:root{
  --navy:#0F2A44; --navy2:#16395E; --blue:#1A5C9E;
  --orange:#F97316; --orange-d:#EA580C;
  --bg:#F7F9FC; --card:#FFFFFF; --line:#E5EAF1;
  --text:#1B2A3D; --muted:#5B6B80;
  --radius:16px; --shadow:0 10px 30px rgba(15,42,68,.08);
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:#fff;line-height:1.6}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
h1{font-size:clamp(2rem,4.5vw,3.3rem);line-height:1.08;margin:.5rem 0 .8rem;letter-spacing:-.02em;color:var(--navy)}
h2{font-size:clamp(1.5rem,3vw,2.2rem);color:var(--navy);margin:.3rem 0 1rem;letter-spacing:-.01em}
h3{color:var(--navy);margin:.4rem 0 .5rem}
.lead{color:var(--muted);max-width:760px}
.kicker{text-transform:uppercase;font-size:.78rem;font-weight:800;letter-spacing:.12em;color:var(--orange-d);margin:0}
.kicker-light{color:#FDBA74}
.center{text-align:center}.center-h{text-align:center}.center-k{text-align:center}
.white{color:#fff}
.muted{color:var(--muted)} .small{font-size:.88rem}
/* topbar */
.topbar{background:var(--navy);color:#D7E3F0;font-size:.85rem}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:8px 20px}
.topbar-item{display:flex;align-items:center;gap:6px}
.topbar-phone{color:#fff;font-weight:700;text-decoration:none}
/* header */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy)}
.logo-text{display:flex;flex-direction:column;line-height:1.1}
.logo-text strong{font-size:1.25rem;letter-spacing:.04em}
.logo-text small{color:var(--muted);font-size:.75rem}
.nav{display:flex;align-items:center;gap:18px}
.nav a{color:var(--navy);text-decoration:none;font-weight:600;font-size:.95rem}
.nav a:hover{color:var(--orange-d)}
.header-actions{display:flex;align-items:center;gap:10px}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.burger span{width:24px;height:2px;background:var(--navy);border-radius:2px}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:12px;font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font-size:.98rem;transition:.15s}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy2)}
.btn-accent{background:var(--orange);color:#fff}
.btn-accent:hover{background:var(--orange-d)}
.btn-outline{border-color:var(--navy);color:var(--navy);background:#fff}
.btn-outline:hover{background:var(--navy);color:#fff}
a:focus-visible,.btn:focus-visible,.burger:focus-visible,.field input:focus-visible,.field select:focus-visible,.field textarea:focus-visible{outline:3px solid var(--orange);outline-offset:2px}
.btn-white{background:#fff;color:var(--navy)}
.btn-lg{padding:14px 26px;font-size:1.02rem}
.btn-block{width:100%}
.nav-cta{display:none}
/* hero */
.hero{background:linear-gradient(180deg,#EFF5FB 0%,#fff 80%);padding:48px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:start}
.badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:.85rem;font-weight:600;color:var(--navy);box-shadow:var(--shadow)}
.dot{width:9px;height:9px;border-radius:50%;background:#22C55E;box-shadow:0 0 0 4px rgba(34,197,94,.18)}
.hero-sub{font-size:1.2rem;font-weight:700;color:var(--navy2)}
.hero-text{color:var(--muted)}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0 22px}
.trust-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.trust{display:flex;flex-direction:column;line-height:1.3}
.trust strong{color:var(--navy)} .trust span{font-size:.85rem;color:var(--muted)}
.hero-visual{position:relative}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.hero-card-top{display:flex;gap:16px;padding:20px;background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff}
.hc-label{margin:0;font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:#BFDBFE}
.hc-title{margin:.2rem 0;font-weight:800;font-size:1.1rem}
.hc-status{margin:0;font-size:.9rem;display:flex;align-items:center;gap:8px}
.pulse{width:10px;height:10px;border-radius:50%;background:#22C55E;display:inline-block;animation:p 1.6s infinite}
@keyframes p{0%{box-shadow:0 0 0 0 rgba(34,197,94,.6)}70%{box-shadow:0 0 0 8px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}
.boiler-illus{position:relative;flex-shrink:0}
.boiler{width:110px;height:140px;background:#fff;border-radius:14px;position:relative;padding:10px;color:var(--navy)}
.boiler-screen{background:var(--navy);color:#fff;border-radius:8px;text-align:center;padding:6px}
.boiler-screen span{font-weight:800;font-size:1.1rem;display:block}
.boiler-screen small{font-size:.65rem;color:#BFDBFE}
.boiler-lines i{display:block;height:6px;background:#E5EAF1;border-radius:4px;margin:7px 0}
.boiler-pipes{position:absolute;bottom:-12px;left:18px;right:18px;display:flex;gap:8px}
.boiler-pipes i{flex:1;height:14px;background:#CBD5E1;border-radius:0 0 6px 6px}
.flame{position:absolute;top:-8px;right:-8px;background:var(--orange);color:#fff;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px}
.hero-card-contact{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line)}
.hero-card-contact small{display:block;color:var(--muted)}
.hc-phone{font-size:1.5rem;font-weight:800;color:var(--navy);text-decoration:none}
.hc-list{list-style:none;margin:0;padding:16px 20px;display:grid;gap:8px;font-size:.93rem;color:#33475F}
.hero-exp{position:absolute;right:-8px;bottom:-16px;background:var(--orange);color:#fff;border-radius:14px;padding:10px 16px;font-weight:800;font-size:1.4rem;box-shadow:var(--shadow)}
.hero-exp span{display:block;font-size:.75rem;font-weight:600}
.hp-banner{margin-top:14px;background:linear-gradient(135deg,#EA580C,#F59E0B);border-radius:12px;padding:12px 16px;color:#fff;font-size:.93rem;box-shadow:var(--shadow)}
.hp-banner a{color:#fff;text-decoration:underline;text-underline-offset:2px}
.hp-banner a:hover{color:#FFF7ED}
/* sections */
.section{padding:64px 0}
.section-gray{background:var(--bg)}
.section-navy{background:linear-gradient(135deg,var(--navy),#1B4A7E);color:#DCE8F5}
.section-navy .small-note{color:#9DB8D2;font-size:.9rem}
.cards-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.icon svg{width:24px;height:24px}
.icon-navy{background:#E3ECF6;color:var(--navy)}
.icon-orange{background:#FFEDD5;color:var(--orange-d)}
.icon-blue{background:#DBEAFE;color:var(--blue)}
.icon-green{background:#DCFCE7;color:#15803D}
/* services */
.service{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px;margin-top:22px;box-shadow:var(--shadow)}
.service.reverse{grid-template-columns:.9fr 1.1fr}
.service.reverse .service-visual{order:-1}
.service-num{font-size:.8rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--orange-d)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.chips span{background:#FFF7ED;border:1px solid #FED7AA;color:#9A3412;border-radius:999px;padding:6px 14px;font-weight:600;font-size:.88rem}
.chips-blue span{background:#EFF6FF;border-color:#BFDBFE;color:#1E40AF}
.check-list{list-style:none;padding:0;margin:12px 0 18px;display:grid;gap:8px}
.check-list li{padding-left:28px;position:relative}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;background:#DCFCE7;color:#15803D;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:800}
.two-col{grid-template-columns:1fr 1fr;gap:8px 18px}
.note{background:#EFF6FF;border-left:4px solid var(--blue);padding:12px 14px;border-radius:0 10px 10px 0;font-size:.93rem;margin:12px 0 18px}
.alert{background:#FFF7ED;border:1px solid #FED7AA;padding:14px;border-radius:12px;margin:14px 0 18px}
.btn-row{display:flex;gap:10px;flex-wrap:wrap}
.service-visual{border-radius:16px;min-height:280px;display:flex;align-items:stretch;padding:22px;color:#fff}
.sv1{background:linear-gradient(135deg,#0F2A44,#1A5C9E)}
.sv2{background:linear-gradient(135deg,#EA580C,#F59E0B)}
.sv3{background:linear-gradient(135deg,#0E3B2E,#16A34A)}
.sv-card{background:rgba(255,255,255,.96);color:var(--navy);border-radius:14px;padding:22px;width:100%;align-self:center}
.sv-card strong{font-size:1.2rem} .sv-card span{display:block;color:var(--muted);margin:6px 0 12px}
.sv-row,.sv-steps{display:flex;gap:8px;flex-wrap:wrap}
.sv-row i,.sv-steps i{font-style:normal;background:#EFF6FF;border-radius:8px;padding:6px 10px;font-size:.85rem;font-weight:600}
.sv-phone{font-size:1.6rem;font-weight:800;color:var(--navy);text-decoration:none}
.sv-card small{color:var(--muted)}
/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);position:relative}
.step-n{display:inline-flex;width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;font-weight:800;align-items:center;justify-content:center;margin-bottom:10px}
/* brands */
.brands{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin:22px 0}
.brands span{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);color:#fff;font-weight:800;font-size:1.1rem;padding:12px 26px;border-radius:999px}
/* area */
.grid-2{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:start}
.area-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow)}
.area-card ul{list-style:none;padding:0;margin:0 0 16px;display:grid;gap:10px}
.area-card li{background:var(--bg);border-radius:10px;padding:10px 14px}
/* faq */
.narrow{max-width:800px}
.accordion{display:grid;gap:12px;margin-top:24px}
.accordion details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;box-shadow:var(--shadow)}
.accordion summary{font-weight:700;color:var(--navy);cursor:pointer;font-size:1.02rem}
.accordion p{color:#3B4E64}
/* cta band */
.cta-band{background:linear-gradient(135deg,var(--navy) 0%,var(--blue) 70%);color:#fff;padding:56px 0}
.cta-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center}
.cta-band h2{color:#fff}
.cta-contacts{display:grid;gap:4px;margin:14px 0 18px}
.cta-phone{font-size:2rem;font-weight:800;color:#fff;text-decoration:none}
.cta-phone:hover{color:#FDBA74}
.cta-mail{color:#BFDBFE;font-weight:600}
.cta-loc{color:#9DB8D2;font-size:.9rem}
.cta-card{background:#fff;color:var(--navy);border-radius:16px;padding:24px}
/* contact */
.contact-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:26px;margin-top:24px;align-items:start}
.form{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:grid;gap:6px;margin-bottom:14px}
.field label{font-weight:600;font-size:.92rem}
.opt{font-weight:400;color:var(--muted)}
.field input,.field select,.field textarea{border:1.5px solid var(--line);border-radius:10px;padding:12px;font-size:.97rem;font-family:inherit}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,92,158,.12)}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:.9rem;margin:8px 0 16px}
.form-note{font-weight:600}
.contact-info{background:var(--navy);color:#DCE8F5;border-radius:20px;padding:26px}
.contact-info h3{color:#fff} .contact-info a{color:#fff;font-weight:700}
.contact-info hr{border:0;border-top:1px solid rgba(255,255,255,.2);margin:16px 0}
/* footer */
.footer{background:#0B1E33;color:#9DB8D2;padding:40px 0;font-size:.92rem}
.footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:24px}
.footer strong{color:#fff} .footer a{color:#BFDBFE}
/* mobile call */
.mobile-call{display:none;position:fixed;bottom:12px;left:12px;right:12px;z-index:60;background:var(--orange);color:#fff;text-align:center;font-weight:800;text-decoration:none;padding:15px;border-radius:14px;box-shadow:0 8px 24px rgba(234,88,12,.4)}
@media(max-width:960px){
  .hero-grid,.grid-2,.cta-grid,.contact-grid{grid-template-columns:1fr}
  .cards-4,.steps{grid-template-columns:1fr 1fr}
  .service,.service.reverse{grid-template-columns:1fr}
  .service.reverse .service-visual{order:0}
  .nav{position:fixed;top:0;right:-100%;width:min(320px,85vw);height:100vh;background:#fff;flex-direction:column;align-items:stretch;padding:70px 24px 24px;gap:6px;transition:.25s;box-shadow:-10px 0 30px rgba(0,0,0,.15)}
  .nav.open{right:0}
  .nav a{padding:12px 6px;border-bottom:1px solid var(--line)}
  .nav-cta{display:inline-flex;margin-top:12px}
  .burger{display:flex}
  .header-call{display:none}
  .footer-grid{grid-template-columns:1fr}
  .hide-mobile{display:none}
}
@media(max-width:600px){
  .cards-4,.steps,.form-row,.two-col{grid-template-columns:1fr}
  .trust-row{grid-template-columns:1fr 1fr}
  .mobile-call{display:block}
  body{padding-bottom:70px}
  .section{padding:44px 0}
}