:root {
  --bg-a: #f3f0e4;
  --bg-b: #c6dbcc;
  --card-bg: #fbfaf6;
  --ink: #1f2a2a;
  --ink-soft: #4f6161;
  --accent: #1f5f4f;
  --accent-2: #7b2f2f;
  --line: #c9d5ca;
  --mono: "IBM Plex Mono", "Fira Code", "SFMono-Regular", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.6), transparent 40%),
    radial-gradient(circle at 90% 85%, rgba(255, 255, 255, 0.35), transparent 45%),
    linear-gradient(135deg, var(--bg-a), var(--bg-b));
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.editor-card {
  width: min(980px, 100%);
  border: 1px solid var(--line);
  background: var(--card-bg);
  border-radius: 14px;
  box-shadow: 0 16px 40px rgba(31, 42, 42, 0.14);
  overflow: hidden;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  padding: 14px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #fefaf0, #edf7ef);
}

.github-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.github-link:hover {
  text-decoration: underline;
}

.controls {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  min-width: 260px;
}

.controls label {
  color: var(--ink-soft);
  font-size: 0.86rem;
}

#example-select,
#execute-btn,
#output {
  font: inherit;
}

#example-select,
#execute-btn,
#output,
.CodeMirror {
  border: 1px solid var(--line);
  border-radius: 8px;
}

#example-select,
#execute-btn {
  padding: 10px 12px;
}

#execute-btn {
  border-color: transparent;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

#execute-btn:hover {
  filter: brightness(0.95);
}

#execute-btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.CodeMirror {
  height: 360px;
  margin: 14px;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
}

.output-wrap {
  padding: 0 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.output-wrap label {
  color: var(--ink-soft);
  font-size: 0.86rem;
}

#output {
  width: 100%;
  min-height: 170px;
  resize: vertical;
  padding: 12px;
  font-family: var(--mono);
  background: #fff;
}

@media (max-width: 820px) {
  .toolbar {
    flex-direction: column;
  }

  .controls {
    min-width: unset;
    width: 100%;
  }

  .CodeMirror {
    height: 300px;
  }
}