body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f4f7f6;
  margin: 0;
  padding: 0;
  text-align: center;
  padding-bottom: 100px;
}

:root {
  --primary: #4A90E2;
  --success: #6BCB77;
  --error: #FF6B6B;
  --warning: #FFD93D;
  --bg: #f8f9fa;
  --text: #212529;
  --card-bg: #ffffff;
  --border: #dee2e6;
  --shadow: rgba(0,0,0,0.1);
}

.dark-mode {
  --bg: #1a1a1a;
  --text: #e9ecef;
  --card-bg: #2d2d2d;
  --border: #495057;
  --shadow: rgba(0,0,0,0.3);
  background-color: var(--bg);
  color: var(--text);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding: 2rem;
}

.container {
  max-width: 800px;
  margin: 0 auto;
}

.card {
  position: relative;
  background: var(--card-bg);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 8px 32px var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
  animation: fadeIn 0.5s ease;
}

h1, h2 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  letter-spacing: -0.05em;
}

#questionSearchGroup {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 300px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow);
  overflow: hidden;
  transform-origin: top right;
  z-index: 1;
}

#questionSearchContent {
  max-height: 0;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.2s ease, padding 0.3s ease;
}

#questionSearchGroup.active {
  box-shadow: 0 8px 24px var(--shadow);
}

#questionSearchGroup.active #questionSearchContent {
  max-height: 500px;
  opacity: 1;
  padding: 1rem;
}

.search-toggle {
  cursor: pointer;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(74, 144, 226, 0.05);
  transition: background 0.2s;
}

.search-toggle:hover {
  background: rgba(74, 144, 226, 0.1);
}

#searchResults {
  max-height: 300px;
  overflow-y: auto;
  margin-top: 1rem;
}

.search-result-item {
  padding: 0.8rem;
  border-radius: 8px;
  margin: 0.2rem 0;
  background: rgba(74, 144, 226, 0.05);
  transition: all 0.2s;
  cursor: pointer;
}

.search-result-item:hover {
  background: rgba(74, 144, 226, 0.1);
  transform: translateX(4px);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: var(--primary);
  color: white;
  transition: all 0.2s;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300%;
  height: 300%;
  background: rgba(255,255,255,0.15);
  transform: translate(-50%, -50%) rotate(45deg);
  transition: all 0.5s;
  opacity: 0;
}

.btn:hover:not(.disabled)::after {
  opacity: 1;
  width: 100%;
  height: 100%;
}

.btn:hover:not(.disabled) {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.game-input {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 1.1rem;
  background: var(--card-bg);
  color: var(--text);
  margin: 1.5rem 0;
  transition: all 0.3s;
}

.game-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
  outline: none;
}

.feedback {
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1rem 0;
  display: flex;
  align-items: center;
  gap: 1rem;
  animation: slideIn 0.5s ease;
  border-left: 4px solid transparent;
}

.feedback.correct {
  background: linear-gradient(145deg, rgba(107,203,119,0.15), rgba(107,203,119,0.25));
  border-color: var(--success);
}

.feedback.error {
  background: linear-gradient(145deg, rgba(255,107,107,0.15), rgba(255,107,107,0.25));
  border-color: var(--error);
}

.feedback.info {
  background: linear-gradient(145deg, rgba(77,136,255,0.15), rgba(77,136,255,0.25));
  border-color: var(--primary);
}

.feedback::before {
  content: "💡";
  font-size: 1.5rem;
}

.feedback.error::before {
  content: "❗";
}

.feedback.correct::before {
  content: "✅";
}

.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.progress-bar {
  height: 8px;
  background: rgba(74, 144, 226, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin: 1rem 0;
}

.progress {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s ease;
}

.setting-group {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(74, 144, 226, 0.05);
}

.info-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  font-weight: bold;
  font-size: 1.1rem;
  color: var(--primary);
}

.rotate-icon {
  display: inline-block;
  transition: transform 0.5s ease;
}

#pauseOverlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 9999;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  #questionSearchGroup {
    position: static;
    width: 100%;
    margin-bottom: 1rem;
  }

  .card {
    padding: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .btn {
    width: 100%;
    padding: 1rem;
    font-size: 0.95rem;
  }

  .game-input {
    font-size: 1rem;
    padding: 0.8rem;
  }

  .info-panel {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .card {
    padding: 1rem;
  }

  h1, h2 {
    font-size: 1.5rem;
  }

  #questionSearchGroup {
    border-radius: 8px;
  }

  .search-toggle {
    padding: 0.8rem;
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(20px); }
}
  /* 黑暗模式樣式 */
.dark-mode {
    background-color: #121212; /* 深灰色背景 */
    color: #F0F0F0; /* 柔和的淺灰色文字 */
  }
  /* 黑暗模式下為頂部導航添加背景色 */
  .dark-mode .topnav {
      background-color: #222222; /* 稍淺的深灰色導航欄背景 */
    }
    
    .dark-mode .topnav a {
      color: #F0F0F0; /* 導航連結文字顏色 */
    }
    
    .dark-mode .topnav a:hover {
      background-color: #555555; /* 導航連結 hover 背景色 */
      color: #ffffff; /* 導航連結 hover 文字顏色 */
    }
    
    .dark-mode .topnav a.active {
      background-color: #5A67D8; /* Active 狀態的強調色 (柔和藍紫色) */
      color: white;
    }
    
    .dark-mode button {
      background-color: #5A67D8; /* 柔和的藍紫色按鈕背景 */
      color: #FFFFFF; /* 按鈕文字顏色 */
    }
    
    .dark-mode button:hover {
      opacity: 0.8; /* 按鈕 hover 透明度 */
    }
    
    .dark-mode .copyBtn {
      background-color: #374151; /* 深藍灰色複製按鈕背景 */
      color: #E5E7EB; /* 複製按鈕文字顏色 */
    }
    
    .dark-mode .copyBtn:hover {
      background-color: #4B5563; /* 複製按鈕 hover 背景色 */
    }
    
    .dark-mode h2 {
      color: #F0F0F0; /* 暗黑模式下標題顏色 */
    }
    
    /* 為頂部導航添加黑色背景色 */
    .topnav {
      background-color: #333;
      overflow: hidden;
      width: 100%; /* 確保寬度為 100% */
      margin: 0; /* 移除任何外邊距 */
      padding: 0; /* 移除內邊距 */
    }
      
      /* 設定導覽列中連結的樣式 */
      .topnav a {
        float: left;
        display: block;
        color: #f2f2f2;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
        font-size: 17px;
      }
      
      /* 更改懸停時連結的顏色 */
      .topnav a:hover {
        background-color: #ddd;
        color: black;
      }
      
      /* 新增一個活動類別來突出顯示目前頁面 */
      .topnav a.active {
        background-color: #04AA6D;
        color: white;
      }
      
      /* 隱藏應在小屏幕上打開和關閉頂部導航的鏈接 */
      .topnav .icon {
        display: none;
      }
      
      @media screen and (max-width: 600px) {
        .topnav a:not(:first-child) {display: none;}
        .topnav a.icon {
          float: right;
          display: block;
        }
      }
      
      @media screen and (max-width: 600px) {
        .topnav.responsive {position: relative;}
        .topnav.responsive .icon {
          position: absolute;
          right: 0;
          top: 0;
        }
        .topnav.responsive a {
          float: none;
          display: block;
          text-align: left;
        }
      }
    
      button {
        background-color: #04AA6D;
        color: white;
        padding: 14px 20px;
        margin: 8px 0;
        border: none;
        border-radius: 4px;
        cursor: pointer;
        width: 50%;
        font-size: 16px;
    }
    
    
    button:hover {
        opacity: 0.8;
    }
    
    footer {
      background-color: #222;
      font-size: 14px;
      color: white;
      text-align: center;
      padding: 5px;
      /*position: fixed; /* 固定位置 */
      left: 0;       /* 左邊緣對齊 */
      bottom: 0;     /* 底部對齊 */
      width: 100%;   /* 撐滿整個頁面的寬度 */
    }
    
    
    #date5 {
        position: fixed;
        top: 50px;
        right: 5px;
        font-size: 1.2rem;
        background: rgba(0, 0, 0, 0.8);
        color: #fff;
        padding: 5px 10px;
        border-radius: 5px;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        z-index: 2;
    }
    @media (max-width: 600px) {
        #date5 {
            top: 50px;
            font-size: 0.8rem;
        }
    }
    
    #clock5 {
        position: fixed;
        top: 85px;
        right: 5px;
        font-size: 1.2rem;
        background: rgba(0, 0, 0, 0.8);
        color: #fff;
        padding: 5px 10px;
        border-radius: 5px;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        z-index: 2;
    }
    @media (max-width: 600px) {
        #clock5 {
            top: 75px;
            font-size: 0.8rem;
        }
    }
    
    h2 {
      text-align: center; /* 水平置中 */
      color: #333;
    }
    
    /* 預設情況下隱藏手機內容 */
    .mobile-content {
      display: none;
    }
    
    /* 當螢幕寬度小於768px時，顯示手機內容，隱藏桌面內容 */
    @media (max-width: 600px) {
      .desktop-content {
          display: none;
      }
    
      .mobile-content {
          display: block;
      }
    }
    
    /* 切換開關容器 */
    .toggle-container {
      position: fixed;   /* 固定定位，會依照視窗位置 */
      top: 120px;         /* 距離上方 90px */
      right: 15px;          /* 靠右顯示 */
      display: inline-block;
      width: 60px;
      height: 34px;
      cursor: pointer;
      z-index: 2;
    }
    @media (max-width: 600px) {
      .toggle-container {
        top: 100px; 
      }
      }
    
    /* 隱藏真正的 checkbox */
    .toggle-container input {
      opacity: 0;
      width: 0;
      height: 0;
    }
    
    /* Slider 外框 */
    .slider {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: #ccc;
      transition: background-color 0.4s;
      border-radius: 34px;
    }
    
    /* Slider 上的小圓球 */
    .slider:before {
      position: absolute;
      content: "";
      height: 26px;
      width: 26px;
      left: 4px;
      bottom: 4px;
      background-color: #fff;
      transition: transform 0.4s;
      border-radius: 50%;
    }
    
    /* 當 checkbox 被勾選時改變背景顏色 */
    input:checked + .slider {
      background-color: #4d4d4d;
    }
    
    /* 當勾選時移動小圓球 */
    input:checked + .slider:before {
      transform: translateX(26px);
    }
    
    /* 太陽與月亮圖示樣式 */
    .slider .icon {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 20px;
      height: 20px;
      fill: #f39c12;
      transition: opacity 0.4s;
    }
    
    /* 太陽圖示置左 */
    .slider .icon.sun {
      left: 6px;
      opacity: 1;
    }
    
    /* 勾選時隱藏太陽圖示 */
    input:checked + .slider .icon.sun {
      opacity: 0;
    }
    
    /* 月亮圖示置右 */
    .slider .icon.moon {
      right: 6px;
      opacity: 0;
      fill: #f1c40f;
    }
    
    /* 勾選時顯示月亮圖示 */
    input:checked + .slider .icon.moon {
      opacity: 1;
    }
  
 /* 題型選擇容器 */
#typeSelectionContainer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem; /* 從 1rem 減小到 0.5rem，減少題型間的間距 */
}

/* 當題型未選中時禁用樣式 */
.type-item.disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* 響應式調整 */
@media (max-width: 768px) {
  .type-item {
    padding: 0.6rem; /* 在手機上進一步減小到 0.6rem */
  }
  .direction-group {
    margin-left: 1rem; /* 在手機上從 1.5rem 減小到 1rem */
    gap: 0.2rem; /* 進一步縮減間距 */
  }
}

/* 手風琴容器 */
#accordionContainer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 手風琴項目 */
.accordion-item {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: rgba(74, 144, 226, 0.05);
  overflow: hidden;
}

/* 手風琴標題 */
.accordion-header {
  padding: 0.8rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  background: rgba(74, 144, 226, 0.1);
  transition: background 0.2s;
}

.accordion-header:hover {
  background: rgba(74, 144, 226, 0.15);
}

.accordion-header::after {
  content: '▼';
  font-size: 0.8rem;
  transition: transform 0.3s;
}

.accordion-header.active::after {
  transform: rotate(180deg);
}

/* 手風琴內容 */
.accordion-content {
  max-height: 0;
  opacity: 0;
  padding: 0 0.8rem;
  transition: max-height 0.3s ease, opacity 0.2s ease, padding 0.3s ease;
  overflow: hidden;
}

.accordion-content.active {
  max-height: none; /* 動態高度 */
  opacity: 1;
  padding: 0.8rem;
}

/* 每個題型項目 */
.type-item {
  padding: 0.6rem 0; /* 進一步縮減內邊距 */
  border-bottom: 1px solid rgba(74, 144, 226, 0.1); /* 使用底線分隔 */
}

.type-item:last-child {
  border-bottom: none;
}

/* 題型標題 */
.type-item label.type-label {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

/* 翻譯方向子容器 */
.direction-group {
  margin-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

@media (min-width: 480px) {
  .accordion-header {
    padding: 0.5rem;
    font-size: 0.9rem;
  }
  .accordion-content.active {
    padding: 0.5rem;
  }
  .direction-group {
    flex-direction: row;
    gap: 1rem;
  }
}

/* 響應式調整 */
@media (max-width: 768px) {
  .accordion-header {
    padding: 0.6rem;
    font-size: 0.95rem;
  }
  .accordion-content.active {
    padding: 0.6rem;
  }
  .card {
    padding: 1rem;
    overflow: visible;
  }
  .type-item {
    padding: 0.4rem 0;
  }
  .direction-group {
    margin-left: 1rem;
    gap: 0.2rem;
  }
}

#generalTypeSelection,
#detailedSettingsContainer {
  transition: opacity 0.3s ease, height 0.3s ease;
}

#detailedSettingsToggle {
  cursor: pointer;
  background: rgba(74, 144, 226, 0.05);
  padding: 0.5rem;
  border-radius: 6px;
}

#detailedSettingsToggle:hover {
  background: rgba(74, 144, 226, 0.1);
}

/* 加載 Overlay */
#loadingOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 10000;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loading-content {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 8px 32px var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.loading-content p {
  margin: 0;
  font-size: 1.2rem;
  color: var(--text);
}

/* 自訂加載動畫 */
.loader {
  position: relative;
  width: 2.5em;
  height: 2.5em;
  transform: rotate(165deg);
}

.loader:before, .loader:after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 0.5em;
  height: 0.5em;
  border-radius: 0.25em;
  transform: translate(-50%, -50%);
}

.loader:before {
  animation: before8 2s infinite;
}

.loader:after {
  animation: after6 2s infinite;
}

@keyframes before8 {
  0% {
    width: 0.5em;
    box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
  }
  35% {
    width: 2.5em;
    box-shadow: 0 -0.5em rgba(225, 20, 98, 0.75), 0 0.5em rgba(111, 202, 220, 0.75);
  }
  70% {
    width: 0.5em;
    box-shadow: -1em -0.5em rgba(225, 20, 98, 0.75), 1em 0.5em rgba(111, 202, 220, 0.75);
  }
  100% {
    box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
  }
}

@keyframes after6 {
  0% {
    height: 0.5em;
    box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
  }
  35% {
    height: 2.5em;
    box-shadow: 0.5em 0 rgba(61, 184, 143, 0.75), -0.5em 0 rgba(233, 169, 32, 0.75);
  }
  70% {
    height: 0.5em;
    box-shadow: 0.5em -1em rgba(61, 184, 143, 0.75), -0.5em 1em rgba(233, 169, 32, 0.75);
  }
  100% {
    box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
  }
}

/* 確保 loader 居中 */
.loader {
  position: relative;
  margin: 0 auto;
}