:root {
  --font-size: 12px;
  --color-background: #000;
  --color-text-primary: #8aef9d;
  --color-text-muted: #6fa47e;
  --color-border: #2a7742;
  --color-terminal-green: #36ff76;
  color-scheme: dark;
  font-family: monospace;
  font-size: 14px;
  color: var(--color-text-primary);
  background-color: var(--color-background);
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/IBMPlexMono-Regular.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/IBMPlexMono-Bold.ttf") format("truetype");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

body {
  margin: 0;
}

main {
  box-sizing: border-box;
  width: min(1100px, calc(100% - 32px));
  margin: 32px auto;
  padding: 32px 16px 16px;
  border: 1px solid var(--color-border);
  font-family: "IBM Plex Mono", monospace;
  font-size: var(--font-size);
  line-height: 1.5;
}

main > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

main > header h1 {
  margin: 0;
  color: var(--color-terminal-green);
  font-size: 1.5em;
  font-weight: 700;
}

.source a {
  color: inherit;
  text-decoration: underline;
}

.source a:hover {
  color: var(--color-terminal-green);
}

main > p {
  margin: 12px 0;
}

#save-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

main > header > a,
#save-controls button {
  padding: 4px 8px;
  border: 1px solid var(--color-border);
  border-radius: 0;
  background: #071a0d;
  box-shadow: 2px 2px #0a3418;
  color: var(--color-text-primary);
  text-align: center;
  text-decoration: none;
  font: inherit;
  cursor: pointer;
}

main > header > a:hover,
#save-controls button:is(:hover, :focus-visible):not(:disabled) {
  border-color: var(--color-terminal-green);
  background: var(--color-terminal-green);
  color: var(--color-background);
}

main > header > a:focus-visible,
.source a:focus-visible,
#save-controls button:focus-visible {
  outline: 2px solid var(--color-terminal-green);
  outline-offset: 3px;
}

#save-controls button:disabled {
  opacity: 0.5;
  cursor: default;
}

#dos {
  width: 100%;
  height: min(75vh, 800px);
  min-height: 320px;
  border: 1px solid var(--color-border);
  font: 14px/1.5 monospace;
}

.jsdos-rso .emulator-loader {
  background: none;
  border: 2px solid var(--color-border);
}

.source {
  color: var(--color-text-muted);
}

@media (max-width: 450px) {
  main {
    width: calc(100% - 16px);
    margin: 16px auto;
    padding: 16px 8px 8px;
  }
}