:root {
  --ink: #111;
  --muted: #666;
  --line: #d9d9d9;
  --bg: #fff;
  --accent: #2456d6;
  --danger: #b3261e;
  --danger-bg: #fdecea;
  --yes: #1a7f37;
  --no: #c62828;
  --radius: .65rem;
  color-scheme: light;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); line-height: 1.45; }
a { color: var(--accent); }
h1 { font-size: 1.4rem; margin: 0 0 1.25rem; }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 2px;
}

.card { max-width: 26rem; margin: 0 auto; padding: 2.5rem 1rem 3rem; }
.brand {
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.stack { display: grid; gap: 1rem; }
label { display: grid; gap: .35rem; font-weight: 600; font-size: .95rem; }
.hint { color: var(--muted); font-weight: 400; font-size: .85rem; }

input[type=email], input[type=password], input[type=text] {
  font: inherit;
  font-weight: 400;
  width: 100%;
  padding: .75rem .85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

button {
  font: inherit;
  cursor: pointer;
  padding: .75rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
}
button.primary { background: var(--ink); border-color: var(--ink); color: #fff; font-weight: 600; }
button:disabled { opacity: .5; cursor: default; }

.error {
  margin: 0 0 1rem;
  padding: .75rem .85rem;
  border-radius: var(--radius);
  background: var(--danger-bg);
  color: var(--danger);
}
.alt { margin-top: 1.5rem; color: var(--muted); }
.alt + .alt { margin-top: .5rem; }
.resend { margin-bottom: 1.5rem; }

/* Kids */
.topbar { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 1.25rem; }
.topbar h1 { margin: 0; }
.link-button { background: none; border: none; padding: .25rem; color: var(--muted); text-decoration: underline; }
.kids { list-style: none; margin: 0 0 1.5rem; padding: 0; display: grid; gap: .75rem; }
.kid {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.kid-info { flex: 1; min-width: 0; }
.kid-name { font-weight: 600; overflow-wrap: anywhere; }
.kid-meta { color: var(--muted); font-size: .85rem; }
.kid form { margin: 0; }
.play-link {
  padding: .55rem 1rem;
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}
.empty { color: var(--muted); margin: 0 0 1.5rem; }
.add { display: flex; gap: .5rem; }
.add input { flex: 1; min-width: 0; }

/* Play: white screen, huge black symbol, Yes/No for the parent below. */
body.play { height: 100vh; height: 100dvh; overflow: hidden; background: #fff; }
#stage { height: 100vh; height: 100dvh; display: grid; grid-template-rows: 1fr auto; }
.symbol {
  display: grid;
  place-items: center;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
  font-size: min(calc(100vh - 10rem), 95vw);
  font-size: min(calc(100dvh - 10rem), 95vw);
  line-height: 1;
  color: #000;
  user-select: none;
  -webkit-user-select: none;
}
.answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1rem 1rem max(1rem, env(safe-area-inset-bottom));
  margin: 0;
}
.answers button {
  padding: 1.1rem;
  border: none;
  border-radius: 1rem;
  color: #fff;
  font-size: 1.75rem;
  font-weight: 700;
  touch-action: manipulation;
}
.answers .yes { background: var(--yes); }
.answers .no { background: var(--no); }
.back {
  position: fixed;
  top: .5rem;
  left: .5rem;
  padding: .5rem .75rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 1rem;
}

/* Score of the symbol on screen, for the parent. */
.score {
  position: fixed;
  top: .6rem;
  right: .9rem;
  max-width: 62vw;
  text-align: right;
  line-height: 1.3;
  pointer-events: none;
}
.score-value { font-weight: 700; font-size: 1rem; color: var(--ink); }
.score-note { font-size: .8rem; color: var(--muted); }

/* The answer just given: the letter's new score, shown for 2 seconds. */
.flash {
  position: fixed;
  top: 3.9rem;
  right: .9rem;
  max-width: 62vw;
  padding: .3rem .7rem;
  border: 2px solid currentColor;
  border-radius: var(--radius);
  background: #fff;
  text-align: right;
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.3;
  pointer-events: none;
  animation: flash-hide 0s 2s forwards;
}
.flash.right { color: var(--yes); }
.flash.wrong { color: var(--no); }
.flash-symbol { font-family: Arial, Helvetica, sans-serif; }
.flash-delta { font-size: .9rem; }
.flash-message { font-size: 1rem; color: var(--ink); }

@keyframes flash-hide {
  to { visibility: hidden; }
}