:root {
    --bg: #0e0e0e;
    --fg: #d8d4cc;
    --dim: #6b675f;
    --branch: #e8e2d4;
    --verbatim: #7d8b6a;
    --backoff: #8a6d5a;
    --line: #262420;
  }

  * {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font: 14px/1.6 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  }

  header {
    padding: 18px 22px 10px;
    border-bottom: 1px solid var(--line);
  }

  h1 {
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: .04em;
  }

  .sub {
    color: var(--dim);
    font-size: 12px;
    margin-top: 4px;
  }

  main {
    padding: 18px 22px;
    max-width: 920px;
  }

  textarea {
    width: 100%;
    min-height: 78px;
    background: #141310;
    color: var(--fg);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 11px 13px;
    font: inherit;
    resize: vertical;
  }

  .controls {
    display: flex;
    flex-wrap: wrap;
    gap: 18px 26px;
    align-items: center;
    margin: 14px 0;
    color: var(--dim);
  }

  .controls label {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  input[type=range] {
    width: 130px;
    accent-color: #9a8f7a;
  }

  select,
  button {
    background: #1a1916;
    color: var(--fg);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 5px 11px;
    font: inherit;
    cursor: pointer;
  }

  button:hover {
    border-color: #4a463e;
  }

  .val {
    color: var(--fg);
    min-width: 30px;
    display: inline-block;
  }

  #out {
    margin-top: 16px;
    padding: 15px 16px;
    border: 1px solid var(--line);
    border-radius: 6px;
    min-height: 120px;
    background: #121110;
    white-space: pre-wrap;
  }

  #out .seed {
    color: var(--dim);
  }

  .branch {
    color: var(--branch);
  }

  .verbatim {
    color: var(--verbatim);
  }

  .backoff {
    color: var(--backoff);
  }

  .stats {
    margin-top: 12px;
    color: var(--dim);
    font-size: 12px;
  }

  .legend {
    display: flex;
    gap: 18px;
    margin-top: 8px;
    font-size: 12px;
    color: var(--dim);
  }

  .swatch {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    margin-right: 5px;
    vertical-align: middle;
  }

  kbd {
    background: #1a1916;
    border: 1px solid var(--line);
    border-radius: 3px;
    padding: 0 5px;
  }