.heater-page{--hc-green:#293d34;--hc-ink:#171916;--hc-muted:#5d625a;--hc-line:#d4d5cb;color:var(--hc-ink);background:#f8f6f1}
.heater-page [hidden]{display:none!important}
.heater-shell{width:min(1280px,calc(100% - 80px));margin-inline:auto}
.heater-workspace{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(300px,.8fr);gap:clamp(30px,5vw,80px);padding-block:72px;align-items:start;scroll-margin-top:120px}
.heater-page h2{font-size:clamp(2rem,3.2vw,3.5rem);line-height:1.06;letter-spacing:-.045em;font-weight:500;margin:0 0 24px}
.heater-page h3{font-size:1.25rem;letter-spacing:-.025em;font-weight:600}
.heater-page p{line-height:1.65}
.heater-form fieldset{border:0;padding:0;margin:0 0 32px;min-width:0}
.heater-form legend{width:100%;font-size:1.15rem;font-weight:650;border-top:1px solid var(--hc-line);padding:22px 0 12px}
.heater-page label{display:grid;gap:8px;margin-bottom:18px;font-size:.86rem;font-weight:650}
.heater-page input,.heater-page select{width:100%;min-width:0;min-height:50px;padding:12px 14px;color:var(--hc-ink);background:#fff;border:1px solid #aeb4a9;border-radius:0;font:inherit;font-weight:400;font-size:1rem;box-sizing:border-box}
.heater-page input[aria-invalid=true]{border:2px solid #923726}
.heater-page :is(input,select,button,a,summary):focus-visible{outline:3px solid #48745b;outline-offset:4px}
.heater-dimensions{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.heater-help{color:var(--hc-muted);font-size:.85rem;margin:0 0 22px}
.heater-form .button{width:100%;justify-content:space-between;background:var(--hc-ink);color:#fff;border:0;min-height:54px;cursor:pointer}
.heater-error{color:#882e20;background:#f8e9df;padding:16px}
.heater-result{background:var(--hc-green);color:white;padding:clamp(24px,3vw,42px);position:sticky;top:110px;scroll-margin-top:110px}
.heater-result h2{color:white;font-size:clamp(2rem,2.8vw,3rem)}
.heater-result p{color:#e0e7e1;font-size:.94rem}
.heater-result .eyebrow{font-size:.68rem;letter-spacing:.17em}
.heater-result dl{margin:24px 0}
.heater-result dl div{padding:14px 0;border-top:1px solid #637569;display:flex;justify-content:space-between;gap:16px;align-items:baseline}
.heater-result dt{font-size:.84rem;color:#e0e7e1}
.heater-result dd{margin:0;font-size:1.35rem;white-space:nowrap}
.heater-result .button{display:flex;background:#fff;color:#171916;text-align:center;justify-content:center;white-space:normal;padding:15px;min-height:50px}
.heater-result .heater-result-note{font-size:.79rem;color:#e0e7e1}
.heater-models{padding-bottom:80px;scroll-margin-top:110px}
.heater-section-head{display:flex;justify-content:space-between;align-items:end;gap:24px}
.heater-section-head label{min-width:190px}
.heater-model-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.heater-model{padding:26px;border:1px solid var(--hc-line);display:flex;flex-direction:column;align-items:start;min-width:0;background:#fffdf9}
.heater-model .eyebrow{font-size:.7rem;color:var(--hc-muted);margin:0 0 12px}
.heater-model h3{margin:0 0 14px;font-size:1.6rem}
.heater-model__power{font-size:2rem;letter-spacing:-.04em}
.heater-model p{font-size:.84rem;color:var(--hc-muted);margin:12px 0 18px}
.heater-model .heater-warning{color:#765022;border-left:2px solid #a88654;padding-left:10px;font-size:.8rem}
.heater-model a{font-size:.85rem;color:var(--hc-green);text-underline-offset:5px;min-height:36px;display:inline-flex;align-items:center}
.heater-model a:first-of-type{margin-top:auto;font-weight:650}
.heater-method{background:#eeebe2;padding-block:72px}
.heater-method h2{max-width:780px}
.heater-method-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px 60px;margin-top:38px}
.heater-method-grid>div{border-top:1px solid var(--hc-line);padding-top:20px}
.heater-method-grid p,.heater-sources{font-size:.9rem;color:var(--hc-muted)}
.heater-sources{margin-top:30px;border-top:1px solid var(--hc-line);padding-top:22px}
.heater-sources summary{cursor:pointer;font-weight:650;color:var(--hc-ink)}
.heater-sources li{margin-top:10px}
@media(max-width:1000px){.heater-shell{width:calc(100% - 48px)}.heater-workspace{gap:28px;grid-template-columns:minmax(0,1fr) minmax(280px,.8fr)}.heater-model-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.heater-shell{width:calc(100% - 40px)}.heater-workspace{display:block;padding-block:40px}.heater-result{position:static;margin-top:30px}.heater-section-head{display:block}.heater-section-head label{max-width:100%}.heater-model-grid,.heater-method-grid{grid-template-columns:1fr}.heater-method{padding-block:44px}.heater-models{padding-bottom:44px}.heater-model{padding:22px}.heater-dimensions{gap:12px}}