:root {
  --paper: #f4f7f8;
  --panel: #ffffff;
  --frost: #e2e9ed;
  --line: #c9d4da;
  --ink: #1d2a33;
  --muted: #5b6b76;
  --pine: #2e6a5c;
  --pine-ink: #ffffff;
  --rust: #b5452f;
  --rust-soft: #f6e3de;
  --focus: #2e6a5c;
  --ui: "Atkinson Hyperlegible", system-ui, sans-serif;
  --code: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131b21;
    --panel: #18222a;
    --frost: #1f2b34;
    --line: #2f3e48;
    --ink: #dbe4e9;
    --muted: #93a4ae;
    --pine: #5fae99;
    --pine-ink: #0f1a17;
    --rust: #e3826c;
    --rust-soft: #3a2420;
    --focus: #5fae99;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 var(--ui);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* The bar */

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
}

.title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.title-sub {
  font-weight: 400;
  color: var(--muted);
}

.example select,
.file-select {
  font: inherit;
  font-size: 0.9375rem;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 8px;
}

.actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.button {
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 700;
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
}

.button.quiet {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
}

.button.quiet:hover {
  background: var(--frost);
}

.button.primary {
  color: var(--pine-ink);
  background: var(--pine);
  border: 1px solid var(--pine);
  min-width: 5.5rem;
}

.button:disabled {
  opacity: 0.6;
  cursor: progress;
}

/* The two panes */

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: 0;
}

.pane {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 0;
  min-width: 0;
}

.source {
  grid-template-rows: auto 1fr auto;
  border-right: 1px solid var(--line);
}

/* The standard input of the program, folded away until needed */

.input {
  background: var(--frost);
  border-top: 1px solid var(--line);
}

.input summary {
  padding: 8px 12px;
  font-size: 0.875rem;
  cursor: pointer;
}

.input .hint {
  margin-left: 6px;
  color: var(--muted);
}

.input code {
  font-family: var(--code);
  font-size: 0.8125rem;
}

.input textarea {
  display: block;
  width: 100%;
  height: 7.5em;
  padding: 8px 12px;
  border: 0;
  border-top: 1px solid var(--line);
  resize: vertical;
  font: 14px/1.6 var(--code);
  color: var(--ink);
  background: var(--panel);
}

.pane-head {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 44px;
  padding: 0 12px;
  background: var(--frost);
  border-bottom: 1px solid var(--line);
}

.file {
  font-family: var(--code);
  font-size: 0.8125rem;
  color: var(--muted);
}

.editor {
  display: grid;
  grid-template-columns: auto 1fr;
  min-height: 0;
  background: var(--panel);
}

.gutter,
#code,
.view {
  margin: 0;
  font: 14px/1.6 var(--code);
  tab-size: 4;
}

.gutter {
  padding: 12px 8px 12px 12px;
  color: var(--muted);
  text-align: right;
  user-select: none;
  overflow: hidden;
  border-right: 1px solid var(--frost);
}

.gutter .bad {
  color: var(--rust);
  font-weight: 600;
}

#code {
  width: 100%;
  height: 100%;
  padding: 12px;
  border: 0;
  resize: none;
  color: var(--ink);
  background: transparent;
  white-space: pre;
  overflow: auto;
}

#code:focus-visible {
  outline: none;
}

/* The tabs: one program, three languages */

.tab {
  font: inherit;
  font-size: 0.9375rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  padding: 10px 10px 7px;
  cursor: pointer;
}

.tab[aria-selected="true"] {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--pine);
}

.tab-sep {
  width: 1px;
  height: 20px;
  margin: 0 6px;
  background: var(--line);
}

.file-select {
  margin-left: auto;
  font-family: var(--code);
  font-size: 0.8125rem;
}

.view {
  padding: 12px 16px;
  overflow: auto;
  white-space: pre;
  background: var(--panel);
}

.view .stderr {
  color: var(--rust);
}

.view .note {
  color: var(--muted);
  font-family: var(--ui);
  white-space: normal;
}

.view .code-link {
  font: inherit;
  color: var(--rust);
  background: none;
  border: 0;
  padding: 0;
  text-decoration: underline;
  cursor: pointer;
}

/* The status line */

.status {
  padding: 6px 20px;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.status.bad {
  color: var(--rust);
  background: var(--rust-soft);
}

@media (max-width: 760px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(260px, 1fr) minmax(260px, 1fr);
  }

  .source {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .bar {
    padding: 10px 16px;
  }

  .actions {
    margin-left: 0;
    width: 100%;
  }

  .actions .primary {
    margin-left: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}