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var(--bg-tertiary));--glass-bg:var(--bg-secondary);--glass-border:var(--border-color);--glass-blur:none}[data-theme=light]{--bg-primary:#f1f5f9;--bg-secondary:#fff;--bg-tertiary:#f8fafc;--bg-card:#fff;--bg-card-hover:#f1f5f9;--bg-input:#fff;--bg-body:#f1f5f9;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--text-inverse:#f8fafc;--border-color:#e2e8f0;--border-light:#cbd5e1;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 25px -3px #0000001a, 0 4px 6px -2px #0000000d;--shadow-glow:0 0 20px #6366f126;--gradient-surface:linear-gradient(135deg, #fff, #f8fafc);--glass-bg:var(--bg-secondary);--glass-border:var(--border-color)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{width:100%;height:100%}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 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var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);transition:var(--transition-normal)}.card-elevated:hover{box-shadow:var(--shadow-lg);border-color:var(--primary-light);transform:translateY(-4px)}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-color);z-index:100;width:280px;transition:var(--transition-normal);flex-direction:column;display:flex;position:relative}.sidebar-close-mobile{color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:4px;font-size:1.2rem;display:none}.mobile-menu-toggle{z-index:90;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);width:40px;height:40px;color:var(--text-primary);cursor:pointer;box-shadow:var(--shadow-md);justify-content:center;align-items:center;font-size:1.2rem;display:none;position:fixed;top:16px;left:16px}.sidebar-overlay{z-index:95;background:#000000b3;animation:.2s 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slideIn{0%{opacity:0;transform:translate(-10px)}to{opacity:1;transform:translate(0)}}@media (width<=768px){.sidebar{width:240px}.main-content{padding:var(--space-md)}.stats-grid{grid-template-columns:1fr 1fr}.form-row{grid-template-columns:1fr}.flashcard-container{width:340px;height:240px}}.toast-container{top:var(--space-lg);right:var(--space-lg);z-index:200;gap:var(--space-sm);flex-direction:column;display:flex;position:fixed}.toast{padding:var(--space-md) var(--space-lg);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);align-items:center;gap:var(--space-sm);min-width:280px;font-size:.85rem;font-weight:500;animation:.3s slideIn;display:flex}.toast-success{background:var(--success);color:#fff}.toast-error{background:var(--danger);color:#fff}.toast-warning{background:var(--warning);color:var(--text-inverse)}.tabs{background:var(--bg-tertiary);border-radius:var(--radius-md);margin-bottom:var(--space-lg);gap:2px;padding:3px;display:flex}.tab{padding:8px var(--space-md);color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-sm);transition:var(--transition-fast);background:0 0;border:none;flex:1;font-family:inherit;font-size:.82rem;font-weight:600}.tab:hover{color:var(--text-primary)}.tab.active{background:var(--bg-card);color:var(--text-primary);box-shadow:var(--shadow-sm)}.search-bar{margin-bottom:var(--space-md);position:relative}.search-bar .form-input{padding-left:40px}.search-bar-icon{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:14px;transform:translateY(-50%)}.header-bar{margin-bottom:var(--space-lg);justify-content:space-between;align-items:center;gap:var(--space-md);flex-wrap:wrap;display:flex}.expiring-alert{border-radius:var(--radius-lg);padding:var(--space-lg);margin-bottom:var(--space-lg);align-items:center;gap:var(--space-md);background:linear-gradient(135deg,#f59e0b1a,#ef44440d);border:1px solid #f59e0b4d;display:flex}.expiring-alert-icon{font-size:1.5rem}.expiring-alert-text{color:var(--warning-light);font-size:.88rem}.expiring-alert-text strong{color:var(--warning)}.loading{padding:var(--space-2xl);flex-direction:column;justify-content:center;align-items:center;display:flex}.spinner{border:3px solid var(--border-color);border-top-color:var(--primary);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{margin-top:var(--space-md);color:var(--text-secondary);font-size:.88rem}@media (width<=1024px){.sidebar{height:100vh;box-shadow:var(--shadow-lg);z-index:1000;width:260px;position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-close-mobile{color:var(--text-muted);justify-content:center;align-items:center;margin-left:auto;padding:8px;font-size:1.2rem;display:flex}.mobile-menu-toggle{display:flex}.main-content{padding:var(--space-lg) var(--space-md);width:100%;padding-top:70px}.header-bar{align-items:flex-start;gap:var(--space-sm);flex-direction:column}.header-bar .btn{width:100%}}@media (width<=768px){.stats-grid{gap:var(--space-sm);grid-template-columns:1fr}.page-title{font-size:1.5rem}.stat-card{padding:var(--space-md)}.form-row{grid-template-columns:1fr}.table-container{border-left:none;border-right:none;border-radius:0;margin:0 -1rem}.table th,.table td{padding:10px;font-size:.8rem}.word-display{font-size:2.25rem!important}.study-card{min-height:auto!important;padding:1.5rem 1rem!important}.flashcard-container{max-width:320px;width:100%!important;height:220px!important}}@media (width<=480px){.modal{border-radius:var(--radius-lg);width:96%;margin:2% auto}.modal-body{padding:var(--space-md)}.btn{padding:8px 16px;font-size:.8rem}.tabs{flex-direction:column;gap:4px}.tab{font-size:.75rem}}@media (height<=500px) and (orientation:landscape){.modal{max-height:95vh}.sidebar{width:220px}.main-content{padding-top:60px}.study-card{min-height:200px!important;padding:1rem!important}.word-display{font-size:1.8rem!important}}.study-card{transition:all .3s cubic-bezier(.4,0,.2,1)}.word-display{transition:font-size .2s}.selected-students-container{background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border-color);flex-wrap:wrap;gap:8px;max-height:120px;margin-top:8px;padding:8px;display:flex;overflow-y:auto}.selected-student-chip{background:var(--primary);color:#fff;border-radius:20px;align-items:center;gap:6px;padding:4px 10px;font-size:.85rem;font-weight:500;animation:.2s ease-out scale-in;display:flex}.selected-student-chip-remove{color:#fff;cursor:pointer;opacity:.8;background:0 0;border:none;align-items:center;padding:0;font-size:1rem;display:flex}.selected-student-chip-remove:hover{opacity:1}.desktop-only{display:block}.mobile-only{display:none}@media (width<=768px){.desktop-only{display:none!important}.mobile-only{display:flex!important}}@keyframes scale-in{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}.sidebar-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:999;background:#00000080;animation:.3s fadeIn;position:fixed;inset:0}.mobile-menu-toggle{z-index:1100}.fade-in{animation:.5s ease-out forwards fadeIn}.slide-up{animation:.6s cubic-bezier(.16,1,.3,1) forwards slideUp}.shake{animation:.5s cubic-bezier(.36,.07,.19,.97) both shake}.switch{width:50px;height:24px;display:inline-block;position:relative}.switch input{opacity:0;width:0;height:0}.slider{cursor:pointer;background-color:var(--border-color);transition:all .4s;position:absolute;inset:0}.slider:before{content:"";background-color:#fff;width:18px;height:18px;transition:all .4s;position:absolute;bottom:3px;left:3px}input:checked+.slider{background-color:var(--primary)}input:focus+.slider{box-shadow:0 0 1px var(--primary)}input:checked+.slider:before{transform:translate(26px)}.slider.round{border-radius:34px}.slider.round:before{border-radius:50%}.child-mode-dashboard{padding:var(--space-xl);max-width:1200px;margin:0 auto}.child-card{perspective:1000px;cursor:pointer}.child-card-inner{border-radius:var(--radius-xl);padding:var(--space-xl);text-align:center;background:#fff;border:5px solid #0000;transition:transform .3s cubic-bezier(.175,.885,.32,1.275);box-shadow:0 10px 25px #0000001a}.child-card:hover .child-card-inner{border-color:var(--accent);transform:scale(1.05)translateY(-10px)}.child-game-grid{gap:var(--space-xl);margin-top:var(--space-xl);grid-template-columns:repeat(auto-fill,minmax(280px,1fr));display:grid}.game-iframe-container{border-radius:var(--radius-lg);width:100%;height:0;box-shadow:var(--shadow-lg);background:#000;padding-bottom:56.25%;position:relative;overflow:hidden}.game-iframe-container iframe{border:none;width:100%;height:100%;position:absolute;top:0;left:0}