body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
  color: #333;
}

header {
  background: #007acc;
  color: white;
  padding: 1rem;
  text-align: center;
}

h1 {
  margin: 0;
}

main {
  padding: 1.5rem;
  max-width: 600px;
  margin: auto;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.tool-card {
  display: block;
  text-align: center;
  padding: 1rem;
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  text-decoration: none;
  color: #007acc;
  font-weight: bold;
  transition: all 0.2s ease;
}

.tool-card:hover {
  background: #007acc;
  color: white;
}

form label {
  display: block;
  margin-bottom: 0.8rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.5rem;
  margin-top: 0.3rem;
  box-sizing: border-box;
}

button {
  background: #007acc;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #005fa3;
}

.result {
  margin-top: 1rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
}