/* ================================================================
   DESIGN-B · Exposed Systems · Realistic Rooter & Plumbing
   Slot-scope: [data-design="b"]
   ALL selectors begin with [data-design="b"] or @media/@keyframes/:root
   Keyframe prefix: exsysb-
   ================================================================ */

/* --- tokens ---------------------------------------------------- */
[data-design="b"] {
  --ink:              #0E1115;
  --ink-2:            #2A2F37;
  --paper:            #F2EFE8;
  --paper-2:          #E8E3D8;
  --rule:             #C9C2B4;
  --guide:            #4A6FA5;
  --muted:            #6B6F76;
  --sys-structural:   #D62828;
  --sys-mechanical:   #1D6FB8;
  --sys-electrical:   #2A9D45;
  --sys-ventilation:  #F4B400;
  --critical:         #9E1212;
  --success:          var(--sys-electrical);
  --font-display:     "Inter Tight", "Helvetica Now Display", -apple-system, system-ui, sans-serif;
  --font-body:        "Inter", -apple-system, system-ui, sans-serif;
  --font-mono:        "JetBrains Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --font-stamp:       "Times New Roman", Times, serif;
  --t-meta:           11px;
  --t-cap:            13px;
  --t-body:           16px;
  --t-lead:           20px;
  --t-h3:             24px;
  --t-h2:             36px;
  --t-h1:             64px;
  --t-hero:           clamp(40px, 5.6vw, 80px);
  --gap-hair:         1px;
  --gap-tight:        4px;
  --gap-x:            8px;
  --gap-row:          16px;
  --gap-block:        24px;
  --gap-stack:        48px;
  --gap-section:      96px;
  --gap-section-m:    64px;
  --gap-section-s:    48px;
  --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);
  --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;
  --design-b-primary: #D62828;
  box-sizing: border-box;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
}

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

/* --- base resets (scoped) -------------------------------------- */
[data-design="b"] h1,
[data-design="b"] h2,
[data-design="b"] p,
[data-design="b"] ul,
[data-design="b"] ol,
[data-design="b"] figure,
[data-design="b"] address { margin: 0; padding: 0; }

[data-design="b"] ul,
[data-design="b"] ol { list-style: none; }

/* ================================================================
   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;
  transition: background var(--dur-fast) var(--ease-snap);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  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 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: exsysb-header-draw 28s var(--ease-draft) infinite;
}
[data-design="b"] .rf-header__atmos circle { fill: var(--ink); stroke: none; }
[data-design="b"] .rf-header__dim { stroke: var(--sys-structural); }
[data-design="b"] .rf-header__dimlabel {
  fill: var(--sys-structural);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  opacity: 0;
  animation: exsysb-header-label 28s var(--ease-snap) infinite;
}

@keyframes exsysb-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 exsysb-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: 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;
  min-height: 44px;
}
[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;
  align-self: center;
}
[data-design="b"] .rf-drawer__nav .rf-nav-a:hover { color: var(--sys-structural); }
[data-design="b"] .rf-drawer__phone { display: flex; flex-direction: column; gap: 6px; }
[data-design="b"] .rf-drawer__tel {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  min-height: 44px;
  display: flex;
  align-items: center;
}
[data-design="b"] .rf-drawer__tel--alt { font-size: 16px; color: var(--muted); }
[data-design="b"] .rf-drawer__tel:hover { color: var(--sys-structural); }
[data-design="b"] .rf-drawer__cta {
  align-self: flex-start;
  text-decoration: none;
}
[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(400px, 72vh, 760px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0 clamp(16px, 5vw, 80px) clamp(48px, 7vh, 96px);
  overflow: hidden;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

/* hero backdrop: single animated layer, arrival + sustained ambient */
[data-design="b"] .rf-hero__backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
[data-design="b"] .rf-hero__pipe-svg {
  width: 100%;
  height: 100%;
  opacity: 0.14;
}
/* pipe paths draw themselves, then ambient pulses run continuously */
[data-design="b"] .b-pipe {
  fill: none;
  stroke-linecap: square;
  stroke-dasharray: 1600;
  stroke-dashoffset: 1600;
  animation: exsysb-pipe-arrive 2.2s var(--ease-draft) forwards,
             exsysb-pipe-pulse 8s ease-in-out 2.4s infinite;
}
[data-design="b"] .b-pipe--m { stroke: var(--sys-mechanical); stroke-width: 3; }
[data-design="b"] .b-pipe--s { stroke: var(--sys-structural); stroke-width: 2.5; animation-delay: 0.3s, 2.6s; }
[data-design="b"] .b-pipe--e { stroke: var(--sys-electrical); stroke-width: 2; animation-delay: 0.6s, 2.8s; }

[data-design="b"] .b-gauge {
  fill: none;
  stroke: var(--sys-structural);
  stroke-width: 1.5;
  opacity: 0;
  animation: exsysb-gauge-arrive 0.6s var(--ease-snap) 1.6s forwards,
             exsysb-gauge-breathe 6s ease-in-out 2.5s infinite;
}
[data-design="b"] .b-gauge-inner {
  fill: none;
  stroke: var(--sys-structural);
  stroke-width: 1;
  opacity: 0;
  animation: exsysb-gauge-arrive 0.5s var(--ease-snap) 1.8s forwards;
}
[data-design="b"] .b-gauge-hand {
  stroke: var(--sys-structural);
  stroke-width: 2;
  stroke-linecap: round;
  opacity: 0;
  transform-origin: 480px 260px;
  animation: exsysb-gauge-arrive 0.4s var(--ease-snap) 2s forwards,
             exsysb-hand-sweep 6s ease-in-out 2.5s infinite;
}
[data-design="b"] .b-dim {
  stroke: var(--ink);
  stroke-width: 1;
  opacity: 0;
  animation: exsysb-gauge-arrive 0.5s var(--ease-snap) 2s forwards;
}
[data-design="b"] .b-dim-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: exsysb-gauge-arrive 0.5s var(--ease-snap) 2.2s forwards;
}
[data-design="b"] .b-tick { stroke: var(--ink); stroke-width: 1; opacity: 0.4; }
[data-design="b"] .b-flow { opacity: 0; }
[data-design="b"] .b-flow--m { fill: var(--sys-mechanical); animation: exsysb-flow-arrive 0.4s ease 2.5s forwards; }
[data-design="b"] .b-flow--s { fill: var(--sys-structural); animation: exsysb-flow-arrive 0.4s ease 2.8s forwards; }
[data-design="b"] .b-flow--e { fill: var(--sys-electrical); animation: exsysb-flow-arrive 0.4s ease 3s forwards; }

@keyframes exsysb-pipe-arrive {
  to { stroke-dashoffset: 0; }
}
@keyframes exsysb-pipe-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.55; }
}
@keyframes exsysb-gauge-arrive {
  to { opacity: 1; }
}
@keyframes exsysb-gauge-breathe {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}
@keyframes exsysb-hand-sweep {
  0%, 100% { transform: rotate(0deg); }
  50%      { transform: rotate(30deg); }
}
@keyframes exsysb-flow-arrive {
  to { opacity: 1; }
}

/* title-block row */
[data-design="b"] .rf-hero__titleblock {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 12px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
}
[data-design="b"] .rf-hero__sheet-id { color: var(--guide); }

/* hero content */
[data-design="b"] .rf-hero__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
[data-design="b"] .rf-hero__headline {
  font-family: var(--font-display);
  font-size: var(--t-hero);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--ink);
  opacity: 1; /* hard: visible at first paint */
  margin: 0;
}
[data-design="b"] .rf-hero__subtitle {
  font-size: clamp(14px, 1.6vw, 18px);
  line-height: 1.5;
  color: var(--ink-2);
  opacity: 1;
  margin: 0;
  max-width: 60ch;
}
[data-design="b"] .rf-hero__proof {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 1;
  margin: 0;
}

/* ================================================================
   ELEMENT 2 — Animated CTA (phone, tel: link)
   ================================================================ */
[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: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--r-1);
  border: none;
  transition: transform var(--dur-fast) var(--ease-snap), background var(--dur-fast) var(--ease-snap);
  overflow: hidden;
  min-height: 52px;
  align-self: flex-start;
  cursor: pointer;
}
[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--secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
[data-design="b"] .rf-cta--secondary::before { display: none; }
[data-design="b"] .rf-cta--secondary .rf-cta__shaft { stroke: var(--ink); }
[data-design="b"] .rf-cta--secondary .rf-cta__head { stroke: var(--ink); }
[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: exsysb-cta-breath 4.4s ease-in-out infinite;
}
[data-design="b"] .rf-cta--secondary .rf-cta__rule { background: var(--sys-mechanical); }
[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; }

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

/* ================================================================
   ELEMENT 6 — Pointer
   Immediate preceding sibling of #funnel
   height > 8px (enforced: 40px min)
   opacity: 1
   ================================================================ */
[data-design="b"] [data-mf-role="pointer"] {
  display: flex;
  align-items: stretch;
  padding: 0 clamp(16px, 4vw, 40px);
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--ink);
  opacity: 1;
  min-height: 40px; /* hard: >8px */
}
[data-design="b"] .exsys-pointer__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 10px 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
[data-design="b"] .exsys-pointer__counter {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
[data-design="b"] .exsys-pointer__counter-label { color: var(--guide); }
[data-design="b"] .exsys-pointer__counter-now {
  display: inline-block;
  min-width: 1ch;
  color: var(--ink);
  font-weight: 700;
  animation: exsysb-pointer-tick 320ms ease-out;
}
[data-design="b"] .exsys-pointer__bar {
  position: relative;
  flex: 1;
  height: 2px;
  background: var(--rule);
  overflow: hidden;
}
[data-design="b"] .exsys-pointer__bar-fill {
  position: absolute;
  inset: 0;
  width: var(--exsysb-pointer-progress, 16%);
  background: var(--sys-structural);
  transition: width 480ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
[data-design="b"] .exsys-pointer__chev {
  font-size: 20px;
  color: var(--sys-structural);
  opacity: 0.7;
  animation: exsysb-pointer-chev 4s ease-in-out infinite;
}

@keyframes exsysb-pointer-tick {
  0%   { transform: translateY(-6px); opacity: 0; }
  100% { transform: translateY(0);    opacity: 1; }
}
@keyframes exsysb-pointer-chev {
  0%, 100% { transform: translateX(0);   opacity: 0.45; }
  50%      { transform: translateX(4px); opacity: 0.9; }
}

/* ================================================================
   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 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 12px;
  text-transform: uppercase;
}
[data-design="b"] .rf-funnel__masthead .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--ink);
}
[data-design="b"] .rf-funnel__index {
  list-style: none;
  padding: 16px 0 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(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;
  color: var(--ink);
}
[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-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--area { resize: vertical; }
[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: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transform: rotate(-2deg);
  animation: exsysb-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: exsysb-issued-stamp 480ms var(--ease-snap);
}
[data-design="b"] .rf-funnel__thanks { font-size: 18px; line-height: 1.5; color: var(--ink); margin: 0; }
[data-design="b"] .rf-funnel__thanks a { color: var(--sys-structural); }
[data-design="b"] .rf-funnel__emergency-note { margin-top: 16px; padding: 16px; border: 1px solid var(--rule); background: var(--paper-2); }
[data-design="b"] .rf-funnel__emergency-note[hidden] { display: none; }
[data-design="b"] .rf-emergency-call {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--sys-structural);
  text-decoration: none;
  letter-spacing: -0.01em;
  display: inline-block;
  margin-top: 8px;
  min-height: 44px;
  display: flex;
  align-items: center;
}

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

/* ================================================================
   ELEMENT 4 — Ambient B (services exploded view)
   ================================================================ */
[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 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 16px;
  text-transform: uppercase;
}
[data-design="b"] .rf-ambient-b__head .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 20px;
  color: var(--ink);
}
[data-design="b"] .rf-ambient-b__head .rf-body { font-size: 16px; line-height: 1.6; color: var(--ink-2); }
[data-design="b"] .rf-ambient-b__motion {
  margin: 0 0 56px;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--rule);
}
[data-design="b"] .rf-ambient-b__motion svg { width: 100%; height: auto; display: block; color: var(--ink); }
[data-design="b"] .rf-layer polygon {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1.5;
  transform-origin: 50% 50%;
  transition: transform var(--dur-base) var(--ease-snap);
}
[data-design="b"] .rf-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-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: exsysb-layer-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 exsysb-layer-lift {
  0%, 90%, 100% { transform: translateY(0); }
  30%, 60%      { transform: translateY(-12px); }
}

/* Services index ledger */
[data-design="b"] .rf-services-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  border: 1px solid var(--rule);
  background: var(--rule);
}
[data-design="b"] .rf-sheet {
  background: var(--paper);
  padding: var(--gap-block);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
[data-design="b"] .rf-sheet__titleblock {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 8px;
}
[data-design="b"] .rf-sheet__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--guide);
  letter-spacing: 0.1em;
}
[data-design="b"] .rf-sheet__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
[data-design="b"] .rf-sheet__spec { font-size: 14px; line-height: 1.55; color: var(--ink-2); margin: 0; }
[data-design="b"] .rf-sheet__promo {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--sys-structural);
  letter-spacing: 0.06em;
  margin-top: auto;
}
[data-design="b"] .rf-inline-tel { color: var(--sys-structural); text-decoration: none; }
[data-design="b"] .rf-inline-tel:hover { text-decoration: underline; }

/* ================================================================
   ELEMENT 3 — Ambient A (service area)
   ================================================================ */
[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 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 24px;
  text-transform: uppercase;
}
[data-design="b"] .rf-ambient-a__copy .rf-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 24px;
  color: var(--ink);
}
[data-design="b"] .rf-ambient-a__copy .rf-body { font-size: 16px; line-height: 1.6; color: var(--ink-2); max-width: 48ch; margin: 0 0 24px; }
[data-design="b"] .rf-area-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin: 0 0 32px;
}
[data-design="b"] .rf-area-list li {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.06em;
  padding: 4px 8px;
  border: 1px solid var(--rule);
}
[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;
}
[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: exsysb-run-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 exsysb-run-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__notes { max-width: 1100px; }
[data-design="b"] .rf-about__notes .rf-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 16px;
  text-transform: uppercase;
}
[data-design="b"] .rf-about__notes .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 40px;
  color: var(--ink);
}
[data-design="b"] .rf-about__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}
[data-design="b"] .rf-about__col .rf-field__label { margin-bottom: 12px; }
[data-design="b"] .rf-body-text { font-size: 16px; line-height: 1.65; color: var(--ink-2); }
[data-design="b"] .rf-about__photo-wrap {
  border: 1px solid var(--rule);
  max-width: 640px;
}
[data-design="b"] .rf-about__photo {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ================================================================
   FOOTER
   ================================================================ */
[data-design="b"] .rf-footer {
  background: var(--paper);
  border-top: 1px solid var(--ink);
  padding: var(--gap-section-m) clamp(16px, 4vw, 40px) 0;
}
[data-design="b"] .rf-footer__cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--rule);
}
[data-design="b"] .rf-footer__col { display: flex; flex-direction: column; gap: 6px; }
[data-design="b"] .rf-footer__col .rf-field__label { margin-bottom: 6px; }
[data-design="b"] .rf-footer__tel {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  min-height: 44px;
  display: flex;
  align-items: center;
}
[data-design="b"] .rf-footer__tel:hover { color: var(--sys-structural); }
[data-design="b"] .rf-footer__email {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  margin-top: 4px;
}
[data-design="b"] .rf-footer__email:hover { color: var(--sys-mechanical); }
[data-design="b"] .rf-footer__hours,
[data-design="b"] .rf-footer__address { font-size: 14px; line-height: 1.6; color: var(--ink-2); font-style: normal; }
[data-design="b"] .rf-footer__area { font-size: 13px; line-height: 1.6; color: var(--ink-2); }
[data-design="b"] .rf-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--ink);
  margin-top: 0;
  flex-wrap: wrap;
}
[data-design="b"] .rf-footer__copy { font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 0.06em; }
[data-design="b"] .rf-footer__rev { color: var(--muted); }
[data-design="b"] .rf-meta { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--muted); }

/* ================================================================
   RESPONSIVE — mobile-first breakpoints
   Every rule scoped to [data-design="b"]
   ================================================================ */
@media (max-width: 900px) {
  [data-design="b"] .rf-ambient-a { grid-template-columns: 1fr; gap: 40px; padding: var(--gap-section-m) clamp(16px, 4vw, 32px); }
  [data-design="b"] .rf-ambient-a__motion { justify-self: stretch; max-width: 100%; }
  [data-design="b"] .rf-about__cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  [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-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 [data-stamp] { margin-left: 0; order: -1; }
  [data-design="b"] .rf-about__cols { grid-template-columns: 1fr; gap: 32px; }
}
@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-ambient-a { padding: var(--gap-section-s) 16px; }
  [data-design="b"] .rf-hero { padding-bottom: 48px; }
}
@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: 0.9; }
  [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"] .b-pipe { animation: none; stroke-dashoffset: 0; opacity: 1; }
  [data-design="b"] .b-gauge,
  [data-design="b"] .b-gauge-inner,
  [data-design="b"] .b-gauge-hand,
  [data-design="b"] .b-dim,
  [data-design="b"] .b-dim-label { animation: none; opacity: 1; }
  [data-design="b"] .b-flow--m,
  [data-design="b"] .b-flow--s,
  [data-design="b"] .b-flow--e { animation: none; opacity: 1; }
  [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"] .exsys-pointer__counter-now,
  [data-design="b"] .exsys-pointer__chev,
  [data-design="b"] .exsys-pointer__bar-fill { animation: none; transition: none; }
}

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

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