: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}*{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-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.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-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)}.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)}@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:100vh;height:100dvh;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:"MP3 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 ease}.sidebar.hidden{transform:translate(-100%);opacity:0;pointer-events:none}.track-list-wrapper{position:absolute;top:0;left:0;width:100%;height:100%;z-index:10;transition:transform .3s ease,opacity .3s ease}.track-list-wrapper.hidden{transform:translate(100%);opacity:0;pointer-events:none}.track-list-wrapper .track-list{height:100%;padding:16px}.track-list{position:relative;height:100%}.track-list-header{margin-bottom:16px}.track-list-header h2{font-size:1.25rem}.playlist-card{padding:16px;min-height:64px}.playlist-icon{width:48px;height:48px}.playlist-name{font-size:1rem}.playlist-count{font-size:.8rem}.track-item{padding:14px 16px;min-height:60px;gap:12px;transition:transform .1s ease,box-shadow .1s 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