:nth-child(2) {
    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-ambient-b {
    padding: var(--gap-section-m) 16px;
  }

  [data-design="b"] .rf-ambient-b__head {
    margin-bottom: 32px;
  }

  [data-design="b"] .rf-layer .rf-lead-label {
    font-size: 8px;
  }

  [data-design="b"] .rf-about__grid {
    grid-template-columns: 1fr;
  }

  [data-design="b"] .rf-funnel__trust {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  [data-design="b"] .rf-footer__cols {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

@media (max-width: 560px) {
  [data-design="b"] .rf-header__atmos {
    opacity: 0.12;
  }

  [data-design="b"] .rf-logo__name {
    font-size: 16px;
  }

  [data-design="b"] .rf-ambient-a {
    padding: var(--gap-section-s) 16px;
  }

  [data-design="b"] .rf-hero {
    min-height: 85vh;
  }

  [data-design="b"] .rf-hero__content {
    padding: clamp(48px, 8vh, 80px) 20px;
  }

  [data-design="b"] .rf-funnel__trust {
    grid-template-columns: 1fr;
  }

  [data-design="b"] .rf-footer__cols {
    grid-template-columns: 1fr;
  }

  [data-design="b"] .rf-gallery__grid {
    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;
  }

  [data-design="b"] .rf-funnel__choices {
    grid-template-columns: 1fr;
  }
}

/* ── 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"] .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"] .bp-stroke,
  [data-design="b"] .bp-col,
  [data-design="b"] .bp-floor,
  [data-design="b"] .bp-dim,
  [data-design="b"] .bp-lead {
    animation: none;
    stroke-dashoffset: 0;
  }

  [data-design="b"] .bp-callout-dot,
  [data-design="b"] .bp-label,
  [data-design="b"] .bp-lead-label,
  [data-design="b"] .bp-sheet-label,
  [data-design="b"] .bp-sheet-no {
    animation: none;
    opacity: 1;
  }

  [data-design="b"] .rf-hero__backdrop {
    animation: none;
    opacity: 0.35;
  }

  [data-design="b"] .ptr-crossbar,
  [data-design="b"] .ptr-stem,
  [data-design="b"] .ptr-head {
    animation: none;
    stroke-dashoffset: 0;
  }

  [data-design="b"] .ptr-label {
    animation: none;
    opacity: 1;
  }

  [data-design="b"] .rf-pointer__svg {
    animation: 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-b__motion.is-active .rf-layer {
    animation: none;
  }

  [data-design="b"] .rf-layer polygon {
    transition: 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-gallery__item img {
    transition: none;
  }
}