:root{
  --bg:#ffffff; --bg-alt:#f4f7fa; --text:#0f1b2d; --muted:#506079; --line:#dde4ec;
  --card:#ffffff; --accent:#2dd4bf; --accent-ink:#0f766e; --hero:#081423; --hero-text:#e8eef6; --hero-muted:#9fb0c6;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0b1522; --bg-alt:#0f1c2c; --text:#e6edf5; --muted:#9fb0c6; --line:#1f3045; --card:#102033; --accent-ink:#5eead4; color-scheme:dark}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,5vw,3.4rem);font-weight:750}
h2{font-size:clamp(1.6rem,3.4vw,2.3rem);font-weight:700}
h3{font-size:1.1rem;font-weight:650}
.wrap{max-width:1120px;margin:0 auto;padding-inline:20px}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:700;color:var(--accent-ink);margin:0 0 .6rem}
.sub{color:var(--muted);max-width:640px;margin:0 0 2rem}

.nav{position:sticky;top:0;z-index:10;background:rgba(8,20,35,.92);backdrop-filter:blur(8px);color:var(--hero-text);border-bottom:1px solid rgba(255,255,255,.06)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:750;font-size:1.05rem}
.muted-brand{color:var(--hero-muted);font-weight:500}
.nav nav{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.nav nav a{text-decoration:none;color:var(--hero-muted);font-size:.95rem}
.nav nav a:hover{color:#fff}
.nav nav a.btn{color:#06202a}
.nav nav a.lang{font-weight:650;border:1px solid rgba(255,255,255,.25);border-radius:8px;padding:.2em .55em;font-size:.85rem}

.btn{display:inline-block;background:var(--accent);color:#06202a;text-decoration:none;font-weight:650;padding:.8em 1.3em;border-radius:10px;border:1px solid transparent;transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px);background:#5eead4}
.btn-sm{padding:.45em .9em;font-size:.9rem}
.btn-ghost{background:transparent;color:var(--hero-text);border-color:rgba(255,255,255,.25)}
.btn-ghost:hover{background:rgba(255,255,255,.08)}

.hero{background:radial-gradient(1000px 500px at 85% 20%,rgba(45,212,191,.16),transparent 60%),radial-gradient(800px 400px at 10% 100%,rgba(96,165,250,.14),transparent 60%),var(--hero);color:var(--hero-text);padding-block:88px 96px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero .eyebrow{color:var(--accent)}
.lead{font-size:1.15rem;color:var(--hero-muted);max-width:560px;margin:0 0 2rem}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-art svg{width:100%;height:auto;max-width:440px;display:block;margin-left:auto}
.node rect{fill:rgba(255,255,255,.05);stroke:rgba(255,255,255,.22)}
.node text{fill:var(--hero-text);font:600 12px system-ui,sans-serif;text-anchor:middle}
.node.core rect{fill:rgba(45,212,191,.14);stroke:var(--accent)}

.section{padding-block:88px}
.section.alt{background:var(--bg-alt)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:2rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px}
.card p{color:var(--muted);margin:0 0 1rem}
.card.plain p{margin:0}
.card ul{margin:0;padding-left:1.1rem;color:var(--text)}
.card li{margin:.3rem 0;font-size:.95rem}
.icon{width:44px;height:44px;border-radius:12px;background:rgba(45,212,191,.14);display:grid;place-items:center;margin-bottom:16px}
.icon svg{width:24px;height:24px;fill:none;stroke:var(--accent-ink);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

.steps{list-style:none;padding:0;margin:2rem 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.steps li{border-top:2px solid var(--accent);padding-top:18px}
.steps span{font-weight:750;color:var(--accent-ink);font-size:.9rem}
.steps h3{margin-top:.4rem}
.steps p{color:var(--muted);margin:0;font-size:.95rem}

.stack{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stack div{border:1px solid var(--line);border-radius:14px;padding:20px;background:var(--card)}
.stack p{margin:0;color:var(--muted);font-size:.95rem}

.contact{background:var(--hero);color:var(--hero-text)}
.contact .eyebrow{color:var(--accent)}
.contact .sub{color:var(--hero-muted)}
.contact-inner{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.contact-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:28px}
.label{margin:0 0 .3rem;color:var(--hero-muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.1em}
.email{font-size:1.15rem;font-weight:650;color:var(--accent);word-break:break-all}
.hint{color:var(--hero-muted);font-size:.9rem;margin:1rem 0 0}

.footer{background:#050d17;color:var(--hero-muted);font-size:.9rem}
.footer-inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-block:24px}

@media (max-width:900px){
  .hero-grid,.contact-inner{grid-template-columns:1fr}
  .hero-art{display:none}
  .cards,.cards.three{grid-template-columns:1fr}
  .steps,.stack{grid-template-columns:1fr 1fr}
  .hero{padding-block:64px 72px}
  .section{padding-block:64px}
}
@media (max-width:560px){
  .steps,.stack{grid-template-columns:1fr}
  .nav nav{gap:14px}
  .nav nav a:not(.btn):not(.lang){display:none}
}