:root {
  height: 100%;
  
  --base-color: #fff;
  --primary-color: hsl(214, 100%, 48%);
  --primary-color-10pct: hsla(214, 100%, 60%, 0.13);
  --primary-contrast-color: #fff;
  --error-text-color: hsl(3, 89%, 42%);
  --error-color-10pct: hsla(3, 85%, 49%, 0.1);
  --contrast-10pct: hsla(214, 57%, 24%, 0.1);
  --header-text-color: hsl(214, 35%, 15%);
}

html,
body {
  height: 100%;
  margin: 0;

  display: flex;
  flex-direction: column;
  background: var(--base-color);

  font-family: -apple-system, BlinkMacSystemFont, San Francisco, Segoe UI, Roboto, Helvetica Neue, sans-serif;
}

#menu {
  display: flex;
  flex-direction: row;
  gap: 5px;
  padding: 5px;
  border-bottom: solid 1px var(--contrast-10pct);

  overflow-y: auto;
}

#menu > a {
  display: inline-block;

  color: var(--primary-color);
  background-color: var(--primary-color-10pct);
  border-radius: 4px;

  padding: 0.5625rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;

  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
}

#menu > a:hover {
  text-decoration: none;
  opacity: 0.8;
}

#menu > a.active {
  color: var(--primary-contrast-color);
  background-color: var(--primary-color);
}

#content {
  display: flex;
  flex-grow: 1;
  align-items: center;
  justify-content: center;
}

#loader {
  position: absolute;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--base-color);
  opacity: 1;
  transition: 0.2s opacity ease-in;
  line-height: 1.625;
  z-index: 1000;
}

#loader.loading #start {
    display: none;
}

#loader:not(.loading) .progressbar {
    display: none;
}

#loader header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
  color: var(--header-text-color);
  font-size: 1.75rem;
  user-select: none;
}

#loader header > span.title {
  font-weight: 600;
  margin-right: 1rem;
  line-height: 1;
}

#loader header > span.domain {
  font-size: 0.8rem;
  font-weight: 400;
  align-self: flex-end;
}

#loader .info,
#loader .progressbar {
  width: 80%;
  max-width: 20rem;
}

#loader .info {
  color: var(--primary-color);
  background-color: var(--primary-color-10pct);
  padding: 0.6em 0.8em;
  border-radius: 0.25em;
  line-height: 1.2;
  text-align: center;
}

#loader noscript.info {
  color: var(--error-text-color);
  background-color: var(--error-color-10pct);
}


#loader .progressbar {
  height: 0.275rem;
  margin: 0.5rem 0;
}

#loader .bar {
  height: 100%;
  border-radius: 0.25em;
  background-color: var(--contrast-10pct);
}

#loader .value {
  --progress-bar-background: linear-gradient(
    to right,
    var(--primary-color-10pct) 10%,
    var(--primary-color)
  );
  --progress-bar-background-reverse: linear-gradient(
    to left,
    var(--primary-color-10pct) 10%,
    var(--primary-color)
  );

  width: 100%;
  height: 100%;
  opacity: 0.75;
  border-radius: 0.25em;
  background-color: transparent !important;
  background-image: var(--progress-bar-background);
  transform-origin: 0 50%;
  will-change: transform;
  animation: loader-progress-indeterminate 1.6s infinite cubic-bezier(0.645, 0.045, 0.355, 1);
  transition: 0.1s width linear;
}

#loader .value::before {
  content: '';
  width: 100%;
  height: 100%;
  display: block;
  border-radius: inherit;
  background-color: var(--primary-color);
  will-change: opacity;
  animation: loader-progress-pulse 1.6s infinite cubic-bezier(0.645, 0.045, 0.355, 1);
}

@keyframes loader-progress-indeterminate {
  0% {
    transform: scaleX(0.015);
    transform-origin: 0% 0%;
  }

  25% {
    transform: scaleX(0.4);
  }

  50% {
    transform: scaleX(0.015);
    transform-origin: 100% 0%;
    background-image: var(--progress-bar-background);
  }

  50.1% {
    transform: scaleX(0.015);
    transform-origin: 100% 0%;
    background-image: var(--progress-bar-background-reverse);
  }

  75% {
    transform: scaleX(0.4);
  }

  100% {
    transform: scaleX(0.015);
    transform-origin: 0% 0%;
    background-image: var(--progress-bar-background-reverse);
  }
}

@keyframes loader-progress-pulse {
  0% {
    opacity: 1;
  }

  10% {
    opacity: 0;
  }

  40% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }

  50.1% {
    opacity: 1;
  }

  60% {
    opacity: 0;
  }

  90% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

#viewer.loading {
  display: none;
}

#viewer {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  background: #fff;
  outline: 0;
}