body {
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background-color: #f4f4f4;
  color: #222;
  margin: 0;
  padding: 100px 20px 40px;
}

main {
  max-width: 650px;
  margin: 0 auto;
  background: #fff;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.1);
  text-align: center;
}

main h1 {
  font-size: 1.8rem;
  margin-bottom: 25px;
  color: #0078d4;
}

form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  text-align: left;
}

label {
  font-weight: 600;
  margin-bottom: 5px;
}

input,
textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus,
textarea:focus {
  border-color: #0078d4;
  box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.2);
  outline: none;
}

.error {
  color: #c0392b;
  font-size: 0.9rem;
  margin-top: 4px;
  min-height: 18px;
  display: block;
  opacity: 0;
  transition: opacity 0.3s ease-in;
}

.error.active {
  opacity: 1;
}

.success {
  color: #27ae60;
  font-weight: bold;
  margin-top: 10px;
  opacity: 0;
  transition: opacity 0.5s ease-in;
}

button {
  background-color: #0078d4;
  color: #fff;
  padding: 12px 18px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: background-color 0.3s, transform 0.2s;
}

button:hover {
  background-color: #005fa3;
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  main {
    padding: 25px;
  }

  input,
  textarea {
    font-size: 0.95rem;
  }
}