:root {
  --page: #f6f8fa;
  --surface: #ffffff;
  --surface-muted: #f0f3f6;
  --border: #d0d7de;
  --border-strong: #8c959f;
  --ink: #24292f;
  --muted: #57606a;
  --red: #cf222e;
  --red-dark: #a40e26;
  --green: #1a7f37;
  --terminal: #0d1117;
  --terminal-border: #30363d;
  --terminal-text: #e6edf3;
  --terminal-muted: #8b949e;
  --radius: 6px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px),
    var(--page);
  background-size: 32px 32px;
}

code,
textarea,
pre,
select,
button {
  font-family: var(--mono);
}

.app-shell {
  width: min(1780px, calc(100vw - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 16px 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 10px 0 14px;
}

.repo-kicker {
  margin: 0 0 2px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
}

h1 {
  margin: 0;
  font-size: 1.85rem;
  font-weight: 650;
  letter-spacing: 0;
}

.workbench {
  display: grid;
  grid-template-columns: minmax(720px, 2.7fr) minmax(340px, 0.85fr);
  gap: 14px;
  min-height: calc(100vh - 96px);
}

.program-pane,
.side-pane > section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.program-pane {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-width: 0;
}

.toolbar,
.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-muted);
}

.toolbar-title,
.pane-header {
  font-family: var(--mono);
  font-size: 0.86rem;
  font-weight: 650;
}

.prompt {
  color: var(--green);
  margin-right: 5px;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: end;
  gap: 8px;
}

.select-wrap,
.field,
.editor-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.select-wrap span,
.field span,
.editor-wrap span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 650;
}

select,
textarea,
.button {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.86rem;
}

select,
textarea {
  background: var(--surface);
  color: var(--ink);
}

select {
  min-width: 164px;
  min-height: 34px;
  padding: 6px 28px 6px 8px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  cursor: pointer;
  padding: 6px 11px;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--mono);
  text-decoration: none;
  white-space: nowrap;
}

.button:hover {
  background: var(--surface-muted);
}

.button-primary {
  border-color: var(--red-dark);
  background: var(--red);
  color: #ffffff;
  font-weight: 700;
}

.button-primary:hover {
  background: var(--red-dark);
}

.button-docs {
  border-color: #0969da;
  background: #ddf4ff;
  color: #0969da;
  font-weight: 700;
}

.button-docs:hover {
  background: #b6e3ff;
}

.editor-wrap {
  min-height: 0;
  padding: 10px;
}

#source-code {
  flex: 1;
  width: 100%;
  min-height: 72vh;
  resize: none;
  padding: 16px 18px;
  border-color: var(--border-strong);
  line-height: 1.55;
  font-size: 1rem;
  tab-size: 4;
}

#source-code:focus,
#stdin-queue:focus,
select:focus,
.button:focus-visible {
  outline: 2px solid #0969da;
  outline-offset: 1px;
}

.side-pane {
  display: grid;
  grid-template-rows: minmax(260px, 1.1fr) auto minmax(260px, 0.9fr);
  gap: 14px;
  min-width: 0;
}

.terminal-pane {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
  background: var(--terminal) !important;
  border-color: var(--terminal-border) !important;
}

.terminal-pane .pane-header {
  background: #161b22;
  border-color: var(--terminal-border);
  color: var(--terminal-text);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border: 1px solid var(--terminal-border);
  border-radius: 999px;
  color: var(--terminal-muted);
  font-size: 0.72rem;
  font-weight: 650;
}

.status-pill.success {
  border-color: rgba(46, 160, 67, 0.6);
  color: #7ee787;
}

.status-pill.error {
  border-color: rgba(248, 81, 73, 0.7);
  color: #ff7b72;
}

#program-output {
  min-height: 0;
  margin: 0;
  overflow: auto;
  padding: 14px;
  color: var(--terminal-text);
  background: var(--terminal);
  font-size: 0.92rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.input-pane {
  padding: 10px;
}

#stdin-queue {
  width: 100%;
  min-height: 118px;
  resize: vertical;
  padding: 10px;
  line-height: 1.45;
}

.reference-pane {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
}

.reference-grid {
  overflow: auto;
  padding: 8px 10px 10px;
}

.reference-grid div {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.reference-grid span {
  color: var(--muted);
  font-size: 0.84rem;
}

.reference-grid code {
  overflow-wrap: anywhere;
  font-size: 0.82rem;
}

@media (max-width: 1160px) {
  .workbench {
    grid-template-columns: 1fr;
  }

  .side-pane {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
    grid-template-rows: auto auto;
  }

  .terminal-pane {
    min-height: 280px;
  }

  .reference-pane {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .app-shell {
    width: min(100vw - 20px, 1780px);
    padding-top: 10px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar-actions,
  .toolbar-actions > *,
  select,
  .button {
    width: 100%;
  }

  .side-pane {
    grid-template-columns: 1fr;
  }

  #source-code {
    min-height: 62vh;
    font-size: 0.92rem;
  }
}