body {
  background: radial-gradient(circle at top, #0d1117, #000);
  color: #fff;
  font-family: "Inter", sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  max-width: 600px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  color: #36a3f7;
}

.tagline {
  font-size: 1.1rem;
  margin-bottom: 25px;
  color: #ccc;
}

.join-btn {
  display: inline-block;
  background: linear-gradient(90deg, #36a3f7, #5ac8fa);
  color: #fff;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  transition: 0.3s;
}

.join-btn:hover {
  opacity: 0.9;
  transform: scale(1.03);
}