/* =============================================================
   playground.css — interactive (editable) code-block component.
   Companion to causl-org/js/playground.js. Mirrors the visual
   language of .codeblock (same surface + text pair tokens
   from #1268; #1294 dropped the wrapper div) so the read-only
   and editable blocks read
   as members of the same family, but adds an "editable" cue
   (caret, focus border, EDITABLE badge) so users know the box
   talks back.
   ============================================================= */

.playground-wrapper {
  position: relative;
  margin: 1rem 0;
  border-radius: 8px;
  background: var(--surface-elevated);
  color: var(--text-on-elevated);
  border: 1px solid rgba(143, 162, 170, 0.18);
  /* Subtle "I am interactive" cue: a slightly stronger left edge in
     the brand cyan, echoing the slide-out terminal accent. */
  border-left: 3px solid var(--causl-async-cyan);
  overflow: hidden;
}

.playground-wrapper::before {
  /* Top-right corner badge so users see at a glance this is editable.
     Lives in CSS so the markup stays semantic. */
  content: 'EDITABLE';
  position: absolute;
  top: 0.45rem;
  right: 0.5rem;
  z-index: 1;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--causl-async-cyan);
  background: rgba(11, 17, 24, 0.55);
  border: 1px solid rgba(143, 162, 170, 0.22);
  pointer-events: none;
  text-transform: uppercase;
}

.playground-editor-row {
  display: flex;
  align-items: stretch;
  gap: 0.9rem;
  padding: 0.6rem 0.6rem 0.4rem;
}

.playground-gutter {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding: 0.55rem 0.4rem 0.4rem 0.1rem;
  border-right: 1px solid rgba(143, 162, 170, 0.18);
  color: var(--text-on-elevated-subtle);
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.6;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  pointer-events: none;
  flex: 0 0 auto;
  /* Match the textarea's intrinsic line-height & padding so numbers
     line up with their corresponding source lines. */
}

.playground-gutter-line {
  display: block;
  text-align: right;
  min-width: 1.4em;
  line-height: inherit;
}

.playground-source {
  flex: 1 1 auto;
  min-width: 0;
  display: block;
  width: 100%;
  margin: 0;
  padding: 0.55rem 0.4rem;
  background: transparent;
  color: var(--text-on-elevated);
  border: 0;
  outline: 0;
  resize: vertical;
  /* Match the codeblock font so editable + read-only share
     metrics. */
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.6;
  white-space: pre;
  overflow-wrap: normal;
  /* Caret cue: a slightly brighter caret signals "you can type here"
     without changing the layout. */
  caret-color: var(--causl-async-cyan);
  tab-size: 2;
  -moz-tab-size: 2;
  /* Sensible default height; users can drag the resizer downward. */
  min-height: 6.5rem;
}

.playground-source:focus,
.playground-source:focus-visible {
  outline: none;
  /* Ring is on the wrapper so it doesn't clip the editor's resize
     grip. */
}

.playground-wrapper:focus-within {
  box-shadow: 0 0 0 2px var(--causl-async-cyan);
}

/* ---------- Toolbar ---------- */

.playground-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.6rem 0.6rem;
}

.playground-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  border: 1px solid rgba(215, 230, 234, 0.22);
  background: rgba(11, 17, 24, 0.45);
  color: var(--text-on-elevated-muted);
  font: inherit;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease, border-color 120ms ease;
}

.playground-btn svg {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}

.playground-btn:hover,
.playground-btn:focus-visible {
  background: var(--surface-overlay);
  color: var(--text-on-overlay, var(--text-on-elevated));
  border-color: rgba(215, 230, 234, 0.35);
  outline: none;
}

.playground-btn:focus-visible {
  box-shadow: 0 0 0 2px var(--causl-async-cyan);
}

.playground-run {
  /* The primary action gets a brand accent so it pops out of the
     toolbar without needing a colour swap on click. */
  border-color: var(--causl-async-cyan);
  color: var(--causl-async-cyan);
}

.playground-run:hover,
.playground-run:focus-visible {
  background: rgba(78, 168, 222, 0.12);
  color: var(--causl-async-cyan);
  border-color: var(--causl-async-cyan);
}

/* ---------- Slide-out terminal ---------- */

.playground-terminal {
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  background: var(--surface-overlay);
  color: var(--text-on-overlay, var(--text-on-elevated));
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  border-radius: 0 0 5px 5px;
  border-top: 1px solid rgba(143, 162, 170, 0.18);
  transition: max-height 250ms ease, padding 250ms ease;
  white-space: pre-wrap;
  word-break: break-word;
}

.playground-terminal.is-open {
  max-height: 240px;
  overflow: auto;
  padding: 0.6rem 1rem;
}

@media (prefers-reduced-motion: reduce) {
  .playground-terminal {
    transition: none;
  }
}