:root {
  --bg: #f3eee7;
  --bg-strong: #ece5dc;
  --paper: rgba(255, 250, 244, 0.72);
  --ink: #191613;
  --muted: #6b6057;
  --line: rgba(25, 22, 19, 0.12);
  --line-strong: rgba(25, 22, 19, 0.24);
  --accent: #d64c2f;
  --sage: #79866d;
  --sand: #d8cab8;
  --system-green: rgba(124, 210, 94, 0.52);
  --shadow: 0 24px 80px rgba(39, 31, 23, 0.08);
  --ui-font: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --display-font: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, serif;
  --mono-font: "SFMono-Regular", Menlo, Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--ui-font);
  background:
    radial-gradient(circle at top left, rgba(214, 76, 47, 0.08), transparent 28%),
    linear-gradient(180deg, #f8f4ee 0%, var(--bg) 24%, #f7f1e9 100%);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
dialog {
  font: inherit;
}

.site-shell {
  position: relative;
  overflow: clip;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.2rem 1.5rem 1rem;
  backdrop-filter: blur(18px);
  background: linear-gradient(180deg, rgba(243, 238, 231, 0.88), rgba(243, 238, 231, 0.5));
  border-bottom: 1px solid rgba(25, 22, 19, 0.08);
}

.brand {
  display: inline-grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto auto;
  column-gap: 0.85rem;
  align-items: center;
  text-transform: uppercase;
}

.brand-copy {
  display: contents;
}

.brand-mark {
  grid-column: 2;
  grid-row: 1;
  font-size: 0.88rem;
  letter-spacing: 0.24em;
  font-weight: 700;
}

.brand-subtitle {
  grid-column: 2;
  grid-row: 2;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.brand-icon {
  grid-column: 1;
  grid-row: 1 / span 2;
  width: 3.1rem;
  height: 3.1rem;
  border-radius: 0.9rem;
  object-fit: contain;
}

.masthead-badge {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  background: rgba(25, 22, 19, 0.06);
  color: var(--muted);
  font-size: 0.8rem;
}

.calculator-main {
  display: grid;
  gap: 1.5rem;
  padding: 2rem 1.5rem 4rem;
}

.calculator-hero,
.calculator-section {
  width: min(100%, 92rem);
  margin: 0 auto;
}

.section-head {
  display: grid;
  gap: 0.5rem;
}

.section-head-tight {
  max-width: 56rem;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
}

.section-head h1,
.story-block h3,
.panel-head h3 {
  margin: 0;
  font-family: var(--display-font);
  font-weight: 500;
  line-height: 0.94;
  letter-spacing: -0.04em;
}

.section-head h1 {
  font-size: clamp(3rem, 6vw, 5.8rem);
  max-width: 12ch;
}

.section-copy,
.story-block p,
.chart-note,
.result-context,
.recommendation-copy,
.brand-copy,
.brand-copy-muted {
  color: var(--muted);
  line-height: 1.6;
}

.lab-workbench {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border-radius: 1.8rem;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background:
    linear-gradient(180deg, rgba(255, 252, 247, 0.92), rgba(246, 239, 230, 0.94));
}

.standalone-hvac-workbench {
  grid-template-columns: minmax(0, 1.18fr) minmax(22rem, 0.82fr);
  align-items: start;
}

.lab-info-column {
  min-width: 0;
  display: grid;
  gap: 0.95rem;
  align-content: start;
}

.lab-intro-block {
  display: grid;
  gap: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.story-block h3 {
  font-size: clamp(1.85rem, 3.4vw, 2.75rem);
  margin-bottom: 0.15rem;
}

.summary-metric {
  display: grid;
  gap: 0.2rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
}

.summary-label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.76rem;
}

.summary-metric strong {
  line-height: 1.35;
}

.lab-readout {
  min-width: 0;
  display: grid;
  gap: 0.8rem;
}

.lab-controls-column {
  min-width: 0;
}

.lab-controls-shell {
  display: grid;
  gap: 0.8rem;
  padding: 0.8rem;
  border-radius: 1.25rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.46);
}

.panel-head {
  display: grid;
  gap: 0.2rem;
  margin-bottom: 0.2rem;
}

.panel-head h3 {
  font-size: clamp(1.35rem, 2.1vw, 1.75rem);
}

.panel-actions {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.panel-reset-button,
.panel-action-button {
  flex: 0 0 auto;
  min-height: 2.2rem;
  padding: 0.45rem 0.82rem;
  border-radius: 999px;
  border: 1px solid rgba(25, 22, 19, 0.12);
  color: var(--ink);
  font-family: var(--mono-font);
  font-size: 0.78rem;
  line-height: 1;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.panel-reset-button {
  background: rgba(255, 255, 255, 0.78);
}

.panel-action-button {
  background: rgba(214, 76, 47, 0.08);
  border-color: rgba(214, 76, 47, 0.18);
}

.panel-reset-button:hover,
.panel-action-button:hover {
  border-color: rgba(25, 22, 19, 0.2);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 24px rgba(25, 22, 19, 0.08);
  transform: translateY(-1px);
}

.panel-reset-button:focus-visible,
.panel-action-button:focus-visible,
.chart-info-button:focus-visible,
.info-modal-close:focus-visible {
  outline: 2px solid rgba(200, 110, 61, 0.34);
  outline-offset: 2px;
}

.hvac-controls-topbar {
  display: grid;
  gap: 0.8rem;
}

.hvac-form {
  display: grid;
  gap: 0.65rem;
  margin-top: 0;
}

.control-group {
  min-width: 0;
  margin: 0;
  padding: 0.7rem;
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.44);
}

.control-group-compact {
  padding: 0.75rem 0.85rem;
}

.control-group-title {
  padding: 0 0.25rem;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.control-group-note {
  margin: 0 0 0.45rem;
  color: var(--muted);
  line-height: 1.28;
  font-size: 0.82rem;
}

.control-group-body {
  display: grid;
  gap: 0.45rem;
}

.control-row {
  display: grid;
  gap: 0.3rem;
}

.control-copy {
  display: block;
}

.control-label {
  display: block;
  font-size: 0.84rem;
  line-height: 1.18;
  font-weight: 600;
}

.control-input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
}

.control-range-wrap {
  min-width: 0;
}

.control-range {
  width: 100%;
  accent-color: var(--accent);
}

.control-value {
  min-width: 5rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.hvac-margin-group {
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.hvac-margin-note {
  margin: 0;
}

.chart-insights {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr));
}

.chart-insight-card {
  display: grid;
  gap: 0.45rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.5);
}

.chart-insight-title {
  margin: 0;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 700;
  font-family: var(--mono-font);
}

.chart-insight-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.chart-insight-row strong {
  color: var(--ink);
  font-size: 0.88rem;
}

.chart-insight-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
  font-size: 0.79rem;
}

.chart-zone-row {
  display: grid;
  grid-template-columns: 3.8rem 1fr;
  gap: 0.6rem;
  align-items: start;
}

.chart-zone-range {
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--mono-font);
}

.chart-zone-copy {
  color: var(--muted);
  font-size: 0.79rem;
  line-height: 1.35;
}

.hvac-results {
  grid-column: 1 / -1;
  display: grid;
  gap: 0.85rem;
}

.result-block {
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

.auto-summary-section + .auto-summary-section {
  margin-top: 0.85rem;
}

.auto-summary-title {
  margin: 0 0 0.65rem;
  font-family: var(--mono-font);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.auto-summary-grid,
.scenario-grid,
.brand-selector-grid {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}

.auto-summary-row,
.scenario-card,
.brand-result {
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.44);
}

.auto-summary-row span,
.brand-name {
  display: block;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.auto-summary-row strong,
.scenario-card strong,
.brand-result strong {
  display: block;
  font-size: 1.05rem;
}

.machine-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 0.65rem;
}

.machine-pill {
  min-width: 6.4rem;
  padding: 0.6rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.52);
}

.machine-pill span {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
}

.machine-pill strong {
  display: block;
  margin-top: 0.12rem;
}

.machine-pill-ok {
  border-color: rgba(121, 134, 109, 0.32);
}

.machine-pill-warn {
  border-color: rgba(214, 76, 47, 0.28);
}

.hvac-chart-wrap {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 0.4rem;
  position: relative;
}

.chart-head {
  display: grid;
  gap: 0.12rem;
}

.chart-stage {
  position: relative;
}

.chart-info-button {
  position: absolute;
  top: 0.55rem;
  left: 0.5rem;
  z-index: 2;
  display: inline-grid;
  place-items: center;
  width: 1.95rem;
  height: 1.95rem;
  padding: 0;
  border: 1px solid rgba(25, 22, 19, 0.08);
  border-radius: 999px;
  background: rgba(252, 247, 240, 0.9);
  box-shadow: 0 12px 28px rgba(25, 22, 19, 0.08);
  cursor: pointer;
  transition:
    transform 140ms ease,
    background 140ms ease,
    border-color 140ms ease;
}

.chart-info-button:hover {
  background: rgba(255, 255, 255, 0.98);
  border-color: rgba(214, 76, 47, 0.18);
  transform: translateY(-1px);
}

.chart-info-button-icon {
  width: 0.92rem;
  height: 0.92rem;
}

#hvac-chart {
  width: 100%;
  height: auto;
  touch-action: none;
}

.chart-surface {
  fill: rgba(255, 255, 255, 0.52);
}

.chart-grid-line {
  stroke: rgba(25, 22, 19, 0.08);
  stroke-width: 1;
}

.chart-percentile-band {
  fill: rgba(121, 134, 109, 0.04);
}

.chart-percentile-band-extreme {
  fill: rgba(214, 76, 47, 0.06);
}

.chart-percentile-band-design {
  fill: rgba(214, 76, 47, 0.045);
}

.chart-percentile-band-winter {
  fill: rgba(178, 112, 67, 0.05);
}

.chart-percentile-band-habitual {
  fill: rgba(92, 148, 255, 0.09);
}

.chart-percentile-band-warm {
  fill: rgba(214, 76, 47, 0.08);
}

.chart-axis {
  stroke: rgba(25, 22, 19, 0.2);
  stroke-width: 1.5;
}

.chart-density-area {
  fill: rgba(121, 134, 109, 0.12);
}

.chart-density-line {
  fill: none;
  stroke: rgba(121, 134, 109, 0.72);
  stroke-width: 2;
  stroke-linecap: round;
}

.chart-path {
  fill: none;
  stroke-width: 3.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-path-base {
  stroke: var(--accent);
}

.chart-margin-band {
  fill: rgba(25, 22, 19, 0.18);
}

.chart-operational-band {
  fill: var(--system-green);
}

.chart-machine-line {
  stroke: rgba(25, 22, 19, 0.18);
  stroke-dasharray: 7 8;
}

.chart-percentile-line {
  stroke: rgba(25, 22, 19, 0.14);
  stroke-width: 1.1;
  stroke-dasharray: 3 7;
}

.chart-percentile-line-design {
  stroke: rgba(214, 76, 47, 0.32);
}

.chart-percentile-line-winter {
  stroke: rgba(150, 98, 54, 0.34);
}

.chart-percentile-line-habitual {
  stroke: rgba(121, 134, 109, 0.38);
}

.chart-machine-label,
.chart-axis-label,
.chart-legend {
  fill: var(--muted);
  font-size: 12px;
  font-family: var(--mono-font);
}

.chart-percentile-caption {
  fill: rgba(25, 22, 19, 0.5);
  font-size: 10px;
  font-family: var(--mono-font);
}

.chart-legend-base {
  fill: var(--accent);
}

.chart-legend-margin {
  fill: rgba(25, 22, 19, 0.68);
}

.chart-legend-distribution {
  fill: rgba(121, 134, 109, 0.82);
}

.chart-legend-percentiles {
  fill: rgba(25, 22, 19, 0.5);
}

.chart-point {
  fill: var(--accent);
  stroke: rgba(255, 255, 255, 0.95);
  stroke-width: 2;
}

.chart-modulation-card-surface {
  fill: rgba(252, 247, 240, 0.9);
  stroke: rgba(25, 22, 19, 0.08);
  stroke-width: 1;
}

.chart-modulation-card-title,
.chart-modulation-card-subtitle,
.chart-modulation-card-row-label,
.chart-modulation-card-row-value {
  font-family: var(--mono-font);
}

.chart-modulation-card-title {
  fill: var(--ink);
  font-size: 7.8px;
}

.chart-modulation-card-subtitle {
  fill: rgba(25, 22, 19, 0.62);
  font-size: 7.4px;
}

.chart-modulation-card-line {
  stroke: rgba(25, 22, 19, 0.58);
  stroke-width: 1.4;
  stroke-dasharray: 4 4;
  stroke-linecap: round;
}

.chart-modulation-card-row-label {
  fill: var(--muted);
  font-size: 7.4px;
}

.chart-modulation-card-row-value {
  fill: var(--ink);
  font-size: 7.8px;
  font-weight: 700;
}

.chart-hover-state {
  opacity: 0;
  transition: opacity 140ms ease;
}

.chart-hover-state.is-visible {
  opacity: 1;
}

.chart-hover-line {
  stroke: rgba(25, 22, 19, 0.22);
  stroke-width: 1.2;
  stroke-dasharray: 5 6;
}

.chart-hover-dot {
  fill: rgba(25, 22, 19, 0.85);
  stroke: rgba(255, 255, 255, 0.96);
  stroke-width: 2;
}

.chart-hover-dot-system {
  fill: rgba(124, 210, 94, 0.92);
}

.chart-hover-dot-low {
  fill: rgba(121, 134, 109, 0.82);
}

.chart-hover-dot-high {
  fill: var(--accent);
}

.chart-hover-dot-margin {
  fill: rgba(25, 22, 19, 0.78);
}

.chart-tooltip {
  position: absolute;
  z-index: 3;
  min-width: 15rem;
  padding: 0.8rem 0.95rem;
  border-radius: 1rem;
  border: 1px solid rgba(25, 22, 19, 0.08);
  background: rgba(252, 247, 240, 0.96);
  box-shadow: 0 18px 36px rgba(25, 22, 19, 0.12);
  backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease;
}

.chart-tooltip.is-visible {
  opacity: 1;
}

.chart-tooltip-head {
  margin-bottom: 0.55rem;
  font-family: var(--mono-font);
  font-size: 0.84rem;
  font-weight: 700;
}

.chart-tooltip-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  color: var(--muted);
}

.chart-tooltip-row + .chart-tooltip-row {
  margin-top: 0.28rem;
}

.chart-tooltip-series {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.chart-tooltip-row strong {
  color: var(--ink);
}

.chart-tooltip-swatch {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 999px;
  flex: 0 0 auto;
}

.chart-tooltip-swatch-system {
  background: rgba(124, 210, 94, 0.92);
}

.chart-tooltip-swatch-margin {
  background: rgba(25, 22, 19, 0.76);
}

.chart-tooltip-swatch-high {
  background: var(--accent);
}

.chart-tooltip-swatch-low {
  background: rgba(121, 134, 109, 0.82);
}

.info-modal {
  width: min(56rem, calc(100vw - 2rem));
  max-height: min(88vh, 56rem);
  padding: 0;
  border: none;
  border-radius: 1.3rem;
  background: rgba(255, 250, 244, 0.98);
  box-shadow: 0 30px 90px rgba(25, 22, 19, 0.18);
}

.info-modal::backdrop {
  background: rgba(25, 22, 19, 0.36);
  backdrop-filter: blur(10px);
}

.info-modal-frame {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.info-modal-close {
  justify-self: end;
  min-height: 2.15rem;
  padding: 0.45rem 0.82rem;
  border-radius: 999px;
  border: 1px solid rgba(25, 22, 19, 0.12);
  background: rgba(255, 255, 255, 0.9);
  cursor: pointer;
}

.info-modal-copy {
  overflow: auto;
  display: grid;
  gap: 1rem;
  padding-right: 0.3rem;
}

.info-modal-copy h2,
.info-modal-copy h3 {
  margin: 0;
}

.info-modal-copy h2 {
  font-family: var(--display-font);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
}

.info-modal-copy h3 {
  font-size: 1rem;
}

.info-modal-copy section {
  display: grid;
  gap: 0.5rem;
}

.info-modal-copy p,
.info-modal-copy li {
  color: var(--muted);
  line-height: 1.55;
}

.info-modal-copy ul {
  margin: 0;
  padding-left: 1.2rem;
}

.info-modal-formula {
  padding: 0.75rem 0.9rem;
  border-radius: 0.85rem;
  background: rgba(25, 22, 19, 0.05);
  color: var(--ink);
  font-family: var(--mono-font);
}

@media (max-width: 1120px) {
  .standalone-hvac-workbench {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .masthead,
  .calculator-main {
    padding-inline: 1rem;
  }

  .masthead {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-head h1 {
    max-width: 100%;
  }

  .panel-actions {
    width: 100%;
  }

  .panel-reset-button,
  .panel-action-button {
    flex: 1 1 10rem;
    justify-content: center;
  }

  .control-input-row {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .control-value {
    min-width: 0;
    text-align: left;
  }
}