:root {
  --bg-1: #f2f9ff;
  --bg-2: #e6f4ff;
  --ink: #102a43;
  --muted: #486581;
  --card: #ffffff;
  --accent: #0b7285;
  --accent-2: #0f9db3;
  --ok: #1f9d55;
  --bad: #d64545;
  --font-scale: 1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: radial-gradient(circle at 20% 20%, var(--bg-1), var(--bg-2) 70%);
  color: var(--ink);
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
}

.screen {
  display: none;
}

.screen.active {
  display: block;
}

h1 {
  margin: 8px 0;
  font-size: 2rem;
}

h2 {
  margin: 0;
}

#catalog {
  margin-top: 18px;
}

.category-block {
  background: #ffffffc9;
  border: 1px solid #d7e8f5;
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 14px;
}

.category-title {
  margin: 2px 0 10px;
  font-size: 1.1rem;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 8px;
}

.subgroup-title {
  margin: 14px 0 8px;
  font-weight: 800;
  color: #1f445f;
}

.btn {
  border: 1px solid #c5d9e8;
  background: #fff;
  color: var(--ink);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  font-size: calc(1rem * var(--font-scale));
}

.btn:hover {
  filter: brightness(0.98);
}

.btn.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #fff;
  border: none;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.game-title {
  font-weight: 800;
  color: var(--muted);
  font-size: calc(1rem * var(--font-scale));
}

.font-controls {
  display: flex;
  gap: 8px;
}

.stats {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-weight: 700;
  font-size: calc(1rem * var(--font-scale));
}

.card {
  margin: 18px 0;
  background: var(--card);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 8px 20px rgba(16, 42, 67, 0.08);
}

.label {
  margin: 0;
  color: var(--muted);
  font-size: calc(0.95rem * var(--font-scale));
}

#wordText {
  margin: 8px 0 0;
  font-size: calc(2.2rem * var(--font-scale));
}

#wordText.speakable {
  cursor: pointer;
}

#wordText.speakable:hover {
  text-decoration: underline;
}

.choices {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.choice {
  text-align: left;
  background: #fff;
}

.choice.correct {
  border-color: var(--ok);
  color: var(--ok);
}

.choice.wrong {
  border-color: var(--bad);
  color: var(--bad);
}

.feedback {
  min-height: 24px;
  margin: 14px 0;
  font-weight: 700;
  font-size: calc(1rem * var(--font-scale));
}

@media (max-width: 640px) {
  .app {
    padding: 14px;
  }

  #wordText {
    font-size: 1.6rem;
  }

  .game-grid {
    grid-template-columns: 1fr;
  }
}