/* General Styles */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Header */
header {
  background-color: #333;
  color: #fff;
  padding: 20px 0;
}

header h1 {
  margin: 0;
  text-align: center;
}

header nav ul {
  list-style: none;
  padding: 0;
  text-align: center;
}

header nav ul li {
  display: inline;
  margin: 0 15px;
}

header nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

/* Main Content */
main {
  padding: 20px 0;
}

#calculator {
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

#calculator h2 {
  margin-top: 0;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input {
  width: 100%;
  padding: 8px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  width: 100%;
  padding: 10px;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #555;
}

#result {
  margin-top: 20px;
}

#how-to-use {
  margin-top: 40px;
}

/* Footer */
footer {
  background-color: #333;
  color: #fff;
  padding: 20px 0;
  text-align: center;
}

footer nav ul {
  list-style: none;
  padding: 0;
}

footer nav ul li {
  display: inline;
  margin: 0 15px;
}

footer nav ul li a {
  color: #fff;
  text-decoration: none;
}