/* ==========================================================================
   FOSTER ENGINEERING CALCULATORS — component layer
   Ported from the Izhar Foster calculator suite (js/tools/*, css/style.v2.css)
   and re-themed onto Foster Refrigerators USA brand tokens.

   Scope: only the /tools/* pages load this file. Internal component classes
   (.calc-*, .btn*, .tools-*) are self-contained here and do not collide with
   the site-wide .fc-* system used elsewhere (app.css, article.css).
   ========================================================================== */

:root {
  /* ---- palette bridge: Izhar var name -> Foster brand value ----
     IMPORTANT: bridge to the RAW tokens Foster's dark-mode block actually
     redefines (--fc-paper, --fc-mist, --fc-steel-*, --fc-navy-ink, --fc-orange),
     NOT the semantic --fc-bg/--fc-text/--fc-border/--fc-accent aliases —
     those are only ever set once, in the light :root, and never flip. */
  --t-cold:     var(--fc-navy-ink);     /* was Izhar glacier navy -> Foster navy-ink (flips light in dark mode) */
  --t-mid:      #2E86C1;                /* signal blue accent, between navy and CTA blue */
  --t-warm:     var(--fc-orange);       /* CTA accent: Foster blue (was Izhar ember orange) — flips brighter in dark mode */

  --paper:      var(--fc-paper);
  --paper-2:    var(--fc-mist);
  --paper-3:    var(--fc-steel-100);

  --ink:        var(--fc-steel-950);
  --ink-2:      var(--fc-navy-ink);
  --muted:      var(--fc-steel-500);
  --line:       var(--fc-steel-100);
  --line-2:     rgba(15,20,25,.07);

  --font-display: var(--fc-font-display);
  --font-body:    var(--fc-font-body);
  --font-mono:    var(--fc-font-mono);

  --r-xs:  var(--fc-r-sm);
  --r-sm:  var(--fc-r-md);
  --r-md:  var(--fc-r-lg);

  --container: 1320px;
  --gutter: clamp(20px, 4vw, 56px);
  --mb-x: 20px;
  --default-dur: 4s;
}
:root[data-theme="dark"] {
  --line-2: rgba(238,242,248,.09);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --line-2: rgba(238,242,248,.09); }
}

/* ---------- base button (calculator-local; distinct from site .fc-btn) ---------- */
.calc-page .btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px;
  font-family: var(--font-display);
  font-size: .94rem; font-weight: 500;
  letter-spacing: -.005em;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: transparent; /* reset native <button> UA gray chrome */
  color: var(--ink);
  transition: all .2s ease;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
}
.calc-page .btn-primary { background: var(--ink); color: var(--paper); }
.calc-page .btn-primary:hover { background: var(--t-warm); }
.calc-page .btn-warm { background: var(--t-warm); color: #fff; }
.calc-page .btn-warm:hover { background: var(--ink); }
.calc-page .btn-outline { color: var(--ink); border-color: var(--ink); }
.calc-page .btn-outline:hover { background: var(--ink); color: var(--paper); }
.calc-page .btn-ghost { color: var(--ink); }
.calc-page .btn-ghost:hover { color: var(--t-warm); }
.calc-page .btn-sm { padding: 9px 16px; font-size: .85rem; }
.calc-page .btn-lg { padding: 17px 30px; font-size: 1rem; }
.calc-page .btn .arr { transition: transform .2s; display: inline-block; }
.calc-page .btn:hover .arr { transform: translateX(4px); }

.calc-titlebar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px var(--gutter);
  border-bottom: 1px solid var(--line-2);
  gap: 16px;
  flex-wrap: wrap;
}
.calc-eyebrow {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
}
.calc-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 0;
}
.calc-breadcrumb {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--muted);
  display: flex; gap: 8px; align-items: center;
}
.calc-breadcrumb a { color: var(--ink-2); }
.calc-breadcrumb a:hover { color: var(--t-warm); }
.calc-breadcrumb .sep { color: var(--paper-3); }

.calc-titlebar-actions {
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: .82rem;
}
.calc-jobmode-badge {
  display: inline-flex; align-items: center;
  padding: 6px 10px;
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-right: 4px;
}
.calc-jobmode-badge::before {
  content: ""; display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--t-warm); margin-right: 6px;
}

.calc-units-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  background: var(--paper-2);
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 500;
}
.calc-units-toggle button {
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--muted);
  border: 0;
  background: transparent;
  cursor: pointer;
  transition: all .15s;
}
.calc-units-toggle button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- Two-column layout ---------- */
.calc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 32px;
  padding: 32px var(--gutter) 80px;
  max-width: var(--container);
  margin: 0 auto;
}
.calc-form { min-width: 0; max-width: 720px; }
.calc-aside {
  min-width: 0;
  display: flex; flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 96px;
  align-self: flex-start;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  scrollbar-width: thin;
}
@media (max-width: 900px) {
  .calc-grid { grid-template-columns: 1fr; gap: 24px; }
  .calc-aside { position: static; max-height: none; overflow: visible; }
}

/* ---------- Form sections + fields ---------- */
.calc-section {
  padding: 28px 0;
  border-top: 1px solid var(--line-2);
}
.calc-section:first-of-type { border-top: 0; padding-top: 0; }
.calc-section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.calc-section-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 4px 0 0;
}
.calc-section-head .calc-eyebrow { display: block; }
.calc-glossary-trigger {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--muted);
  cursor: help;
  border: 0;
  background: transparent;
  padding: 4px 8px;
  border-radius: var(--r-sm);
}
.calc-glossary-trigger:hover { color: var(--t-warm); background: var(--paper-2); }

.calc-section-body {
  display: flex; flex-direction: column;
  gap: 14px;
}

.calc-field {
  display: grid;
  grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  align-items: center;
  gap: 16px;
}
.calc-field-label {
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-align: right;
  line-height: 1.3;
}
.calc-field-input {
  position: relative;
  display: flex; align-items: stretch;
}
.calc-field-hint {
  grid-column: 2;
  font-size: .8rem;
  color: var(--muted);
  margin-top: 2px;
  line-height: 1.4;
}
.calc-field-error {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--t-warm);
  margin-top: 2px;
}
.calc-field-error::before { content: '\2717  '; }

@media (max-width: 600px) {
  .calc-field { grid-template-columns: 1fr; gap: 6px; }
  .calc-field-label { text-align: left; font-size: .76rem; }
  .calc-field-hint, .calc-field-error { grid-column: 1; }
}

/* ---------- Numeric inputs + unit chips + selects + segmented ---------- */
.calc-num {
  font-family: var(--font-mono);
  font-feature-settings: 'tnum';
  font-size: 1rem;
  font-weight: 500;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  color: var(--ink);
  width: 100%;
  min-height: 44px;
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.calc-num::-webkit-outer-spin-button,
.calc-num::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.calc-num[type=number] { -moz-appearance: textfield; }
.calc-num:focus { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(31,111,178,.2); }
.calc-num:disabled { background: var(--paper-2); color: var(--muted); cursor: not-allowed; }

.calc-num-with-unit {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  transition: border-color .15s, box-shadow .15s;
}
.calc-num-with-unit:focus-within {
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(31,111,178,.2);
}
.calc-num-with-unit .calc-num {
  border: 0;
  box-shadow: none;
  border-radius: 0;
  background: transparent;
}
.calc-num-with-unit .calc-num:focus { box-shadow: none; }
.calc-num-unit {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--muted);
  display: flex; align-items: center;
  padding: 0 14px;
  border-left: 1px solid var(--line-2);
  background: var(--paper-2);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.calc-select {
  font-family: var(--font-body);
  font-size: .94rem;
  padding: 12px 36px 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  color: var(--ink);
  width: 100%;
  min-height: 44px;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' stroke='%230F1419' fill='none' stroke-width='1.5'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  cursor: pointer;
}
.calc-select:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(31,111,178,.2);
}

.calc-segmented {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper-2);
  padding: 3px;
  width: 100%;
  gap: 2px;
}
.calc-segmented button {
  flex: 1;
  padding: 9px 12px;
  border: 0; background: transparent; cursor: pointer;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  border-radius: var(--r-xs);
  transition: all .15s;
}
.calc-segmented button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

/* Radio tiles */
.calc-radio-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}
.calc-radio-tiles input[type="radio"] {
  position: absolute; opacity: 0; pointer-events: none;
}
.calc-radio-tile {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  cursor: pointer;
  transition: all .15s;
}
.calc-radio-tile span:first-child {
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.calc-radio-tile span:last-child {
  font-size: .78rem;
  color: var(--muted);
}
.calc-radio-tiles input[type="radio"]:checked + .calc-radio-tile,
.calc-radio-tile.is-active {
  border-color: var(--ink);
  background: var(--paper-2);
  box-shadow: 0 0 0 1px var(--ink);
}
.calc-radio-tiles input[type="radio"]:focus-visible + .calc-radio-tile {
  box-shadow: 0 0 0 2px var(--t-warm);
}

/* Application tile grid */
.calc-app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  min-height: 880px;
  contain-intrinsic-size: 880px;
}
@media (max-width: 600px) {
  .calc-app-grid {
    grid-template-columns: repeat(2, 1fr);
    min-height: 2200px;
    contain-intrinsic-size: 2200px;
  }
}
@media (max-width: 900px) and (min-width: 601px) {
  .calc-app-grid { min-height: 1500px; contain-intrinsic-size: 1500px; }
}
.calc-app-tile {
  position: relative;
  display: flex; flex-direction: column; gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  cursor: pointer;
  text-align: left;
  transition: all .18s ease;
}
.calc-app-tile:hover {
  transform: translateY(-2px);
  border-color: var(--t-warm);
}
.calc-app-tile.is-active {
  border-color: var(--ink);
  background: var(--paper-2);
  box-shadow: 0 0 0 1px var(--ink);
}
.calc-app-tile .img {
  aspect-ratio: 1.6 / 1;
  background: var(--paper-2);
  border-radius: var(--r-xs);
  overflow: hidden;
  position: relative;
}
.calc-app-tile .img img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.calc-app-tile .name {
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.2;
  letter-spacing: -.01em;
}
.calc-app-tile .preview {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--muted);
  letter-spacing: .04em;
}
.calc-app-tile .badge-us {
  position: absolute;
  top: 6px; right: 6px;
  background: var(--t-warm);
  color: #fff;
  font-family: var(--font-mono);
  font-size: .62rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 3px 6px;
  border-radius: var(--r-xs);
}

/* Stepper */
.calc-stepper {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  align-items: stretch;
}
.calc-stepper button {
  width: 40px;
  border: 0;
  background: transparent;
  font-size: 1.1rem;
  color: var(--ink-2);
  cursor: pointer;
  transition: background .15s;
}
.calc-stepper button:hover { background: var(--paper-2); }
.calc-stepper input {
  width: 60px;
  text-align: center;
  border: 0;
  border-left: 1px solid var(--line-2);
  border-right: 1px solid var(--line-2);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
}
.calc-stepper input:focus { outline: none; }

/* ---------- Visualiser ---------- */
.calc-visualiser {
  display: block;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--paper);
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 10;
  width: 100%;
  min-height: 220px;
  text-decoration: none;
}
.calc-visualiser img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .3s ease;
}
.calc-visualiser:hover img { transform: scale(1.04); }
.calc-visualiser model-viewer {
  width: 100%;
  height: 100%;
  --poster-color: transparent;
  background-color: transparent;
}
.calc-visualiser-fallback {
  width: 100%; height: 100%;
  background: linear-gradient(180deg, var(--paper-2) 0%, var(--paper) 100%);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .85rem;
}
.calc-visualiser-cta {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 14px 16px;
  background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,.72) 100%);
  color: #fff;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .02em;
  display: flex; align-items: center; gap: 6px;
}
.calc-visualiser-cta .arr { transition: transform .2s; }
.calc-visualiser:hover .calc-visualiser-cta .arr { transform: translateX(4px); }
.calc-visualiser-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.calc-visualiser-chip {
  position: absolute;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  padding: 4px 8px;
  border-radius: var(--r-xs);
  pointer-events: none;
  white-space: nowrap;
}
.calc-visualiser-chip.is-cold { color: var(--t-cold); border-color: rgba(0,35,90,.2); }
.calc-visualiser-chip.is-warm { color: var(--t-warm); border-color: rgba(31,111,178,.3); }

.calc-visualiser-controls {
  position: absolute;
  bottom: 10px; left: 10px;
  display: flex; gap: 6px;
  pointer-events: auto;
}
.calc-visualiser-controls button {
  font-family: var(--font-mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  background: rgba(255,255,255,.92);
  color: var(--ink-2);
  cursor: pointer;
}
.calc-visualiser-controls button:hover { background: var(--paper-2); border-color: var(--ink); }

/* ---------- Heat-flow animation ---------- */
.calc-heatflow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.calc-heatflow-arrow {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--t-warm);
  opacity: 0;
  animation: heat-arrow-drift 4s linear infinite;
}
.calc-heatflow-arrow.cold {
  color: var(--t-mid);
  font-size: .85rem;
  animation: cold-particle-fall 5s linear infinite;
}
.calc-heatflow-arrow.glow {
  color: var(--t-mid);
  filter: blur(3px);
  font-size: 2rem;
  animation: respiration-pulse 3s ease-in-out infinite;
}
.calc-heatflow-burst {
  position: absolute;
  width: 80px; height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(31,111,178,.42) 0%, rgba(31,111,178,0) 60%);
  opacity: 0;
  animation: door-burst 8s ease-out infinite;
  pointer-events: none;
}
.calc-heatflow-defrost {
  position: absolute;
  width: 60px; height: 8px;
  background: linear-gradient(90deg, transparent, var(--t-warm), transparent);
  opacity: 0;
  animation: defrost-flash 12s ease-out infinite;
}

@keyframes heat-arrow-drift {
  0%   { opacity: 0; transform: translateX(0); }
  20%  { opacity: .55; }
  80%  { opacity: .35; }
  100% { opacity: 0; transform: translateX(40px); }
}
@keyframes cold-particle-fall {
  0%   { opacity: 0; transform: translateY(0); }
  20%  { opacity: .55; }
  100% { opacity: 0; transform: translateY(60px); }
}
@keyframes respiration-pulse {
  0%, 100% { opacity: .12; transform: scale(0.9); }
  50%      { opacity: .42; transform: scale(1.1); }
}
@keyframes door-burst {
  0%, 95%, 100% { opacity: 0; transform: scale(0.4); }
  96%           { opacity: 1; transform: scale(0.4); }
  98%           { opacity: .8; transform: scale(1.4); }
  99%           { opacity: 0;  transform: scale(2); }
}
@keyframes defrost-flash {
  0%, 90%, 100% { opacity: 0; transform: translateX(0); }
  92%           { opacity: 1; }
  98%           { opacity: 0; transform: translateX(20px); }
}

.calc-heatflow.is-static .calc-heatflow-arrow,
.calc-heatflow.is-static .calc-heatflow-burst,
.calc-heatflow.is-static .calc-heatflow-defrost {
  animation: none;
  opacity: 0;
}
.calc-heatflow.is-slow .calc-heatflow-arrow,
.calc-heatflow.is-slow .calc-heatflow-burst,
.calc-heatflow.is-slow .calc-heatflow-defrost {
  animation-duration: calc(var(--default-dur, 4s) * 2.5);
}

@media (prefers-reduced-motion: reduce) {
  .calc-heatflow .calc-heatflow-arrow,
  .calc-heatflow .calc-heatflow-burst,
  .calc-heatflow .calc-heatflow-defrost { animation: none; opacity: 0; }
}

/* ---------- Result panel ---------- */
.calc-result {
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  background: var(--paper);
  padding: 22px;
  display: flex; flex-direction: column;
  gap: 16px;
}
.calc-result-head .calc-eyebrow { display: block; margin-bottom: 8px; }
.calc-result-big {
  font-family: var(--font-mono);
  font-feature-settings: 'tnum';
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  font-weight: 600;
  letter-spacing: -.03em;
  color: var(--t-warm);
  line-height: 1;
}
.calc-result-sub {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--muted);
  margin-top: 4px;
  letter-spacing: .02em;
}

.calc-breakdown-card {
  margin: 18px 0 14px;
  padding: 16px 18px;
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
}
.calc-breakdown-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 12px;
  flex-wrap: wrap;
}
.calc-breakdown-largest {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--t-warm);
  letter-spacing: .04em;
}
.calc-breakdown-bar {
  display: flex;
  height: 22px;
  border-radius: var(--r-sm);
  overflow: hidden;
  margin-top: 4px;
  background: var(--paper-3);
  position: relative;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.04);
}
.calc-breakdown-bar > div {
  transition: flex .32s cubic-bezier(.4,0,.2,1), opacity .15s;
  min-width: 2px;
  position: relative;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: .68rem;
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,.25);
  letter-spacing: .04em;
  font-weight: 500;
  cursor: default;
  overflow: hidden;
  white-space: nowrap;
}
.calc-breakdown-bar > div[data-pct]:not([data-pct="0"])::before {
  content: attr(data-pct) "%";
}
.calc-breakdown-bar > div[data-pct]:hover { opacity: .82; }
.calc-breakdown-row {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line-2);
  font-size: .9rem;
  cursor: default;
  transition: background .12s;
}
.calc-breakdown-row:hover { background: rgba(31,111,178,.04); }
.calc-breakdown-row:last-child { border-bottom: 0; }
.calc-breakdown-row .swatch {
  width: 10px; height: 10px; border-radius: var(--r-xs);
}
.calc-breakdown-row .label { color: var(--ink-2); }
.calc-breakdown-row .value {
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 500;
  color: var(--ink);
}
.calc-breakdown-row .pct {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--muted);
  min-width: 36px;
  text-align: right;
}

/* ---------- A vs B comparison chart ---------- */
.calc-compare-card {
  margin: 14px 0;
  padding: 16px 18px;
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-radius: var(--r-xs);
}
.calc-compare-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 10px;
  flex-wrap: wrap;
}
.calc-compare-toggle {
  display: inline-flex;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 2px;
  background: var(--paper);
}
.calc-compare-toggle button {
  padding: 4px 12px;
  border: 0;
  background: transparent;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  border-radius: 999px;
  transition: all .15s;
}
.calc-compare-toggle button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}
.calc-compare-chart {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.calc-compare-row {
  display: grid;
  grid-template-columns: minmax(110px, 130px) minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}
.calc-compare-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  color: var(--ink-2);
  font-weight: 500;
}
.calc-compare-dot {
  width: 10px; height: 10px; border-radius: var(--r-xs);
  flex-shrink: 0;
}
.calc-compare-track {
  height: 28px;
  background: var(--paper);
  border-radius: var(--r-xs);
  overflow: hidden;
  position: relative;
}
.calc-compare-bar {
  height: 100%;
  width: 0;
  transition: width .5s cubic-bezier(.4,0,.2,1);
  border-radius: var(--r-xs);
}
.calc-compare-amt {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 600;
  color: var(--ink);
  text-align: right;
  white-space: nowrap;
  min-width: 90px;
}
.calc-compare-savings {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  padding: 10px 14px;
  background: linear-gradient(90deg, rgba(46,134,193,.10) 0%, rgba(31,111,178,.10) 100%);
  border-radius: var(--r-xs);
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--muted);
  letter-spacing: .04em;
}
.calc-compare-savings strong {
  font-size: .98rem;
  color: var(--t-warm);
  font-weight: 600;
}
.calc-compare-foot {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--muted);
}

/* ---------- Visualiser stat strip ---------- */
.calc-viz-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-2);
  border: 1px solid var(--line-2);
  border-top: 0;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  margin-top: -5px;
}
.calc-viz-stat {
  background: var(--paper-2);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.calc-viz-stat .calc-eyebrow {
  font-size: .68rem;
}
.calc-viz-stat strong {
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -.01em;
  line-height: 1.3;
}
@media (max-width: 720px) {
  .calc-viz-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.calc-cost {
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  padding: 14px 16px;
  font-family: var(--font-mono);
}
.calc-cost-label {
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.calc-cost-value {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--ink);
  margin-top: 2px;
}
.calc-cost-tariff {
  margin-top: 6px;
  font-size: .8rem;
  color: var(--muted);
  display: flex; align-items: center; gap: 6px;
}
.calc-cost-tariff input {
  width: 56px;
  font-family: var(--font-mono);
  font-size: .85rem;
  font-weight: 500;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  padding: 3px 6px;
  background: var(--paper);
  text-align: center;
}

.calc-cta-pair {
  display: flex; gap: 10px;
  flex-wrap: wrap;
}
.calc-cta-pair .btn { flex: 1 1 auto; justify-content: center; min-width: 0; padding-left: 14px; padding-right: 14px; }

.calc-show-math {
  border-top: 1px solid var(--line-2);
  padding-top: 14px;
  margin-top: 4px;
}
.calc-show-math summary {
  font-family: var(--font-mono);
  font-size: .85rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--ink-2);
  cursor: pointer;
  list-style: none;
  user-select: none;
  display: flex; align-items: center; gap: 6px;
}
.calc-show-math summary::-webkit-details-marker { display: none; }
.calc-show-math summary::after {
  content: '\2192';
  margin-left: auto;
  transition: transform .2s;
  color: var(--t-warm);
}
.calc-show-math[open] summary::after { transform: rotate(90deg); }
.calc-show-math summary:hover { color: var(--t-warm); }
.calc-show-math-body {
  font-family: var(--font-mono);
  font-size: .8rem;
  line-height: 1.6;
  color: var(--ink-2);
  background: var(--paper-2);
  padding: 14px;
  border-radius: var(--r-xs);
  margin-top: 12px;
  white-space: pre-wrap;
}

.calc-disclaimer {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--muted);
  line-height: 1.5;
  letter-spacing: .02em;
  border-top: 1px solid var(--line-2);
  padding-top: 12px;
  margin-top: 4px;
}

/* ---------- Modals ---------- */
.calc-modal {
  position: fixed; inset: 0;
  background: rgba(10,15,25,.5);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}
.calc-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}
.calc-modal-card {
  background: var(--paper);
  border-radius: var(--r-sm);
  max-width: 720px;
  width: 100%;
  max-height: 80vh;
  overflow: hidden;
  display: flex; flex-direction: column;
}
@media (max-width: 600px) {
  .calc-modal { padding: 0; align-items: flex-end; }
  .calc-modal-card { max-height: 88vh; border-radius: var(--r-sm) var(--r-sm) 0 0; }
}
.calc-modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line-2);
}
.calc-modal-head h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}
.calc-modal-close {
  border: 0; background: transparent;
  font-size: 1.4rem; line-height: 1;
  color: var(--muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--r-xs);
}
.calc-modal-close:hover { background: var(--paper-2); color: var(--ink); }
.calc-modal-body {
  padding: 20px;
  overflow-y: auto;
  font-size: .92rem;
  line-height: 1.6;
  color: var(--ink-2);
}

/* ---------- Tools index page ---------- */
.tools-hero {
  padding: clamp(120px, 12vw, 160px) var(--gutter) clamp(40px, 6vw, 70px);
  max-width: var(--container);
  margin: 0 auto;
}
.tools-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.4rem, 5.6vw, 4.4rem);
  letter-spacing: -.03em;
  line-height: 1.05;
  color: var(--ink);
  max-width: 18ch;
  margin-top: 14px;
}
.tools-hero h1 em {
  font-style: italic;
  background: linear-gradient(90deg, var(--t-cold) 0%, var(--t-mid) 50%, var(--t-warm) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  padding-right: .14em;
  -webkit-box-decoration-break: clone;
}
.tools-hero p.lead {
  font-size: clamp(1rem, 1.4vw, 1.16rem);
  color: var(--ink-2);
  max-width: 60ch;
  line-height: 1.5;
  margin-top: 18px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  padding: 0 var(--gutter) clamp(60px, 8vw, 100px);
  max-width: var(--container);
  margin: 0 auto;
}
.tools-card {
  display: flex; flex-direction: column;
  padding: 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  text-decoration: none;
  color: var(--ink);
  position: relative;
  transition: all .2s ease;
  min-height: 220px;
}
.tools-card:hover {
  transform: translateY(-3px);
  border-color: var(--t-warm);
  background: var(--paper-2);
}
.tools-card:hover .arr { transform: translateX(4px); color: var(--t-warm); }
/* Always-dark feature card (Build & Quote) — stays dark in both themes,
   matching the site's footer/hero-duo-card convention. Do not use --t-cold
   here since it flips light in dark mode. */
.tools-card-feature {
  border-color: var(--fc-navy) !important;
  background: var(--fc-surface-dark, var(--fc-navy)) !important;
}
.tools-card-feature:hover { border-color: var(--t-warm) !important; }
.tools-card .num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
}
.tools-card h3 {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 14px 0 10px;
  line-height: 1.18;
}
.tools-card p {
  font-size: .92rem;
  color: var(--ink-2);
  line-height: 1.5;
  margin-bottom: 18px;
}
.tools-card .meta {
  margin-top: auto;
  display: flex; gap: 10px; align-items: center;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--muted);
}
.tools-card .meta .tag {
  background: var(--paper-2);
  padding: 4px 8px;
  border-radius: var(--r-xs);
  letter-spacing: .04em;
}
.tools-card .meta .tag.us { background: rgba(31,111,178,.12); color: var(--t-warm); }
.tools-card .arr {
  position: absolute;
  bottom: 26px; right: 26px;
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: transform .2s, color .2s;
  color: var(--ink);
}

.tools-trust {
  background: var(--paper-2);
  padding: clamp(40px, 6vw, 70px) var(--gutter);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}
.tools-trust .container {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 32px;
  align-items: start;
}
@media (max-width: 800px) {
  .tools-trust .container { grid-template-columns: 1fr; }
}
.tools-trust h3 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--ink);
  margin-top: 12px;
}
.tools-trust .citations {
  display: flex; flex-direction: column; gap: 12px;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--ink-2);
  line-height: 1.5;
}
.tools-trust .citations span {
  display: block;
  padding: 8px 12px;
  background: var(--paper);
  border-left: 2px solid var(--t-mid);
}

/* ---------- Mobile: sticky result sheet ---------- */
@media (max-width: 720px) {
  .calc-grid {
    display: block !important;
    padding: 20px var(--mb-x) 120px !important;
  }
  .calc-aside { display: none !important; }
}
.calc-result-sheet { display: none; }
@media (max-width: 720px) {
  .calc-result-sheet {
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 80;
    background: var(--paper);
    border-top: 1px solid var(--line);
    border-radius: 16px 16px 0 0;
    box-shadow: 0 -8px 40px -8px rgba(0,35,90,.18);
    max-height: 140px;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    overflow: hidden;
    transition: max-height .32s cubic-bezier(.4,0,.2,1);
    will-change: max-height;
  }
  .calc-result-sheet.is-expanded {
    max-height: 82vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .calc-result-sheet-handle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px var(--mb-x);
    min-height: 72px;
    cursor: pointer;
    flex-shrink: 0;
    gap: 12px;
  }
  .calc-result-sheet-handle:active { background: var(--paper-2); }
  .calc-result-sheet-handle .calc-result-sub {
    font-family: var(--font-mono);
    font-size: .68rem;
    color: var(--muted);
    margin-top: 4px;
    line-height: 1.35;
    white-space: normal;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    max-width: 100%;
  }
  .calc-result-sheet-handle > div:first-child {
    min-width: 0;
    flex: 1 1 auto;
  }
  .calc-result-sheet-num {
    font-family: var(--font-mono);
    font-feature-settings: 'tnum';
    font-size: clamp(1.6rem, 6vw, 2.1rem);
    font-weight: 600;
    letter-spacing: -.03em;
    color: var(--t-warm);
    line-height: 1;
  }
  .calc-result-sheet-label {
    font-family: var(--font-mono);
    font-size: .6rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 3px;
  }
  .calc-result-sheet-chevron {
    width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    flex-shrink: 0;
    transition: transform .25s ease;
    color: var(--ink-2);
    font-size: .85rem;
    line-height: 1;
  }
  .calc-result-sheet.is-expanded .calc-result-sheet-chevron {
    transform: rotate(180deg);
  }
  .calc-result-sheet-inner {
    padding: 0 var(--mb-x) calc(var(--mb-x) + env(safe-area-inset-bottom, 0px));
    display: flex;
    flex-direction: column;
    gap: 14px;
  }
  .calc-result-sheet-inner .calc-result {
    border: none !important;
    border-radius: 0 !important;
    padding: 0 !important;
    box-shadow: none !important;
  }
  .calc-result-sheet.is-expanded .calc-result-sheet-handle {
    min-height: 0;
    height: 44px;
    justify-content: flex-end;
    padding: 0 var(--mb-x);
    border-bottom: 1px solid var(--line-2);
  }
  .calc-result-sheet.is-expanded .calc-result-sheet-label,
  .calc-result-sheet.is-expanded .calc-result-sheet-num,
  .calc-result-sheet.is-expanded .calc-result-sheet-handle .calc-result-sub {
    display: none;
  }
  .calc-result-sheet.is-expanded .calc-result-sheet-handle::before {
    content: 'Close';
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .06em;
    color: var(--muted);
    flex: 1;
    text-align: right;
    margin-right: 8px;
  }
  .calc-result-sheet-inner .calc-result-head {
    display: none;
  }
}

/* ---------- Print ---------- */
@media print {
  .site-nav, .site-nav-drawer, .site-foot, .calc-titlebar,
  .calc-cta-pair, .site-nav-toggle { display: none !important; }
}