body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background-color: #f5f5f5;
  color: #333;
}
header {
  text-align: center;
  background-color: #333;
  color: #fff;
  padding: 30px 15px;
}
main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  padding: 20px;
}
.tool-card {
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.tool-card h2 {
  margin-top: 0;
}
.btn {
  display: inline-block;
  margin-top: 10px;
  padding: 8px 16px;
  background-color: #4682b4;
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
}
.btn:hover {
  background-color: #315f86;
}
footer {
  text-align: center;
  padding: 20px;
  background-color: #333;
  color: #fff;
  margin-top: 40px;
}
.disabled {
    cursor: not-allowed;
    opacity: 0.6;
}