/* 导航 active 状态 */
nav a.active {
  color: #1d6fa5;
  text-decoration: underline;
  font-weight: 700;
}

/* 联系表单样式 */
form {
  max-width: 600px;
  margin: 0 auto 60px auto;
  background: #fff;
  padding: 20px 30px;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #2c3e50;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 20px;
  border: 1.5px solid #ccc;
  border-radius: 8px;
  font-size: 1.05rem;
  box-sizing: border-box;
  transition: border-color 0.3s ease;
  font-family: inherit;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
  border-color: #3498db;
  outline: none;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

button {
  background-color: #3498db;
  color: white;
  padding: 12px 26px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #1d6fa5;
}

@media (max-width: 600px) {
  form {
    padding: 15px 20px;
  }
}