:root{
  /* Calm, neutral palette. Light by default; follows the device's dark-mode preference automatically. */
  --bg:#F6F7F9;
  --bg-soft:#F1F3F6;
  --surface:#FFFFFF;
  --surface-2:#F3F5F7;
  --surface-3:#E9EDF1;
  --text:#1E293B;
  --strong-text:#172033;
  --content-text:#425466;
  --muted:#5B677A;
  --muted-2:#788497;
  --line:#D9DEE7;
  --line-strong:#B8C2CF;
  --accent:#356B8C;
  --accent-strong:#2B5873;
  --accent-2:#5C7890;
  --accent-contrast:#FFFFFF;
  --accent-soft:#EAF2F6;
  --accent-border:#BFD2DD;
  --info-soft:#EEF3F6;
  --info-border:#D3E0E7;
  --selected-bg:#F0F5F8;
  --input-bg:#FFFFFF;
  --chip-text:#44566B;
  --warning:#8A641F;
  --warning-soft:#FFF8E8;
  --warning-border:#EAD9AA;
  --warning-text:#6F531B;
  --danger:#9A4C4C;
  --consent-bg:#FFFFFF;
  --consent-border:#CBD5E1;
  --shadow:0 14px 38px rgba(15,23,42,.07);
  --radius:20px;
  --radius-sm:13px;
  color-scheme:light dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);line-height:1.58;background:linear-gradient(180deg,var(--bg) 0%,var(--bg-soft) 100%)}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--accent-2);outline-offset:3px}
button,input,select,textarea{font:inherit}
button{touch-action:manipulation}
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--text);color:var(--bg);padding:10px 14px;border-radius:10px;z-index:10000}.skip-link:focus{left:8px}
.wrap{max-width:1160px;margin:auto;padding:22px}
.site-header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:7px 0 24px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:21px;font-weight:920;letter-spacing:-.035em}.brand span{color:var(--accent)}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--accent-contrast);box-shadow:0 8px 24px rgba(31,41,55,.10)}
.brand-mark svg{width:20px;height:20px}
nav{display:flex;align-items:center;gap:15px;flex-wrap:wrap}nav a{font-size:13px;color:var(--muted);font-weight:650}nav a:hover,nav a[aria-current="page"]{color:var(--text)}
.nav-cta{padding:8px 11px;border:1px solid var(--line);border-radius:10px;background:var(--accent-soft)}
.hero{padding:46px 0 30px;max-width:900px}.eyebrow{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);background:var(--surface-2);border-radius:999px;padding:7px 11px;color:var(--muted);font-size:12px;font-weight:700;margin-bottom:15px}
h1{font-size:clamp(39px,6vw,70px);line-height:1.025;letter-spacing:-.055em;margin:0 0 17px;max-width:900px}h2{letter-spacing:-.03em;line-height:1.16}h3{letter-spacing:-.015em}
.hero p{font-size:clamp(18px,2vw,21px);color:var(--muted);max-width:760px;margin:0}.hero strong{color:var(--text)}
.trust-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:19px}.trust-chip{font-size:12px;color:var(--chip-text);border:1px solid var(--line);border-radius:999px;padding:7px 10px;background:var(--surface-2)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.calculator-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(320px,.8fr);gap:22px;align-items:start}
.panel{padding:23px}.step{display:flex;align-items:center;gap:10px;margin-bottom:5px}.step-number{display:grid;place-items:center;width:27px;height:27px;border-radius:9px;background:var(--accent-soft);border:1px solid var(--accent-border);color:var(--accent);font-weight:900;font-size:12px}.section-title{font-size:18px;font-weight:850;margin:0}.section-sub{color:var(--muted);font-size:13px;margin:0 0 16px}
.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0 22px}.scenario{display:block;text-align:left;min-height:94px;padding:13px;border-radius:15px}.scenario .icon{font-size:22px;display:block;margin-bottom:6px}.scenario strong{display:block;font-size:14px}.scenario small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.scenario.active{border-color:var(--accent);background:var(--selected-bg);box-shadow:inset 0 0 0 1px var(--accent-border)}
button,.btn{appearance:none;border:1px solid var(--line);background:var(--surface-2);color:var(--text);padding:11px 14px;border-radius:12px;font-weight:780;cursor:pointer;transition:border-color .15s ease,transform .15s ease,background .15s ease}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-contrast)}.btn-primary:hover{background:var(--accent-strong);border-color:var(--accent-strong)}button:hover,.btn:hover{border-color:var(--line-strong)}button:active,.btn:active{transform:translateY(1px)}button:disabled{cursor:not-allowed;opacity:.52}
.clear-link{border:0;background:transparent;padding:8px 4px;color:var(--muted);font-size:12px;text-decoration:underline;text-underline-offset:3px}
.field-row{display:grid;grid-template-columns:1fr;gap:12px;margin:14px 0 24px}.field label,.small-label{display:block;color:var(--muted);font-size:12px;font-weight:650;margin:0 0 6px}input,select,textarea{width:100%;background:var(--input-bg);border:1px solid var(--line);color:var(--text);padding:12px 13px;border-radius:12px}input::placeholder,textarea::placeholder{color:var(--muted-2)}
.auto-note{display:flex;gap:8px;align-items:flex-start;padding:10px 12px;background:var(--info-soft);border:1px solid var(--info-border);border-radius:12px;color:var(--content-text);font-size:12px;margin:-10px 0 22px}.auto-note svg{flex:0 0 auto;margin-top:2px;color:var(--accent-2)}
.device-groups{display:grid;gap:16px}.device-group-title{margin:2px 0 8px;color:var(--strong-text);font-size:12px;font-weight:850;text-transform:uppercase;letter-spacing:.08em}.devices{display:grid;gap:8px}.device{display:grid;grid-template-columns:auto minmax(0,1fr) 68px;gap:11px;align-items:center;padding:13px;border:1px solid var(--line);border-radius:14px;background:var(--surface-2);cursor:pointer}.device:hover{border-color:var(--line-strong)}.device.selected{border-color:var(--accent-border);background:var(--selected-bg)}.device input[type="checkbox"]{width:20px;height:20px;accent-color:var(--accent)}.device-name{font-weight:820;font-size:14px}.device-meta{font-size:11px;color:var(--muted);margin-top:2px}.qty label{font-size:10px;color:var(--muted);display:block;margin-bottom:3px}.qty input{padding:8px 7px;text-align:center}.device:not(.selected) .qty{opacity:.42}
.more-devices{margin-top:10px}.more-devices summary{color:var(--accent-2)}
.custom{margin-top:18px;padding-top:17px;border-top:1px solid var(--line)}.custom-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr;gap:9px}.motor-option{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:12px;margin:10px 0}.motor-option input{width:18px;height:18px;accent-color:var(--accent)}
.advanced-block{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.advanced-block summary{cursor:pointer;font-weight:800;color:var(--strong-text)}.advanced{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.advanced-help{font-size:11px;color:var(--muted);margin-top:8px}
.view-result-cta{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:22px;padding:18px;border:1px solid var(--accent-border);border-radius:16px;background:var(--accent-soft)}.view-result-cta .step{margin-bottom:4px}.view-result-cta p{margin:0;color:var(--muted);font-size:12px;max-width:440px}.view-result-button{min-width:150px;white-space:nowrap;font-size:14px}.result-reveal{animation:resultReveal .8s ease}@keyframes resultReveal{0%{box-shadow:0 0 0 0 rgba(31,41,55,0)}35%{box-shadow:0 0 0 4px var(--accent-border),var(--shadow)}100%{box-shadow:var(--shadow)}}
.results{position:sticky;top:18px;overflow:hidden}.result-top{padding:22px}.result-kicker{font-size:11px;color:var(--muted);font-weight:850;letter-spacing:.08em;text-transform:uppercase}.result-class{font-size:clamp(38px,5vw,50px);line-height:1.02;font-weight:950;letter-spacing:-.05em;margin:7px 0 8px}.result-summary{color:var(--muted);font-size:13px;margin:0}.result-badges{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:16px}.result-badge{padding:12px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2)}.result-badge strong{display:block;font-size:18px}.result-badge span{display:block;font-size:10px;color:var(--muted);margin-top:2px}.result-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:15px}.copy-feedback{font-size:11px;color:var(--accent);min-height:17px;margin-top:7px}
.detail-box{border-top:1px solid var(--line);padding:0 22px 19px}.detail-box details{margin-top:14px}.detail-box summary{cursor:pointer;font-weight:800;font-size:13px}.metric-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.metric{padding:11px;border:1px solid var(--line);border-radius:12px}.metric .v{font-weight:880}.metric .k{font-size:10px;color:var(--muted)}
.result-tip{margin-top:13px;padding:12px;border-radius:13px;background:var(--accent-soft);border:1px solid var(--accent-border);font-size:12px;color:var(--content-text)}.result-tip strong{color:var(--accent)}
.affiliate-recommendations{margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}
.affiliate-head h3{margin:2px 0 5px;font-size:17px}.affiliate-head p{margin:0;color:var(--muted);font-size:12px}.affiliate-kicker{font-size:10px;color:var(--muted);font-weight:850;letter-spacing:.08em;text-transform:uppercase}
.affiliate-store-list{display:grid;gap:8px;margin-top:12px}.affiliate-store{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 13px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2);transition:border-color .15s ease,background .15s ease,transform .15s ease}.affiliate-store:hover{border-color:var(--line-strong);background:var(--selected-bg)}.affiliate-store:active{transform:translateY(1px)}.affiliate-store strong{display:block;font-size:13px}.affiliate-store small{display:block;color:var(--muted);font-size:10px;margin-top:2px}.affiliate-arrow{font-size:19px;color:var(--accent);font-weight:800;flex:0 0 auto}.affiliate-disclosure{margin:10px 0 0!important;color:var(--muted)!important;font-size:10px!important;line-height:1.5}.affiliate-disclosure a{text-decoration:underline;text-underline-offset:2px;color:var(--accent-2)}
.warning{margin-top:13px;padding:12px 13px;border-radius:13px;background:var(--warning-soft);border:1px solid var(--warning-border);color:var(--warning-text);font-size:11px}
.how{margin:34px 0 8px;display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.mini{padding:17px}.mini b{display:block;margin-bottom:4px}.mini span{font-size:12px;color:var(--muted)}
.faq{padding:31px 0}.faq h2{font-size:29px;margin-bottom:16px}.faq details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 15px;margin:9px 0}.faq details p{color:var(--muted);font-size:13px}.faq summary{cursor:pointer;font-weight:800}
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:18px 0}.article-card{padding:18px}.article-card h3{margin:0 0 7px;font-size:17px}.article-card p{color:var(--muted);font-size:13px}.article-card a{color:var(--accent);font-weight:820;font-size:13px}
.content{max-width:830px;margin:0 auto;padding:26px 0 52px}.content h1{font-size:clamp(38px,5vw,52px)}.content h2{margin-top:32px;font-size:25px}.content p,.content li{color:var(--content-text)}.content a:not(.btn){color:var(--accent-2);text-decoration:underline;text-underline-offset:3px}.content strong{color:var(--strong-text)}
.lede{font-size:18px!important;color:var(--content-text)!important}.info-box{padding:15px 16px;border:1px solid var(--line);border-radius:14px;background:var(--surface-2);margin:18px 0}.info-box strong{color:var(--text)}.table-wrap{overflow-x:auto}.simple-table{width:100%;border-collapse:collapse;margin:18px 0}.simple-table th,.simple-table td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line)}.simple-table th{color:var(--text);font-size:12px}.simple-table td{color:var(--content-text);font-size:13px}.source-list{font-size:13px;color:var(--muted);padding-left:18px}.source-list a{color:var(--accent-2)}
.contact-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:start}.contact-form{display:grid;gap:12px}.contact-form textarea{min-height:155px;resize:vertical}.contact-form button{justify-self:start}.contact-card{padding:18px}.contact-card p{font-size:13px}.notice{font-size:11px;color:var(--muted)}
.policy-note{padding:12px 14px;border-radius:12px;background:var(--info-soft);border:1px solid var(--info-border);font-size:12px;color:var(--content-text)}
.updated{font-size:11px;color:var(--muted-2);margin-top:26px}
.site-footer{padding:30px 0 50px;color:var(--muted);font-size:11px;border-top:1px solid var(--line);margin-top:30px}.footer-grid{display:flex;justify-content:space-between;gap:22px;align-items:flex-start}.footer-links{display:flex;gap:10px;flex-wrap:wrap}.footer-links a:hover{color:var(--text)}.footer-note{max-width:620px;margin-top:8px}.footer-brand{font-weight:850;color:var(--strong-text)}
#rkk-consent{position:fixed;left:16px;right:16px;bottom:16px;z-index:9999;display:flex;justify-content:center}.rkk-consent-inner{max-width:920px;width:100%;display:flex;gap:18px;align-items:center;justify-content:space-between;padding:15px 17px;background:var(--consent-bg);border:1px solid var(--consent-border);border-radius:16px;box-shadow:0 18px 60px rgba(15,23,42,.16)}.rkk-consent-inner strong{display:block;margin-bottom:3px}.rkk-consent-inner p{margin:0;color:var(--muted);font-size:12px}.rkk-consent-inner a{text-decoration:underline;color:var(--accent-2)}.rkk-consent-actions{display:flex;gap:8px;flex-shrink:0}.rkk-consent-secondary{background:transparent}

@media(prefers-color-scheme:dark){
  :root{
    --bg:#171A1F;
    --bg-soft:#1A1E24;
    --surface:#20242B;
    --surface-2:#252B33;
    --surface-3:#2B323B;
    --text:#F2F4F7;
    --strong-text:#F5F7FA;
    --content-text:#C9D0DA;
    --muted:#AAB2BF;
    --muted-2:#87919F;
    --line:#353C46;
    --line-strong:#4A5563;
    --accent:#8FB8D6;
    --accent-strong:#A2C6DE;
    --accent-2:#A7B7C7;
    --accent-contrast:#10202B;
    --accent-soft:#26333D;
    --accent-border:#405A6D;
    --info-soft:#242C34;
    --info-border:#3A4652;
    --selected-bg:#26313A;
    --input-bg:#1B2026;
    --chip-text:#D4DBE4;
    --warning:#E2C06C;
    --warning-soft:#2C281E;
    --warning-border:#514A32;
    --warning-text:#F0D999;
    --danger:#E89A9A;
    --consent-bg:#20242B;
    --consent-border:#46505D;
    --shadow:0 16px 42px rgba(0,0,0,.22);
  }
}
@media(max-width:900px){.calculator-layout{grid-template-columns:1fr}.results{position:static}.article-grid{grid-template-columns:1fr 1fr}.contact-grid{grid-template-columns:1fr}}
@media(max-width:680px){.wrap{padding:16px}.site-header{align-items:flex-start;flex-direction:column;padding-bottom:12px}nav{gap:11px}.nav-cta{display:none}.hero{padding:28px 0 22px}.scenario-grid{grid-template-columns:1fr}.scenario{min-height:0}.how{grid-template-columns:1fr}.article-grid{grid-template-columns:1fr}.custom-grid{grid-template-columns:1fr}.advanced{grid-template-columns:1fr}.view-result-cta{align-items:stretch;flex-direction:column}.view-result-button{width:100%}.result-badges{grid-template-columns:1fr 1fr}.footer-grid{flex-direction:column}.rkk-consent-inner{align-items:stretch;flex-direction:column}.rkk-consent-actions{width:100%}.rkk-consent-actions button{flex:1}}
@media(max-width:430px){.device{grid-template-columns:auto 1fr 58px;padding:12px}.result-badges{grid-template-columns:1fr}.metric-grid{grid-template-columns:1fr}.result-class{font-size:38px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Watt / Wh / kWh conversion guide */
.formula-box{display:flex;align-items:center;justify-content:space-between;gap:16px}.formula-box span{font-weight:850;color:var(--strong-text);font-size:16px}.conversion-tools{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0 34px}.conversion-card{padding:20px}.conversion-card h2{margin:4px 0 7px;font-size:22px}.conversion-card>p{margin:0 0 16px;font-size:13px;color:var(--muted)}.conversion-kicker{font-size:10px;color:var(--muted);font-weight:850;letter-spacing:.08em;text-transform:uppercase}.conversion-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.conversion-grid label{display:block;font-size:12px;font-weight:750;color:var(--content-text)}.conversion-grid input{margin-top:6px;font-size:16px;font-weight:750}.conversion-hint{margin-top:8px;color:var(--muted);font-size:11px}.conversion-result{display:flex;flex-direction:column;gap:2px;margin-top:15px;padding:14px;border-radius:14px;background:var(--accent-soft);border:1px solid var(--accent-border)}.conversion-result span{font-size:10px;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.07em}.conversion-result strong{font-size:25px;line-height:1.15;color:var(--strong-text);letter-spacing:-.03em}.conversion-result small{font-size:11px;color:var(--muted)}.next-step{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:34px 0;padding:22px}.next-step h2{margin:4px 0 8px}.next-step p{margin:0;max-width:590px}.next-step .btn{flex:0 0 auto;white-space:nowrap}.related-guides{margin-top:36px}
@media(max-width:760px){.conversion-tools{grid-template-columns:1fr}.formula-box{align-items:flex-start;flex-direction:column;gap:5px}.conversion-grid{grid-template-columns:1fr 1fr}.next-step{align-items:stretch;flex-direction:column}.next-step .btn{width:100%}}
@media(max-width:430px){.conversion-grid{grid-template-columns:1fr}}