:root{
  --ink:#18211d;--muted:#58635d;--paper:#f6f4ed;--card:#fffdf7;
  --green:#214f3b;--green2:#173b2c;--lime:#d9e45b;--line:#d9ddd4;--warn:#fff3c4;
  --max:1120px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:var(--green);text-decoration-thickness:1px;text-underline-offset:3px}
img,svg{max-width:100%;height:auto}
.wrap{width:min(var(--max),calc(100% - 36px));margin:auto}
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:70px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:800;font-size:1.2rem}
.logo{width:38px;height:38px;border-radius:10px;background:var(--green);display:grid;place-items:center;color:var(--lime);font-size:1.25rem}
nav{display:flex;gap:20px;align-items:center}
nav a{text-decoration:none;color:var(--ink);font-weight:700;font-size:.93rem}
.menu{display:none;background:none;border:0;font-size:1.5rem}
.hero{padding:68px 0 50px;background:linear-gradient(135deg,#eef0df,#f8f6ef)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center}
.eyebrow{font-size:.78rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--green)}
h1{font-size:clamp(2.35rem,5vw,4.5rem);line-height:1.02;letter-spacing:-.04em;margin:.18em 0}
h2{font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.15;letter-spacing:-.02em;margin:1.5em 0 .55em}
h3{line-height:1.25;margin-top:1.4em}
.lede{font-size:1.15rem;color:#3e4943;max-width:720px}
.btn{display:inline-block;background:var(--green);color:white;text-decoration:none;font-weight:800;padding:13px 18px;border-radius:9px;margin:8px 8px 8px 0}
.btn.alt{background:transparent;color:var(--green);border:1px solid var(--green)}
.note{font-size:.86rem;color:var(--muted)}
.battery-art{background:#173b2c;border-radius:26px;padding:30px;min-height:330px;display:grid;place-items:center}
.battery{width:270px;height:155px;border:8px solid #f7f4e9;border-radius:18px;position:relative}
.battery:after{content:"";position:absolute;right:-27px;top:46px;width:20px;height:48px;background:#f7f4e9;border-radius:0 7px 7px 0}
.charge{height:100%;width:68%;background:var(--lime);border-radius:8px;display:grid;place-items:center;color:#173b2c;font-size:3rem;font-weight:900}
.section{padding:52px 0}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}
.card h3{margin-top:0}
.kicker{background:#e9edd2;border-left:4px solid var(--green);padding:15px 18px;border-radius:6px}
.article{max-width:800px;margin:auto;padding:44px 0 70px}
.article h1{font-size:clamp(2.1rem,5vw,3.5rem)}
.article p,.article li{font-size:1.04rem}
.toc{background:white;border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin:26px 0}
.toc a{display:block;padding:4px 0}
.safety{background:var(--warn);border:1px solid #e4cd6d;border-radius:12px;padding:18px 20px}
.cta{background:var(--green2);color:white;border-radius:18px;padding:30px;margin:34px 0}
.cta a{color:white}.cta .btn{background:var(--lime);color:#173b2c}
.breadcrumbs{font-size:.85rem;color:var(--muted);padding-top:24px}
footer{background:#12251c;color:#dce5df;padding:42px 0}
footer a{color:#eef6f0}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.badge{display:inline-block;background:#edf0de;border:1px solid #d6dcb6;border-radius:999px;padding:5px 10px;font-size:.78rem;font-weight:700;margin:3px}
table{width:100%;border-collapse:collapse;background:white}
th,td{padding:13px;border:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#edf0e6}
@media(max-width:800px){
 .hero-grid,.grid3,.foot{grid-template-columns:1fr}
 nav{display:none;position:absolute;left:0;right:0;top:70px;background:white;padding:18px;flex-direction:column;border-bottom:1px solid var(--line)}
 nav.open{display:flex}.menu{display:block}.hero{padding-top:42px}.battery-art{min-height:250px}
}