/* Aura playground.
   Themes are two sets of custom properties. The default follows the operating
   system; the toggle writes data-theme on <html>, which wins over the media
   query, and the choice is remembered. */

:root {
  --bg: #fbfbfa;
  --panel: #ffffff;
  --border: #e3e1dd;
  --text: #24211d;
  --muted: #6b665e;
  --accent: #b4530a;
  --accent-soft: #fdf0e4;
  --error: #b3261e;
  --error-soft: #fdeceb;
  --warn: #8a6100;
  --warn-soft: #fdf5e2;

  --kw: #9026a8;
  --str: #1c6b3c;
  --num: #1a5fb4;
  --cmt: #8b867d;
  --lit: #1a5fb4;
  --op: #6b665e;
  --id: #24211d;

  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo,
    Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    sans-serif;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #171614;
    --panel: #1e1d1a;
    --border: #33312d;
    --text: #e8e5e0;
    --muted: #9a948a;
    --accent: #f0913f;
    --accent-soft: #2c2118;
    --error: #ff8a80;
    --error-soft: #2f1d1c;
    --warn: #e8c168;
    --warn-soft: #2c2519;

    --kw: #e08ff5;
    --str: #7ed99f;
    --num: #86b8ff;
    --cmt: #7d786f;
    --lit: #86b8ff;
    --op: #9a948a;
    --id: #e8e5e0;
  }
}

:root[data-theme="dark"] {
  --bg: #171614;
  --panel: #1e1d1a;
  --border: #33312d;
  --text: #e8e5e0;
  --muted: #9a948a;
  --accent: #f0913f;
  --accent-soft: #2c2118;
  --error: #ff8a80;
  --error-soft: #2f1d1c;
  --warn: #e8c168;
  --warn-soft: #2c2519;

  --kw: #e08ff5;
  --str: #7ed99f;
  --num: #86b8ff;
  --cmt: #7d786f;
  --lit: #86b8ff;
  --op: #9a948a;
  --id: #e8e5e0;
}

* {
  box-sizing: border-box;
}

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

body {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

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

header {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.brand {
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-right: auto;
}

.brand span {
  color: var(--muted);
  font-weight: 400;
}

label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  white-space: nowrap;
}

select,
input[type="text"] {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
}

input[type="text"] {
  width: 22ch;
  font-family: var(--mono);
  font-size: 12px;
}

input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
}

button {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

:is(button, select, input, .tab):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* ---- layout ---- */

main {
  display: grid;
  /* The splitter writes --split; the middle track is the handle itself. */
  grid-template-columns: var(--split, 1fr) 5px 1fr;
  flex: 1;
  min-height: 0;
  background: var(--border);
}

.splitter {
  cursor: col-resize;
  background: var(--border);
  border: 0;
  touch-action: none;
}

.splitter:hover,
.splitter:focus-visible {
  background: var(--accent);
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--panel);
}

.tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: thin;
}

.tab {
  font: inherit;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
  white-space: nowrap;
}

.tab:hover {
  color: var(--text);
}

.tab[aria-selected="true"] {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--border);
}

.tab .close {
  margin-left: 6px;
  opacity: 0.5;
}

.tab .close:hover {
  opacity: 1;
}

/* ---- editor: a textarea over a highlighted copy ---- */

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

/* Line numbers live outside the text flow, so selecting the source and copying
   it never picks them up — the usual complaint about numbered code blocks. */
.gutter {
  position: absolute;
  top: 0;
  left: 0;
  width: 3.2em;
  padding: 12px 8px 12px 0;
  text-align: right;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--cmt);
  background: var(--panel);
  border-right: 1px solid var(--border);
  white-space: pre;
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none;
  z-index: 1;
}

.editor pre,
.editor textarea {
  margin: 0;
  padding: 12px 14px 12px calc(3.2em + 14px);
  border: 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  tab-size: 2;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

.editor pre {
  position: absolute;
  inset: 0;
  pointer-events: none;
  color: var(--id);
  min-height: 100%;
}

.editor textarea {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 100%;
  color: transparent;
  background: transparent;
  caret-color: var(--text);
  resize: none;
  outline: none;
}

.editor textarea::selection {
  background: color-mix(in srgb, var(--accent) 28%, transparent);
}

.kw {
  color: var(--kw);
}
.str {
  color: var(--str);
}
.num {
  color: var(--num);
}
.cmt {
  color: var(--cmt);
  font-style: italic;
}
.lit {
  color: var(--lit);
}
.op {
  color: var(--op);
}

/* ---- output ---- */

.output {
  flex: 1;
  min-height: 0;
  margin: 0;
  padding: 12px 14px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre;
  color: var(--text);
}

.output.stale {
  opacity: 0.45;
}

/* ---- diagnostics ---- */

.diagnostics {
  border-top: 1px solid var(--border);
  background: var(--panel);
  max-height: 30vh;
  overflow: auto;
}

.diagnostics:empty {
  display: none;
}

.diag {
  display: flex;
  gap: 10px;
  align-items: baseline;
  width: 100%;
  text-align: left;
  font: inherit;
  padding: 7px 16px;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: none;
  cursor: pointer;
}

.diag:hover {
  background: var(--accent-soft);
}

.diag.error {
  background: var(--error-soft);
}

.diag.warning {
  background: var(--warn-soft);
}

.diag .code {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

.diag.error .code {
  color: var(--error);
}

.diag.warning .code {
  color: var(--warn);
}

.diag .where {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  flex-shrink: 0;
}

.status {
  padding: 7px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  background: var(--panel);
}

.status.ok {
  color: var(--str);
}

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

@media (max-width: 860px) {
  body {
    overflow: auto;
  }

  /* Stacked: one column, and the horizontal handle has nothing to resize. */
  main {
    grid-template-columns: 1fr;
  }

  .splitter {
    display: none;
  }

  .pane {
    min-height: 45vh;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .tab,
  button,
  .diag {
    transition:
      background-color 0.12s ease,
      color 0.12s ease,
      border-color 0.12s ease;
  }
}