:root {
  /* surfaces + text */
  --color-bg: #f2f5f8;
  --color-surface: #ffffff;
  --color-text: #14202b;
  --color-text-soft: #46535f;
  --color-line: #d3dbe3;
  --color-line-strong: #9aa7b4;
  --color-on-accent: #ffffff;
  --color-shadow: rgba(20, 32, 43, 0.08);
  --color-overlay: rgba(242, 245, 248, 0.92);
  /* encoding colors: blue = cooling, rust = heating, slate = airflow/controls */
  --color-primary: #1d5ba3;
  --color-primary-dark: #154680;
  --color-primary-tint: #dce7f4;
  --color-secondary: #a8501a;
  --color-secondary-tint: #f5e2d4;
  --color-accent: #3d4c5a;
  --color-accent-tint: #e2e7ec;
  --color-focus: #f0b429;

  --font-display: "Avenir Next Condensed", "Avenir Next", "Helvetica Neue", "Arial Narrow", Arial, sans-serif;
  --font-body: "Avenir Next", "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --wrap: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}
h1, h2, h3 { font-family: var(--font-display); line-height: 1.05; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.5rem, 6.4vw, 4.6rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); font-weight: 700; }
h3 { font-size: 1.3rem; font-weight: 600; }
p { margin: 0; }

.wrap { width: min(var(--wrap), 100% - 40px); margin-inline: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* heading + its line: one tight unit */
.head { margin-bottom: 32px; max-width: 46rem; }
.head p { margin-top: 12px; color: var(--color-text-soft); font-size: 1.08rem; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--color-overlay);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 20px;
  min-height: 68px;
}
.hdr-phone {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 44px; padding: 0 16px;
  border-radius: var(--r-sm);
  background: var(--color-primary); color: var(--color-on-accent);
  font-weight: 700; text-decoration: none; white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.hdr-phone:hover { background: var(--color-primary-dark); }
.hdr-phone small { font-weight: 500; opacity: 0.85; font-size: 0.85em; }
.wordmark {
  font-family: var(--font-display); font-weight: 700; font-size: 1.2rem;
  color: var(--color-text); text-decoration: none; line-height: 1.1;
  display: inline-flex; align-items: center; gap: 0.3em; min-height: 44px;
}
.wordmark span { color: var(--color-text-soft); font-weight: 500; }
.nav { margin-left: auto; display: flex; gap: 4px; }
.nav a {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 14px;
  border-radius: var(--r-sm);
  color: var(--color-text); text-decoration: none; font-weight: 600;
}
.nav a:hover { background: var(--color-accent-tint); }
.nav a[aria-current="page"] { background: var(--color-surface); box-shadow: inset 0 0 0 1px var(--color-line); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 22px;
  border-radius: var(--r-sm);
  font-weight: 700; text-decoration: none; font-size: 1rem;
  border: 0; cursor: pointer; font-family: inherit;
}
.btn-primary { background: var(--color-primary); color: var(--color-on-accent); }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-ghost { color: var(--color-text); box-shadow: inset 0 0 0 1.5px var(--color-line-strong); background: transparent; }
.btn-ghost:hover { background: var(--color-surface); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* ---------- hero ---------- */
.hero { padding: 56px 0 56px; }
.hero .wrap {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center;
}
.hero-copy h1 em { font-style: normal; color: var(--color-primary); }
.hero-copy .lede { margin-top: 18px; font-size: 1.2rem; color: var(--color-text-soft); max-width: 34rem; }
.hero-facts {
  margin: 32px 0 0; padding: 0; list-style: none;
  display: grid; gap: 10px; color: var(--color-text-soft);
}
.hero-facts li { display: flex; gap: 10px; }
.hero-facts strong { color: var(--color-text); min-width: 5.5rem; }

.photo { margin: 0; }
.photo img {
  width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: 40% 55%;
  border-radius: var(--r-lg);
  box-shadow: 0 20px 50px var(--color-shadow);
}
.photo figcaption { margin-top: 10px; font-size: 0.92rem; color: var(--color-text-soft); line-height: 1.4; }
.photo .stock-label { display: block; margin-top: 4px; font-size: 0.78rem; color: var(--color-text-soft); }

/* ---------- sections ---------- */
.section { padding: 56px 0; }
.section-alt { background: var(--color-surface); border-block: 1px solid var(--color-line); }

/* about */
.about .wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: start; }
.about .head { margin-bottom: 0; }
.about-body p + p { margin-top: 16px; }
.about-body p { color: var(--color-text-soft); }
.about-card {
  background: var(--color-bg); border-radius: var(--r-md); padding: 24px;
  margin-top: 24px; border: 1px solid var(--color-line);
}
.about-card dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 10px 20px; }
.about-card dt { font-weight: 700; }
.about-card dd { margin: 0; color: var(--color-text-soft); }

/* symptom index (home preview + services page) */
.key {
  display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 0 0 24px; padding: 0; list-style: none;
  font-size: 0.95rem; color: var(--color-text-soft);
}
.key li { display: inline-flex; align-items: center; gap: 8px; }
.key i { width: 14px; height: 14px; border-radius: 4px; display: inline-block; }
.cool { --tone: var(--color-primary); --tone-tint: var(--color-primary-tint); }
.heat { --tone: var(--color-secondary); --tone-tint: var(--color-secondary-tint); }
.air  { --tone: var(--color-accent); --tone-tint: var(--color-accent-tint); }
.key i { background: var(--tone); }

.symptoms { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.symptom {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 8px 32px;
  padding: 18px 22px 18px 24px;
  background: var(--color-surface);
  border-radius: var(--r-md);
  border: 1px solid var(--color-line);
  border-left: 6px solid var(--tone);
}
.section-alt .symptom { background: var(--color-bg); }
.symptom h3 { font-size: 1.15rem; line-height: 1.25; }
.symptom p { color: var(--color-text-soft); }
.symptom .tag {
  display: block; width: fit-content; margin-top: 8px; padding: 2px 10px; border-radius: 999px;
  background: var(--tone-tint); color: var(--color-text); font-size: 0.8rem; font-weight: 600;
}
.more { margin-top: 24px; }

/* ---------- climate chart (signature) ---------- */
.climate .wrap { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 48px; align-items: center; }
.climate-copy p { color: var(--color-text-soft); }
.climate-copy p + p { margin-top: 14px; }
.chart {
  background: var(--color-surface); border-radius: var(--r-lg); padding: 24px 20px 16px 48px;
  border: 1px solid var(--color-line);
}
.plot { position: relative; height: 260px; }
.gridline {
  position: absolute; left: 0; right: 0; height: 0;
  bottom: calc((var(--t) - 30) / 65 * 100%);
  border-top: 1px solid var(--color-line);
}
.gridline span {
  position: absolute; right: calc(100% + 8px); top: -0.7em;
  font-size: 0.75rem; color: var(--color-text-soft); font-variant-numeric: tabular-nums;
}
.gridline.base { border-top: 2px dashed var(--color-line-strong); }
.gridline.base span { color: var(--color-text); font-weight: 700; }
.bars {
  position: absolute; inset: 0; display: grid; grid-template-columns: repeat(12, 1fr); gap: 6px;
}
.bar { position: relative; }
.bar b {
  position: absolute; left: 18%; right: 18%;
  bottom: calc((var(--lo) - 30) / 65 * 100%);
  height: calc((var(--hi) - var(--lo)) / 65 * 100%);
  --split: calc((65 - var(--lo)) / (var(--hi) - var(--lo)) * 100%);
  background: linear-gradient(to top, var(--color-secondary) 0, var(--color-secondary) var(--split), var(--color-primary) var(--split), var(--color-primary) 100%);
  border-radius: 6px;
}
.bar .v {
  position: absolute; left: 0; right: 0; text-align: center;
  font-size: 0.72rem; font-variant-numeric: tabular-nums; color: var(--color-text-soft);
  bottom: calc((var(--hi) - 30) / 65 * 100% + 4px);
}
.months {
  display: grid; grid-template-columns: repeat(12, 1fr); gap: 6px; margin-top: 8px;
  font-size: 0.75rem; color: var(--color-text-soft); text-align: center;
}
.chart .source { margin-top: 12px; font-size: 0.78rem; color: var(--color-text-soft); line-height: 1.4; }

/* ---------- close band ---------- */
.close {
  padding: 56px 0;
}
.close-panel {
  background: var(--color-primary); color: var(--color-on-accent);
  border-radius: var(--r-lg); padding: 44px 48px;
  display: grid; grid-template-columns: 1fr auto; gap: 24px 48px; align-items: center;
}
.close-panel h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
.close-panel p { margin-top: 10px; opacity: 0.92; }
.close-phone {
  display: inline-flex; align-items: center; min-height: 56px; padding: 0 26px;
  border-radius: var(--r-md);
  background: var(--color-surface); color: var(--color-primary-dark);
  font-family: var(--font-display); font-weight: 700; font-size: clamp(1.4rem, 3vw, 1.9rem);
  text-decoration: none; font-variant-numeric: tabular-nums; white-space: nowrap;
}
.close-phone:hover { background: var(--color-primary-tint); }

/* ---------- page header (inner pages) ---------- */
.page-head { padding: 56px 0 8px; }
.page-head p { margin-top: 14px; color: var(--color-text-soft); font-size: 1.15rem; max-width: 40rem; }

.group + .group { margin-top: 44px; }
.group-title { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.group-title i { width: 18px; height: 18px; border-radius: 5px; background: var(--tone); display: inline-block; }
.group-title + p { margin: -8px 0 18px; color: var(--color-text-soft); }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; align-items: start; }
.contact-info {
  background: var(--color-surface); border-radius: var(--r-lg); padding: 28px;
  border: 1px solid var(--color-line);
}
.contact-info h2 { font-size: 1.6rem; }
.contact-info .big-phone {
  display: inline-flex; align-items: center; min-height: 52px; margin-top: 12px;
  font-family: var(--font-display); font-size: 2rem; font-weight: 700;
  color: var(--color-primary); text-decoration: none; font-variant-numeric: tabular-nums;
}
.contact-info address { font-style: normal; margin-top: 18px; color: var(--color-text-soft); }
.contact-info address strong { display: block; color: var(--color-text); }
.ready { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--color-line); }
.ready h3 { font-size: 1.1rem; }
.ready ul { margin: 10px 0 0; padding-left: 1.1rem; color: var(--color-text-soft); }
.ready li + li { margin-top: 6px; }

form.contact-form { display: grid; gap: 16px; }
.field { display: grid; gap: 6px; }
.field label { font-weight: 600; font-size: 0.95rem; }
.field input, .field textarea, .field select {
  font: inherit; color: var(--color-text);
  background: var(--color-surface);
  border: 1.5px solid var(--color-line-strong);
  border-radius: var(--r-sm);
  min-height: 48px; padding: 10px 14px;
}
.field textarea { min-height: 130px; resize: vertical; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-note { font-size: 0.85rem; color: var(--color-text-soft); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 28px 0 32px; font-size: 0.92rem; color: var(--color-text-soft);
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 32px; align-items: center; justify-content: space-between; }
.site-footer a { color: var(--color-text); display: inline-flex; align-items: center; min-height: 34px; }
.site-footer nav { display: flex; gap: 18px; }

/* ---------- motion ---------- */
.motion .reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.motion .reveal.in { opacity: 1; transform: none; }
.motion .reveal-side { opacity: 0; transform: translateX(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.motion .reveal-side.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .motion .reveal, .motion .reveal-side { opacity: 1; transform: none; transition: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero .wrap, .about .wrap, .climate .wrap, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .about .wrap { gap: 20px; }
  .photo { max-width: 460px; }
  .close-panel { grid-template-columns: 1fr; padding: 36px 28px; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .site-header .wrap { flex-wrap: wrap; gap: 6px 12px; padding: 10px 0 6px; }
  .wordmark { font-size: 1.05rem; }
  .nav { margin-left: 0; width: 100%; justify-content: space-between; }
  .nav a { padding: 0 12px; }
  .hero { padding: 36px 0 44px; }
  .section, .close { padding: 44px 0; }
  .page-head { padding: 40px 0 4px; }
  .symptom { grid-template-columns: 1fr; padding: 16px 16px 16px 18px; }
  .chart { padding: 20px 10px 14px 36px; }
  .plot { height: 220px; }
  .bars, .months { gap: 2px; }
  .bar b { left: 14%; right: 14%; }
  .bar .v { font-size: 0.62rem; }
  .months { font-size: 0.62rem; }
  .field-row { grid-template-columns: 1fr; }
  .close-phone { width: 100%; justify-content: center; }
}