:root { --ink: #101827; --deep: #0d2330; --blue: #176b87; --blue-dark: #11566c; --ice: #eef7f8; --paper: #fff; --line: #c9d9dd; --muted: #5a6872; --gold: #d59b35; }
body { background: var(--ice); color: var(--ink); }
.demo-nav { position: sticky; top: 0; background: rgba(238,247,248,.95); border-bottom: 1px solid var(--line); padding: 1rem 2rem; }
.demo-nav .nav-logo { color: var(--ink); }
.demo-nav-actions { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.demo-nav-actions a { color: var(--ink); text-decoration: none; font-weight: 800; }
.demo-nav-actions .quote-link { color: var(--blue); }
.demo-hero { min-height: auto; padding: 7rem 0 5rem; background: linear-gradient(90deg, rgba(16,24,39,.94), rgba(16,24,39,.58), rgba(16,24,39,.26)), image-set(url('/images/generated-samples/responsive/hvac-hero-ac-service-720.webp') 1x, url('/images/generated-samples/optimized/hvac-hero-ac-service.webp') 2x); background-size: cover; background-position: center; color: #fff; }
.hero-hvac-layout { display: grid; gap: 2rem; align-items: end; }
.demo-hero .hero-content { max-width: 760px; }
.demo-hero h1 { max-width: 820px; }
.demo-hero p { color: rgba(255,255,255,.82); }
.demo-btn { background: var(--blue); color: #fff; border-radius: 8px; }
.demo-btn:hover { background: var(--blue-dark); }
.demo-btn.secondary { background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25); }
.hero-card { background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22); border-radius: 14px; padding: 1.25rem; backdrop-filter: blur(14px); }
.hero-card h2 { color: #fff; font-size: 1.15rem; margin-bottom: .75rem; }
.hero-card ul { display: grid; gap: .7rem; list-style: none; }
.hero-card li { color: rgba(255,255,255,.82); font-weight: 650; }
.hero-card li::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--gold); margin-right: .55rem; }
.trust-bar { background: var(--paper); border-bottom: 1px solid var(--line); }
.trust-grid { display: grid; grid-template-columns: 1fr; gap: 1px; background: var(--line); border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
.trust-item { background: var(--paper); padding: 1rem; }
.trust-item strong { display: block; color: var(--ink); }
.trust-item span { display: block; color: var(--muted); font-size: .92rem; margin-top: .25rem; }
.section { padding: 5rem 0; }
.section.white { background: #fff; }
.section-head { max-width: 780px; margin-bottom: 2rem; }
.section-head h2 { font-size: clamp(2rem,4vw,3.2rem); margin-bottom: .7rem; }
.section-head p { color: var(--muted); font-size: 1.05rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: 1rem; }
.demo-card { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 1.4rem; }
.demo-card.alt { background: var(--ice); }
.demo-card h3 { margin-bottom: .5rem; }
.demo-card p, .demo-card li { color: var(--muted); }
.demo-card ul { padding-left: 1.2rem; }
.service-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.service-card { display: flex; flex-direction: column; justify-content: space-between; min-height: 230px; }
.service-meta { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem; }
.service-meta span { border: 1px solid var(--line); border-radius: 999px; padding: .3rem .5rem; color: var(--muted); font-size: .78rem; font-weight: 800; background: var(--ice); }
.media-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.media-card { background: #fff; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.media-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.media-card div { padding: 1.2rem; }
.media-card h3 { margin-bottom: .45rem; }
.media-card p { color: var(--muted); }
.split-proof { display: grid; gap: 1rem; align-items: stretch; }
.proof-panel { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 1.4rem; }
.proof-panel h3 { margin-bottom: .65rem; }
.proof-list { display: grid; gap: .7rem; list-style: none; }
.proof-list li { color: var(--muted); border-top: 1px solid rgba(16,24,39,.08); padding-top: .7rem; }
.proof-list li:first-child { border-top: 0; padding-top: 0; }
.offer-strip { display: grid; gap: 1rem; }
.offer-card { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 1.2rem; }
.offer-card strong { display: block; margin-bottom: .4rem; }
.offer-card span { color: var(--muted); }
.request-layout { display: grid; gap: 1rem; align-items: start; }
.request-card { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.request-head { background: var(--deep); color: #fff; display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: 1rem 1.2rem; }
.request-head span { color: rgba(255,255,255,.72); font-size: .86rem; font-weight: 800; }
.request-fields { display: grid; grid-template-columns: 1fr; gap: .8rem; padding: 1rem; }
.fake-field { border: 1px solid var(--line); border-radius: 8px; padding: .85rem; background: #fff; }
.fake-field label { display: block; font-size: .78rem; font-weight: 900; color: var(--muted); margin-bottom: .3rem; text-transform: uppercase; letter-spacing: .08em; }
.fake-field div { color: var(--ink); font-weight: 850; }
.process-list { display: grid; gap: 1rem; counter-reset: step; }
.process-step { counter-increment: step; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 1.2rem; display: grid; grid-template-columns: auto 1fr; gap: 1rem; }
.process-step::before { content: counter(step); width: 38px; height: 38px; border-radius: 9px; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 900; }
.process-step p { color: var(--muted); }
.area-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.area-map { min-height: 320px; border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(135deg, rgba(23,107,135,.12), rgba(16,24,39,.08)), #fff; padding: 1.2rem; display: grid; align-content: space-between; }
.area-pills { display: flex; flex-wrap: wrap; gap: .5rem; }
.area-pills span { background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: .45rem .65rem; font-weight: 850; color: var(--ink); }
.faq-grid { display: grid; gap: .75rem; }
details { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.15rem; }
summary { cursor: pointer; color: var(--ink); font-weight: 900; }
details p { color: var(--muted); margin-top: .7rem; }
.cta-band { background: var(--ink); color: #fff; padding: 4rem 0; }
.cta-band p { color: rgba(255,255,255,.75); }
.cta-band .demo-card { color: var(--ink); }
.cta-band .demo-card h3 { color: var(--ink); }
.cta-band .demo-card p,
.cta-band .demo-card li { color: var(--muted); }
.final-cta { display: grid; gap: 1rem; align-items: center; }
.demo-label { background: #111827; color: #fff; text-align: center; padding: .85rem 1rem; font-size: .8rem; letter-spacing: .08em; }
.sticky-mobile { display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; grid-template-columns: 1fr 1fr; background: var(--deep); border-top: 1px solid rgba(255,255,255,.16); }
.sticky-mobile a { color: #fff; text-decoration: none; text-align: center; font-weight: 900; padding: .9rem .7rem; }
.sticky-mobile a:first-child { background: var(--blue); }
@media (min-width: 760px) {
    .hero-hvac-layout { grid-template-columns: 1.12fr .88fr; }
    .service-grid { grid-template-columns: repeat(3, 1fr); }
    .media-grid { grid-template-columns: repeat(3, 1fr); }
    .split-proof { grid-template-columns: .95fr 1.05fr; }
    .offer-strip { grid-template-columns: repeat(3, 1fr); }
    .request-layout { grid-template-columns: .82fr 1.18fr; }
    .request-fields { grid-template-columns: repeat(2, 1fr); }
    .area-grid { grid-template-columns: .9fr 1.1fr; }
    .trust-grid { grid-template-columns: repeat(4, 1fr); }
    .final-cta { grid-template-columns: 1fr auto; }
}
@media (max-width: 820px) {
    .hero h1 { font-size: 2.85rem; }
    .demo-nav { padding: .9rem 1rem; }
    .demo-nav-actions { display: none; }
    .demo-hero { padding: 4.5rem 0 5rem; }
}
@media (max-width: 520px) {
    .sticky-mobile { display: grid; }
    body { padding-bottom: 56px; }
}
@media (max-width: 430px) {
    .hero h1 { font-size: 2.55rem; }
    .btn-premium { width: 100%; }
}