html {
  --color-body: #000080;
  --color-bg0: #8d8d8d;
  --color-bg1: #ccc;
  --color-bg2: #fff;
  --color-fg-primary: #000;
  --color-border: #333;
  --color-highlight: #ffff00;
  --color-bar: #000088;
  --color-danger-muted: #800000;
  --shadow-distance: 15px;
}

.hidden, [hidden] {
  display: none !important;
}

@font-face {
  font-family: "04B_30";
  src:
    local("04B_30"),
    url("fonts/04B.ttf") format("truetype");
}

@font-face {
  font-family: "FixedsysExcelsior";
  src:
    local("Fixedsys Excelsior"),
    url("fonts/FSEX302.ttf") format("truetype");
}

body {
  color: var(--color-fg-primary);
  background: var(--color-body);
  font: 12pt FixedsysExcelsior, monospace;
  font-display: swap;
  font-smooth: never;
  -webkit-font-smoothing: none;
}

.container {
  max-width: 800px;
  width: 100%;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-sizing: border-box;
  padding: 18pt 8pt;
  background: var(--color-bg0);
  box-shadow: var(--shadow-distance) var(--shadow-distance) 0 #000;
}

.container kbd {
  color: var(--color-highlight);
  font: inherit;
  font-display: swap;
  font-smooth: never;
  -webkit-font-smoothing: none;
}

.btn {
  font: 12pt FixedsysExcelsior, monospace;
  font-display: swap;
  font-smooth: never;
  -webkit-font-smoothing: none;
  background: var(--color-bg1);
  color: var(--color-fg-primary);
  border-radius: 0;
  border: 2px solid var(--color-border);
  padding: 2pt 4pt;
  cursor: pointer;
}

.btn:active {
  border-color: var(--color-bg2);
}

@keyframes slide {
  0% {
    left: 0; /* Start off-screen left */
  }
  50% {
    left: 75%; /* Move to off-screen right */
  }
  100% {
    left: 0; /* Return to off-screen left */
  }
}

.spinner {
  display: block;
  position: relative;
  overflow: hidden;
  background: var(--color-bg1);
  color: var(--color-fg-primary);
  border-radius: 0;
  border: 2px solid var(--color-border);
  padding: 2px;
  height: 32px;
  box-sizing: border-box;
}

.spinner:before {
  content: '';
  display: block;
  position: absolute;
  height: 24px;
  width: 25%;
  background: var(--color-bar);
  left: 0;
  animation: slide 3s steps(20) infinite;
}

.input {
  font: 12pt FixedsysExcelsior, monospace;
  font-display: swap;
  font-smooth: never;
  -webkit-font-smoothing: none;
  background: var(--color-bg1);
  color: var(--color-fg-primary);
  border-radius: 0;
  border: 2px solid var(--color-border);
  padding: 2pt 4pt;
}

.input:focus {
  background: var(--color-bg2);
  outline: 0;
}

.header {
  text-align: center;
  font-family: '04B_30';
  padding: 32px;
}

.header .title {
   font-size: 32pt;
}

.title .power {
  color: green;
}

.title .key {
  color: #800000;
}

.content {
  text-align: center;
  margin-top: 10pt;
}

.content .descr {
  margin: 18pt 0;
}

.icon-error {
  display: inline-block;
  margin: 0 auto;
  position: relative;
  padding: 4px;
  font-size: 48pt;
  color: #fff;
}

.icon-error:before {
  content: '';
  position: absolute;
  z-index: -1;
  display: block;
  height: 48pt;
  width: 48pt;
  background: var(--color-danger-muted);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
}