:root {
  --hvac-navy: #082f4d;
  --hvac-navy-deep: #05243b;
  --hvac-blue: #1478b8;
  --hvac-blue-soft: #eaf6fd;
  --hvac-orange: #f4512c;
  --hvac-orange-dark: #d83c1d;
  --hvac-ink: #0a2034;
  --hvac-muted: #526578;
  --hvac-line: #d9e6ee;
  --hvac-surface: #f6fafc;
  --hvac-shadow: 0 22px 60px rgba(8, 47, 77, 0.12);
}

html { scroll-behavior: smooth; }

body.hvac-page {
  background: #fff;
  color: var(--hvac-ink);
}

.hvac-page .site-header {
  background: var(--hvac-navy);
  box-shadow: 0 8px 30px rgba(5, 36, 59, 0.15);
}

.hvac-page .nav-link { color: rgba(255,255,255,.92); }
.hvac-page .nav-link:hover,
.hvac-page .nav-link.active { color: #fff; }
.hvac-page .nav-link.active::after { background: var(--hvac-orange); }

.hvac-page .btn-primary,
.hvac-primary-btn {
  align-items: center;
  background: var(--hvac-orange);
  border: 1px solid var(--hvac-orange);
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(244, 81, 44, .24);
  color: #fff;
  display: inline-flex;
  font-weight: 700;
  gap: 12px;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  text-decoration: none;
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.hvac-page .btn-primary:hover,
.hvac-primary-btn:hover {
  background: var(--hvac-orange-dark);
  box-shadow: 0 14px 30px rgba(244, 81, 44, .32);
  color: #fff;
  transform: translateY(-2px);
}

.hvac-secondary-btn {
  align-items: center;
  background: #fff;
  border: 1px solid rgba(8, 47, 77, .3);
  border-radius: 12px;
  color: var(--hvac-navy);
  display: inline-flex;
  font-weight: 700;
  gap: 10px;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  text-decoration: none;
}

.hvac-hero {
  background: #fbfdfe;
  min-height: 650px;
  overflow: hidden;
  padding-top: 86px;
  position: relative;
}

.hvac-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1.18fr);
  min-height: 600px;
}

.hvac-hero-copy {
  align-items: flex-start;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 58px 20px 58px max(32px, calc((100vw - 1200px) / 2));
  position: relative;
  z-index: 2;
}

.hvac-eyebrow,
.hvac-section-kicker {
  align-items: center;
  color: var(--hvac-blue);
  display: inline-flex;
  font-size: .76rem;
  font-weight: 800;
  gap: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.hvac-eyebrow::before,
.hvac-section-kicker::before {
  background: var(--hvac-orange);
  content: '';
  height: 3px;
  width: 34px;
}

.hvac-hero h1 {
  color: var(--hvac-navy-deep);
  font-size: clamp(2.55rem, 4vw, 4.3rem);
  font-weight: 800;
  letter-spacing: -.045em;
  line-height: 1.02;
  margin: 22px 0;
  max-width: 680px;
}

.hvac-hero h1 strong { color: var(--hvac-orange); }

.hvac-hero-lead {
  color: #304b61;
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  line-height: 1.65;
  margin: 0 0 28px;
  max-width: 640px;
}

.hvac-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hvac-trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 34px;
}

.hvac-trust-item {
  align-items: center;
  color: #29475f;
  display: flex;
  font-size: .78rem;
  font-weight: 600;
  gap: 10px;
  max-width: 152px;
}

.hvac-trust-item i {
  color: var(--hvac-blue);
  font-size: 1.25rem;
}

.hvac-hero-media {
  min-height: 600px;
  overflow: hidden;
  position: relative;
}

.hvac-hero-media img {
  height: 100%;
  object-fit: cover;
  object-position: 62% center;
  width: 100%;
}

.hvac-estimator-wrap {
  margin: -46px auto 0;
  max-width: 1280px;
  padding: 0 24px;
  position: relative;
  z-index: 3;
}

.hvac-estimator {
  background: #f5fbff;
  border: 1px solid #d5e8f3;
  border-radius: 22px;
  box-shadow: var(--hvac-shadow);
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 2.1fr) minmax(280px, .9fr);
  padding: 30px 34px;
}

.hvac-estimator h2 {
  color: var(--hvac-navy-deep);
  font-size: clamp(1.7rem, 2.4vw, 2.25rem);
  letter-spacing: -.025em;
  margin: 7px 0 4px;
}

.hvac-estimator-intro { color: var(--hvac-muted); margin: 0 0 20px; }

.hvac-estimator-fields {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(5, minmax(115px, 1fr));
}

.hvac-field label {
  color: #254760;
  display: block;
  font-size: .78rem;
  font-weight: 700;
  margin-bottom: 7px;
}

.hvac-field input,
.hvac-field select {
  background: #fff;
  border: 1px solid #bcd2e0;
  border-radius: 10px;
  color: var(--hvac-ink);
  font: inherit;
  height: 48px;
  padding: 0 13px;
  width: 100%;
}

.hvac-field input:focus,
.hvac-field select:focus {
  border-color: var(--hvac-blue);
  box-shadow: 0 0 0 3px rgba(20,120,184,.15);
  outline: none;
}

.hvac-estimator-note {
  align-items: flex-start;
  color: #4f687b;
  display: flex;
  font-size: .79rem;
  gap: 9px;
  line-height: 1.45;
  margin: 16px 0 0;
}

.hvac-estimator-note i { color: var(--hvac-blue); margin-top: 2px; }

.hvac-estimator-result {
  align-items: flex-start;
  border-left: 1px solid #c7dce9;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-left: 30px;
}

.hvac-result-label {
  color: var(--hvac-blue);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .17em;
  text-transform: uppercase;
}

.hvac-result-price {
  color: var(--hvac-orange);
  font-size: clamp(1.85rem, 2.8vw, 2.65rem);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.05;
  margin: 7px 0;
}

.hvac-result-capacity {
  color: var(--hvac-navy);
  font-weight: 700;
  margin-bottom: 17px;
}

.hvac-section {
  padding: 92px 0;
}

.hvac-section--soft { background: var(--hvac-surface); }

.hvac-section-head {
  align-items: end;
  display: flex;
  justify-content: space-between;
  margin-bottom: 36px;
}

.hvac-section-head h2 {
  color: var(--hvac-navy-deep);
  font-size: clamp(2rem, 3.4vw, 3.2rem);
  letter-spacing: -.035em;
  line-height: 1.08;
  margin: 10px 0 0;
  max-width: 850px;
}

.hvac-section-head p {
  color: var(--hvac-muted);
  line-height: 1.7;
  margin: 0;
  max-width: 440px;
}

.hvac-feature-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, 1fr);
}

.hvac-feature-card {
  background: var(--hvac-navy);
  border-radius: 18px;
  color: #fff;
  min-height: 330px;
  overflow: hidden;
  position: relative;
}

.hvac-feature-card img {
  height: 100%;
  inset: 0;
  object-fit: cover;
  position: absolute;
  transition: transform .5s ease;
  width: 100%;
}

.hvac-feature-card:hover img { transform: scale(1.035); }

.hvac-feature-content {
  background: rgba(5,36,59,.88);
  bottom: 0;
  left: 0;
  padding: 28px;
  position: absolute;
  right: 0;
  z-index: 2;
}

.hvac-feature-content h3 { color: #fff; font-size: 1.55rem; margin: 0 0 8px; }
.hvac-feature-content p { color: rgba(255,255,255,.86); line-height: 1.55; margin: 0; }
.hvac-feature-link { color: #fff; display: inline-flex; font-weight: 700; gap: 8px; margin-top: 15px; text-decoration: none; }

.hvac-services-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, 1fr);
}

.hvac-service-card {
  background: #fff;
  border: 1px solid var(--hvac-line);
  border-radius: 18px;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}

.hvac-service-card:hover { box-shadow: var(--hvac-shadow); transform: translateY(-5px); }
.hvac-service-card img { aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }
.hvac-service-card-body { padding: 24px; }
.hvac-service-card h3 { color: var(--hvac-navy); font-size: 1.25rem; margin: 0 0 9px; }
.hvac-service-card p { color: var(--hvac-muted); line-height: 1.62; margin: 0 0 15px; }
.hvac-service-card ul { color: #355166; display: grid; gap: 8px; list-style: none; margin: 0; padding: 0; }
.hvac-service-card li { font-size: .9rem; padding-left: 21px; position: relative; }
.hvac-service-card li::before { color: var(--hvac-orange); content: '\f058'; font-family: 'Font Awesome 6 Free'; font-weight: 900; left: 0; position: absolute; }

.hvac-method {
  display: grid;
  gap: 34px;
  grid-template-columns: .8fr 2.2fr;
}

.hvac-method-intro h2 { color: var(--hvac-navy); font-size: 2.5rem; letter-spacing: -.035em; line-height: 1.12; margin: 12px 0; }
.hvac-method-intro p { color: var(--hvac-muted); line-height: 1.7; }
.hvac-method-steps { display: grid; gap: 18px; grid-template-columns: repeat(4, 1fr); }
.hvac-step { border-top: 2px solid #d6e4ed; padding-top: 22px; }
.hvac-step-number { align-items: center; background: var(--hvac-blue-soft); border-radius: 50%; color: var(--hvac-blue); display: flex; font-weight: 800; height: 42px; justify-content: center; margin-bottom: 16px; width: 42px; }
.hvac-step h3 { color: var(--hvac-navy); font-size: 1.05rem; margin: 0 0 7px; }
.hvac-step p { color: var(--hvac-muted); font-size: .88rem; line-height: 1.55; margin: 0; }

.hvac-materials-panel {
  background: var(--hvac-navy-deep);
  border-radius: 24px;
  color: #fff;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}

.hvac-materials-media img { height: 100%; object-fit: cover; width: 100%; }
.hvac-materials-copy { padding: 52px; }
.hvac-materials-copy h2 { color: #fff; font-size: clamp(2rem, 3vw, 3rem); letter-spacing: -.035em; line-height: 1.08; margin: 12px 0 18px; }
.hvac-materials-copy p { color: rgba(255,255,255,.82); line-height: 1.7; }
.hvac-materials-list { display: grid; gap: 13px; list-style: none; margin: 24px 0 0; padding: 0; }
.hvac-materials-list li { align-items: flex-start; display: flex; gap: 12px; }
.hvac-materials-list i { color: #ff9b7f; margin-top: 5px; }

.hvac-faq { max-width: 900px; }
.hvac-faq details { border-bottom: 1px solid var(--hvac-line); padding: 20px 0; }
.hvac-faq summary { color: var(--hvac-navy); cursor: pointer; font-size: 1.05rem; font-weight: 700; list-style: none; padding-right: 34px; position: relative; }
.hvac-faq summary::-webkit-details-marker { display: none; }
.hvac-faq summary::after { color: var(--hvac-orange); content: '+'; font-size: 1.55rem; position: absolute; right: 4px; top: -5px; }
.hvac-faq details[open] summary::after { content: '−'; }
.hvac-faq p { color: var(--hvac-muted); line-height: 1.7; margin: 14px 0 0; }

.hvac-cta {
  background: var(--hvac-navy-deep);
  color: #fff;
  padding: 74px 0;
}
.hvac-cta-grid { align-items: center; display: grid; gap: 40px; grid-template-columns: 1.4fr .6fr; }
.hvac-cta h2 { color: #fff; font-size: clamp(2.1rem, 4vw, 3.75rem); letter-spacing: -.04em; line-height: 1.05; margin: 0 0 14px; }
.hvac-cta p { color: rgba(255,255,255,.82); font-size: 1.08rem; line-height: 1.65; margin: 0; max-width: 740px; }
.hvac-cta-actions { display: grid; gap: 12px; }
.hvac-cta-actions a { width: 100%; }

.hvac-article-hero {
  background: var(--hvac-navy-deep);
  color: #fff;
  padding: 150px 0 70px;
}
.hvac-article-hero .breadcrumb a,
.hvac-article-hero .breadcrumb { color: rgba(255,255,255,.75); }
.hvac-article-hero h1 { color: #fff; font-size: clamp(2.35rem, 5vw, 4.5rem); letter-spacing: -.04em; line-height: 1.06; margin: 28px 0 20px; max-width: 1000px; }
.hvac-article-deck { color: rgba(255,255,255,.82); font-size: 1.2rem; line-height: 1.7; max-width: 820px; }
.hvac-article-meta { color: #aed9f3; display: flex; flex-wrap: wrap; gap: 18px; margin-top: 24px; }
.hvac-article-cover { border-radius: 22px; box-shadow: var(--hvac-shadow); display: block; margin: -34px auto 0; max-height: 620px; max-width: 1160px; object-fit: cover; width: calc(100% - 48px); }
.hvac-article-layout { display: grid; gap: 52px; grid-template-columns: minmax(0, 1fr) 300px; margin: 70px auto; max-width: 1120px; padding: 0 24px; }
.hvac-article-content { color: #263f52; font-size: 1.02rem; line-height: 1.82; }
.hvac-article-content h2 { color: var(--hvac-navy); font-size: 2rem; letter-spacing: -.025em; line-height: 1.2; margin: 44px 0 16px; }
.hvac-article-content h3 { color: var(--hvac-navy); font-size: 1.35rem; margin: 30px 0 12px; }
.hvac-article-content table { border-collapse: collapse; display: block; margin: 24px 0; overflow-x: auto; width: 100%; }
.hvac-article-content th { background: var(--hvac-navy); color: #fff; }
.hvac-article-content th,
.hvac-article-content td { border: 1px solid var(--hvac-line); min-width: 135px; padding: 12px 14px; text-align: left; }
.hvac-callout { background: var(--hvac-blue-soft); border-left: 4px solid var(--hvac-blue); border-radius: 0 12px 12px 0; margin: 26px 0; padding: 20px 22px; }
.hvac-price-callout { background: #fff5f1; border-left-color: var(--hvac-orange); }
.hvac-article-aside { position: relative; }
.hvac-aside-card { background: var(--hvac-surface); border: 1px solid var(--hvac-line); border-radius: 16px; padding: 22px; position: sticky; top: 110px; }
.hvac-aside-card h2 { color: var(--hvac-navy); font-size: 1.2rem; margin: 0 0 12px; }
.hvac-aside-card ul { display: grid; gap: 10px; list-style: none; margin: 0 0 20px; padding: 0; }
.hvac-aside-card a { color: #245777; font-size: .9rem; font-weight: 600; text-decoration: none; }

.hvac-blog-featured {
  display: grid;
  gap: 26px;
  grid-template-columns: repeat(2, 1fr);
  margin-bottom: 44px;
}
.hvac-blog-card { background: #fff; border: 1px solid var(--hvac-line); border-radius: 18px; overflow: hidden; }
.hvac-blog-card img { aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }
.hvac-blog-card-body { padding: 24px; }
.hvac-blog-card h2,
.hvac-blog-card h3 { color: var(--hvac-navy); letter-spacing: -.02em; line-height: 1.25; margin: 9px 0 12px; }
.hvac-blog-card p { color: var(--hvac-muted); line-height: 1.65; }
.hvac-blog-tag { color: var(--hvac-orange); font-size: .74rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }

@media (max-width: 1100px) {
  .hvac-hero-grid { grid-template-columns: 1fr 1fr; }
  .hvac-hero-copy { padding-left: 30px; padding-right: 30px; }
  .hvac-estimator-fields { grid-template-columns: repeat(3, 1fr); }
  .hvac-method { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .hvac-hero { padding-top: 74px; }
  .hvac-hero-grid { display: block; }
  .hvac-hero-copy { padding: 56px 24px 38px; }
  .hvac-hero-media { min-height: 390px; }
  .hvac-estimator-wrap { margin-top: -25px; }
  .hvac-estimator { grid-template-columns: 1fr; }
  .hvac-estimator-result { border-left: 0; border-top: 1px solid #c7dce9; padding: 24px 0 0; }
  .hvac-feature-grid,
  .hvac-services-grid { grid-template-columns: repeat(2, 1fr); }
  .hvac-method-steps { grid-template-columns: repeat(2, 1fr); }
  .hvac-materials-panel { grid-template-columns: 1fr; }
  .hvac-materials-media { max-height: 440px; }
  .hvac-article-layout { grid-template-columns: 1fr; }
  .hvac-aside-card { position: static; }
}

@media (max-width: 640px) {
  .hvac-hero h1 { font-size: 2.45rem; }
  .hvac-hero-actions,
  .hvac-trust-row { display: grid; width: 100%; }
  .hvac-hero-actions a { width: 100%; }
  .hvac-hero-media { min-height: 300px; }
  .hvac-estimator-wrap { padding: 0 14px; }
  .hvac-estimator { border-radius: 16px; padding: 24px 18px; }
  .hvac-estimator-fields { grid-template-columns: 1fr 1fr; }
  .hvac-estimator-fields .hvac-field:last-child { grid-column: 1 / -1; }
  .hvac-section { padding: 66px 0; }
  .hvac-section-head { align-items: flex-start; display: block; }
  .hvac-section-head p { margin-top: 16px; }
  .hvac-feature-grid,
  .hvac-services-grid,
  .hvac-method-steps,
  .hvac-blog-featured { grid-template-columns: 1fr; }
  .hvac-feature-card { min-height: 300px; }
  .hvac-materials-copy { padding: 32px 24px; }
  .hvac-cta-grid { grid-template-columns: 1fr; }
  .hvac-article-hero { padding-top: 120px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}