:root{
  --ink:#0c141c; --ink2:#111c26; --card:#ffffff; --text:#16222e; --mut:#5c6b78;
  --green:#12b886; --green2:#0c9c73; --mint:#22d39e; --line:#e3e9ee; --soft:#f4f7f9;
  --steel:#14202c; --sky:#2aa9e0;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  color:var(--text);background:#fff;line-height:1.62;font-size:17px}
img{max-width:100%;height:auto;display:block}
a{color:var(--green2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.narrow{max-width:820px;margin:0 auto}
h1,h2,h3,h4{font-family:"Space Grotesk","Inter",system-ui,sans-serif;line-height:1.14;margin:0 0 .5em;font-weight:700}
.h1{font-size:2.9rem;font-weight:700;letter-spacing:-.02em}
.h2{font-size:2.1rem;font-weight:700;letter-spacing:-.01em}
.h3{font-size:1.3rem;font-weight:700}
.c{text-align:center}
.lead{font-size:1.18rem;color:#c3d2dd}
.muted{color:var(--mut)}

/* header */
.top{background:var(--ink);position:sticky;top:0;z-index:30;border-bottom:1px solid #1d2d3a}
.top-in{display:flex;align-items:center;justify-content:space-between;min-height:74px;gap:18px;padding:10px 0}
.brand img{height:46px;width:auto}
.nav{display:flex;gap:24px;flex-wrap:wrap}
.nav a{color:#c3d0db;font-weight:600;font-size:.93rem}
.nav a:hover,.nav a[aria-current=page]{color:var(--mint);text-decoration:none}

/* buttons */
.btn{display:inline-block;background:var(--green);color:#04120d;font-weight:700;
  padding:13px 26px;border-radius:9px;border:0;cursor:pointer;transition:.15s}
.btn:hover{background:var(--green2);text-decoration:none;color:#fff}
.btn.ghost{background:transparent;color:#eaf4f0;border:1.5px solid #32485a}
.btn.ghost:hover{border-color:var(--mint);color:var(--mint)}

/* hero */
.hero{background:radial-gradient(1100px 520px at 82% -12%,#113a30 0,transparent 58%),linear-gradient(180deg,#0c141c,#101d27);
  color:#eaf4f0;padding:82px 0 76px}
.hero .h1{color:#fff}
.hero-in{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center}
.kicker{display:inline-block;color:var(--mint);font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;font-size:.78rem;margin:0 0 12px}
.hero-card{background:#0f1c26;border:1px solid #1f3443;border-radius:16px;padding:28px}
.hero-card ul{list-style:none;margin:0;padding:0}
.hero-card li{display:flex;gap:13px;align-items:center;padding:13px 0;border-bottom:1px solid #1b2d3a;color:#d4e2ea;font-weight:600}
.hero-card li:last-child{border:0}
.hero-card .ic{flex:0 0 42px;height:42px;border-radius:10px;background:#12b88618;display:grid;place-items:center}

/* battery meter accent (pure CSS, decorative) */
.meter{display:flex;gap:4px;margin-top:4px}
.meter span{height:8px;flex:1;border-radius:2px;background:#1c3340}
.meter span.on{background:var(--mint)}

/* sections */
.sec{padding:70px 0}
.sec.soft{background:var(--soft)}
.sec.dark{background:linear-gradient(180deg,#0f1c26,#0c141c);color:#eaf4f0}
.sec.dark .h2{color:#fff}
.eyebrow{color:var(--green2);font-weight:700;text-transform:uppercase;letter-spacing:.12em;font-size:.76rem;margin:0 0 8px}

/* category grid */
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;
  transition:.16s;display:block;color:var(--text)}
.cat:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(10,40,30,.10);text-decoration:none;border-color:var(--mint)}
.cat svg{width:44px;height:44px;margin-bottom:14px}
.cat h3{margin:0 0 6px;font-size:1.18rem}
.cat p{margin:0;color:var(--mut);font-size:.96rem}

/* feature row */
.feats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feat{text-align:center}
.feat .fi{width:58px;height:58px;margin:0 auto 12px;border-radius:14px;background:#12b88618;display:grid;place-items:center;border:1px solid #1f3443}
.feat .fi svg{width:30px;height:30px}
.feat h3{color:#fff;font-size:1.1rem;margin:0 0 4px}
.feat p{color:#aec0cc;font-size:.95rem;margin:0}

/* spec cards */
.specs{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.spec{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px;text-align:center}
.spec .big{font-family:"Space Grotesk",sans-serif;font-size:2.2rem;font-weight:700;color:var(--green2);line-height:1}
.spec p{margin:8px 0 0;color:var(--mut);font-size:.95rem}

/* two columns */
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px}
.ticks{list-style:none;margin:0;padding:0}
.ticks li{position:relative;padding:8px 0 8px 30px;border-bottom:1px solid var(--line)}
.ticks li:last-child{border:0}
.ticks li:before{content:"";position:absolute;left:0;top:13px;width:16px;height:16px;border-radius:4px;
  background:var(--green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M5 12l4 4 10-10'/%3E%3C/svg%3E") center/11px no-repeat}

/* faq */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;padding:4px 20px}
.faq summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none;position:relative;font-family:"Space Grotesk",sans-serif}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";position:absolute;right:0;top:14px;font-size:1.5rem;color:var(--green2)}
.faq details[open] summary:after{content:"–"}
.faq p{margin:0 0 16px;color:#3a4855}

/* banner strip */
.strip{background:linear-gradient(90deg,#0f1c26,#114536);color:#eaf4f0;border-radius:16px;padding:42px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.strip h2{margin:0;color:#fff}

/* content */
.prose h2{font-size:1.6rem;margin:1.3em 0 .4em}
.prose h3{font-size:1.2rem;margin:1.1em 0 .3em}
.prose p{margin:0 0 1em;color:#2b3a47}
.prose ul{margin:0 0 1em;padding-left:1.2em;color:#2b3a47}

/* slim hero */
.hero.slim{padding:58px 0 50px}
.hero.slim .h1{font-size:2.3rem}

/* notice */
.notice{background:#eef6f3;border:1px solid var(--line);border-radius:12px;padding:15px 18px;color:#44555f;font-size:.93rem;margin-top:16px}
.notice.dark{background:#0f1c26;border-color:#1f3443;color:#cfdde6}

/* footer */
.foot{background:var(--ink);color:#9fb1bd;padding:52px 0 34px;border-top:1px solid #1d2d3a}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:28px;margin-bottom:28px}
.foot img{height:42px;margin-bottom:12px}
.foot h4{color:#fff;font-size:.9rem;margin:0 0 10px;text-transform:uppercase;letter-spacing:.06em;font-family:"Space Grotesk",sans-serif}
.foot a{color:#9fb1bd;display:block;padding:4px 0;font-size:.95rem}
.foot a:hover{color:var(--mint);text-decoration:none}
.foot .copy{border-top:1px solid #1d2d3a;padding-top:20px;font-size:.87rem;color:#7a8b97}

@media(max-width:900px){
  .hero-in,.cols2{grid-template-columns:1fr}
  .cats{grid-template-columns:repeat(2,1fr)}
  .feats{grid-template-columns:repeat(2,1fr)}
  .specs{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .h1,.hero .h1{font-size:2.2rem}
}
@media(max-width:560px){
  body{font-size:16px}
  .cats{grid-template-columns:1fr}
  .nav{gap:12px 16px;justify-content:center}
  .top-in{flex-direction:column;gap:8px}
  .sec{padding:50px 0}
  .strip{padding:28px}
  .foot-grid{grid-template-columns:1fr}
  .hero{padding:56px 0}
}