:root {
  color-scheme: light;
  --bg: #f4f7f2;
  --panel: #ffffff;
  --text: #17211b;
  --muted: #5b675f;
  --border: #c8d7cc;
  --accent: #146c43;
  --accent-strong: #0d5c38;
  --code-bg: #101713;
  --code-text: #e8f3ec;
  --code-muted: #7f9789;
  --code-border: rgba(16, 23, 19, 0.14);
  --progress-bg: #dce8df;
  --progress-fill-start: #2da66d;
  --progress-fill-end: #237bd3;
  --shadow: 0 18px 45px rgba(25, 45, 32, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #07110d;
    --panel: #0d1b14;
    --text: #e7f3ec;
    --muted: #93aa9c;
    --border: #26382e;
    --accent: #48c982;
    --accent-strong: #68dfa0;
    --code-bg: #030806;
    --code-text: #e2f4ea;
    --code-muted: #6f8979;
    --code-border: rgba(226, 244, 234, 0.14);
    --progress-bg: #1b2b22;
    --progress-fill-start: #4bd687;
    --progress-fill-end: #4aa8ff;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.34);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 0%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 26rem),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.playground {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(22rem, 0.8fr);
  gap: 1rem;
  min-height: 100vh;
  padding: 1rem;
}

.playground__editor,
.playground__output {
  display: grid;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.playground__editor {
  grid-template-rows: auto 1fr;
}

.playground__output {
  grid-template-rows: auto auto 1fr;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
}

header p {
  margin: 0;
  font-weight: 700;
}

header small {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

button {
  border: 0;
  border-radius: 0.45rem;
  padding: 0.55rem 0.9rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

button:hover {
  background: var(--accent-strong);
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

textarea,
pre {
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
  padding: 1rem;
  background: var(--code-bg);
  color: var(--code-text);
  font: 0.95rem/1.55 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  tab-size: 4;
}

.editor-frame {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  min-height: 0;
  background: var(--code-bg);
}

#line-numbers {
  width: auto;
  min-width: 3.5rem;
  padding-right: 0.75rem;
  overflow: hidden;
  color: var(--code-muted);
  text-align: right;
  user-select: none;
  border-right: 1px solid var(--code-border);
}

textarea {
  resize: none;
  outline: none;
  overflow: auto;
}

pre {
  overflow: auto;
  white-space: pre-wrap;
}

.progress {
  height: 0.35rem;
  background: var(--progress-bg);
}

.progress span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--progress-fill-start), var(--progress-fill-end));
  transition: width 180ms ease;
}

#status {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 860px) {
  .playground {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(24rem, 1fr) minmax(16rem, 0.7fr);
  }
}