body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #0d1117;
  color: #e6edf3;
}

.hero {
  text-align: center;
  padding: 100px 20px;
  background: linear-gradient(135deg, #00334e, #000c18);
}

.hero h1 {
  font-size: 3rem;
}

.hero p {
  font-size: 1.2rem;
  margin: 1rem 0;
}

.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  font-size: 1rem;
  background: #00aaff;
  color: white;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.3s;
}

.btn:hover {
  background: #008fcc;
}

section {
  padding: 60px 20px;
  max-width: 1000px;
  margin: auto;
}

.features h2 {
  text-align: center;
  margin-bottom: 40px;
}

.card-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: #161b22;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.3);
}

.card h3 {
  margin-top: 0;
}

footer {
  text-align: center;
  padding: 30px 20px;
  background: #0b0f14;
  font-size: 0.9rem;
}

footer a {
  color: #00aaff;
  text-decoration: none;
}