/* General Styles */
body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #4caf50, #81c784);
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

/* Main Section */
main {
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 480px;
  padding: 20px;
  text-align: center;
}

/* Header */
h1 {
  font-size: 1.8rem;
  color: #2e7d32;
  margin-bottom: 20px;
}

/* Form Styling */
form {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Label */
label {
  font-size: 1rem;
  margin-bottom: 10px;
  color: #555;
}

/* Input Field */
input[type="text"] {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin-bottom: 20px;
  text-align: center;
  outline: none;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus {
  border-color: #4caf50;
  box-shadow: 0 0 5px rgba(76, 175, 80, 0.5);
}

/* Buttons */
button {
  padding: 10px 20px;
  font-size: 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin: 5px;
  transition: background 0.3s ease;
}

#check-btn {
  background-color: #4caf50;
  color: white;
}

#check-btn:hover {
  background-color: #388e3c;
}

#clear-btn {
  background-color: #f44336;
  color: white;
}

#clear-btn:hover {
  background-color: #d32f2f;
}

/* Result Output */
#results-div {
  margin-top: 40px;
  padding: 10px;
  background: #f1f8e9;
  border: 1px solid #c8e6c9;
  border-radius: 4px;
  width: 100%;
  font-size: 1.2rem;
  min-height: 1.5rem;
  color: #2e7d32;
}

#results-div.error {
  background: #ffcdd2;
  border: 1px solid #ef9a9a;
  color: #b71c1c;
}

/* Responsiveness */
@media (max-width: 600px) {
  main {
    padding: 15px;
  }

  h1 {
    font-size: 1.5rem;
  }

  button {
    width: 100%;
  }
}