:root {
    --primary-color: #333;
    --secondary-color: #444;
    --ternary-color: #555;
    --light-color: #ccc;
    --light-secondary-color: #ddd;
    --light-ternary-color: #eee;
    --overlay-color: rgba(0, 0, 0, 0.7);
  }
  
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    padding-top: 60px; /* 根据导航栏高度调整 */
    font-family: "Catamaran", sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    font-size: 1.1rem;
  }
  
  /* footer */
  
  .section-footer {
    background-color: var(--primary-color);
    color: #fff;
    padding: 4rem 0;
  }
  
  .section-footer .container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }
  
  .section-footer h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
  }
  
  .section-footer h3 {
    margin-bottom: 0.7rem;
  }
  
  .section-footer a {
    line-height: 1.9;
    color: var(--light-color);
  }
  
  .section-footer a > i {
    color: var(--ternary-color);
    margin-right: 0.5rem;
  }
  
  .email-form {
    display: inline-block;
    width: 100%;
    background-color: var(--ternary-color);
    position: relative;
    border-radius: 20px;
    line-height: 0;
    margin-top: 1rem;
  }
  
  .email-form .form-control {
    display: inline-block;
    width: 100%;
    height: 45px;
    border-radius: 20px;
    border: 0;
    outline: 0;
    font-size: 1rem;
    color: var(--light-secondary-color);
    background-color: transparent;
    font-family: inherit;
    margin: 0;
    padding: 0 3rem 0 1.5rem;
  }
  
  .email-form .submit {
    display: inline-block;
    position: absolute;
    top: 0;
    right: 0;
    width: 45px;
    height: 45px;
    background-color: var(--light-ternary-color);
    font-size: 1rem;
    text-align: center;
    margin: 0;
    padding: 0;
    outline: 0;
    border: 0;
    border-radius: 0 20px 20px 0;
    color: var(--primary-color);
    cursor: pointer;
  }
  
  @media (max-width: 768px) {
    .section-showcase .container {
      grid-template-columns: 1fr;
      text-align: center;
    }
    .section-footer {
      padding: 2rem 0;
    }
  
    .section-footer .container {
      grid-template-columns: 1fr;
      text-align: center;
    }
  
    .section-footer div:nth-child(2),
    .section-footer div:nth-child(3) {
      display: none;
    }
  }