:root {
    --navy:   #0A1F44;
    --navy-2: #102B57;
    --navy-3: #1E3A6B;
    --gold:   #C9A227;
    --gold-2: #E0BC4A;
    --paper:  #F7F5EF;
    --paper-2:#EAE6DA;

    --bg:     var(--paper);
    --surface:#FFFFFF;
    --ink:    var(--navy);
    --muted:  #5A6478;
    --rule:   #CFCABA;
    --good:   #1F6B4A;
    --bad:    #A32B2B;
    --key-bg: var(--navy);
    --key-ink:var(--paper);

    --f-d: "Barlow Condensed", "Helvetica Neue", Arial, sans-serif;
    --f-b: "Barlow", system-ui, -apple-system, sans-serif;
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg:      #06152E;
      --surface: #0D2249;
      --ink:     #F2EFE5;
      --muted:   #9AA6BE;
      --rule:    #1E3A6B;
      --good:    #4FBF8B;
      --bad:     #E8736F;
      --key-bg:  #C9A227;
      --key-ink: #06152E;
    }
  }
  :root[data-theme="dark"] {
    --bg:      #06152E;
    --surface: #0D2249;
    --ink:     #F2EFE5;
    --muted:   #9AA6BE;
    --rule:    #1E3A6B;
    --good:    #4FBF8B;
    --bad:     #E8736F;
    --key-bg:  #C9A227;
    --key-ink: #06152E;
  }

  * { box-sizing: border-box; }

  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--f-b);
    font-size: 17px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
  }

  h1, h2, h3 { font-family: var(--f-d); margin: 0; line-height: 1.04; text-wrap: balance; }

  .lbl {
    font-family: var(--f-d);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0;
  }

  /* ---------- prototype bar ---------- */
  #protobar {
    position: sticky; top: 0; z-index: 50;
    display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
    padding: 8px 14px;
    background: var(--navy); color: var(--paper);
    border-bottom: 2px solid var(--gold);
  }
  #protobar .tagline {
    font-family: var(--f-d); font-size: 0.82rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--gold-2); margin-right: auto;
  }
  #protobar button {
    font-family: var(--f-d); font-size: 0.9rem; letter-spacing: 0.1em;
    text-transform: uppercase; font-weight: 600;
    background: transparent; color: var(--paper);
    border: 1px solid rgba(247,245,239,0.35);
    padding: 7px 12px; border-radius: 2px; cursor: pointer; min-height: 38px;
  }
  #protobar button[aria-pressed="true"] { background: var(--gold); border-color: var(--gold); color: var(--navy); }

  /* ---------- shared shell ---------- */
  .pad { padding: 20px 18px 40px; max-width: 640px; margin: 0 auto; }
  .stack { display: flex; flex-direction: column; gap: 16px; }
  .row2 { display: flex; flex-wrap: wrap; gap: 10px; }

  .card {
    background: var(--surface);
    border: 1px solid var(--rule);
    border-radius: 3px;
    padding: 16px;
  }

  .btn {
    font-family: var(--f-d); font-weight: 600;
    font-size: 1.05rem; letter-spacing: 0.08em; text-transform: uppercase;
    background: var(--navy); color: var(--paper);
    border: 1px solid var(--navy);
    padding: 14px 20px; border-radius: 2px; cursor: pointer;
    min-height: 50px; width: 100%;
  }
  .btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
  .btn.gold { background: var(--gold); border-color: var(--gold); color: var(--navy); }
  .btn:disabled { opacity: 0.45; cursor: not-allowed; }

  /* option buttons: the one repeated object across every game */
  .opts { display: flex; flex-direction: column; gap: 10px; }
  .opt {
    display: flex; align-items: flex-start; gap: 12px;
    text-align: left; width: 100%;
    background: var(--surface); color: var(--ink);
    border: 1px solid var(--rule); border-radius: 3px;
    padding: 14px; min-height: 56px; cursor: pointer;
    font-family: var(--f-b); font-size: 1rem; line-height: 1.35;
  }
  .opt .key {
    flex: 0 0 auto;
    font-family: var(--f-d); font-weight: 700; font-size: 1rem;
    width: 28px; height: 28px; border-radius: 50%;
    display: grid; place-items: center;
    background: var(--key-bg); color: var(--key-ink);
  }
  .opt[aria-pressed="true"] { border-color: var(--gold); box-shadow: inset 0 0 0 1px var(--gold); }
  .opt.correct { border-color: var(--good); box-shadow: inset 0 0 0 1px var(--good); }
  .opt.wrong { border-color: var(--bad); box-shadow: inset 0 0 0 1px var(--bad); }
  .opt.correct .key { background: var(--good); }
  .opt.wrong .key { background: var(--bad); }
  .opt:disabled { cursor: default; }

  .meta { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: baseline; }
  .chip {
    font-family: var(--f-d); font-size: 0.85rem; letter-spacing: 0.1em;
    text-transform: uppercase; font-weight: 600;
    border: 1px solid var(--rule); color: var(--muted);
    padding: 3px 9px; border-radius: 2px;
  }
  .chip.live { border-color: var(--gold); color: var(--gold); }

  .timer {
    font-family: var(--f-d); font-weight: 700; font-size: 1.4rem;
    font-variant-numeric: tabular-nums; color: var(--gold);
  }
  .timer.low { color: var(--bad); }

  .verdict { font-family: var(--f-d); font-size: 1.5rem; font-weight: 700; }
  .verdict.good { color: var(--good); }
  .verdict.bad { color: var(--bad); }

  .why { color: var(--muted); font-size: 0.97rem; margin: 6px 0 0; }

  .field { display: flex; flex-direction: column; gap: 6px; }
  .field input, .field select {
    font-family: var(--f-b); font-size: 1.05rem;
    padding: 13px 12px; min-height: 50px;
    border: 1px solid var(--rule); border-radius: 2px;
    background: var(--surface); color: var(--ink);
    width: 100%;
  }

  .callsign {
    font-family: var(--f-d); font-weight: 700;
    font-size: clamp(2.6rem, 14vw, 4.2rem);
    letter-spacing: 0.04em; color: var(--gold); line-height: 1;
  }

  svg.art { display: block; width: 100%; height: auto; border-radius: 2px; }

  .ph {
    border: 2px dashed var(--rule);
    border-radius: 3px;
    padding: 26px 18px;
    text-align: center;
    color: var(--muted);
    background: transparent;
  }
  .ph strong { display: block; font-family: var(--f-d); font-size: 1.25rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); }

  .board { display: flex; flex-direction: column; gap: 6px; }
  .brow {
    display: grid; grid-template-columns: 34px 1fr auto; gap: 12px; align-items: center;
    padding: 9px 12px; border: 1px solid var(--rule); border-radius: 2px;
    background: var(--surface);
    font-variant-numeric: tabular-nums;
  }
  .brow.me { border-color: var(--gold); box-shadow: inset 0 0 0 1px var(--gold); }
  .brow .rank { font-family: var(--f-d); font-weight: 700; color: var(--muted); }
  .brow .pts { font-family: var(--f-d); font-weight: 700; font-size: 1.15rem; color: var(--gold); }
  .demo { font-size: 0.82rem; color: var(--muted); font-style: italic; }

  .bars { display: flex; flex-direction: column; gap: 8px; }
  .bar { display: grid; grid-template-columns: 1fr; gap: 4px; }
  .bar .top { display: flex; justify-content: space-between; gap: 10px; font-size: 0.95rem; }
  .bar .track { height: 12px; background: var(--rule); border-radius: 2px; overflow: hidden; }
  .bar .fill { height: 100%; background: var(--gold); }
  .bar.is-right .fill { background: var(--good); }

  .dirs { display: grid; gap: 12px; }
  .dir3 { border-top: 3px solid var(--gold); background: var(--surface); padding: 14px; }
  .dir3 h3 { font-size: 1.35rem; margin-bottom: 4px; }
  .dir3 p { margin: 4px 0 0; font-size: 0.95rem; }
  .dir3 .who { color: var(--muted); font-size: 0.9rem; }

  /* ---------- front screen ---------- */
  #front {
    background: #06152E; color: #F2EFE5;
    min-height: calc(100vh - 58px);
    padding: 26px 30px 40px;
  }
  #front .fwrap { max-width: 1100px; margin: 0 auto; }
  #front h2 { font-size: clamp(2rem, 5.5vw, 3.6rem); color: #F2EFE5; }
  #front .lbl { color: var(--gold-2); font-size: clamp(0.9rem, 1.6vw, 1.1rem); }
  #front .strip { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 22px; }
  #front .step {
    font-family: var(--f-d); font-size: clamp(0.8rem, 1.4vw, 1rem);
    letter-spacing: 0.1em; text-transform: uppercase;
    border: 1px solid rgba(224,188,74,0.4); color: rgba(242,239,229,0.6);
    padding: 5px 10px; border-radius: 2px;
  }
  #front .step.now { background: var(--gold); border-color: var(--gold); color: var(--navy); }
  #front .step.done { color: rgba(242,239,229,0.35); }
  #front .fgrid { display: grid; grid-template-columns: 1fr; gap: 24px; }
  #front .bar .track { background: rgba(242,239,229,0.15); }
  #front .brow { background: rgba(242,239,229,0.06); border-color: rgba(242,239,229,0.18); }
  #front .fbig {
    font-family: var(--f-d); font-weight: 700;
    font-size: clamp(3rem, 12vw, 8rem); color: var(--gold); line-height: 0.95;
  }
  #front .qr {
    background: #F2EFE5; color: #06152E; padding: 14px; border-radius: 3px;
    display: inline-flex; flex-direction: column; align-items: center; gap: 6px;
  }
  #front .demo { color: rgba(242,239,229,0.5); }
  @media (min-width: 820px) {
    #front .fgrid.two { grid-template-columns: 1.4fr 1fr; }
  }

  /* ---------- instructor ---------- */
  .ilist { display: flex; flex-direction: column; gap: 8px; }
  .toggle {
    display: flex; align-items: center; gap: 12px;
    border: 1px solid var(--rule); border-radius: 2px;
    padding: 12px 14px; min-height: 52px; cursor: pointer;
    background: var(--surface); color: var(--ink); width: 100%;
    font-family: var(--f-b); font-size: 1rem; text-align: left;
  }
  .toggle[aria-pressed="true"] { border-color: var(--gold); box-shadow: inset 0 0 0 1px var(--gold); }
  .toggle .box {
    width: 22px; height: 22px; border: 2px solid var(--rule); border-radius: 2px;
    display: grid; place-items: center; flex: 0 0 auto;
    font-family: var(--f-d); font-weight: 700; color: var(--navy);
  }
  .toggle[aria-pressed="true"] .box { background: var(--gold); border-color: var(--gold); }

  .note { font-size: 0.92rem; color: var(--muted); margin: 0; }

  :focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }

  @media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }