:root {
  --accent: #1d4ed8;
  --accent-dark: #1e3a8a;
  --text: #111827;
  --muted: #4b5563;
  --bg: #ffffff;
  --panel: #eef2ff;
  --good: #166534;
  --bad: #9a3412;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.app {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
}

[hidden] { display: none !important; }

h1 {
  font-size: 2rem;
  text-align: center;
  margin: 8px 0 4px;
}

.hint {
  text-align: center;
  color: var(--muted);
  font-size: 1.125rem;
  margin: 0 0 16px;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 12px;
  min-height: 56px;
  touch-action: manipulation;
}

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

.tables {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.table-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 1.75rem;
  font-weight: 700;
}

.table-btn .best {
  font-size: 1rem;
  font-weight: 500;
  margin-top: 4px;
}

.progress {
  text-align: center;
  color: var(--muted);
  font-size: 1.125rem;
  margin: 8px 0;
}

.question {
  text-align: center;
  font-size: 3rem;
  font-weight: 700;
  margin: 8px 0;
}

.answer {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  min-height: 64px;
  line-height: 64px;
  margin: 0 auto 8px;
  max-width: 200px;
  border-bottom: 4px solid var(--accent);
}

.feedback {
  text-align: center;
  font-size: 1.375rem;
  font-weight: 700;
  min-height: 2em;
  margin: 8px 0;
}

.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.keypad button {
  min-height: 64px;
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--panel);
  color: var(--text);
}

.keypad button:active { background: #c7d2fe; }

.keypad .ok {
  background: var(--accent);
  color: #fff;
}

.keypad button:disabled { opacity: 0.5; }

#result {
  text-align: center;
}

.result-message {
  font-size: 2rem;
  font-weight: 700;
  margin: 32px 0 8px;
}

.new-best {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--good);
  margin: 0 0 16px;
}

.big {
  display: block;
  width: 100%;
  margin-top: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
}

.big.secondary {
  background: var(--panel);
  color: var(--accent-dark);
}