:root{
  --bg:#0b0b0b;
  --bg2:#141414;
  --text:#f5f5f5;
  --muted:#b5b5b5;
  --accent:#d9d9d9;
  --border:#2d2d2d;
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
}

body{
  font-family:Arial, Helvetica, sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}

header{
  position:fixed;
  top:0;
  width:100%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:20px 60px;
  background:rgba(10,10,10,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}

.logo{
  font-size:1.8rem;
  font-weight:700;
  letter-spacing:4px;
}

nav a{
  color:var(--text);
  text-decoration:none;
  margin-left:28px;
  transition:.3s;
}

nav a:hover{
  color:#ffffff;
  opacity:.7;
}

.hero{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  text-align:center;
  padding:120px 20px;
  background:
    linear-gradient(rgba(0,0,0,.65),rgba(0,0,0,.85)),
    radial-gradient(circle at top,#333 0%,#0b0b0b 70%);
}

.hero h1{
  font-size:4rem;
  margin-bottom:20px;
  text-transform:uppercase;
  letter-spacing:3px;
}

.hero p{
  color:var(--muted);
  max-width:700px;
  margin-bottom:35px;
  font-size:1.2rem;
}

.btn{
  display:inline-block;
  padding:16px 36px;
  border:2px solid #fff;
  color:#fff;
  text-decoration:none;
  border-radius:40px;
  transition:.3s;
}

.btn:hover{
  background:#fff;
  color:#000;
}

section{
  padding:100px 10%;
}

h2{
  font-size:2.5rem;
  margin-bottom:40px;
}

.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:30px;
}

.cards article{
  background:var(--bg2);
  border:1px solid var(--border);
  border-radius:18px;
  padding:30px;
  transition:.3s;
}

.cards article:hover{
  transform:translateY(-8px);
}

ul{
  margin-left:20px;
}

footer{
  padding:40px;
  text-align:center;
  border-top:1px solid var(--border);
  color:var(--muted);
}

@media(max-width:768px){
  header{
    flex-direction:column;
    gap:15px;
    padding:20px;
  }

  nav a{
    margin:0 10px;
  }

  .hero h1{
    font-size:2.5rem;
  }

  section{
    padding:80px 24px;
  }
}