/* 1. 全局樣式 */
body {
    margin: 0;
    padding: 0;
    display: flex;
    min-height: 100vh;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #a1c4fd 0%, #c2e9fb 100%);
    user-select: none;
    overflow-x: hidden;
}

#gameHeader {
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 10px 0;
}

/* 2. 設定頁樣式 */
#settingsPage {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    max-width: 95%;
    width: 350px;
    margin: 20px;
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

#settingsPage h2 {
    text-align: center;
    color: #2d3748;
    font-size: 1.8rem;
    margin-bottom: 1.2rem;
}

#settingsPage div {
    margin-bottom: 0.5rem;
}

#settingsPage label {
    display: inline-block;
    width: 60px;
    color: #4a5568;
    font-weight: 500;
}

#settingsPage select {
    width: 200px;
    min-width: 150px;
    max-width: calc(100% - 80px);
    padding: 5px 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background-color: white;
    color: #2d3748;
    font-size: 1rem;
    transition: all 0.2s ease;
}

#settingsPage select:focus {
    border-color: #4299e1;
    outline: none;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}

.button-container {
    display: flex;
    width: 100%;
    gap: 10px;
    /* 讓按鈕之間有間距，可依需求調整 */
}

.button-container button {
    width: 50%;
    padding: 12px;
    font-size: 1.1rem;
    border-radius: 8px;
    border: none;
    color: white;
    transition: transform 0.2s ease;
}

#startButton:hover,
#viewButton:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(120, 120, 120, 0.2);
}

#viewButton {
    background-color: #007bff;
}

#startButton {
    background-color: #28a745;
}


#closeButton {
    position: absolute;
    top: 15px;
    left: 15px;
    z-index: 1000;
    width: 30px;
    height: 30px;
    background-color: rgba(255, 255, 255, 0.7);
    border: none;
    border-radius: 50%;
    font-size: 18px;
    color: #888;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, sans-serif;
}

#closeButton:hover {
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transform: scale(1.1);
}

#closeButton:active {
    transform: scale(0.95);
}


/* Modal buttons */
.modal-buttons {
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}
#returnButton {
  background-color: #f44336;
  color: white;
}
#continueButton {
  background-color: #4caf50;
  color: white;
}
.modal-buttons:focus {
  outline: 3px solid #007bff;
}

/* 4. 模態框樣式 */
.modal {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
}
.modal-content {
  background-color: #fefefe;
  padding: 20px;
  border: 1px solid #888;
  width: 90%;
  max-width: 250px;
  border-radius: 10px;
  text-align: center;
  position: relative;
  transform: translate(-50%, -50%);
  top: 50%;
  left: 50%;
}

/* 5. 遊戲卡片樣式 */
#gameContainer {
    background-color: rgba(255, 255, 255, 0.6);
    border-radius: 10px;
    max-width: 800px;
    width: 90%;
    min-height: 95vh;
    margin: 0px auto;
    display: flex;
    position: relative;
    padding: 0 20px;
  /* 滾動條樣式 */
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}
/* 新增：Webkit 瀏覽器的滾動條樣式 */
#gameContainer::-webkit-scrollbar {
  width: 6px;
}

#gameContainer::-webkit-scrollbar-track {
  background: transparent;
}

#gameContainer::-webkit-scrollbar-thumb {
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 3px;
}

.card {
  width: 100%;
  max-width: 180px;
  height: 100px;
  margin: 0 auto;
  perspective: 1000px;
  cursor: pointer;
  transition: transform 0.3s ease;
  font-size: 22px;
}
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}
.card.flipped .card-inner {
  transform: rotateY(180deg);
}
.card-front,
.card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  text-align: center;
  /* 添加文字換行控制 */
  word-break: keep-all;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  font-size: 20px;
  line-height: 1.4;
}
.card-front {
  background-color: #2196f3;
  color: white;
}
.card-back {
  background-color: white;
  transform: rotateY(180deg);
  border: 2px solid #2196f3;
}
.card.matched {
  animation: matchedAnimation 0.5s ease-out;
  opacity: 0.7;
}
.card.selected .card-back {
  border: 3px solid #ffd700;
  box-shadow: 0 0 6px rgba(255, 215, 0, 0.5);
}

@keyframes matchedAnimation {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

/* 6. 格子布局樣式 */
#cardGrid {
  display: grid;
  gap: 15px;
  padding: 15px;
  width: calc(100% - 30px); /* 修改：確保寬度計算包含 padding */
  max-width: 1000px;
  margin: auto;
  min-height: 70vh;
  align-content: center;
  justify-content: center;
}
#cardGrid[data-card-count="4"],
#cardGrid[data-card-count="3"],
#cardGrid[data-card-count="2"] {
  grid-template-columns: repeat(2, minmax(150px, 180px));
  max-width: 400px;
}
#cardGrid[data-card-count="8"],
#cardGrid[data-card-count="7"],
#cardGrid[data-card-count="6"],
#cardGrid[data-card-count="5"] {
  grid-template-columns: repeat(2, minmax(150px, 180px));
  max-width: 600px;
}
#cardGrid[data-card-count="9"] {
  grid-template-columns: repeat(4, minmax(150px, 180px));
  max-width: 800px;
}

/* 7. 響應式設計 */
@media screen and (max-width: 768px) {
  .card {
    width: 150px;
    height: 100px;
  }
  #cardGrid {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 8px;
    padding: 10px;
  }
}

/* 大螢幕設備 (>= 1024px) */
@media screen and (min-width: 1024px) {
  #cardGrid {
    grid-template-columns: repeat(4, 1fr);
    max-width: 1000px;
  }
}

/* 平板設備 (768px - 1023px) */
@media screen and (min-width: 768px) and (max-width: 1023px) {
  #cardGrid {
    grid-template-columns: repeat(4, 1fr);
    max-width: 800px;
  }

  .card {
    max-width: 150px;
    height: 100px;
  }
}

/* 大手機設備 (550px - 767px) 
@media screen and (min-width: 700px) and (max-width: 767px) {*/
@media screen and (max-width: 767px) {
  #cardGrid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    padding: 10px;
  }

  .card {
    max-width: 150px;
    height: 95px;
  }
}

/* 手機設備 (<= 480px) 
@media screen and (max-width: 480px) {

    .card {
        width: 130px;
        height: 85px;
    }

    #cardGrid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 6px;
        padding: 8px;
    }

    .card-front, .card-back {
        font-size: 14px;
    }
*/
}

/* 修改 gameStats 樣式，使其靠右對齊 */
#gameStats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end; /* 修改：從 center 改為 flex-end */
  margin: 0 15px 0 0; /* 新增：右側邊距 */
}

/* 確保時間顯示在右側 */
#timeDisplay {
  white-space: nowrap;
  margin-right: 15px; /* 新增：右側邊距 */
}

/* 9. 動畫效果 */
.time-warning {
  color: red;
  animation: blink 1s infinite;
}

@keyframes blink {
  50% {
    opacity: 0.3;
  }
}