@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#203c35;--green:#256d4e;--muted:#68766f;--paper:#f6f7f2;--line:#dce2d9}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font:15px 'DM Sans',sans-serif}button,input{font:inherit}button,a,input{touch-action:manipulation}a{color:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #d98a32;outline-offset:4px}button:disabled{opacity:.35;cursor:default}.nav{max-width:1360px;margin:auto;padding:25px 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{font-family:Manrope,sans-serif;font-weight:800;font-size:23px;letter-spacing:-1px;text-decoration:none}.brand-icon{display:inline-grid;place-items:center;background:var(--green);color:white;width:33px;height:33px;border-radius:50%;margin-right:7px;font-size:28px}.dot{color:#7b8b7a}.nav 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h2{font-size:35px}.lead{max-width:680px;line-height:1.9;color:var(--muted);font-size:14px}.explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin:36px 0}.article-number{font-size:11px;color:#83a078}h3{font:600 17px Manrope,sans-serif;margin:12px 0}.explain-grid p{font-size:12px;line-height:1.9;color:var(--muted)}.water-note{border-top:1px solid var(--line);padding-top:22px;display:flex;gap:16px}.water-note .icon{color:var(--green);margin-top:4px}.water-note p{font-size:12px;line-height:1.8;margin:0;max-width:940px;color:var(--muted)}.water-note b{color:var(--ink)}.faq{border-top:1px solid var(--line);padding:48px 0 65px;display:grid;grid-template-columns:1fr 2fr;gap:50px}details{border-bottom:1px solid var(--line);padding:18px 0}summary{cursor:pointer;font-size:14px;font-weight:500}details p{font-size:12px;line-height:1.9;color:var(--muted);overflow-wrap:anywhere}code{font-size:11px}footer{border-top:1px solid var(--line);padding:25px 48px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}footer .brand{font-size:18px;color:var(--ink)}footer p{flex:1}.svg-defs{position:absolute;width:0;height:0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.error{color:#b44732;font-size:12px;line-height:1.5}.error:empty{display:none}@media(min-width:1500px){.intro{padding-top:85px}}@media(max-width:950px){.nav{padding:22px 24px}.nav-tag{display:none}.sim-grid{grid-template-columns:1fr 1.15fr;gap:15px}.device-card,.chart-card{padding:16px}.device{padding:16px 10px 8px}.lcd{padding:8px}.panel-table{font-size:16px}.intro-note{right:0}.parameter-list p{font-size:10px}.stepper button{width:27px}.lcd-title{font-size:13px}}@media(max-width:730px){.nav{padding:18px 20px}.brand{font-size:20px}.nav nav{gap:15px;font-size:11px}.nav nav a:last-child{display:none}main{padding:0 18px}.intro{padding:44px 0 35px}.intro-note{display:none}h1{letter-spacing:-1.7px}.intro>p{font-size:14px}.section-top{align-items:start;flex-direction:column}h2{font-size:25px}.sim-grid{grid-template-columns:1fr}.device-card,.chart-card{padding:20px}.device{max-width:470px;margin:18px auto 0;padding:20px 18px 10px}.lcd-title{font-size:18px}.panel-table{font-size:23px}.parameter-list p{font-size:11px}.stepper button{width:36px}.result strong{font-size:32px}.insight{padding:15px;gap:12px}.badge{display:none}.explain h2{font-size:29px}.explain-grid{grid-template-columns:1fr;gap:20px;margin:30px 0}.explain-grid article{border-left:2px solid #d5e0ce;padding-left:18px}.explain-grid h3{margin-top:6px}.explain-grid p{margin-bottom:0}.faq{grid-template-columns:1fr;gap:10px;padding-bottom:40px}footer{padding:24px 20px;flex-wrap:wrap}footer>span{width:100%;font-size:10px}.sim-section{padding-top:28px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Compact introduction: use the available page width and bring the simulator up. */
.intro{padding:24px 0 22px}
.intro h1{font-size:clamp(30px,3vw,42px);line-height:1.2;letter-spacing:-1.4px;margin:12px 0 14px}
.intro h1 br{display:none}
.intro>p{max-width:none;font-size:14px;line-height:1.65;margin:8px 0}
.intro .jump{margin-top:9px;padding:10px 17px}
.intro-note{right:0;bottom:24px}
.sim-section{padding-top:22px}
.sim-section .section-desc{margin:8px 0 18px}
@media(max-width:730px){.intro{padding:23px 0 20px}.intro h1{font-size:32px}.intro>p{font-size:13px;line-height:1.65}.intro-note{display:none}}
.room-section{border-top:1px solid var(--line);margin-top:14px;padding-top:15px}.room-device{max-width:410px;margin:12px auto;background:linear-gradient(135deg,#fafbf7,#dedfd9);border:1px solid #d4d8ce;border-radius:17px;padding:23px 25px 16px;box-shadow:inset 0 2px 3px white,0 5px 12px #213a3210}.room-screen{border:7px solid #232724;border-radius:3px;background:#111817;color:#c5e0ff;font-family:monospace;box-shadow:0 0 0 2px #b7bdb4}.room-bar,.room-screen-footer{background:#56313c;display:flex;justify-content:space-between;padding:4px 7px;font-size:9px}.room-bar span:first-child{background:#a0c7f2;color:#172b3c;padding:0 3px}.room-display{display:flex;gap:14px;align-items:center;padding:17px 10px 13px;min-height:148px}.room-house{width:42%;background:linear-gradient(140deg,#4877b3,#85a5c2);clip-path:polygon(50% 0,100% 30%,100% 100%,0 100%,0 30%);padding:45px 5px 10px;text-align:center;color:#101d25;flex-shrink:0}.room-house>span{font:6px 'DM Sans',sans-serif;display:block;letter-spacing:.3px}.room-house strong{font-size:19px;display:block;margin:5px 0}.room-house .icon{width:20px}.room-target{flex:1;min-width:0}.room-outside{display:block;color:#84cc79;font-size:13px;margin-bottom:15px}.room-target label{display:block;font:7px 'DM Sans',sans-serif;color:#d0e2e6;line-height:1.5}.room-setting{display:flex;align-items:center;gap:3px;font-size:21px;margin-top:6px}.room-setting input{min-width:0;width:4ch;color:#c5e0ff;background:#243d47;border:1px solid #7f9da6;border-radius:3px;padding:6px 1px;font:inherit;text-align:center;appearance:textfield}.room-setting input::-webkit-inner-spin-button{appearance:none}.room-setting input[aria-invalid=true]{border-color:#ff9b7b}.room-adjust{display:flex;flex-direction:column;gap:5px;margin-left:auto}.room-adjust button{width:29px;height:29px;background:#9cc1e5;border:1px solid #4b7494;color:#953442;font-size:23px;line-height:1;padding:0}.room-adjust button+button{color:#244f7f}.room-screen-footer{font-size:7px;align-items:center}.room-screen-footer span{font-size:15px;color:#8bb1d5}.room-keys{display:flex;justify-content:space-between;margin:22px 14px 0;gap:9px}.room-keys span{border:1px solid #bcc1b8;box-shadow:inset 0 2px 2px white,0 1px 3px #0001;border-radius:6px;background:linear-gradient(#f5f6ef,#d9ddd3);color:#919c8f;font-size:17px;display:grid;place-items:center;width:36px;height:33px}.room-status{font-size:12px;line-height:1.7;color:var(--green);margin-bottom:0}.room-goal-summary{margin:15px 0 6px;padding:12px 14px;background:#f0f4ed;border-radius:6px;font-size:12px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:5px}.room-goal-summary strong{color:var(--green);font-size:17px}.room-goal-summary small{width:100%;font-size:10px;color:var(--muted)}.chart-card{align-self:start}@media(max-width:400px){.room-device{padding:18px 13px 12px}.room-display{gap:9px;padding:12px 7px}.room-setting{font-size:19px}.room-house strong{font-size:17px}}
.legend{flex-wrap:wrap;row-gap:9px}.legend .room-dotted{border-top:2px dotted #b87928}
/* Keep all three simulator parts together in a compact workspace. */
.nav{padding-top:12px;padding-bottom:12px}.intro{padding:14px 0}.intro h1{font-size:30px;margin:8px 0}.intro>p{margin:5px 0;font-size:13px;line-height:1.55}.intro .jump{padding:6px 12px;font-size:11px;margin-top:5px}.intro-note{display:none}.sim-section{padding-top:14px;padding-bottom:25px}.sim-section h2{font-size:23px;margin:6px 0}.sim-section .section-desc{margin:4px 0 12px;font-size:12px}.sim-grid{grid-template-columns:minmax(250px,.85fr) minmax(360px,1.4fr) minmax(260px,.85fr);gap:12px;align-items:start}.device-card,.chart-card,.sim-grid>.room-section{padding:14px;border:1px solid var(--line);border-radius:10px;background:white;margin:0;min-width:0}.card-heading{min-height:26px;font-size:9px;letter-spacing:.7px}.device{padding:12px 9px 5px;margin-top:8px;border-radius:10px}.lcd{padding:8px 6px;border-width:3px}.lcd-title{font-size:13px;gap:5px;padding-bottom:5px}.lcd-title .icon{width:19px;height:19px}.panel-table{font-size:17px}.panel-table th,.panel-table td{padding:4px 1px}.panel-table .icon{width:21px;height:21px}.curve-symbol{font-size:23px}.lcd-footer{font-size:7px;margin-top:5px}.device-bottom{padding:8px 3px 2px}.dial{width:40px;height:40px;border-width:3px}.dial span{height:25px;width:6px}.parameter-list{margin-top:8px}.parameter-list>div{padding:8px 0;gap:6px}.parameter-list p{font-size:10px;line-height:1.5}.parameter-list b{font-size:11px}.num{width:19px;height:19px}.stepper button{width:28px;height:32px}.room-device{padding:15px 12px 10px;margin:9px auto}.room-display{padding:10px 6px;gap:8px;min-height:130px}.room-house{width:40%;padding-top:35px}.room-house strong{font-size:16px}.room-setting{font-size:19px}.room-outside{font-size:11px;margin-bottom:10px}.room-adjust button{width:27px;height:29px}.room-keys{margin:16px 4px 0;gap:5px}.room-keys span{width:30px;height:28px;font-size:14px}.room-status{font-size:11px;line-height:1.6}.room-goal-summary{padding:7px 10px;margin-top:7px;font-size:10px}.room-goal-summary strong{font-size:15px}.room-goal-summary small{font-size:9px}.legend{margin-top:10px;gap:10px;font-size:9px;row-gap:5px}#chart{margin:5px 0}.weather{padding:9px 12px}.weather label{font-size:11px}input[type=range]{margin:9px 0 4px}.result{margin-top:10px}.result strong{font-size:27px}.result span{font-size:8px}.result p{font-size:10px;margin:0}.model-note{font-size:9px;margin-top:8px;line-height:1.5}.insight{padding:9px 14px;margin-top:10px}.insight p{font-size:11px}.return-explanation{margin-bottom:30px;line-height:1.8;color:var(--muted);font-size:14px}.return-explanation p:first-child{margin-top:0}
@media(min-width:1100px){main{max-width:1500px}.intro>p{max-width:none}}
@media(min-width:760px) and (max-width:1099px){.sim-grid{grid-template-columns:minmax(240px,.8fr) minmax(350px,1.2fr);gap:10px}.device-card{grid-column:1;grid-row:1}.chart-card{grid-column:2;grid-row:1 / span 2}.sim-grid>.room-section{grid-column:1;grid-row:2}.device-bottom,.parameter-list p br,.parameter-list p:not(b){display:none}.parameter-list{display:flex;gap:6px}.parameter-list>div{flex-wrap:wrap;justify-content:space-between;flex:1;border:0;padding:4px 0}.parameter-list .num{display:none}.room-device{margin:5px auto;padding:8px}.room-display{min-height:105px;padding:5px}.room-keys{display:none}.room-section .model-note{display:none}.room-status{margin-top:5px}.room-house{padding-top:27px}.room-section .card-heading{min-height:20px}}
@media(max-width:759px){.sim-grid{grid-template-columns:1fr}.sim-grid>.room-section{grid-row:2}.chart-card{grid-row:3}.device{max-width:360px}.room-device{max-width:340px}.intro h1{font-size:27px}.section-top{flex-direction:row;align-items:center}.section-top .eyebrow{display:none}.sim-section h2{font-size:18px}.reset{font-size:10px;padding:8px}.sim-section .section-desc{font-size:11px}.room-section .model-note{display:block}}
@media(min-width:1100px){.nav{padding-top:8px;padding-bottom:8px}.intro{padding:8px 0}.intro .eyebrow,.intro .jump{display:none}.intro h1{font-size:25px;margin:4px 0 6px}.intro>p{font-size:12px;margin:0;line-height:1.5}.sim-section{padding-top:10px}.sim-section .section-top .eyebrow{display:none}.sim-section h2{font-size:21px;margin:4px 0}.sim-section .section-desc{margin:3px 0 9px;font-size:11px}.device-bottom{display:none}.device{padding:9px 7px;margin-top:6px}.panel-table{font-size:15px}.panel-table th,.panel-table td{padding:3px 1px}.lcd-title{font-size:12px}.parameter-list>div{padding:6px 0}.parameter-list p{font-size:9px}.parameter-list b{font-size:10px}.room-goal-summary{padding:5px 8px;margin:5px 0}.room-goal-summary small{display:none}.chart-card .legend{font-size:8px;margin-top:7px;gap:7px}.chart-card .weather{padding:7px 10px}.chart-card .result{margin-top:7px}.chart-card .result strong{font-size:24px}.chart-card .model-note{font-size:8px;line-height:1.4;margin-top:6px}.room-device{padding:12px 9px 9px}.room-display{min-height:115px}.room-keys{margin-top:12px}.room-section .model-note{font-size:8px}.room-status{font-size:10px}.insight{padding:6px 12px;margin-top:8px}}
.legend .room-return-legend{border-top:2px dashed #5275c4}.room-return-reading{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px;font-size:11px;color:#4566ad;margin-top:8px}.room-return-reading strong{font-size:15px}.room-return-reading small{width:100%;font-size:9px;line-height:1.4;color:var(--muted)}@media(min-width:1100px){.room-return-reading{font-size:10px;margin-top:5px}.room-return-reading small{font-size:8px}}
.legend .room-return-legend{border-top:3px solid #5275c4}.point-readout{font-size:11px;line-height:1.5;color:#4566ad;margin:6px 0}.curve-point{cursor:pointer;pointer-events:all}.curve-point:hover,.curve-point:focus{fill:#5275c4;stroke:white;stroke-width:2;outline:none}.datapoints{padding:10px 0 20px}.datapoints summary{font-size:12px;color:var(--green)}.data-table-wrap{max-height:290px;overflow:auto;margin-top:10px}.data-table-wrap table{border-collapse:collapse;width:100%;font-size:12px;text-align:left;font-variant-numeric:tabular-nums}.data-table-wrap th,.data-table-wrap td{padding:8px 12px;border-bottom:1px solid var(--line)}.data-table-wrap th{position:sticky;top:0;background:var(--paper)}@media(min-width:1100px){.point-readout{font-size:10px}}
.legend .room-return-legend{border-top:3px dashed #5275c4}
/* Prioritise the plot: full card width, with readable controls on both sides. */
.chart-card #chart{width:100%;height:auto;max-height:none;display:block}
@media(min-width:1100px){main{max-width:1800px;padding-left:20px;padding-right:20px}.sim-grid{grid-template-columns:minmax(250px,.62fr) minmax(520px,1.76fr) minmax(260px,.62fr);gap:14px}.chart-card{padding:12px 16px}.chart-card #chart{margin:8px 0 5px}.chart-card .legend{font-size:10px;gap:14px}.chart-card .room-goal-summary{padding:5px 9px}.chart-card .model-note{font-size:9px}.stepper button{min-width:32px;min-height:36px}.room-adjust button{min-width:30px;min-height:34px}.room-device{padding:12px 9px}.room-setting{font-size:20px}}
@media(min-width:1500px){.sim-grid{grid-template-columns:300px minmax(0,1fr) 310px}.chart-card #chart{max-width:none}}@media(min-width:1100px){.chart-card .room-goal-summary{display:none}.chart-card .result{display:inline-flex;vertical-align:top;margin-top:6px;gap:18px}.chart-card .result p{max-width:240px}.chart-card .point-readout{font-size:10px;line-height:1.35;margin:5px 0 0}.chart-card .card-heading{min-height:22px}.chart-card .weather{padding:5px 10px}.chart-card .weather input{margin-top:6px}.chart-explanation{display:flex;gap:20px}.chart-explanation .model-note{flex:1;font-size:10px;margin:0 0 8px}}
@media(min-width:1100px){.chart-card #chart{max-height:clamp(270px,calc(100vh - 450px),520px)}}
.legend .solid{border:0;height:3px;background:linear-gradient(90deg,#28714f 0 33.3%,#c37a16 33.3% 66.6%,#c33d36 66.6%)}.deviation-key{display:flex;flex-wrap:wrap;gap:8px 20px;padding:4px 0 12px;font-size:11px;color:var(--muted)}.deviation-key span{display:flex;align-items:center;gap:7px}.deviation-key i{width:16px;height:3px;display:block}.key-green{background:#28714f}.key-orange{background:#c37a16}.key-red{background:#c33d36}.deviation-key small{width:100%;font-size:10px}
.legend .ideal-legend{border-top:3px dashed #9156b5}
#heating-curve-line{vector-effect:non-scaling-stroke}.legend .solid{height:5px}
.key-blue{background:#1769bd}
.weather-observation{display:flex;align-items:center;gap:10px;margin-top:5px}.weather-observation p{flex:1;font-size:10px;line-height:1.4;margin:0;color:var(--muted)}.weather-observation button{background:white;border:1px solid var(--line);border-radius:4px;padding:7px 9px;font-size:10px;color:var(--green);flex-shrink:0}.weather-source{display:inline-block;margin-top:4px;font-size:9px;color:var(--muted)}@media(max-width:450px){.weather-observation{align-items:start;flex-direction:column;gap:5px}}