/* LexiFlash 应用样式 */
:root {
  --primary-color: #3366FF;
  --primary-dark: #1F4CD5;
  --primary-light: #5E8AFF;
  --success-color: #4CAF50;
  --warning-color: #FFC107;
  --danger-color: #F44336;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f7;
  color: var(--gray-900);
}

/* 模拟 iPhone 外观 */
.device-container {
  width: 375px;
  height: 812px;
  background-color: white;
  border-radius: 40px;
  overflow: hidden;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  margin: 20px auto;
  border: 1px solid #ddd;
}

/* iOS 状态栏 */
.status-bar {
  height: 44px;
  background-color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--gray-200);
}

.status-bar-time {
  font-weight: 600;
  font-size: 15px;
}

.status-bar-icons {
  display: flex;
  gap: 5px;
}

/* 主内容区域 */
.app-content {
  height: calc(100% - 44px - 83px); /* 减去状态栏和底部导航的高度 */
  overflow-y: auto;
  position: relative;
}

/* 底部导航栏 */
.tab-bar {
  height: 83px;
  background-color: #fff;
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-around;
  align-items: center;
  position: absolute;
  bottom: 0;
  width: 100%;
  padding-bottom: 20px; /* 为 iPhone 底部安全区域留出空间 */
}

.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--gray-600);
  font-size: 10px;
  padding: 5px 0;
  width: 20%;
  text-decoration: none;
}

.tab-item.active {
  color: var(--primary-color);
}

.tab-icon {
  font-size: 24px;
  margin-bottom: 3px;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-outline {
  background-color: transparent;
  border: 1.5px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-block {
  width: 100%;
  margin: 10px 0;
}

/* 卡片样式 */
.card {
  background-color: white;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  margin: 15px;
}

.flashcard {
  height: 400px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  padding: 20px;
}

.flashcard-word {
  font-size: 32px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.flashcard-translation {
  font-size: 18px;
  color: var(--gray-600);
  margin-top: 20px;
}

.flashcard-example {
  font-size: 16px;
  color: var(--gray-700);
  font-style: italic;
  margin-top: 30px;
  line-height: 1.5;
}

/* 输入框样式 */
.form-group {
  margin-bottom: 20px;
}

.form-control {
  width: 100%;
  padding: 15px;
  border-radius: 12px;
  border: 1.5px solid var(--gray-300);
  font-size: 16px;
  transition: all 0.2s;
}

.form-control:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(51, 102, 255, 0.15);
}

/* 页面共享样式 */
.page-title {
  font-size: 28px;
  font-weight: 700;
  margin: 25px 20px 15px;
}

.page-subtitle {
  font-size: 16px;
  color: var(--gray-600);
  margin: 0 20px 30px;
}

/* 索引页样式 */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  padding: 20px;
}

.preview-item {
  border: 1px solid var(--gray-300);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.preview-title {
  padding: 10px;
  background-color: var(--primary-color);
  color: white;
  font-weight: 600;
  text-align: center;
}

.preview-frame {
  width: 100%;
  height: 300px;
  border: none;
}

/* 进度条样式 */
.progress-bar {
  height: 8px;
  background-color: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 4px;
}

/* 列表样式 */
.list-item {
  display: flex;
  align-items: center;
  padding: 15px 20px;
  border-bottom: 1px solid var(--gray-200);
}

.list-item-icon {
  font-size: 24px;
  margin-right: 15px;
  color: var(--primary-color);
}

.list-item-content {
  flex: 1;
}

.list-item-title {
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 4px;
}

.list-item-subtitle {
  font-size: 14px;
  color: var(--gray-600);
}

.list-item-action {
  color: var(--gray-500);
}