/* ============================================
 * BioQuest — Anki 风格间隔重复卡片样式
 * 移动优先、3D 翻转、Anki 风格评分按钮
 * ============================================ */

/* ==================== 页面标题区域 ==================== */
.anki-page-header {
  text-align: center;
  margin-bottom: 24px;
}

.anki-page-header .section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-sage);
  margin-bottom: 8px;
}

.anki-page-header .section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-deep);
  margin-bottom: 6px;
}

.anki-page-header .section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ==================== 牌组选择器 ==================== */
#anki-deck-selector {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 4px 0;
  justify-content: center;
}

#anki-deck-selector::-webkit-scrollbar {
  display: none;
}

.anki-deck-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-light);
  background: var(--surface-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
  min-width: 100px;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.anki-deck-btn:hover {
  border-color: var(--color-sage);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.anki-deck-btn.active {
  background: var(--color-sage);
  border-color: var(--color-sage);
  color: #fff;
}

.anki-deck-btn.active .anki-deck-name {
  color: #fff;
}

.anki-deck-btn.active .anki-stat-due,
.anki-deck-btn.active .anki-stat-new,
.anki-deck-btn.active .anki-stat-total {
  color: rgba(255, 255, 255, 0.85);
}

.anki-deck-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.anki-deck-stats {
  display: flex;
  gap: 6px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
}

.anki-stat-due {
  color: var(--color-error);
  font-weight: 600;
}

.anki-stat-new {
  color: var(--color-amber);
  font-weight: 500;
}

.anki-stat-total {
  color: var(--text-muted);
}

/* ==================== 卡片学习区域 ==================== */
#anki-card-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: calc(100vh - 320px);
}

/* ==================== 卡片容器 ==================== */
.anki-card-container {
  width: 100%;
  max-width: 600px;
  perspective: 1200px;
}

.anki-card {
  width: 100%;
  min-height: calc(100vh - 360px);
  max-height: 680px;
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
}

.anki-card.anki-flipped {
  transform: rotateY(180deg);
  cursor: default;
}

/* 翻页时模拟厚度阴影 */
.anki-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  transform: translateZ(-1px);
}

.anki-card.anki-flipped::before {
  opacity: 1;
}

/* ==================== 正/背面（3D 双面）==================== */
.anki-face {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  background: var(--surface-primary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: box-shadow 0.3s ease;
}

/* 正面默认可见 */
.anki-front-face {
  z-index: 2;
  transform: rotateY(0deg);
  pointer-events: auto;
  padding: 32px 28px 28px;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* 背面默认隐藏，旋转 180deg */
.anki-back-face {
  z-index: 1;
  transform: rotateY(180deg);
  pointer-events: none;
  padding: 28px 28px 20px;
  align-items: stretch;
  justify-content: space-between;
}

/* 翻转后：背面获得指针事件 */
.anki-card.anki-flipped .anki-back-face {
  pointer-events: auto;
}

.anki-card.anki-flipped .anki-front-face {
  pointer-events: none;
}

/* ==================== 正面元素 ==================== */
.anki-card-category {
  display: inline-block;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(90, 125, 92, 0.1);
  color: var(--color-sage);
  margin-bottom: 12px;
}

.anki-card-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.anki-question-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-deep);
  line-height: 1.8;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  word-break: break-word;
}

/* "显示答案" 按钮 — 大而醒目 */
.anki-flip-btn {
  margin-top: 24px;
  padding: 16px 48px;
  border-radius: var(--radius-full);
  border: none;
  background: linear-gradient(135deg, var(--color-sage), var(--color-mid));
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.04em;
  -webkit-tap-highlight-color: transparent;
  min-height: 52px;
  box-shadow: 0 4px 16px rgba(90, 125, 92, 0.25);
}

.anki-flip-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(90, 125, 92, 0.35);
}

.anki-flip-btn:active {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 2px 8px rgba(90, 125, 92, 0.2);
}

/* 滑动提示 */
.anki-swipe-hint {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 12px;
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0.6;
}

.anki-swipe-hint svg {
  width: 16px;
  height: 16px;
  stroke: var(--text-muted);
  fill: none;
  stroke-width: 2;
  animation: swipeHintPulse 2s ease-in-out infinite;
}

@keyframes swipeHintPulse {
  0%, 100% { opacity: 0.4; transform: translateX(0); }
  50% { opacity: 1; transform: translateX(4px); }
}

/* ==================== 背面元素 ==================== */
.anki-answer-text {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-secondary);
  padding: 20px 24px;
  background: rgba(90, 125, 92, 0.05);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-sage);
  flex: 1;
  overflow-y: auto;
  word-break: break-word;
}

/* ==================== 评分按钮栏 ==================== */
.anki-rating-bar {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.anki-rate-btn {
  flex: 1;
  padding: 14px 10px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.02em;
  min-height: 48px;
  -webkit-tap-highlight-color: transparent;
}

.anki-rate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.anki-rate-btn:active {
  transform: translateY(0) scale(0.96);
}

/* 再来一次 - 红色 */
.anki-rate-again {
  background: rgba(192, 85, 58, 0.1);
  color: var(--color-error);
  border: 1.5px solid rgba(192, 85, 58, 0.2);
}
.anki-rate-again:hover {
  background: var(--color-error);
  color: #fff;
  border-color: var(--color-error);
}

/* 困难 - 灰紫色 */
.anki-rate-hard {
  background: rgba(108, 92, 125, 0.1);
  color: #6c5c7d;
  border: 1.5px solid rgba(108, 92, 125, 0.2);
}
.anki-rate-hard:hover {
  background: #6c5c7d;
  color: #fff;
  border-color: #6c5c7d;
}

/* 一般 - 琥珀色 */
.anki-rate-good {
  background: rgba(232, 168, 48, 0.1);
  color: #b8860b;
  border: 1.5px solid rgba(232, 168, 48, 0.25);
}
.anki-rate-good:hover {
  background: var(--color-warning);
  color: var(--color-deep);
  border-color: var(--color-warning);
}

/* 简单 - 绿色 */
.anki-rate-easy {
  background: rgba(58, 140, 92, 0.1);
  color: var(--color-success);
  border: 1.5px solid rgba(58, 140, 92, 0.2);
}
.anki-rate-easy:hover {
  background: var(--color-success);
  color: #fff;
  border-color: var(--color-success);
}

/* ==================== 进度条 ==================== */
#anki-progress-bar {
  max-width: 600px;
  margin: 16px auto 0;
  text-align: center;
  width: 100%;
}

.anki-progress-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  display: block;
  margin-bottom: 8px;
}

.anki-progress-text strong {
  color: var(--color-sage);
  font-weight: 700;
}

.anki-progress-track {
  width: 100%;
  height: 6px;
  background: var(--border-default);
  border-radius: 3px;
  overflow: hidden;
}

.anki-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-sage), var(--color-success));
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* ==================== 卡片入场动画 ==================== */
@keyframes ankiCardEnter {
  from {
    opacity: 0;
    transform: translateX(30px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.anki-card-enter {
  animation: ankiCardEnter 0.35s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* ==================== 学习完成界面 ==================== */
.anki-complete {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 32px;
  background: var(--surface-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  max-width: 480px;
  margin: 0 auto;
  animation: ankiCardEnter 0.45s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.anki-complete-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(58, 140, 92, 0.1);
  color: var(--color-success);
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.anki-complete-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--color-deep);
  margin-bottom: 8px;
}

.anki-complete-stats {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.anki-complete-stats strong {
  color: var(--color-sage);
  font-weight: 700;
}

.anki-complete-actions {
  display: flex;
  gap: 12px;
}

.anki-action-btn {
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: none;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 48px;
  -webkit-tap-highlight-color: transparent;
}

.anki-action-primary {
  background: linear-gradient(135deg, var(--color-sage), var(--color-mid));
  color: #fff;
}

.anki-action-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(90, 125, 92, 0.3);
}

.anki-action-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border-default);
}

.anki-action-secondary:hover {
  border-color: var(--color-sage);
  color: var(--color-sage);
}

/* ==================== 空状态 / 错误状态 ==================== */
.anki-empty,
.anki-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 32px;
  background: var(--surface-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  max-width: 480px;
  margin: 0 auto;
  min-height: 300px;
}

.anki-empty-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  opacity: 0.5;
}

.anki-empty-text {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==================== 键盘快捷键提示 ==================== */
.anki-shortcut-hint {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 14px;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.anki-shortcut-hint kbd {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--surface-tertiary);
  border: 1px solid var(--border-default);
  font-family: inherit;
  font-size: 0.7rem;
  margin-right: 3px;
}

/* ==================== 深色模式适配 ==================== */
[data-theme="dark"] .anki-card {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .anki-face {
  background: var(--surface-primary);
  border-color: var(--border-default);
}

[data-theme="dark"] .anki-question-text {
  color: var(--text-primary);
}

[data-theme="dark"] .anki-answer-text {
  background: rgba(90, 125, 92, 0.08);
}

[data-theme="dark"] .anki-rate-again {
  background: rgba(212, 101, 74, 0.12);
  border-color: rgba(212, 101, 74, 0.25);
  color: var(--color-error);
}
[data-theme="dark"] .anki-rate-again:hover {
  background: var(--color-error);
  color: #fff;
  border-color: var(--color-error);
}

[data-theme="dark"] .anki-rate-hard {
  background: rgba(130, 110, 150, 0.15);
  border-color: rgba(130, 110, 150, 0.3);
  color: #b8a8c8;
}
[data-theme="dark"] .anki-rate-hard:hover {
  background: #8a7a9a;
  color: #fff;
  border-color: #8a7a9a;
}

[data-theme="dark"] .anki-rate-good {
  background: rgba(240, 184, 64, 0.1);
  border-color: rgba(240, 184, 64, 0.25);
  color: var(--color-warning);
}
[data-theme="dark"] .anki-rate-good:hover {
  background: var(--color-warning);
  color: var(--color-deep);
  border-color: var(--color-warning);
}

[data-theme="dark"] .anki-rate-easy {
  background: rgba(74, 156, 108, 0.1);
  border-color: rgba(74, 156, 108, 0.2);
  color: var(--color-success);
}
[data-theme="dark"] .anki-rate-easy:hover {
  background: var(--color-success);
  color: #fff;
  border-color: var(--color-success);
}

[data-theme="dark"] .anki-complete {
  border-color: var(--border-default);
}

[data-theme="dark"] .anki-complete-title {
  color: var(--text-primary);
}

[data-theme="dark"] .anki-progress-track {
  background: var(--border-default);
}

[data-theme="dark"] .anki-deck-btn {
  background: var(--surface-secondary);
  border-color: var(--border-default);
}

[data-theme="dark"] .anki-deck-btn.active {
  background: var(--color-sage);
  border-color: var(--color-sage);
}

[data-theme="dark"] .anki-flip-btn {
  box-shadow: 0 4px 16px rgba(90, 125, 92, 0.15);
}

/* ==================== 移动端响应式 ==================== */

@media (max-width: 768px) {
  .anki-page-header .section-title {
    font-size: 1.6rem;
  }

  .anki-page-header {
    margin-bottom: 16px;
  }

  #anki-deck-selector {
    justify-content: flex-start;
    padding: 4px 4px;
    margin-bottom: 16px;
    gap: 8px;
  }

  .anki-deck-btn {
    padding: 8px 14px;
    min-width: 88px;
  }

  .anki-deck-name {
    font-size: 0.82rem;
  }

  .anki-deck-stats {
    font-size: 0.66rem;
  }

  .anki-card {
    min-height: calc(100vh - 280px);
  }

  .anki-front-face {
    padding: 24px 20px 20px;
  }

  .anki-back-face {
    padding: 20px 18px 16px;
  }

  .anki-question-text {
    font-size: 1.1rem;
  }

  .anki-answer-text {
    font-size: 0.92rem;
    padding: 16px 18px;
  }

  /* 评分按钮移动端纵向排列 */
  .anki-rating-bar {
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
  }

  .anki-rate-btn {
    padding: 14px 16px;
    font-size: 0.88rem;
    min-height: 48px;
  }

  .anki-flip-btn {
    padding: 16px 40px;
    font-size: 1rem;
    min-height: 52px;
    width: 100%;
    max-width: 280px;
  }

  /* 显示滑动提示 */
  .anki-swipe-hint {
    display: flex;
  }

  .anki-complete {
    padding: 40px 24px;
  }

  .anki-complete-actions {
    flex-direction: column;
    width: 100%;
  }

  .anki-action-btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .anki-page-header .section-title {
    font-size: 1.4rem;
  }

  .anki-page-header .section-desc {
    font-size: 0.88rem;
  }

  .anki-card {
    min-height: calc(100vh - 260px);
  }

  .anki-front-face {
    padding: 20px 16px 16px;
  }

  .anki-back-face {
    padding: 16px 14px 12px;
  }

  .anki-question-text {
    font-size: 1.02rem;
    line-height: 1.7;
  }

  .anki-answer-text {
    font-size: 0.88rem;
    padding: 14px 14px;
  }

  .anki-flip-btn {
    padding: 14px 32px;
    font-size: 0.95rem;
  }

  .anki-rate-btn {
    padding: 12px 14px;
    font-size: 0.84rem;
  }

  .anki-shortcut-hint {
    display: none;
  }

  .anki-card-category {
    font-size: 0.68rem;
    padding: 4px 12px;
  }
}

/* ==================== 滚动条美化（卡片内部） ==================== */
.anki-face::-webkit-scrollbar {
  width: 4px;
}

.anki-face::-webkit-scrollbar-track {
  background: transparent;
}

.anki-face::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 2px;
}

/* ==================== 减少动画偏好 ==================== */
@media (prefers-reduced-motion: reduce) {
  .anki-card {
    transition: none;
  }

  .anki-face {
    transition: none;
  }

  .anki-card-enter {
    animation: none;
  }

  .anki-complete {
    animation: none;
  }

  .anki-progress-fill {
    transition: none;
  }

  .anki-swipe-hint svg {
    animation: none;
  }
}