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1.25rem;border:none;border-radius:var(--radius-md);font-size:.875rem;font-weight:500;cursor:pointer;transition:var(--transition-fast)}.btn-primary{background:var(--primary-color);color:var(--white)}.btn-primary:hover{background:var(--primary-hover);transform:scale(1.02)}.btn-primary:active{transform:scale(.98)}.btn-secondary{background:var(--white);color:var(--primary-color);border:2px solid var(--primary-color)}.btn-secondary:hover{background:var(--primary-light)}.btn-game{background:var(--yellow-color);color:var(--text-dark);font-weight:700}.btn-game:hover{transform:scale(1.05);box-shadow:var(--shadow-md)}.btn-success{background:var(--green-success);color:var(--white)}.btn-danger{background:var(--error-color);color:var(--white)}.btn-sm{padding:.375rem .75rem;font-size:.75rem}.card{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:1.5rem;transition:var(--transition-fast)}.card:hover{box-shadow:var(--shadow-md)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.card-title{font-size:1rem;font-weight:700;color:var(--text-dark);display:flex;align-items:center;gap:.5rem}.card-icon{font-size:1.25rem}.card-badge{padding:.25rem .75rem;border-radius:12px;font-size:.75rem;font-weight:500}.card-badge.success{background:var(--green-color);color:var(--text-dark)}.card-badge.warning{background:var(--yellow-color);color:var(--text-dark)}.card-badge.pending{background:var(--pink-color);color:var(--error-color)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem;margin-bottom:2rem}.stat-card{background:var(--white);border-radius:var(--radius-lg);padding:1.5rem;display:flex;align-items:center;gap:1rem;box-shadow:var(--shadow-sm);transition:var(--transition-fast)}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-icon{width:56px;height:56px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:1.75rem}.stat-icon.blue{background:var(--primary-light)}.stat-icon.yellow{background:var(--yellow-light)}.stat-icon.green{background:var(--green-color)}.stat-icon.pink{background:var(--pink-color)}.stat-info{flex:1}.stat-value{font-size:1.75rem;font-weight:700;color:var(--primary-color)}.stat-label{font-size:.875rem;color:var(--text-medium)}.data-table{width:100%;background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm)}.data-table th{background:var(--primary-color);color:var(--white);padding:1rem;text-align:left;font-weight:500}.data-table td{padding:1rem;border-bottom:1px solid var(--border-color)}.data-table tr:hover td{background:var(--bg-color)}.data-table .status-done{color:var(--success-color)}.data-table .status-pending{color:var(--warning-color)}.form-group{margin-bottom:1.25rem}.form-label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-dark)}.form-input{width:100%;padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:var(--radius-md);font-size:.875rem;transition:var(--transition-fast)}.form-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #409eff1a}.form-input::placeholder{color:var(--text-light)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:var(--white);border-radius:var(--radius-xl);padding:2rem;width:100%;max-width:500px;max-height:90vh;overflow-y:auto;animation:modalIn .3s ease}@keyframes modalIn{0%{opacity:0;transform:scale(.9) translateY(-20px)}to{opacity:1;transform:scale(1) translateY(0)}}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem}.modal-title{font-size:1.25rem;font-weight:700;color:var(--text-dark)}.modal-close{width:32px;height:32px;border:none;background:var(--bg-color);border-radius:50%;cursor:pointer;font-size:1.25rem;color:var(--text-medium);transition:var(--transition-fast)}.modal-close:hover{background:var(--pink-color);color:var(--error-color)}.modal-footer{display:flex;justify-content:flex-end;gap:1rem;margin-top:1.5rem}.toast{position:fixed;top:80px;right:20px;padding:1rem 1.5rem;border-radius:var(--radius-md);display:flex;align-items:center;gap:.75rem;box-shadow:var(--shadow-md);animation:toastIn .3s ease;z-index:1100}@keyframes toastIn{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}.toast-success{background:var(--green-color);color:var(--text-dark)}.toast-error{background:var(--pink-color);color:var(--error-color)}.toast-info{background:var(--primary-light);color:var(--primary-color)}.toast-icon{font-size:1.25rem}.upgrade-panel{background:linear-gradient(135deg,var(--primary-light) 0%,#E0F2FE 100%);border-radius:var(--radius-xl);padding:2rem;margin-bottom:2rem;position:relative;overflow:hidden}.upgrade-panel:before{content:"⭐🏆";position:absolute;top:-10px;right:-10px;font-size:4rem;opacity:.2}.level-display{display:flex;align-items:center;gap:1.5rem;margin-bottom:1.5rem}.level-badge{width:80px;height:80px;background:linear-gradient(135deg,var(--primary-color) 0%,#667eea 100%);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--white);font-weight:700;box-shadow:var(--shadow-md)}.level-badge .level-num{font-size:2rem}.level-badge .level-text{font-size:.75rem}.level-info{flex:1}.level-title{font-size:1.25rem;font-weight:700;color:var(--text-dark);margin-bottom:.5rem}.level-progress{display:flex;align-items:center;gap:1rem}.progress-bar{flex:1;height:12px;background:var(--white);border-radius:6px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color) 0%,var(--yellow-color) 100%);border-radius:6px;transition:width .5s ease}.progress-text{font-size:.875rem;color:var(--text-medium);white-space:nowrap}.power-display{display:flex;align-items:center;gap:2rem}.power-item{display:flex;align-items:center;gap:.5rem}.power-icon{font-size:1.5rem}.power-value{font-size:1.25rem;font-weight:700;color:var(--primary-color)}.task-card{background:var(--white);border-radius:var(--radius-lg);padding:1.5rem;margin-bottom:1rem;border-left:4px solid var(--primary-color);box-shadow:var(--shadow-sm);transition:var(--transition-fast)}.task-card:hover{transform:translate(4px);box-shadow:var(--shadow-md)}.task-card.completed{border-left-color:var(--success-color);background:linear-gradient(90deg,var(--green-color) 0%,var(--white) 100%)}.task-card.pending{border-left-color:var(--warning-color)}.task-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.task-title{font-size:1.125rem;font-weight:700;color:var(--text-dark)}.task-meta{display:flex;gap:1rem;font-size:.875rem;color:var(--text-medium);margin-bottom:1rem}.task-meta span{display:flex;align-items:center;gap:.25rem}.error-card{background:var(--white);border-radius:var(--radius-lg);padding:1.5rem;margin-bottom:1rem;border:2px solid var(--pink-color);box-shadow:var(--shadow-sm)}.error-card.corrected{border-color:var(--green-color)}.error-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.error-id{font-size:.75rem;color:var(--text-light)}.error-status{padding:.25rem .75rem;border-radius:12px;font-size:.75rem;font-weight:500}.error-status.pending{background:var(--pink-color);color:var(--error-color)}.error-status.done{background:var(--green-color);color:var(--text-dark)}.error-content{margin-bottom:1rem}.error-content h4{font-size:.875rem;color:var(--text-medium);margin-bottom:.5rem}.error-content p{color:var(--text-dark)}.badge-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:1rem}.badge-item{display:flex;flex-direction:column;align-items:center;padding:1rem;background:var(--bg-color);border-radius:var(--radius-lg);text-align:center}.badge-item.unlocked{background:linear-gradient(135deg,var(--yellow-light) 0%,var(--white) 100%)}.badge-icon{font-size:2.5rem;margin-bottom:.5rem}.badge-name{font-size:.75rem;color:var(--text-medium)}.filter-bar{display:flex;gap:.75rem;margin-bottom:1.5rem;flex-wrap:wrap}.filter-btn{padding:.5rem 1rem;background:var(--white);border:2px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-medium);cursor:pointer;transition:var(--transition-fast)}.filter-btn:hover{border-color:var(--primary-color);color:var(--primary-color)}.filter-btn.active{background:var(--primary-color);border-color:var(--primary-color);color:var(--white)}.empty-state{text-align:center;padding:3rem;color:var(--text-light)}.empty-state .empty-icon{font-size:4rem;margin-bottom:1rem}.empty-state h3{font-size:1.125rem;color:var(--text-medium);margin-bottom:.5rem}.empty-state p{font-size:.875rem}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes confetti{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(-100px) rotate(720deg);opacity:0}}.animate-shake{animation:shake .5s ease}.animate-pulse{animation:pulse .5s ease}@media (max-width: 1024px){.sidebar{width:180px}.main-content{padding:1.5rem}}@media (max-width: 768px){body{font-size:14px}.main-container{flex-direction:column}.sidebar{width:100%;height:auto;position:relative;top:0;border-right:none;border-bottom:1px solid var(--border-color)}.sidebar-nav{flex-direction:row;overflow-x:auto;padding:.5rem;scroll-behavior:smooth}.sidebar-nav a{white-space:nowrap;padding:.625rem 1rem}.stats-grid{grid-template-columns:repeat(2,1fr);gap:.75rem}.main-content{padding:1rem}.page-title{font-size:1.25rem}.stat-card{padding:1rem}.stat-value{font-size:1.5rem}.btn{padding:.5rem 1rem;font-size:.875rem}}.mobile-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:#fff;box-shadow:0 -2px 10px #0000001a;z-index:1000;padding:.5rem 0;padding-bottom:env(safe-area-inset-bottom,.5rem)}.mobile-nav-items{display:flex;justify-content:space-around;align-items:center}.mobile-nav-item{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:.5rem;color:#999;text-decoration:none;font-size:.7rem;transition:all .2s;flex:1;max-width:80px}.mobile-nav-item .nav-icon{font-size:1.5rem}.mobile-nav-item.active{color:#409eff}.mobile-nav-item.active .nav-icon{transform:scale(1.1)}@media (max-width: 768px){.mobile-nav{display:block}.main-container{padding-bottom:70px}.sidebar{display:none}.header-logo .logo-text{font-size:1rem}.header-user .username{display:none}}.mobile-menu-btn{display:none;width:40px;height:40px;border:none;background:transparent;cursor:pointer;padding:.5rem;flex-direction:column;justify-content:center;align-items:center;gap:5px}.mobile-menu-btn span{display:block;width:24px;height:2px;background:#409eff;border-radius:2px;transition:all .3s}.mobile-menu-btn.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.mobile-menu-btn.active span:nth-child(2){opacity:0}.mobile-menu-btn.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}@media (max-width: 768px){.mobile-menu-btn{display:flex}}.mobile-menu-overlay{display:none;position:fixed;top:60px;left:0;right:0;bottom:0;background:#00000080;z-index:99}.mobile-menu{display:none;position:fixed;top:60px;left:0;width:280px;max-width:80vw;height:calc(100vh - 60px);background:#fff;z-index:100;overflow-y:auto;transform:translate(-100%);transition:transform .3s ease}.mobile-menu.open{transform:translate(0)}.mobile-menu a{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;color:#666;text-decoration:none;border-bottom:1px solid #E2E8F0}.mobile-menu a.active{background:#e8f4ff;color:#409eff}.mobile-menu a .nav-icon{font-size:1.5rem}@media (max-width: 768px){.mobile-menu-overlay.show,.mobile-menu{display:block}}.table-scroll-wrapper{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -1rem;padding:0 1rem}.data-table{min-width:600px}@media (max-width: 768px){.form-input,.form-select{padding:.875rem 1rem;font-size:16px}.form-group{margin-bottom:1rem}}.grid-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}@media (max-width: 768px){.grid-cards{grid-template-columns:1fr;gap:.75rem}}@media (min-width: 769px) and (max-width: 1024px){.grid-cards{grid-template-columns:repeat(2,1fr)}}@media (max-width: 768px){.modal-overlay{align-items:flex-end}.modal{max-width:100%;max-height:90vh;border-radius:16px 16px 0 0;padding:1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0))}}.difficulty-badge{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .75rem;border-radius:12px;font-size:.75rem;font-weight:500}.difficulty-badge.basic{background:var(--green-color)}.difficulty-badge.medium{background:var(--yellow-light)}.difficulty-badge.advanced{background:#ffe0b2}.difficulty-badge.exam{background:var(--pink-color)}.mastery-badge{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .75rem;border-radius:12px;font-size:.75rem;font-weight:500}.mastery-badge.excellent{background:var(--green-color);color:var(--success-color)}.mastery-badge.good{background:var(--primary-light);color:var(--primary-color)}.mastery-badge.basic{background:var(--yellow-light);color:#b7791f}.mastery-badge.needs-work{background:var(--pink-color);color:var(--error-color)}.loading{display:flex;align-items:center;justify-content:center;padding:2rem;color:var(--text-medium)}.loading:before{content:"";width:20px;height:20px;border:2px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin .8s linear infinite;margin-right:.75rem}@keyframes spin{to{transform:rotate(360deg)}}