body {
  font-family: Arial, sans-serif;
  background: #f8f9fa;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 700px;
  margin: 3rem auto;
  padding: 1rem;
}

form {
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  color: #333;
}

.form-group {
  margin-bottom: 1rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: bold;
  color: #333;
}

input[type='text'],
input[type='email'],
select {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

input[type='text']:focus,
input[type='email']:focus,
select:focus {
  border-color: #28a745;
  outline: none;
}

.form-check {
  margin-bottom: 1rem;
}

.form-check input {
  margin-right: 0.5rem;
}

.btn {
  display: block;
  width: 100%;
  background: #28a745;
  color: #fff;
  padding: 0.75rem;
  font-size: 1rem;
  font-weight: bold;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover {
  background: #218838;
}

.invalid-feedback {
  display: none;
  font-size: 0.875rem;
  color: red;
  margin-top: 0.25rem;
}

.was-validated input:invalid,
.was-validated select:invalid {
  border-color: red;
}

.was-validated input:invalid ~ .invalid-feedback,
.was-validated select:invalid ~ .invalid-feedback {
  display: block;
}

/* Checkbox validation */
.was-validated input[type='checkbox']:invalid ~ .invalid-feedback {
  display: block;
}

.text-danger {
  color: red;
}

/* Success / error messages */
.message {
  margin-bottom: 1rem;
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.95rem;
  display: none;
}

.message.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.message.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}