/* Base */
*{box-sizing:border-box}
html:focus-within{scroll-behavior:smooth}
body{
  margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif;
  line-height:1.6;color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}

/* Theme */
:root{
  --bg:#0f1216;--card:#141a21;--text:#e9edf2;--muted:#97a3b6;
  --brand:#6be0ff;--brand-ink:#08141a;--ring:0 0 0 3px rgba(107,224,255,.35);
}
:root.light{
  --bg:#ffffff;--card:#f6f7f9;--text:#0f1216;--muted:#606b7a;
  --brand:#0ea5e9;--brand-ink:#ffffff;
}
@media (prefers-color-scheme:light){
  :root:not(.dark){--bg:#ffffff;--card:#f6f7f9;--text:#0f1216;--muted:#606b7a;--brand:#0ea5e9;--brand-ink:#ffffff;}
}

/* Layout */
.container{max-width:1100px;margin-inline:auto;padding:clamp(16px,2vw,24px)}
.row{display:flex;align-items:center;justify-content:space-between;gap:16px}
.row-wrap{display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.grid-3{display:grid;gap:16px;grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:900px){.grid-3{grid-template-columns:1fr}}
.muted{color:var(--muted)}
.sr-only{position:absolute!important;clip:rect(1px,1px,1px,1px);padding:0;border:0;height:1px;width:1px;overflow:hidden}

/* Header */
.site-header{position:sticky;top:0;z-index:10;background:linear-gradient(180deg,rgba(0,0,0,.4),transparent);backdrop-filter:saturate(140%) blur(6px)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.brand img{width:36px;height:36px;object-fit:cover;border-radius:8px}
.brand-name{font-weight:700;letter-spacing:.2px}
.mode-toggle{border:1px solid rgba(255,255,255,.15);background:transparent;color:var(--text);padding:8px 12px;border-radius:10px;cursor:pointer}
.mode-toggle:focus-visible{outline:none;box-shadow:var(--ring)}
.icon-sun{display:none}.light .icon-sun{display:inline}.light .icon-moon{display:none}

/* Hero */
.hero{padding:clamp(32px,6vw,72px) 0}
.hero h1{font-size:clamp(28px,4vw,44px);line-height:1.15;margin:0 0 10px}
.lead{color:var(--muted);max-width:60ch;margin:0 0 18px}
.hero-visual{margin-top:18px;border-radius:16px;overflow:hidden;background:var(--card)}
.hero-visual img{width:100%;display:block}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:12px;border:1px solid transparent;text-decoration:none;font-weight:600;letter-spacing:.2px;transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease}
.btn:focus-visible{outline:none;box-shadow:var(--ring)}
.btn-primary{background:var(--brand);color:var(--brand-ink)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.12);filter:brightness(.98)}
.btn-ghost{border-color:rgba(255,255,255,.15);color:var(--text)}
.btn-ghost:hover{background:rgba(255,255,255,.06);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.12)}

/* Features */
.features{padding:24px 0}
.card{background:var(--card);border:1px solid rgba(255,255,255,.08);padding:20px;border-radius:14px;min-height:140px;transition:transform .25s ease,box-shadow .25s ease;will-change:transform}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(0,0,0,.15)}
.card h3{margin:0 0 8px;font-size:clamp(18px,2.2vw,22px)}

/* Specs */
.specs{padding:8px 0 24px}
.specs h2{margin:0 0 8px}
.spec-list{display:grid;gap:6px;margin:0;padding:0;list-style:none}

/* CTA band */
.cta-band{padding:18px 0;background:linear-gradient(90deg,rgba(107,224,255,.12),transparent)}
.cta-title{margin:0 8px 0 0}

/* FAQ */
.faq{padding:24px 0}
details{background:var(--card);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:12px 14px}
details+details{margin-top:10px}
summary{cursor:pointer;font-weight:600}
summary:focus{outline:none}

/* Footer */
.site-footer{padding:24px 0;border-top:1px solid rgba(255,255,255,.08)}
.footer-nav a{color:var(--muted);text-decoration:none;margin-left:12px}
.footer-nav a:hover{text-decoration:underline}

/* Accessibility */
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:8px;top:8px;width:auto;height:auto;background:#111;color:#fff;padding:8px 10px;border-radius:8px}

/* Motion preference */
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}

/* Reveal animations */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease;will-change:opacity,transform}
.reveal.in-view{opacity:1;transform:translateY(0)}
.reveal.delay-1{transition-delay:.1s}
.reveal.delay-2{transition-delay:.2s}
.reveal.delay-3{transition-delay:.3s}