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.survey-step{border:0;border-bottom:1px solid #d9d9cf;padding:0 0 30px;margin:0 0 32px;min-width:0}.survey-step legend{font-size:20px;font-weight:700;margin-bottom:22px;line-height:1.5}.survey-step legend b{background:#ffdc23;padding:8px;margin-right:10px;font-size:15px}.survey-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}.survey-step label,.survey-grid label{display:flex;flex-direction:column;gap:7px;font-size:13px}.survey-step input:not([type=checkbox]),.survey-step select,.survey-grid select,.survey-grid input{width:100%;min-width:0;padding:12px;border:1px solid #c9c9bf;background:white;border-radius:0;font:inherit;min-height:46px}.survey-step .checkline{display:flex;flex-direction:row;align-items:flex-start;gap:10px;line-height:1.6;margin:18px 0}.checkline input,.device-toggle input{accent-color:#171918;width:20px;height:20px;flex-shrink:0}.device-item{border:1px solid #d4d4c9;margin:10px 0;background:#fff}.survey-step .device-toggle{display:flex;flex-direction:row;align-items:center;gap:12px;padding:17px;cursor:pointer;font-size:15px;font-weight:600}.device-plus{margin-left:auto}.device-item:has(.device-check:checked){border-color:#171918}.device-item:has(.device-check:checked) .device-toggle{background:#ffdc23}.device-fields{padding:0 18px 20px}.device-fields details{font-size:13px}.device-fields summary{cursor:pointer;padding:10px 0}.calc-result{align-self:start;position:sticky;top:105px}.result-devices{font-size:13px;margin-top:20px;line-height:1.8}.result-devices summary{cursor:pointer}.device-fields[hidden],#solar-fields[hidden],.phase-label[hidden]{display:none!important}.survey-grid label{min-width:0}#calc-error:empty{display:none}#calc-error{color:#a12a16;font-weight:600}.calc-result .result-number{font-size:clamp(42px,5vw,72px)}
@media(max-width:700px){.survey-grid{grid-template-columns:1fr}.calc-result{position:static}.survey-step legend{font-size:17px}.survey-step .device-toggle{font-size:14px;padding:15px}.device-fields{padding:0 15px 15px}}

.card-link{display:flex;flex-direction:column;flex:1;min-width:0}.card-link .card-copy{flex:1}.product-actions{display:flex;gap:0;border-top:1px solid var(--line);margin-top:auto}.product-actions button{flex:1;background:transparent;border:0;padding:14px 8px;color:#414937;font-size:11px;min-height:44px}.product-actions button+button{border-left:1px solid var(--line)}.product-actions button[aria-pressed=true]{background:#ffda2c;color:#171918}.product-actions button:hover{background:#ecefe4}.product-info>.product-actions{margin-top:25px;max-width:440px;border:1px solid var(--line);background:#fff}.series-actions{margin-top:18px;border:1px solid var(--line)}.series-actions .product-actions{flex-direction:column}.series-actions button+button{border-left:0;border-top:1px solid var(--line)}.selection-tray{position:fixed;right:20px;bottom:20px;z-index:30;display:flex;background:#171918;color:white;box-shadow:0 5px 25px #0003;border:1px solid #707564;border-radius:6px;overflow:hidden}.selection-tray button{background:none;color:inherit;border:0;padding:15px;font-size:12px}.selection-tray button+button{border-left:1px solid #ffffff30}.selection-tray b{background:#ffda2c;color:#171918;border-radius:20px;padding:3px 7px;margin-left:5px}.site-toast{position:fixed;bottom:90px;right:20px;max-width:360px;padding:17px;background:#171918;color:white;z-index:100;box-shadow:0 4px 20px #0003;font-size:13px;line-height:1.7;opacity:0;pointer-events:none;transition:opacity .2s}.site-toast.show{opacity:1}.selection-dialog{border:0;padding:28px;width:min(1100px,94vw);max-height:88vh;background:#f4f4ee;color:#171918;box-shadow:0 20px 80px #0005}.selection-dialog::backdrop{background:#101510aa;backdrop-filter:blur(3px)}.selection-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:20px}.selection-heading h2{font-size:27px;margin:0;line-height:1.5}.selection-heading button,.saved-item>button{border:0;background:none;font-size:30px;min-width:44px;min-height:44px}.selection-note{font-size:12px;line-height:1.8;color:#66725a}.selection-empty{text-align:center;padding:40px 15px}.selection-empty>span{font-size:55px;color:#a28300}.selection-empty p{line-height:1.8;color:#66725a}.saved-items{display:grid;grid-template-columns:1fr 1fr;gap:15px}.saved-item{display:grid;grid-template-columns:85px 1fr 35px;gap:12px;background:white;border:1px solid var(--line);padding:15px;align-items:start}.saved-item img{width:85px;height:110px;object-fit:contain}.saved-item a{font-weight:bold;font-size:15px;line-height:1.7}.saved-item p{font-size:11px;color:#697065;line-height:1.7}.saved-item .product-actions{flex-wrap:wrap}.inquiry{margin-top:30px;border-top:1px solid var(--line);padding-top:25px}.inquiry p,.inquiry label{font-size:12px;line-height:1.8}.inquiry textarea{display:block;width:100%;padding:15px;resize:vertical;min-height:150px;background:white;border:1px solid #bfc6b3;font:13px/1.8 Arial;margin:10px 0 15px}.inquiry-actions{display:flex;gap:10px;flex-wrap:wrap}.comparison-scroll{overflow-x:auto}.comparison-table{table-layout:fixed;min-width:580px}.comparison-table th,.comparison-table td{width:25%;min-width:140px;vertical-align:top;overflow-wrap:anywhere}.comparison-table thead th{background:#fff}.comparison-table thead th:first-child{background:#e8eddf}.comparison-table thead img{display:block;width:100%;height:180px;object-fit:contain;margin:15px 0}.comparison-table thead a{font-size:16px;line-height:1.6}.comparison-table .compare-remove{border:0;background:none;text-decoration:underline;font-size:11px;min-height:35px;padding:5px}.catalog-tools{display:flex;align-items:center;gap:25px;margin-top:20px;flex-wrap:wrap;font-size:12px}.catalog-tools>label{display:flex;align-items:center;gap:10px}.catalog-tools select{padding:10px;background:white;border:1px solid var(--line);max-width:270px;font-size:12px}.catalog-tools input{accent-color:#171918;width:18px;height:18px}.catalog-tools>button{margin-left:auto;border:0;background:none;text-decoration:underline;min-height:44px;color:#5e6753;font-size:12px}.result-copy{background:transparent!important;color:var(--yellow)!important;border:1px solid #ffffff40!important}.selection-tray~.site-toast{bottom:90px}body{padding-bottom:65px}
@media(max-width:760px){.premium-card{display:flex}.premium-card .card-link{display:grid;grid-template-columns:.85fr 1fr}.premium-card>.product-actions{margin-top:0}.grid .product-actions{flex-direction:column}.grid .product-actions button+button{border-left:0;border-top:1px solid var(--line)}.selection-tray{bottom:10px;right:10px;left:10px;justify-content:center}.selection-tray button{flex:1;font-size:12px;padding:14px 8px}.selection-dialog{padding:18px;width:96vw;max-height:90vh}.selection-heading h2{font-size:20px}.saved-items{grid-template-columns:1fr}.saved-item{grid-template-columns:60px 1fr 30px;padding:12px;gap:10px}.saved-item img{width:60px;height:90px}.saved-item a{font-size:13px}.catalog-tools{gap:12px}.catalog-tools>label:first-child{width:100%}.catalog-tools select{flex:1;max-width:none}.catalog-tools>button{font-size:10px}.site-toast{left:15px;right:15px;max-width:none}.comparison-table thead img{height:130px}.inquiry-actions .button{font-size:11px;padding:14px}.comparison-table thead a{font-size:13px}}

.compare-hint{display:none}@media(max-width:760px){.compare-hint{display:block;font-size:11px;color:#66725a;line-height:1.8}}

header nav{align-items:center}.catalog-nav{position:relative}#catalog-toggle{font:inherit;color:inherit;background:none;border:0;padding:15px 0;display:flex;align-items:center;gap:8px}#catalog-toggle[aria-expanded=true]{color:#827000}#catalog-toggle[aria-expanded=true]>span{transform:rotate(180deg)}.catalog-submenu{position:absolute;right:0;top:100%;width:620px;background:white;border:1px solid #dadfd1;border-top:3px solid #ffda2c;box-shadow:0 18px 45px #0002;padding:22px;z-index:25}.catalog-all{display:flex;justify-content:space-between;align-items:center;padding:8px 8px 18px;font-size:15px;font-weight:700;border-bottom:1px solid var(--line);margin-bottom:10px}.catalog-subgrid{display:grid;grid-template-columns:1fr 1fr;gap:3px 12px}.catalog-subgrid a{display:flex;flex-direction:column;gap:7px;padding:15px 10px}.catalog-subgrid a:hover,.catalog-subgrid a:focus-visible{background:#fff5bd}.catalog-subgrid strong{font-size:13px;font-weight:600;line-height:1.5}.catalog-subgrid a>span{font-size:10px;color:#747d68;line-height:1.6}.catalog-nav:has(#catalog-toggle:focus-visible){outline:2px solid #8e7a0a;outline-offset:5px}
@media(max-width:760px){header nav{align-items:stretch;max-height:calc(100dvh - 145px);overflow-y:auto;gap:8px}header nav>a{padding:12px 0}.catalog-nav{width:100%}#catalog-toggle{width:100%;justify-content:space-between;padding:12px 0}.catalog-submenu{position:static;width:100%;padding:12px;box-shadow:none;border:1px solid var(--line);border-top:3px solid #ffda2c;margin-top:8px}.catalog-subgrid{grid-template-columns:1fr;gap:0}.catalog-subgrid a{padding:12px 6px}.catalog-all{font-size:13px}.catalog-subgrid strong{font-size:13px}.catalog-subgrid a>span{font-size:11px}}

.quote-dialog{border:0;padding:30px;width:min(900px,94vw);max-height:90dvh;background:#f4f4ee;color:#171918;box-shadow:0 20px 80px #0005}.quote-dialog::backdrop{background:#101510aa;backdrop-filter:blur(3px)}.quote-heading{display:flex;justify-content:space-between;align-items:start;gap:15px;border-bottom:1px solid #d7dbce;padding-bottom:20px}.quote-heading h2{font-size:28px;line-height:1.5;margin:8px 0}.quote-heading>button{border:0;background:none;font-size:30px;min-width:44px;min-height:44px}.quote-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:30px;padding-top:24px}.quote-layout aside p{font-size:14px;line-height:1.8}.quote-layout .quote-model{font-size:22px;font-weight:bold;overflow-wrap:anywhere}.quote-layout address{font-style:normal;font-size:14px;line-height:1.8;margin-top:24px}.quote-layout aside .button{font-size:12px;padding:15px}.quote-layout form{display:grid;gap:14px;min-width:0}.quote-layout label{font-size:12px;line-height:1.7;display:block}.quote-layout label>span{color:#6e7464}.quote-layout input:not([type=checkbox]),.quote-layout textarea{display:block;width:100%;padding:12px;background:#fff;border:1px solid #bfc6b3;font:inherit;min-width:0}.quote-layout textarea{resize:vertical}.quote-layout .quote-consent{display:flex;align-items:start;gap:10px;font-size:11px}.quote-consent input{width:18px;height:18px;flex-shrink:0;accent-color:#171918}.quote-status{font-size:13px;line-height:1.8;overflow-wrap:anywhere;margin:0}.quote-trap{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}.quote-dialog button:disabled{opacity:.55;cursor:wait}.product-top>*{min-width:0}.fact-grid>div{overflow-wrap:anywhere}@media(max-width:760px){.quote-dialog{padding:20px}.quote-layout{grid-template-columns:1fr;gap:20px}.quote-heading h2{font-size:22px}.quote-layout aside p{font-size:12px}.quote-layout address{margin-top:15px}}

/* Calculator validation after the first submit attempt. */
#survey .connection-label[hidden]{display:none!important}
#survey .field-invalid input,#survey .field-invalid select{border:2px solid #bc2632;background:#fff3f3;box-shadow:0 0 0 1px #bc26321a}
#survey .field-invalid{color:#a51d2a}
#survey .field-error{display:block;color:#a51d2a;font-size:12px;line-height:1.6;font-weight:500}
#survey .group-invalid{outline:2px solid #bc2632;outline-offset:5px;border-radius:2px}
#survey .device-error{padding:8px 0}

/* BigVolt editorial refinement: light surfaces, graphite and warm gold. */
:root{--paper:#f7f7f2;--ink:#181b19;--muted:#626b62;--line:#e0e3db}
body{font-family:'Segoe UI',Arial,sans-serif;padding-bottom:0}h1,h2,h3,.result-number{letter-spacing:0}h1{font-size:clamp(34px,3.8vw,62px);line-height:1.35}h2,h3{line-height:1.45}
header{box-shadow:0 4px 24px #15201306;background:#fffffff5}header nav>a{transition:color .2s}header nav>a:hover{color:#8a6b00}
.hero{background:radial-gradient(ellipse at 12% 0%,#3a4034 0,transparent 55%),#171b18;min-height:690px;position:relative}.intro{padding-top:72px;padding-bottom:64px}.intro h1 span{color:#ffda2c;font-weight:650}.intro .lead{font-size:16px;color:#cbd1c7}.intro .eyebrow{border:1px solid #ffda2c55;border-radius:30px;padding:8px 14px;letter-spacing:1px}.hero-visual{margin:36px 36px 36px 0;border-radius:160px 24px 24px 24px;background:radial-gradient(ellipse at 60% 30%,#fffef7,#e9e9df 70%);border:1px solid #ffffff80;box-shadow:0 25px 80px #0003}.hero-visual>img{filter:drop-shadow(12px 20px 13px #0002);height:470px;transition:transform .5s}.hero-visual:hover>img{transform:translateY(-6px)}.visual-caption{font-weight:600}.brand-strip{padding-top:20px;padding-bottom:20px;line-height:1.6}
.button{border-radius:8px;min-height:48px;line-height:1.6}.yellow{box-shadow:0 5px 18px #ffda2c15}.button:focus-visible,button:focus-visible,a:focus-visible{outline:3px solid #a58200}.section{padding-top:94px;padding-bottom:94px}.section-heading{gap:32px}.section-heading h2{line-height:1.4}.section-heading p:not(.eyebrow){font-size:14px}
.premium-section{background:linear-gradient(135deg,#202620,#111512);color:#fff;border-top:1px solid #ffffff16}.premium-section .section-heading .eyebrow{color:#e9cc57}.premium-section .section-heading p:not(.eyebrow){color:#bfc7b8}.premium-card{color:var(--ink);border:1px solid #f0e5ac55;border-radius:16px;overflow:hidden;background:#fbfbf7}.premium-card .photo{background:radial-gradient(ellipse at center,#fff,#eeeee3);height:330px;padding:30px}.premium-card .card-copy{padding:28px}.premium-card .tag b{border-radius:20px;background:#fff2ae;color:#6c5400}.premium-card .input-range{font-size:22px;line-height:1.65}.premium-card .card-link{min-width:0}.premium-card:hover{box-shadow:0 20px 45px #0004;transform:translateY(-6px)}.premium-card .product-actions{background:#f2f2e8}
.series{border-radius:16px;overflow:hidden;border:1px solid var(--line);box-shadow:0 8px 28px #18201805}.series-copy select{width:100%;max-width:100%;font-size:13px;line-height:1.5;padding:13px;border-radius:7px;border:1px solid #cbd1c4;background:white}.series-copy h3{font-size:36px}.series-copy .button{margin-top:16px}.series-copy{min-width:0}.series-note{line-height:1.6}.range-banner{border-radius:12px}.additional-model{border-radius:12px}.series-actions{border-radius:7px;overflow:hidden}
.selection-guide{background:#eaece3;border-block:1px solid #dfe2d6}.selection-guide h2{font-size:clamp(27px,3vw,42px);margin:0}.selection-guide ol{list-style:none;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:38px;margin:40px 0}.selection-guide li{border-top:1px solid #bcc5b1;padding-top:22px}.selection-guide li>span{font-size:15px;color:#847024;font-weight:700}.selection-guide h3{font-size:19px;margin:17px 0 12px}.selection-guide li p{font-size:14px;line-height:1.9;color:#626b5c}
.calc-input{border-radius:16px;box-shadow:0 12px 42px #18201806}.calc-result{border-radius:16px;background:radial-gradient(ellipse at 100% 0,#3a402e,transparent 70%),#181d18;box-shadow:0 18px 45px #18201820}.survey-step legend b{border-radius:7px}.survey-step legend{line-height:1.7}.device-item{border-radius:10px;overflow:hidden}.survey-grid input,.survey-grid select,.survey-step select,.survey-step input:not([type=checkbox]){border-radius:7px}.device-item:has(.device-check:checked) .device-plus{font-size:0}.device-item:has(.device-check:checked) .device-plus:after{content:'✓';font-size:20px}.recommend{border-radius:9px}.calc-result .result-number{line-height:1.3}.calc-result dl>div{line-height:1.7}.calc-result dd{text-align:right}
.catalog{background:#f0f2eb}.search,.category-select select,.catalog-tools select{border-radius:8px}.search{min-height:54px}.card:not(.premium-card){border-radius:12px;overflow:hidden}.grid .photo{background:white}.grid h3{line-height:1.65;overflow-wrap:anywhere}.card-bottom{line-height:1.7}.card .product-actions button{min-height:44px}.catalog-tools{font-size:13px}.catalog-submenu{border-radius:0 0 14px 14px}.catalog-subgrid a{border-radius:7px}
.product-top{gap:46px}.product-main-image{border-radius:16px;border:1px solid var(--line)}.product-info h1{line-height:1.45}.fact-grid{border-radius:10px;overflow:hidden}.fact-grid strong{font-size:17px;line-height:1.7;overflow-wrap:normal;word-break:normal}.technical-section{max-width:1120px;margin:45px auto}.technical-section .table-wrap{border-radius:10px}td,th{overflow-wrap:anywhere;line-height:1.9}th{background:#e9ede0}.technical-section tr:nth-child(even){background:#fafbf6}.product-tabs{display:flex!important;position:static!important;margin:40px 0 24px;padding:0;background:transparent;border:0;flex-direction:row;flex-wrap:wrap;gap:10px;max-height:none;overflow:visible}.product-tabs a{background:#fff;border-radius:7px;min-height:44px;line-height:1.6}.technical-gallery a,.document-link{border-radius:10px}.contact{background:radial-gradient(ellipse at 0 100%,#39412f,transparent 65%),#171c18}.contact h2{line-height:1.45}.selection-tray{bottom:16px;right:16px;border-radius:12px}.selection-dialog,.quote-dialog{border-radius:16px}.technical-status{line-height:1.9}
@media(min-width:1101px){.series{grid-template-columns:.9fr 1.1fr}.series-photo{min-height:460px}.series-copy{padding:30px}.intro{max-width:760px}.hero-actions{flex-direction:row;align-items:center;flex-wrap:wrap}.hero-actions .subtle{line-height:1.8}.section,.contact{padding-inline:max(5vw,calc((100vw - 1440px)/2))}}
@media(max-width:760px){h1{font-size:clamp(32px,7.4vw,46px)}.hero{min-height:0}.intro{padding:42px 24px 28px}.hero-visual{margin:0 20px 24px;padding:30px 30px 72px;min-height:370px;border-radius:85px 18px 18px 18px}.hero-visual>img{height:300px}.intro .lead{font-size:14px}.hero-spec{margin-top:26px;padding-top:20px}.section{padding:55px 20px}.premium-card{display:flex;grid-template-columns:none}.premium-card .card-link{display:grid;grid-template-columns:.85fr 1fr}.premium-card .photo{min-height:250px;height:100%;padding:16px}.premium-card .card-copy{padding:22px 16px}.premium-card h3{font-size:25px}.premium-card .input-range{font-size:18px}.premium-card .product-actions{display:flex;grid-column:1/-1}.premium-card .specs{line-height:1.8}.series{grid-template-columns:1fr}.series-photo{height:270px;min-height:270px}.series-copy{padding:25px}.series-copy h3{font-size:32px}.series-actions .product-actions{flex-direction:row}.series-actions button+button{border-top:0;border-left:1px solid var(--line)}.selection-guide ol{grid-template-columns:1fr;gap:20px;margin:25px 0}.selection-guide li{display:grid;grid-template-columns:36px 1fr;gap:6px 10px}.selection-guide h3{margin:0;font-size:18px}.selection-guide li p{grid-column:2;margin:0;font-size:13px}.selection-guide li>span{padding-top:5px}.fact-grid{grid-template-columns:1fr}.fact-grid>div{display:grid;grid-template-columns:minmax(90px,.7fr) 1.3fr;align-items:start;gap:12px}.fact-grid strong{font-size:15px;margin:0;line-height:1.8}.table-wrap td,.table-wrap th{padding:11px 12px;min-width:90px;font-size:12px}.technical-section h2{font-size:22px;line-height:1.6}.product-tabs{font-size:12px}.calc-result{position:static}.section-heading h2{font-size:29px}.section-heading p:not(.eyebrow){font-size:13px}.selection-tray{max-width:calc(100vw - 24px);bottom:12px;right:12px}.selection-tray button{padding:12px;font-size:11px}body:has(.selection-tray:not([hidden])){padding-bottom:70px}.contact-info>a{font-size:clamp(23px,7vw,32px)}.catalog-tools{gap:14px}.catalog-tools>label{flex-wrap:wrap}.product-actions button{font-size:11px}.quote-dialog,.selection-dialog{padding:20px}}
@media(max-width:380px){.premium-card .card-link{grid-template-columns:1fr}.premium-card .photo{height:230px;min-height:230px}.grid{grid-template-columns:1fr}.grid .photo{height:230px}.grid h3{font-size:15px}.phone{font-size:11px}header{gap:8px}}