/* auth.css - 登录验证码样式优化版（支持数学公式验证） */
.auth-box {
  text-align: center;
  max-width: 400px;
  margin: 100px auto;
  padding: 2rem;
  border: 1px solid #ccc;
  border-radius: 12px;
  background-color: #f9f9f9;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  box-sizing: border-box;
}

.auth-box h2 {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  font-weight: bold;
  color: #222;
}

.auth-box .math-question {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.auth-box input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  margin-bottom: 1rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  box-sizing: border-box;
  height: 44px;
}

.auth-box input.invalid {
  border-color: red;
}

.auth-box button {
  width: 100%;
  height: 44px;
  font-size: 1rem;
  background-color: #0066cc;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  box-sizing: border-box;
  transition: background-color 0.2s ease;
}

.auth-box button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.auth-box button:hover:not(:disabled) {
  background-color: #004c99;
}

.auth-box button:focus {
  outline: 2px solid #0066cc;
  outline-offset: 2px;
}

.auth-box .error {
  color: red;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.auth-box input {
  font-size: small;
}

@media (max-width: 768px) {
  .auth-box {
    margin: 60px 16px;
    padding: 1.5rem;
    max-width: 100%;
    border-radius: 8px;
  }

  .auth-box h2 {
    font-size: 1.2rem;
  }

  .auth-box input,
  .auth-box button {
    font-size: 1rem;
    height: 44px;
  }
}