:root {
  --color-primary: #1d5f9e;      /* cooling */
  --color-secondary: #b4430f;    /* heating */
  --color-accent: #8a96a0;       /* shoulder months (graphic only) */
  --color-bg: #f3f5f6;
  --color-text: #15212b;
  --color-text-soft: #3d4b57;
  --color-surface: #ffffff;
  --color-line: #d5dce1;
  --color-cool-tint: #e3edf7;
  --color-warm-tint: #fbe9df;
  --color-shoulder-tint: #e9edf0;
  --color-deep: #10202e;
  --color-on-deep: #f3f5f6;
  --color-on-deep-soft: #b9c6d1;
  --color-star: #b4430f;
  --color-focus: #1d5f9e;
  --color-shadow: rgba(16, 32, 46, 0.10);

  --font-display: "Avenir Next", Avenir, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --wrap: 1160px;
}

*, *::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%; display: block; }
a { color: var(--color-primary); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.1; margin: 0; letter-spacing: -0.015em; }
p { margin: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { min-height: 40px; display: inline-flex; align-items: center; left: 12px; top: 12px; background: var(--color-surface); padding: 8px 12px; border-radius: var(--radius-sm); z-index: 10; }

/* ---------- Header ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}
.header-row {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 68px;
  flex-wrap: wrap;
}
.header-phone {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-surface);
  font-weight: 700;
  text-decoration: none;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.header-phone:hover { background: var(--color-text); }
.wordmark {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}
.wordmark span { font-weight: 500; color: var(--color-text-soft); }
.site-nav { margin-left: auto; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
}
.site-nav a:hover { background: var(--color-shoulder-tint); }
.site-nav a[aria-current="page"] { background: var(--color-cool-tint); color: var(--color-primary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
}
.btn-primary { background: var(--color-primary); color: var(--color-surface); }
.btn-primary:hover { background: var(--color-text); }
.btn-ghost { border-color: var(--color-line); color: var(--color-text); background: var(--color-surface); }
.btn-ghost:hover { border-color: var(--color-text); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Hero ---------- */
.hero { padding: 64px 0 72px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { font-size: clamp(2.1rem, 3.8vw, 3.1rem); font-weight: 800; }
.hero h1 .cool { color: var(--color-primary); }
.hero h1 .warm { color: var(--color-secondary); }
.hero-sub { margin-top: 16px; font-size: 1.15rem; color: var(--color-text-soft); max-width: 34em; }
.hero .btn-row { margin-top: 28px; }
.rating-line { margin-top: 20px; color: var(--color-text-soft); font-size: 0.98rem; }
.rating-line strong { color: var(--color-text); }
.rating-line .star { color: var(--color-star); }

/* ---------- Year chart (signature) ---------- */
.year {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 24px 24px 20px;
  box-shadow: 0 10px 30px var(--color-shadow);
}
.year h2 { font-size: 1.2rem; font-weight: 700; }
.year-src { margin-top: 6px; font-size: 0.85rem; color: var(--color-text-soft); }
.chart {
  position: relative;
  margin: 28px 0 0 30px;
  height: 200px;
}
.gridline {
  position: absolute;
  left: 0; right: 0;
  border-top: 1px dashed var(--color-line);
  bottom: calc((var(--t) - 30) / 65 * 100%);
}
.gridline span {
  position: absolute;
  right: 100%;
  margin-right: 6px;
  transform: translateY(-50%);
  font-size: 0.75rem;
  color: var(--color-text-soft);
  font-variant-numeric: tabular-nums;
}
.months {
  list-style: none;
  margin: 0; padding: 0;
  position: absolute; inset: 0;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 6px;
}
.months li { position: relative; }
.bar {
  position: absolute;
  left: 18%; right: 18%;
  bottom: calc((var(--lo) - 30) / 65 * 100%);
  height: calc((var(--hi) - var(--lo)) / 65 * 100%);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}
.months li[data-mode="cool"] .bar { background: var(--color-primary); }
.months li[data-mode="heat"] .bar { background: var(--color-secondary); }
.bar .hi, .bar .lo {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}
.bar .hi { bottom: 100%; margin-bottom: 3px; }
.bar .lo { top: 100%; margin-top: 3px; color: var(--color-text-soft); font-weight: 500; }
.mon {
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  margin-top: 26px;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-soft);
}
.months li.is-now .mon {
  color: var(--color-surface);
  background: var(--color-text);
  border-radius: var(--radius-pill);
}
.legend {
  list-style: none;
  margin: 58px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.85rem;
  color: var(--color-text-soft);
}
.legend li { display: flex; align-items: center; gap: 8px; }
.swatch { width: 12px; height: 12px; border-radius: 4px; background: var(--color-accent); flex: none; }
.swatch.cool { background: var(--color-primary); }
.swatch.heat { background: var(--color-secondary); }
.now-note {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--color-shoulder-tint);
  font-size: 0.95rem;
}
.now-note[hidden] { display: none; }

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section-head { max-width: 40em; margin-bottom: 36px; }
.section-head h2 { font-size: clamp(1.8rem, 3.2vw, 2.5rem); font-weight: 800; }
.section-head p { margin-top: 12px; color: var(--color-text-soft); font-size: 1.08rem; }

/* About */
.about { background: var(--color-surface); }
.about-grid { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 56px; align-items: start; }
.photo img { border-radius: var(--radius-md); width: 100%; height: auto; }
.photo figcaption { margin-top: 10px; font-size: 0.88rem; color: var(--color-text); }
.photo .stock-label { display: block; margin-top: 2px; font-size: 0.78rem; color: var(--color-text-soft); }
.about-copy h2 { font-size: clamp(1.8rem, 3.2vw, 2.5rem); font-weight: 800; }
.about-copy h2 + p { margin-top: 14px; }
.about-copy p + p { margin-top: 14px; }
.about-copy p { color: var(--color-text-soft); }
.facts {
  margin: 28px 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  border-top: 1px solid var(--color-line);
}
.facts dt, .facts dd { padding: 12px 0; border-bottom: 1px solid var(--color-line); margin: 0; }
.facts dt { font-weight: 700; padding-right: 24px; }
.facts dd a, .svc-note a { font-weight: 600; display: inline-flex; align-items: center; min-height: 34px; vertical-align: middle; }
.facts dd:has(a) { padding: 7px 0; }

/* Phases (widths = month counts) */
.phases { display: flex; gap: 10px; }
.phase {
  flex: var(--months) 1 0;
  min-width: 0;
  border-radius: var(--radius-md);
  padding: 22px 20px;
  background: var(--color-shoulder-tint);
  border: 2px solid transparent;
}
.phase[data-mode="cool"] { background: var(--color-cool-tint); }
.phase[data-mode="heat"] { background: var(--color-warm-tint); }
.phase.is-now { border-color: var(--color-text); }
.phase-months { font-size: 0.9rem; font-weight: 700; color: var(--color-text-soft); font-variant-numeric: tabular-nums; }
.phase[data-mode="cool"] .phase-months { color: var(--color-primary); }
.phase[data-mode="heat"] .phase-months { color: var(--color-secondary); }
.phase h3 { margin-top: 6px; font-size: 1.25rem; font-weight: 700; }
.phase p { margin-top: 8px; font-size: 0.97rem; color: var(--color-text-soft); }
.phase .now-tag {
  display: none;
  margin-top: 12px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-surface);
  background: var(--color-text);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  width: max-content;
}
.phase.is-now .now-tag { display: block; }
.phases-foot { margin-top: 24px; }

/* Rating band */
.rating-band { padding: 0 0 88px; }
.rating-box {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
}
.rating-num { font-family: var(--font-display); font-size: 3.4rem; font-weight: 800; line-height: 1; }
.rating-num .star { color: var(--color-star); font-size: 0.6em; vertical-align: 0.35em; margin-left: 4px; }
.rating-copy h2 { font-size: 1.3rem; font-weight: 700; }
.rating-copy p { margin-top: 6px; color: var(--color-text-soft); }
.rating-box .btn { margin-left: auto; }

/* Close band */
.close-band { background: var(--color-deep); color: var(--color-on-deep); padding: 72px 0; }
.close-grid { display: flex; align-items: end; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.close-band h2 { font-size: clamp(1.8rem, 3.6vw, 2.8rem); font-weight: 800; }
.close-band h2 + p { margin-top: 12px; color: var(--color-on-deep-soft); }
.close-phone {
  display: inline-flex;
  align-items: center;
  min-height: 56px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  background: var(--color-on-deep);
  color: var(--color-deep);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  text-decoration: none;
  font-variant-numeric: tabular-nums;
}
.close-phone:hover { background: var(--color-cool-tint); }

/* Footer */
.site-footer { background: var(--color-deep); color: var(--color-on-deep-soft); border-top: 1px solid var(--color-text-soft); padding: 28px 0 36px; font-size: 0.92rem; }
.footer-row { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between; }
.site-footer a { color: var(--color-on-deep); display: inline-flex; align-items: center; min-height: 36px; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- Page intro (inner pages) ---------- */
.page-intro { padding: 56px 0 40px; }
.page-intro h1 { font-size: clamp(2.1rem, 4.4vw, 3.2rem); font-weight: 800; }
.page-intro h1 + p { margin-top: 12px; font-size: 1.12rem; color: var(--color-text-soft); max-width: 38em; }

/* Services */
.svc-list { display: grid; gap: 18px; padding-bottom: 88px; }
.svc {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border-left: 8px solid var(--color-accent);
}
.svc[data-mode="cool"] { border-left-color: var(--color-primary); }
.svc[data-mode="heat"] { border-left-color: var(--color-secondary); }
.svc-when { font-size: 0.92rem; font-weight: 700; color: var(--color-text-soft); }
.svc h2 { font-size: 1.6rem; font-weight: 800; }
.svc h2 + .svc-when { margin-top: 8px; }
.svc-body > p { color: var(--color-text-soft); }
.svc-body h3 { margin-top: 20px; font-size: 1rem; font-weight: 700; }
.svc-body ul { margin: 8px 0 0; padding-left: 1.2em; color: var(--color-text-soft); }
.svc-body li + li { margin-top: 4px; }
.svc-with-photo { grid-template-columns: 220px 1fr 260px; }
.svc-with-photo .photo img { aspect-ratio: 3 / 4; object-fit: cover; }
.svc-note {
  padding: 24px 28px;
  border-radius: var(--radius-md);
  background: var(--color-cool-tint);
}
.svc-note p { color: var(--color-text); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding-bottom: 88px; align-items: start; }
.panel {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-line);
}
.panel h2 { font-size: 1.5rem; font-weight: 800; }
.panel h2 + p { margin-top: 10px; color: var(--color-text-soft); }
.big-phone {
  display: inline-flex;
  align-items: center;
  min-height: 60px;
  margin-top: 20px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-surface);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  font-variant-numeric: tabular-nums;
}
.big-phone:hover { background: var(--color-text); }
.panel .facts { margin-top: 28px; }
.steps { list-style: none; margin: 20px 0 0; padding: 0; counter-reset: step; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 18px 48px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 32px; height: 32px;
  border-radius: 10px;
  background: var(--color-cool-tint);
  color: var(--color-primary);
  font-weight: 800;
  display: grid;
  place-items: center;
}
.steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 15px; top: 36px; bottom: 4px;
  border-left: 2px solid var(--color-line);
}
.steps strong { display: block; }
.steps span { display: block; margin-top: 2px; color: var(--color-text-soft); font-size: 0.96rem; }

/* ---------- Motion ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.js [data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .phases { flex-direction: column; }
  .phase { flex: none; }
  .phase::before {
    content: "";
    display: block;
    height: 6px;
    width: calc(var(--months) / 5 * 100%);
    margin-bottom: 14px;
    border-radius: var(--radius-pill);
    background: var(--color-accent);
  }
  .phase[data-mode="cool"]::before { background: var(--color-primary); }
  .phase[data-mode="heat"]::before { background: var(--color-secondary); }
  .svc, .svc-with-photo { grid-template-columns: 1fr; gap: 16px; }
  .svc-with-photo .photo { max-width: 320px; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .header-row { gap: 8px 12px; padding: 10px 0; }
  .site-nav { margin-left: 0; width: 100%; }
  .site-nav ul { justify-content: space-between; }
  .site-nav a { padding: 0 12px; }
  .hero { padding: 40px 0 56px; }
  .section { padding: 64px 0; }
  .rating-band { padding-bottom: 64px; }
  .year { padding: 20px 14px 16px; }
  .chart { margin-left: 26px; height: 180px; }
  .months { gap: 3px; }
  .bar { left: 14%; right: 14%; }
  .bar .hi, .bar .lo { font-size: 0.66rem; }
  .mon { font-size: 0.7rem; }
  .rating-box { padding: 24px; }
  .rating-box .btn { margin-left: 0; }
  .svc, .panel { padding: 24px 20px; }
  .big-phone, .close-phone { font-size: 1.25rem; padding: 0 22px; }
  .svc-list, .contact-grid { padding-bottom: 64px; }
}