:root {
    --grass: #1d5232;
    --stripe: #215b38;
    --chalk: #f2f4ee;
    --chalk-dim: #b9c7bb;
    --board: #191c1f;
    --board-edge: #2b3034;
    --led-green: #3be27c;
    --led-red: #ff4f4f;
    --led-amber: #ffb547;
    --card: #d7262e;
    --card-dark: #a3151c;
    --display: "Barlow Condensed", "Avenir Next Condensed", "Roboto Condensed", "Arial Narrow", system-ui, sans-serif;
    --text: "Barlow", system-ui, -apple-system, "Segoe UI", sans-serif;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; }
  body {
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--chalk);
    font: 400 16px/1.45 var(--text);
    background-color: var(--grass);
    /* mown stripes */
    background-image: repeating-linear-gradient(180deg, var(--grass) 0 56px, var(--stripe) 56px 112px);
    display: flex;
    justify-content: center;
    padding: max(20px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
  }
  main { width: 100%; max-width: 440px; display: flex; flex-direction: column; gap: 22px; }
  #app { display: flex; flex-direction: column; gap: 22px; }

  header { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
  h1 { margin: 0; font: 700 26px/1 var(--display); letter-spacing: .01em; }
  #updated { color: var(--chalk-dim); font-size: 13px; text-align: right; }
  #updated.offline { color: var(--led-amber); }

  .boards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .board {
    background: var(--board);
    border: 2px solid var(--board-edge);
    border-radius: 10px;
    padding: 12px 12px 14px;
    display: flex; flex-direction: column; gap: 8px;
    box-shadow: 0 6px 0 rgba(0,0,0,.22);
    min-width: 0;
  }
  .board h2 { margin: 0; font: 600 20px/1 var(--display); color: var(--chalk); }
  .led {
    font: 700 clamp(20px, 6.6vw, 32px)/1.05 var(--display);
    font-stretch: condensed;
    letter-spacing: .02em;
    padding: 10px 0 8px;
    border-top: 1px solid var(--board-edge);
    border-bottom: 1px solid var(--board-edge);
    /* dot-matrix screen behind the word */
    background-image: radial-gradient(rgba(255,255,255,.06) 1px, transparent 1.4px);
    background-size: 5px 5px;
  }
  .sending .led { color: var(--led-green); text-shadow: 0 0 10px rgba(59,226,124,.55); }
  .stopped .led { color: var(--led-red);   text-shadow: 0 0 10px rgba(255,79,79,.55); }
  .down .led, .restarting .led { color: var(--led-amber); text-shadow: 0 0 10px rgba(255,181,71,.45); }
  .actions { display: grid; gap: 8px; margin-top: auto; padding-top: 4px; }
  .restart {
    font: 600 15px/1 var(--display);
    color: var(--chalk-dim);
    background: transparent;
    border: 1px solid var(--board-edge);
    border-radius: 999px;
    padding: 8px 12px;
    cursor: pointer;
  }
  .restart:disabled { opacity: .55; cursor: default; }
  .warn { color: var(--led-amber); }
  .facts { margin: 0; padding: 0; list-style: none; font-size: 13.5px; color: var(--chalk-dim); display: grid; gap: 3px; }
  .facts b { color: var(--chalk); font-weight: 500; }
  .resume {
    font: 600 17px/1 var(--display);
    color: var(--chalk);
    background: transparent;
    border: 2px solid var(--chalk);
    border-radius: 999px;
    padding: 9px 12px;
    cursor: pointer;
  }
  .resume[hidden] { display: none; }

  .stop-wrap { display: flex; flex-direction: column; align-items: center; gap: 12px; padding-top: 6px; }
  #stop {
    width: min(52vw, 200px);
    aspect-ratio: 2 / 3;
    border: 0;
    border-radius: 14px;
    background: linear-gradient(160deg, #e2333b 0%, var(--card) 45%, var(--card-dark) 100%);
    color: #fff;
    font: 700 clamp(30px, 10vw, 46px)/1 var(--display);
    font-stretch: condensed;
    letter-spacing: .02em;
    cursor: pointer;
    box-shadow: 0 14px 0 rgba(0,0,0,.25), inset 0 0 0 3px rgba(255,255,255,.12);
    transform: rotate(-4deg);
    transition: transform .18s ease-out, box-shadow .18s ease-out, filter .2s;
    -webkit-tap-highlight-color: transparent;
  }
  #stop:active { transform: rotate(-4deg) translateY(4px); box-shadow: 0 8px 0 rgba(0,0,0,.25); }
  #stop.shown { transform: rotate(4deg) translateY(-10px); filter: saturate(.8); }
  #stop:disabled { cursor: default; }
  #stop-note { margin: 0; text-align: center; font-size: 14.5px; color: var(--chalk); max-width: 32ch; }

  #error { margin: 0; padding: 10px 12px; border-radius: 8px; background: rgba(0,0,0,.35); color: var(--led-amber); font-size: 14px; }
  #error[hidden] { display: none; }

  .locked .led, .lock .led { color: var(--led-amber); text-shadow: 0 0 10px rgba(255,181,71,.45); }
  .lock { display: flex; flex-direction: column; gap: 18px; padding-top: 8vh; }
  .lock .board { padding: 16px; gap: 12px; }
  .lock-note { margin: 0; color: var(--chalk-dim); font-size: 15px; }
  .unlock {
    font: 700 22px/1 var(--display);
    color: var(--board);
    background: var(--chalk);
    border: 0;
    border-radius: 999px;
    padding: 14px 18px;
    cursor: pointer;
  }
  .linkish {
    font: 500 15px/1.2 var(--text);
    color: var(--chalk-dim);
    background: none;
    border: 0;
    padding: 6px 0;
    text-decoration: underline;
    text-underline-offset: 3px;
    cursor: pointer;
    justify-self: start;
  }
  #pw-form { display: grid; gap: 8px; }
  #pw-form[hidden] { display: none; }
  #pw-form label { font-size: 14px; color: var(--chalk-dim); }
  #pw-form input {
    font: 500 18px/1.2 var(--text);
    color: var(--chalk);
    background: #0f1113;
    border: 1px solid var(--board-edge);
    border-radius: 8px;
    padding: 12px;
    width: 100%;
  }
  .offer {
    background: rgba(0,0,0,.28);
    border: 1px solid rgba(242,244,238,.25);
    border-radius: 10px;
    padding: 12px;
    display: grid;
    gap: 10px;
  }
  .offer[hidden] { display: none; }
  .offer p { margin: 0; }
  .offer-actions { display: flex; gap: 14px; align-items: center; }
  .foot { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; justify-content: space-between;
          color: var(--chalk-dim); font-size: 14px; padding-top: 8px; }
  .foot .linkish { padding: 4px 0; }
  [hidden] { display: none !important; }
  button:focus-visible, input:focus-visible { outline: 3px solid var(--led-amber); outline-offset: 3px; }
  .sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

  @media (max-width: 340px) { .boards { grid-template-columns: 1fr; } }
  @media (prefers-reduced-motion: reduce) { #stop, #stop.shown { transition: none; } }

  .recent h2 { margin: 0 0 8px; font: 600 20px/1 var(--display); }
  .recent-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
  .recent-list li { background: rgba(0,0,0,.28); border-radius: 8px; padding: 9px 11px;
                    display: grid; gap: 2px; font-size: 14px; }
  .recent-list .head { display: flex; gap: 8px; align-items: baseline; }
  .recent-list .time { color: var(--chalk-dim); font-variant-numeric: tabular-nums; }
  .recent-list .tag { font: 600 13px/1 var(--display); color: var(--board); background: var(--chalk-dim);
                      border-radius: 4px; padding: 3px 6px; }
  .recent-list .tag.prod { background: var(--chalk); }
  .recent-list .alert { font-weight: 500; }
  .recent-list .meta { color: var(--chalk-dim); font-size: 13px; }
  .recent-list .meta.warn { color: var(--led-amber); }
  .muted { color: var(--chalk-dim); font-size: 14px; margin: 0; }
  .learned { background: rgba(0,0,0,.2); border-radius: 10px; padding: 10px 12px; }
  .learned summary { cursor: pointer; font: 600 18px/1.2 var(--display); }
  .learned h3 { margin: 12px 0 4px; font: 600 16px/1 var(--display); }
  .learned ul { margin: 0; padding-left: 18px; color: var(--chalk-dim); font-size: 14px; display: grid; gap: 3px; }