/* =====================================================
   DESIGN SYSTEM — DARK TECH
===================================================== */
:root{
  --bg:#070B12;
  --bg-gradient:
    radial-gradient(1200px 600px at 10% -10%, #0d1b2a 0%, transparent 60%),
    radial-gradient(1000px 500px at 90% 10%, #1b0f3a 0%, transparent 55%);
  --surface:#0E1624;
  --card:#121C2E;
  --text:#E5E7EB;
  --muted:#9CA3AF;
  --primary:#14B8A6;
  --accent:#7C3AED;
  --border:#1F2A44;
  --radius:18px;
  --shadow:0 12px 40px rgba(0,0,0,.55);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto;
  background:var(--bg);
  background-image:var(--bg-gradient);
  color:var(--text);
  line-height:1.6;
}

a{text-decoration:none;color:inherit}
img{max-width:100%;display:block;border-radius:14px}
.container{width:min(1120px,100% - 32px);margin:auto}
section{padding:72px 0}

/* =====================================================
   HEADER / NAV
===================================================== */
header{
  position:sticky;top:0;z-index:30;
  backdrop-filter:blur(12px);
  background:rgba(7,11,18,.85);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 0;
}
.nav-links{display:flex}
.nav-links a{
  margin-left:20px;
  color:var(--muted);
  font-weight:600;
  position:relative;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-4px;
  width:0;height:2px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  transition:.25s;
}
.nav-links a:hover::after{width:100%}

.hamburger{
  display:none;background:none;border:none;cursor:pointer;
}
.hamburger span{
  display:block;width:26px;height:2px;background:#fff;margin:6px 0;
}

/* Mobile menu */
.mobile-menu{
  position:fixed;top:0;right:0;height:100%;width:280px;
  background:var(--surface);
  padding:32px 24px;
  transform:translateX(100%);
  transition:.35s;z-index:40;
}
.mobile-menu.active{transform:translateX(0)}
.mobile-menu a{
  display:block;padding:14px 0;
  border-bottom:1px solid var(--border);
  font-weight:700;
}
.overlay{
  position:fixed;inset:0;
  background:rgba(0,0,0,.65);
  opacity:0;pointer-events:none;
  transition:.3s;z-index:35;
}
.overlay.active{opacity:1;pointer-events:auto}

/* =====================================================
   UI ELEMENTS
===================================================== */
.hero-grid{display:grid;gap:32px}
.hero h1{font-size:clamp(30px,6vw,52px);line-height:1.1}
.hero p{color:var(--muted);max-width:60ch}

.btn{
  padding:12px 18px;border-radius:14px;
  border:1px solid var(--border);
  background:var(--surface);
  font-weight:700;
  transition:.25s;
}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--accent));
  border:none;color:#fff;
}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  height:fit-content;
  padding:24px;
  box-shadow:var(--shadow);
  transition:.25s;
  margin-top: 100px;
}
.card:hover{transform:translateY(-4px)}

.about-grid{display:grid;gap:32px}

.timeline{display:grid;gap:32px;position:relative}
.timeline::before{
  content:"";position:absolute;left:10px;top:0;bottom:0;width:2px;
  background:linear-gradient(var(--primary),transparent);
}
.timeline-item{display:grid;grid-template-columns:24px 1fr;gap:20px}
.dot{width:14px;height:14px;border-radius:50%;background:var(--primary);margin-top:8px}

.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.tag{
  font-size:12px;padding:6px 10px;
  border-radius:999px;
  background:#0b1220;border:1px solid var(--border);
}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(30px);transition:.6s ease}
.reveal.active{opacity:1;transform:none}

/* Responsive */
@media(min-width:768px){
  .hero-grid{grid-template-columns:1.2fr .8fr}
  .about-grid{grid-template-columns:.8fr 1.2fr}
}
@media(max-width:768px){
  .nav-links{display:none}
  .hamburger{display:block}
}