body {
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      /* 桌面版默认使用Grid布局 */
      display: grid;
      grid-template-columns: 50% 1fr;
      grid-template-rows: auto 1fr auto auto auto;
      grid-template-areas:
        "header header"
        "video lines"
        "mode lines"
        "controls lines"
        "audio lines";
      height: 100vh;
      background: linear-gradient(135deg, #f0f4f8 0%, #e6eef6 50%, #dde8f0 100%);
      overflow: hidden;
    }

    /* 桌面版默认隐藏移动端元素 */
    .mobile-practice-back,
    .start-recording-fab,
    .fab-record-container,
    .bottom-nav {
      display: none !important;
    }

    .back-header {
      grid-area: header;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #115e59 0%, #ea580c 50%, #f97316 100%);
      padding: 0.5rem 1.5rem;
      box-shadow: 0 2px 12px rgba(79, 70, 229, 0.2);
      z-index: 100;
      position: relative;
    }

    .back-btn {
      color: white;
      font-size: 0.85rem;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 0.4rem 0.9rem;
      background: rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      transition: all 0.2s ease;
    }

    .back-btn:hover {
      background: rgba(255, 255, 255, 0.25);
      transform: translateX(-2px);
    }

    .view-toggle {
      margin-left: auto;
      display: flex;
      gap: 8px;
    }

    .toggle-btn {
      padding: 0.5rem 0.875rem;
      border: 2px solid rgba(255, 255, 255, 0.3);
      background: transparent;
      border-radius: 8px;
      font-size: 0.85rem;
      color: white;
      cursor: pointer;
      font-weight: 500;
      transition: all 0.2s ease;
      position: relative;
      /* Ensure tooltip positioning context */
    }

    .toggle-btn:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: rgba(255, 255, 255, 0.5);
    }

    .toggle-btn.active {
      background: white;
      color: #667eea;
      border-color: white;
    }

    .practice-banner {
      display: none !important;
    }

    .mode-top-bar {
      margin: 0.75rem 1rem 0;
      padding: 0.75rem 1rem;
      background: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
      border-radius: 14px;
      border: 1px solid rgba(0, 0, 0, 0.06);
      box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .mode-top-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
    }

    .mode-top-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: #374151;
    }

    .theme-toggle {
      position: relative;
      width: 44px;
      height: 26px;
      border-radius: 999px;
      border: 1px solid rgba(148, 163, 184, 0.4);
      background: #f8fafc;
      color: #1f2937;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 6px;
      transition: all 0.2s ease;
    }

    .theme-toggle .icon-sun,
    .theme-toggle .icon-moon {
      font-size: 12px;
      opacity: 0.8;
    }

    .theme-toggle::after {
      content: '';
      position: absolute;
      top: 3px;
      left: 3px;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: #0f766e;
      transition: all 0.2s ease;
      box-shadow: 0 4px 10px rgba(99, 102, 241, 0.35);
    }

    [data-theme="dark"] .theme-toggle {
      background: rgba(30, 41, 59, 0.9);
      border-color: rgba(148, 163, 184, 0.2);
      color: #e2e8f0;
    }

    [data-theme="dark"] .theme-toggle::after {
      transform: translateX(18px);
      background: #f59e0b;
      box-shadow: 0 4px 10px rgba(245, 158, 11, 0.35);
    }

    .mode-top-hint {
      font-size: 11px;
      color: #64748b;
      background: #f8fafc;
      padding: 6px 10px;
      border-radius: 8px;
    }

    [data-theme="dark"] .mode-top-bar {
      background: rgba(15, 23, 42, 0.9);
      border-color: rgba(148, 163, 184, 0.2);
      box-shadow: 0 10px 24px rgba(15, 23, 42, 0.4);
    }

    [data-theme="dark"] .mode-top-title {
      color: #e2e8f0;
    }

    [data-theme="dark"] .mode-top-hint {
      background: rgba(30, 41, 59, 0.8);
      color: #94a3b8;
    }

    /* Practice Mode Selector Styles */
    .practice-mode-selector {
      grid-area: mode;
      margin-top: 0 !important;
      position: static;
      background: #fafbfc;
      padding: 0.75rem 1rem;
      border-right: 1px solid rgba(0, 0, 0, 0.06);
      border-bottom: 1px solid rgba(0, 0, 0, 0.06);
      z-index: 1;
    }

    .mode-selector-card .card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      padding-bottom: 8px;
      margin-bottom: 8px;
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .mode-selector-card .card-header h3 {
      font-size: 0.85rem;
      font-weight: 700;
      color: #374151;
    }

    .mode-collapse-btn {
      border: 1px solid rgba(99, 102, 241, 0.2);
      background: #f8fafc;
      color: #0f766e;
      border-radius: 999px;
      padding: 4px 10px;
      font-size: 11px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .mode-collapse-btn:hover {
      background: #eef2ff;
      border-color: rgba(99, 102, 241, 0.4);
    }

    .mode-selector-card.collapsed .mode-description,
    .mode-selector-card.collapsed .mode-quick-steps {
      display: none;
    }

    .mode-selector-card.collapsed .mode-demo-grid {
      display: none;
    }

    .mode-demo-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin: 10px 0 14px;
    }

    .mode-demo-card {
      border: 1px solid rgba(15, 23, 42, 0.08);
      border-radius: 12px;
      background: white;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      transition: all 0.2s ease;
      position: relative;
      overflow: hidden;
    }

    .mode-demo-card.active {
      border-color: #0f766e;
      box-shadow: 0 8px 20px rgba(99, 102, 241, 0.2);
    }

    .mode-demo-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
    }

    .mode-preview {
      position: absolute;
      inset: 10px;
      border-radius: 10px;
      background: rgba(15, 23, 42, 0.92);
      color: #f8fafc;
      display: grid;
      align-content: center;
      gap: 6px;
      text-align: center;
      padding: 10px;
      opacity: 0;
      transform: translateY(8px);
      transition: all 0.2s ease;
      pointer-events: none;
    }

    .mode-demo-card:hover .mode-preview {
      opacity: 1;
      transform: translateY(0);
    }

    .mode-preview .preview-title {
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.02em;
      color: #fbbf24;
    }

    .mode-preview .preview-text {
      font-size: 13px;
      font-weight: 600;
    }

    .mode-preview .preview-meta {
      font-size: 11px;
      color: rgba(248, 250, 252, 0.75);
    }

    .mode-demo-video {
      border-radius: 10px;
      min-height: 96px;
      padding: 10px;
      color: white;
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      background: linear-gradient(135deg, #111827, #1f2937);
    }

    .mode-demo-video.demo-shadowing {
      background: linear-gradient(135deg, #1e3a8a, #1e40af);
    }

    .mode-demo-video.demo-dialogue {
      background: linear-gradient(135deg, #111827, #ea580c);
    }

    .demo-state {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }

    .demo-chip {
      font-size: 10px;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.18);
      color: rgba(255, 255, 255, 0.92);
      letter-spacing: 0.02em;
      backdrop-filter: blur(4px);
    }

    .demo-chip.accent {
      background: rgba(255, 255, 255, 0.9);
      color: #1e293b;
    }

    .demo-chip.pause {
      border: 1px dashed rgba(255, 255, 255, 0.5);
      background: rgba(15, 23, 42, 0.18);
    }

    .demo-mic {
      font-size: 13px;
      padding: 3px 8px;
      border-radius: 999px;
      background: rgba(15, 23, 42, 0.35);
      box-shadow: 0 6px 18px rgba(15, 23, 42, 0.25);
      animation: micPulse 1.6s ease-in-out infinite;
    }

    .demo-track {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .demo-waveform {
      display: flex;
      align-items: flex-end;
      gap: 4px;
      height: 22px;
      margin-top: 2px;
      padding: 2px 0;
    }

    .wave-bar {
      width: 4px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.85);
      box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
      transform-origin: bottom;
      animation: waveBounce 1.2s ease-in-out infinite;
    }

    .wave-bar:nth-child(2) {
      animation-delay: 0.15s;
    }

    .wave-bar:nth-child(3) {
      animation-delay: 0.3s;
    }

    .wave-bar:nth-child(4) {
      animation-delay: 0.45s;
    }

    .wave-bar:nth-child(5) {
      animation-delay: 0.6s;
    }

    .wave-bar:nth-child(6) {
      animation-delay: 0.75s;
    }

    .wave-bar:nth-child(7) {
      animation-delay: 0.9s;
    }

    .wave-bar:nth-child(8) {
      animation-delay: 1.05s;
    }

    .wave-bar:nth-child(9) {
      animation-delay: 1.2s;
    }

    .wave-bar:nth-child(10) {
      animation-delay: 1.35s;
    }

    .wave-bar:nth-child(11) {
      animation-delay: 1.5s;
    }

    .wave-bar:nth-child(12) {
      animation-delay: 1.65s;
    }

    .demo-line {
      height: 6px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.45);
      position: relative;
      overflow: hidden;
    }

    .demo-line::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.85), transparent);
      animation: demoSweep 2.6s ease-in-out infinite;
    }

    .demo-line:nth-child(2)::after {
      animation-delay: 0.35s;
    }

    .demo-line:nth-child(3)::after {
      animation-delay: 0.7s;
    }

    .demo-progress {
      height: 6px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.18);
      position: relative;
      overflow: hidden;
    }

    .demo-dot {
      position: absolute;
      top: 50%;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.9);
      transform: translate(-10%, -50%);
      animation: demoDot 2.6s ease-in-out infinite;
      box-shadow: 0 0 10px rgba(255, 255, 255, 0.45);
    }

    .demo-bubbles {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .demo-bubble {
      align-self: flex-start;
      padding: 6px 10px;
      border-radius: 999px;
      font-size: 11px;
      background: rgba(255, 255, 255, 0.2);
      animation: bubbleFloat 2.4s ease-in-out infinite;
    }

    .demo-bubble.accent {
      align-self: flex-end;
      background: rgba(255, 255, 255, 0.85);
      color: #1f2937;
      font-weight: 700;
      animation: bubblePulse 2.2s ease-in-out infinite;
    }

    .demo-caption {
      font-size: 11px;
      color: rgba(255, 255, 255, 0.85);
    }

    .mode-demo-text {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .demo-title {
      font-size: 12px;
      font-weight: 700;
      color: #111827;
    }

    .demo-desc {
      font-size: 11px;
      color: #6b7280;
    }

    @keyframes demoSweep {
      0% {
        transform: translateX(-120%);
      }
      100% {
        transform: translateX(120%);
      }
    }

    @keyframes bubbleFloat {
      0%,
      100% {
        transform: translateY(0);
        opacity: 0.85;
      }
      50% {
        transform: translateY(-6px);
        opacity: 1;
      }
    }

    @keyframes bubblePulse {
      0%,
      100% {
        transform: scale(1);
        box-shadow: 0 0 0 rgba(255, 255, 255, 0.4);
      }
      50% {
        transform: scale(1.05);
        box-shadow: 0 0 18px rgba(255, 255, 255, 0.55);
      }
    }

    @keyframes micPulse {
      0%,
      100% {
        transform: scale(1);
        box-shadow: 0 0 0 rgba(255, 255, 255, 0.35);
      }
      50% {
        transform: scale(1.08);
        box-shadow: 0 0 14px rgba(255, 255, 255, 0.6);
      }
    }

    @keyframes demoDot {
      0% {
        left: 6%;
        opacity: 0.6;
      }
      40% {
        left: 62%;
        opacity: 1;
      }
      100% {
        left: 94%;
        opacity: 0.75;
      }
    }

    @keyframes waveBounce {
      0%,
      100% {
        height: 6px;
        opacity: 0.5;
      }
      45% {
        height: 18px;
        opacity: 1;
      }
      70% {
        height: 10px;
        opacity: 0.75;
      }
    }

    .dialogue-onboard-card {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(14, 165, 233, 0.12));
      border: 1px solid rgba(99, 102, 241, 0.25);
      border-radius: 14px;
      padding: 12px;
      margin-bottom: 12px;
    }

    .dialogue-onboard-title {
      font-size: 13px;
      font-weight: 700;
      color: #312e81;
      margin-bottom: 8px;
    }

    .dialogue-onboard-steps {
      display: grid;
      gap: 6px;
      font-size: 12px;
      color: #1f2937;
    }

    .dialogue-onboard-step {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .dialogue-onboard-step .step-dot {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: #0f766e;
      color: white;
      font-size: 11px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }


    .mode-tabs {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 8px;
      margin-bottom: 0;
    }

    .mode-tab {
      background: linear-gradient(180deg, #f9fafb 0%, #f3f4f6 100%);
      border: 2px solid rgba(0, 0, 0, 0.06);
      border-radius: 10px;
      padding: 10px 8px;
      font-size: 12px;
      font-weight: 600;
      color: #6b7280;
      cursor: pointer;
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .mode-tab:hover {
      border-color: rgba(79, 70, 229, 0.2);
      background: #f3f4f6;
    }

    .mode-tab:active {
      transform: scale(0.98);
    }

    .mode-tab.active {
      background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
      border-color: #0f766e;
      color: #115e59;
    }

    .mode-icon {
      font-size: 18px;
    }

    .mode-label {
      font-size: 11px;
      font-weight: 600;
    }

    .mode-description {
      text-align: center;
      font-size: 12px;
      color: #64748b;
      padding: 6px 10px;
      background: #f8fafc;
      border-radius: 8px;
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .mode-quick-steps {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      padding: 8px 0 4px;
    }

    .mode-quick-step {
      background: #ffffff;
      border: 1px solid rgba(0, 0, 0, 0.06);
      border-radius: 8px;
      padding: 8px 10px;
      display: grid;
      gap: 3px;
      text-align: left;
    }

    .mode-quick-step .step-title {
      font-weight: 700;
      color: #374151;
      font-size: 11px;
    }

    .mode-quick-step .step-text {
      font-size: 10px;
      color: #64748b;
      line-height: 1.4;
    }

    .mode-live-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 10px;
      padding: 10px 12px;
      margin-bottom: 12px;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      background: linear-gradient(90deg, #f8fafc 0%, #f1f5f9 100%);
    }

    .mode-live-main {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .mode-live-icon {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: #0ea5e920;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }

    .mode-live-text {
      display: grid;
      gap: 2px;
    }

    .mode-live-title {
      font-weight: 700;
      color: #0f172a;
    }

    .mode-live-subtitle {
      font-size: 13px;
      color: #475569;
    }

    .mode-live-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: flex-end;
      align-items: center;
    }

    .mode-live-tag {
      padding: 6px 10px;
      background: #0ea5e91a;
      color: #0f172a;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      font-size: 12px;
      font-weight: 600;
    }

    .start-practice-container {
      margin: 0.75rem 1rem 0;
      padding: 0;
    }

    .start-practice-btn {
      width: 100%;
      padding: 10px 16px;
      background: linear-gradient(135deg, #115e59 0%, #ea580c 50%, #f97316 100%);
      border: none;
      border-radius: 10px;
      color: white;
      font-size: 0.9rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
      transition: all 0.2s ease;
    }

    .start-practice-btn:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
    }

    .start-practice-btn:active {
      transform: scale(0.98);
    }

    .start-practice-btn .btn-icon {
      font-size: 18px;
    }

    .start-practice-btn .btn-text {
      font-size: 13px;
    }

    /* Speed Selector Styles */
    .speed-selector-group {
      margin-bottom: 12px;
    }

    .speed-selector-group label {
      display: block;
      font-size: 13px;
      color: #666;
      margin-bottom: 8px;
      font-weight: 600;
    }

    .speed-buttons {
      display: flex;
      gap: 6px;
      justify-content: space-between;
    }

    .speed-btn {
      flex: 1;
      padding: 6px 10px;
      background: #f5f5f5;
      position: relative;
      /* Ensure tooltip positioning context */
      border: 2px solid transparent;
      border-radius: 8px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #666;
      cursor: pointer;
      transition: all 0.2s ease;
    }

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

    .speed-btn.active {
      background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
      border-color: #4caf50;
      color: #2e7d32;
    }

    /* Global Recording Controls */
    .global-recording-controls {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 12px;
    }

    .global-record-btn,
    .global-stop-btn,
    .global-play-btn {
      width: 100%;
      padding: 12px 16px;
      border-radius: 10px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 2px solid;
    }

    .global-record-btn {
      background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
      border-color: #f44336;
      color: #c62828;
    }

    .global-stop-btn {
      background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
      border-color: #ff9800;
      color: #e65100;
    }

    .global-play-btn {
      background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
      border-color: #2196f3;
      color: #1976d2;
    }

    .global-record-btn:active,
    .global-stop-btn:active,
    .global-play-btn:active {
      transform: scale(0.98);
    }

    .recording-time {
      text-align: center;
      font-size: 16px;
      font-weight: 600;
      color: #f44336;
      font-family: 'Courier New', monospace;
      padding: 8px;
      background: #ffebee;
      border-radius: 8px;
    }

    .btn-icon {
      font-size: 18px;
    }

    .btn-text {
      font-size: 14px;
    }

    .video-player-container {
      grid-area: video;
      position: relative;
      width: 100%;
      height: 100%;
      background: linear-gradient(180deg, #0f0f0f 0%, #1a1a1a 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      border-right: 1px solid rgba(0, 0, 0, 0.1);
      top: auto;
      left: auto;
      right: auto;
      max-height: none;
    }

    .video-player-container video {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
      max-height: 100%;
    }

    .video-player-container::before {
      content: '';
      position: absolute;
      inset: 0;
      pointer-events: none;
      border-radius: inherit;
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08), inset 0 0 60px rgba(0, 0, 0, 0.3);
    }

    .video-player-container::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 80px;
      background: linear-gradient(transparent, rgba(0, 0, 0, 0.5));
      pointer-events: none;
    }

    .video-controls-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
      padding: 16px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .video-progress {
      width: 100%;
      height: 4px;
      background: rgba(255, 255, 255, 0.3);
      border-radius: 2px;
      cursor: pointer;
    }

    .video-progress-fill {
      height: 100%;
      background: #667eea;
      border-radius: 2px;
      width: 0%;
      transition: width 0.1s;
    }

    .video-time {
      color: white;
      font-size: 12px;
      text-align: center;
    }

    .practice-controls {
      grid-area: controls;
      margin-top: 0;
      background: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
      padding: 1.5rem 2rem;
      border-top: 1px solid #e5e7eb;
      border-right: 1px solid #e5e7eb;
      box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.04);
      border-bottom: none;
      position: relative;
      z-index: 10;
      display: none;
      /* Initially hidden until user starts practice */
    }

    .enable-practice-btn {
      width: 100%;
      background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
      border: 2px solid #2196f3;
      color: #1976d2;
      padding: 12px;
      border-radius: 10px;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 10px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .enable-practice-btn.active {
      background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
      color: white;
    }

    .practice-hint {
      font-size: 12px;
      color: #666;
      text-align: center;
      margin-bottom: 10px;
    }

    /* ========== 对话模式新样式 ========== */
    .section-title {
      font-size: 18px;
      font-weight: 700;
      color: #1e293b;
      margin: 0 0 16px 0;
    }

    .role-selection-section {
      padding: 16px;
      background: #f8fafc;
      border-radius: 14px;
      margin-bottom: 16px;
      border: 1px solid #e2e8f0;
      box-shadow: 0 8px 18px rgba(148, 163, 184, 0.15);
    }

    .role-buttons-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: 12px;
      margin-bottom: 16px;
    }

    .role-button {
      padding: 16px 12px;
      background: linear-gradient(135deg, #fff 0%, #f1f5f9 100%);
      border: 2px solid #cbd5e1;
      border-radius: 12px;
      cursor: pointer;
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: #475569;
      text-align: center;
    }

    .role-button .role-head {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .role-button .role-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 999px;
      background: rgba(245, 158, 11, 0.15);
      color: #b45309;
      border: 1px solid rgba(245, 158, 11, 0.25);
    }

    .role-button .role-name-zh {
      font-size: 15px;
      font-weight: 700;
    }

    .role-button .role-name-en {
      font-size: 12px;
      color: #64748b;
      font-weight: 500;
    }

    .role-button .role-meta {
      font-size: 11px;
      color: #94a3b8;
      font-weight: 500;
    }

    .role-button:hover {
      border-color: #3b82f6;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
    }

    .role-button.selected {
      background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
      border-color: #2563eb;
      color: white;
      box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
    }

    .role-button .role-icon {
      font-size: 24px;
    }

    .role-button .role-name {
      font-size: 14px;
      font-weight: 600;
    }

    .role-button.selected .role-name-en,
    .role-button.selected .role-meta {
      color: rgba(255, 255, 255, 0.8);
    }

    .role-hint {
      font-size: 13px;
      color: #64748b;
      text-align: center;
      margin: 0 0 12px 0;
      padding: 8px 12px;
      background: #fff;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
    }

    .role-preview-panel {
      background: white;
      border-radius: 12px;
      padding: 12px 14px;
      border: 1px solid #e2e8f0;
      display: grid;
      gap: 10px;
    }

    .role-preview-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      flex-wrap: wrap;
    }

    .role-preview-title {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      color: #1e293b;
      font-size: 14px;
    }

    .role-preview-chip {
      padding: 2px 8px;
      border-radius: 999px;
      background: rgba(59, 130, 246, 0.12);
      color: #2563eb;
      font-size: 11px;
      font-weight: 700;
    }

    .role-preview-count {
      font-size: 12px;
      color: #94a3b8;
      font-weight: 500;
    }

    .role-preview-tip {
      font-size: 12px;
      color: #f59e0b;
      font-weight: 600;
    }

    .role-preview-lines {
      display: grid;
      gap: 8px;
    }

    .role-preview-line {
      padding: 8px 10px;
      border-radius: 10px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      font-size: 13px;
      color: #334155;
    }

    .role-preview-line strong {
      color: #2563eb;
      font-weight: 600;
      margin-right: 6px;
    }

    .advanced-settings {
      margin-top: 12px;
    }

    .advanced-settings summary {
      cursor: pointer;
      font-size: 13px;
      color: #64748b;
      padding: 8px;
      border-radius: 6px;
      user-select: none;
      transition: all 0.2s;
    }

    .advanced-settings summary:hover {
      background: #fff;
    }

    .advanced-content {
      padding: 12px;
      background: #fff;
      border-radius: 8px;
      margin-top: 8px;
      border: 1px solid #e2e8f0;
    }

    .setting-row {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
      flex-wrap: wrap;
    }

    .setting-row:last-child {
      margin-bottom: 0;
    }

    .setting-row label {
      font-size: 13px;
      color: #475569;
      min-width: 60px;
    }

    .setting-row select {
      padding: 6px 10px;
      font-size: 13px;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      background: white;
    }

    .setting-btn {
      padding: 6px 12px;
      font-size: 13px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s;
    }

    .setting-btn:hover {
      background: #e2e8f0;
    }

    /* 练习进度区域 */
    .practice-progress-section {
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: 8px;
      margin-bottom: 12px;
      border: 1px solid #e2e8f0;
    }

    .progress-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 8px;
    }

    .progress-stats {
      display: flex;
      gap: 12px;
      align-items: center;
    }

    .progress-count {
      font-size: 14px;
      font-weight: 600;
      color: #475569;
      background: white;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
    }

    .progress-bar-container {
      margin-bottom: 8px;
    }

    .progress-bar {
      width: 100%;
      height: 6px;
      background: #e2e8f0;
      border-radius: 3px;
      overflow: hidden;
    }

    .progress-fill {
      height: 100%;
      background: #10b981;
      transition: width 0.3s ease;
    }

    .sentence-status-row {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
      padding: 4px 0;
    }

    .sentence-status-dot {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 10px;
      cursor: pointer;
      transition: all 0.2s;
      border: 1.5px solid transparent;
    }

    .sentence-status-dot.pending {
      background: #e2e8f0;
      color: #94a3b8;
      font-weight: 500;
    }

    .sentence-status-dot.recorded {
      background: #10b981;
      color: white;
      border-color: #10b981;
    }

    .sentence-status-dot.skipped {
      background: #f59e0b;
      color: white;
    }

    .sentence-status-dot.current {
      border-color: #3b82f6;
      transform: scale(1.1);
      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    }

    .sentence-status-dot:hover {
      transform: scale(1.1);
    }

    /* ASR文本对比区域 - 优化版 */
    .asr-comparison-section {
      padding: 28px;
      background: linear-gradient(135deg, #f8faff 0%, #ffffff 100%);
      border-radius: 20px;
      margin-bottom: 24px;
      border: 2px solid #3b82f6;
      box-shadow: 0 8px 16px -2px rgba(59, 130, 246, 0.15), 0 4px 8px -1px rgba(0, 0, 0, 0.08);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .asr-comparison-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, #3b82f6 0%, #f97316 50%, #ec4899 100%);
      animation: shimmer 3s ease-in-out infinite;
    }

    @keyframes shimmer {

      0%,
      100% {
        opacity: 1;
      }

      50% {
        opacity: 0.6;
      }
    }

    .asr-comparison-section:hover {
      box-shadow: 0 12px 24px -4px rgba(59, 130, 246, 0.2), 0 8px 16px -2px rgba(0, 0, 0, 0.1);
      transform: translateY(-2px);
    }

    .asr-title {
      font-size: 20px;
      font-weight: 700;
      color: #0f172a;
      margin: 0 0 24px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-bottom: 16px;
      border-bottom: 2px solid #e0e7ff;
      gap: 12px;
      flex-wrap: wrap;
    }

    .asr-accuracy-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      border-radius: 24px;
      font-size: 15px;
      font-weight: 700;
      background: #f1f5f9;
      color: #475569;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
      transition: all 0.2s ease;
    }

    .asr-accuracy-badge:hover {
      transform: scale(1.05);
    }

    .asr-accuracy-badge.high {
      background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
      color: #166534;
      box-shadow: 0 4px 8px rgba(22, 101, 52, 0.2);
    }

    .asr-accuracy-badge.medium {
      background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
      color: #b45309;
      box-shadow: 0 4px 8px rgba(180, 83, 9, 0.2);
    }

    .asr-accuracy-badge.low {
      background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
      color: #991b1b;
      box-shadow: 0 4px 8px rgba(153, 27, 27, 0.2);
    }

    .asr-text-container {
      margin-bottom: 24px;
      display: grid;
      gap: 20px;
    }

    .original-text,
    .asr-text {
      margin-bottom: 0;
      position: relative;
    }

    .original-text label,
    .asr-text label {
      font-size: 12px;
      font-weight: 700;
      color: #94a3b8;
      display: block;
      margin-bottom: 8px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .text-content {
      padding: 18px 22px;
      background: #ffffff;
      border-radius: 14px;
      border: 2px solid #e0e7ff;
      font-size: 17px;
      line-height: 1.7;
      min-height: 60px;
      transition: all 0.2s ease;
      color: #1e293b;
      position: relative;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
    }

    .text-content:focus-within {
      border-color: #14b8a6;
      background: white;
      box-shadow: 0 4px 8px rgba(99, 102, 241, 0.1);
    }

    .asr-text .text-content {
      background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
      border-color: #93c5fd;
      color: #1e40af;
      font-weight: 500;
    }

    .asr-text .text-content:focus-within {
      border-color: #60a5fa;
      box-shadow: 0 4px 8px rgba(59, 130, 246, 0.15);
    }

    .text-content .loading {
      color: #0ea5e9;
      font-style: italic;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .text-content .loading::after {
      content: '';
      width: 14px;
      height: 14px;
      border: 2px solid #0ea5e9;
      border-top-color: transparent;
      border-radius: 50%;
      animation: spin 1s linear infinite;
    }

    @keyframes spin {
      to {
        transform: rotate(360deg);
      }
    }

    .text-content .word {
      display: inline-block;
      padding: 3px 6px;
      border-radius: 6px;
      transition: all 0.2s ease;
      margin: 0 2px;
    }

    .text-content .word.match {
      background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
      color: #065f46;
      font-weight: 600;
      box-shadow: 0 1px 2px rgba(6, 95, 70, 0.1);
    }

    .text-content .word.match:hover {
      transform: scale(1.05);
      box-shadow: 0 2px 4px rgba(6, 95, 70, 0.2);
    }

    .text-content .word.mismatch {
      background: linear-gradient(135deg, #fecaca 0%, #fca5a5 100%);
      color: #7f1d1d;
      text-decoration: line-through;
      font-weight: 600;
      box-shadow: 0 1px 2px rgba(127, 29, 29, 0.1);
      text-decoration-color: #ef4444;
    }

    .asr-actions {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
      justify-content: stretch;
      padding-top: 24px;
      margin-top: 24px;
      border-top: 2px solid #e0e7ff;
    }

    .asr-btn {
      padding: 12px 24px;
      font-size: 15px;
      font-weight: 600;
      border: 2px solid #cbd5e1;
      border-radius: 12px;
      background: white;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
      justify-content: center;
      width: 100%;
    }

    .asr-btn:hover {
      background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
      border-color: #64748b;
      transform: translateY(-2px);
      box-shadow: 0 6px 12px -2px rgba(0, 0, 0, 0.12);
    }

    .asr-btn:active {
      transform: translateY(0);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
    }

    .asr-btn.primary {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: white;
      border: none;
      box-shadow: 0 6px 12px -2px rgba(16, 185, 129, 0.4);
      font-size: 16px;
      padding: 14px 28px;
    }

    .asr-btn.primary:hover {
      background: linear-gradient(135deg, #059669 0%, #047857 100%);
      box-shadow: 0 8px 16px -4px rgba(16, 185, 129, 0.5);
      transform: translateY(-2px) scale(1.02);
    }

    /* 音素分析样式 */
    .phoneme-analysis-section {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 0;
      margin-top: 16px;
      overflow: hidden;
    }

    .phoneme-summary {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 12px 16px;
      cursor: pointer;
      list-style: none;
      user-select: none;
      font-weight: 600;
      color: #475569;
      font-size: 14px;
      background: #f1f5f9;
      transition: background 0.2s;
    }

    .phoneme-summary:hover {
      background: #e2e8f0;
    }

    .phoneme-summary::-webkit-details-marker {
      display: none;
    }

    .phoneme-summary .icon {
      font-size: 18px;
    }

    .phoneme-summary .badge {
      margin-left: auto;
      padding: 4px 12px;
      background: white;
      color: #0369a1;
      border-radius: 12px;
      font-size: 12px;
      font-weight: 700;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    }

    .phoneme-summary .badge.has-errors {
      color: #991b1b;
      background: #fee2e2;
    }

    .phoneme-content {
      padding: 16px;
      background: white;
    }

    .phoneme-loading {
      text-align: center;
      padding: 24px;
      color: #64748b;
      font-style: italic;
    }

    .phoneme-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 16px;
    }

    .phoneme-item {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      padding: 10px 14px;
      background: white;
      border: 2px solid #d1fae5;
      border-radius: 10px;
      min-width: 64px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    }

    .phoneme-item.error {
      background: #fff1f2;
      border-color: #fecdd3;
    }

    .phoneme-symbol {
      font-size: 20px;
      font-weight: 700;
      color: #065f46;
      margin-bottom: 6px;
      font-family: monospace;
    }

    .phoneme-item.error .phoneme-symbol {
      color: #991b1b;
    }

    .phoneme-score {
      font-size: 12px;
      color: #64748b;
      font-weight: 500;
    }

    .phoneme-note {
      margin-top: 16px;
      padding: 12px 16px;
      background: #fffbeb;
      border-left: 4px solid #f59e0b;
      border-radius: 6px;
      font-size: 14px;
      color: #92400e;
      line-height: 1.5;
    }

    .phoneme-note p {
      margin: 0;
    }

    /* 完整回放按钮样式 */
    .playback-btn,
    .export-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 20px;
      background: white;
      color: #475569;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .playback-btn:hover,
    .export-btn:hover {
      background: #f8fafc;
      border-color: #cbd5e1;
      color: #1e293b;
    }

    .playback-btn .icon,
    .export-btn .icon {
      font-size: 16px;
    }

    /* 开始对话练习按钮样式 */
    .start-dialogue-btn {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 14px 32px;
      background: linear-gradient(135deg, #115e59 0%, #ea580c 50%, #f97316 100%);
      color: white;
      border: none;
      border-radius: 12px;
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.2s ease;
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
    }

    .start-dialogue-btn:hover {
      background: linear-gradient(135deg, #0f5e52 0%, #c2410c 60%, #ea580c 100%);
      box-shadow: 0 10px 18px rgba(79, 70, 229, 0.45);
      transform: translateY(-1px);
    }

    .start-dialogue-btn:active {
      transform: translateY(1px);
    }

    .start-dialogue-btn .icon {
      font-size: 22px;
    }

    /* 导出报告按钮样式 */
    .export-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 20px;
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: white;
      border: none;
      border-radius: 10px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
      box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
    }

    .export-btn:hover {
      background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
    }

    .export-btn:active {
      transform: translateY(0);
    }

    .export-btn .icon {
      font-size: 18px;
    }

    .practice-control-section {
      padding: 16px;
      background: #f8fafc;
      border-radius: 12px;
      margin-bottom: 16px;
    }

    /* Collapsible Setup Container */
    .dialogue-setup-container {
      transition: all 0.3s ease-in-out;
      overflow: hidden;
      max-height: 2000px;
      /* Arbitrary large height */
      opacity: 1;
    }

    .dialogue-setup-container.collapsed {
      max-height: 0;
      opacity: 0;
      margin: 0;
      padding: 0;
    }

    #toggle-setup-btn .icon {
      transition: transform 0.3s ease;
    }

    #toggle-setup-btn.collapsed .icon {
      transform: rotate(180deg);
    }

    .shadowing-status {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px;
      background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
      border: 2px solid #0ea5e9;
      border-radius: 10px;
      margin-bottom: 12px;
    }

    .shadowing-status .status-icon {
      font-size: 20px;
    }

    .shadowing-status .status-text {
      font-size: 15px;
      font-weight: 700;
      color: #0369a1;
    }

    .shadowing-control-buttons {
      display: flex;
      gap: 8px;
      margin-top: 12px;
    }

    .shadowing-start-btn,
    .shadowing-pause-btn {
      flex: 1;
      padding: 14px;
      border: none;
      border-radius: 10px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.2s ease;
    }

    .shadowing-start-btn {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: white;
    }

    .shadowing-start-btn:active {
      transform: scale(0.98);
    }

    .shadowing-pause-btn {
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: white;
    }

    .shadowing-pause-btn:active {
      transform: scale(0.98);
    }

    .shadowing-nav-buttons {
      display: flex;
      gap: 8px;
      margin-top: 12px;
    }

    .shadowing-replay-btn,
    .shadowing-next-btn {
      flex: 1;
      padding: 12px;
      border: none;
      border-radius: 10px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: all 0.2s ease;
    }

    .shadowing-replay-btn {
      background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
      color: white;
    }

    .shadowing-replay-btn:active {
      transform: scale(0.98);
    }

    .shadowing-next-btn {
      background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
      color: white;
    }

    .shadowing-next-btn:active {
      transform: scale(0.98);
    }

    /* 跟读模式和朗读模式下的特殊样式 */
    .shadowing-mode .practice-line-list {
      display: none;
    }

    .shadowing-mode .practice-current-line {
      display: block;
      font-size: 18px;
      line-height: 1.8;
      padding: 24px;
      text-align: center;
    }

    /* 朗读模式：仅高亮当前行 */
    .reading-mode .practice-line-list {
      display: flex !important;
    }

    .reading-mode .practice-current-line {
      display: none !important;
    }

    .reading-mode .practice-line-list .line-item {
      background: #f8fafc;
      border-left: 1px solid #e2e8f0;
      opacity: 0.95;
    }

    .reading-mode .practice-line-list .line-item.reading-active-line {
      background: #fff7e6;
      border-left: 4px solid #f59e0b;
      opacity: 1;
      box-shadow: 0 6px 16px rgba(245, 158, 11, 0.15);
    }

    .reading-mode .practice-line-list .line-item.reading-active-line .line-text {
      color: #0f172a;
      font-weight: 600;
    }

    /* 朗读模式控件样式 */
    .reading-status {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px;
      background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
      border: 2px solid #f59e0b;
      border-radius: 10px;
      margin-bottom: 12px;
    }

    .reading-status .status-icon {
      font-size: 20px;
    }

    .reading-status .status-text {
      font-size: 15px;
      font-weight: 700;
      color: #92400e;
    }

    .reading-audio-buttons {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 8px;
      margin-top: 12px;
    }

    .reading-listen-btn,
    .reading-record-btn,
    .reading-stop-btn,
    .reading-play-btn {
      padding: 12px;
      border: none;
      border-radius: 10px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: all 0.2s ease;
    }

    .reading-listen-btn {
      background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
      color: white;
    }

    .reading-record-btn {
      background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
      color: white;
    }

    .reading-stop-btn {
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: white;
    }

    .reading-play-btn {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: white;
    }

    .reading-listen-btn:active,
    .reading-record-btn:active,
    .reading-stop-btn:active,
    .reading-play-btn:active {
      transform: scale(0.98);
    }

    .reading-nav-buttons {
      display: flex;
      gap: 8px;
      margin-top: 12px;
    }

    .reading-prev-btn,
    .reading-next-btn {
      flex: 1;
      padding: 12px;
      border: none;
      border-radius: 10px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: all 0.2s ease;
      background: linear-gradient(135deg, #0f766e 0%, #115e59 100%);
      color: white;
    }

    .reading-prev-btn:active,
    .reading-next-btn:active {
      transform: scale(0.98);
    }

    .speaker-selector {
      width: 100%;
      padding: 12px;
      border: 2px solid #e0e0e0;
      border-radius: 8px;
      font-size: 15px;
      background: white;
      cursor: pointer;
    }

    .lines-container {
      grid-area: lines;
      grid-row: 3 / -1;
      /* 从第3行(video开始)到最后一行 */
      background: linear-gradient(180deg, #ffffff 0%, #f8fafc 50%, #f1f5f9 100%);
      padding: 1.5rem 2rem;
      padding-bottom: 2rem;
      overflow-y: auto;
      margin-top: 0;
      position: relative;
      z-index: 5;
      display: none;
      /* Initially hidden until user starts practice */
      scrollbar-width: thin;
      scrollbar-color: rgba(99, 102, 241, 0.3) transparent;
    }

    .lines-container::-webkit-scrollbar {
      width: 6px;
    }

    .lines-container::-webkit-scrollbar-track {
      background: transparent;
    }

    .lines-container::-webkit-scrollbar-thumb {
      background: linear-gradient(180deg, rgba(99, 102, 241, 0.3) 0%, rgba(139, 92, 246, 0.3) 100%);
      border-radius: 3px;
    }

    .lines-container::-webkit-scrollbar-thumb:hover {
      background: linear-gradient(180deg, rgba(99, 102, 241, 0.5) 0%, rgba(139, 92, 246, 0.5) 100%);
    }

    .practice-content {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      padding: 12px;
      box-shadow: var(--card-shadow);
      margin-top: 10px;
      transition: all 0.3s ease;
    }

    .practice-line-list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .line-item {
      background: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
      padding: 14px 16px;
      border-radius: 14px;
      border: 1px solid rgba(0, 0, 0, 0.06);
      font-size: 14px;
      color: #374151;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      position: relative;
    }

    .line-item::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 3px;
      background: transparent;
      border-radius: 0 2px 2px 0;
      transition: all 0.25s ease;
    }

    .line-item:hover {
      background: linear-gradient(180deg, #ffffff 0%, #f8f9fb 100%);
      border-color: rgba(99, 102, 241, 0.15);
      transform: translateX(4px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }

    .line-item:hover::before {
      background: linear-gradient(180deg, #a5b4fc 0%, #c4b5fd 100%);
    }

    .line-item.other-speaker {
      background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
      border: 1px solid rgba(99, 102, 241, 0.08);
    }

    .line-item.practice-success {
      background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
      border: 1px solid rgba(16, 185, 129, 0.3);
      color: #065f46;
    }

    .line-item.practice-success::before {
      background: linear-gradient(180deg, #10b981 0%, #059669 100%);
    }

    .line-item.current {
      background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
      border: 2px solid #fbbf24;
      color: #1e293b;
      font-weight: 500;
      transform: translateX(6px);
      box-shadow: 0 6px 20px rgba(251, 191, 36, 0.2);
    }

    .line-item.current::before {
      background: linear-gradient(180deg, #fbbf24 0%, #f59e0b 100%);
    }

    .line-item.current::after {
      content: '';
      position: absolute;
      left: -7px;
      top: 14px;
      width: 6px;
      height: 28px;
      border-radius: 999px;
      background: #f59e0b;
      box-shadow: 0 0 12px rgba(245, 158, 11, 0.6);
      animation: pulseLine 1.6s ease-in-out infinite;
    }

    @keyframes pulseLine {
      0%, 100% { transform: scaleY(1); opacity: 0.9; }
      50% { transform: scaleY(0.7); opacity: 0.6; }
    }

    /* 你的角色 - 默认状态（未激活时显示较淡的颜色） */
    .line-item.my-role {
      background: linear-gradient(180deg, #fffbeb 0%, #fef9e7 100%);
      border: 1px solid rgba(245, 158, 11, 0.25);
      color: #78350f;
      font-weight: 500;
    }

    .line-item.my-role::before {
      background: linear-gradient(180deg, rgba(245, 158, 11, 0.4) 0%, rgba(217, 119, 6, 0.4) 100%);
    }

    /* 你的角色 - 当前激活行（高亮显示） */
    .line-item.my-role.current {
      background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
      border: 2px solid #f59e0b;
      color: #451a03;
      font-weight: 600;
      transform: translateX(8px) scale(1.01);
      box-shadow: 0 8px 24px rgba(245, 158, 11, 0.25);
      z-index: 2;
      animation: highlightFade 0.35s ease;
    }

    .line-item.my-role.current::before {
      background: linear-gradient(180deg, #f59e0b 0%, #d97706 100%);
    }

    body.mode-shadowing .line-item.my-role,
    body.mode-shadowing .line-item.other-speaker {
      background: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
      border: 1px solid rgba(0, 0, 0, 0.06);
      color: #374151;
    }

    body.mode-shadowing .line-item.my-role::before,
    body.mode-shadowing .line-item.other-speaker::before {
      background: transparent;
    }

    body.mode-shadowing .line-speaker {
      display: none;
    }

    body.mode-dialogue .line-speaker {
      display: block;
    }

    .practice-current-line {
      background: linear-gradient(135deg, #e0e7ff 0%, #f0f9ff 100%);
      border: 2px solid rgba(99, 102, 241, 0.45);
      border-radius: 14px;
      padding: 14px;
      margin-bottom: 12px;
      margin-top: 0;
      color: #1f2937;
      box-shadow: 0 10px 20px rgba(99, 102, 241, 0.18);
    }

    .practice-current-line.practice-successful {
      border-color: rgba(16, 185, 129, 0.6);
      background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
      color: #14532d;
    }

    .practice-current-meta {
      font-size: 12px;
      font-weight: 700;
      color: #115e59;
      margin-bottom: 6px;
      letter-spacing: 0.02em;
      text-transform: uppercase;
    }

    .practice-current-text {
      font-size: 16px;
      line-height: 1.45;
      font-weight: 600;
      color: inherit;
    }

    .practice-current-time {
      font-size: 12px;
      color: #6b7280;
      margin-top: 6px;
    }

    .practice-word-correct {
      background: rgba(16, 185, 129, 0.1);
      border-bottom: 2px solid rgba(16, 185, 129, 0.85);
      border-radius: 4px;
      padding: 0 2px;
      color: inherit;
    }

    .line-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 10px;
      font-size: 12px;
      font-weight: 600;
    }

    .line-meta {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .line-number {
      color: #94a3b8;
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.02em;
    }

    .line-time {
      color: #9ca3af;
      font-size: 11px;
      font-weight: 500;
      font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    }

    .line-text {
      line-height: 1.6;
      font-size: 14px;
      color: #334155;
      white-space: normal;
      word-break: break-word;
    }

    .line-translation {
      margin-top: 6px;
      font-size: 13px;
      color: #64748b;
      display: none;
      padding-left: 10px;
      border-left: 3px solid rgba(59, 130, 246, 0.25);
    }

    .line-item.show-translation .line-translation {
      display: block;
    }

    .line-difficulty {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 2px 8px;
      border-radius: 999px;
      font-size: 11px;
      font-weight: 600;
      color: #b45309;
      background: rgba(245, 158, 11, 0.15);
      border: 1px solid rgba(245, 158, 11, 0.2);
    }

    .vocab-word {
      color: #2563eb;
      font-weight: 600;
      cursor: pointer;
      padding: 0 2px;
      border-radius: 4px;
      background: rgba(37, 99, 235, 0.08);
    }

    .vocab-word:hover {
      background: rgba(37, 99, 235, 0.2);
    }

    .line-speaker {
      color: #0f766e;
      font-size: 12px;
      margin-bottom: 8px;
      font-weight: 700;
      letter-spacing: 0.01em;
    }

    .line-item.other-speaker .line-speaker {
      color: #14b8a6;
      font-weight: 600;
    }

    .practice-dict-modal {
      position: fixed;
      inset: 0;
      z-index: 9999;
      display: grid;
      place-items: center;
    }

    .practice-dict-backdrop {
      position: absolute;
      inset: 0;
      background: rgba(15, 23, 42, 0.65);
      backdrop-filter: blur(4px);
    }

    .practice-dict-panel {
      position: relative;
      z-index: 1;
      width: min(760px, 92vw);
      max-height: 80vh;
      overflow-y: auto;
      background: #fff;
      border-radius: 16px;
      padding: 16px;
      box-shadow: 0 20px 50px rgba(15, 23, 42, 0.35);
    }

    .practice-dict-close {
      position: absolute;
      top: 10px;
      right: 12px;
      border: none;
      background: #f1f5f9;
      color: #475569;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      cursor: pointer;
      font-size: 14px;
    }

    .practice-dict-content {
      padding-top: 10px;
    }

    /* 移动端 - Float动画 */
    @keyframes float {

      0%,
      100% {
        transform: translateY(0);
      }

      50% {
        transform: translateY(-4px);
      }
    }

    /* 移动端 - 控制按钮通用样式 */
    .control-btn {
      flex: 1;
      padding: 10px;
      border: none;
      border-radius: 8px;
      font-size: 18px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.2s, opacity 0.3s;
    }

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

    .control-btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .start-btn {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: white;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    }

    .pause-btn {
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: white;
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
    }

    .prev-btn {
      background: linear-gradient(135deg, #0f766e 0%, #115e59 100%);
      color: white;
      box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    }

    .next-btn {
      background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
      color: white;
      box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
    }

    @keyframes pulse {

      0%,
      100% {
        transform: scale(1);
      }

      50% {
        transform: scale(1.05);
      }
    }

    .action-hint {
      display: none;
    }

    /* 控制模式面板 */
    .control-modes-panel {
      grid-area: audio;
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 2rem;
      background: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
      padding: 1rem 2rem;
      border-top: 1px solid #e5e7eb;
      border-right: 1px solid #e5e7eb;
      overflow-x: auto;
      scrollbar-width: none;
      margin: 0;
    }

    /* 移动端 - 模式标签 */
    .mode-section-label {
      font-size: 12px;
      color: #475569;
      font-weight: 700;
      white-space: nowrap;
    }

    /* 移动端 - 播放模式 */
    .audio-mode-toggle {
      display: flex;
      align-items: center;
      gap: 8px;
      overflow-x: auto;
      scrollbar-width: none;
    }

    .audio-mode-toggle::-webkit-scrollbar {
      display: none;
    }

    .recording-indicator {
      font-size: 11px;
      color: #10b981;
      font-weight: 600;
      white-space: nowrap;
    }

    /* Immersive Mode - Hide elements when active */
    /* body.immersive-active .back-header,  <-- REMOVED to keep back button visible */
    body.immersive-active .practice-banner,
    body.immersive-active .mode-live-header,
    body.immersive-active .shadowing-status,
    body.immersive-active .speed-selector-group,
    body.immersive-active .practice-hint {
      display: none !important;
    }

    /* Immersive Mode - Hide Speaker Labels */
    body.immersive-active .line-speaker {
      display: none !important;
    }

    /* Immersive Mode - Suppress 'My Role' highlight for non-current lines */
    body.immersive-active .line-item.my-role:not(.current) {
      background: #f4f4f8;
      border: 1px solid rgba(0, 0, 0, 0.04);
      color: #4b5563;
      font-weight: normal;
    }

    /* Immersive Mode - Ensure Current Line is still highlighted strongly */
    body.immersive-active .line-item.current {
      background: linear-gradient(135deg, #fff8e1 0%, #ffe0b2 100%) !important;
      border: 2px solid #ffb74d !important;
      color: #3f3d56 !important;
      font-weight: 600 !important;
      transform: scale(1.02);
      z-index: 10;
    }

    /* 移动端 - 录音模式（自动练习控制）*/
    .auto-practice-controls {
      display: flex;
      flex-direction: column;
      gap: 8px;
      padding: 12px 16px;
      background: rgba(255, 255, 255, 0.98);
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: 16px 16px 0 0;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
      position: fixed;
      bottom: 60px;
      left: 0;
      right: 0;
      z-index: 1000;
      backdrop-filter: blur(10px);
      border-bottom: none;
    }

    /* 确保 hidden 属性生效 */
    .auto-practice-controls[hidden] {
      display: none !important;
    }

    /* 独立的开始录音按钮 - 紧凑的话筒图标
       避免与全局“反馈”浮动按钮（通常位于右下角 16-24px）重叠：
       - 默认向上抬高一段距离
       - 桌面端再额外抬高，留出更舒适的间距 */
    .start-recording-fab {
      position: fixed;
      bottom: 88px;
      right: 22px;
      z-index: 999;
      background: linear-gradient(135deg, #115e59 0%, #ea580c 60%, #f97316 100%);
      color: white;
      border: none;
      border-radius: 50%;
      width: 56px;
      height: 56px;
      font-size: 16px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 22px rgba(79, 70, 229, 0.35);
      cursor: pointer;
      transition: all 0.3s ease;
      animation: pulse 2s infinite;
    }

    /* 桌面端：进一步上移，避免与右下角工具/反馈悬浮区重叠 */
    @media (min-width: 768px) {
      .start-recording-fab {
        bottom: 120px;
        right: 26px;
      }
    }

    .start-recording-fab:active {
      transform: scale(0.9);
    }

    .start-recording-fab[hidden] {
      display: none !important;
    }

    .fab-icon {
      font-size: 28px;
      animation: bounce 1s infinite;
    }

    .fab-text {
      display: none;
    }

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.35);
        transform: scale(1);
      }

      70% {
        box-shadow: 0 0 0 15px rgba(99, 102, 241, 0);
        transform: scale(1.05);
      }

      100% {
        box-shadow: 0 0 0 0 rgba(244, 63, 94, 0);
        transform: scale(1);
      }
    }

    .start-recording-fab.recording,
    .fab-record-btn.recording {
      animation: micBreath 1.6s ease-in-out infinite;
    }

    @keyframes micBreath {
      0%, 100% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.5);
        transform: scale(1);
      }
      50% {
        box-shadow: 0 0 0 12px rgba(99, 102, 241, 0);
        transform: scale(1.06);
      }
    }

    /* Progress Bar */
    .practice-progress-container {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: rgba(0, 0, 0, 0.05);
      z-index: 100;
    }

    .practice-progress-bar {
      height: 100%;
      background: var(--primary-gradient);
      width: 0%;
      transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
      border-radius: 0 2px 2px 0;
      box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
    }

    /* Floating Action Button (TikTok Style) */
    .fab-record-container {
      position: fixed;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1000;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .fab-record-btn {
      width: 72px;
      height: 72px;
      border-radius: 50%;
      background: var(--accent-color);
      /* Rose color */
      border: 4px solid rgba(255, 255, 255, 0.3);
      color: white;
      font-size: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 10px 25px rgba(244, 63, 94, 0.4);
      transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
      -webkit-tap-highlight-color: transparent;
    }

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

    .fab-record-btn.recording {
      background: white;
      color: var(--accent-color);
      animation: pulse 1.5s infinite;
      border-color: var(--accent-color);
    }

    .fab-record-btn.recording .fab-icon {
      border-radius: 4px;
      /* Square stop icon */
      transform: scale(0.8);
    }

    .mode-panel {
      opacity: 0;
      transform: translateY(10px);
      transition: opacity 0.25s ease, transform 0.25s ease;
    }

    .mode-panel.active {
      opacity: 1;
      transform: translateY(0);
    }

    .mode-transitioning .practice-content,
    .mode-transitioning .practice-line-list,
    .mode-transitioning .practice-score-panel {
      transition: opacity 0.25s ease, transform 0.25s ease;
      opacity: 0.7;
      transform: translateY(6px);
    }

    .practice-progress-ring {
      position: absolute;
      right: 16px;
      bottom: 16px;
      width: 74px;
      height: 74px;
      border-radius: 50%;
      --progress: 0%;
      background: conic-gradient(#0f766e var(--progress, 0%), rgba(255, 255, 255, 0.2) 0%);
      display: grid;
      place-items: center;
      border: 2px solid rgba(255, 255, 255, 0.6);
      box-shadow: 0 10px 26px rgba(15, 23, 42, 0.25);
      backdrop-filter: blur(6px);
      z-index: 8;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.2s ease;
    }

    .practice-progress-ring::before {
      content: '';
      position: absolute;
      inset: 6px;
      border-radius: 50%;
      background: rgba(15, 23, 42, 0.65);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .practice-progress-ring .ring-label {
      position: relative;
      z-index: 1;
      text-align: center;
      color: #f8fafc;
      font-weight: 600;
    }

    .practice-progress-ring .ring-value {
      font-size: 0.9rem;
    }

    .practice-progress-ring .ring-text {
      font-size: 0.6rem;
      opacity: 0.8;
    }

    [data-theme="dark"] .practice-content,
    [data-theme="dark"] .card,
    [data-theme="dark"] .video-card,
    [data-theme="dark"] .lines-card {
      background: rgba(15, 23, 42, 0.85) !important;
      border-color: rgba(148, 163, 184, 0.2) !important;
      color: #e2e8f0;
    }

    [data-theme="dark"] .line-item {
      background: linear-gradient(180deg, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 0.95) 100%);
      border-color: rgba(148, 163, 184, 0.2);
      color: #e2e8f0;
    }

    [data-theme="dark"] .line-item.current {
      background: linear-gradient(135deg, rgba(30, 64, 175, 0.35) 0%, rgba(15, 23, 42, 0.9) 100%);
      border-color: rgba(99, 102, 241, 0.7);
      box-shadow: 0 6px 18px rgba(30, 64, 175, 0.4);
    }

    [data-theme="dark"] .line-speaker {
      color: #a5b4fc;
    }

    [data-theme="dark"] .practice-score-panel,
    [data-theme="dark"] .practice-score-card {
      background: rgba(15, 23, 42, 0.9);
      border-color: rgba(148, 163, 184, 0.2);
      color: #e2e8f0;
    }

    .fab-label {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      background: rgba(255, 255, 255, 0.9);
      padding: 4px 8px;
      border-radius: 12px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      opacity: 0;
      transform: translateY(10px);
      transition: all 0.3s;
    }

    .fab-record-container:hover .fab-label {
      opacity: 1;
      transform: translateY(0);
    }

    /* Hide default bottom controls on mobile when FAB is active */
    @media (max-width: 1023px) {
      .auto-practice-controls {
        padding-bottom: 100px;
        /* Make space for FAB */
      }

      /* Hide the old start button if we use FAB */
      .start-recording-fab {
        display: none !important;
      }
    }

    @keyframes bounce {

      0%,
      100% {
        transform: translateY(0);
      }

      50% {
        transform: translateY(-3px);
      }
    }

    .status-indicator-inline {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .status-icon-inline {
      font-size: 20px;
      animation: float 2s ease-in-out infinite;
    }

    .status-content {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .status-text-inline {
      font-size: 13px;
      font-weight: 600;
      color: #1f2937;
    }

    .analysis-progress {
      position: relative;
      height: 6px;
      background: #e2e8f0;
      border-radius: 999px;
      overflow: hidden;
    }

    .analysis-progress .analysis-bar {
      position: absolute;
      inset: 0;
      width: 40%;
      background: linear-gradient(90deg, #60a5fa, #22c55e, #60a5fa);
      animation: analysisMove 1.2s ease-in-out infinite;
    }

    .analysis-progress.complete .analysis-bar {
      width: 100%;
      animation: none;
    }

    .analysis-meta {
      font-size: 12px;
      color: #64748b;
    }

    @keyframes analysisMove {
      0% {
        transform: translateX(-60%);
      }

      100% {
        transform: translateX(160%);
      }
    }

    .auto-control-buttons-inline {
      display: flex;
      gap: 8px;
    }

    .auto-control-buttons-inline .control-btn {
      flex: 1;
      padding: 10px;
      font-size: 18px;
    }

    /* VAD indicator */
    .vad-indicator {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-left: 10px;
    }

    .vad-bar {
      width: 90px;
      height: 8px;
      border-radius: 6px;
      background: #e5e7eb;
      overflow: hidden;
      box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06);
    }

    .vad-fill {
      height: 100%;
      width: 0%;
      background: linear-gradient(90deg, #93c5fd 0%, #60a5fa 60%, #34d399 100%);
      transition: width 0.12s ease;
    }

    .vad-label {
      font-size: 12px;
      font-weight: 700;
      color: #475569;
      min-width: 40px;
    }

    .recording-status-chip {
      display: flex;
      flex-direction: column;
      gap: 4px;
      padding: 10px 12px;
      margin-top: 8px;
      border-radius: 10px;
      background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
      border: 1px solid rgba(99, 102, 241, 0.25);
      box-shadow: 0 12px 30px rgba(99, 102, 241, 0.12);
      max-width: 420px;
    }

    .recording-status-chip .main {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      color: #1f2937;
    }

    .recording-status-chip .sub {
      font-size: 12px;
      color: #475569;
      line-height: 1.4;
    }

    .audio-mode-btn {
      padding: 6px 10px;
      border: 1px solid #e2e8f0;
      background: white;
      color: #475569;
      border-radius: 8px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
    }

    .audio-mode-btn:hover:not(:disabled) {
      border-color: #667eea;
      color: #3b82f6;
      transform: translateY(-1px);
    }

    .audio-mode-btn.active {
      background: linear-gradient(135deg, #60a5fa 0%, #ea580c 100%);
      border-color: transparent;
      color: white;
      box-shadow: 0 4px 10px rgba(76, 110, 245, 0.25);
    }

    .audio-mode-btn:disabled {
      opacity: 0.55;
      cursor: not-allowed;
    }

    /* Rename overlay */
    .rename-overlay {
      position: fixed;
      inset: 0;
      display: none;
      align-items: center;
      justify-content: center;
      backdrop-filter: blur(2px);
      background: rgba(0, 0, 0, 0.35);
      z-index: 10000;
    }

    .rename-card {
      background: #fff;
      border-radius: 12px;
      padding: 16px;
      width: min(520px, 92vw);
      box-shadow: 0 18px 40px rgba(0, 0, 0, 0.25);
    }

    .rename-card h3 {
      margin: 0 0 8px 0;
      font-size: 16px;
    }

    .rename-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
      max-height: 50vh;
      overflow: auto;
      margin: 8px 0 12px;
    }

    .rename-row {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .rename-row label {
      width: 88px;
      font-size: 12px;
      color: #64748b;
    }

    .rename-row input {
      flex: 1;
      padding: 8px 10px;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 14px;
    }

    .rename-actions {
      display: flex;
      justify-content: flex-end;
      gap: 8px;
    }

    .btn-small {
      padding: 6px 10px;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      background: #fff;
      font-weight: 600;
      cursor: pointer;
    }

    .btn-primary {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: #fff;
      border-color: transparent;
    }

    /* Practice progress chip */
    .practice-progress-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 999px;
      background: rgba(16, 185, 129, 0.12);
      color: #065f46;
      font-weight: 700;
      font-size: 12px;
      border: 1px solid rgba(16, 185, 129, 0.35);
      margin-left: 8px;
      white-space: nowrap;
    }

    /* Common toast styles moved to feedback.js */

    .recording-indicator {
      font-size: 12px;
      color: #16a34a;
      font-weight: 600;
      white-space: nowrap;
      margin-left: 4px;
    }

    .debug-log {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 120px;
      background: rgba(0, 0, 0, 0.85);
      color: #0f0;
      font-family: monospace;
      font-size: 10px;
      overflow-y: auto;
      padding: 8px;
      z-index: 99999;
      display: none;
      pointer-events: none;
    }

    .play-overlay {
      position: absolute;
      inset: 0;
      background: rgba(0, 0, 0, 0.4);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 20;
      cursor: pointer;
      backdrop-filter: blur(2px);
    }

    .play-overlay-icon {
      width: 64px;
      height: 64px;
      background: rgba(255, 255, 255, 0.9);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      animation: pulse 2s infinite;
    }

    .play-overlay-icon::after {
      content: '';
      display: block;
      width: 0;
      height: 0;
      border-style: solid;
      border-width: 10px 0 10px 16px;
      border-color: transparent transparent transparent #333;
      margin-left: 4px;
    }

    @keyframes pulse {
      0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7);
      }

      70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(255, 255, 255, 0);
      }

      100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
      }
    }



    .debug-log.hidden {
      display: none;
    }

    .debug-log h4 {
      margin: 0 0 6px;
      font-size: 13px;
      color: #93c5fd;
    }

    .debug-log-entry {
      margin-bottom: 4px;
      line-height: 1.35;
      word-break: break-word;
    }

    .debug-log-entry time {
      color: #9ca3af;
      margin-right: 4px;
    }

    @keyframes pulse {

      0%,
      100% {
        transform: scale(1);
      }

      50% {
        transform: scale(1.05);
      }
    }

    .bottom-nav {
      z-index: 300 !important;
      background: transparent !important;
      border-top: none !important;
      box-shadow: none !important;
    }

    /* Hide all bottom nav items completely */
    .bottom-nav .nav-item {
      opacity: 0 !important;
      pointer-events: none !important;
    }

    /* Mobile back button for practice session */
    .mobile-practice-back {
      position: absolute;
      top: 12px;
      left: 12px;
      z-index: 1001;
      background: rgba(0, 0, 0, 0.5);
      color: white;
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 50%;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 24px;
      transition: all 0.2s ease;
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }

    .mobile-practice-back:active {
      transform: scale(0.92);
      background: rgba(0, 0, 0, 0.7);
    }

    .mobile-practice-back:hover {
      background: rgba(0, 0, 0, 0.8);
      transform: scale(1.05);
    }

    .mobile-practice-back:active {
      transform: scale(0.95);
    }

    /* ===== 桌面端专用布局 (New) ===== */
    @media (min-width: 768px) {
      body {
        display: flex;
        flex-direction: column;
        height: 100vh;
        margin: 0;
        background: #f8fafc;
        /* Lighter, cooler background */
        overflow: hidden;
        font-family: 'Inter', system-ui, -apple-system, sans-serif;
      }

      .page-shell {
        display: flex;
        flex-direction: column;
        height: 100%;
      }

      /* Header & Banner */
      .back-header {
        flex-shrink: 0;
        background: white;
        border-bottom: 1px solid #e2e8f0;
        padding: 16px 32px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 10;
      }

      .practice-banner {
        display: none;
        /* Hide the separate banner, integrate into header if needed or just remove for cleaner look */
      }

      .back-btn {
        color: #475569;
        font-weight: 600;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 8px 16px;
        border-radius: 8px;
        transition: all 0.2s;
        background: #f1f5f9;
      }

      .back-btn:hover {
        background: #e2e8f0;
        color: #1e293b;
      }

      /* Main Grid Layout - 优化版，减少顶部padding */
      .practice-grid {
        flex: 1;
        display: grid;
        grid-template-columns: 420px 1fr;
        /* Slightly narrower left column */
        gap: 24px;
        padding: 16px 24px 24px;
        overflow: hidden;
        max-width: 1600px;
        margin: 0 auto;
        width: 100%;
        box-sizing: border-box;
      }

      @media (min-width: 1280px) {
        .practice-grid {
          grid-template-columns: 480px 1fr;
        }
      }

      @media (min-width: 1600px) {
        .practice-grid {
          grid-template-columns: 640px 1fr;
        }
      }

      /* Left Column - 优化间距 */
      .practice-left {
        display: flex;
        flex-direction: column;
        gap: 16px;
        overflow-y: auto;
        padding-right: 4px;
        height: 100%;
      }

      /* Right Column */
      .practice-right {
        display: flex;
        flex-direction: column;
        height: 100%;
        overflow: hidden;
        background: white;
        border-radius: 24px;
        border: 1px solid #e2e8f0;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
      }

      /* Cards */
      .card {
        background: white;
        border-radius: 20px;
        border: 1px solid #e2e8f0;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
        overflow: hidden;
      }

      .card-header {
        padding: 20px 24px;
        border-bottom: 1px solid #f1f5f9;
        background: white;
      }

      .card-header h3 {
        margin: 0;
        font-size: 1.1rem;
        font-weight: 700;
        color: #1e293b;
      }

      /* Video Card */
      .video-card {
        background: linear-gradient(180deg, #0a0a0a 0%, #1a1a1a 100%);
        border: none;
        overflow: hidden;
        aspect-ratio: 16/9;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        box-shadow: 0 12px 24px -6px rgba(0, 0, 0, 0.25), 0 4px 8px rgba(0, 0, 0, 0.1);
        border-radius: 18px;
        position: relative;
      }

      .video-card::before {
        content: '';
        position: absolute;
        inset: 0;
        border-radius: 18px;
        pointer-events: none;
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
      }

      .video-player-container {
        width: 100%;
        height: 100%;
        position: relative;
      }

      .video-player-container video {
        width: 100%;
        height: 100%;
        object-fit: contain;
      }

      /* Mode Selector Card */
      .mode-selector-card {
        padding: 0;
        flex-shrink: 0;
      }

      .mode-tabs {
        display: flex;
        padding: 20px;
        gap: 16px;
        background: white;
      }

      .mode-tab {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 10px;
        padding: 16px;
        border: 2px solid #f1f5f9;
        border-radius: 16px;
        background: white;
        cursor: pointer;
        transition: all 0.2s;
      }

      .mode-tab:hover {
        border-color: #cbd5e1;
        background: #f8fafc;
        transform: translateY(-2px);
      }

      .mode-tab.active {
        border-color: #0f766e;
        background: #eef2ff;
        color: #115e59;
        box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
      }

      .mode-icon {
        font-size: 1.75rem;
      }

      .mode-label {
        font-size: 0.95rem;
        font-weight: 600;
      }

      .mode-description {
        padding: 0 24px 20px;
        color: #64748b;
        font-size: 0.95rem;
        text-align: center;
        line-height: 1.5;
      }

      .start-practice-btn {
        width: calc(100% - 48px);
        margin: 0 24px 24px;
        padding: 16px;
        background: linear-gradient(135deg, #115e59 0%, #0f5e52 100%);
        color: white;
        border: none;
        border-radius: 14px;
        font-weight: 600;
        font-size: 1.05rem;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        transition: all 0.2s;
        box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
      }

      .start-practice-btn:hover {
        transform: translateY(-1px);
        box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3);
      }

      .start-practice-btn:active {
        transform: scale(0.98);
      }

      /* Controls Card - 优化padding */
      .controls-card {
        padding: 16px 20px;
        flex-shrink: 0;
      }

      /* Control Buttons Styling - Modernized */
      .shadowing-start-btn,
      .reading-record-btn,
      .reading-listen-btn {
        padding: 14px;
        border-radius: 12px;
        font-weight: 600;
        cursor: pointer;
        border: none;
        transition: all 0.2s;
        font-size: 1rem;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: 100%;
      }

      .shadowing-start-btn {
        background: #115e59;
        color: white;
        box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
      }

      .shadowing-start-btn:hover {
        background: #0f5e52;
      }

      .shadowing-pause-btn {
        background: #f59e0b;
        color: white;
        width: 100%;
        padding: 14px;
        border-radius: 12px;
        font-weight: 600;
        border: none;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
      }

      .speed-selector-group {
        margin-bottom: 20px;
      }

      .speed-selector-group label {
        display: block;
        font-size: 0.85rem;
        font-weight: 600;
        color: #64748b;
        margin-bottom: 8px;
        text-transform: uppercase;
        letter-spacing: 0.05em;
      }

      .speed-buttons {
        display: flex;
        gap: 8px;
        background: #f1f5f9;
        padding: 4px;
        border-radius: 10px;
      }

      .speed-btn {
        flex: 1;
        padding: 8px;
        border: none;
        background: transparent;
        border-radius: 8px;
        cursor: pointer;
        font-size: 0.9rem;
        font-weight: 500;
        color: #64748b;
        transition: all 0.2s;
      }

      .speed-btn:hover {
        color: #1e293b;
        background: rgba(255, 255, 255, 0.5);
      }

      .speed-btn.active {
        background: white;
        color: #115e59;
        font-weight: 600;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
      }

      /* Native Player Controls */
      .native-controls {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 24px;
        margin: 20px 0;
      }

      .native-btn {
        border: none;
        background: white;
        border-radius: 50%;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      }

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

      .native-btn.secondary {
        width: 48px;
        height: 48px;
        color: #64748b;
        border: 1px solid #e2e8f0;
      }

      .native-btn.secondary:hover {
        background: #f8fafc;
        color: #0f172a;
        border-color: #cbd5e1;
      }

      .native-btn.primary {
        width: 64px;
        height: 64px;
        background: linear-gradient(135deg, #115e59 0%, #0f5e52 100%);
        color: white;
        font-size: 24px;
        box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3), 0 4px 6px -2px rgba(79, 70, 229, 0.1);
      }

      .native-btn.primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 20px 25px -5px rgba(79, 70, 229, 0.4), 0 10px 10px -5px rgba(79, 70, 229, 0.2);
      }

      .native-btn.primary:active {
        transform: translateY(0);
      }

      .native-control-icon {
        width: 24px;
        height: 24px;
        fill: currentColor;
      }

      .native-control-icon.large {
        width: 32px;
        height: 32px;
      }

      .speed-selector-compact {
        display: flex;
        justify-content: center;
        gap: 8px;
        margin-top: 16px;
        padding-top: 16px;
        border-top: 1px solid #f1f5f9;
      }

      .speed-btn-compact {
        padding: 4px 12px;
        border-radius: 20px;
        font-size: 0.8rem;
        background: transparent;
        border: 1px solid transparent;
        color: #64748b;
        cursor: pointer;
        transition: all 0.2s;
      }

      .speed-btn-compact:hover {
        background: #f1f5f9;
      }

      .speed-btn-compact.active {
        background: #eff6ff;
        color: #115e59;
        border-color: #e0e7ff;
        font-weight: 600;
      }

      .practice-hint {
        margin-top: 16px;
        padding: 12px;
        background: #f8fafc;
        border-radius: 8px;
        color: #64748b;
        font-size: 0.85rem;
        text-align: center;
        border: 1px dashed #cbd5e1;
      }

      /* Lines Card - Right Column */
      .lines-card {
        flex: 1;
        display: flex;
        flex-direction: column;
        padding: 0;
        height: 100%;
        border: none;
        /* Removed border as parent has it */
        box-shadow: none;
        border-radius: 0;
        background: transparent;
      }

      .lines-container {
        flex: 1;
        overflow-y: auto;
        padding: 0;
        /* Padding handled by list */
        scroll-behavior: smooth;
        background: white;
        display: flex !important;
        /* Force display */
        flex-direction: column;
      }

      .practice-line-list {
        display: flex !important;
        /* Force display */
        flex-direction: column;
        padding: 24px;
        gap: 0;
        /* Remove gap, use border/padding */
        list-style: none;
        margin: 0;
      }

      .line-item {
        padding: 16px 24px;
        border-bottom: 1px solid #f1f5f9;
        background: white;
        transition: all 0.2s;
        cursor: pointer;
        display: block !important;
        /* Force display */
      }

      .line-item:first-child {
        border-top: 1px solid #f1f5f9;
      }

      .line-item:hover {
        background: #f8fafc;
      }

      .line-item.current {
        background: #f0f9ff;
        /* Light blue highlight */
        border-left: 4px solid #0ea5e9;
        padding-left: 20px;
        /* Adjust for border */
        box-shadow: none;
        transform: none;
        border-color: #e0f2fe;
        /* Top/bottom borders */
      }

      .line-text {
        font-size: 1.05rem;
        line-height: 1.6;
        color: #334155;
      }

      .line-item.current .line-text {
        color: #0f172a;
        font-weight: 500;
        font-size: 1.15rem;
      }

      .line-translation {
        margin-top: 6px;
        color: #94a3b8;
        font-size: 0.95rem;
      }

      /* Current Line Focus Box - Optional, can be integrated into list or kept sticky */
      .practice-current-line {
        display: none !important;
        /* Hide the separate box, we highlight in list */
      }

      /* Hide mobile elements */
      .mobile-practice-back,
      .start-recording-fab,
      .fab-record-container,
      .bottom-nav {
        display: none !important;
      }

      /* Utility */
      .hidden {
        display: none !important;
      }
    }

    /* ========== 动画关键帧 ========== */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(25px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes fadeInScale {
      from {
        opacity: 0;
        transform: scale(0.95);
      }

      to {
        opacity: 1;
        transform: scale(1);
      }
    }

    @keyframes slideInLeft {
      from {
        opacity: 0;
        transform: translateX(-30px);
      }

      to {
        opacity: 1;
        transform: translateX(0);
      }
    }

    @keyframes slideInRight {
      from {
        opacity: 0;
        transform: translateX(30px);
      }

      to {
        opacity: 1;
        transform: translateX(0);
      }
    }

    @keyframes shimmer {
      0% {
        background-position: -200% 0;
      }

      100% {
        background-position: 200% 0;
      }
    }

    @keyframes pulseGlow {

      0%,
      100% {
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.4);
      }

      50% {
        box-shadow: 0 0 20px 5px rgba(102, 126, 234, 0.2);
      }
    }

    @keyframes ripple {
      0% {
        transform: scale(0);
        opacity: 0.6;
      }

      100% {
        transform: scale(4);
        opacity: 0;
      }
    }

    @keyframes spin {
      to {
        transform: rotate(360deg);
      }
    }

    /* ========== 页面加载指示器 ========== */
    .page-loader {
      position: fixed;
      inset: 0;
      background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
      z-index: 99999;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 1.5rem;
      transition: opacity 0.4s ease, visibility 0.4s ease;
    }

    .page-loader.hidden {
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
    }

    .loader-spinner {
      width: 48px;
      height: 48px;
      border: 3px solid #e2e8f0;
      border-top-color: #667eea;
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }

    .loader-text {
      font-size: 1.1rem;
      font-weight: 600;
      color: #64748b;
    }

    /* ========== 入场动画类 ========== */
    .animate-in {
      animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
    }

    .animate-in-left {
      animation: slideInLeft 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
    }

    .animate-in-right {
      animation: slideInRight 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
    }

    .animate-in-scale {
      animation: fadeInScale 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    }

    .animate-delay-1 {
      animation-delay: 0.05s;
    }

    .animate-delay-2 {
      animation-delay: 0.1s;
    }

    .animate-delay-3 {
      animation-delay: 0.15s;
    }

    .animate-delay-4 {
      animation-delay: 0.2s;
    }

    .animate-delay-5 {
      animation-delay: 0.25s;
    }

    /* ========== 增强按钮交互 ========== */
    .mode-tab,
    .start-practice-btn,
    .speed-btn,
    .toggle-btn,
    .back-btn,
    .global-record-btn,
    .global-stop-btn,
    .global-play-btn {
      position: relative;
      overflow: hidden;
      transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .mode-tab::after,
    .start-practice-btn::after,
    .speed-btn::after,
    .toggle-btn::after,
    .back-btn::after,
    .global-record-btn::after,
    .global-stop-btn::after,
    .global-play-btn::after {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      width: 5px;
      height: 5px;
      background: rgba(255, 255, 255, 0.5);
      border-radius: 50%;
      transform: translate(-50%, -50%) scale(0);
      opacity: 0;
    }

    .mode-tab:active::after,
    .start-practice-btn:active::after,
    .speed-btn:active::after,
    .toggle-btn:active::after,
    .back-btn:active::after,
    .global-record-btn:active::after,
    .global-stop-btn:active::after,
    .global-play-btn:active::after {
      animation: ripple 0.4s ease-out;
    }

    /* ========== 模式选择卡片增强 ========== */
    .mode-tab {
      transform-origin: center;
      border: 2px solid transparent;
    }

    .mode-tab:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
      border-color: rgba(102, 126, 234, 0.3);
    }

    .mode-tab:active {
      transform: translateY(-1px) scale(0.98);
    }

    .mode-tab.active {
      animation: pulseGlow 2s ease-in-out infinite;
    }

    .mode-tab .mode-icon {
      transition: transform 0.3s ease;
    }

    .mode-tab:hover .mode-icon {
      transform: scale(1.2) rotate(-5deg);
    }

    /* ========== 开始练习按钮增强 ========== */
    .start-practice-btn {
      background-size: 200% auto;
      transition: all 0.3s ease;
    }

    .start-practice-btn:hover {
      background-position: right center;
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
    }

    .start-practice-btn:active {
      transform: translateY(0) scale(0.98);
    }

    /* ========== 字幕行增强 ========== */
    .line-item {
      transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
      border-left: 3px solid transparent;
    }

    .line-item:hover {
      background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
      transform: translateX(6px);
      border-left-color: #94a3b8;
    }

    .line-item:active {
      transform: translateX(4px) scale(0.995);
    }

    .line-item.current {
      border-left: 4px solid #0ea5e9;
      background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
      transform: translateX(8px);
      box-shadow: 0 4px 15px rgba(14, 165, 233, 0.15);
      animation: highlightFade 0.35s ease;
    }

    @keyframes highlightFade {
      from { opacity: 0.55; transform: translateX(4px); }
      to { opacity: 1; transform: translateX(8px); }
    }

    .line-item.current::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 4px;
      background: linear-gradient(180deg, #0ea5e9 0%, #f97316 100%);
      animation: pulseGlow 2s ease-in-out infinite;
    }

    /* ========== 视频选择模态框增强 ========== */
    #video-select-modal>div:first-child {
      animation: fadeInScale 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    /* ========== 视频卡片增强 ========== */
    .video-option {
      transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
      position: relative;
      overflow: hidden;
    }

    .video-option::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 60%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
      transition: left 0.5s ease;
      pointer-events: none;
    }

    .video-option:hover::before {
      left: 120%;
    }

    .video-option:hover {
      transform: translateY(-4px) scale(1.02);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
    }

    .video-option:active {
      transform: translateY(-2px) scale(0.99);
    }

    /* ========== 速度选择按钮增强 ========== */
    .speed-btn {
      transform-origin: center;
    }

    .speed-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .speed-btn.active {
      animation: pulseGlow 2.5s ease-in-out infinite;
    }

    /* ========== 切换按钮增强 ========== */
    .toggle-btn:hover {
      transform: translateY(-2px);
    }

    .toggle-btn.active {
      box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    }

    /* ========== 录音按钮增强 ========== */
    .global-record-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(244, 67, 54, 0.3);
    }

    .global-stop-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 152, 0, 0.3);
    }

    .global-play-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(33, 150, 243, 0.3);
    }

    /* ========== 返回按钮增强 ========== */
    .back-btn:hover {
      transform: translateX(-4px);
      box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
    }

    /* ========== 骨架屏样式 ========== */
    .skeleton {
      background: linear-gradient(90deg, #f1f5f9 0%, #e2e8f0 50%, #f1f5f9 100%);
      background-size: 200% 100%;
      animation: shimmer 1.5s ease-in-out infinite;
      border-radius: 8px;
    }

    .skeleton-video {
      width: 100%;
      height: 120px;
      margin-bottom: 8px;
    }

    .skeleton-title {
      height: 1rem;
      width: 75%;
      margin-bottom: 6px;
    }

    .skeleton-meta {
      height: 0.75rem;
      width: 50%;
    }

/* =========================================
   PRACTICE SESSION OVERRIDES (from head)
   ========================================= */
    /* Practice Session Specific Styles */
    .practice-container {
      padding: 0;
      padding-bottom: 0;
      min-height: 100vh;
    }

    /* Voice/Lang Option Styles (提取自内联样式) */
    .voice-option,
    .lang-option {
      padding: 0.6rem 0.8rem;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s ease;
      color: #0f172a;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .voice-option:hover,
    .lang-option:hover {
      background: #f1f5f9;
    }
    .voice-option.active,
    .lang-option.active {
      background: #0f766e;
      color: white;
    }
    .voice-group-label {
      padding: 0.4rem 0.8rem;
      font-size: 0.75rem;
      font-weight: 700;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .dropdown-divider {
      height: 1px;
      background: #e0e0e0;
      margin: 0.5rem 0;
    }

    body {
      background: radial-gradient(circle at 20% 20%, #f6f8ff 0%, #eef2f7 35%, #e8ecf5 70%, #e3e8f0 100%);
    }

    .page-shell {
      max-width: 1260px;
      margin: 0 auto;
      padding: 20px 22px 40px;
    }

    .back-header {
      max-width: 1260px;
      margin: 0 auto 8px;
      padding: 6px 12px;
      border-radius: 10px;
      background: linear-gradient(135deg, #111827 0%, #1f2937 60%, #0f172a 100%);
      box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
      display: flex;
      /* Unhide to allow navigation back */
      align-items: center;
      gap: 8px;
    }

    .practice-banner {
      max-width: 1260px;
      margin: 0 auto 8px;
      border-radius: 12px;
      background: linear-gradient(120deg, #0ea5e9 0%, #38bdf8 45%, #fb923c 100%);
      box-shadow: 0 6px 20px rgba(14, 165, 233, 0.2);
      padding: 10px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: #e0f2fe;
    }

    .practice-banner h2 {
      margin: 0;
      color: #fff;
      font-size: 1.4rem;
    }

    .practice-banner .breadcrumb {
      font-size: 0.95rem;
      color: #e0f2fe;
    }

    .practice-mode-selector {
      max-width: 1260px;
      margin: 0 auto 16px;
      border-radius: 16px;
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
    }

    .practice-main {
      display: grid;
      grid-template-columns: 1.3fr 0.7fr;
      gap: 16px;
      align-items: start;
      max-width: 1400px;
      margin: 0 auto;
    }

    .player-card,
    .controls-card {
      background: #fff;
      border-radius: 18px;
      box-shadow: 0 16px 40px rgba(15, 23, 42, 0.10);
      overflow: hidden;
      border: 1px solid #e5e7eb;
    }

    .player-card {
      padding: 0;
    }

    .controls-card {
      padding: 12px;
    }

    .video-player-container {
      border-right: none;
      border-radius: 18px;
      overflow: hidden;
      min-height: 520px;
      background: #0b1221;
    }

    .practice-controls {
      border-right: none;
      border-top: none;
      box-shadow: none;
      padding: 1.2rem 1.1rem 1.7rem;
      background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
      border-radius: 12px;
      border: 1px solid #e2e8f0;
    }

    @media (max-width: 1024px) {
      .practice-main {
        grid-template-columns: 1fr;
      }

      .controls-card {
        padding: 12px;
      }
    }

/* =========================================
   PREMIUM THEME OVERRIDES (Glassmorphism)
   ========================================= */
    /* =========================================
       PREMIUM THEME OVERRIDES (Glassmorphism)
       ========================================= */
    :root {
      /* Re-declare core variables ensuring availability */
      --primary-gradient: linear-gradient(135deg, #0f766e 0%, #f97316 100%);
      --primary-solid: #0f766e;
      --glass-bg: rgba(255, 255, 255, 0.7);
      --glass-border: rgba(255, 255, 255, 0.5);
      --glass-blur: blur(20px);
      --card-shadow: 0 12px 40px -8px rgba(0, 0, 0, 0.12);
      --text-main: #1e293b;
      --text-muted: #64748b;
      --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    }

    body {
      font-family: var(--font-main);
      background: #f1f5f9;
      background-image:
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.1) 0px, transparent 50%);
      color: var(--text-main);
    }

    /* --- Header & Banner --- */
    .back-header {
      background: rgba(255, 255, 255, 0.8) !important;
      backdrop-filter: var(--glass-blur);
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03) !important;
      padding: 0.8rem 2rem !important;
    }

    .back-btn {
      color: var(--text-main) !important;
      background: white !important;
      border: 1px solid #e2e8f0;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
      font-weight: 600 !important;
    }

    .back-btn:hover {
      background: #f8fafc !important;
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    .practice-banner {
      background: rgba(255, 255, 255, 0.85) !important;
      border: 1px solid rgba(99, 102, 241, 0.2) !important;
      padding: 0.35rem 1rem !important;
      border-radius: 999px !important;
      width: fit-content;
      margin: 6px auto 12px !important;
      justify-content: center !important;
    }

    .practice-banner h2 {
      font-size: 1.15rem !important;
      font-weight: 800 !important;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    /* --- Cards --- */
    .card,
    .player-card,
    .controls-card,
    .video-card {
      background: rgba(255, 255, 255, 0.65) !important;
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border) !important;
      border-radius: 24px !important;
      box-shadow: var(--card-shadow) !important;
    }

    .video-player-container {
      border-radius: 20px !important;
      overflow: hidden;
      box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.3) !important;
      background: #000;
      border: 4px solid white;
    }

    /* --- Typography --- */
    h3,
    .section-title {
      font-weight: 700 !important;
      color: var(--text-main) !important;
      letter-spacing: -0.02em;
    }

    /* --- Buttons --- */
    .start-practice-btn {
      background: var(--primary-gradient) !important;
      box-shadow: 0 8px 20px -4px rgba(99, 102, 241, 0.4) !important;
      border-radius: 16px !important;
      padding: 14px 24px !important;
      font-size: 1.1rem !important;
      letter-spacing: 0.5px;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
      border: 1px solid rgba(255, 255, 255, 0.2) !important;
    }

    .start-practice-btn:hover {
      transform: translateY(-2px) !important;
      box-shadow: 0 12px 28px -4px rgba(99, 102, 241, 0.5) !important;
      filter: brightness(1.05);
    }

    .native-btn {
      border-radius: 16px !important;
      border: none !important;
      transition: all 0.2s ease !important;
    }

    .native-btn.primary {
      background: var(--primary-gradient) !important;
      box-shadow: 0 8px 20px -4px rgba(99, 102, 241, 0.4) !important;
    }

    .native-btn.secondary {
      background: white !important;
      color: var(--text-main) !important;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05) !important;
      border: 1px solid #e2e8f0 !important;
    }

    .native-btn:hover {
      transform: scale(1.05);
    }

    /* --- Mode Tabs --- */
    .mode-tab {
      background: white !important;
      border: 1px solid rgba(0, 0, 0, 0.05) !important;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    }

    .mode-tab.active {
      background: #eff6ff !important;
      border-color: #0f766e !important;
      color: #115e59 !important;
      box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2) !important;
    }

    /* --- List Items (Transcript) --- */
    .lines-container {
      padding: 1rem !important;
      scrollbar-width: thin;
      scrollbar-color: #cbd5e1 transparent;
    }

    .lines-container::-webkit-scrollbar {
      width: 6px;
    }

    .lines-container::-webkit-scrollbar-thumb {
      background-color: #cbd5e1;
      border-radius: 10px;
    }

    .line-item {
      margin-bottom: 12px !important;
      padding: 12px 16px !important;
      border-radius: 16px !important;
      border: 1px solid transparent !important;
      transition: all 0.2s ease !important;
    }

    .line-item:hover {
      background: rgba(255, 255, 255, 0.5);
    }

    .line-item.current {
      background: white !important;
      border-color: #e2e8f0 !important;
      box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.08) !important;
      border-left: 4px solid var(--primary-solid) !important;
      transform: scale(1.01);
    }

    .line-item .line-text {
      font-size: 1.05rem !important;
      line-height: 1.6 !important;
      color: var(--text-main) !important;
    }

    .line-item .line-translation {
      color: var(--text-muted) !important;
      font-size: 0.9rem !important;
      margin-top: 4px;
    }

    /* --- Layout Tweaks --- */
    .practice-grid {
      display: grid !important;
      grid-template-columns: 1.8fr 1fr !important;
      /* ~64% video, ~36% text */
      height: calc(100vh - 80px) !important;
      /* Adjust for header/banner */
      grid-template-rows: 100% !important;
      gap: 32px !important;
      padding: 0 2rem 2rem !important;
      max-width: 1600px;
      margin: 0 auto;
    }

    .practice-left {
      display: flex;
      flex-direction: column;
      gap: 16px;
      overflow-y: auto;
      padding-right: 4px;
      /* Space for scrollbar */
      scrollbar-width: none;
    }

    .practice-right {
      height: 100%;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .lines-card {
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .lines-container {
      flex: 1;
      overflow-y: auto;
    }

    /* Recording Controls */
    .global-record-btn {
      background: #fff1f2 !important;
      border-color: #f43f5e !important;
      color: #e11d48 !important;
      border-radius: 14px !important;
    }

    .global-record-btn:hover {
      background: #ffe4e6 !important;
    }

    /* Scrollbars for cards */
    .card {
      scrollbar-width: none;
      /* Clean look */
    }

    /* Tooltip Polish */
    [data-tooltip]::after {
      background: rgba(15, 23, 42, 0.95) !important;
      backdrop-filter: blur(4px);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2) !important;
      padding: 8px 12px !important;
      border-radius: 8px !important;
      font-size: 13px !important;
    }

    /* =====================================================
       Pronunciation Feedback Modal
       ===================================================== */
    .pronunciation-feedback-overlay {
      position: fixed;
      inset: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 2000;
      background: rgba(15, 23, 42, 0.5);
      backdrop-filter: blur(4px);
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.25s ease, visibility 0.25s ease;
    }

    .pronunciation-feedback-overlay.visible {
      opacity: 1;
      visibility: visible;
    }

    .pronunciation-feedback-overlay.closing {
      opacity: 0;
    }

    .pronunciation-feedback-card {
      width: min(480px, 90vw);
      max-height: 85vh;
      background: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
      border-radius: 20px;
      padding: 24px;
      box-shadow: 0 20px 60px rgba(15, 23, 42, 0.25), 0 0 0 1px rgba(255, 255, 255, 0.1);
      transform: translateY(20px) scale(0.95);
      transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
      overflow-y: auto;
    }

    .pronunciation-feedback-overlay.visible .pronunciation-feedback-card {
      transform: translateY(0) scale(1);
    }

    .pronunciation-feedback-overlay.closing .pronunciation-feedback-card {
      transform: translateY(-20px) scale(0.95);
    }

    .feedback-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 20px;
    }

    .feedback-emoji {
      font-size: 2rem;
    }

    .feedback-title {
      font-size: 1.5rem;
      font-weight: 700;
      color: #1e293b;
    }

    .feedback-score-section {
      display: flex;
      justify-content: center;
      margin-bottom: 24px;
    }

    .feedback-score-breakdown {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
      margin: 0 0 20px;
    }

    .score-metric {
      background: rgba(15, 23, 42, 0.04);
      border: 1px solid rgba(148, 163, 184, 0.3);
      border-radius: 12px;
      padding: 10px 12px;
      text-align: center;
    }

    .score-metric .metric-label {
      font-size: 11px;
      color: #6b7280;
      margin-bottom: 4px;
    }

    .score-metric .metric-value {
      font-size: 18px;
      font-weight: 800;
      color: #111827;
    }

    .feedback-compare {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      margin-top: 0.8rem;
      flex-wrap: wrap;
    }

    .feedback-compare-btn {
      border-radius: 999px;
      border: 1px solid rgba(99, 102, 241, 0.35);
      background: rgba(99, 102, 241, 0.12);
      color: #0f5e52;
      padding: 6px 14px;
      font-size: 12px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .feedback-compare-btn:hover {
      background: rgba(99, 102, 241, 0.2);
      border-color: rgba(99, 102, 241, 0.5);
    }

    .score-circle {
      width: 100px;
      height: 100px;
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
      transition: all 0.3s ease;
    }

    .score-circle.excellent {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: white;
    }

    .score-circle.good {
      background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
      color: white;
    }

    .score-circle.fair {
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: white;
    }

    .score-circle.poor {
      background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
      color: white;
    }

    .score-label {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1;
    }

    .score-percent {
      font-size: 0.9rem;
      opacity: 0.9;
      margin-top: 4px;
    }

    .feedback-text-section {
      background: #f8fafc;
      border-radius: 12px;
      padding: 16px;
      margin-bottom: 16px;
      border: 1px solid #e2e8f0;
    }

    .text-label {
      font-size: 0.75rem;
      font-weight: 600;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 8px;
    }

    .highlighted-text {
      font-size: 1.1rem;
      line-height: 1.8;
      color: #334155;
      word-wrap: break-word;
    }

    .hypothesis-text {
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px dashed #e2e8f0;
      font-size: 0.9rem;
      color: #64748b;
      font-style: italic;
    }

    /* Word highlighting styles */
    .word-correct {
      color: #10b981;
      font-weight: 600;
    }

    .word-missing {
      color: #ef4444;
      text-decoration: line-through;
      font-weight: 600;
      opacity: 0.8;
    }

    .word-extra {
      color: #f59e0b;
      font-weight: 600;
      background: rgba(245, 158, 11, 0.1);
      padding: 0 4px;
      border-radius: 4px;
    }

    .word-neutral {
      color: #64748b;
    }

    .feedback-tip {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
      border-radius: 12px;
      padding: 14px 16px;
      margin-bottom: 16px;
      border: 1px solid #fbbf24;
    }

    .tip-icon {
      font-size: 1.2rem;
      flex-shrink: 0;
    }

    .tip-text {
      font-size: 0.95rem;
      color: #92400e;
      line-height: 1.5;
    }

    .feedback-legend {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 20px;
      flex-wrap: wrap;
    }

    .legend-item {
      font-size: 0.8rem;
      color: #64748b;
      display: flex;
      align-items: center;
      gap: 6px;
    }

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

    .feedback-btn {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 20px;
      border: none;
      border-radius: 12px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .feedback-btn .btn-icon {
      font-size: 1.2rem;
    }

    .retry-btn {
      background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
      color: white;
      box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
    }

    .retry-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
    }

    .retry-btn:active {
      transform: translateY(0);
    }

    .next-btn {
      background: #f1f5f9;
      color: #475569;
      border: 1px solid #e2e8f0;
    }

    .next-btn:hover {
      background: #e2e8f0;
      transform: translateY(-2px);
    }

    .next-btn:active {
      transform: translateY(0);
    }

    /* Mobile responsive */
    @media (max-width: 640px) {
      .pronunciation-feedback-overlay {
        align-items: flex-end;
      }

      .pronunciation-feedback-card {
        width: 100%;
        max-height: 80vh;
        border-radius: 20px 20px 0 0;
        padding: 20px;
        transform: translateY(100%);
      }

      .pronunciation-feedback-overlay.visible .pronunciation-feedback-card {
        transform: translateY(0);
      }

      .pronunciation-feedback-overlay.closing .pronunciation-feedback-card {
        transform: translateY(100%);
      }

      .feedback-actions {
        flex-direction: column;
      }
    }

    .practice-guide-overlay {
      position: fixed;
      inset: 0;
      background: rgba(15, 23, 42, 0.65);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 9999;
    }

    .practice-guide-overlay[hidden] {
      display: none;
    }

    .guide-spotlight {
      position: absolute;
      border-radius: 999px;
      border: 2px solid rgba(251, 191, 36, 0.9);
      box-shadow: 0 0 0 200vmax rgba(15, 23, 42, 0.65);
      transition: all 0.2s ease;
    }

    .guide-bubble {
      position: absolute;
      background: white;
      padding: 14px 18px;
      border-radius: 14px;
      box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
      display: flex;
      flex-direction: column;
      gap: 8px;
      min-width: 200px;
      animation: guideFloat 2.4s ease-in-out infinite;
    }

    .guide-title {
      font-size: 14px;
      font-weight: 700;
      color: #111827;
    }

    .guide-text {
      font-size: 12px;
      color: #6b7280;
    }

    .guide-btn {
      align-self: flex-start;
      padding: 6px 12px;
      border-radius: 999px;
      border: none;
      background: linear-gradient(135deg, #0f766e, #f97316);
      color: white;
      font-size: 12px;
      font-weight: 700;
      cursor: pointer;
    }

    @keyframes guideFloat {
      0%,
      100% {
        transform: translateY(0);
      }
      50% {
        transform: translateY(-6px);
      }
    }