/**
 * Old school terminal style
 *
 * @see https://codepen.io/cvan/pen/Zarmry
 * @see http://aleclownes.com/2017/02/01/crt-display.html
 */

 /* define the main color theme */
:root {
  --background: rgb(1, 24, 1);
  --text: rgb(51, 251, 51);
  --input: yellow;
  --font: 600 1rem/1.3 Consolas, Andale Mono, monospace;
}

/* reset some styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
}

header {
  margin-bottom: 2rem;
}

body {
  background-color: var(--background);
  color: var(--text);
  font: var(--font);
  padding: 3rem;
}

/* format input fields */
/* TODO: a simple blinking cursor would even better than this! */
input {
  display: inline-block;
  position: relative;
  caret-color: var(--input);
  background: none;
  border: none;
  outline: none;
  border-bottom: 1px solid var(--input);
  border-style: none none dashed none;
  color: var(--input);
  font: 900 1rem/1.3 Consolas, Andale Mono, monospace;
  animation: textShadow 1.6s infinite;
  text-transform: uppercase;
}

/* format the link list */
ul {
  margin: 0;
  list-style: none;
}
li {
  margin: 0;
}
/* format the sub-lists */
ul > li > ul {
  margin-left: 1.75rem;
}
ul > li > ul > li::before {
  content: "├── ";
}
ul > li > ul > li:last-child::before {
  content: "└── ";
}

/* overwrite the default (blue) link styles */
a, a:visited {
  color: var(--text);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* add all the face flicker effects (only on desktop) */
@media screen and (min-width: 640px) {
  @keyframes flicker {
    0% {
      opacity: 0.27861;
    }
    5% {
      opacity: 0.34769;
    }
    10% {
      opacity: 0.23604;
    }
    15% {
      opacity: 0.90626;
    }
    20% {
      opacity: 0.18128;
    }
    25% {
      opacity: 0.83891;
    }
    30% {
      opacity: 0.65583;
    }
    35% {
      opacity: 0.67807;
    }
    40% {
      opacity: 0.26559;
    }
    45% {
      opacity: 0.84693;
    }
    50% {
      opacity: 0.96019;
    }
    55% {
      opacity: 0.08594;
    }
    60% {
      opacity: 0.20313;
    }
    65% {
      opacity: 0.71988;
    }
    70% {
      opacity: 0.53455;
    }
    75% {
      opacity: 0.37288;
    }
    80% {
      opacity: 0.71428;
    }
    85% {
      opacity: 0.70419;
    }
    90% {
      opacity: 0.7003;
    }
    95% {
      opacity: 0.36108;
    }
    100% {
      opacity: 0.24387;
    }
  }
  @keyframes textShadow {
    0% {
      text-shadow: 0.4389924193300864px 0 1px rgba(0,30,255,0.5), -0.4389924193300864px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    5% {
      text-shadow: 2.7928974010788217px 0 1px rgba(0,30,255,0.5), -2.7928974010788217px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    10% {
      text-shadow: 0.02956275843481219px 0 1px rgba(0,30,255,0.5), -0.02956275843481219px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    15% {
      text-shadow: 0.40218538552878136px 0 1px rgba(0,30,255,0.5), -0.40218538552878136px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    20% {
      text-shadow: 3.4794037899852017px 0 1px rgba(0,30,255,0.5), -3.4794037899852017px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    25% {
      text-shadow: 1.6125630401149584px 0 1px rgba(0,30,255,0.5), -1.6125630401149584px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    30% {
      text-shadow: 0.7015590085143956px 0 1px rgba(0,30,255,0.5), -0.7015590085143956px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    35% {
      text-shadow: 3.896914047650351px 0 1px rgba(0,30,255,0.5), -3.896914047650351px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    40% {
      text-shadow: 3.870905614848819px 0 1px rgba(0,30,255,0.5), -3.870905614848819px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    45% {
      text-shadow: 2.231056963361899px 0 1px rgba(0,30,255,0.5), -2.231056963361899px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    50% {
      text-shadow: 0.08084290417898504px 0 1px rgba(0,30,255,0.5), -0.08084290417898504px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    55% {
      text-shadow: 2.3758461067427543px 0 1px rgba(0,30,255,0.5), -2.3758461067427543px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    60% {
      text-shadow: 2.202193051050636px 0 1px rgba(0,30,255,0.5), -2.202193051050636px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    65% {
      text-shadow: 2.8638780614874975px 0 1px rgba(0,30,255,0.5), -2.8638780614874975px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    70% {
      text-shadow: 0.48874025155497314px 0 1px rgba(0,30,255,0.5), -0.48874025155497314px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    75% {
      text-shadow: 1.8948491305757957px 0 1px rgba(0,30,255,0.5), -1.8948491305757957px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    80% {
      text-shadow: 0.0833037308038857px 0 1px rgba(0,30,255,0.5), -0.0833037308038857px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    85% {
      text-shadow: 0.09769827255241735px 0 1px rgba(0,30,255,0.5), -0.09769827255241735px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    90% {
      text-shadow: 3.443339761481782px 0 1px rgba(0,30,255,0.5), -3.443339761481782px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    95% {
      text-shadow: 2.1841838852799786px 0 1px rgba(0,30,255,0.5), -2.1841838852799786px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
    100% {
      text-shadow: 2.6208764473832513px 0 1px rgba(0,30,255,0.5), -2.6208764473832513px 0 1px rgba(255,0,80,0.3), 0 0 3px;
    }
  }
  #output {
    animation: textShadow 1.6s infinite;
  }
  #output::before {
    content: " ";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    z-index: 2;
    background-size: 100% 2px, 3px 100%;
    pointer-events: none;
  }
  #output::after {
    content: " ";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: rgba(18, 16, 16, 0.1);
    opacity: 0;
    z-index: 2;
    pointer-events: none;
    animation: flicker 0.15s infinite;
  }
}