/* ============================================================================
 * Deutsch Copy — 德语单词抄写工具 应用样式
 * 基于 BR-Theme 主题变量，扩展应用特有组件
 * ============================================================================ */

/* --------------------------------------------------------------------------
 * Layout — 页面整体布局
 * -------------------------------------------------------------------------- */
.br-theme .app-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

/* --------------------------------------------------------------------------
 * Top Bar — 顶部固定进度区（sticky，紧凑）
 * -------------------------------------------------------------------------- */
.app-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--br-bg-page);
  padding: 8px 16px 6px;
  border-bottom: 1px solid var(--br-border);
  max-width: 100%;
  overflow-x: hidden;
}

/* 第一行：等级徽章 + 进度文本 + 进度条 + 百分比 + 跳转按钮 */
.app-progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-level-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--br-accent);
  color: #fff;
  letter-spacing: 0.5px;
  font-family: var(--br-font-sans);
  line-height: 1.4;
  flex-shrink: 0;
}

.app-progress-text {
  font-size: 11px;
  color: var(--br-ink-muted);
  white-space: nowrap;
  min-width: 42px;
  flex-shrink: 0;
}

.app-progress-bar {
  flex: 1;
  min-width: 40px;
  height: 4px;
  background: var(--br-border);
  border-radius: 10px;
  overflow: hidden;
}

.app-progress-fill {
  height: 100%;
  background: var(--br-accent);
  border-radius: 10px;
  transition: width 0.3s ease;
}

.app-progress-pct {
  font-size: 11px;
  font-weight: 600;
  color: var(--br-accent);
  min-width: 30px;
  text-align: right;
  flex-shrink: 0;
}

/* 顶部跳转按钮 — 紧凑、accent 风格 */
.app-jump-btn {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  border: none;
  border-radius: var(--br-radius-sm);
  background: var(--br-accent);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  font-family: var(--br-font-sans);
  letter-spacing: 0.3px;
  transition: background 0.15s;
}

.app-jump-btn:hover {
  background: var(--br-accent-light);
}

/* --------------------------------------------------------------------------
 * Level Tabs — A1-C2 等级切换
 * -------------------------------------------------------------------------- */
.app-levels {
  display: flex;
  gap: 5px;
  margin-top: 6px;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.app-levels::-webkit-scrollbar {
  display: none;
}

.app-level-btn {
  flex: 1;
  min-width: 38px;
  padding: 4px 2px;
  font-size: 11px;
  font-weight: 600;
  text-align: center;
  border: 1px solid var(--br-border);
  border-radius: 6px;
  background: var(--br-bg-card);
  color: var(--br-ink-light);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--br-font-sans);
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.app-level-btn:hover {
  border-color: var(--br-accent-light);
  color: var(--br-accent);
}

.app-level-btn.active {
  background: var(--br-accent);
  color: #fff;
  border-color: var(--br-accent);
}

/* --------------------------------------------------------------------------
 * Category Tags — 分类筛选（仅显示，不改变学习队列）
 * -------------------------------------------------------------------------- */
.app-categories {
  display: flex;
  gap: 5px;
  margin-top: 5px;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.app-categories::-webkit-scrollbar {
  display: none;
}

.app-cat-tag {
  font-size: 10.5px;
  padding: 2px 9px;
  border-radius: 20px;
  background: var(--br-tag-bg);
  color: var(--br-accent-light);
  font-weight: 500;
  border: 1px solid rgba(194, 81, 59, 0.12);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--br-font-sans);
  white-space: nowrap;
  flex-shrink: 0;
}

.app-cat-tag:hover {
  background: #fde8e0;
}

.app-cat-tag.active {
  background: var(--br-accent);
  color: #fff;
  border-color: var(--br-accent);
}

/* --------------------------------------------------------------------------
 * Word Card — 单词卡片
 * -------------------------------------------------------------------------- */
.app-word-card {
  scroll-margin-top: 120px;
  background: var(--br-bg-card);
  border-radius: var(--br-radius);
  padding: 16px 18px;
  margin-bottom: 14px;
  box-shadow: var(--br-shadow);
  border-left: 4px solid var(--br-accent-light);
  transition: box-shadow 0.2s;
}

.app-word-card:first-child {
  margin-top: 8px;
}

.app-word-card:hover {
  box-shadow: var(--br-shadow-hover);
}

/* Card header: index + id + category tag */
.app-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 6px;
}

.app-card-index {
  font-size: 11px;
  color: var(--br-ink-muted);
  letter-spacing: 0.5px;
}

/* Line 1: German word + Chinese meaning (same row) */
.app-word-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.app-word-german {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--br-accent);
  line-height: 1.2;
}

.app-word-chinese {
  font-size: 15px;
  color: var(--br-ink-light);
  line-height: 1.4;
  white-space: nowrap;
}

/* Word play button — inline on the right of word row */
.app-word-play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  font-size: 13px;
  border-radius: 50%;
  background: var(--br-bg-stripe);
  border: 1px solid var(--br-border);
  color: var(--br-ink-light);
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
  margin-left: auto;
}

.app-word-play-btn:hover {
  border-color: var(--br-accent-light);
  color: var(--br-accent);
  background: #fef9f7;
}

/* Line 2: German example + inline play button */
.app-example-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}

.app-example-de {
  font-size: 14px;
  color: var(--br-ink);
  font-style: italic;
  line-height: 1.5;
  flex: 1;
  min-width: 0;
}

.app-example-play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  font-size: 13px;
  border-radius: 50%;
  background: var(--br-bg-stripe);
  border: 1px solid var(--br-border);
  color: var(--br-ink-light);
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
  font-family: var(--br-font-sans);
  line-height: 1;
}

.app-example-play-btn:hover {
  border-color: var(--br-accent-light);
  color: var(--br-accent);
  background: #fef9f7;
}

/* Line 3: Chinese translation */
.app-example-zh-row {
  margin-bottom: 6px;
}

.app-example-zh {
  font-size: 12.5px;
  color: var(--br-ink-muted);
  line-height: 1.5;
}

/* Word meta — 词性、复数等（small, muted） */
.app-word-meta {
  font-size: 10.5px;
  color: var(--br-ink-muted);
  margin-bottom: 8px;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
 * Card Actions — 操作区：单词播放 + 输入框 + 抄写按钮 + Next 按钮
 * -------------------------------------------------------------------------- */
.app-card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

/* Audio buttons in action area */
.app-audio-btn {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 11px;
  padding: 5px 10px;
  border-radius: 20px;
  background: var(--br-bg-stripe);
  border: 1px solid var(--br-border);
  color: var(--br-ink-light);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--br-font-sans);
  white-space: nowrap;
  flex-shrink: 0;
}

.app-audio-btn:hover {
  border-color: var(--br-accent-light);
  color: var(--br-accent);
  background: #fef9f7;
}

/* Audio playing state */
.app-audio-btn.audio-active,
.app-example-play-btn.audio-active,
.app-word-play-btn.audio-active,
.app-copy-btn.audio-active {
  border-color: var(--br-accent);
  color: var(--br-accent);
  background: #fef5f2;
  animation: audio-pulse 1.2s ease-in-out infinite;
}

@keyframes audio-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(194, 81, 59, 0.25); }
  50%      { box-shadow: 0 0 0 6px rgba(194, 81, 59, 0); }
}

/* Copy input — single line, mobile-optimized */
.app-copy-input {
  flex: 1;
  min-width: 100px;
  padding: 7px 10px;
  font-size: 14px;
  border: 1px solid var(--br-border);
  border-radius: var(--br-radius-sm);
  background: var(--br-bg-card);
  color: var(--br-ink);
  font-family: var(--br-font-sans);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-user-select: text;
  user-select: text;
}

.app-copy-input:focus {
  border-color: var(--br-accent-light);
  box-shadow: 0 0 0 3px rgba(194, 81, 59, 0.1);
}

.app-copy-input.completed {
  border-color: var(--br-positive);
  background: #f6f9f6;
  color: var(--br-positive);
}

/* Copy button */
.app-copy-btn {
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: var(--br-radius-sm);
  background: var(--br-accent);
  color: #fff;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
  font-family: var(--br-font-sans);
  letter-spacing: 0.3px;
}

.app-copy-btn:hover {
  background: var(--br-accent-light);
}

/* Completed — only button changes color */
.app-copy-btn.completed {
  background: var(--br-positive);
  color: #fff;
}

.app-copy-btn.completed:hover {
  background: #4a7a5e;
}

/* Card flash — 跳转时的短暂高亮 */
.app-word-card.flash {
  animation: card-flash 0.7s ease;
}

@keyframes card-flash {
  0%   { box-shadow: 0 0 0 0 rgba(194, 81, 59, 0.45); }
  40%  { box-shadow: 0 0 0 12px rgba(194, 81, 59, 0.08); }
  100% { box-shadow: var(--br-shadow); }
}

/* Copy error hint — 轻量内联提示 */
.app-copy-hint {
  display: none;
  width: 100%;
  font-size: 10.5px;
  color: var(--br-negative);
  margin-top: 2px;
  line-height: 1.3;
}

.app-copy-hint.visible {
  display: block;
}

/* --------------------------------------------------------------------------
 * Action Bar — 底部操作栏（仅保留重置按钮）
 * -------------------------------------------------------------------------- */
.app-action-bar {
  display: flex;
  gap: 8px;
  margin: 20px 0;
  flex-wrap: wrap;
}

.app-action-btn {
  flex: 1;
  min-width: 120px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--br-border);
  border-radius: var(--br-radius-sm);
  background: var(--br-bg-card);
  color: var(--br-ink);
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
  font-family: var(--br-font-sans);
}

.app-action-btn:hover {
  border-color: var(--br-accent-light);
  color: var(--br-accent);
}

/* --------------------------------------------------------------------------
 * Empty State
 * -------------------------------------------------------------------------- */
.app-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--br-ink-muted);
}

.app-empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.3;
}

.app-empty h3 {
  font-family: var(--br-font-serif);
  font-size: 20px;
  color: var(--br-ink);
  margin-bottom: 6px;
}

/* --------------------------------------------------------------------------
 * Modal — 庆祝弹窗
 * -------------------------------------------------------------------------- */
.app-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.app-modal-overlay.visible {
  display: flex;
}

.app-modal {
  background: var(--br-bg-card);
  border-radius: var(--br-radius);
  padding: 40px 32px;
  text-align: center;
  max-width: 380px;
  width: 90%;
  box-shadow: var(--br-shadow-hover);
}

.app-modal h2 {
  font-family: var(--br-font-serif);
  font-size: 28px;
  font-weight: 900;
  color: var(--br-ink);
  margin: 0 0 8px;
  padding: 0;
  border: none;
}

.app-modal p {
  color: var(--br-ink-light);
  margin-bottom: 20px;
}

.app-modal-btn {
  padding: 10px 32px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--br-radius-sm);
  background: var(--br-accent);
  color: #fff;
  cursor: pointer;
  font-family: var(--br-font-sans);
}

.app-modal-btn:hover {
  background: var(--br-accent-light);
}

/* --------------------------------------------------------------------------
 * Certificate — 证书区（预留）
 * -------------------------------------------------------------------------- */
.app-certificate {
  display: none;
  background: var(--br-bg-card);
  border-radius: var(--br-radius);
  padding: 40px 32px;
  margin: 30px 0;
  text-align: center;
  box-shadow: var(--br-shadow);
  border: 2px solid var(--br-accent-light);
}

.app-certificate.visible {
  display: block;
}

.app-certificate h2 {
  font-family: var(--br-font-serif);
  font-size: 28px;
  font-weight: 900;
  color: var(--br-accent);
  margin: 0 0 8px;
  padding: 0;
  border: none;
}

/* Certificate download buttons */
.cert-download-btn {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: var(--br-radius-sm);
  background: var(--br-accent);
  color: #fff;
  cursor: pointer;
  font-family: var(--br-font-sans);
  transition: background 0.15s;
}

.cert-download-btn:hover {
  background: var(--br-accent-light);
}

.cert-download-btn.secondary {
  background: var(--br-bg-card);
  color: var(--br-ink);
  border: 1px solid var(--br-border);
}

.cert-download-btn.secondary:hover {
  border-color: var(--br-accent-light);
  color: var(--br-accent);
}

/* --------------------------------------------------------------------------
 * Print — 打印证书时只显示证书区域
 * -------------------------------------------------------------------------- */
@media print {
  .app-topbar,
  .app-container > *:not(#certificate-area),
  .app-modal-overlay,
  #word-cards,
  .app-action-bar {
    display: none !important;
  }

  .app-certificate {
    display: block !important;
    border: none !important;
    box-shadow: none !important;
    padding: 20px 0 !important;
    margin: 0 !important;
  }

  .cert-download-btn {
    display: none !important;
  }

  body.br-theme {
    background: #fff !important;
  }
}

/* --------------------------------------------------------------------------
 * Responsive
 * -------------------------------------------------------------------------- */
@media (max-width: 500px) {
  .app-topbar {
    padding: 6px 10px 5px;
  }

  .app-progress-row {
    gap: 5px;
  }

  .app-level-badge {
    font-size: 11px;
    padding: 2px 6px;
  }

  .app-progress-text {
    font-size: 10px;
    min-width: 36px;
  }

  .app-progress-pct {
    font-size: 10px;
    min-width: 26px;
  }

  .app-jump-btn {
    font-size: 10px;
    padding: 3px 8px;
  }

  .app-level-btn {
    font-size: 10px;
    padding: 3px 2px;
    min-width: 32px;
  }

  .app-levels {
    gap: 4px;
    margin-top: 5px;
  }

  .app-categories {
    gap: 4px;
    margin-top: 4px;
  }

  .app-cat-tag {
    font-size: 10px;
    padding: 2px 7px;
  }

  .app-word-card {
    scroll-margin-top: 100px;
    padding: 12px 12px;
  }

  .app-word-german {
    font-size: 20px;
  }

  .app-word-chinese {
    font-size: 13px;
  }

  .app-example-de {
    font-size: 13px;
  }

  .app-card-actions {
    gap: 4px;
  }

  .app-copy-input {
    min-width: 80px;
    font-size: 16px;  /* iOS: 16px+ prevents auto-zoom */
  }

  .app-copy-btn {
    font-size: 12px;
    padding: 6px 10px;
  }

  .app-action-bar {
    flex-direction: column;
  }
}

/* --------------------------------------------------------------------------
 * PWA 安装帮助面板
 * -------------------------------------------------------------------------- */
.app-pwa-help-btn {
  font-size: 10px;
  opacity: 0.7;
}

.app-pwa-help {
  display: none;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px 16px;
}

.app-pwa-help.visible {
  display: block;
}

.app-pwa-help-inner {
  background: var(--br-bg-card);
  border: 1px solid var(--br-border);
  border-radius: var(--br-radius);
  padding: 16px 20px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--br-ink);
}

.app-pwa-help-inner h4 {
  font-family: var(--br-font-sans);
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--br-accent);
}

.app-pwa-help-inner p {
  margin: 10px 0 4px;
  font-weight: 600;
}

.app-pwa-help-inner ol {
  margin: 4px 0 12px;
  padding-left: 20px;
}

.app-pwa-help-inner ol li {
  margin-bottom: 2px;
}

.app-pwa-help-note {
  font-size: 11px !important;
  color: var(--br-ink-muted) !important;
  margin-top: 10px !important;
  font-weight: 400 !important;
}