body {
  font-family: "Arial", sans-serif;
  background-image:url(background.jpg);
  margin: 0;
  padding: 0;
  text-align: center;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  font-size: 3em;
  margin-bottom: 20px;
  color: #fafafa;
}

#game-area {
  margin: 30px 0;
  padding: 20px;
  background-color: #fff;
  border: 2px solid #ccc;
  border-radius: 10px;
  min-height: 200px;
}

#field {
  min-width: 600px;     /* ← 横幅を確保！ */
  min-height: 220px;    /* ← 縦も必要なら一緒に */
  display: flex;
  flex-direction: column;
  align-items: center;
}

#field img {
  margin: 4px 4px; /* フィールド上の7の縦並びに上下の余白 */
}

#rules {
  text-align: left;
  margin-top: 30px;
  background-color: #fafafa;
  padding: 15px;
  border-radius: 10px;
  border: 1px solid #ddd;
}

#game-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.vertical-7s {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
#turn-display {
  font-size: 1.2em;
  font-weight: bold;
  margin: 10px;
  color: #333;
}

#player-hand {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
  gap: 6px;
  max-width: 480px;
  margin: 0 auto;
  justify-items: start;
}

.card-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

#cpu-hands {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.cpu-row {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: 12px;
  color: #333;
}

.cpu-row img {
  width: 30px;
}