body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: white;
  min-height: 100vh;
}

.app {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
  color: #60a5fa;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.controls {
  background: rgba(30, 41, 59, 0.8);
  border-radius: 12px;
  padding: 20px;
  margin-top: 20px;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.control-group {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.control-group:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 14px;
}

/* 音库选择包装器 - 适配随机按钮 */
.voice-select-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 随机音色按钮样式 - 匹配整体风格 */
.random-voice-btn {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid #475569;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  color: white;
  font-weight: 500;
  transition: all 0.2s;
  min-width: auto;
  font-size: 13px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.random-voice-btn.active {
  background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
  border-color: #16a34a;
  color: white;
}

.random-voice-btn:hover {
  background: linear-gradient(135deg, #273449 0%, #1e293b 100%);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  border-color: #60a5fa;
}

.random-voice-btn.active:hover {
  background: linear-gradient(135deg, #15803d 0%, #14532d 100%);
  border-color: #15803d;
}

input[type="number"] {
  width: 80px;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid #475569;
  background: #1e293b;
  color: white;
}

select {
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid #475569;
  background: #1e293b;
  color: white;
  min-width: 100px;
}

button {
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: white;
  font-weight: 500;
  transition: all 0.2s;
  min-width: 100px;
}

button:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

button:active {
  transform: translateY(0);
}

.card-info {
  text-align: center;
  margin-bottom: 10px;
  font-size: 14px;
  opacity: 0.8;
}

.card {
  background: linear-gradient(135deg, #020617 0%, #0f172a 100%);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 20px;
}

.arabic {
  font-size: 64px;
  margin-bottom: 15px;
  font-family: Arial, sans-serif;
  color: #fbbf24;
  text-shadow: 0 2px 8px rgba(251, 191, 36, 0.3);
  line-height: 1.2;
}

.ipa {
  font-size: 24px;
  opacity: .9;
  margin-bottom: 15px;
  color: #93c5fd;
}

.cn {
  font-size: 24px;
  margin-top: 15px;
  color: #86efac;
}

.en {
  font-size: 20px;
  opacity: .85;
  margin-top: 10px;
  color: #c4b5fd;
}

.meta {
  margin-top: 20px;
  font-size: 14px;
  opacity: .6;
  color: #94a3b8;
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: #3b82f6;
}

/* 主控制区域布局 */
.main-controls {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 20px;
  /* 限制主控制区宽度，和卡片/按钮组对齐 */
  max-width: 800px;
  width: 100%;
  margin: 20px auto 0; /* 水平居中 */
  box-sizing: border-box;
}

/* 按钮组样式 - 按钮根据内容自适应，不拉伸 */
.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  background: rgba(30, 41, 59, 0.8);
  border-radius: 12px;
  padding: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  max-width: 800px; 
  width: 100%;
  margin: 0 auto; /* 水平居中，避免贴边 */
  box-sizing: border-box; /* 防止padding撑宽容器 */
}

.button-group button {
  flex: 0 0 auto; /* 不拉伸，根据内容自适应 */
  min-width: 80px;
  padding: 8px 12px;
  font-size: 13px;
  white-space: nowrap; /* 防止文字换行 */
  box-sizing: border-box;
}

/* 移除控制面板按钮的特殊样式 - 让它和其他按钮完全一样 */
.button-group .collapse-toggle {
  /* 移除所有特殊样式，继承.button-group button的样式 */
}

/* 折叠控制面板容器 */
.controls-collapsible {
  width: 100%;
}

/* 可折叠的控制面板按钮 - 这个样式只影响控制面板的折叠按钮 */
.controls-collapsible .collapse-toggle {
  width: 100%;
  text-align: left;
  padding: 12px 20px;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  border-radius: 12px;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  justify-content: flex-start; /* 改为左对齐，而不是space-between */
  font-size: 16px;
  font-weight: 500;
  color: white;
  border: none;
  cursor: pointer;
}

.controls-collapsible .collapse-toggle:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.collapse-icon {
  display: inline-block;
  transition: transform 0.3s ease;
  font-size: 12px;
  margin-right: 8px; /* 减少间距 */
}

/* 专门针对可折叠控制面板的样式 */
.controls-collapsible .controls {
  background: rgba(30, 41, 59, 0.8);
  border-radius: 12px;
  padding: 20px;
  margin-top: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  overflow: hidden;
  transition: all 0.3s ease;
  max-height: 1000px;
  opacity: 1;
}

/* 单词列表弹窗样式 */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
}

.modal-content {
  background-color: #0f172a;
  margin: 5% auto;
  padding: 20px;
  border-radius: 15px;
  width: 90%;
  max-width: 1000px;
  max-height: 80vh;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  position: relative; /* 为关闭按钮提供定位上下文 */
}

.close-btn {
  color: #94a3b8;
  position: sticky;
  top: 10px;
  right: 10px;
  float: right;
  font-size: 32px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.2s;
  z-index: 1001;
  background: rgba(15, 23, 42, 0.9);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  margin-left: auto; /* 确保在右侧 */
}

.close-btn:hover {
  color: #fbbf24;
  background: rgba(15, 23, 42, 1);
  transform: scale(1.1);
}

.modal-content h2 {
  color: #60a5fa;
  margin-top: 0;
  margin-bottom: 20px;
  text-align: center;
}

.word-list-container {
  width: 100%;
  overflow-x: auto;
}

.word-list-table {
  width: 100%;
  border-collapse: collapse;
  background-color: #1e293b;
  border-radius: 10px;
  overflow: hidden;
}

.word-list-table th {
  background-color: #0f172a;
  color: #60a5fa;
  padding: 12px 15px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid #334155;
}

.word-list-table td {
  padding: 10px 15px;
  color: white;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.word-list-table tr:hover {
  background-color: rgba(96, 165, 250, 0.1);
}

.arabic-cell {
  font-size: 18px;
  color: #fbbf24;
  font-family: Arial, sans-serif;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .app {
    padding: 15px;
  }
  
  .arabic {
    font-size: 48px;
  }
  
  .control-group {
    gap: 10px;
  }
  
  button {
    padding: 8px 12px;
    min-width: auto;
  }
  
  /* 移动端按钮组改为两行布局 - 按钮不拉伸 */
  .button-group {
    flex-wrap: wrap; /* 允许换行 */
    gap: 8px;
    max-width: 100%; /* 移动端占满父容器（已被.main-controls限制） */
    padding: 8px;
  }
  
  .button-group button {
    flex: 0 0 calc(50% - 8px); /* 不拉伸，固定宽度 */
    min-width: 100px;
    margin-bottom: 8px;
    font-size: 12px;
    padding: 6px 8px;
    box-sizing: border-box; /* 确保padding包含在宽度内 */
  }
  
   /* 移动端控制面板按钮也和其他按钮一样布局 */
  .button-group .collapse-toggle {
    flex: 0 0 calc(50% - 8px); /* 和其他按钮一样，不拉伸 */
    min-width: 100px;
    /* 移除特殊样式，继承普通按钮样式 */
  } 
  
  .random-voice-btn {
    padding: 4px 8px;
    font-size: 12px;
    height: 28px;
  }
  
  select, input[type="number"] {
    min-width: auto;
    flex: 1;
  }
  
  .controls-collapsible .collapse-toggle {
    padding: 10px 15px;
    font-size: 14px;
  }
  
  .voice-select-wrapper {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .modal-content {
    width: 95%;
    margin: 10% auto;
    padding: 15px;
  }
  
  .word-list-table th,
  .word-list-table td {
    padding: 8px 10px;
    font-size: 14px;
  }
  
  .arabic-cell {
    font-size: 16px;
  }
}