:root {
  --fg: #1a1a1a;
  --fg-muted: #6a6a6a;
  --bg: #fafaf7;
  --panel: #ffffff;
  --border: #e0e0d8;
  --accent: #b85c00;
  --accent-bg: #fff4e8;
  --error: #b22222;
  --code-bg: #f3f1ec;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, "Courier New", monospace;
}

* { box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  line-height: 1.55;
}

header, main, footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

header {
  padding-top: 2.5rem;
  padding-bottom: 1rem;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  font-weight: 700;
}

.lede {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: var(--fg-muted);
}

.links {
  margin: 0;
  font-size: 0.95rem;
  color: var(--fg-muted);
}

.links a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.links a:hover { border-bottom-color: var(--accent); }

.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  max-width: 880px;
  margin: 1.5rem auto 0;
  padding: 0 1.5rem;
}

.tab {
  background: none;
  border: 1px solid transparent;
  border-bottom: none;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
  font: inherit;
  color: var(--fg-muted);
  border-radius: 6px 6px 0 0;
  position: relative;
  top: 1px;
}

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

.tab.active {
  background: var(--panel);
  border-color: var(--border);
  color: var(--fg);
  font-weight: 600;
}

.badge {
  background: var(--accent-bg);
  color: var(--accent);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.75rem;
  font-weight: 500;
  margin-left: 0.4rem;
}

.panel {
  display: none;
  padding: 1.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0 6px 6px 6px;
  margin-bottom: 1.5rem;
}

.panel.active { display: block; }

.blurb {
  margin-top: 0;
  color: var(--fg-muted);
}

.blurb code {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.95em;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin: 1rem 0 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sample-select {
  font: inherit;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  margin-bottom: 0.75rem;
  width: 100%;
  max-width: 400px;
}

.program, .preview {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--code-bg);
  resize: vertical;
  line-height: 1.5;
}

.preview {
  white-space: pre-wrap;
  word-break: break-word;
}

.controls {
  margin-top: 0.75rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

button.run, button#translate-go {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.55rem 1.4rem;
  font: inherit;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
}

button.run:hover, button#translate-go:hover {
  background: #9c4d00;
}

button.run:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.status.error { color: var(--error); }

.output {
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 2.5rem;
}

.output:empty::before {
  content: "(no output yet)";
  color: var(--fg-muted);
  font-style: italic;
}

.output.error {
  color: var(--error);
  border-color: var(--error);
}

details.translator {
  margin: 0 0 1rem;
  padding: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
}

details.translator summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 0.95rem;
}

details.translator > textarea {
  margin-top: 0.75rem;
}

details.translator > button {
  margin-top: 0.5rem;
}

footer {
  padding: 2rem 1.5rem 3rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
}

footer a {
  color: var(--accent);
  text-decoration: none;
}
footer a:hover { text-decoration: underline; }

@media (max-width: 600px) {
  header h1 { font-size: 1.6rem; }
  .lede { font-size: 1rem; }
  .tabs { flex-wrap: wrap; padding: 0 1rem; }
  .panel { padding: 1rem; border-radius: 6px; }
}