* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #1a1a2e;
  color: #eee;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

h1 {
  font-size: 1.6rem;
  color: #e94560;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.hidden { display: none !important; }

/* --- Mode select --- */
.mode-select {
  text-align: center;
  max-width: 520px;
  width: 100%;
}

.mode-subtitle {
  color: #a0a0b0;
  margin: 8px 0 28px;
  font-size: 1rem;
}

.mode-buttons {
  display: flex;
  gap: 16px;
}

.mode-btn {
  flex: 1;
  background: #16213e;
  border: 2px solid #0f3460;
  border-radius: 16px;
  padding: 28px 20px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: #eee;
}

.mode-btn:hover {
  border-color: #e94560;
  background: #1a2a4e;
}

.mode-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #e94560;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
}

.mode-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.mode-desc {
  font-size: 0.8rem;
  color: #a0a0b0;
  line-height: 1.4;
}

/* --- Top bar --- */
.top-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  width: 100%;
  max-width: 480px;
}

.back-btn {
  background: none;
  border: 1px solid #a0a0b0;
  color: #a0a0b0;
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.back-btn:hover {
  color: #e94560;
  border-color: #e94560;
}

/* --- Quiz screen --- */
.quiz-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.quiz-container {
  background: #16213e;
  border-radius: 16px;
  padding: 32px;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.scenario {
  background: #0f3460;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 20px;
  text-align: center;
}

.scenario-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #a0a0b0;
  margin-bottom: 4px;
}

.scenario-value {
  font-size: 1.05rem;
  font-weight: 600;
}

.cards {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 8px 0 16px;
}

.board-section {
  text-align: center;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid #0f3460;
}

.board-cards {
  gap: 8px;
}

.board-cards .card {
  width: 56px;
  height: 78px;
  font-size: 1.2rem;
}

.board-cards .card .rank { font-size: 1.1rem; }
.board-cards .card .suit { font-size: 1.3rem; }

.card {
  width: 72px;
  height: 100px;
  background: #fff;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.card.red { color: #d32f2f; }
.card.black { color: #222; }

.card .rank { font-size: 1.4rem; line-height: 1; }
.card .suit { font-size: 1.6rem; line-height: 1; }

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
}

.info-box {
  flex: 1;
  background: #0f3460;
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}

.question {
  font-size: 1.05rem;
  text-align: center;
  margin-bottom: 20px;
  color: #ccc;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.choice-btn {
  background: #0f3460;
  color: #eee;
  border: 2px solid transparent;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.choice-btn:hover:not(:disabled) {
  background: #1a4a7a;
  border-color: #e94560;
}

.choice-btn.correct {
  background: #1b5e20;
  border-color: #4caf50;
}

.choice-btn.wrong {
  background: #6e1a1a;
  border-color: #e53935;
}

.choice-btn:disabled {
  cursor: default;
  opacity: 0.85;
}

.explanation {
  background: #0f3460;
  border-left: 4px solid #e94560;
  border-radius: 0 8px 8px 0;
  padding: 16px;
  margin-top: 16px;
  font-size: 0.92rem;
  line-height: 1.6;
  color: #ccc;
  display: none;
}

.explanation.show { display: block; }

.next-btn {
  display: none;
  width: 100%;
  margin-top: 20px;
  padding: 14px;
  background: #e94560;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.next-btn:hover { background: #c73650; }
.next-btn.show { display: block; }

.score {
  text-align: center;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: #a0a0b0;
}

@media (max-width: 500px) {
  .mode-buttons { flex-direction: column; }
  .quiz-container { padding: 20px; }
}