:root {
  --navy: #0b1730;
  --navy2: #14254a;
  --gold: #d9a441;
  --white: #f4f1e8;
  --dim: #8d97ad;
  --bad: #e5604d;
  --good: #5cc08a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: #000;
  color: var(--white);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

/* ---------- display page (TV) ---------- */

#stage { position: fixed; inset: 0; background: #000; }

#v, #still {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  visibility: hidden;
}
#v.on, #still.on { visibility: visible; }

.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--navy);
  padding: 4vh 6vw;
}
.screen.on { display: flex; }

.brand { font-size: 3vw; letter-spacing: 0.5em; color: var(--gold); margin: 0 0 3vh; text-transform: uppercase; }
.big { font-size: 7vw; font-weight: 700; margin: 0; letter-spacing: 0.04em; }
.sub { font-size: 2.2vw; color: var(--dim); margin: 2vh 0 0; }
.code { font-size: 9vw; font-weight: 800; letter-spacing: 0.25em; color: var(--gold); font-variant-numeric: tabular-nums; margin: 3vh 0; }
.warn { font-size: 1.8vw; color: var(--bad); margin: 2vh 0 0; min-height: 2.4vw; }

.row { display: flex; gap: 2vw; flex-wrap: wrap; justify-content: center; margin-top: 3vh; max-width: 90vw; }

button {
  font: inherit;
  font-size: 2.4vw;
  font-weight: 600;
  color: var(--white);
  background: var(--navy2);
  border: 0.4vw solid #2b3c66;
  border-radius: 1.2vw;
  padding: 1.6vh 2.6vw;
  cursor: pointer;
}
button:focus { outline: none; border-color: var(--gold); background: #1d3366; transform: scale(1.04); }
button.primary { background: var(--gold); color: var(--navy); border-color: var(--gold); }
button.primary:focus { border-color: var(--white); background: #f0bd5a; }

/* Holding screen once linked: code moves to a corner and shrinks. */
#screen-hold.linked .code { font-size: 1.6vw; position: absolute; right: 3vw; bottom: 3vh; margin: 0; letter-spacing: 0.2em; opacity: 0.55; }
#screen-hold.linked #hold-title { opacity: 0.9; }

#debug {
  display: none;
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 10;
  padding: 0.6vh 1vw;
  font: 1.5vw/1.3 ui-monospace, Menlo, Consolas, monospace;
  color: #9dffb4;
  background: rgba(0, 0, 0, 0.75);
  pointer-events: none;
}
#debug.on { display: block; }

/* ---------- sender page (phone / tablet) ---------- */

body.sender { overflow: auto; background: var(--navy); }
.wrap { max-width: 640px; margin: 0 auto; padding: 18px 16px 48px; }
.wrap h1 { font-size: 20px; letter-spacing: 0.2em; color: var(--gold); text-transform: uppercase; margin: 6px 0 14px; }
.wrap p.note { color: var(--dim); font-size: 14px; margin: 6px 0 14px; }

.card { background: var(--navy2); border: 1px solid #2b3c66; border-radius: 12px; padding: 14px; margin: 0 0 14px; }

.wrap label { display: block; font-size: 13px; color: var(--dim); margin: 0 0 6px; }
.wrap input {
  width: 100%;
  font: inherit;
  font-size: 28px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  text-align: center;
  color: var(--white);
  background: #0a1429;
  border: 2px solid #2b3c66;
  border-radius: 10px;
  padding: 10px;
}
.wrap input:focus { outline: none; border-color: var(--gold); }

.wrap button { font-size: 17px; border-width: 2px; border-radius: 10px; padding: 14px 12px; width: 100%; }
.wrap button.primary { margin-top: 12px; }
.wrap button:disabled { opacity: 0.4; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid button.stop { grid-column: 1 / -1; background: #5b1f1a; border-color: #a53a30; }

.status { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 14px; }
.status dt { color: var(--dim); }
.status dd { margin: 0; font-variant-numeric: tabular-nums; }
.good { color: var(--good); }
.bad { color: var(--bad); }

#log { font: 12px/1.5 ui-monospace, Menlo, Consolas, monospace; color: var(--dim); white-space: pre-wrap; max-height: 180px; overflow: auto; }
.msg { min-height: 20px; font-size: 14px; color: var(--bad); margin-top: 8px; }

.wrap button + button { margin-top: 10px; }
.wrap button#end { background: #5b1f1a; border-color: #a53a30; }