/* Khối form */
#registerForm {
  max-width: 700px;
  margin: 30px auto;
  padding: 24px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.08);
}

/* Tiêu đề */
h2 {
  text-align: center;
  font-size: 24px;
  margin-bottom: 15px;
  color: #2e1b4d;
}

/* Form group */
.form-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
}

/* Label */
.form-group label {
  font-weight: 600;
  margin-bottom: 6px;
  color: #333;
}

/* Input, select, textarea */
.form-group input,
.form-group select,
.form-group textarea {
  padding: 10px 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 15px;
  transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: #ff6600;
  box-shadow: 0 0 0 2px rgba(255,102,0,0.2);
  outline: none;
}

/* Textarea */
.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

/* Button */
#submitBtn {
  background: #ff6600;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.25s ease;
}

#submitBtn:hover {
  background: #e65c00;
}

/* Responsive */
@media (max-width: 600px) {
  #registerForm {
    padding: 16px;
  }
}