/* Catppuccin Mocha — same palette as the desktop IDE (gui.py:9-12) */
:root {
  --bg:#1e1e2e; --bg2:#313244; --bg3:#181825;
  --fg:#cdd6f4; --fg2:#6c7086;
  --purple:#cba6f7; --blue:#89b4fa; --cyan:#89dceb;
  --green:#a6e3a1; --red:#f38ba8; --yellow:#f9e2af; --peach:#fab387;

  --mono: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
  --sans: system-ui, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

/* Three rows: header / panes / status bar. */
body {
  margin: 0;
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
}

/* ---------- header ---------- */

header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1rem;
  background: var(--bg3);
  border-bottom: 1px solid var(--bg2);
}

header h1 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--purple);
}

#examples, #run {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--bg2);
}

#examples {
  background: var(--bg2);
  color: var(--fg);
  min-width: 14rem;
}

#run {
  margin-left: auto;          /* pushes Run to the far right */
  background: var(--green);
  color: var(--bg3);
  font-weight: 700;
  border-color: transparent;
  cursor: pointer;
}

#run:disabled {
  background: var(--bg2);
  color: var(--fg2);
  cursor: not-allowed;
}

/* ---------- panes ---------- */

/* min-height:0 lets grid/flex children shrink so the panes scroll
   internally instead of stretching the page. */
main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1rem;
  min-height: 0;
}

section {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

section h2 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

section:first-child  h2 { color: var(--blue); }
section:last-child   h2 { color: var(--cyan); }

/* Shared text metrics. The highlight overlay and the textarea MUST agree on
   every one of these or the colored text drifts out of line with the caret. */
#editor, #highlight, #output {
  margin: 0;
  padding: 0.75rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.5;
  tab-size: 4;
  /* Cascadia Code renders "<=" as a single "≤" glyph. On a page that teaches
     Aurora's syntax that shows characters you cannot type, so: off. */
  font-variant-ligatures: none;
}

/* --- editor: a highlighted <pre> sitting behind a transparent <textarea> --- */

.editor-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
}

#editor, #highlight {
  position: absolute;
  inset: 0;
  border: 1px solid var(--bg2);
  border-radius: 8px;
  overflow: auto;
  /* No soft wrap. Wrapping would reflow differently in the two layers as soon
     as the textarea's scrollbar narrows it, and the text would misalign. */
  white-space: pre;
}

#highlight {
  background: var(--bg3);
  color: var(--fg);
  pointer-events: none;       /* clicks belong to the textarea on top */
  scrollbar-width: none;      /* only the textarea shows scrollbars */
}
#highlight::-webkit-scrollbar { display: none; }

#editor {
  background: transparent;
  color: transparent;         /* the glyphs you see come from the overlay */
  caret-color: var(--fg);     /* ...but the caret must stay visible */
  resize: none;
  outline: none;
}

#editor:focus { border-color: var(--purple); }

/* Token colors — same mapping as gui.py:110-114 */
.tok-kw  { color: var(--purple); }
.tok-str { color: var(--green); }
.tok-num { color: var(--peach); }
.tok-cmt { color: var(--fg2); font-style: italic; }

/* --- output --- */

#output {
  flex: 1;
  min-height: 0;
  overflow: auto;
  background: var(--bg3);
  color: var(--green);        /* gui.py:98 */
  border: 1px solid var(--bg2);
  border-radius: 8px;
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

.error { color: var(--red); }   /* gui.py:102 */
.info  { color: var(--blue); }  /* gui.py:103 */

/* ---------- status bar ---------- */

footer {
  padding: 0.45rem 1rem;
  background: var(--bg3);
  border-top: 1px solid var(--bg2);
  color: var(--fg2);
  font-size: 0.8rem;
}

/* ---------- narrow screens ---------- */

@media (max-width: 800px) {
  main { grid-template-columns: 1fr; }
  header { flex-wrap: wrap; }
  #examples { min-width: 0; flex: 1; }
}