/* color scheme sourced from http://khroma.co/generator/ */
:root {
    --outer-space: #33393f;
    --bright-turquoise: #2aefcb;
    --gin: #e0eae4;
    --heliotrope: #e866ec;
  }
  
  /* set content highlight color and background */
  ::selection {
    background-color: var(--bright-turquoise);
    color: var(--outer-space);
  }
  
  html {
    /* set 1rem to 10px instead of native 16px to make it easier to calculate font-size values for the rest of the page (e.g. 1.6rem is 16px, 2.0rem is 20px, etc.) */
    font-size: 62.5%;
  }
  
  body {
    /* Sans Serif font stack is implemented to help select the best font for each type of computer operating system */
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica,
      Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  
    /* set body font size to 1.75rem, which is 1.75x more than the font-size of 10px, making it 17.5px  */
    font-size: 1.75rem;
    line-height: 1.5;
    color: var(--gin);
    background-color: var(--outer-space);
  }
  
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    margin-bottom: 0.625rem;
    color: var(--heliotrope);
    font-weight: 700;
    line-height: 1.1;
  }
  
  h1 {
    /* 4rem = 40px (4 * 10px) */
    font-size: 4rem;
  }
  
  h2 {
    font-size: 3.5rem;
  }
  
  h3 {
    font-size: 3rem;
  }
  
  h4 {
    font-size: 2.5rem;
  }
  
  h5 {
    font-size: 2rem;
  }
  
  h6 {
    font-size: 1.5rem;
  }
  
  p {
    margin-bottom: 1rem;
  }
  
  code {
    /* Monospace font stack is used for our code blocks to make it look more like code */
    font-family: Consolas, 'Andale Mono WT', 'Andale Mono', 'Lucida Console',
      'Lucida Sans Typewriter', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono',
      'Liberation Mono', 'Nimbus Mono L', Monaco, 'Courier New', Courier,
      monospace;
  }
  
  header {
    width: 96%;
    margin: 0 auto;
    padding: 2.5rem;
    text-align: center;
  }
  
  header h1.page-title {
    padding: 1rem 1.2rem;
    font-size: 4.5rem;
  }
  
  main {
    width: 96%;
    margin: 2rem auto;
  }
  
  footer {
    margin: 1.5rem;
    text-align: center;
  }
  
  /* create our main grid with flexbox, use negative margins to offset the padding on the .card-column class */
  .row {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    margin-left: -1.5rem;
    margin-right: -1.5rem;
  }
  
  .justify-center {
    justify-content: center;
  }
  
  /* using a mobile-first approach, set base column width to be 100% and we'll update it using media queries for larger screen sizes */
  .card-column {
    flex: 1 0 100%;
    padding: 1.5rem;
    /* when the screen resizes, make it so our columns don't jump in size */
    transition: flex-basis 500ms linear;
    margin-bottom: 1.5rem;
  }
  
  /* make each code card a flexbox column to align and justify content within it */
  .code-card {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    min-height: 100%;
    padding: 2rem;
    color: var(--heliotrope);
  
    /* outline is like border, but on the outside of the box instead of inside */
    outline: 2px dashed var(--gin);
    outline-offset: -2px;
    transition: all 0.5s ease-in-out;
  }
  
  .code-card .card-header {
    /* use position and negative margins to move title of card over the card's outline and create an overlap effect */
    position: relative;
    margin: -4rem 0 1.5rem 0;
    padding: 0.5rem 1rem;
    background-color: var(--outer-space);
    color: var(--heliotrope);
    border: 2px solid var(--gin);
    border-radius: 8px;
    transition: all 0.5s ease-in-out;
  }
  
  /* set an outer and inner drop shadow on the card to create a glowing effect on hover */
  .code-card:hover,
  .code-card:hover .card-header {
    box-shadow: inset 0px 0px 8px var(--heliotrope), 0 0 15px var(--heliotrope);
  }
  
  /* each card's code block grows to the height of the largest code block on the page, making each card even in height */
  .code-card .code-block {
    flex-grow: 1;
  }
  
  .code-card pre {
    /* set styles to make it so code wraps in <pre> instead of overflowing */
    white-space: pre-wrap;
    overflow: auto;
    tab-size: 4;
    padding: 1.2rem 1rem;
    color: var(--gin);
    border-radius: 8px;
    /* use linear-gradient() function to create a fading background  */
    background-image: linear-gradient(
      rgba(232, 102, 236, 0.3) 0%,
      rgba(232, 102, 236, 0.6) 100%
    );
    display: flex;
    align-items: center;
  }
  
  /* on <pre> click, select all contents so the code is highlighted */
  .code-card pre:active {
    user-select: all;
  }
  
  /* using a mobile-first approach, use `min-width` values going from narrow -> wide for a responsive design */
  @media screen and (min-width: 768px) {
    /* on tablets, set columns to only be 50% of the width and not grow */
    .card-column {
      flex: 0 0 50%;
      max-width: 50%;
    }
  
    /* select the last child to grow to full width if it has space to grow */
    .card-column:last-child {
      flex-grow: 1;
    }
  }
  
  /* media query for larger screens */
  @media screen and (min-width: 992px) {
    header {
      width: 75%;
    }
  
    .card-column {
      flex: 0 0 33.333%;
      max-width: 33.333%;
    }
  }