style.css

/* Reset and Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #001f3f; /* Dark blue */
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow-y: auto; /* Allow vertical scrolling */
  padding: 20px;
}

.container {
  background: #fff;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 100%;
  max-width: 600px;
  text-align: center;
  color: #333;
}

header h1 {
  margin-bottom: 20px;
}

label {
  display: block;
  margin: 15px 0 5px;
  font-weight: bold;
  font-size: 14px;
}

input, select {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
}

button {
  background-color: #87CEFA; /* Sky Blue */
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 16px;
  color: white;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #5faad7; /* Darker blue */
}

#swapButton {
  background: #87CEFA;
  color: white;
  margin: 10px auto;
  display: block;
  width: auto;
}

#result {
  margin-top: 20px;
  font-size: 18px;
  font-weight: bold;
  color: #001f3f;
  background-color: #f0f0f0;
  padding: 15px;
  border-radius: 8px;
}

footer {
  margin-top: 20px;
  font-size: 14px;
  color: #ccc;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .container {
    padding: 30px;
  }

  button {
    font-size: 14px;
  }
}