/* 针对手机屏幕 */
@media only screen and (max-width: 767px) {
  .pc {
    display: none !important;
  }

  .mobile {
    display: block !important;
  }

  .footer-section {
    font-size: 10px;
  }

  .header-section.header-fixed {
    background-color: transparent;
    box-shadow: none;
  }

  .header-section .navbar .navbar-brand {
    display: none;
  }

  .header-section {
    background-color: transparent;
    box-shadow: none;
  }

  .header-section .navbar {
    display: flex;
    justify-content: flex-end;
  }
  .header-section .navbar-toggler {
    background-color: #000000;
    padding: 10px;
    border-radius: 50% !important;
    -webkit-border-radius: 50% !important;
    -moz-border-radius: 50% !important;
    -ms-border-radius: 50% !important;
    -o-border-radius: 50% !important;
  }

  .navbar-mobile {
    display: none !important;
  }

  #overlay {
    background-color: rgba(0, 0, 0, 0.9);
    color: #ffffff;
    min-height: 100vh;
  }

  .overlay-nav a {
    color: #ffffff;
  }

  .nav-link {
    line-height: 35px;
    text-align: center;
  }

  .overlay-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .footer-section {
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 20px;
  }
}

/* 针对平板屏幕 */
@media only screen and (min-width: 768px) and (max-width: 1023px) {
  /* 在这里写平板的样式 */
  .pc {
    display: none !important;
  }

  .mobile {
    display: block !important;
  }

  .footer-section {
    font-size: 10px;
  }

  .header-section.header-fixed {
    background-color: transparent;
    box-shadow: none;
  }

  .header-section .navbar .navbar-brand {
    display: none;
  }

  .header-section {
    background-color: transparent;
    box-shadow: none;
  }

  .header-section .navbar {
    display: flex;
    justify-content: flex-end;
  }
  .header-section .navbar-toggler {
    background-color: #000000;
    padding: 10px;
    border-radius: 50% !important;
    -webkit-border-radius: 50% !important;
    -moz-border-radius: 50% !important;
    -ms-border-radius: 50% !important;
    -o-border-radius: 50% !important;
  }

  .navbar-mobile {
    display: none !important;
  }

  #overlay {
    background-color: rgba(0, 0, 0, 0.9);
    color: #ffffff;
    min-height: 100vh;
  }

  .overlay-nav a {
    color: #ffffff;
  }

  .nav-link {
    line-height: 35px;
    text-align: center;
  }

  .overlay-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
}

/* 针对电脑屏幕 */
@media only screen and (min-width: 1024px) {
  /* 在这里写电脑的样式 */
}