/* --- Root & Theme Colors --- */
:root {
  --primary-light: #2575fc;
  --primary-dark: #6a11cb;
  --bg-light: #f9f9f9;
  --bg-dark: #121212;
  --text-light: #fff;
  --text-dark: #222;
  --card-light: #fff;
  --card-dark: #1e1e1e;
}

/* --- Body & Container --- */
body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: var(--bg-light);
  color: var(--text-dark);
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 1000px;
  margin: auto;
  padding: 20px;
}

/* --- Header --- */
.header {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary-light));
  color: var(--text-light);
  padding: 15px;
  text-align: center;
}

.header nav a {
  color: var(--text-light);
  margin: 0 10px;
  text-decoration: none;
}

.header nav a.active {
  text-decoration: underline;
}

/* --- Quiz / Game Box --- */
.quiz-box {
  background: var(--card-light);
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  text-align: center;
  margin-top: 20px;
  transition: background 0.3s, color 0.3s;
}

button {
  padding: 10px 15px;
  margin: 5px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s;
}

button:hover {
  transform: scale(1.05);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.next {
  background: var(--primary-light);
  color: var(--text-light);
}

/* --- Game Selector --- */
.game-selector {
  text-align: center;
  margin-bottom: 40px;
}

.game-selector h3 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--text-dark);
}

.game-cards {
  display: flex;
  justify-content: center;
  gap: 25px;
  flex-wrap: wrap;
}

.game-card {
  background: linear-gradient(145deg, var(--primary-dark), var(--primary-light));
  color: var(--text-light);
  padding: 30px 20px;
  width: 220px;
  border-radius: 20px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
  text-align: center;
}

.game-card:hover {
  transform: translateY(-10px) scale(1.05);
  box-shadow: 0 15px 30px rgba(0,0,0,0.3);
  background: linear-gradient(145deg, var(--primary-light), var(--primary-dark));
}

.game-card .icon {
  font-size: 3rem;
  margin-bottom: 15px;
  animation: float 2s infinite ease-in-out;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* --- Memory Board --- */
.memory-board {
  display: grid;
  grid-template-columns: repeat(4, 80px);
  gap: 10px;
  justify-content: center;
  margin-top: 15px;
}

.memory-card {
  width: 80px;
  height: 80px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--text-light);
  cursor: pointer;
  user-select: none;
  transition: background 0.3s, transform 0.3s;
}

.memory-card.flipped {
  background: var(--primary-dark);
  transform: scale(1.1);
}

/* --- Dark Mode Support --- */
body.dark-mode {
  background: var(--bg-dark);
  color: var(--text-light);
}

body.dark-mode .quiz-box {
  background: var(--card-dark);
  color: var(--text-light);
}

body.dark-mode button.next {
  background: var(--primary-dark);
  color: var(--text-light);
}

body.dark-mode .game-card {
  background: linear-gradient(145deg, var(--primary-light), var(--primary-dark));
  color: var(--text-light);
}

body.dark-mode .game-card:hover {
  background: linear-gradient(145deg, var(--primary-dark), var(--primary-light));
}