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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #001f3f, #0074D9);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 500px;
  width: 100%;
}

.card {
  background: rgba(0, 47, 95, 0.95);
  border-radius: 20px;
  padding: 30px 20px;
  box-shadow: 0 0 20px rgba(0,0,0,0.6);
  text-align: center;
}

.card h1 {
  font-size: 2rem;
  margin-bottom: 10px;
  color: #00ffff;
}

.card h2 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: #7FDBFF;
}

.card p {
  font-size: 1rem;
  margin-bottom: 20px;
}

.countdown h3 {
  margin-bottom: 5px;
  color: #ffdc00;
}

#timer {
  font-size: 1.3rem;
  font-weight: bold;
  color: #ff851b;
  margin-bottom: 20px;
}

.btn {
  display: inline-block;
  background-color: #0074D9;
  color: #fff;
  padding: 12px 25px;
  border-radius: 30px;
  font-weight: bold;
  text-decoration: none;
  transition: background 0.3s ease;
}

.btn:hover {
  background-color: #005fa3;
}

/* Responsive Design */
@media (max-width: 480px) {
  .card {
    padding: 20px 15px;
  }

  .card h1 {
    font-size: 1.5rem;
  }

  .card h2 {
    font-size: 1.2rem;
  }

  #timer {
    font-size: 1.1rem;
  }
}