:root {
  color-scheme: light dark;

  --fg: light-dark(#000, #fff);
  --bg-alt: light-dark(#dfdfdf, #333);
  --progress-width: 0%;
}

body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1rem auto;
  max-width: 900px;
  padding: 0 1rem;
  font-size: 1rem;
  font-family: sans-serif;
  color: var(--fg);
}

h1 {
  font-size: 2.5rem;
  margin: 0;
}

form {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

::file-selector-button,
button {
  cursor: pointer;
  border: 1px solid var(--fg);
  border-radius: 8px;
  background: var(--bg-alt);
  padding: 0.4rem;
}

@keyframes loading {
  to {
    background-position: -20% 0;
  }
}

[role="progressbar"] {
  border-radius: 999px;
  height: 10px;
  border: 1px solid var(--fg);
  position: relative;
  background: linear-gradient(
    to right,
    var(--bg-alt) 42%,
    light-dark(#bbb, #888) 50%,
    var(--bg-alt) 58%
  );
  background-size: 200%;
  background-position: 120% 0;
  animation: loading 1.4s ease-in-out infinite;
}
[role="progressbar"]::after {
  content: "";
  position: absolute;
  inset: 0;
  width: var(--progress-width);
  background: light-dark(#65aaf4, #65aaf4);
  transition: width 0.3s;
}
[role="progressbar"]:not([aria-valuemax]) {
  display: none;
}

output {
  display: block;
  height: 200px;
  overflow-y: scroll;
  white-space: pre-wrap;
  font-family: monospace;
  font-size: 0.8rem;
  padding: 0.4rem;
  background: var(--bg-alt);
  border: 1px solid var(--fg);
  border-radius: 8px;
}
output:empty {
  display: none;
}

time {
  font-weight: 700;
}

ul {
  padding-left: 1rem;
}