body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #0e0e0e;
  color: #f1f1f1;
  text-align: center;
}

header {
  padding: 60px 20px;
  background: linear-gradient(135deg, #000, #1c1c1c);
}

header h1 {
  font-size: 2.4rem;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 14px 28px;
  background: #25d366;
  color: #000;
  font-weight: bold;
  text-decoration: none;
  border-radius: 8px;
}

.features {
  padding: 40px 20px;
  background: #121212;
  display: grid;
  gap: 15px;
}

.plans {
  padding: 50px 20px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin: auto;
}

.card {
  background: #1a1a1a;
  padding: 30px;
  border-radius: 12px;
  font-size: 1.2rem;
}

footer {
  padding: 20px;
  background: #000;
  font-size: 0.9rem;
  opacity: 0.7;
}