/* ============================================
   HVAC EXPERTS — Design tokens
   ============================================ */
:root{
  --ink:        #0F1410;   /* near-black charcoal-green */
  --paper:      #F5F0E6;   /* warm off-white, brushed aluminum */
  --paper-dim:  #EAE3D3;
  --hot:        #FF5A1F;   /* burner-flame orange */
  --hot-soft:   #FFE3D4;
  --cold:       #3D6B5C;   /* refrigerant-line teal-green */
  --cold-soft:  #DCE8E2;
  --gauge:      #8A8F88;   /* secondary / muted text */
  --line:       rgba(15,20,16,0.12);
  --line-strong:rgba(15,20,16,0.22);

  --font-display: 'Archivo Expanded', 'Archivo', sans-serif;
  --font-body: 'Archivo', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --container: 1180px;
  --radius: 14px;
  --ease: cubic-bezier(.2,.8,.2,1);
}

*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img{max-width:100%; display:block;}
a{color:inherit; text-decoration:none;}
ul{list-style:none;}
button{font-family:inherit; cursor:pointer;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; scroll-behavior:auto !important;}
}

.wrap{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

:focus-visible{
  outline: 3px solid var(--hot);
  outline-offset: 2px;
  border-radius: 4px;
}

/* grain overlay for texture, subtle */
.grain{
  position: fixed; inset:0; pointer-events:none; z-index: 999;
  opacity: 0.035; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

h1,h2,h3,h4{
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.05;
  text-transform: uppercase;
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cold);
  margin-bottom: 12px;
  display:flex; align-items:center; gap:8px;
}
.eyebrow::before{
  content:'';
  width: 16px; height: 2px;
  background: var(--hot);
  display:inline-block;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.01em;
  border: 2px solid transparent;
  transition: transform .18s var(--ease), background .18s, color .18s, border-color .18s;
  white-space: nowrap;
}
.btn:active{ transform: scale(0.97); }
.btn-primary{
  background: var(--hot);
  color: var(--paper);
  box-shadow: 0 4px 0 0 #C73F0E;
}
.btn-primary:hover{ background:#FF6E3A; transform: translateY(-1px); }
.btn-ghost{
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover{ background: var(--ink); color: var(--paper); }
.btn-lg{ padding: 16px 30px; font-size: 16px; }
.btn-block{ width:100%; }

/* ============================================
   HEADER
   ============================================ */
.site-header{
  position: sticky; top:0; z-index: 100;
  background: rgba(245,240,230,0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  height: 78px;
  gap: 24px;
}
.logo{ display:flex; align-items:center; gap:10px; flex-shrink:0; }
.logo-mark{ color: var(--hot); display:flex; }
.logo-text{ font-family: var(--font-display); font-size: 19px; letter-spacing: -0.01em; text-transform:uppercase; }
.logo-text strong{ color: var(--hot); }

.main-nav{ display:flex; gap: 32px; flex:1; justify-content:center; }
.main-nav a{
  font-weight: 600; font-size: 15px; position:relative; padding: 6px 0;
  color: var(--ink);
}
.main-nav a::after{
  content:''; position:absolute; left:0; right:0; bottom:0; height:2px;
  background: var(--hot); transform: scaleX(0); transition: transform .2s var(--ease);
}
.main-nav a:hover::after{ transform: scaleX(1); }

.header-actions{ display:flex; align-items:center; gap:14px; flex-shrink:0; }
.phone-pill{
  display:flex; align-items:center; gap:8px;
  font-family: var(--font-mono); font-size: 14px; font-weight:600;
  color: var(--ink);
  padding: 8px 14px;
  border: 1.5px solid var(--line-strong);
  border-radius: 999px;
}
.phone-pill:hover{ border-color: var(--cold); color: var(--cold); }

.whatsapp-pill{
  display:flex; align-items:center; gap:8px;
  font-size: 14px; font-weight:600;
  color: #25D366;
  padding: 8px 14px;
  border: 1.5px solid var(--line-strong);
  border-radius: 999px;
  transition: border-color .15s, background .15s;
}
.whatsapp-pill:hover{ border-color:#25D366; background: rgba(37,211,102,0.08); }

.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width: 40px; height: 40px; background:none; border:none;
}
.nav-toggle span{ width: 22px; height: 2px; background: var(--ink); transition: all .25s var(--ease); }
.nav-toggle.open span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2){ opacity:0; }
.nav-toggle.open span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

.mobile-nav{
  position: fixed; top:78px; left:0; right:0; bottom:0; z-index:99;
  background: var(--paper);
  display:flex; flex-direction:column; gap:4px; padding: 24px;
  transform: translateX(100%);
  transition: transform .3s var(--ease);
  overflow-y:auto;
}
.mobile-nav.open{ transform: translateX(0); }
.mobile-nav a{
  font-family: var(--font-display); font-size: 22px; text-transform:uppercase;
  padding: 14px 4px; border-bottom: 1px solid var(--line);
}
.mobile-phone{ font-family: var(--font-mono) !important; font-size:18px !important; color: var(--cold); }
.mobile-whatsapp, .mobile-gbp{
  display:flex; align-items:center; gap:10px;
  font-size: 16px !important; font-weight:600;
  padding: 12px 4px !important;
}
.mobile-whatsapp{ color:#25D366; }
.mobile-gbp{ color: var(--ink); }
.mobile-nav .btn{ margin-top: 16px; }

/* ============================================
   HERO
   ============================================ */
.hero{
  position: relative;
  padding: 64px 0 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 85% 15%, var(--hot-soft) 0%, transparent 45%),
    radial-gradient(circle at 5% 85%, var(--cold-soft) 0%, transparent 45%);
}
.hero-inner{
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  padding-bottom: 56px;
}
.hero-copy h1{
  font-size: clamp(42px, 6vw, 72px);
  margin: 14px 0 20px;
}
.dial-word{ color: var(--hot); }
.cursor-blink{
  display:inline-block; color: var(--hot);
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink{ 50%{ opacity:0; } }

.hero-sub{
  font-size: 18px; line-height: 1.6; color: #3a4038;
  max-width: 480px; margin-bottom: 32px;
}
.hero-actions{ display:flex; gap: 14px; flex-wrap:wrap; margin-bottom: 40px; }

.hero-stats{
  display:flex; gap: 36px;
}
.hero-stats div{ display:flex; flex-direction:column; gap:2px; }
.hero-stats dt{ font-family: var(--font-mono); font-size: 24px; font-weight:700; color: var(--ink); }
.hero-stats dd{ font-size: 13px; color: var(--gauge); text-transform:uppercase; letter-spacing:0.04em; }

/* --- thermostat dial --- */
.hero-dial-wrap{ display:flex; flex-direction:column; align-items:center; gap:14px; }
.dial-instruction{
  font-family: var(--font-mono); font-size: 12px; letter-spacing:0.1em;
  text-transform:uppercase; color: var(--gauge);
}
.dial{
  width: min(320px, 78vw); aspect-ratio: 1/1; cursor: grab; touch-action:none; user-select:none;
}
.dial:active{ cursor: grabbing; }
.dial-bg{ fill: var(--paper); }
.dial-track{ stroke: var(--line); }
.dial-progress{ stroke: var(--hot); transition: stroke .25s; }
.dial-face{
  fill: var(--ink);
  filter: drop-shadow(0 8px 22px rgba(15,20,16,0.25));
}
.dial-temp{
  font-family: var(--font-mono); font-size: 44px; font-weight:700;
  fill: var(--paper);
}
.dial-mode{
  font-family: var(--font-mono); font-size: 15px; font-weight:600; letter-spacing: 0.15em;
  fill: var(--hot);
}
.dial-handle{
  fill: var(--paper); stroke: var(--hot); stroke-width: 4;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.3));
}
.tick{ stroke: var(--gauge); stroke-width: 2; opacity:0.5; }
.dial-caption{ font-size: 14px; color: var(--gauge); font-weight:600; min-height: 20px; }

/* marquee */
.hero-marquee{
  background: var(--ink); color: var(--paper);
  padding: 12px 0; overflow:hidden; white-space:nowrap;
}
.marquee-track{
  display:inline-flex; gap: 20px;
  animation: scroll-left 26s linear infinite;
  font-family: var(--font-mono); font-size: 13px; letter-spacing:0.08em;
}
.marquee-track span{ flex-shrink:0; }
.marquee-track span:nth-child(odd){ color: var(--hot); }
@keyframes scroll-left{ from{ transform: translateX(0); } to{ transform: translateX(-50%); } }

/* ============================================
   TRUST STRIP
   ============================================ */
.trust-strip{ background: var(--paper-dim); border-bottom: 1px solid var(--line); }
.trust-inner{
  display:flex; justify-content:space-between; flex-wrap:wrap; gap: 20px;
  padding: 22px 24px;
}
.trust-item{
  display:flex; align-items:center; gap:10px;
  font-size: 14px; font-weight:600; color: var(--ink);
}
.trust-item svg{ color: var(--cold); flex-shrink:0; }

/* ============================================
   SECTION HEAD (shared)
   ============================================ */
.section-head{ max-width: 640px; margin-bottom: 48px; }
.section-head h2{ font-size: clamp(30px, 4vw, 46px); margin-bottom: 14px; }
.section-lede{ font-size: 17px; color: #3a4038; line-height:1.6; }

section{ padding: 96px 0; }

/* ============================================
   SERVICES
   ============================================ */
.service-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.service-card{
  position:relative;
  background: var(--paper);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: border-color .2s, transform .2s var(--ease), box-shadow .2s;
}
.service-card:hover{
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 14px 30px -10px rgba(15,20,16,0.15);
}
.service-icon{
  width: 52px; height:52px; border-radius: 12px;
  display:flex; align-items:center; justify-content:center;
  background: var(--accent); color: var(--paper);
  margin-bottom: 20px;
}
.service-card h3{ font-size: 20px; text-transform:none; margin-bottom: 10px; letter-spacing:0; }
.service-card p{ color: #3a4038; font-size: 15px; line-height:1.55; }
.service-tag{
  position:absolute; top:22px; right:22px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing:0.05em; text-transform:uppercase;
  background: var(--ink); color: var(--paper);
  padding: 4px 10px; border-radius: 999px;
}

/* ============================================
   PROCESS RAIL
   ============================================ */
.process{ background: var(--ink); color: var(--paper); }
.process .eyebrow{ color: var(--hot); }
.process .eyebrow::before{ background: var(--cold); }
.process h2{ color: var(--paper); }

.process-rail{
  position:relative;
  display:grid; grid-template-columns: repeat(4,1fr); gap: 28px;
  margin-top: 24px;
}
.rail-line{
  position:absolute; top: 20px; left:0; right:0; height:2px;
  background: rgba(245,240,230,0.18);
  z-index:0;
}
.process-step{ position:relative; z-index:1; }
.step-marker{
  display:inline-flex; align-items:center;
  font-family: var(--font-mono); font-size: 12px; font-weight:700; letter-spacing:0.1em;
  color: var(--ink); background: var(--hot);
  padding: 7px 12px; border-radius: 999px;
  margin-bottom: 20px;
}
.process-step:nth-child(odd) .step-marker{ background: var(--cold); }
.process-step h3{
  font-size: 19px; text-transform:none; letter-spacing:0; margin-bottom: 10px;
  font-family: var(--font-display);
}
.process-step p{ color: rgba(245,240,230,0.7); font-size: 14.5px; line-height:1.6; }

/* ============================================
   COVERAGE
   ============================================ */
.coverage-inner{
  display:grid; grid-template-columns: 1.2fr 0.8fr; gap: 56px; align-items:center;
}
.coverage-copy h2{ font-size: clamp(28px,3.6vw,40px); margin-bottom:16px; }
.coverage-copy p{ color:#3a4038; font-size:16px; line-height:1.6; margin-bottom:24px; max-width:480px; }
.coverage-list{ display:grid; grid-template-columns: 1fr 1fr; gap: 12px 20px; }
.coverage-list li{
  font-weight:600; font-size:14.5px;
  padding-left: 18px; position:relative;
}
.coverage-list li::before{
  content:''; position:absolute; left:0; top:7px; width:8px; height:8px;
  background: var(--hot); border-radius:50%;
}
.coverage-readout{
  background: var(--ink); border-radius: var(--radius); padding: 8px 28px;
}
.readout-row{
  display:flex; justify-content:space-between; align-items:center;
  padding: 22px 0; border-bottom: 1px solid rgba(245,240,230,0.12);
}
.readout-row:last-child{ border-bottom:none; }
.readout-label{ font-family: var(--font-mono); font-size: 12px; letter-spacing:0.08em; color: rgba(245,240,230,0.55); }
.readout-value{ font-family: var(--font-mono); font-size: 22px; font-weight:700; color: var(--paper); }

/* ============================================
   REVIEWS
   ============================================ */
.review-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap:22px; }
.review-card{
  background: var(--paper-dim);
  border-radius: var(--radius);
  padding: 30px 26px;
  border-left: 4px solid var(--cold);
}
.review-card:nth-child(2){ border-left-color: var(--hot); }
.stars{ color: var(--hot); font-size: 15px; margin-bottom: 14px; letter-spacing:2px; }
.review-card blockquote{ font-size: 15.5px; line-height:1.6; margin-bottom: 18px; color: var(--ink); }
.review-card figcaption{ font-family: var(--font-mono); font-size: 13px; color: var(--gauge); }

/* ============================================
   FAQ
   ============================================ */
.faq-list{ display:flex; flex-direction:column; gap: 2px; max-width: 760px; }
.faq-item{
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.faq-item summary{
  font-family: var(--font-display); font-size: 17px; text-transform:none; letter-spacing:0;
  cursor:pointer; list-style:none; position:relative; padding-right: 32px;
  display:flex; align-items:center;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:'+'; position:absolute; right:0; font-size:24px; color: var(--hot);
  transition: transform .2s;
}
.faq-item[open] summary::after{ transform: rotate(45deg); }
.faq-item p{ margin-top: 14px; color:#3a4038; font-size:15px; line-height:1.6; max-width: 640px; }

/* ============================================
   CONTACT
   ============================================ */
.contact{ background: var(--paper-dim); }
.contact-inner{ display:grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items:start; }
.contact-copy h2{ font-size: clamp(28px,3.6vw,42px); margin-bottom:16px; }
.contact-copy p{ color:#3a4038; font-size:16px; line-height:1.6; margin-bottom: 32px; max-width: 420px; }
.contact-direct{ display:flex; flex-direction:column; gap: 14px; }
.contact-direct-item{
  display:flex; align-items:center; gap:12px;
  font-family: var(--font-mono); font-weight:600; font-size:15px;
  padding: 14px 18px; background: var(--paper); border-radius: 12px;
  border: 1.5px solid var(--line);
}
.contact-direct-item svg{ color: var(--hot); flex-shrink:0; }
.contact-direct-item:hover{ border-color: var(--cold); }
.contact-direct-whatsapp svg{ color:#25D366; }
.contact-direct-whatsapp:hover{ border-color:#25D366; }

/* ============================================
   FLOATING WHATSAPP BUTTON
   ============================================ */
.whatsapp-float{
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 90;
  width: 58px; height: 58px;
  border-radius: 50%;
  background: #25D366;
  color: #fff;
  display:flex; align-items:center; justify-content:center;
  box-shadow: 0 6px 20px rgba(15,20,16,0.28);
  transition: transform .2s var(--ease);
}
.whatsapp-float:hover{ transform: scale(1.08); }
.whatsapp-float:active{ transform: scale(0.96); }

.contact-form{
  background: var(--paper); border-radius: var(--radius);
  padding: 36px; border: 1.5px solid var(--line);
  display:flex; flex-direction:column; gap: 18px;
}
.form-row{ display:flex; flex-direction:column; gap:6px; }
.form-row label{ font-size:13px; font-weight:700; text-transform:uppercase; letter-spacing:0.04em; color: var(--gauge); }
.form-row input, .form-row select, .form-row textarea{
  font-family: var(--font-body); font-size: 15px;
  padding: 13px 16px; border: 1.5px solid var(--line-strong); border-radius: 10px;
  background: var(--paper); color: var(--ink);
  transition: border-color .15s;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus{
  border-color: var(--hot); outline:none;
}
.form-row textarea{ resize: vertical; font-family: var(--font-body); }
.form-note{ font-size: 13px; color: var(--gauge); text-align:center; }

/* ============================================
   FOOTER
   ============================================ */
.site-footer{ background: var(--ink); color: var(--paper); padding-top: 64px; }
.footer-inner{
  display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 48px; border-bottom: 1px solid rgba(245,240,230,0.14);
}
.footer-brand .logo-text{ font-size: 20px; }
.footer-brand p{ margin-top:12px; color: rgba(245,240,230,0.6); font-size:14px; max-width:220px; }
.footer-col h4{
  font-size: 13px; text-transform:uppercase; letter-spacing:0.06em; color: var(--hot);
  margin-bottom: 16px; font-family: var(--font-mono); font-weight:600;
}
.footer-col{ display:flex; flex-direction:column; gap: 11px; }
.footer-col a{ font-size: 14.5px; color: rgba(245,240,230,0.75); }
.footer-col a:hover{ color: var(--paper); }
.footer-license{ font-family: var(--font-mono); font-size:13px; color: rgba(245,240,230,0.5); margin-top:4px; }
.footer-bottom{
  display:flex; justify-content:space-between; padding: 22px 24px;
  font-size: 13px; color: rgba(245,240,230,0.5);
}

/* ============================================
   RESPONSIVE — TABLET
   ============================================ */
@media (max-width: 980px){
  .main-nav{ display:none; }
  .nav-toggle{ display:flex; }
  .header-actions .phone-pill{ display:none; }
  .header-actions .whatsapp-pill{ display:none; }

  .hero-inner{ grid-template-columns: 1fr; text-align:center; }
  .hero-copy{ display:flex; flex-direction:column; align-items:center; }
  .hero-sub{ margin-left:auto; margin-right:auto; }
  .hero-actions{ justify-content:center; }
  .hero-stats{ justify-content:center; }
  .hero-dial-wrap{ margin-top: 16px; }

  .service-grid{ grid-template-columns: repeat(2,1fr); }
  .process-rail{ grid-template-columns: repeat(2,1fr); row-gap: 40px; }
  .rail-line{ display:none; }

  .coverage-inner{ grid-template-columns:1fr; }
  .coverage-readout{ max-width: 480px; }

  .review-grid{ grid-template-columns: 1fr; }

  .contact-inner{ grid-template-columns:1fr; }
  .footer-inner{ grid-template-columns: 1fr 1fr; row-gap: 36px; }
}

/* ============================================
   RESPONSIVE — MOBILE
   ============================================ */
@media (max-width: 600px){
  section{ padding: 64px 0; }
  .hero{ padding-top: 40px; }
  .hero-copy h1{ font-size: clamp(36px, 11vw, 48px); }
  .hero-sub{ font-size:16px; }
  .hero-stats{ gap: 20px; flex-wrap:wrap; }
  .hero-actions{ flex-direction:column; width:100%; }
  .hero-actions .btn{ width:100%; }

  .trust-inner{ flex-direction:column; align-items:flex-start; gap:14px; }

  .service-grid{ grid-template-columns: 1fr; }
  .process-rail{ grid-template-columns: 1fr; }

  .coverage-list{ grid-template-columns: 1fr; }
  .readout-row{ padding: 16px 0; }
  .readout-value{ font-size:18px; }

  .contact-form{ padding: 24px; }

  .footer-inner{ grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom{ flex-direction:column; gap:6px; text-align:center; }
  .whatsapp-float{ width:52px; height:52px; bottom:16px; right:16px; }
}

@media (max-width: 380px){
  .wrap{ padding: 0 16px; }
  .header-inner{ height: 68px; }
  .logo-text{ font-size: 16px; }
}