* {
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 1rem;
  background: #f4f4f4;
  color: #333;
}
main {
  max-width: 600px;
  margin: 2rem auto;
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}
h1 {
  text-align: center;
  margin-bottom: 1rem;
}
form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
input[type="text"] {
  padding: 0.75rem;
  font-size: 1.1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}
button {
  padding: 0.75rem;
  font-size: 1.1rem;
  background: #0077cc;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
button:hover {
  background: #005fa3;
}
#results {
  margin-top: 2rem;
  background: #e9f5e9;
  padding: 1rem;
  border-left: 4px solid #4caf50;
  white-space: pre-wrap;
}
#seo-text {
  margin-top: 2rem;
  font-size: 0.95rem;
}
footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}