/* The playground pages: the editor (index.html) and the conformance suite
   (conformance.html). */
:root {
  color-scheme: light dark;
  --bg: #f6f8fa;
  --panel: #ffffff;
  --panel-2: #f0f3f6;
  --text: #17202a;
  --muted: #64748b;
  --border: #d8dee4;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --danger: #b91c1c;
  --ok: #047857;
  --warn: #b45309;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --selection: rgba(37, 99, 235, 0.22);
  --error-line: rgba(185, 28, 28, 0.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --panel: #111827;
    --panel-2: #1f2937;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #334155;
    --accent: #60a5fa;
    --accent-strong: #93c5fd;
    --danger: #fca5a5;
    --ok: #6ee7b7;
    --warn: #fbbf24;
    --shadow: 0 18px 42px rgba(0, 0, 0, 0.35);
    --syntax-comment: #9ca3af;
    --syntax-keyword: #c4b5fd;
    --syntax-variable: #7dd3fc;
    --syntax-string: #86efac;
    --syntax-number: #fda4af;
    --syntax-predicate: #fbbf24;
    --syntax-operator: #cbd5e1;
    --syntax-punctuation: #94a3b8;
    --selection: rgba(96, 165, 250, 0.30);
    --error-line: rgba(252, 165, 165, 0.14);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--sans);
}
header, main, footer { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
header { display: flex; gap: 16px; align-items: center; padding-top: 28px; padding-bottom: 8px; }
header img { flex: none; width: 64px; height: 64px; border-radius: 50%; }
header h1 { margin: 0 0 2px; font-size: 26px; letter-spacing: -0.01em; }
header p { margin: 0; color: var(--muted); }
header p.tagline { color: var(--text); font-weight: 600; margin-bottom: 4px; }
header a, footer a { color: var(--accent); }
main { display: grid; gap: 16px; padding-top: 12px; padding-bottom: 24px; }
section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 12px 14px;
}
.toolbar + .toolbar { border-top: 1px solid var(--border); }
.toolbar label { font-weight: 600; }
.toolbar label.option { font-weight: 400; display: inline-flex; gap: 6px; align-items: center; }
input[type="search"], input[type="text"], input[type="url"], input[type="number"], select {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  min-width: 0;
}
input[type="number"] { width: 9em; }
#example-search { width: 12em; }
#examples { flex: 1 1 22em; }
#goal { flex: 1 1 24em; font-family: var(--mono); }
#source-url { flex: 1 1 24em; }
button {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.primary:hover:not(:disabled) { background: var(--accent-strong); border-color: var(--accent-strong); }
details > summary { cursor: pointer; padding: 12px 14px; font-weight: 600; }
details[open] > summary { border-bottom: 1px solid var(--border); }
.hint { color: var(--muted); font-size: 13px; font-weight: 400; }
.panel-body { padding: 0 14px 12px; }
.editor-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.editor {
  position: relative;
  height: 460px;
  font: 14px/1.55 var(--mono);
  background: var(--panel);
}
.line-numbers {
  position: absolute;
  inset: 0 auto 0 0;
  width: 52px;
  overflow: hidden;
  background: var(--panel-2);
  border-right: 1px solid var(--border);
  color: var(--muted);
  text-align: right;
  user-select: none;
}
.line-numbers-inner { padding: 12px 8px 12px 0; }
.line-number { display: block; }
.line-number.error { color: var(--danger); font-weight: 700; }
.error-line-marker {
  position: absolute;
  left: 52px;
  right: 0;
  height: 1.55em;
  background: var(--error-line);
  pointer-events: none;
  display: none;
}
#highlight, #source {
  position: absolute;
  inset: 0 0 0 52px;
  margin: 0;
  padding: 12px 14px;
  border: 0;
  font: inherit;
  white-space: pre;
  overflow: auto;
  tab-size: 4;
}
#highlight { pointer-events: none; color: var(--text); }
#highlight code { font: inherit; }
#source {
  resize: none;
  color: transparent;
  background: transparent;
  caret-color: var(--text);
  outline: none;
}
#source::selection { background: var(--selection); }
.output {
  margin: 0;
  padding: 12px 14px;
  min-height: 140px;
  max-height: 520px;
  overflow: auto;
  font: 14px/1.55 var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
}
.output.error { color: var(--danger); }
.output .tok-comment { font-style: normal; }
.status {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  background: var(--panel-2);
  font-size: 13px;
  color: var(--muted);
}
.status .error { color: var(--danger); }
.badge { font-weight: 600; }
.badge.ok { color: var(--ok); }
.badge.warn { color: var(--warn); }
.badge.bad { color: var(--danger); }
footer { padding-bottom: 28px; color: var(--muted); font-size: 13px; }
code { font-family: var(--mono); }