:root{
  --ink:#0B0F17;
  --panel:#121826;
  --panel-2:#0F1623;
  --brand:#2563EB;
  --brand-2:#3B82F6;
  --accent:#F59E0B;
  --text:#E5E7EB;
  --muted:#9CA3AF;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:'Inter','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
/* Tech grid + subtle glow backdrop */
.bg-grid{
  position:fixed;
  inset:0;
  z-index:-1;
  background-image:
    linear-gradient(rgba(37,99,235,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,.06) 1px, transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
}
.bg-glow{
  position:fixed;
  top:-200px;left:50%;
  width:900px;height:600px;
  transform:translateX(-50%);
  background:radial-gradient(circle, rgba(37,99,235,.18), transparent 60%);
  z-index:-1;
  pointer-events:none;
}
a{color:inherit;text-decoration:none}
.mono{font-family:'JetBrains Mono','SFMono-Regular',Consolas,monospace;letter-spacing:.02em}
.eyebrow{
  font-family:'JetBrains Mono','SFMono-Regular',Consolas,monospace;
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--brand-2);
}
.text-muted{color:var(--muted)}
.text-accent{color:var(--accent)}
.container{max-width:1160px;margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section-sm{padding:64px 0}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.8rem 1.5rem;border-radius:.6rem;font-weight:600;font-size:.95rem;
  transition:.2s ease;cursor:pointer;border:1px solid transparent;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 30px rgba(37,99,235,.35)}
.btn-primary:hover{background:var(--brand-2);transform:translateY(-2px)}
.btn-ghost{border-color:var(--line-strong);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--brand-2);color:#fff}

/* Cards */
.card{
  background:linear-gradient(180deg,var(--panel),var(--panel-2));
  border:1px solid var(--line);
  border-radius:1rem;
  padding:1.75rem;
  transition:.25s ease;
}
.card:hover{border-color:rgba(37,99,235,.5);transform:translateY(-4px);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.card .ico{
  width:46px;height:46px;border-radius:.7rem;
  display:grid;place-items:center;margin-bottom:1rem;
  background:rgba(37,99,235,.12);color:var(--brand-2);
  border:1px solid rgba(37,99,235,.3);
}

/* Header / Nav */
.site-header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(140%) blur(12px);
  background:rgba(11,15,23,.72);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:700;letter-spacing:.04em}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--brand);box-shadow:0 0 12px var(--brand)}
.nav-links{display:flex;gap:2rem;align-items:center}
.nav-links a{color:var(--muted);font-size:.92rem;transition:.2s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-toggle{display:none;background:none;border:1px solid var(--line-strong);border-radius:.5rem;padding:.4rem .6rem;color:var(--text);cursor:pointer}
.mobile-menu{display:none;flex-direction:column;gap:.25rem;padding:1rem 0;border-top:1px solid var(--line)}
.mobile-menu a{padding:.7rem 0;color:var(--muted)}
.mobile-menu a.active{color:#fff}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:48px 0 32px;color:var(--muted);font-size:.88rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
.footer-grid a{color:var(--muted)}
.footer-grid a:hover{color:#fff}
.footer-bottom{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem}

/* Hero */
.hero{padding:120px 0 96px;position:relative}
.hero h1{font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.15;font-weight:800;margin:.8rem 0 1.2rem}
.hero p.lead{font-size:1.15rem;color:var(--muted);max-width:620px}
.gradient-text{background:linear-gradient(90deg,#fff,var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}

/* Stats */
.stat{display:flex;flex-direction:column;gap:.2rem}
.stat .num{font-size:2rem;font-weight:800;color:#fff}
.stat .lbl{color:var(--muted);font-size:.85rem}

/* Forms */
.field{display:flex;flex-direction:column;gap:.45rem;margin-bottom:1.1rem}
.field label{font-size:.85rem;color:var(--muted)}
.field input,.field textarea,.field select{
  background:var(--panel-2);border:1px solid var(--line-strong);border-radius:.6rem;
  padding:.75rem .9rem;color:var(--text);font-size:.95rem;font-family:inherit;outline:none;
}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--brand-2);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.check{display:flex;gap:.6rem;align-items:flex-start;font-size:.82rem;color:var(--muted);margin-bottom:1.2rem}
.check input{margin-top:.2rem}
.toast{
  position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--panel);border:1px solid rgba(37,99,235,.5);color:#fff;
  padding:.9rem 1.4rem;border-radius:.6rem;opacity:0;transition:.3s;z-index:80;box-shadow:0 12px 40px rgba(0,0,0,.5)
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

.divider{height:1px;background:var(--line);margin:0}

@media(max-width:860px){
  .nav-links{display:none}
  .nav-toggle{display:block}
  .mobile-menu.open{display:flex}
  .section{padding:64px 0}
  .hero{padding:80px 0 56px}
  .footer-grid{grid-template-columns:1fr;gap:1.5rem}
}

/* ---- Tailwind-equivalent utilities (localized, no CDN) ---- */
.grid{display:grid}
.grid-cols-2{grid-template-columns:repeat(2,1fr)}
.grid-cols-3{grid-template-columns:repeat(3,1fr)}
.grid-cols-4{grid-template-columns:repeat(4,1fr)}
.gap-6{gap:1.5rem}
.gap-8{gap:2rem}
.gap-10{gap:2.5rem}
@media(min-width:768px){
  .md\:grid-cols-2{grid-template-columns:repeat(2,1fr)}
  .md\:grid-cols-3{grid-template-columns:repeat(3,1fr)}
  .md\:grid-cols-4{grid-template-columns:repeat(4,1fr)}
}
@media(min-width:1024px){
  .lg\:grid-cols-4{grid-template-columns:repeat(4,1fr)}
}