:root{--font-sans: "Be Vietnam Pro", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-display: "Be Vietnam Pro", sans-serif;--font-handwriting: "Be Vietnam Pro", sans-serif;--font-chinese: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;--font-pinyin: "Be Vietnam Pro", "Inter", "Segoe UI", Roboto, sans-serif;--nav-height: 70px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-xl: 28px;--container-width: 1200px;--transition-fast: .2s ease;--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .6s cubic-bezier(.4, 0, .2, 1)}html{--font-sans: "Be Vietnam Pro", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-display: "Be Vietnam Pro", sans-serif;--font-chinese: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;--font-pinyin: "Be Vietnam Pro", "Inter", "Segoe UI", Roboto, sans-serif;--radius-sm: 12px;--radius-md: 18px;--radius-lg: 26px;--radius-xl: 36px;--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-glass: #ffffff;--border-glass: #e5e7eb;--border-glass-hover: #58cc02;--text-primary: #2b3a4a;--text-secondary: #52657a;--text-muted: #8b9eb0;--accent-primary: #58cc02;--accent-primary-hover: #46a302;--accent-blue: #1cb0f6;--accent-purple: #ce82ff;--accent-amber: #ffc800;--accent-rose: #ff4b4b;--card-bg-front: #ffffff;--card-bg-back: #eef8ff;--success: #58cc02;--success-bg: #e5f9d3;--warning: #ffb100;--warning-bg: #fff5d6;--danger: #ff4b4b;--danger-bg: #ffe5e5;--shadow-sm: 0 3px 0 #e5e7eb;--shadow-md: 0 5px 0 #d1d5db;--shadow-lg: 0 8px 0 #9ca3af;--shadow-glow: 0 6px 20px rgba(88, 204, 2, .25);--btn-3d-green: 0 4px 0 #46a302;--btn-3d-blue: 0 4px 0 #1899d6;--btn-3d-amber: 0 4px 0 #e5b200;--btn-3d-purple: 0 4px 0 #b45be6;--scrollbar-thumb: #cbd5e1;--scrollbar-track: transparent}html.dark{--bg-primary: #0b0f19;--bg-secondary: #1e293b;--bg-card: #1e293b;--bg-glass: #1e293b;--border-glass: #2b4550;--border-glass-hover: #58cc02;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--card-bg-front: #1e293b;--card-bg-back: #1e293b;--shadow-sm: 0 3px 0 rgba(0,0,0,.2);--shadow-md: 0 5px 0 rgba(0,0,0,.3);--shadow-lg: 0 8px 0 rgba(0,0,0,.4);--shadow-glow: 0 6px 25px rgba(88, 204, 2, .35);--scrollbar-thumb: #2b4550;--scrollbar-track: #131f24}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}button,a,input,select,textarea,.btn,.nb-lesson-check-card,.topic-card,.mini-rad-card{font-family:inherit;touch-action:manipulation}html,body{margin:0;padding:0;width:100%;min-height:100vh;overflow-x:hidden;-webkit-overflow-scrolling:touch}body{font-family:var(--font-sans);background:url(/assets/app_bg_night_v3.png) no-repeat center center fixed / cover!important;color:var(--text-primary);line-height:1.6;transition:background .5s ease-in-out,color var(--transition-normal);padding-bottom:80px}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--scrollbar-track)}::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:var(--radius-sm)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}a{color:inherit;text-decoration:none}.glass-panel{background:var(--bg-glass);border:1.5px solid var(--border-glass);box-shadow:var(--shadow-sm);border-radius:var(--radius-lg);transition:all var(--transition-normal)}.glass-panel:hover{border-color:var(--border-glass-hover);box-shadow:var(--shadow-glow);transform:translateY(-2px)}.hsk-badge{display:inline-flex;align-items:center;justify-content:center;padding:4px 10px;border-radius:999px;font-size:.75rem;font-weight:700;color:#fff;letter-spacing:.03em;box-shadow:0 4px 12px #00000026;text-transform:uppercase}.hsk-badge-1{background:var(--hsk-1, linear-gradient(135deg, #10b981, #059669))}.hsk-badge-2{background:var(--hsk-2, linear-gradient(135deg, #06b6d4, #0891b2))}.hsk-badge-3{background:var(--hsk-3, linear-gradient(135deg, #3b82f6, #2563eb))}.hsk-badge-4{background:var(--hsk-4, linear-gradient(135deg, #8b5cf6, #7c3aed))}.hsk-badge-5{background:var(--hsk-5, linear-gradient(135deg, #f59e0b, #d97706))}.hsk-badge-6{background:var(--hsk-6, linear-gradient(135deg, #ef4444, #dc2626))}.navbar{position:sticky;top:0;z-index:100;height:var(--nav-height);background:var(--bg-secondary);border-bottom:1px solid var(--border-glass);box-shadow:var(--shadow-sm);transition:all var(--transition-normal)}.nav-container{max-width:var(--container-width);margin:0 auto;height:100%;display:flex;justify-content:space-between;align-items:center;padding:0 24px}.nav-brand{display:flex;align-items:center;gap:10px;cursor:pointer}.brand-logo-img{height:52px;width:auto;object-fit:contain;transition:transform var(--transition-fast);filter:drop-shadow(0 0 1px rgba(255,255,255,.4))}html.dark .brand-logo-img{filter:drop-shadow(0 0 2px rgba(255,255,255,.8))}.brand-logo-img:hover{transform:scale(1.03)}.nav-links{display:flex;list-style:none;gap:8px;height:100%;align-items:center}.nav-link{font-weight:500;font-size:.95rem;color:var(--text-secondary);padding:10px 16px;border-radius:var(--radius-sm);display:flex;align-items:center;gap:8px;transition:all var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--text-primary);background:#3b82f614}.nav-chevron{font-size:.75rem;transition:transform var(--transition-fast)}.dropdown{position:relative;height:100%;display:flex;align-items:center}.dropdown-menu{position:absolute;top:100%;left:0;background:var(--bg-secondary);border:1px solid var(--border-glass);border-radius:var(--radius-md);box-shadow:var(--shadow-md);min-width:200px;padding:8px;opacity:0;transform:translateY(10px);pointer-events:none;transition:all var(--transition-fast);list-style:none}.dropdown:hover .dropdown-menu{opacity:1;transform:translateY(0);pointer-events:auto}.dropdown:hover .nav-chevron{transform:rotate(180deg)}.dropdown-menu li a{display:block;padding:10px 16px;border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.9rem;font-weight:500;transition:all var(--transition-fast)}.dropdown-menu li a:hover{background:#3b82f614;color:var(--text-primary)}.nav-right{display:flex;align-items:center;gap:16px}.theme-toggle-btn{background:none;border:none;color:var(--text-secondary);font-size:1.25rem;cursor:pointer;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.theme-toggle-btn:hover{background:#ffffff14;color:var(--text-primary);transform:scale(1.05)}.auth-container{display:flex;align-items:center;border-left:1px solid var(--border-glass);padding-left:16px;height:40px}.logged-out-view{display:flex;align-items:center;gap:12px}#demo-login-btn{height:36px;padding:0 12px;font-size:.85rem;border-radius:var(--radius-sm);background-color:var(--bg-secondary);border:1px solid var(--border-glass);color:var(--text-secondary);font-weight:600;display:flex;align-items:center;gap:6px;cursor:pointer;transition:all var(--transition-fast)}#demo-login-btn:hover{background-color:#3b82f614;border-color:var(--text-muted);color:var(--text-primary)}#google-signin-button{height:36px;display:flex;align-items:center}.auth-container.logged-out .logged-in-view,.auth-container.logged-in .logged-out-view{display:none!important}.user-profile{display:flex;align-items:center;gap:12px;cursor:pointer;-webkit-user-select:none;user-select:none}.user-avatar-img{width:40px;height:40px;border-radius:50%;object-fit:cover;border:2px solid var(--accent-blue);box-shadow:var(--shadow-sm)}.user-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem;font-family:var(--font-display)}.user-info{display:flex;flex-direction:column}.user-name{font-size:.9rem;font-weight:600;color:var(--text-primary);white-space:nowrap;max-width:120px;overflow:hidden;text-overflow:ellipsis}.user-role{font-size:.75rem;color:var(--text-muted);white-space:nowrap;max-width:150px;overflow:hidden;text-overflow:ellipsis}.user-dropdown{position:relative;height:100%;display:flex;align-items:center}.profile-chevron{font-size:.75rem;color:var(--text-muted);transition:transform var(--transition-fast)}.profile-dropdown-menu{position:absolute;top:calc(100% + 8px);left:0;right:0;width:100%;background:var(--bg-card, #1e293b);background-color:#1e293bf5;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-glass, rgba(255, 255, 255, .18));border-radius:var(--radius-md, 12px);box-shadow:0 14px 35px #00000080;min-width:180px;padding:8px 6px;opacity:0;visibility:hidden;transform:translateY(8px);pointer-events:none;transition:opacity .2s ease,transform .2s ease,visibility .2s ease;list-style:none;z-index:9999}body.light-mode .profile-dropdown-menu,.light .profile-dropdown-menu{background-color:#fffffff5;border:1px solid rgba(0,0,0,.12);box-shadow:0 14px 35px #0000002e}.user-dropdown.show-menu .profile-dropdown-menu{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}.user-dropdown.show-menu .profile-chevron{transform:rotate(180deg)}.profile-dropdown-menu li a{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:var(--radius-sm, 8px);color:var(--text-secondary, #94a3b8);font-size:.88rem;font-weight:500;text-decoration:none;transition:all var(--transition-fast)}body.light-mode .profile-dropdown-menu li a,.light .profile-dropdown-menu li a{color:#334155}.profile-dropdown-menu li a:hover{background:#3b82f61f;color:var(--accent-blue, #3b82f6)}.profile-dropdown-menu li a.logout-link:hover{background:#ef44441f;color:var(--danger, #ef4444)}.main-layout{width:100%!important;max-width:none!important;margin:0!important;padding:40px 24px;box-sizing:border-box!important}.hero-banner{background:linear-gradient(135deg,#1d4ed8,#06b6d4,#7c3aed);border-radius:var(--radius-xl);padding:60px 40px;text-align:center;color:#fff;margin-bottom:48px;position:relative;overflow:hidden;box-shadow:var(--shadow-lg),var(--shadow-glow)}.hero-banner:before{content:"";position:absolute;top:-30%;left:-20%;width:60%;height:120%;background:radial-gradient(circle,#ffffff1f,#fff0 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#00000026;background-color:#f8fafc}.btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.4)}.btn-outline:hover{background:#ffffff1a;border-color:#fff;transform:translateY(-2px)}.btn-secondary{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-glass)}.btn-secondary:hover{background-color:#3b82f614;border-color:var(--text-muted)}.circle-btn{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:1px solid var(--border-glass);background:var(--bg-secondary);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm)}.circle-btn:hover{transform:scale(1.08);border-color:var(--text-muted);box-shadow:var(--shadow-md);color:var(--accent-blue)}.workspace-section{margin-bottom:48px;scroll-margin-top:calc(var(--nav-height) + 20px)}.section-header{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:24px;flex-wrap:wrap;gap:20px}.section-title{font-family:var(--font-display);font-size:2rem;font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:12px}.section-desc{color:var(--text-secondary);font-size:.95rem}.stats-summary-widget{display:flex;gap:12px;flex-wrap:wrap}.widget-item{background:var(--bg-secondary);border:1px solid var(--border-glass);border-radius:var(--radius-md);padding:12px 20px;display:flex;flex-direction:column;align-items:center;box-shadow:var(--shadow-sm);min-width:110px;cursor:pointer;transition:transform .2s ease,border-color .2s ease,background-color .2s ease,box-shadow .2s ease}.widget-item[data-status]:hover{transform:translateY(-2px);border-color:var(--accent-blue);background-color:#3b82f614;box-shadow:var(--shadow-md)}.widget-item[data-status]:active{transform:translateY(0)}.study-row-btn:hover{background-color:var(--success)!important;color:#fff!important}.star-row-btn{background:#f59e0b1a;color:var(--text-secondary)}.star-row-btn.active{background-color:var(--warning)!important;color:#1e1b1b!important}.star-row-btn.active:hover{background-color:var(--warning)!important;color:#1e1b1b!important;opacity:.9}.star-row-btn:hover:not(.active){background-color:#f59e0b40!important;color:var(--warning)!important}.check-row-btn{background:#10b9811a;color:var(--text-secondary)}.check-row-btn.active{background-color:var(--success)!important;color:#fff!important}.check-row-btn.active:hover{background-color:var(--success)!important;color:#fff!important;opacity:.9}.check-row-btn:hover:not(.active){background-color:#10b98140!important;color:var(--success)!important}.speak-row-btn:hover{background-color:var(--accent-blue)!important;color:#fff!important}.list-tab-btn{padding:8px 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900px){.controls-dashboard{grid-template-columns:1fr;gap:16px}}.control-group{display:flex;flex-direction:column;gap:8px}.control-label{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.level-tabs{display:flex;gap:6px;flex-wrap:wrap}.level-tab{background:var(--bg-secondary);border:1px solid var(--border-glass);color:var(--text-secondary);padding:8px 16px;border-radius:var(--radius-sm);font-weight:600;font-size:.85rem;cursor:pointer;transition:all var(--transition-fast)}.level-tab:hover{background:#3b82f60d;color:var(--text-primary);border-color:var(--text-muted)}.level-tab.active{background-color:var(--accent-blue);color:#fff;border-color:var(--accent-blue);box-shadow:0 4px 10px #3b82f64d}.form-select{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-glass);border-radius:var(--radius-sm);padding:9px 12px;font-size:.9rem;font-weight:500;outline:none;cursor:pointer;transition:border var(--transition-fast)}.form-select:focus{border-color:var(--accent-blue)}.select-sm{padding:6px 8px;font-size:.8rem}.select-voice{max-width:180px}.inline-controls{flex-direction:row;align-items:flex-end;justify-content:flex-end;gap:12px;flex-wrap:wrap}.autoplay-wrap,.tts-voice-wrap{display:flex;align-items:center;gap:8px;height:38px}.search-container{margin-bottom:24px}.search-box{position:relative;display:flex;align-items:center}.search-icon{position:absolute;left:16px;color:var(--text-muted);font-size:1rem}.search-box input{width:100%;background:var(--bg-glass);border:1px solid var(--border-glass);border-radius:var(--radius-md);padding:14px 16px 14px 44px;color:var(--text-primary);font-size:.95rem;outline:none;transition:all var(--transition-fast);box-shadow:var(--shadow-sm)}.search-box input:focus{border-color:var(--accent-blue);box-shadow:var(--shadow-glow),var(--shadow-md);background:var(--bg-secondary)}.clear-btn{position:absolute;right:16px;background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:1rem;padding:4px}.clear-btn:hover{color:var(--text-primary)}.flashcard-workspace{max-width:650px;margin:0 auto}.card-viewport{position:relative;display:flex;flex-direction:column;gap:24px;align-items:center}.progress-bar-container{width:100%;height:8px;background-color:#3b82f614;border-radius:var(--radius-sm);overflow:hidden;position:relative;display:flex;align-items:center;margin-top:10px}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent-blue),var(--accent-teal));border-radius:var(--radius-sm);transition:width var(--transition-normal);box-shadow:0 0 10px #06b6d466}.progress-text{position:absolute;right:8px;font-size:.7rem;font-weight:700;color:var(--text-muted)}.flashcard-card-container{width:100%;perspective:1200px;-webkit-perspective:1200px;min-height:420px;height:420px;position:relative}.flashcard-swipe-track{width:100%;height:100%;position:relative;touch-action:pan-y;user-select:none;-webkit-user-select:none;transform-origin:center bottom;will-change:transform,opacity}.swipe-stamp{position:absolute;top:24px;z-index:50;padding:8px 18px;border-radius:12px;font-weight:900;font-size:1.15rem;letter-spacing:1px;opacity:0;pointer-events:none;transition:opacity .12s ease;display:flex;align-items:center;gap:8px;box-shadow:0 4px 16px #00000040}.swipe-stamp.stamp-memorized{left:20px;color:#10b981;border:3px solid #10b981;background:#10b98138;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transform:rotate(-12deg)}.swipe-stamp.stamp-unmemorized{right:20px;color:#ef4444;border:3px solid 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.pad-symbol{font-size:1.55rem;font-weight:900;line-height:1;margin-top:1px}.rhythm-pad.pad-1 .pad-symbol{color:#0284c7}.rhythm-pad.pad-2 .pad-symbol{color:#059669}.rhythm-pad.pad-3 .pad-symbol{color:#d97706}.rhythm-pad.pad-4 .pad-symbol{color:#e11d48}.rhythm-pad.pad-0 .pad-symbol{color:#7c3aed}html.dark .rhythm-pad.pad-1 .pad-symbol{color:#38bdf8}html.dark .rhythm-pad.pad-2 .pad-symbol{color:#34d399}html.dark .rhythm-pad.pad-3 .pad-symbol{color:#fbbf24}html.dark .rhythm-pad.pad-4 .pad-symbol{color:#f43f5e}html.dark .rhythm-pad.pad-0 .pad-symbol{color:#a855f7}.pad-title{font-size:.72rem;font-weight:900;color:#0f172a;margin-top:2px;letter-spacing:.2px;white-space:nowrap}html.dark .pad-title{color:#fff}.pad-key{font-size:.65rem;font-weight:800;color:#475569;background:#e2e8f0;border:1px solid #cbd5e1;padding:1px 6px;border-radius:4px;margin-top:2px;white-space:nowrap}html.dark 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.result-desc{color:#94a3b8!important}.result-stats-grid{display:grid!important;grid-template-columns:repeat(3,1fr)!important;gap:8px!important;margin-bottom:14px!important}.stat-pill{background:#f8fafc!important;border:1.5px solid #e2e8f0!important;border-radius:12px!important;padding:8px 4px!important;display:flex!important;flex-direction:column!important;align-items:center!important;gap:2px!important}html.dark .stat-pill{background:#1e293b!important;border-color:#ffffff1a!important}.stat-pill .label{font-size:.68rem!important;color:#64748b!important;font-weight:700!important}html.dark .stat-pill .label{color:#94a3b8!important}.stat-pill .val{font-size:1.15rem!important;font-weight:900!important;color:#0284c7!important}html.dark .stat-pill .val{color:#38bdf8!important}.result-beta-note{background:#fffbeb!important;border:1px solid #fde68a!important;border-radius:10px!important;padding:6px 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