:root {
  --bg: #0d1117;
  --panel: #161b22;
  --accent: #238636;
  --text: #c9d1d9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  gap: 16px;
}

.header h1 {
  margin: 0;
  font-size: 28px;
}

.subtitle {
  margin: 4px 0 0;
  font-size: 14px;
  color: #8b949e;
}

.controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

select, button {
  padding: 10px 14px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
}

select {
  background: var(--panel);
  color: var(--text);
}

button {
  background: var(--accent);
  color: white;
  cursor: pointer;
}

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

textarea {
  width: 90%;
  height: 220px;
  background: var(--panel);
  color: var(--text);
  border: none;
  padding: 14px;
  font-family: monospace;
  border-radius: 10px;
}

.loading {
  font-size: 14px;
  color: #8b949e;
}

.hidden {
  display: none;
}

#previewWrapper {
  display: inline-block;
  padding: 0;
  margin: 0;
  background: #1e1e1e;
}

#previewWrapper pre {
  margin: 0;
  display: inline-block;
  white-space: pre;
}

img {
  max-width: 90%;
  border-radius: 10px;
}

.footer {
  margin-top: 20px;
  font-size: 12px;
  color: #8b949e;
}