:root{
 --brand:#3E6DB5;--brand-600:#345C9B;--brand-700:#2A4B80;--navy:#1F2A44;--navy-800:#161E33;
 --accent:#16B8A6;--accent-600:#0E9E8E;--success:#1EA463;--bg-light:#E3EDF7;--bg-soft:#F4F8FC;
 --surface:#fff;--text:#1F2A44;--muted:#5A6B82;--border:#D4E0EE;--focus:#FFB020;
 --r-sm:8px;--r-md:14px;--r-lg:20px;--r-pill:9999px;
 --shadow-sm:0 1px 2px rgba(31,42,68,.06),0 1px 3px rgba(31,42,68,.08);
 --shadow-md:0 4px 12px rgba(31,42,68,.08),0 2px 4px rgba(31,42,68,.06);
 --shadow-lg:0 12px 32px rgba(31,42,68,.12);--shadow-brand:0 8px 24px rgba(62,109,181,.28);
 --font-head:'Poppins',system-ui,-apple-system,sans-serif;--font-body:'Inter',system-ui,sans-serif;
 --container:1140px;--ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box}
html{font-size:16px;scroll-behavior:smooth}
[id]{scroll-margin-top:88px}
body{margin:0;font-family:var(--font-body);color:var(--text);line-height:1.65;background:var(--surface);-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--font-head);color:var(--navy);line-height:1.15;margin:0 0 .5em}
h1{font-size:clamp(2.25rem,4vw,3.25rem);line-height:1.08;font-weight:700}
h2{font-size:clamp(1.75rem,3vw,2.25rem);font-weight:600}
h3{font-size:1.375rem;font-weight:600}
p{margin:0 0 1rem}
a{color:var(--brand-700);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.container{max-width:var(--container);margin-inline:auto;padding-inline:24px}
.section{padding-block:clamp(48px,8vw,96px)}
.section--light{background:var(--bg-light)}
.section--soft{background:var(--bg-soft)}
.section--navy{background:linear-gradient(160deg,var(--navy),var(--navy-800));color:#fff}
.section--navy h2,.section--navy h3{color:#fff}
.eyebrow{font-family:var(--font-body);font-weight:700;font-size:.8125rem;letter-spacing:.09em;text-transform:uppercase;color:var(--brand);margin-bottom:.6rem;display:block;line-height:1.5}
.lead{font-size:1.125rem;color:var(--muted);max-width:62ch}
.muted{color:var(--muted)}
.measure{max-width:65ch}
.skip-link{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:10px 16px;z-index:100}
.skip-link:focus{left:8px;top:8px}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font:600 1rem/1 var(--font-body);padding:14px 26px;border-radius:var(--r-pill);border:2px solid transparent;cursor:pointer;transition:transform .18s var(--ease),background .18s,box-shadow .18s}
.btn:hover{text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:var(--shadow-brand)}
.btn-primary:hover{background:var(--brand-600);transform:translateY(-1px);color:#fff}
.btn-secondary{background:transparent;color:var(--brand);border-color:var(--brand)}
.btn-secondary:hover{background:var(--bg-light)}
.btn-lg{padding:16px 32px;font-size:1.0625rem}
.on-dark .btn-primary{background:#fff;color:var(--brand-700);box-shadow:none}
.on-dark .btn-secondary{color:#fff;border-color:rgba(255,255,255,.7)}
.on-dark .btn-secondary:hover{background:rgba(255,255,255,.1)}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:1.6rem}
.trust-line{margin-top:1.2rem;font-size:.9rem;color:var(--muted)}
/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:saturate(140%) blur(6px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:700;font-size:1.25rem;color:var(--navy);margin-right:clamp(24px,4vw,56px)}
.foot-battery{height:28px;width:auto;display:block}
.hero-battery{width:130px;height:auto;display:inline-block}
.brand:hover{text-decoration:none}
.brand svg{width:30px;height:30px}
.brand-logo{height:32px;width:auto;display:block}
.nav-links{display:flex;align-items:center;gap:22px;list-style:none;margin:0;padding:0;flex-wrap:nowrap;white-space:nowrap;flex:1}
.nav-links a{color:var(--navy);font-weight:500;font-size:.95rem}
.nav-cta{margin-left:auto}
.menu-toggle,.menu-check{display:none}
@media(max-width:1040px){
 .nav-links{position:fixed;inset:72px 0 auto 0;flex-direction:column;align-items:flex-start;white-space:normal;background:#fff;border-bottom:1px solid var(--border);padding:18px 24px;gap:16px;box-shadow:var(--shadow-md);transform:translateY(-130%);transition:transform .25s var(--ease)}
 .menu-check:checked~.nav-links{transform:translateY(0)}
 .nav-cta{margin-left:0}
 .menu-toggle{display:inline-flex;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
 .menu-toggle span{width:24px;height:2px;background:var(--navy);display:block}
}
/* hero */
.hero{background:linear-gradient(160deg,var(--bg-soft),var(--bg-light))}
.hero .grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
@media(max-width:860px){.hero .grid{grid-template-columns:1fr}}
.hero-visual{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);padding:24px;min-height:260px;display:grid;place-items:center}
/* grids & cards */
.grid-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px;margin-top:2rem}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px;margin-top:2rem}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);padding:24px;box-shadow:var(--shadow-sm);transition:box-shadow .18s,transform .18s}
a.card{color:inherit;display:block}
a.card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);text-decoration:none}
.card--top{border-top:3px solid var(--brand)}
.card__icon{width:48px;height:48px;border-radius:var(--r-sm);display:grid;place-items:center;background:var(--bg-light);color:var(--brand);margin-bottom:14px;font-size:24px}
.card h3{margin-bottom:.35em}
.card .more{color:var(--brand);font-weight:600;font-size:.95rem}
.step{position:relative;padding-left:8px}
.step .num{font-family:var(--font-head);font-weight:700;font-size:2rem;color:var(--brand);opacity:.55;line-height:1}
.pillars{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;margin-top:2rem}
.stat{text-align:center;padding:18px}
.stat b{display:block;font-family:var(--font-head);font-size:2.2rem;color:var(--brand);line-height:1}
.stat span{color:var(--muted);font-size:.95rem}
.quote{font-family:var(--font-head);font-size:1.4rem;color:var(--navy);max-width:48ch;margin:1.5rem auto 0;text-align:center}
/* savings ladder */
.ladder{display:grid;gap:14px;margin-top:2rem}
.rung{display:grid;grid-template-columns:minmax(190px,1.25fr) 2.4fr auto;gap:8px 18px;align-items:center}
@media(max-width:760px){.rung{grid-template-columns:1fr;gap:4px}.rung__val{text-align:left}}
.rung__label b{display:block;font-family:var(--font-head);font-weight:600;color:var(--navy);font-size:1rem}
.rung__label span{font-size:.82rem;color:var(--muted)}
.rung__track{background:var(--border);border-radius:99px;height:20px;overflow:hidden}
.rung__track .bar{display:block;height:100%;border-radius:99px;background:var(--brand)}
.bar--grey{background:#AEBBCC}
.bar--brand{background:linear-gradient(90deg,var(--brand),var(--accent))}
.rung__val{font-family:var(--font-head);font-weight:700;color:var(--brand);white-space:nowrap;min-width:96px;text-align:right}
.rung--muted .rung__label b{color:var(--muted-2,#5A6B82)}.rung--muted .rung__val{color:var(--muted)}
/* table */
table.compare{width:100%;border-collapse:collapse;margin-top:1.5rem;background:#fff;border-radius:var(--r-md);overflow:hidden;box-shadow:var(--shadow-sm)}
table.compare th,table.compare td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--border);font-size:.95rem;vertical-align:top}
table.compare thead th{background:var(--brand);color:#fff;font-family:var(--font-head)}
table.compare tbody th{font-weight:600;color:var(--navy);width:26%}
table.compare td:last-child{background:var(--bg-light)}
/* faq */
.faq{border:1px solid var(--border);border-radius:var(--r-md);background:#fff;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-family:var(--font-head);font-weight:600;color:var(--navy);list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand);font-size:1.4rem;line-height:1}
.faq[open] summary::after{content:"\2212"}
.faq .a{padding:0 20px 18px;color:var(--muted)}
/* cta band */
.cta-band{text-align:center}
.cta-band .cta-row{justify-content:center}
/* footer */
footer.site{background:var(--navy-800);color:rgba(255,255,255,.78);padding-block:56px 28px}
footer.site a{color:rgba(255,255,255,.78)}
footer.site a:hover{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.5fr repeat(4,1fr);gap:28px}
@media(max-width:900px){.foot-grid{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:560px){.foot-grid{grid-template-columns:1fr 1fr}}
footer.site h4{color:#fff;font-size:.95rem;letter-spacing:.04em;margin-bottom:14px}
footer.site ul{list-style:none;margin:0;padding:0;display:grid;gap:9px;font-size:.92rem}
.foot-brand .brand{color:#fff}
.social{display:flex;gap:12px;margin-top:18px}
.social a{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.08);color:rgba(255,255,255,.8);transition:background .18s,color .18s}
.social a:hover{background:var(--brand);color:#fff}
.social svg{width:18px;height:18px}
.foot-legal{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.85rem}
.foot-legal a{color:rgba(255,255,255,.7)}
.foot-bottom{margin-top:16px;padding-top:0;font-size:.82rem;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;color:rgba(255,255,255,.6)}
.legal{max-width:760px}
.legal h1{margin-bottom:.3em}
.legal .updated{color:var(--muted);font-size:.9rem;margin-bottom:2rem}
.legal h2{font-size:1.4rem;margin-top:2rem}
.legal h3{font-size:1.1rem;margin-top:1.4rem}
.legal p,.legal li{color:var(--text);font-size:1rem}
.legal ul{padding-left:1.2rem}
.partners{display:flex;flex-wrap:wrap;gap:12px 14px;justify-content:center;margin-top:1.8rem}
.partners span,.partners a{background:#fff;border:1px solid var(--border);border-radius:var(--r-pill);padding:8px 18px;font-weight:600;color:var(--navy);box-shadow:var(--shadow-sm);font-size:.95rem}
.partners a{text-decoration:none;transition:border-color .15s,color .15s}
.partners a:hover{border-color:var(--brand);color:var(--brand)}
.tcard{background:#fff;border:1px solid var(--border);border-radius:var(--r-md);padding:24px;box-shadow:var(--shadow-sm)}
.tcard p{font-style:italic;color:var(--text)}
.tcard .who{font-style:normal;font-weight:600;color:var(--brand);margin-top:10px;font-size:.92rem}
.tcard-person{text-align:center}
.avatar{width:128px;height:128px;border-radius:50%;object-fit:cover;margin:0 auto 14px;display:block;border:3px solid var(--bg-light);box-shadow:var(--shadow-sm);background:var(--bg-light)}
.breadcrumb{font-size:.85rem;color:var(--muted);padding-top:18px}
.topbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;padding-top:18px}
.topbar .breadcrumb{padding-top:0}
.toplink{font-weight:600;color:var(--brand);font-size:.9rem}
/* overflow guards: grid items default to min-width:auto and won't shrink below content */
body{overflow-x:hidden}
.hero .grid>*,.grid-cards>*,.grid-3>*,.pillars>*,.foot-grid>*{min-width:0}
.lead,p,h1,h2,h3{overflow-wrap:break-word}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
/* supported-battery brand logos */
.oem{height:1.05em;width:auto;vertical-align:-0.16em;display:inline-block}
.partners a .oem{height:22px;vertical-align:middle}
.partners a:has(.oem){display:inline-flex;align-items:center;padding:7px 16px}
footer.site .oem{height:15px;vertical-align:-0.2em}
.hero-oem{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center}
.hero-oem .oem-big{height:46px;width:auto}
.hero-oem .muted{margin:0}
.oem-lockup{display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap}
.oem-lockup .oem{height:26px;vertical-align:middle}
/* --- responsive fixes (UX review) --- */
@media(max-width:760px){
 /* any grid/grid-3 with an inline column override is a 2-column block — stack it */
 .grid[style],.grid-3[style]{grid-template-columns:1fr!important;gap:24px!important}
}
@media(max-width:560px){
 h1{font-size:2.05rem;line-height:1.14}
 /* dense viz grids collapse to one column on phones */
 [style*="minmax(340px"]{grid-template-columns:1fr!important}
 /* comparison table breathes */
 table.compare th,table.compare td{padding:9px 10px;font-size:.82rem}
 table.compare tbody th{width:34%}
}