:root{--ink:#153247;--ink2:#0e2433;--muted:#557080;--line:#dce7ed;--soft:#f4f8fa;--white:#fff;--amber:#f28a2f;--amber2:#c95e08;--teal:#0f6d73;--teal2:#0a5156;--red:#a8332b;--shadow:0 18px 50px rgba(18,54,73,.10);--shadow-sm:0 10px 26px rgba(18,54,73,.07);--radius:24px;--max:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.62;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img,svg{max-width:100%;display:block}button,input,textarea,select{font:inherit}.shell{width:min(var(--max),calc(100% - 40px));margin-inline:auto}.narrow{width:min(860px,calc(100% - 40px));margin-inline:auto}.section{padding:86px 0}.section-tight{padding:58px 0}.skip-link{position:absolute;left:12px;top:-60px;z-index:999;background:#fff;color:var(--ink);padding:10px 14px;border:2px solid var(--ink);border-radius:10px}.skip-link:focus{top:12px}:focus-visible{outline:3px solid var(--amber);outline-offset:3px}.eyebrow{margin:0 0 13px;text-transform:uppercase;letter-spacing:.14em;font-size:.74rem;font-weight:900;color:var(--amber2)}h1,h2,h3{margin:0;color:var(--ink2);line-height:1.09;letter-spacing:-.03em}h1{font-size:clamp(2.35rem,3.7vw,4rem);max-width:720px}h2{font-size:clamp(1.8rem,2.8vw,3rem)}h3{font-size:1.18rem;letter-spacing:-.018em;line-height:1.22}p{margin:0 0 1em}.lead{font-size:clamp(1.04rem,1.4vw,1.22rem);color:#4f6675;max-width:760px}.small{font-size:.88rem;color:var(--muted)}.center{text-align:center}.section-lead{max-width:760px;margin:18px auto 0;text-align:center;color:var(--muted);font-size:1.05rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;border:0;border-radius:999px;padding:14px 22px;background:var(--amber);color:#1e2a31;font-weight:900;box-shadow:0 10px 24px rgba(242,138,47,.25);transition:.18s ease;cursor:pointer}.btn:hover{background:#ff9c43;transform:translateY(-1px)}.btn-dark{background:var(--ink2);color:#fff;box-shadow:none}.btn-dark:hover{background:#1b4259}.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line);box-shadow:none}.btn-small{padding:11px 17px;font-size:.9rem}.btn-wide{width:100%}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid rgba(220,231,237,.92);backdrop-filter:blur(12px)}.nav-wrap{height:78px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:12px;min-width:max-content}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,var(--teal),var(--teal2));color:#fff;font-weight:950;letter-spacing:-.05em}.brand strong{display:block;font-size:1.04rem;color:var(--ink2)}.brand small{display:block;font-size:.67rem;color:#718796;margin-top:2px}.main-nav{display:flex;align-items:center;gap:22px;margin-left:auto}.main-nav a{font-size:.91rem;font-weight:800;color:#496476}.main-nav a:hover{color:var(--ink2)}.nav-toggle{display:none;margin-left:auto;background:transparent;border:0;padding:8px}.nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;border-radius:4px}
.hero{padding:66px 0 62px;background:radial-gradient(circle at 90% 18%,rgba(15,109,115,.10),transparent 28%),linear-gradient(180deg,#f8fbfc 0,#fff 82%);overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}.hero-copy .lead{margin-top:22px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.hero-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 22px;margin-top:26px;color:#4e6979;font-size:.92rem}.hero-points span{display:flex;align-items:center;gap:8px}.hero-points span::before{content:"";width:8px;height:8px;background:var(--amber);border-radius:50%;box-shadow:0 0 0 4px rgba(242,138,47,.12)}
.service-panel{min-height:470px;border-radius:32px;background:linear-gradient(155deg,#173f47,#0c2b32 68%,#092128);box-shadow:0 28px 85px rgba(14,36,51,.22);position:relative;overflow:hidden;border:1px solid rgba(255,255,255,.08)}.service-panel:before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;right:-90px;top:-100px;background:radial-gradient(circle,rgba(242,138,47,.24),transparent 68%)}.panel-top{display:flex;justify-content:space-between;padding:24px 26px;color:#d4e5e6;font-size:.72rem;text-transform:uppercase;letter-spacing:.12em}.status-dot{display:flex;align-items:center;gap:8px}.status-dot:before{content:"";width:8px;height:8px;background:#79d6aa;border-radius:50%;box-shadow:0 0 0 5px rgba(121,214,170,.12)}.diagnostic-stage{position:absolute;left:28px;right:28px;top:78px;bottom:72px;border:1px solid rgba(255,255,255,.10);background:rgba(255,255,255,.04);border-radius:22px;padding:22px;display:grid;grid-template-columns:.86fr 1.14fr;gap:18px;align-items:center}.boiler-focus{min-height:260px;display:grid;place-items:center;border-right:1px solid rgba(255,255,255,.09);position:relative}.boiler-focus svg{width:180px;height:auto}.boiler-label{position:absolute;left:8px;right:8px;bottom:0;text-align:center;color:#a9c7ca;font-size:.74rem}.diag-flow{display:grid;gap:10px}.diag-step{display:grid;grid-template-columns:32px 1fr;gap:11px;align-items:center;padding:12px 13px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.075);border-radius:14px}.diag-step>span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--amber);color:#17272e;font-weight:950}.diag-step strong{display:block;color:#fff;font-size:.95rem}.diag-step small{display:block;color:#9dbec1;margin-top:2px;line-height:1.35}.diag-step.final{background:rgba(121,214,170,.10);border-color:rgba(121,214,170,.18)}.panel-bottom{position:absolute;left:26px;right:26px;bottom:24px;display:flex;justify-content:space-between;align-items:center;color:#9ebec0;font-size:.8rem}.panel-bottom strong{color:#fff}.panel-bottom em{font-style:normal;color:#f5b276}
.trust-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.trust-grid{display:grid;grid-template-columns:repeat(4,1fr)}.trust-grid div{padding:22px 24px;border-right:1px solid var(--line)}.trust-grid div:last-child{border-right:0}.trust-grid strong{display:block}.trust-grid span{display:block;font-size:.82rem;color:var(--muted);margin-top:3px}
.value-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:40px}.value-card,.offer-card,.type-card,.quick-box,.sidebox,.related a{border:1px solid var(--line);border-radius:22px;background:#fff;padding:24px;box-shadow:var(--shadow-sm)}.value-card b{display:grid;place-items:center;width:40px;height:40px;border-radius:13px;background:#fff2e4;color:var(--amber2);margin-bottom:18px}.value-card h3{font-size:1.1rem}.value-card p,.offer-card p,.type-card p{color:var(--muted);margin-top:10px;font-size:.93rem}
.services{background:var(--soft)}.offer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}.offer-card{display:flex;flex-direction:column;padding:28px}.offer-card.featured{background:linear-gradient(155deg,#123c44,#0a2c32);border-color:transparent;color:#fff}.offer-card.featured h3,.offer-card.featured p,.offer-card.featured li{color:#fff}.offer-card.featured p,.offer-card.featured li{opacity:.80}.offer-kicker{font-size:.71rem;text-transform:uppercase;letter-spacing:.12em;color:var(--amber2);font-weight:900;margin-bottom:18px}.offer-card.featured .offer-kicker{color:#f5ad69}.offer-card ul{padding-left:18px;margin:18px 0 24px;color:#597181}.offer-card li{margin:7px 0}.offer-link{margin-top:auto;font-weight:900;color:var(--teal)}.offer-card.featured .offer-link{color:#f5b276}.service-tip{margin-top:20px;padding:18px 22px;border-left:4px solid var(--teal);background:#fff;border-radius:0 14px 14px 0;color:#5b7380}.service-tip strong{color:var(--ink2)}
.symptom-wrap{margin-top:34px;display:flex;flex-wrap:wrap;gap:10px}.symptom{padding:10px 13px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#436070;font-weight:800;font-size:.88rem}.safety-note{margin-top:30px;padding:20px 22px;border-radius:18px;background:#fff4f2;border:1px solid #f0c6c1;color:#6c433e}.safety-note strong{color:#8d2821}.safety-note a{text-decoration:underline;font-weight:900}
.steps{list-style:none;padding:0;margin:42px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.steps li{border-top:1px solid var(--line);padding-top:22px}.steps li>span{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--teal);color:#fff;font-weight:900;margin-bottom:18px}.steps p{color:var(--muted);font-size:.92rem;margin-top:8px}
.types-section{background:linear-gradient(180deg,#fff,#f7fafb)}.types-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:36px}.type-card{padding:22px;box-shadow:none}.type-label{display:inline-block;padding:6px 9px;border-radius:999px;background:#eaf3f4;color:var(--teal2);font-size:.71rem;font-weight:900;text-transform:uppercase;letter-spacing:.07em;margin-bottom:14px}.brand-box{margin-top:24px;padding:25px;border:1px solid var(--line);border-radius:22px;background:#fff}.brand-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.brand-chip{padding:10px 13px;border:1px solid #cddce2;border-radius:999px;background:#f8fbfc;color:#355669;font-weight:900;font-size:.88rem}.brand-note{margin-top:14px;color:var(--muted);font-size:.88rem}.result-panel{margin-top:24px;padding:26px;border-radius:22px;background:linear-gradient(155deg,#123c44,#0a2c32);color:#fff}.result-panel h3{color:#fff}.result-list{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}.result-item{padding:16px;border:1px solid rgba(255,255,255,.1);background:rgba(255,255,255,.06);border-radius:15px}.result-item b{display:block;color:#f4ae6c;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em}.result-item strong{display:block;margin-top:5px}.result-item small{display:block;color:#b5cdcf;margin-top:5px;line-height:1.4}
.accordion{margin-top:34px;border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line)}summary{list-style:none;cursor:pointer;padding:20px 40px 20px 0;font-weight:850;color:var(--ink2);position:relative}summary::-webkit-details-marker{display:none}summary:after{content:"+";position:absolute;right:4px;color:var(--amber2);font-size:1.4rem}details[open] summary:after{content:"−"}details p{color:var(--muted);padding:0 35px 20px 0;margin:0}
.cta{padding:82px 0;background:linear-gradient(145deg,#123c44,#0a2630);color:#fff}.cta-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}.cta h2{color:#fff}.cta p{color:#bdd1d3;margin-top:17px}.request-card{background:#fff;border-radius:24px;padding:26px;color:var(--ink);box-shadow:0 24px 55px rgba(0,0,0,.18)}.request-card h3{font-size:1.16rem}.request-phone{display:block;font-size:1.45rem;font-weight:950;color:var(--ink2);margin:10px 0 3px}.request-actions{display:flex;gap:11px;flex-wrap:wrap;margin-top:18px}
.footer{background:#081c24;color:#8fa7b1;padding:34px 0 18px}.footer-grid{display:grid;grid-template-columns:1.15fr .78fr .78fr 1.35fr;gap:32px}.footer .brand strong{color:#fff}.footer .brand small{color:#8fa7b1}.footer-links{display:flex;flex-direction:column;gap:8px;font-size:.84rem}.footer-links strong{color:#dce8ec;font-size:.76rem;text-transform:uppercase;letter-spacing:.1em}.footer-links a{color:#afc2c9}.footer-company{text-align:right;font-size:.78rem;line-height:1.6;color:#a6b8bf}.footer-company strong,.footer-company span{display:block}.footer-company strong{color:#e2ecef}.footer-company a{text-decoration:underline}.footer-contact{margin-top:5px}.footer-contact a{display:block}.footer-phone{white-space:nowrap}.footer-email{overflow-wrap:anywhere;word-break:normal}.footer-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:24px;padding-top:15px;display:flex;justify-content:space-between;font-size:.71rem;color:#6f8993}
.page-hero{padding:58px 0 52px;background:linear-gradient(180deg,#f7fafb,#fff)}.page-hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:46px;align-items:center}.page-hero h1{font-size:clamp(2.2rem,3.7vw,3.65rem);max-width:710px}.page-hero .lead{margin-top:18px}.breadcrumb{font-size:.8rem;color:#8094a0;margin-bottom:20px}.page-visual{border-radius:27px;background:linear-gradient(155deg,#123c44,#0a2c32);color:#fff;padding:27px;min-height:305px;box-shadow:var(--shadow);position:relative;overflow:hidden}.page-visual:after{content:"";position:absolute;width:220px;height:220px;border-radius:50%;right:-70px;top:-70px;background:radial-gradient(circle,rgba(242,138,47,.18),transparent 68%)}.page-visual h3{color:#fff;font-size:1.17rem;position:relative;z-index:1}.page-visual p{color:#bed2d4;position:relative;z-index:1}.visual-steps{display:grid;gap:10px;margin-top:28px;position:relative;z-index:1}.visual-step{display:grid;grid-template-columns:34px 1fr;gap:11px;align-items:center;padding:12px 13px;border-radius:14px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.08)}.visual-step span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--amber);color:#18272e;font-weight:950}.visual-step strong{color:#fff}.visual-step small{display:block;color:#a9c4c7;margin-top:2px}.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:42px}.content h2{font-size:clamp(1.45rem,2.1vw,2rem);line-height:1.16;margin-top:44px;max-width:760px}.content h2:first-child{margin-top:0}.content h3{font-size:1.12rem;line-height:1.25;margin-top:24px}.content p,.content li{color:#58717f}.content ul{padding-left:22px}.content li{margin:8px 0}.quick-box{background:#f8fbfc;margin:0 0 28px}.quick-box strong{display:block;color:var(--ink2);font-size:1.08rem;margin-bottom:7px}.quick-box p{margin:0}.sidebox{position:sticky;top:100px;background:var(--soft)}.sidebox h3{font-size:1.08rem}.sidebox ul{list-style:none;padding:0;margin:16px 0}.sidebox li{padding:8px 0;border-bottom:1px solid var(--line);font-size:.9rem;color:#5a727f}.sidebox li:last-child{border-bottom:0}.sidebox .btn{width:100%;margin-top:10px}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}.related a{box-shadow:none;padding:18px}.related strong{display:block;color:var(--ink2)}.related span{display:block;color:var(--muted);font-size:.83rem;margin-top:5px}.privacy{padding:70px 0}.privacy h1{font-size:clamp(2.25rem,4vw,3.6rem)}.privacy h2{font-size:1.48rem;margin-top:34px}.privacy p,.privacy li{color:#5b7180}
@media(hover:hover){.value-card:hover,.offer-card:not(.featured):hover,.type-card:hover,.related a:hover{transform:translateY(-2px);border-color:#c8d9df;box-shadow:var(--shadow)}.value-card,.offer-card,.type-card,.related a{transition:.18s ease}}
@media(max-width:980px){.site-header .btn-small{display:none}.main-nav{position:fixed;inset:78px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);padding:18px 20px 24px;display:none;flex-direction:column;align-items:flex-start;gap:13px;box-shadow:var(--shadow-sm)}.main-nav.open{display:flex}.nav-toggle{display:block}.hero-grid,.page-hero-grid,.cta-grid,.content-grid{grid-template-columns:1fr}.value-grid,.types-grid{grid-template-columns:repeat(2,1fr)}.offer-grid{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,1fr)}.trust-grid{grid-template-columns:repeat(2,1fr)}.trust-grid div:nth-child(2){border-right:0}.trust-grid div:nth-child(-n+2){border-bottom:1px solid var(--line)}.footer-grid{grid-template-columns:1fr 1fr}.footer-company{text-align:left}.sidebox{position:static}.result-list{grid-template-columns:1fr 1fr}.related{grid-template-columns:1fr}}
@media(max-width:640px){.shell,.narrow{width:min(100% - 28px,var(--max))}.section{padding:66px 0}.nav-wrap{height:70px}.main-nav{inset:70px 0 auto}.brand small{display:none}.hero{padding:42px 0 52px}.hero h1{font-size:clamp(2.25rem,10.5vw,3.2rem)}.hero-points{grid-template-columns:1fr}.service-panel{min-height:445px;border-radius:25px}.diagnostic-stage{left:16px;right:16px;top:70px;bottom:72px;padding:16px;grid-template-columns:1fr}.boiler-focus{min-height:135px;border-right:0;border-bottom:1px solid rgba(255,255,255,.09)}.boiler-focus svg{width:92px}.boiler-label{font-size:.68rem}.diag-flow{grid-template-columns:1fr}.diag-step{padding:9px 10px}.panel-top{padding:20px 18px;font-size:.65rem}.panel-bottom{left:18px;right:18px;bottom:18px}.trust-grid,.value-grid,.types-grid,.steps,.result-list{grid-template-columns:1fr}.trust-grid div{border-right:0;border-bottom:1px solid var(--line)}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:6px}.request-actions{flex-direction:column}.request-actions .btn{width:100%}.page-hero{padding:44px 0 44px}.page-hero h1{font-size:clamp(2rem,9vw,2.8rem)}.related{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn,.value-card,.offer-card,.type-card,.related a{transition:none!important}}

/* v7.2 brand refresh */
.brand-logo{display:block;width:210px;max-width:42vw;height:auto}.footer .brand-logo{width:218px;max-width:100%}@media(max-width:760px){.brand-logo{width:178px;max-width:55vw}.footer .brand-logo{width:205px;max-width:100%}}