:root {
  --bg: #1e1e2e;
  --panel-bg: #282a3a;
  --fg: #e4e4e8;
  --accent: #7dd3fc;
  --border: #44475a;
  --terminal-green: #33ff33;
  --canvas-bg: #000;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

header h1 {
  font-size: 1.1rem;
  margin: 0;
}

header p {
  margin: 0;
  font-size: 0.85rem;
  opacity: 0.7;
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr auto auto;
  gap: 0.5rem;
  padding: 0.5rem;
  min-height: 0;
}

.editor-pane {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: var(--panel-bg);
}

.editor-pane textarea,
.editor-pane pre {
  margin: 0;
  padding: 0.75rem;
  font: inherit;
  font-size: 0.95rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
  position: absolute;
  inset: 0;
  overflow: auto;
}

.editor-pane pre {
  pointer-events: none;
  color: var(--fg);
}

.editor-pane textarea {
  background: transparent;
  color: transparent;
  caret-color: var(--fg);
  border: none;
  resize: none;
  outline: none;
  z-index: 1;
}

#canvas {
  width: 100%;
  height: 100%;
  background: var(--canvas-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  /* Classic phosphor-terminal green, matching the original childhood demo
     this project recreates — see tests/program.test.js's clock example. */
  color: var(--terminal-green);
}

.controls {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.controls button {
  font: inherit;
  padding: 0.4rem 1rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  color: var(--fg);
  cursor: pointer;
}

.controls button:disabled {
  opacity: 0.5;
  cursor: default;
}

.controls button#run {
  border-color: var(--accent);
}

#output {
  grid-column: 1 / -1;
  max-height: 8rem;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--panel-bg);
  padding: 0.5rem 0.75rem;
  white-space: pre-wrap;
  font-size: 0.85rem;
}

.tortue-keyword {
  color: #ff79c6;
}
.tortue-variable {
  color: #8be9fd;
}
.tortue-string {
  color: #f1fa8c;
}
.tortue-number {
  color: #bd93f9;
}
.tortue-bracket {
  color: #ffb86c;
}
.tortue-comment {
  color: #6272a4;
  font-style: italic;
}
.tortue-operator {
  color: var(--fg);
}