:root{
  --bg:#0d0d11;
  --fg:#e8e8f0;
  --accent1:#8a2be2;
  --accent2:#00d1ff;
  --gradient:linear-gradient(120deg,var(--accent1),var(--accent2));
  --radius:12px;
}
*{margin:0;padding:0;box-sizing:border-box;}
body{
  font-family:'Open Sans',sans-serif;
  color:var(--fg);
  background:var(--bg);
  line-height:1.6;
  scroll-behavior:smooth;
}
h1,h2,h3{
  font-family:'Inter',sans-serif;
  font-weight:600;
}
.grad-heading{
  background:var(--gradient);
  -webkit-background-clip:text;
  background-clip: text;
  -webkit-text-fill-color:transparent;
  background-size:200%;
  animation:gradientMove 6s ease infinite alternate;
}
@keyframes gradientMove{to{background-position:200% center}}
header#hero{
  position:relative;
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  overflow:hidden;
}
#particles-js{position:absolute;top:0;left:0;width:100%;height:100%;}
.hero-content{position:relative;max-width:760px;padding:0 1rem;z-index:1;}
.hero-content p{margin:1rem 0 2rem;font-size:1.1rem;}
.btn{
  background:var(--gradient);
  border:none;
  padding:0.8rem 2.2rem;
  font-size:1rem;
  border-radius:var(--radius);
  cursor:pointer;
  color:#fff;
  transition:opacity .3s;
}
.btn:hover{opacity:.8}
section{padding:4rem 1.2rem;max-width:1000px;margin:auto;}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:1.5rem;
  margin-top:2rem;
}
.tile{
  background:#15151e;
  border-radius:var(--radius);
  padding:2rem 1.2rem;
  text-align:center;
  transition:transform .3s;
}
.tile i{font-size:2rem;margin-bottom:1rem;color:var(--accent2)}
.tile:hover{transform:translateY(-6px);}
ul,ol{margin-left:1.2rem;margin-top:1rem;}
li{margin-bottom:.6rem;}
.social a{
  color:var(--fg);
  font-size:1.6rem;
  margin-right:1rem;
  transition:color .3s;
}
.social a:hover{color:var(--accent2);}
/* Fade-in intersection */
.observe{opacity:0;transform:translateY(20px);transition:all .6s ease;}
.observe.visible{opacity:1;transform:none;}
/* Responsive tweaks */
@media(max-width:600px){
  h1{font-size:1.9rem}
  .hero-content p{font-size:1rem}
}
footer {
  color: #1a1a1a;
  font-family: 'Open Sans', sans-serif;
}

footer a {
  color: #4F46E5;
  font-weight: 600;
  transition: color 0.2s ease;
}

footer a:hover {
  color: #4338CA;
}