:root{--bg-primary: #e0e5ec;--bg-secondary: #e8ecf1;--shadow-light: #ffffff;--shadow-dark: #a3b1c6;--primary: #6366f1;--primary-light: #818cf8;--primary-dark: #4f46e5;--text-primary: #2d3748;--text-secondary: #718096;--text-muted: #a0aec0;--shadow-convex: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);--shadow-concave: inset 4px 4px 8px var(--shadow-dark), inset -4px -4px 8px var(--shadow-light);--shadow-small: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);--shadow-small-concave: inset 2px 2px 4px var(--shadow-dark), inset -2px -2px 4px var(--shadow-light);--sidebar-width: 280px;--header-height: 70px;--player-height: 100px;--sat: env(safe-area-inset-top, 0px);--sab: env(safe-area-inset-bottom, 0px);--sal: env(safe-area-inset-left, 0px);--sar: env(safe-area-inset-right, 0px);--transition-fast: .15s ease;--transition-normal: .25s ease}[data-theme=dark]{--bg-primary: #1a1a2e;--bg-secondary: #16213e;--shadow-light: rgba(255, 255, 255, .05);--shadow-dark: rgba(0, 0, 0, .5);--primary: #818cf8;--primary-light: #a5b4fc;--primary-dark: #6366f1;--text-primary: #e2e8f0;--text-secondary: #94a3b8;--text-muted: #64748b;--shadow-convex: 4px 4px 8px rgba(0, 0, 0, .4), -2px -2px 6px rgba(255, 255, 255, .03);--shadow-concave: inset 2px 2px 4px rgba(0, 0, 0, .4), inset -2px -2px 4px rgba(255, 255, 255, .03);--shadow-small: 2px 2px 4px rgba(0, 0, 0, .4), -1px -1px 3px rgba(255, 255, 255, .03);--shadow-small-concave: inset 1px 1px 2px rgba(0, 0, 0, .4), inset -1px -1px 2px rgba(255, 255, 255, .03)}[data-theme=dark] body,[data-theme=dark] .login-card,[data-theme=dark] .settings-panel,[data-theme=dark] .vocab-drawer-panel,[data-theme=dark] .word-popup{background-color:var(--bg-primary);color:var(--text-primary)}[data-theme=dark] .word-popup{background:var(--bg-primary)}[data-theme=dark] .word-popup-save-btn{background:var(--bg-secondary);border-color:var(--text-muted);color:var(--text-secondary)}[data-theme=dark] .word-popup-save-btn.saved{background:var(--primary);border-color:var(--primary);color:#fff}[data-theme=dark] input,[data-theme=dark] select,[data-theme=dark] textarea{background-color:var(--bg-secondary);color:var(--text-primary);border-color:var(--text-muted)}[data-theme=dark] input::placeholder{color:var(--text-muted)}[data-theme=dark] .quiz-option{background:var(--bg-secondary);border-color:var(--bg-primary)}[data-theme=dark] .quiz-option:hover:not(:disabled){border-color:var(--primary)}[data-theme=dark] .quiz-wrong-answers{background:var(--bg-secondary)}[data-theme=dark] .quiz-wrong-answers li{border-bottom-color:var(--bg-primary)}[data-theme=dark] .vocab-item{background:var(--bg-secondary)}[data-theme=dark] .vocab-search-input{background:var(--bg-secondary);color:var(--text-primary);border-color:var(--text-muted)}[data-theme=dark] .policy-modal,[data-theme=dark] .relogin-modal{background-color:var(--bg-primary)}[data-theme=dark] .policy-modal-header{border-bottom-color:var(--bg-secondary)}[data-theme=dark] .subtitle-overlay{background:#2d3748}[data-theme=dark] .subtitle-cue.active{background-color:#0006}[data-theme=dark] .control-button{background-color:#2d3748;border:1px solid #4a5568;box-shadow:2px 2px 6px #00000080,-1px -1px 4px #ffffff0d}[data-theme=dark] .control-button:hover:not(:disabled){background-color:#3d4a5c;border-color:var(--primary)}[data-theme=dark] .control-button:active:not(:disabled){background-color:#1e2633;box-shadow:inset 2px 2px 4px #00000080}[data-theme=dark] .control-button.small.active{background-color:#3d4a5c;border-color:var(--primary);color:var(--primary)}[data-theme=dark] .control-button.subtitle-btn.has-subtitle:hover:not(:disabled){background-color:#3d4a5c;border-color:var(--primary);color:var(--primary)}[data-theme=dark] .control-button.play-button{background:linear-gradient(145deg,#4a5568,#5a6a7a);border:2px solid #718096;box-shadow:0 4px 12px #0006}[data-theme=dark] .control-button.play-button:hover:not(:disabled){background:linear-gradient(145deg,#5a6a7a,#6b7a8a);border-color:#a0aec0}[data-theme=dark] .control-button.play-button:active:not(:disabled){box-shadow:inset 2px 2px 4px #0006}[data-theme=dark] .progress-track{background-color:#2d3748;border:1px solid #4a5568;box-shadow:inset 2px 2px 4px #0006}[data-theme=dark] .progress-fill{background:linear-gradient(90deg,#a0aec0,#e2e8f0)}[data-theme=dark] .progress-thumb{background-color:#e2e8f0;border:2px solid #718096;box-shadow:0 2px 6px #0006}[data-theme=dark] .volume-track{background-color:#2d3748;border:1px solid #4a5568}[data-theme=dark] .volume-fill{background:linear-gradient(90deg,#a0aec0,#e2e8f0)}[data-theme=dark] .volume-thumb{background-color:#e2e8f0;border:2px solid #718096}[data-theme=dark] .sentence-repeat-fab{background-color:#2d3748;border:1px solid #4a5568;box-shadow:2px 2px 8px #00000080}[data-theme=dark] .sentence-repeat-fab.active{background:linear-gradient(135deg,#4a5568,#5a6a7a);border-color:#718096}[data-theme=dark] .settings-slider{background:#2d3748;border:1px solid #4a5568}[data-theme=dark] .settings-toggle{background-color:#2d3748;border:1px solid #4a5568}[data-theme=dark] .settings-font-btn,[data-theme=dark] .settings-repeat-btn{background-color:#2d3748;border:1px solid #4a5568;box-shadow:2px 2px 4px #0006}[data-theme=dark] .settings-font-btn:active:not(:disabled),[data-theme=dark] .settings-repeat-btn:active{background-color:#1e2633}[data-theme=dark] .fullscreen-close,[data-theme=dark] .fullscreen-settings-btn,[data-theme=dark] .fullscreen-vocab-btn,[data-theme=dark] .fullscreen-language-btn{background-color:#2d3748;border:1px solid #4a5568}[data-theme=dark] .fullscreen-close:hover,[data-theme=dark] .fullscreen-settings-btn:hover,[data-theme=dark] .fullscreen-vocab-btn:hover,[data-theme=dark] .fullscreen-language-btn:hover{background-color:#3d4a5c;border-color:var(--primary)}[data-theme=dark] .player{background-color:#1e2633;border-top:1px solid #2d3748}[data-theme=dark] .track-artwork{border:1px solid #4a5568}[data-theme=dark] .playlist-card,[data-theme=dark] .track-item{background-color:#2d3748;border:1px solid #3d4a5c}[data-theme=dark] .playlist-card:hover,[data-theme=dark] .track-item:hover{border-color:var(--primary)}[data-theme=dark] .playlist-card.active,[data-theme=dark] .track-item.active{background-color:#1e2633;border-color:var(--primary)}[data-theme=dark] .playlist-icon{background-color:#1e2633;border:1px solid #4a5568}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,-apple-system,BlinkMacSystemFont,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;overflow:hidden}.app{display:flex;flex-direction:column;height:100vh;background-color:var(--bg-primary)}.main-content{display:flex;flex:1;overflow:hidden}.header{height:var(--header-height);display:flex;align-items:center;justify-content:space-between;padding:0 24px;background-color:var(--bg-primary);box-shadow:0 4px 12px var(--shadow-dark);z-index:100}.header-logo{display:flex;align-items:center;gap:12px;font-size:1.25rem;font-weight:600;color:var(--primary)}.header-user{display:flex;align-items:center;gap:12px}.user-avatar{width:36px;height:36px;border-radius:50%;box-shadow:var(--shadow-small)}.user-avatar.user-avatar-placeholder{display:flex;align-items:center;justify-content:center;background-color:var(--bg-secondary);color:var(--text-secondary)}.user-name{font-size:.9rem;color:var(--text-secondary)}.logout-button{width:36px;height:36px;border:none;border-radius:10px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:var(--transition-fast)}.logout-button:hover{color:var(--primary)}.logout-button:active{box-shadow:var(--shadow-small-concave)}.folder-change-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;border:none;border-radius:10px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;color:var(--text-secondary);font-size:13px;font-weight:500;transition:var(--transition-fast);max-width:160px}.folder-change-btn:hover:not(:disabled){color:var(--primary)}.folder-change-btn:active:not(:disabled){box-shadow:var(--shadow-small-concave)}.folder-change-btn:disabled{opacity:.7;cursor:not-allowed}.folder-change-btn.loading svg{animation:spin 1s linear infinite}.folder-change-btn .folder-name-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100px}.sidebar{width:var(--sidebar-width);height:calc(100vh - var(--header-height) - var(--player-height));background-color:var(--bg-primary);border-right:1px solid rgba(163,177,198,.2);overflow-y:auto;padding:20px}.sidebar::-webkit-scrollbar{width:6px}.sidebar::-webkit-scrollbar-track{background:transparent}.sidebar::-webkit-scrollbar-thumb{background:var(--shadow-dark);border-radius:3px}.playlist-list{display:flex;flex-direction:column;gap:16px}.playlist-list.loading-state,.playlist-list.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:200px;text-align:center;color:var(--text-secondary);gap:12px}.playlist-list .hint{font-size:.8rem;color:var(--text-muted)}.playlist-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.playlist-header h2{font-size:1rem;font-weight:600;color:var(--text-primary)}.icon-button{width:32px;height:32px;border:none;border-radius:8px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:var(--transition-fast)}.icon-button:hover{color:var(--primary)}.icon-button:active{box-shadow:var(--shadow-small-concave)}.playlist-items{display:flex;flex-direction:column;gap:12px}.playlist-card{display:flex;align-items:center;gap:12px;padding:14px;border-radius:14px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;transition:var(--transition-normal)}.playlist-card:hover{transform:translateY(-2px)}.playlist-card:active,.playlist-card.active{box-shadow:var(--shadow-small-concave)}.playlist-card.active{background:linear-gradient(145deg,var(--bg-secondary),var(--bg-primary))}.playlist-card.active .playlist-icon{background:linear-gradient(145deg,var(--primary),var(--primary-light));color:#fff;box-shadow:none}.playlist-icon{width:44px;height:44px;border-radius:12px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);display:flex;align-items:center;justify-content:center;color:var(--primary);flex-shrink:0}.playlist-info{flex:1;min-width:0}.playlist-name{font-size:.9rem;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.playlist-count{display:flex;align-items:center;gap:4px;font-size:.75rem;color:var(--text-muted);margin-top:4px}.track-list{flex:1;height:calc(100vh - var(--header-height) - var(--player-height));overflow-y:auto;padding:24px}.track-list::-webkit-scrollbar{width:8px}.track-list::-webkit-scrollbar-track{background:transparent}.track-list::-webkit-scrollbar-thumb{background:var(--shadow-dark);border-radius:4px}.track-list.loading-state,.track-list.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-secondary);gap:16px}.track-list-header{display:flex;align-items:center;gap:16px;margin-bottom:24px}.track-list-header h2{font-size:1.5rem;font-weight:600;color:var(--text-primary)}.track-count{font-size:.9rem;color:var(--text-muted);padding:4px 12px;border-radius:20px;background-color:var(--bg-primary);box-shadow:var(--shadow-small-concave)}.track-items{display:flex;flex-direction:column;gap:8px}.track-item{display:flex;align-items:center;gap:16px;padding:12px 16px;border-radius:12px;background-color:var(--bg-primary);cursor:pointer;transition:var(--transition-normal)}.track-item:hover{box-shadow:var(--shadow-small)}.track-item:hover .track-number span{display:none}.track-item:hover .track-play-icon{display:flex}.track-item.active{background:linear-gradient(145deg,var(--bg-secondary),var(--bg-primary));box-shadow:var(--shadow-small-concave)}.track-item.active .track-number{color:var(--primary)}.track-item.selected{background:linear-gradient(145deg,var(--bg-secondary),var(--bg-primary));box-shadow:var(--shadow-small-concave)}.track-item.selected .track-number,.track-item.selected .track-item-name{color:var(--primary)}.track-item.selected .track-play-icon{animation:pulse 1.5s ease-in-out infinite}.preload-progress-container{display:flex;align-items:center;gap:8px;margin-top:8px}.preload-progress-bar{flex:1;height:5px;background:#00000026;border-radius:3px;overflow:hidden;box-shadow:inset 0 1px 2px #0000001a}.preload-progress-fill{height:100%;width:100%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:3px;transition:transform .2s ease-out;will-change:transform}.preload-progress-text{font-size:.7rem;color:var(--primary);min-width:32px;text-align:right}.track-number{width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:.85rem;color:var(--text-muted);flex-shrink:0}.track-item-info{flex:1;min-width:0}.track-item-name{font-size:.95rem;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.track-item-size{font-size:.75rem;color:var(--text-muted);margin-top:2px}.track-play-icon{display:none;width:40px;height:40px;align-items:center;justify-content:center;color:var(--primary);border-radius:50%;transition:var(--transition-fast)}.track-play-icon.visible{display:flex;background:var(--primary);color:#fff;box-shadow:var(--shadow-small)}.track-play-icon.visible:active{transform:scale(.95)}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.7;transform:scale(1.05)}}.player{height:var(--player-height);display:flex;align-items:center;justify-content:space-between;padding:0 24px;background-color:var(--bg-primary);box-shadow:0 -4px 12px var(--shadow-dark);z-index:100}.track-info{display:flex;align-items:center;gap:16px;width:250px}.track-artwork{width:56px;height:56px;border-radius:12px;background:linear-gradient(145deg,var(--primary),var(--primary-light));box-shadow:var(--shadow-small);display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}.track-details{flex:1;min-width:0}.track-name{font-size:.95rem;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.track-playlist{font-size:.8rem;color:var(--text-muted);margin-top:2px}.player-center{display:flex;flex-direction:column;align-items:center;gap:12px;flex:1;max-width:600px}.controls{display:flex;align-items:center;gap:16px}.control-button{width:44px;height:44px;border:none;border-radius:50%;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:var(--transition-fast)}.control-button:hover:not(:disabled){color:var(--primary)}.control-button:active:not(:disabled){box-shadow:var(--shadow-small-concave)}.control-button:disabled{opacity:.5;cursor:not-allowed}.control-button.small{width:36px;height:36px}.control-button.small.active{color:var(--primary);box-shadow:var(--shadow-small-concave)}.control-button.subtitle-btn{margin-left:12px;opacity:.4;cursor:not-allowed}.control-button.subtitle-btn.has-subtitle{opacity:1;cursor:pointer}.control-button.subtitle-btn.has-subtitle:hover:not(:disabled){color:var(--primary)}.control-button.play-button{width:56px;height:56px;background:linear-gradient(145deg,var(--primary),var(--primary-light));color:#fff;box-shadow:4px 4px 12px var(--shadow-dark),-4px -4px 12px #ffffff80}.control-button.play-button:hover:not(:disabled){background:linear-gradient(145deg,var(--primary-light),var(--primary));color:#fff}.control-button.play-button:active:not(:disabled){box-shadow:inset 2px 2px 6px var(--primary-dark),inset -2px -2px 6px var(--primary-light)}.progress-container{display:flex;align-items:center;gap:12px;width:100%}.progress-container .time{font-size:.75rem;color:var(--text-muted);width:40px;text-align:center}.progress-bar{flex:1;height:20px;display:flex;align-items:center;cursor:pointer}.progress-track{width:100%;height:6px;border-radius:3px;background-color:var(--bg-primary);box-shadow:var(--shadow-small-concave);position:relative;overflow:visible}.progress-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--primary),var(--primary-light));position:relative;transition:width .1s linear}.progress-thumb{position:absolute;right:-6px;top:50%;transform:translateY(-50%);width:12px;height:12px;border-radius:50%;background-color:#fff;box-shadow:var(--shadow-small);opacity:0;transition:var(--transition-fast)}.progress-bar:hover .progress-thumb{opacity:1}.player-right{display:flex;align-items:center;gap:16px}.speed-control{position:relative}.speed-button{display:flex;align-items:center;gap:6px;padding:8px 12px;border:none;border-radius:10px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;color:var(--text-secondary);font-size:.85rem;font-weight:500;transition:var(--transition-fast)}.speed-button:hover{color:var(--primary)}.speed-button:active{box-shadow:var(--shadow-small-concave)}.speed-label{min-width:28px;text-align:center}.speed-dropdown{position:absolute;bottom:100%;left:50%;transform:translate(-50%);margin-bottom:8px;padding:8px;background-color:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-convex);display:flex;flex-direction:column;gap:4px;z-index:100}.speed-option{padding:8px 16px;border:none;border-radius:8px;background-color:transparent;color:var(--text-secondary);font-size:.85rem;cursor:pointer;transition:var(--transition-fast);white-space:nowrap}.speed-option:hover{background-color:var(--bg-secondary);color:var(--text-primary)}.speed-option.active{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;box-shadow:var(--shadow-small)}.volume-container{display:flex;align-items:center;gap:12px;width:150px}.volume-button{width:36px;height:36px;border:none;border-radius:10px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:var(--transition-fast);flex-shrink:0}.volume-button:hover{color:var(--primary)}.volume-button:active{box-shadow:var(--shadow-small-concave)}.volume-slider{flex:1;height:20px;display:flex;align-items:center;cursor:pointer}.volume-track{width:100%;height:4px;border-radius:2px;background-color:var(--bg-primary);box-shadow:var(--shadow-small-concave);position:relative}.volume-fill{height:100%;border-radius:2px;background:linear-gradient(90deg,var(--primary),var(--primary-light));position:relative}.volume-thumb{position:absolute;right:-5px;top:50%;transform:translateY(-50%);width:10px;height:10px;border-radius:50%;background-color:#fff;box-shadow:var(--shadow-small)}.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh;min-height:100dvh;background-color:var(--bg-primary);padding:20px;padding-top:calc(env(safe-area-inset-top,0px) + 20px);padding-bottom:calc(env(safe-area-inset-bottom,0px) + 20px);padding-left:calc(env(safe-area-inset-left,0px) + 20px);padding-right:calc(env(safe-area-inset-right,0px) + 20px);box-sizing:border-box}.login-card{display:flex;flex-direction:column;align-items:center;padding:48px;border-radius:24px;background-color:var(--bg-primary);box-shadow:var(--shadow-convex);text-align:center;max-width:400px}.login-icon{width:100px;height:100px;border-radius:50%;background:linear-gradient(145deg,var(--primary),var(--primary-light));box-shadow:var(--shadow-small);display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:24px}.login-card h1{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:12px}.login-card p{font-size:.9rem;color:var(--text-secondary);margin-bottom:32px}.login-form{width:100%;display:flex;flex-direction:column;gap:12px;margin-bottom:8px}.login-input{width:100%;padding:12px 16px;border-radius:12px;border:1px solid var(--bg-secondary);background-color:var(--bg-primary);color:var(--text-primary);box-shadow:var(--shadow-small-concave)}.login-input::placeholder{color:var(--text-muted)}.login-error{font-size:.85rem;color:#e53e3e}.login-button{display:flex;align-items:center;justify-content:center;gap:12px;width:100%;padding:14px 28px;border:none;border-radius:14px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;font-size:1rem;font-weight:500;color:var(--text-primary);transition:var(--transition-normal)}.login-button:hover{transform:translateY(-2px);color:var(--primary)}.login-button:active{transform:translateY(0);box-shadow:var(--shadow-small-concave)}.login-info{margin-top:24px}.login-info p{font-size:.75rem;color:var(--text-muted);margin-bottom:0}.refresh-button{display:flex;align-items:center;gap:8px;padding:10px 20px;border:none;border-radius:10px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);cursor:pointer;font-size:.85rem;color:var(--text-secondary);transition:var(--transition-fast);margin-top:16px}.refresh-button:hover{color:var(--primary)}.refresh-button:active{box-shadow:var(--shadow-small-concave)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.spinner{animation:spin 1s linear infinite}.login-footer{margin-top:24px;display:flex;align-items:center;justify-content:center;gap:12px}.policy-link{background:none;border:none;color:var(--text-muted);font-size:.8rem;cursor:pointer;padding:4px 8px;border-radius:4px;transition:var(--transition-fast)}.policy-link:hover{color:var(--primary);background-color:#6366f11a}.policy-divider{color:var(--text-muted);font-size:.8rem}.policy-modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.policy-modal{background-color:var(--bg-primary);border-radius:20px;box-shadow:var(--shadow-convex);max-width:600px;width:100%;max-height:80vh;display:flex;flex-direction:column;overflow:hidden}.policy-modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--shadow-light)}.policy-modal-header h2{margin:0;font-size:1.25rem;color:var(--text-primary)}.policy-modal-close{width:40px;height:40px;border:none;border-radius:50%;background-color:var(--bg-primary);box-shadow:var(--shadow-small);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);cursor:pointer;transition:var(--transition-fast)}.policy-modal-close:hover{color:var(--primary)}.policy-modal-close:active{box-shadow:var(--shadow-small-concave)}.policy-modal-content{padding:24px;overflow-y:auto;flex:1}.policy-text{color:var(--text-secondary);font-size:.9rem;line-height:1.7}.policy-text .policy-date{color:var(--text-muted);font-size:.8rem;margin-bottom:20px}.policy-text h3{color:var(--text-primary);font-size:1rem;margin:24px 0 12px}.policy-text h3:first-of-type{margin-top:0}.policy-text p{margin:0 0 12px}.policy-text ul{margin:0 0 12px;padding-left:20px}.policy-text li{margin-bottom:6px}.policy-text a{color:var(--primary);text-decoration:none}.policy-text a:hover{text-decoration:underline}.relogin-modal-overlay{position:fixed;inset:0;background-color:#0009;display:flex;align-items:center;justify-content:center;z-index:2000;padding:20px}.relogin-modal{background-color:var(--bg-primary);border-radius:24px;box-shadow:var(--shadow-convex);padding:32px;max-width:360px;width:100%;text-align:center}.relogin-icon{width:80px;height:80px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#fff}.relogin-modal h2{font-size:1.25rem;color:var(--text-primary);margin:0 0 8px}.relogin-modal p{font-size:.9rem;color:var(--text-secondary);margin:0 0 24px}.relogin-button{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px 24px;margin-bottom:12px;border:none;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--primary-light));box-shadow:var(--shadow-small);font-size:1rem;font-weight:600;color:#fff;cursor:pointer;transition:var(--transition-fast)}.relogin-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #6366f166}.relogin-button:active{transform:translateY(0)}.relogin-cancel{padding:10px 20px;border:none;border-radius:8px;background:transparent;font-size:.9rem;color:var(--text-muted);cursor:pointer;transition:var(--transition-fast)}.relogin-cancel:hover{color:var(--text-secondary)}.guide-button{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px 24px;margin-bottom:12px;border:none;border-radius:12px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);font-size:1rem;font-weight:500;color:var(--primary);cursor:pointer;transition:var(--transition-fast)}.guide-button:hover{box-shadow:var(--shadow-convex)}.guide-button:active{box-shadow:var(--shadow-small-concave)}.user-guide .guide-intro{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;padding:16px 20px;border-radius:12px;margin-bottom:24px}.user-guide .guide-intro p{margin:0;line-height:1.6}.user-guide .guide-image{display:flex;justify-content:center;margin:16px 0}.user-guide .folder-diagram{width:100%;max-width:300px;height:auto}.user-guide code{background-color:#6366f11a;color:var(--primary);padding:2px 6px;border-radius:4px;font-size:.85em;font-family:Consolas,Monaco,monospace}.user-guide .guide-tip{background-color:#10b9811a;border-left:4px solid #10b981;padding:12px 16px;border-radius:0 8px 8px 0;margin:20px 0;color:var(--text-secondary)}.user-guide .guide-tip strong{color:#10b981}.user-guide .guide-structure{background-color:#1e293b;border-radius:12px;padding:16px 20px;overflow-x:auto}.user-guide .guide-structure code{background:none;color:#e2e8f0;font-size:.85rem;line-height:1.8;display:block}.policy-page{min-height:100vh;min-height:100dvh;background-color:var(--bg-primary);padding:24px;padding-top:calc(env(safe-area-inset-top,0px) + 24px);padding-bottom:calc(env(safe-area-inset-bottom,0px) + 24px);padding-left:calc(env(safe-area-inset-left,0px) + 24px);padding-right:calc(env(safe-area-inset-right,0px) + 24px);overflow-y:auto;box-sizing:border-box}.policy-page-header{max-width:800px;margin:0 auto 24px;display:flex;align-items:center;gap:16px}.policy-page-header h1{font-size:1.5rem;color:var(--text-primary);margin:0}.policy-back-button{display:flex;align-items:center;gap:8px;padding:10px 16px;background-color:var(--bg-primary);border:none;border-radius:12px;color:var(--text-secondary);font-size:.9rem;cursor:pointer;box-shadow:var(--shadow-small);transition:var(--transition-fast)}.policy-back-button:hover{color:var(--primary);box-shadow:var(--shadow-convex)}.policy-back-button:active{box-shadow:var(--shadow-small-concave)}.policy-page-content{max-width:800px;margin:0 auto;padding:32px;background-color:var(--bg-primary);border-radius:24px;box-shadow:var(--shadow-convex)}.fullscreen-player{position:fixed;top:0;left:0;width:100%;height:100vh;height:100dvh;background:var(--bg-primary);z-index:1000;display:flex;flex-direction:column;transform:translateY(100%);transition:transform .3s ease;overflow:hidden;box-sizing:border-box}.fullscreen-player.open{transform:translateY(0)}.fullscreen-header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;flex-shrink:0}.fullscreen-close{background:var(--bg-secondary);border:none;border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-primary);box-shadow:var(--shadow-small-convex);transition:all .2s ease}.fullscreen-close:hover{background:var(--bg-primary);box-shadow:var(--shadow-small-concave)}.fullscreen-playlist-name{flex:1;text-align:center;font-size:16px;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:0 16px}.fullscreen-header-actions{display:flex;gap:8px}.fullscreen-settings-btn,.fullscreen-vocab-btn,.fullscreen-language-btn{background:var(--bg-secondary);border:none;border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-secondary);box-shadow:var(--shadow-small-convex);transition:all .2s ease;font-size:12px;font-weight:600}.fullscreen-settings-btn:hover,.fullscreen-vocab-btn:hover,.fullscreen-language-btn:hover{color:var(--primary)}.subtitle-overlay{flex:1;overflow-y:auto;padding:24px 48px;display:flex;flex-direction:column;-webkit-overflow-scrolling:touch}.subtitle-placeholder{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-muted);opacity:.3}.subtitle-full-list{display:flex;flex-direction:column;gap:16px;padding:40vh 0}.subtitle-cue{font-size:var(--subtitle-font-size, 20px);line-height:1.8;color:var(--text-secondary);padding:12px 20px;border-radius:12px;cursor:pointer;transition:all .2s ease;word-break:keep-all;word-wrap:break-word}.subtitle-cue:hover{background:var(--bg-secondary)}.subtitle-cue.active{color:var(--text-primary);background:var(--bg-secondary);font-weight:500;box-shadow:var(--shadow-small-concave)}.subtitle-cue.selected{background:#6366f11a;border:1px solid var(--primary)}.subtitle-cue .sub-word{cursor:pointer;padding:2px 0;border-radius:4px;transition:background-color .15s ease}.subtitle-cue .sub-word:hover{background-color:#6366f133}.fullscreen-progress{padding:16px 48px;flex-shrink:0}.fullscreen-progress .progress-container{display:flex;align-items:center;gap:16px}.fullscreen-progress .progress-bar{flex:1;height:8px;cursor:pointer}.fullscreen-progress .progress-track{height:100%;background:var(--bg-secondary);border-radius:4px;overflow:hidden;box-shadow:var(--shadow-small-concave)}.fullscreen-progress .progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:4px;position:relative}.fullscreen-progress .progress-thumb{position:absolute;right:-8px;top:50%;transform:translateY(-50%);width:16px;height:16px;background:#fff;border-radius:50%;box-shadow:0 2px 8px #0003}.fullscreen-progress .time{font-size:13px;color:var(--text-secondary);min-width:50px;text-align:center}.fullscreen-controls{display:flex;align-items:center;justify-content:center;gap:24px;padding:24px;flex-shrink:0}.fullscreen-controls .control-button{width:56px;height:56px}.fullscreen-controls .control-button.small{width:44px;height:44px}.fullscreen-controls .control-button.play-button{width:72px;height:72px}.sentence-repeat-fab{position:fixed;bottom:140px;right:32px;width:56px;height:56px;border-radius:50%;background:var(--bg-secondary);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-secondary);box-shadow:var(--shadow-convex);transition:all .2s ease;z-index:1001}.sentence-repeat-fab:hover{color:var(--primary)}.sentence-repeat-fab.active{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff}.sentence-repeat-fab .repeat-counter{position:absolute;top:-4px;right:-4px;background:var(--primary);color:#fff;font-size:10px;padding:2px 6px;border-radius:10px;font-weight:600}.settings-panel-overlay{position:fixed;inset:0;background:#00000080;z-index:1002;display:flex;align-items:center;justify-content:center}.settings-panel{background:var(--bg-primary);border-radius:16px;width:90%;max-width:400px;max-height:80vh;overflow-y:auto;box-shadow:0 20px 60px #0000004d}.settings-panel-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--bg-secondary)}.settings-panel-header h3{margin:0;font-size:18px;font-weight:600}.settings-close-btn{background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:8px;border-radius:8px;transition:all .2s ease}.settings-close-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.settings-panel-content{padding:20px;display:flex;flex-direction:column;gap:24px}.language-panel{width:90%;max-width:300px}.language-panel .settings-panel-content{gap:12px}.settings-item{display:flex;flex-direction:column;gap:12px}.settings-label{font-size:14px;font-weight:600;color:var(--text-primary)}.settings-speed-slider{display:flex;flex-direction:column;gap:8px}.settings-speed-value{font-size:24px;font-weight:700;color:var(--primary);text-align:center}.settings-slider-container{position:relative;padding:8px 0}.settings-slider{width:100%;height:8px;-webkit-appearance:none;appearance:none;background:var(--bg-secondary);border-radius:4px;outline:none}.settings-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:24px;height:24px;background:var(--primary);border-radius:50%;cursor:pointer;box-shadow:0 2px 8px #6366f166}.settings-slider-ticks{position:absolute;top:50%;left:0;right:0;transform:translateY(-50%);pointer-events:none}.settings-slider-ticks .tick{position:absolute;width:2px;height:12px;background:var(--text-muted);transform:translate(-50%);opacity:.3}.settings-speed-labels{display:flex;justify-content:space-between;font-size:11px;color:var(--text-muted)}.settings-font-control{display:flex;align-items:center;justify-content:center;gap:16px}.settings-font-btn{width:40px;height:40px;border-radius:50%;background:var(--bg-secondary);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-primary);box-shadow:var(--shadow-small-convex);transition:all .2s ease}.settings-font-btn:hover:not(:disabled){color:var(--primary)}.settings-font-btn:disabled{opacity:.4;cursor:not-allowed}.settings-font-value{font-size:20px;font-weight:600;min-width:40px;text-align:center}.settings-repeat-options,.language-options{display:flex;flex-wrap:wrap;gap:8px}.settings-repeat-btn,.language-btn{padding:8px 16px;border-radius:20px;background:var(--bg-secondary);border:1px solid transparent;font-size:13px;cursor:pointer;color:var(--text-secondary);transition:all .2s ease}.settings-repeat-btn:hover,.language-btn:hover{color:var(--text-primary)}.settings-repeat-btn.active,.language-btn.active{background:var(--primary);color:#fff}.settings-toggle-row{display:flex;align-items:center;justify-content:space-between}.settings-toggle-label{display:flex;align-items:center;font-size:14px;color:var(--text-primary)}.settings-toggle{width:48px;height:28px;border-radius:14px;background:var(--bg-secondary);border:none;cursor:pointer;position:relative;transition:background .2s ease}.settings-toggle:after{content:"";position:absolute;top:4px;left:4px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:0 2px 4px #0003;transition:transform .2s ease}.settings-toggle.active{background:var(--primary)}.settings-toggle.active:after{transform:translate(20px)}@media(max-width:768px){:root{--header-height: 56px;--player-height: 72px;--nav-height: 64px}body{overflow:hidden;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.app{height:100dvh;height:var(--app-height, 100vh);padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);padding-left:env(safe-area-inset-left,0px);padding-right:env(safe-area-inset-right,0px);box-sizing:border-box}.main-content{flex-direction:column;position:relative;flex:1;overflow:hidden}.header{height:var(--header-height);padding:0 16px;flex-shrink:0}.header-logo{font-size:1.1rem;gap:8px}.header-logo span{display:none}.header-logo:after{content:"Mementori Caption Player";font-size:1rem}.user-name{display:none}.user-avatar,.logout-button{width:32px;height:32px}.folder-change-btn{padding:4px 8px;font-size:12px;max-width:120px}.folder-change-btn .folder-name-text{max-width:70px}.sidebar{position:absolute;top:0;left:0;width:100%;height:100%;border-right:none;padding:16px;z-index:10;transition:transform .3s ease,opacity .3s 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ease;touch-action:manipulation;-webkit-user-select:none;user-select:none}.track-item:hover{box-shadow:none}.track-item:active{box-shadow:var(--shadow-small-concave);transform:scale(.98);transition:none}.track-number{width:28px;height:28px;font-size:.8rem}.track-item-name{font-size:.9rem}.track-play-icon{display:flex;opacity:.5}.player{height:var(--player-height);padding:8px 16px;flex-direction:row;gap:12px;cursor:pointer;position:relative;flex-shrink:0}.player:before{content:"";position:absolute;top:4px;left:50%;transform:translate(-50%);width:36px;height:4px;background:var(--shadow-dark);border-radius:2px;opacity:.5}.track-info{width:auto;flex:1;gap:12px}.track-artwork{width:48px;height:48px;border-radius:10px}.track-name{font-size:.9rem}.track-playlist{font-size:.75rem}.player-center,.volume-container{display:none}.mobile-controls{display:flex;align-items:center;gap:8px}.mobile-controls .control-button{width:44px;height:44px}.mobile-controls .control-button.play-button{width:48px;height:48px}.bottom-nav{display:flex;height:var(--nav-height);background-color:var(--bg-primary);box-shadow:0 -2px 10px var(--shadow-dark);z-index:100;flex-shrink:0}.nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;border:none;background:none;color:var(--text-muted);font-size:.7rem;cursor:pointer;transition:var(--transition-fast);padding:8px}.nav-item.active{color:var(--primary)}.nav-item svg{width:24px;height:24px}.fullscreen-player{position:fixed;top:0;left:0;width:100%;height:100dvh;height:var(--app-height, 100vh);background-color:var(--bg-primary);z-index:200;display:flex;flex-direction:column;padding:12px 16px;padding-top:calc(env(safe-area-inset-top,0px) + 12px);padding-left:calc(env(safe-area-inset-left,0px) + 16px);padding-right:calc(env(safe-area-inset-right,0px) + 16px);padding-bottom:8px;transform:translateY(100%);transition:transform .3s 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8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.subtitle-overlay{flex:1;width:100%;min-height:0;border-radius:20px;background:linear-gradient(145deg,var(--primary),var(--primary-light));box-shadow:var(--shadow-convex);display:flex;flex-direction:column;color:#fff;position:relative;overflow-y:auto;overflow-x:hidden;padding:12px;margin-bottom:12px;scroll-behavior:smooth;-webkit-overflow-scrolling:touch}.subtitle-overlay::-webkit-scrollbar{width:4px}.subtitle-overlay::-webkit-scrollbar-track{background:#ffffff1a;border-radius:2px}.subtitle-overlay::-webkit-scrollbar-thumb{background:#ffffff4d;border-radius:2px}.subtitle-placeholder{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);opacity:.3}.subtitle-placeholder svg{width:80px;height:80px}.subtitle-full-list{display:flex;flex-direction:column;gap:10px;width:100%;padding:30% 0}.subtitle-cue{color:#fff;font-size:var(--subtitle-font-size, 20px);font-weight:400;text-align:center;line-height:1.5;text-shadow:1px 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.speed-button{display:flex;align-items:center;justify-content:center;min-width:60px;padding:10px 20px;border:none;border-radius:20px;background-color:var(--bg-primary);box-shadow:var(--shadow-small);color:var(--text-secondary);font-size:.9rem;font-weight:500;cursor:pointer}.fullscreen-speed .speed-button:active{box-shadow:var(--shadow-small-concave)}.fullscreen-speed .speed-menu{position:absolute;bottom:100%;left:50%;transform:translate(-50%);margin-bottom:12px;display:flex;flex-wrap:wrap;justify-content:center;gap:6px;padding:10px;background-color:var(--bg-primary);border-radius:16px;box-shadow:var(--shadow-convex);z-index:10;width:calc(100vw - 40px);max-width:320px}.fullscreen-speed .speed-option{padding:8px 12px;border:none;border-radius:10px;background-color:transparent;color:var(--text-secondary);font-size:.8rem;font-weight:500;cursor:pointer;transition:var(--transition-fast);min-width:50px}.fullscreen-speed 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ease}.vocab-action-btn:hover:not(:disabled){color:var(--primary);box-shadow:var(--shadow-small-concave)}.vocab-action-btn:disabled{opacity:.5;cursor:not-allowed}.vocab-action-btn.quiz-btn{background:var(--primary);color:#fff;box-shadow:0 2px 8px #6366f14d}.vocab-action-btn.quiz-btn:hover:not(:disabled){background:var(--primary-hover);color:#fff}.vocab-action-btn.quiz-btn.disabled{background:var(--bg-secondary);color:var(--text-muted);box-shadow:var(--shadow-small)}.vocab-count{padding:4px 16px 8px;font-size:12px;color:var(--text-muted);flex-shrink:0}.vocab-list{flex:1;overflow-y:auto;padding:0 16px 16px;-webkit-overflow-scrolling:touch}.vocab-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;color:var(--text-muted);text-align:center}.vocab-empty svg{margin-bottom:16px;opacity:.5}.vocab-empty p{margin:0 0 8px;font-size:16px;color:var(--text-secondary)}.vocab-empty span{font-size:13px}.vocab-item{display:flex;align-items:flex-start;gap:12px;padding:12px;margin-bottom:8px;background:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-small);transition:all .3s ease}.vocab-item.deleting{opacity:0;transform:translate(-100%)}.vocab-item-content{flex:1;min-width:0}.vocab-item-word{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px;margin-bottom:4px}.vocab-word{font-size:16px;font-weight:600;color:var(--text-primary)}.vocab-phonetic{font-size:12px;color:var(--text-muted);font-style:italic}.vocab-pos{font-size:11px;color:var(--primary);background:#6366f11a;padding:2px 6px;border-radius:4px}.vocab-item-definition{font-size:14px;color:var(--text-primary);line-height:1.4}.vocab-item-example{font-size:12px;color:var(--text-secondary);font-style:italic;margin-top:4px;line-height:1.4}.vocab-delete-btn{background:transparent;border:none;padding:8px;cursor:pointer;color:var(--text-muted);border-radius:8px;transition:all .15s ease;flex-shrink:0}.vocab-delete-btn:hover{color:#f5222d;background:#f5222d1a}@media(max-width:480px){.vocab-drawer{max-height:90vh;border-radius:20px 20px 0 0}.vocab-drawer-actions{flex-direction:column;gap:8px}.vocab-action-buttons{justify-content:space-between}.vocab-action-btn.quiz-btn{flex:1;justify-content:center}}