/* ═══════════════════════════════════════════════════════════════════
   Design B — Exposed Systems × Royal Rooter & Plumbing
   All selectors scoped [data-design="b"]
   ~12–16 trade-rooted color tokens
   ═══════════════════════════════════════════════════════════════════ */

/* ── Token block ── */
[data-design="b"] {
  --ink:             #0E1115;
  --ink-2:           #2A2F37;
  --paper:           #F2EFE8;
  --paper-2:         #E8E3D8;
  --rule:            #C9C2B4;
  --guide:           #4A6FA5;
  --muted:           #6B6F76;
  --sys-structural:  #D62828;   /* Pompidou red — primary accent */
  --sys-mechanical:  #1D6FB8;   /* Pompidou blue — water supply */
  --sys-electrical:  #2A9D45;   /* Pompidou green — success */
  --sys-ventilation: #F4B400;   /* Pompidou yellow */
  --copper:          #B87333;   /* plumber-specific hero copper */
  --critical:        #9E1212;
  --success:         var(--sys-electrical);
  /* design-b required exposure token */
  --design-b-primary: var(--sys-structural);

  --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(44px, 6.5vw, 88px);

  --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);

  /* base resets */
  box-sizing: border-box;
  font-family: var(--font-body);
  font-size: var(--t-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

[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;
  color: var(--copper);
}

[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;
  transition: background var(--dur-fast) var(--ease-snap);
  min-width: 44px;
  min-height: 44px;
  justify-content: center;
}

[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 pipe-detail behind header bar */
[data-design="b"] .rf-header__atmos {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.2;
}

[data-design="b"] .rf-header__atmos line,
[data-design="b"] .rf-header__atmos circle {
  fill: var(--copper);
  stroke: var(--copper);
  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(--copper);
  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__phone {
  display: inline-flex;
  align-items: center;
  padding: 14px 20px;
  background: var(--sys-structural);
  color: var(--paper);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.05em;
  font-weight: 600;
  min-height: 44px;
  transition: background var(--dur-fast) var(--ease-snap);
}

[data-design="b"] .rf-drawer__phone:hover {
  background: var(--critical);
}

[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);
}

/* ── HERO ── */
[data-design="b"] .rf-hero {
  position: relative;
  min-height: clamp(480px, 72vh, 760px);
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #1A0F06;
}

[data-design="b"] .rf-hero__backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

[data-design="b"] .rf-hero__svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Hero pipe schematic — draws in, then sustains ambient flow (v0.2.1 perceptible ambient) */
[data-design="b"] .b-pipe {
  stroke: var(--copper);
  stroke-width: 2;
  stroke-linecap: square;
  fill: none;
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: b-pipe-draw var(--dur-draw) var(--ease-draft) 0.2s forwards;
}

[data-design="b"] .b-pipe--riser {
  stroke-dasharray: 700;
  stroke-dashoffset: 700;
  animation: b-pipe-draw 1600ms var(--ease-draft) 0.4s forwards;
}

[data-design="b"] .b-pipe--branch {
  stroke-dasharray: 500;
  stroke-dashoffset: 500;
  animation: b-pipe-draw 1200ms var(--ease-draft) 0.6s forwards;
}

[data-design="b"] .b-pipe--delay1 { animation-delay: 0.5s; }
[data-design="b"] .b-pipe--delay2 { animation-delay: 0.7s; }
[data-design="b"] .b-pipe--delay3 {
  animation: b-pipe-draw 1200ms var(--ease-draft) 0.9s forwards;
}

@keyframes b-pipe-draw {
  0%   { stroke-dashoffset: 600; opacity: 0.2; }
  30%  { opacity: 0.7; }
  100% { stroke-dashoffset: 0; opacity: 0.5; }
}

[data-design="b"] .b-coupling {
  fill: none;
  stroke: var(--copper);
  stroke-width: 1.5;
  opacity: 0;
  animation: b-coupling-appear 400ms var(--ease-snap) 1.2s forwards;
}

[data-design="b"] .b-coupling--delay1 {
  animation-delay: 1.5s;
}

@keyframes b-coupling-appear {
  to { opacity: 0.6; }
}

[data-design="b"] .b-gauge {
  fill: none;
  stroke: var(--copper);
  stroke-width: 1.5;
  opacity: 0;
  animation: b-gauge-in 500ms var(--ease-snap) 1.4s forwards,
             b-gauge-breath 6s ease-in-out 2s infinite;
}

[data-design="b"] .b-gauge-needle {
  stroke: var(--sys-structural);
  stroke-width: 2;
  stroke-linecap: round;
  transform-origin: 1320px 220px;
  opacity: 0;
  animation: b-gauge-in 500ms var(--ease-snap) 1.4s forwards,
             b-needle-sweep 6s ease-in-out 2s infinite;
}

@keyframes b-gauge-in {
  0%   { opacity: 0; transform: scale(0.8); }
  100% { opacity: 0.65; transform: scale(1); }
}

/* sustained ambient: gauge breathes — perceptible ongoing motion */
@keyframes b-gauge-breath {
  0%, 100% { opacity: 0.35; }
  50%      { opacity: 0.75; }
}

@keyframes b-needle-sweep {
  0%, 100% { transform: rotate(-25deg); opacity: 0.5; }
  50%      { transform: rotate(15deg);  opacity: 0.9; }
}

[data-design="b"] .b-dim-line {
  stroke: var(--muted);
  stroke-width: 0.75;
  opacity: 0;
  animation: b-coupling-appear 600ms var(--ease-snap) 1.6s forwards;
}

[data-design="b"] .b-dim-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: b-coupling-appear 600ms var(--ease-snap) 1.8s forwards;
}

/* flow dots — sustained ambient motion (coprime cycles: 8s, 11s, 14s) */
[data-design="b"] .b-flow {
  fill: var(--copper);
  opacity: 0;
  animation: b-flow-appear 600ms var(--ease-snap) 2s forwards;
}

[data-design="b"] .b-flow--1 { animation-delay: 2s; opacity: 0; }
[data-design="b"] .b-flow--2 { animation-delay: 2.3s; opacity: 0; }
[data-design="b"] .b-flow--3 { animation-delay: 2.6s; opacity: 0; }

@keyframes b-flow-appear {
  to { opacity: 0.8; }
}

/* HERO CONTENT */
[data-design="b"] .rf-hero__content {
  position: relative;
  z-index: 2;
  padding: clamp(56px, 8vh, 120px) clamp(20px, 6vw, 80px);
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

[data-design="b"] .rf-hero__meta {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  opacity: 0.85;
  margin: 0;
  /* opacity:1 at first paint — never gated */
  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: 1.08;
  color: var(--paper);
  margin: 0;
  /* opacity:1 at first paint */
  opacity: 1;
}

[data-design="b"] .rf-hero__sub {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.5;
  color: rgba(242,239,232,0.82);
  margin: 0;
  max-width: 56ch;
  /* opacity:1 at first paint */
  opacity: 1;
}

[data-design="b"] .rf-hero__proof {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(242,239,232,0.55);
  margin: 0;
  /* opacity:1 at first paint */
  opacity: 1;
}

/* ── E2: PHONE CTA (hero) ── */
[data-design="b"] .rf-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--sys-structural);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.4vw, 15px);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--r-1);
  transition: transform var(--dur-fast) var(--ease-snap),
              background var(--dur-fast) var(--ease-snap);
  overflow: hidden;
  min-height: 52px;
  align-self: flex-start;
}

[data-design="b"] .rf-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--r-1);
  pointer-events: none;
}

[data-design="b"] .rf-cta:hover {
  background: var(--critical);
  transform: translateY(-1px);
}

[data-design="b"] .rf-cta:active {
  transform: scale(0.985);
}

[data-design="b"] .rf-cta:focus-visible {
  outline: 2px solid var(--sys-ventilation);
  outline-offset: 3px;
}

[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: 8px;
  height: 1px;
  background: rgba(255,255,255,0.4);
  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; }

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

/* mid-page and area CTAs (same class, slightly adjusted) */
[data-design="b"] .b-mid-cta,
[data-design="b"] .b-area-cta {
  background: var(--ink);
  margin-top: 24px;
}

[data-design="b"] .b-mid-cta:hover,
[data-design="b"] .b-area-cta:hover {
  background: var(--sys-structural);
}

/* ── E6: POINTER ── */
[data-design="b"] .b-pointer {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px clamp(16px, 4vw, 40px);
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  /* Visibly rendered: opacity:1, no height:0, no display:none */
  opacity: 1;
  min-height: 120px;
}

[data-design="b"] .b-pointer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

[data-design="b"] .b-pointer__svg {
  width: clamp(200px, 30vw, 320px);
  height: auto;
  overflow: visible;
}

/* pipe drawing in pointer */
[data-design="b"] .b-ptr-pipe {
  stroke: var(--copper);
  stroke-width: 2;
  stroke-linecap: square;
  fill: none;
  stroke-dasharray: 120;
  stroke-dashoffset: 120;
  animation: b-ptr-draw 1000ms var(--ease-draft) 0.3s forwards;
}

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

/* drip dots — cascading downward (hydraulic-warm register) */
[data-design="b"] .b-drip {
  fill: var(--sys-mechanical);
  opacity: 0;
}

[data-design="b"] .b-drip--1 {
  animation: b-drip-fall 2.8s ease-in-out 1.2s infinite;
}

[data-design="b"] .b-drip--2 {
  animation: b-drip-fall 2.8s ease-in-out 1.7s infinite;
}

[data-design="b"] .b-drip--3 {
  animation: b-drip-fall 2.8s ease-in-out 2.2s infinite;
}

@keyframes b-drip-fall {
  0%       { opacity: 0; transform: translateY(0); }
  15%      { opacity: 1; }
  60%      { opacity: 1; transform: translateY(8px); }
  80%      { opacity: 0; transform: translateY(16px); }
  100%     { opacity: 0; transform: translateY(0); }
}

[data-design="b"] .b-ptr-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  fill: var(--muted);
}

/* ── E5: 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-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-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 16px;
  color: var(--ink);
}

[data-design="b"] .rf-funnel__sub {
  font-size: var(--t-body);
  line-height: 1.6;
  color: var(--ink-2);
  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(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: 6px;
  align-items: baseline;
  padding: 14px 10px;
  color: var(--muted);
  border-right: 1px solid var(--rule);
  font-size: 11px;
}

[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: 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-funnel__choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

[data-design="b"] .rf-funnel__choices--contact {
  grid-template-columns: repeat(3, 1fr);
}

[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-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: 96px;
}

[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); }

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

[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(18px, 3vw, 26px);
  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);
}

@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); }
}

/* emergency note in step 2 */
[data-design="b"] .b-emergency-note {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid var(--sys-structural);
  background: rgba(214,40,40,0.06);
}

[data-design="b"] .b-emergency-note[hidden] {
  display: none;
}

[data-design="b"] .b-emergency-note__text {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 0;
}

[data-design="b"] .b-emergency-note__link {
  color: var(--sys-structural);
  font-weight: 600;
}

/* ── E3/E4: AMBIENT SECTIONS ── */
[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-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-a__copy .rf-body {
  font-size: var(--t-body);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 48ch;
  margin-bottom: 24px;
}

[data-design="b"] .b-services-list {
  list-style: none;
  padding: 0;
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--rule);
}

[data-design="b"] .b-services-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  font-size: var(--t-body);
  line-height: 1.4;
}

[data-design="b"] .b-svc-no {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.1em;
  color: var(--guide);
  min-width: 28px;
}

[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; } }

/* service area */
[data-design="b"] .b-service-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  padding: var(--gap-section) clamp(16px, 4vw, 40px);
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
  align-items: start;
}

[data-design="b"] .b-service-area__inner .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 16px;
  color: var(--ink);
}

[data-design="b"] .b-service-area__inner .rf-body {
  font-size: var(--t-body);
  line-height: 1.6;
  color: var(--ink-2);
  margin-bottom: 20px;
}

[data-design="b"] .b-area-list {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

[data-design="b"] .b-area-list li::before {
  content: "→ ";
  color: var(--sys-mechanical);
}

/* E4 ambient-b (exploded pipe assembly) */
[data-design="b"] .b-assembly {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 16px;
  overflow: hidden;
}

[data-design="b"] .b-assembly 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: 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"] .b-assembly.is-active .rf-layer {
  animation: b-ambb-lift 20s var(--ease-snap) infinite;
}

[data-design="b"] .b-assembly.is-active .rf-layer--1 { animation-delay: 0s; }
[data-design="b"] .b-assembly.is-active .rf-layer--2 { animation-delay: 1s; }
[data-design="b"] .b-assembly.is-active .rf-layer--3 { animation-delay: 2s; }
[data-design="b"] .b-assembly.is-active .rf-layer--4 { animation-delay: 3s; }
[data-design="b"] .b-assembly.is-active .rf-layer--5 { animation-delay: 4s; }
[data-design="b"] .b-assembly.is-active .rf-layer .rf-lead { stroke-dashoffset: 0; }
[data-design="b"] .b-assembly.is-active .rf-layer .rf-lead-label { opacity: 1; }

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

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

[data-design="b"] .b-about__sheet {
  border: 1px solid var(--ink);
  padding: clamp(24px, 3vw, 48px);
  max-width: 1100px;
}

[data-design="b"] .b-about__title-block {
  border-bottom: 1px solid var(--ink);
  padding-bottom: 20px;
  margin-bottom: 32px;
}

[data-design="b"] .b-about__title-block .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 8px 0 0;
  color: var(--ink);
}

[data-design="b"] .b-about__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

[data-design="b"] .b-about__col-label {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

[data-design="b"] .b-about__col p:not(.b-about__col-label) {
  font-size: var(--t-body);
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
}

/* ── FOOTER ── */
[data-design="b"] .b-footer {
  background: var(--paper-2);
  border-top: 2px solid var(--ink);
  padding: 48px clamp(16px, 4vw, 40px) 24px;
}

[data-design="b"] .b-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--rule);
}

[data-design="b"] .b-footer__col-label {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}

[data-design="b"] .b-footer__phone {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--sys-structural);
  text-decoration: none;
  margin-bottom: 8px;
}

[data-design="b"] .b-footer__phone:hover {
  color: var(--critical);
}

[data-design="b"] .b-footer__col p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0 0 4px;
}

[data-design="b"] .b-footer__base {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ══════════════════════════════════════════════════════════════
   E6 POINTER (as forward-progress bar in funnel masthead)
   For premium-funnel-compatible designs the pointer also renders
   as a forward-progress tracker inside the funnel.
══════════════════════════════════════════════════════════════ */
[data-design="b"] .exsys-pointer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  color: var(--ink);
}

[data-design="b"] .exsys-pointer__counter {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.75;
}

[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;
}

@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; }
}

/* ══════════════════════════════════════════════════════════════
   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"] .b-service-area {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: var(--gap-section-m) clamp(16px, 4vw, 32px);
  }
  [data-design="b"] .b-about__cols {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  [data-design="b"] .b-footer__cols {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 760px) {
  [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__choices--contact {
    grid-template-columns: 1fr 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"] .b-about__cols {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 560px) {
  [data-design="b"] .rf-header__atmos { opacity: 0.12; }
  [data-design="b"] .rf-logo__name { font-size: 15px; }
  [data-design="b"] .rf-hero__h1 { font-size: clamp(32px, 9vw, 52px); }
  [data-design="b"] .rf-interactive { padding: var(--gap-section-s) 16px; }
  [data-design="b"] .rf-ambient-a { padding: var(--gap-section-s) 16px; }
  [data-design="b"] .b-service-area { padding: var(--gap-section-s) 16px; }
  [data-design="b"] .b-about { padding: var(--gap-section-s) 16px; }
  [data-design="b"] .b-footer { padding: 40px 16px 20px; }
  [data-design="b"] .b-footer__cols { grid-template-columns: 1fr; }
  [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__index li:nth-child(3) { border-right: 1px solid var(--rule); }
  [data-design="b"] .b-area-list { grid-template-columns: 1fr; }
  [data-design="b"] .b-footer__base { flex-direction: column; gap: 8px; align-items: flex-start; }
}

@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-pipe,
  [data-design="b"] .b-pipe--riser,
  [data-design="b"] .b-pipe--branch {
    animation: none;
    stroke-dashoffset: 0;
    opacity: 0.5;
  }
  [data-design="b"] .b-coupling,
  [data-design="b"] .b-dim-line,
  [data-design="b"] .b-dim-label { animation: none; opacity: 0.6; }
  [data-design="b"] .b-gauge { animation: none; opacity: 0.5; }
  [data-design="b"] .b-gauge-needle { animation: none; opacity: 0.5; transform: rotate(0deg); }
  [data-design="b"] .b-flow { animation: none; opacity: 0.6; }
  [data-design="b"] .b-ptr-pipe { animation: none; stroke-dashoffset: 0; }
  [data-design="b"] .b-drip { animation: none; opacity: 0.7; }
  [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"] .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"] .b-assembly.is-active .rf-layer { animation: none; }
  [data-design="b"] .rf-layer polygon { 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; }
}

/* ══════════════════════════════════════════════════════════════
   HARD MOBILE GUARDS — appended per build 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; }