/* HeizKlug v3 — human, editorial, mobile-first */
:root{
  --ink:#121923;--ink-2:#26313d;--muted:#66717d;--paper:#f5f7f8;--white:#fff;
  --line:#e2e7ea;--line-dark:#314150;--orange:#f26522;--orange-dark:#d94d0a;--orange-soft:#fff2eb;
  --navy:#10212d;--navy-2:#18313f;--green:#16835f;--green-soft:#eaf7f1;--warn:#b87914;--warn-soft:#fff8e8;--bad:#b44949;
  --max:1180px;--radius:18px;--radius-lg:28px;--shadow:0 18px 55px rgba(20,38,49,.09);--shadow-sm:0 8px 28px rgba(20,38,49,.07)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.62 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}img{max-width:100%}.wrap{width:min(var(--max),calc(100% - 36px));margin:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;background:#fff;color:#000;padding:10px 14px;border-radius:8px;z-index:999}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(18px);border-bottom:1px solid rgba(18,25,35,.08)}.nav-wrap{min-height:72px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:9px;font-size:23px;font-weight:900;letter-spacing:-.045em;white-space:nowrap}.brand>span:last-child>span{color:var(--orange)}.brand-mark{position:relative;display:grid;place-items:center;width:35px;height:42px;color:#fff;font-size:10px;font-weight:950;background:linear-gradient(145deg,#ff7a2f,var(--orange));border-radius:18px 18px 18px 5px;transform:rotate(7deg);box-shadow:0 6px 18px rgba(242,101,34,.22)}.brand-mark::after{content:"";position:absolute;width:14px;height:19px;background:#fff3ec;border-radius:10px 10px 10px 3px;bottom:6px;left:9px;opacity:.95}.nav{display:flex;gap:26px;margin-left:auto;color:#293540;font-weight:650;font-size:14px}.nav a{padding:8px 0}.nav a:hover{color:var(--orange)}.nav-cta,.btn{display:inline-flex;justify-content:center;align-items:center;border-radius:10px;font-weight:800;transition:.18s;cursor:pointer}.nav-cta{padding:11px 16px;background:var(--orange);color:white;box-shadow:0 7px 20px rgba(242,101,34,.18)}.nav-cta:hover,.btn.primary:hover{background:var(--orange-dark);transform:translateY(-1px)}.menu-btn{display:none;margin-left:auto;background:white;border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:8px 11px}
/* Homepage */
.hero{padding:0;background:var(--white)}.hero-home{position:relative;min-height:560px;display:grid;align-items:center;overflow:hidden;background:linear-gradient(90deg,rgba(10,24,33,.98) 0%,rgba(10,24,33,.91) 43%,rgba(10,24,33,.44) 72%,rgba(10,24,33,.18) 100%),radial-gradient(circle at 82% 18%,rgba(242,101,34,.25),transparent 34%),linear-gradient(145deg,#142b38,#244351)}.hero-home::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:46px 46px;mask-image:linear-gradient(90deg,transparent 30%,black);pointer-events:none}.hero-home-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:70px 0 78px}.hero-copy{color:white}.eyebrow{display:inline-flex;color:var(--orange);font-weight:850;font-size:12px;letter-spacing:.1em;text-transform:uppercase}.hero-home .eyebrow{color:#ffb28d;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);padding:7px 11px;border-radius:999px}.hero h1,.page-hero h1{font-size:clamp(43px,6.7vw,76px);line-height:1.02;letter-spacing:-.052em;margin:16px 0 22px;max-width:850px}.hero-home h1 strong{color:#ff8043;font-weight:900}.hero-copy>p{font-size:19px;max-width:670px;color:#eef3f4;margin:0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0}.btn{padding:13px 18px;border:1px solid var(--line);background:white}.btn.primary{background:var(--orange);color:white;border-color:transparent}.btn.ghost{background:transparent;border-color:#cad2d7;color:var(--ink)}.hero-home .btn.ghost{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.5);color:white}.trust-row{display:flex;flex-wrap:wrap;gap:20px;color:#dfe7e9;font-size:14px}.hero-visual{position:relative;min-height:405px}.house-illustration{position:absolute;inset:0;border-radius:26px;overflow:hidden;box-shadow:0 28px 70px rgba(0,0,0,.28);border:1px solid rgba(255,255,255,.12);background:#213b49}.house-illustration svg{display:block;width:100%;height:100%}.hero-badge{position:absolute;right:-10px;top:25px;background:var(--orange);color:white;border-radius:50%;width:118px;height:118px;display:grid;place-items:center;text-align:center;font-size:13px;font-weight:800;line-height:1.25;border:3px solid rgba(255,255,255,.85);transform:rotate(5deg);box-shadow:0 14px 34px rgba(0,0,0,.2)}
.home-card-strip{position:relative;z-index:4;margin-top:-56px}.home-card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.home-tool-card{background:white;border:1px solid var(--line);border-radius:16px;padding:24px 23px;box-shadow:var(--shadow-sm);transition:.18s}.home-tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#f5c8b3}.tool-icon{width:43px;height:43px;display:grid;place-items:center;color:var(--orange);background:var(--orange-soft);border-radius:12px;font-size:23px;margin-bottom:17px}.home-tool-card h3{font-size:19px;margin:0 0 7px}.home-tool-card p{color:var(--muted);font-size:14px;min-height:47px;margin:0}.home-tool-card .arrow{margin-top:17px}
.home-feature{display:grid;grid-template-columns:1fr 1fr;gap:0;background:white;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:var(--shadow-sm)}.home-feature-copy{padding:44px}.home-feature-copy h2{font-size:clamp(32px,4.3vw,48px);line-height:1.08;letter-spacing:-.04em;margin:10px 0 14px}.home-feature-copy p{color:var(--muted);max-width:600px}.home-feature-list{background:linear-gradient(145deg,#f9fbfc,#eef3f5);padding:42px;display:grid;align-content:center;gap:17px}.check-item{display:flex;gap:14px;align-items:flex-start}.check-dot{flex:0 0 28px;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--green-soft);color:var(--green);font-weight:900}.check-item strong{display:block}.check-item span{display:block;color:var(--muted);font-size:14px}.heatpump-band{position:relative;overflow:hidden;border-radius:24px;background:linear-gradient(115deg,#10212d 0,#162d3a 55%,#234555 100%);color:white;padding:46px}.heatpump-band::after{content:"";position:absolute;right:-90px;bottom:-165px;width:460px;height:460px;border:90px solid rgba(242,101,34,.16);border-radius:50%}.heatpump-band>*{position:relative;z-index:2}.heatpump-band h2{max-width:700px;margin:9px 0 12px;font-size:clamp(32px,4vw,49px)}.heatpump-band p{max-width:670px;color:#ced9de}.benefit-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);background:white;border-radius:18px;overflow:hidden}.benefit{padding:25px;border-right:1px solid var(--line)}.benefit:last-child{border-right:0}.benefit strong{display:block}.benefit p{margin:4px 0 0;color:var(--muted);font-size:13px}
/* Standard page header */
.page-hero{padding:58px 0 38px;background:linear-gradient(180deg,#fff,#f7f9fa);border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(39px,6vw,64px);max-width:900px;color:var(--ink);margin-bottom:16px}.page-hero>div>p{font-size:18px;max-width:760px;color:var(--muted)}.breadcrumbs{font-size:13px;color:#8a939d;margin-bottom:15px}.breadcrumbs a{color:#535f6b}.meta-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.pill{border:1px solid var(--line);background:white;border-radius:999px;padding:6px 10px;color:#63707d;font-size:13px}
/* Ads — visible placeholders until AdSense is configured */
.ad-section{padding:22px 0}.ad-slot{min-height:110px;display:grid;place-items:center;text-align:center;border:1px dashed #c9d0d5;border-radius:13px;color:#929ba2;background:#f9fafb;overflow:hidden}.ad-slot.ad-leaderboard{min-height:118px}.ad-slot.ad-inline{min-height:160px}.ad-slot.ad-sidebar{min-height:260px}.ad-slot span{font-size:10px;letter-spacing:.15em;text-transform:uppercase;color:#a1a8ad}.ad-slot strong{display:block;color:#68727b;font-size:14px}.ad-slot small{display:block;color:#a1a8ad}.ad-note{font-size:11px;color:#a0a7ad;margin-top:6px;text-align:center}.ad-slot ins.adsbygoogle{width:100%;min-height:100px}.ad-label{display:block;font-size:10px;color:#9ca4aa;text-transform:uppercase;letter-spacing:.12em;margin-bottom:6px}
.section{padding:62px 0}.section.alt{background:#fff;border-block:1px solid var(--line)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:28px}.section h2{font-size:clamp(30px,4vw,47px);line-height:1.08;letter-spacing:-.035em;margin:10px 0}.section-head p{max-width:650px;color:var(--muted)}.feature-grid,.card-grid,.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature,.link-card,.article-card{display:block;background:white;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 3px 16px rgba(15,33,45,.035);transition:.18s}.feature:hover,.link-card:hover,.article-card:hover{transform:translateY(-2px);border-color:#f2baa0;box-shadow:var(--shadow-sm)}.feature h3,.link-card h3,.article-card h3{margin:5px 0 8px;font-size:19px}.feature p,.link-card p,.article-card p{margin:0;color:var(--muted);font-size:14px}.tag{display:inline-flex;color:var(--orange);font-size:11px;font-weight:850;text-transform:uppercase;letter-spacing:.07em}.arrow{margin-top:16px;color:var(--orange);font-weight:800}
/* Calculators */
.calc-shell{display:grid;grid-template-columns:minmax(0,1.14fr) minmax(270px,.54fr);gap:24px;align-items:start;padding:38px 0 64px}.calc-card{background:white;border:1px solid var(--line);border-radius:22px;padding:27px;box-shadow:var(--shadow-sm)}.calc-card h2{margin:0 0 4px;font-size:27px}.calc-card>p{color:var(--muted);margin-top:4px}.calc-form{display:grid;gap:15px;margin-top:22px}.calc-form label{display:grid;gap:7px;color:var(--ink-2);font-weight:720;font-size:14px}.calc-form label span{font-weight:500;color:#8a949d}.calc-form input,.calc-form select{width:100%;background:#fbfcfc;color:var(--ink);border:1px solid #d9dfe3;border-radius:10px;padding:12px 13px;outline:none}.calc-form input:focus,.calc-form select:focus{border-color:var(--orange);box-shadow:0 0 0 3px rgba(242,101,34,.09)}.calc-form button,.secondary-btn{cursor:pointer;border:0;border-radius:10px;padding:13px 16px;font-weight:850}.calc-form>button:not(.secondary-btn){background:var(--orange);color:white;margin-top:4px}.secondary-btn{background:#edf1f3!important;color:#34414c!important;border:1px solid #d6dde1!important}.two-cols,.three-cols{display:grid;gap:10px}.two-cols{grid-template-columns:1fr 1fr}.three-cols{grid-template-columns:repeat(3,1fr)}.result{display:none;margin-top:18px;padding:20px;border-radius:14px;background:var(--green-soft);border:1px solid #bde0d2}.result.show{display:block}.result.warn{background:var(--warn-soft);border-color:#ecd8ac}.result.bad{background:#fff0f0;border-color:#e8c1c1}.result>strong{display:block;font-size:27px;letter-spacing:-.025em;color:#0f5e45}.result small{display:block;color:#63756d;margin-top:7px}.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:13px}.metric{padding:11px;border-radius:10px;background:rgba(255,255,255,.65);border:1px solid rgba(22,131,95,.08)}.metric b,.metric span{display:block}.metric span{color:#708078;font-size:11px;margin-top:2px}.calc-card details{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.calc-card summary{cursor:pointer;font-weight:800}.calc-card details p{color:var(--muted)}.side-stack{display:grid;gap:16px}.side-box{background:white;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:0 2px 14px rgba(15,33,45,.03)}.side-box h3{margin:0 0 8px}.side-box p,.side-box li{color:var(--muted);font-size:14px}.side-box ul{padding-left:18px}.side-box a{color:var(--orange);font-weight:750}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f5f7f8;border:1px solid var(--line);border-radius:10px;padding:12px;overflow:auto;color:#3d4b55}.layer-head,.layer-row{display:grid;grid-template-columns:1.35fr .7fr .7fr 38px;gap:8px;align-items:center}.layer-head{font-size:11px;color:#83909a;padding:0 3px}.layer-row input{min-width:0}.layer-remove{background:#fff1f1!important;color:#ad4f4f!important;padding:10px!important;margin:0!important}
/* Editorial */
.content-wrap{display:grid;grid-template-columns:minmax(0,760px) minmax(250px,1fr);gap:50px;align-items:start}.prose{font-size:17px}.prose h2{font-size:32px;margin:44px 0 12px;letter-spacing:-.025em}.prose h3{font-size:22px;margin:30px 0 8px}.prose p,.prose li{color:#3e4a55}.prose a{color:var(--orange-dark);text-decoration:underline;text-underline-offset:3px}.prose table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px;background:white}.prose th,.prose td{border:1px solid var(--line);padding:11px;text-align:left}.prose th{background:#f2f5f6}.callout{border-left:3px solid var(--orange);background:var(--orange-soft);padding:16px 18px;border-radius:0 12px 12px 0;margin:22px 0}.toc{position:sticky;top:95px;background:white;border:1px solid var(--line);padding:18px;border-radius:14px}.toc a{display:block;color:#65717c;padding:6px 0;font-size:14px}.toc a:hover{color:var(--orange)}.notice{border:1px solid #e3d3ad;background:#fff9eb;border-radius:14px;padding:18px}.notice strong{color:#8c5d10}.legal-placeholder{border:1px dashed #d8a8a0;background:#fff4f2;border-radius:14px;padding:16px;color:#8f4a42}.legal-placeholder code{color:#4a2622}.cta-band{padding:35px 0}.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:25px;background:var(--navy);color:white;border-radius:22px;padding:29px}.cta-inner h2{margin:0 0 8px;font-size:30px}.cta-inner p{margin:0;color:#c9d5da}
footer{border-top:1px solid rgba(255,255,255,.07);padding:48px 0 24px;background:#10212d;color:white}.footer-grid{display:grid;grid-template-columns:1.2fr .7fr .7fr;gap:35px}.footer-grid p{color:#aab7be;font-size:14px}.footer-grid strong{display:block;margin-bottom:8px}.footer-grid a:not(.brand){display:block;color:#b7c2c8;margin:6px 0;font-size:14px}.footer-grid a:hover{color:white}.copyright{border-top:1px solid rgba(255,255,255,.09);margin-top:28px;padding-top:18px;color:#81919a;font-size:12px}
.search-box{max-width:420px;width:100%}.search-box input{width:100%;background:white;color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:12px}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.filter{background:white;color:#47545f;border:1px solid var(--line);border-radius:999px;padding:8px 12px;cursor:pointer}.filter.active{background:var(--orange);border-color:var(--orange);color:white;font-weight:800}.empty-state{display:none;border:1px dashed var(--line);padding:30px;text-align:center;border-radius:16px;color:var(--muted)}
@media(max-width:960px){.nav{display:none}.menu-btn{display:block}.nav-cta{display:none}.nav.open{display:flex;position:absolute;top:72px;left:18px;right:18px;flex-direction:column;background:white;border:1px solid var(--line);border-radius:15px;padding:16px;box-shadow:var(--shadow)}.hero-home-grid,.calc-shell,.content-wrap,.home-feature{grid-template-columns:1fr}.hero-home-grid{padding-top:52px}.hero-visual{min-height:340px}.home-card-grid{grid-template-columns:repeat(2,1fr)}.home-card-strip{margin-top:-34px}.feature-grid,.card-grid,.article-grid{grid-template-columns:repeat(2,1fr)}.benefit-grid{grid-template-columns:repeat(2,1fr)}.benefit:nth-child(2){border-right:0}.benefit:nth-child(-n+2){border-bottom:1px solid var(--line)}.toc{position:static}.footer-grid{grid-template-columns:1fr 1fr}.cta-inner{align-items:flex-start;flex-direction:column}}
@media(max-width:620px){.wrap{width:min(var(--max),calc(100% - 24px))}.hero-home-grid{padding:40px 0 66px}.hero h1,.page-hero h1{font-size:43px}.hero-copy>p,.page-hero>div>p{font-size:16px}.hero-visual{min-height:265px}.hero-badge{width:90px;height:90px;font-size:11px;right:2px;top:12px}.home-card-strip{margin-top:-35px}.home-card-grid,.feature-grid,.card-grid,.article-grid,.footer-grid,.benefit-grid{grid-template-columns:1fr}.benefit{border-right:0;border-bottom:1px solid var(--line)}.benefit:last-child{border-bottom:0}.two-cols,.three-cols{grid-template-columns:1fr}.result-grid{grid-template-columns:1fr}.layer-head{display:none}.layer-row{grid-template-columns:1fr 1fr 38px}.layer-row input:first-child{grid-column:1/-1}.section{padding:45px 0}.calc-card{padding:19px}.section-head{align-items:flex-start;flex-direction:column}.cta-inner,.heatpump-band{padding:24px}.home-feature-copy,.home-feature-list{padding:28px}.ad-slot.ad-sidebar{min-height:160px}}

/* Production ad zones */
.ad-slot{min-height:90px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.ad-slot .ad-label-only{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:#7b8790;opacity:.8}
@media (max-width:700px){.ad-slot{min-height:70px}}