:root {
    --c-brand: #4799fc;
    --c-brand-light: #67abfd;
  
    --c-text: rgb(30, 30, 30); // normal text
    --c-text-light: rgb(30, 30, 30);
    --c-text-lighter: rgb(30, 30, 30); // code block text
    --c-text-lightest: rgba(30, 30, 30, 0.7);
  
    .custom-container.tip {
      color: rgb(57, 146, 255) !important;
      border-color: rgb(57, 146, 255) !important;
      background-color: rgba(57, 146, 255, 0.1) !important;
    }
  
    .custom-container.warning {
      color: rgb(39, 31, 6) !important;
      border-color: rgb(39, 31, 6) !important;
      background-color: rgba(131, 122, 11, 0.15) !important;
    }
  
    .custom-container.danger {
      color: rgb(170, 37, 58) !important;
      border-color: rgb(170, 37, 58) !important;
      background-color: rgba(170, 37, 58, 0.1) !important;
    }
  }
  
  html.dark {
    --c-brand: #67abfd;
    --c-brand-light: #4799fc;
  
    --c-bg: rgb(18, 18, 18);
    --c-bg-light: rgb(30, 30, 30); // code block background
    --code-bg-color: #1e1e1e; // code background
  
    --c-text: rgb(183, 188, 190); // normal text
    --c-text-light: rgba(183, 188, 190);
    --c-text-lighter: rgb(183, 188, 190); // code block text
    --c-text-lightest: rgba(183, 188, 190, 0.7);
  
    --c-border: rgb(45, 45, 45);
    --c-border-dark: rgb(60, 60, 60);
  
    .custom-container.tip {
      color: rgb(57, 146, 255) !important;
      border-color: rgb(57, 146, 255) !important;
      background-color: rgba(57, 146, 255, 0.1) !important;
    }
  
    .custom-container.warning {
      color: rgb(248, 239, 159) !important;
      border-color: rgb(248, 239, 159) !important;
      background-color: rgba(131, 122, 11, 0.15) !important;
    }
  
    .custom-container.danger {
      color: rgb(240, 158, 183) !important;
      border-color: rgb(240, 158, 183) !important;
      background-color: rgba(240, 158, 183, 0.1) !important;
    }
  }
  
  h1 {
    font-family: "Montserrat", sans-serif;
  
    font-size: 38px;
    @media (min-width: 750px) {
      font-size: 55px;
    }
  }
  
  h2 {
    font-family: "Montserrat", sans-serif;
    font-size: 27px;
    @media (min-width: 750px) {
      font-size: 38px;
    }
  }
  
  h3 {
    font-family: "Montserrat", sans-serif;
    font-size: 20px;
    @media (min-width: 750px) {
      font-size: 27px;
    }
  }
  
  h4 {
    font-family: "Montserrat", sans-serif;
    font-size: 16px;
  }
  
  mark {
    padding: 2px;
  }
  
  .action-button.primary {
    font-weight: 800;
  }
  
  summary {
    cursor: pointer;
  }
  
  details[open] summary {
    margin-bottom: 0.5rem;
  }
  
  .custom-container {
    border-radius: 10px;
    border-left-width: 0.25rem !important;
    border-left-style: solid;
    border-right-style: solid;
    border-right-width: 0.25rem;
  }
  
  .custom-container-title {
    display: none;
  }
  
  .video-block {
    position: relative; 
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    width: 100%; height: auto;
  }
  
  .video-block iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
  }