/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f8f9fa;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* Container styles */
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

/* Card styles */
.card {
  background-color: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  text-align: center;
  max-width: 400px;
  width: 100%;
}

/* Heading styles */
.card h1 {
  color: #333;
  margin-bottom: 20px;
  font-size: 24px;
  font-weight: bold;
}

/* Paragraph styles */
.card p {
  color: #666;
  margin-bottom: 30px;
  font-size: 16px;
  line-height: 1.5;
}

/* Button styles */
.open-btn {
  background-color: #007bff;
  color: white;
  border: none;
  padding: 16px 32px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  font-weight: bold;
  width: 100%;
  transition: background-color 0.2s ease;
}

.open-btn:hover {
  background-color: #0056b3;
}

.open-btn:active {
  background-color: #004085;
  transform: translateY(1px);
}

/* Responsive design */
@media (max-width: 480px) {
  .container {
    padding: 10px;
  }
  
  .card {
    padding: 30px 20px;
  }
  
  .card h1 {
    font-size: 20px;
  }
  
  .card p {
    font-size: 14px;
  }
  
  .open-btn {
    padding: 14px 28px;
    font-size: 16px;
  }
}