html, body { margin: 0; height: 100%; background: #0c0d0c; color: #c9d4c4; }
body {
  font: 15px/1.45 ui-monospace, Consolas, monospace;
  display: flex;
  flex-direction: column;
}
header, footer, #ok, #err {
  padding: 0.7rem 1rem;
}
header { border-bottom: 1px solid #232823; color: #7d8a76; }
textarea {
  flex: 1;
  width: 100%;
  border: 0;
  resize: none;
  background: transparent;
  color: inherit;
  font: inherit;
  padding: 1rem;
  outline: none;
}
footer {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid #232823;
}
button {
  font: inherit;
  background: #3d5a34;
  color: #e8f0e4;
  border: 0;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}
#err { color: #c97868; }
#ok { display: flex; gap: 0.5rem; align-items: center; }
#ok[hidden] { display: none; }
#ok input {
  flex: 1;
  background: #161816;
  border: 1px solid #2a302a;
  color: inherit;
  font: inherit;
  padding: 0.4rem 0.5rem;
}
pre {
  white-space: pre-wrap;
  word-break: break-word;
  padding: 1rem;
  margin: 0;
}