.utm-builder {
  color: #333;
  font-family: Arial, sans-serif;
  margin: 0 auto;
  max-width: 800px;
  padding: 20px;
}
h1 {
  color: #2c3e50;
  font-size: 2.5rem;
}
h2 {
  font-size: 1.8rem;
  margin-top: 20px;
}
h3 {
  font-size: 1.4rem;
}
p {
  line-height: 1.6;
}
.utm-form {
  gap: 15px;
  margin: 20px 0;
}
.utm-form,
label {
  display: flex;
  flex-direction: column;
}
label {
  font-weight: 700;
}
.required {
  color: #e74c3c;
  display: contents;
}
input {
  border: 1px solid #ddd;
  border-radius: 4px;
  margin-top: 5px;
  padding: 10px;
}
button,
input {
  font-size: 1rem;
}
button {
  background-color: #3498db;
  border: none;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
  padding: 10px 20px;
}
button:hover {
  background-color: #2980b9;
}
.generated-url-section {
  background-color: #f9f9f9;
  border-radius: 4px;
  margin-top: 20px;
  padding: 15px;
}
.generated-url-section p {
  color: #27ae60;
  word-break: break-all;
}
.cta,
.instructions {
  margin-top: 30px;
}
a {
  color: #3498db;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
@media (max-width: 600px) {
  .utm-builder {
    padding: 10px;
  }
  h1 {
    font-size: 2rem;
  }
  button,
  input {
    font-size: 0.9rem;
  }
}
.error-message {
  color: red;
  display: block;
  font-size: 0.9em;
  margin-top: 5px;
}
.copied-message {
  color: green;
  font-size: 0.9em;
  margin-left: 10px;
  opacity: 1;
  transition: opacity 0.5s ease-in-out;
}