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

:root {
  --bg1: #fff7ed;
  --bg2: #ffe4e6;
  --primary: #ff7a59;
  --primary-dark: #e85d3f;
  --secondary: #7c3aed;
  --success: #22c55e;
  --text: #222;
  --white: #ffffff;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
  --radius: 18px;
}

body {
  font-family: Arial, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  color: var(--text);
}

.container {
  width: 100%;
  max-width: 860px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.header {
  text-align: center;
  margin-bottom: 20px;
}

.header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
  color: var(--primary-dark);
}

.subtitle {
  font-size: 1rem;
  color: #555;
}

.rules {
  background: #fff4e6;
  border-left: 5px solid var(--primary);
  padding: 16px;
  border-radius: 12px;
  margin-bottom: 20px;
}

.rules h2 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--primary-dark);
}

.rules p {
  line-height: 1.5;
  color: #444;
}

.info {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.info-box {
  background: #f8fafc;
  border: 2px solid #e5e7eb;
  border-radius: 14px;
  padding: 14px;
  text-align: center;
}

.label {
  display: block;
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 6px;
}

.info-box span:last-child {
  font-size: 1.3rem;
  font-weight: bold;
  color: var(--secondary);
}

.actions {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

button {
  border: none;
  background: var(--primary);
  color: var(--white);
  padding: 12px 24px;
  font-size: 1rem;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
}

button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.game-section {
  display: flex;
  justify-content: center;
}

.game-board {
  display: grid;
  grid-template-columns: repeat(4, 110px);
  gap: 14px;
  justify-content: center;
}

.card {
  width: 110px;
  height: 110px;
  border-radius: 16px;
  background: linear-gradient(135deg, #ff9966, #ff5e62);
  color: var(--white);
  font-size: 2.2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  user-select: none;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  transition: transform 0.25s, background 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: scale(1.06);
}

.card.flipped {
  background: var(--white);
  color: var(--text);
  border: 2px solid var(--primary);
  transform: rotateY(180deg);
}

.card.matched {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: var(--white);
  cursor: default;
  transform: scale(1.02);
}

.message {
  text-align: center;
  margin-top: 24px;
  font-size: 1.15rem;
  font-weight: bold;
  min-height: 28px;
  color: var(--primary-dark);
}

.footer {
  margin-top: 24px;
  text-align: center;
  color: #666;
  font-size: 0.95rem;
}

@media (max-width: 700px) {
  .info {
    grid-template-columns: repeat(2, 1fr);
  }

  .game-board {
    grid-template-columns: repeat(4, 75px);
    gap: 10px;
  }

  .card {
    width: 75px;
    height: 75px;
    font-size: 1.6rem;
    border-radius: 12px;
  }

  .header h1 {
    font-size: 1.8rem;
  }
}

@media (max-width: 420px) {
  .container {
    padding: 18px;
  }

  .game-board {
    grid-template-columns: repeat(4, 65px);
    gap: 8px;
  }

  .card {
    width: 65px;
    height: 65px;
    font-size: 1.35rem;
  }
}