:root {
  --bg-color: #0b0c0e;
  --panel-bg: rgba(28, 28, 30, 0.75);
  --panel-border: rgba(255, 255, 255, 0.08);
  --ink-color: #f5f5f7;
  --muted-color: #8e8e93;
  --accent-color: #0071e3;
  --accent-soft: rgba(0, 113, 227, 0.15);
  --danger-color: #ff453a;
  --danger-soft: rgba(255, 69, 58, 0.15);
  --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
  --bento-bg: rgba(44, 44, 46, 0.4);
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --cover-grad: linear-gradient(135deg, #3a1c1a 0%, #1a2a3a 100%);
  --slider-track-color: rgba(255, 255, 255, 0.18);
  --library-bg: rgba(28, 28, 30, 0.4);
  --library-item-hover: rgba(255, 255, 255, 0.04);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #f5f5f7;
    --panel-bg: rgba(255, 255, 255, 0.75);
    --panel-border: rgba(0, 0, 0, 0.08);
    --ink-color: #1d1d1f;
    --muted-color: #86868b;
    --accent-color: #0071e3;
    --accent-soft: rgba(0, 113, 227, 0.1);
    --danger-color: #ff3b30;
    --danger-soft: rgba(255, 59, 48, 0.1);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.05);
    --bento-bg: rgba(230, 230, 235, 0.5);
    --cover-grad: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    --slider-track-color: rgba(0, 0, 0, 0.1);
    --library-bg: rgba(255, 255, 255, 0.4);
    --library-item-hover: rgba(0, 0, 0, 0.02);
  }
}

/* 基础样式重置 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--ink-color);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

button, input, select {
  font-family: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

/* App 布局架壳 */
.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  min-height: 100vh;
}

.player-pane {
  padding: max(32px, env(safe-area-inset-top)) 48px max(32px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

/* 顶部栏 */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 36px;
  gap: 20px;
}

.eyebrow {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-color);
  margin-bottom: 6px;
}

h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 模拟考场药丸按钮 */
.exam-btn {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-color);
  box-shadow: var(--card-shadow);
  transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.exam-btn:hover {
  transform: translateY(-1px);
  background: var(--bento-bg);
}

.exam-btn:active {
  transform: scale(0.96);
}

.exam-dot {
  width: 6px;
  height: 6px;
  background: var(--muted-color);
  border-radius: 999px;
  display: inline-block;
}

.exam-btn.is-active {
  background: var(--danger-color);
  color: white;
  border-color: transparent;
  box-shadow: 0 0 16px rgba(255, 69, 58, 0.4);
}

.exam-btn.is-active .exam-dot {
  background: white;
  animation: pulse-dot 1.2s infinite;
}

@keyframes pulse-dot {
  0% { opacity: 0.3; }
  50% { opacity: 1; }
  100% { opacity: 0.3; }
}

.sync-status {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  color: var(--muted-color);
  box-shadow: var(--card-shadow);
  text-align: center;
}

.sync-status.is-dirty {
  background: #f59e0b20;
  color: #fbbf24;
  border-color: #f59e0b40;
}

.sync-status.is-saved {
  background: #10b98120;
  color: #34d399;
  border-color: #10b98140;
}

.sync-status.is-error {
  background: #ef444420;
  color: #f87171;
  border-color: #ef444440;
}

/* 苹果风毛玻璃卡片 */
.glass-card {
  background: var(--panel-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  box-shadow: var(--card-shadow);
  padding: 24px;
  margin-bottom: 24px;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.glass-card:hover {
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.15);
}

/* 1. 唱片艺术封面卡片 */
.cover-card {
  display: flex;
  gap: 28px;
  align-items: center;
}

.cover-art-container {
  width: 140px;
  height: 140px;
  border-radius: 16px;
  background: var(--cover-grad);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  flex-shrink: 0;
  transition: transform 0.4s ease;
}

.cover-card:hover .cover-art-container {
  transform: scale(1.03) rotate(-1deg);
}

.cover-year-watermark {
  font-size: 3.8rem;
  font-weight: 900;
  color: var(--ink-color);
  opacity: 0.08;
  letter-spacing: -0.05em;
  user-select: none;
  z-index: 1;
}

.cover-disk {
  position: absolute;
  width: 80%;
  height: 80%;
  border-radius: 999px;
  border: 1px dashed rgba(255, 255, 255, 0.05);
  opacity: 0.5;
}

.track-info {
  min-width: 0;
}

.track-info h2 {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}

.track-meta {
  font-size: 0.95rem;
  color: var(--muted-color);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 2. 自定义进度滑块卡片 */
.progress-card {
  padding: 24px 28px;
}

.custom-slider-container {
  padding: 10px 0;
}

.custom-slider {
  position: relative;
  height: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
}

.slider-track {
  position: absolute;
  left: 0;
  right: 0;
  height: 5px;
  border-radius: 999px;
  background-color: var(--slider-track-color);
  transition: height 0.15s ease;
}

.slider-fill {
  position: absolute;
  left: 0;
  height: 5px;
  border-radius: 999px;
  background-color: var(--accent-color);
  width: 0%;
  transition: height 0.15s ease;
}

.slider-thumb {
  position: absolute;
  width: 14px;
  height: 14px;
  background-color: #ffffff;
  border-radius: 999px;
  left: 0%;
  margin-left: -7px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.15s ease, transform 0.15s ease, left 0.05s linear;
  z-index: 6;
}

/* 悬停与拖拽状态进度条变粗，显示滑块游标 */
.custom-slider:hover .slider-track,
.custom-slider.dragging .slider-track {
  height: 7px;
}

.custom-slider:hover .slider-fill,
.custom-slider.dragging .slider-fill {
  height: 7px;
}

.custom-slider:hover .slider-thumb,
.custom-slider.dragging .slider-thumb {
  opacity: 1;
  transform: scale(1);
}

/* AB 标记在进度条上的定位 */
.ab-marker-a, .ab-marker-b {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  margin-left: -5px;
  z-index: 5;
  box-shadow: 0 0 6px rgba(0,0,0,0.3);
}

.ab-marker-a {
  background-color: #0071e3;
  border: 2px solid white;
}

.ab-marker-b {
  background-color: #ff453a;
  border: 2px solid white;
}

.time-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted-color);
  margin-top: 4px;
  user-select: none;
}

/* 3. SVG 播放控制卡片 */
.controls-card {
  padding: 16px 24px;
}

.transport-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
}

.control-btn {
  position: relative;
  width: 46px;
  height: 46px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-color);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.control-btn:hover {
  background: var(--bento-bg);
  color: var(--accent-color);
}

.control-btn:active {
  transform: scale(0.9);
}

.control-btn svg {
  width: 22px;
  height: 22px;
}

.btn-subtext {
  position: absolute;
  bottom: 3px;
  font-size: 0.58rem;
  font-weight: 700;
  opacity: 0.85;
}

/* 巨大圆形播放主按钮 */
.play-btn {
  width: 64px;
  height: 64px;
  border-radius: 999px;
  background-color: var(--ink-color);
  color: var(--bg-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.play-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.play-btn:active {
  transform: scale(0.95);
}

.play-btn svg {
  width: 28px;
  height: 28px;
}

.play-btn svg.icon-play {
  margin-left: 3px; /* 三角形视觉微调居中 */
}

/* 倍速药丸选择框 */
.speed-pill {
  background: var(--bento-bg);
  border: 1px solid var(--panel-border);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  cursor: pointer;
  height: 38px;
  transition: background 0.15s ease;
}

.speed-pill:hover {
  background: var(--panel-border);
}

.speed-pill select {
  cursor: pointer;
  border: none;
  background: transparent;
  padding-right: 4px;
  font-weight: 700;
}

/* 4. AB 复读卡片 */
.ab-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-eyebrow {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-color);
}

.ab-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bento-bg);
  color: var(--muted-color);
  border: 1px solid var(--panel-border);
}

.ab-btn-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.ab-btn {
  min-height: 44px;
  border-radius: 12px;
  background: var(--bento-bg);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.ab-btn:hover:not(:disabled) {
  background: var(--panel-border);
  color: var(--accent-color);
  border-color: var(--panel-border);
}

.ab-btn:active:not(:disabled) {
  transform: scale(0.96);
}

.ab-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.ab-clear-btn:hover:not(:disabled) {
  color: var(--danger-color);
}

/* 5. Bento 统计卡片网格 */
.bento-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.bento-card {
  padding: 20px;
  margin-bottom: 0;
  display: flex;
  gap: 16px;
  align-items: center;
  background: var(--panel-bg);
}

.bento-icon {
  font-size: 1.8rem;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bento-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.bento-content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.bento-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.bento-value {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bento-sublabel {
  font-size: 0.75rem;
  color: var(--muted-color);
  margin-top: 2px;
}

/* 跨两栏的掌握度卡片 */
.mastery-bento {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 14px;
  padding: 22px;
}

.mastery-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.mastery-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-color);
}

.mastery-inputs {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px;
  gap: 16px;
  align-items: center;
}

.slider-wrapper {
  padding: 8px 0;
}

#mastery {
  width: 100%;
  accent-color: var(--accent-color);
  cursor: pointer;
  height: 6px;
  border-radius: 999px;
}

#mastery-number {
  height: 38px;
  border-radius: 10px;
  background: var(--bento-bg);
  border: 1px solid var(--panel-border);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 700;
}

/* 6. 答案小组件卡片 */
.answer-card {
  position: relative;
  overflow: hidden;
}

.answer-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
}

.answer-header h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.answer-sub {
  font-size: 0.82rem;
  color: var(--muted-color);
}

.answer-clear-btn {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--bento-bg);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.answer-clear-btn:hover:not(:disabled) {
  background: var(--panel-border);
  color: var(--danger-color);
}

.answer-clear-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.answer-status {
  font-size: 0.88rem;
  color: var(--muted-color);
}

.answer-groups {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

.answer-group h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--muted-color);
  margin-bottom: 8px;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 10px;
}

.answer-cell {
  background: var(--bento-bg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative; /* 为右上角错题标记提供定位基准 */
}

/* 错题激活高亮 */
.answer-cell.is-incorrect-question {
  border-color: rgba(255, 69, 58, 0.4) !important;
  background: rgba(255, 69, 58, 0.06) !important;
}

.answer-cell.is-incorrect-question:hover {
  border-color: rgb(255, 69, 58) !important;
  background: rgba(255, 69, 58, 0.12) !important;
}

.answer-cell.is-incorrect-question .answer-question {
  color: rgb(255, 69, 58) !important;
}

.answer-cell.is-incorrect-question .answer-choice {
  color: rgb(255, 69, 58) !important;
}

.answer-cell:hover {
  transform: translateY(-2px);
  background: var(--panel-border);
  border-color: var(--accent-color);
}

.answer-cell:active {
  transform: scale(0.94);
}

.answer-question {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

.answer-choice {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent-color);
  filter: blur(8px);
  transform: scale(0.9);
  transition: filter 0.25s ease, transform 0.25s ease;
}

.answer-cell.is-revealed .answer-choice {
  filter: none;
  transform: none;
}

.answer-ocr {
  max-height: 200px;
  overflow-y: auto;
  background: var(--bento-bg);
  border-radius: 12px;
  padding: 14px;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted-color);
  margin-top: 14px;
  white-space: pre-wrap;
}

/* 答案锁屏挡板 */
.exam-shield {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(11, 12, 14, 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
}

@media (prefers-color-scheme: light) {
  .exam-shield {
    background: rgba(245, 245, 247, 0.95);
  }
}

.exam-shield span {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--danger-color);
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--danger-soft);
  border: 1px solid rgba(255, 69, 58, 0.2);
}

/* 右侧侧边栏列表 */
.library-pane {
  background-color: var(--library-bg);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border-left: 1px solid var(--panel-border);
  padding: max(32px, env(safe-area-inset-top)) 24px max(32px, env(safe-area-inset-bottom));
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}

.library-header {
  margin-bottom: 24px;
}

.library-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.library-count {
  font-size: 0.85rem;
  color: var(--muted-color);
  font-weight: 600;
}

/* 库分组与音频项 */
.year-group {
  margin-bottom: 28px;
}

.year-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--muted-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  padding: 0 4px;
}

.year-summary {
  font-size: 0.78rem;
  color: var(--accent-color);
}

.year-bar {
  display: none; /* 废弃老旧生硬的进度条，使界面清爽 */
}

.year-track-list {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.track-button {
  width: 100%;
  padding: 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  text-align: left;
  border-bottom: 1px solid var(--panel-border);
  cursor: pointer;
  transition: background 0.15s ease;
  position: relative;
}

.track-button:last-child {
  border-bottom: none;
}

.track-button:hover {
  background-color: var(--library-item-hover);
}

.track-button.is-active {
  background-color: var(--accent-soft);
  color: var(--accent-color);
}

.track-button.is-active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 4px;
  background-color: var(--accent-color);
  border-radius: 0 4px 4px 0;
}

.track-button-title {
  font-size: 0.95rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-button-mastery {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--muted-color);
}

.track-button.is-active .track-button-mastery {
  color: var(--accent-color);
}

.track-button-meta {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--muted-color);
}

.track-button.is-active .track-button-meta {
  color: rgba(0, 113, 227, 0.7);
}

.mini-bar {
  flex-grow: 1;
  max-width: 80px;
  height: 3px;
  background: var(--slider-track-color);
  border-radius: 999px;
  overflow: hidden;
  margin-right: 12px;
  display: inline-block;
}

.mini-bar span {
  display: block;
  height: 100%;
  background: var(--accent-color);
  width: 0%;
}

.track-button-details {
  white-space: nowrap;
}

/* 考场模式沉浸主题 */
body.is-exam-mode {
  --bg-color: #060505;
  --panel-bg: rgba(24, 20, 20, 0.82);
  --panel-border: rgba(255, 69, 58, 0.08);
  --ink-color: #f7eded;
  --muted-color: #9a8888;
  --accent-color: #ff453a;
  --accent-soft: rgba(255, 69, 58, 0.12);
  --bento-bg: rgba(38, 28, 28, 0.4);
  --card-shadow: 0 8px 32px 0 rgba(255, 69, 58, 0.04);
}

/* 考场模式限制（排除右上角的切换按钮） */
body.is-exam-mode .now-playing button:not(#exam-toggle),
body.is-exam-mode .now-playing select,
body.is-exam-mode .now-playing input,
body.is-exam-mode .library-pane button {
  pointer-events: none !important;
  opacity: 0.35 !important;
  cursor: not-allowed !important;
}

body.is-exam-mode .custom-slider {
  pointer-events: none !important;
}

.is-hidden {
  display: none !important;
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .app-shell {
    display: block;
  }
  
  .player-pane {
    padding: max(24px, env(safe-area-inset-top)) 24px 28px;
  }
  
  .library-pane {
    max-height: none;
    border-left: none;
    border-top: 1px solid var(--panel-border);
    padding: 28px 24px max(32px, env(safe-area-inset-bottom));
  }
}

@media (max-width: 580px) {
  h1 {
    font-size: 1.8rem;
  }
  
  .cover-card {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
  
  .cover-art-container {
    width: 120px;
    height: 120px;
  }
  
  .bento-stats-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================
   EJU 听力特训极致细节微交互与锁定系统
   ========================================== */

/* 1. 已吃透掌握勋章 */
.mastery-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: #34c759;
  background: rgba(52, 199, 89, 0.12);
  border: 1px solid rgba(52, 199, 89, 0.2);
  padding: 2px 8px;
  border-radius: 6px;
  margin-top: 4px;
  align-self: flex-start;
  animation: badge-bounce 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes badge-bounce {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.15); }
  75% { transform: scale(0.9); }
  100% { transform: scale(1); opacity: 1; }
}

/* 掌握度 100% 变绿高光 */
.mastery-bento.is-mastered-card {
  border-color: rgba(52, 199, 89, 0.45) !important;
  box-shadow: 0 0 20px rgba(52, 199, 89, 0.15) !important;
}

.mastery-bento.is-mastered-card .mastery-value {
  color: #34c759 !important;
  text-shadow: 0 0 12px rgba(52, 199, 89, 0.45);
}

/* 2. 毛玻璃答案加载骨架屏 */
.answer-skeleton {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 14px;
}

.skeleton-title {
  width: 35%;
  height: 14px;
  border-radius: 4px;
  background: var(--slider-track-color);
  animation: skeleton-pulse 1.4s infinite ease-in-out;
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
  gap: 10px;
}

.skeleton-box {
  height: 62px;
  border-radius: 12px;
  background: var(--slider-track-color);
  animation: skeleton-pulse 1.4s infinite ease-in-out;
}

/* 模拟骨架屏交错呼吸闪烁 */
.skeleton-box:nth-child(2) { animation-delay: 0.15s; }
.skeleton-box:nth-child(3) { animation-delay: 0.3s; }
.skeleton-box:nth-child(4) { animation-delay: 0.45s; }

@keyframes skeleton-pulse {
  0% { opacity: 0.3; }
  50% { opacity: 0.65; }
  100% { opacity: 0.3; }
}

/* 3. AB 控制激活状态高亮 */
.ab-btn.ab-btn-active-a {
  background: var(--accent-soft) !important;
  color: var(--accent-color) !important;
  border-color: rgba(0, 113, 227, 0.4) !important;
  box-shadow: 0 0 8px rgba(0, 113, 227, 0.2);
}

.ab-btn.ab-btn-active-b {
  background: var(--danger-soft) !important;
  color: var(--danger-color) !important;
  border-color: rgba(255, 69, 58, 0.4) !important;
  box-shadow: 0 0 8px rgba(255, 69, 58, 0.2);
}

/* 4. 物理级组件交互锁定 */
.component-locked {
  pointer-events: none !important;
  opacity: 0.35 !important;
  filter: grayscale(0.5);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* ==========================================
   EJU 听力错题本红标系统样式
   ========================================== */

/* 封面卡片内的标题控制行 */
.title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
  width: 100%;
}

.title-row h2 {
  margin-bottom: 0 !important;
}

/* 错题标记药丸按钮 */
.incorrect-toggle-btn {
  background: var(--bento-bg);
  border: 1px solid var(--panel-border);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--muted-color);
  transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
  white-space: nowrap;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.incorrect-toggle-btn:hover:not(:disabled) {
  background: var(--panel-border);
  color: var(--ink-color);
}

.incorrect-toggle-btn:active:not(:disabled) {
  transform: scale(0.95);
}

/* 错题激活态（亮红发光药丸） */
.incorrect-toggle-btn.is-incorrect {
  background: var(--danger-soft) !important;
  color: var(--danger-color) !important;
  border-color: rgba(255, 69, 58, 0.3) !important;
  box-shadow: 0 0 12px rgba(255, 69, 58, 0.2) !important;
}

.incorrect-toggle-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* 曲库错题红行高亮（永久变红） */
.track-button.is-incorrect-track {
  background-color: rgba(255, 69, 58, 0.04) !important;
}

.track-button.is-incorrect-track::after {
  background-color: rgba(255, 69, 58, 0.15) !important; /* 调整错题底下的边线 */
}

/* 错题左侧强力红边框指示线 */
.track-button.is-incorrect-track::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 4px;
  background-color: var(--danger-color) !important;
  border-radius: 0 4px 4px 0;
}

.track-button.is-incorrect-track .track-button-title {
  color: var(--danger-color) !important;
  font-weight: 800;
}

.track-button.is-incorrect-track .track-button-mastery {
  color: var(--danger-color) !important;
}

.track-button.is-incorrect-track .track-button-meta {
  color: rgba(255, 69, 58, 0.7) !important;
}

.track-button.is-incorrect-track .mini-bar span {
  background-color: var(--danger-color) !important;
}

/* 错题行悬停时加深红色底色 */
.track-button.is-incorrect-track:hover {
  background-color: rgba(255, 69, 58, 0.08) !important;
}