.invoice-section {
    padding: 48px 0 80px;
  }
  .invoice-card {
    max-width: 680px;
    margin: 0 auto;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 40px 36px;
    box-shadow: 0 8px 32px rgba(20, 40, 60, .06);
  }
  .invoice-card h2 {
    font-size: 26px;
    letter-spacing: -.4px;
    margin-bottom: 28px;
    text-align: center;
    color: var(--ink);
  }
  .form-group {
    margin-bottom: 20px;
  }
  .form-group label {
    display: block;
    font-weight: 600;
    font-size: 15px;
    color: var(--ink);
    margin-bottom: 6px;
  }
  .form-group label .required {
    color: #e53e3e;
    margin-left: 2px;
  }
  .form-group input[type="email"],
  .form-group input[type="text"],
  .form-group input[type="tel"],
  .form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--line);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--ink);
    background: #fff;
    transition: border-color .2s, box-shadow .2s;
    outline: none;
  }
  .form-group input:focus,
  .form-group select:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(0, 155, 247, .12);
  }
  .form-group input::placeholder {
    color: #a0aec0;
  }
  .form-hint {
    font-size: 13px;
    color: var(--muted);
    margin-top: 5px;
    line-height: 1.5;
  }
  .form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235b6b7b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 44px;
    cursor: pointer;
  }
  .invoice-submit {
    width: 100%;
    justify-content: center;
    margin-top: 12px;
    padding: 14px 30px;
    font-size: 17px;
  }
  /* 公司字段区域默认隐藏 */
  #company-fields {
    display: none;
  }
  #company-fields.visible {
    display: block;
  }
  /* 响应式 */
  @media (max-width: 768px) {
    .invoice-section {
      padding: 32px 0 56px;
    }
    .invoice-card {
      padding: 28px 20px;
      border-radius: 10px;
    }
    .invoice-card h2 {
      font-size: 22px;
    }
  }