:root{
  --bg:#0b0f19;
  --panel:rgba(18,26,43,.85);
  --text:#e8eefc;
  --muted:#b7c3e0;
  --brand:#7c5cff;
  --brand2:#22c55e;
  --border:rgba(255,255,255,.10);
  --shadow:0 25px 70px rgba(0,0,0,.45);
  --radius:18px;
  --max:1120px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

[data-theme="light"]{
  --bg:#f7f8fc;
  --panel:rgba(255,255,255,.92);
  --text:#111827;
  --muted:#4b5563;
  --border:rgba(17,24,39,.12);
  --shadow:0 18px 50px rgba(17,24,39,.15);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  background:
    radial-gradient(900px 600px at 15% 5%, rgba(124,92,255,.25), transparent 60%),
    radial-gradient(800px 600px at 85% 10%, rgba(34,197,94,.18), transparent 55%),
    var(--bg);
  color:var(--text);
  line-height:1.55;
}

a{text-decoration:none;color:inherit}
.container{max-width:var(--max);margin:0 auto;padding:0 18px}

/* NAV */
header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(12px);
  background:color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 0;gap:14px;
  position:relative;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.logo{
  width:36px;height:36px;border-radius:12px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  box-shadow:var(--shadow);
}

.nav-links{display:flex;gap:14px;align-items:center}
.nav-links a{
  color:var(--muted);
  padding:8px 10px;border-radius:12px;
  transition:.2s;
}
.nav-links a:hover,
.nav-links a.active{
  color:var(--text);
  background:rgba(255,255,255,.06);
}

.navToggle{
  display:none;background:transparent;
  border:1px solid var(--border);
  border-radius:12px;padding:10px;
  cursor:pointer;
}
.navToggle span{display:block;width:18px;height:2px;background:var(--text);margin:4px 0}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 14px;border-radius:14px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.06);
  cursor:pointer;font-weight:600;
  transition:.2s;
  user-select:none;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#0b0f19;border:none;
}

/* LAYOUT */
section{padding:32px 0}
.grid-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:24px}

.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px;
  transition:.25s;
}
.card:hover{transform:translateY(-4px)}

h1{font-size:clamp(34px,4vw,56px);margin:0 0 10px}
.subtitle{color:var(--muted);font-size:17px;margin:0}

.pill-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.pill{
  padding:7px 12px;border-radius:999px;
  border:1px solid var(--border);
  font-size:13px;color:var(--muted);
  background:rgba(255,255,255,.03);
}

.section-title{
  display:flex;justify-content:space-between;gap:16px;
  margin-bottom:14px;align-items:flex-end;
}
.section-title h2{margin:0}
.section-title p{margin:0;color:var(--muted)}

.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}

.item{
  padding:16px;border-radius:var(--radius);
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  transition:.25s;
}
.item:hover{transform:translateY(-4px)}
.item h3{margin:0 0 6px;font-size:16px}
.item p{margin:0;color:var(--muted);font-size:14px}

.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.tag{
  font-size:12px;padding:5px 8px;
  border-radius:999px;border:1px solid var(--border);
  color:var(--muted);
  background:rgba(255,255,255,.02);
}

/* HERO IMAGE */
.hero-image{
  display:flex;
  align-items:center;
  justify-content:center;
  background:
    radial-gradient(circle at center, rgba(124,92,255,.16), rgba(0,0,0,.75));
  overflow:hidden;
}
.hero-image img{
  max-width:65%;
  height:auto;
  opacity:.55;
  filter:drop-shadow(0 30px 90px rgba(0,0,0,.9));
  transition:.35s ease;
}
.hero-image img:hover{
  opacity:.72;
  transform:scale(1.03);
}

/* Reveal + BackTop */
.reveal{opacity:0;transform:translateY(16px)}
.reveal.in{opacity:1;transform:none;transition:.6s}

.backTop{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:9999;              /* 🔥 REQUIRED */
  opacity:0;
  pointer-events:none;
  transition:.3s ease;
}

.backTop.show{
  opacity:1;
  pointer-events:auto;
}


footer{
  border-top:1px solid var(--border);
  padding:30px 0 44px;
  color:var(--muted);
}

/* Mobile */
@media(max-width:920px){
  .grid-hero,.grid-2{grid-template-columns:1fr}
  .hero-image{display:none}

  .navToggle{display:block}
  .nav-links{
    display:none;
    position:absolute;right:0;top:58px;
    flex-direction:column;
    background:var(--panel);
    border:1px solid var(--border);
    border-radius:16px;
    padding:12px;
    min-width:210px;
  }
  .nav-links.open{display:flex}
}