.tab-bar{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:space-around;align-items:center;background:var(--bg-secondary);border-top:1px solid var(--border);padding:var(--spacing-sm) 0;padding-bottom:calc(var(--spacing-sm) + env(safe-area-inset-bottom));z-index:100}.tab-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:var(--spacing-xs) var(--spacing-md);color:var(--text-muted);text-decoration:none;font-size:.625rem;font-weight:500;transition:color .2s ease}.tab-item.active{color:var(--primary)}.tab-item:hover{color:var(--primary-dark)}.tab-item svg{transition:transform .2s ease}.tab-item.active svg{transform:scale(1.05)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius);font-weight:600;font-size:.875rem;cursor:pointer;transition:all .2s ease;border:none;outline:none;text-decoration:none}.btn-primary:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-1px)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--bg-primary);color:var(--text-primary)}.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--error);color:#fff}.btn-sm{padding:var(--spacing-xs) var(--spacing-sm);font-size:.75rem}.btn-md{padding:var(--spacing-sm) var(--spacing-lg);font-size:.875rem}.btn-lg{padding:var(--spacing-md) var(--spacing-xl);font-size:1rem}.btn-icon{width:2.5rem;height:2.5rem;padding:0;border-radius:var(--radius-full)}.btn-disabled,.btn:disabled{opacity:.5;cursor:not-allowed}.btn-loading{position:relative;color:transparent}.btn-spinner{position:absolute;width:1rem;height:1rem;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .6s linear infinite}.card{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden}.card-default{background:var(--bg-card)}.card-outlined{background:transparent;border:1px solid var(--border);box-shadow:none}.card-elevated{box-shadow:var(--shadow-md)}.card-gradient{background:linear-gradient(135deg,var(--primary) 0%,var(--accent-purple) 100%);color:#fff}.card-padding-none{padding:0}.card-padding-sm{padding:var(--spacing-sm)}.card-padding-md{padding:var(--spacing-md)}.card-padding-lg{padding:var(--spacing-lg)}.card-clickable{cursor:pointer;transition:transform .2s ease,box-shadow .2s ease}.card-clickable:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.card-clickable:active{transform:translateY(0)}.card-header{padding:var(--spacing-md);border-bottom:1px solid var(--border)}.card-body{padding:var(--spacing-md)}.card-footer{padding:var(--spacing-md);border-top:1px solid var(--border);background:var(--bg-primary)}.input-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}.input-label{font-size:.875rem;font-weight:600;color:var(--text-primary)}.input-required{color:var(--error);margin-left:2px}.input-wrapper{position:relative;display:flex;align-items:center}.input-wrapper.has-icon .input{padding-left:2.75rem}.input-icon{position:absolute;left:var(--spacing-md);color:var(--text-muted);pointer-events:none}.input{width:100%;padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--border);border-radius:var(--radius);font-size:1rem;background:var(--bg-secondary);color:var(--text-primary);transition:border-color .2s ease,box-shadow .2s ease}.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #3b82f61a}.input:disabled{background:var(--bg-primary);cursor:not-allowed;opacity:.7}.input-wrapper.input-error .input{border-color:var(--error)}.input-wrapper.input-error .input:focus{box-shadow:0 0 0 3px #ef44441a}.input-hint{font-size:.75rem;color:var(--text-muted)}.input-hint.error{color:var(--error)}select.input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--spacing-md) center;padding-right:2.5rem}textarea.input{min-height:100px;resize:vertical}.badge{display:inline-flex;align-items:center;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-full);font-weight:600}.badge-sm{font-size:.625rem;padding:2px var(--spacing-xs)}.badge-md{font-size:.75rem}.badge-lg{font-size:.875rem;padding:var(--spacing-xs) var(--spacing-md)}.badge-primary{background:#3b82f626;color:var(--primary-dark)}.badge-purple{background:#a78bfa26;color:#7c3aed}.badge-mint{background:#6ee7b726;color:#059669}.badge-orange{background:#fb923c26;color:#ea580c}.badge-success{background:#22c55e26;color:#15803d}.badge-warning{background:#eab30826;color:#a16207}.badge-error{background:#ef444426;color:#dc2626}.badge-neutral{background:var(--bg-primary);color:var(--text-secondary)}.progress-bar{width:100%;background:var(--border);border-radius:var(--radius-full);overflow:hidden;position:relative}.progress-bar-sm{height:.25rem}.progress-bar-md{height:.5rem}.progress-bar-lg{height:.75rem}.progress-bar-fill{height:100%;border-radius:var(--radius-full);transition:width .4s ease}.progress-bar-primary{background:var(--primary)}.progress-bar-success{background:var(--success)}.progress-bar-warning{background:var(--warning)}.progress-bar-error{background:var(--error)}.progress-bar-gradient{background:linear-gradient(90deg,var(--primary) 0%,var(--accent-purple) 100%)}.progress-bar-label{position:absolute;right:var(--spacing-xs);top:50%;transform:translateY(-50%);font-size:.625rem;font-weight:600;color:#fff}.progress-vertical{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--spacing-sm)}.progress-vertical-item{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);flex:1}.progress-vertical-bar{width:100%;max-width:2rem;border-radius:var(--radius);transition:height .4s ease}.progress-vertical-label{font-size:.625rem;color:var(--text-muted);font-weight:500}.home-page{padding-top:var(--spacing-md)}.home-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--spacing-lg)}.greeting-text{font-size:.875rem;color:var(--text-muted)}.greeting h1{font-size:1.5rem;margin-top:var(--spacing-xs)}.search-container{margin-bottom:var(--spacing-lg)}.search-bar{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--text-muted);text-decoration:none;transition:border-color .2s ease}.search-bar:hover{border-color:var(--primary)}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm);margin-bottom:var(--spacing-xl)}.home-section{margin-bottom:var(--spacing-xl)}.home-section h3{font-size:1rem;margin-bottom:var(--spacing-md)}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.see-all{font-size:.875rem;color:var(--primary);text-decoration:none;font-weight:500}.continue-card{text-decoration:none;display:block}.continue-content{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.continue-info h4{font-size:1rem;margin:var(--spacing-xs) 0;color:var(--text-primary)}.continue-info p{font-size:.75rem;color:var(--text-muted)}.continue-arrow{color:var(--text-muted)}.review-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.review-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md);background:var(--bg-card);border-radius:var(--radius);text-decoration:none;transition:transform .2s ease}.review-item:hover{transform:translate(4px)}.review-info{display:flex;flex-direction:column;gap:2px}.review-subject{font-size:.625rem;text-transform:uppercase;letter-spacing:.5px;color:var(--primary);font-weight:600}.review-title{font-size:.875rem;color:var(--text-primary);font-weight:500}.review-item svg{color:var(--text-muted)}.scan-cta{text-decoration:none;display:block;margin-bottom:var(--spacing-xl)}.scan-content{display:flex;align-items:center;gap:var(--spacing-md)}.scan-icon{width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:#fff3;border-radius:var(--radius-lg)}.scan-text h3{color:#fff;font-size:1.125rem;margin-bottom:var(--spacing-xs)}.scan-text p{color:#fffc;font-size:.75rem}.empty-state{text-align:center;padding:var(--spacing-xl);background:var(--bg-card);border-radius:var(--radius-lg);margin-top:var(--spacing-xl)}.empty-icon{color:var(--text-muted);margin-bottom:var(--spacing-md)}.empty-state h3{margin-bottom:var(--spacing-sm)}.empty-state p{font-size:.875rem;color:var(--text-muted)}.lessons-page{padding-top:var(--spacing-md)}.lessons-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg)}.lessons-header h1{font-size:1.5rem}.lessons-search{margin-bottom:var(--spacing-md)}.lessons-filters{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.filter-chips{display:flex;gap:var(--spacing-xs);overflow-x:auto;padding-bottom:var(--spacing-xs);-webkit-overflow-scrolling:touch}.filter-chip{padding:var(--spacing-xs) var(--spacing-md);background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-full);font-size:.75rem;font-weight:500;color:var(--text-secondary);cursor:pointer;white-space:nowrap;transition:all .2s ease}.filter-chip:hover{border-color:var(--primary);color:var(--primary)}.filter-chip.active{background:var(--primary);border-color:var(--primary);color:#fff}.subject-filter{padding:var(--spacing-xs) var(--spacing-sm);background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);font-size:.875rem;color:var(--text-primary);cursor:pointer}.lessons-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.lesson-card{text-decoration:none;display:block}.lesson-card .card{transition:transform .2s ease,box-shadow .2s ease}.lesson-card:hover .card{transform:translateY(-2px);box-shadow:var(--shadow-md)}.lesson-card-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.lesson-subject{font-size:.625rem;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);font-weight:600}.lesson-title{font-size:1rem;margin-bottom:var(--spacing-md);color:var(--text-primary)}.lesson-card-footer{display:flex;align-items:center;gap:var(--spacing-md)}.lesson-card-footer .progress-bar{flex:1}.lesson-arrow{color:var(--text-muted)}.lessons-empty{text-align:center;padding:var(--spacing-xl);color:var(--text-muted)}.lessons-empty svg{margin-bottom:var(--spacing-md)}.lessons-empty h3{margin-bottom:var(--spacing-sm);color:var(--text-primary)}.lessons-empty p{margin-bottom:var(--spacing-lg);font-size:.875rem}.quiz-container{display:flex;flex-direction:column;gap:var(--spacing-md)}.quiz-progress{display:flex;align-items:center;gap:var(--spacing-md)}.quiz-progress .progress-bar{flex:1;height:6px;background:var(--border);border-radius:var(--radius-full);overflow:hidden}.quiz-progress .progress-fill{height:100%;background:var(--primary);border-radius:var(--radius-full);transition:width .3s ease}.progress-text{font-size:.75rem;color:var(--text-muted);white-space:nowrap}.question-card .badge{margin-bottom:var(--spacing-md)}.question-text{font-size:1.125rem;line-height:1.5;margin-bottom:var(--spacing-lg)}.options-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.option{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-primary);border:2px solid var(--border);border-radius:var(--radius);text-align:left;cursor:pointer;transition:all .2s ease}.option:hover:not(:disabled){border-color:var(--primary-light)}.option.selected{border-color:var(--primary);background:#3b82f60d}.option.correct{border-color:var(--success);background:#22c55e1a}.option.incorrect{border-color:var(--error);background:#ef44441a}.option:disabled{cursor:default}.option-letter{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);border-radius:var(--radius);font-weight:600;font-size:.875rem;color:var(--text-secondary);flex-shrink:0}.option.selected .option-letter{background:var(--primary);color:#fff}.option-text{flex:1;font-size:.875rem}.option-icon{flex-shrink:0}.option-icon.correct{color:var(--success)}.option-icon.incorrect{color:var(--error)}.open-answer textarea{width:100%;padding:var(--spacing-md);border:1px solid var(--border);border-radius:var(--radius);font-size:.875rem;font-family:inherit;resize:vertical;min-height:100px}.open-answer textarea:focus{outline:none;border-color:var(--primary)}.open-answer textarea:disabled{background:var(--bg-primary)}.feedback{display:flex;align-items:flex-start;gap:var(--spacing-sm);padding:var(--spacing-md);border-radius:var(--radius);margin-top:var(--spacing-md);font-size:.875rem}.feedback.correct{background:#22c55e1a;color:#15803d}.feedback.incorrect{background:#ef44441a;color:#dc2626}.feedback svg{flex-shrink:0;margin-top:2px}.quiz-actions{margin-top:var(--spacing-md)}.quiz-complete{padding:var(--spacing-xl) 0}.result-card{text-align:center}.result-icon{width:80px;height:80px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-full);margin:0 auto var(--spacing-lg)}.result-icon.success{background:#6ee7b733;color:#059669}.result-icon.failure{background:#fb923c33;color:#ea580c}.result-card h2{margin-bottom:var(--spacing-lg)}.result-score{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);margin-bottom:var(--spacing-lg)}.score-value{font-size:3rem;font-weight:700;color:var(--primary)}.score-label{font-size:.875rem;color:var(--text-muted)}.result-message{font-size:.875rem;margin-bottom:var(--spacing-xl);max-width:280px;margin-left:auto;margin-right:auto}.result-actions{display:flex;gap:var(--spacing-md)}.result-actions .btn{flex:1}.quiz-empty{text-align:center;padding:var(--spacing-xl);color:var(--text-muted)}.lesson-detail-page{padding-top:var(--spacing-md);padding-bottom:0}.lesson-loading{display:flex;align-items:center;justify-content:center}.loader{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.lesson-header{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.back-btn{background:none;border:none;padding:var(--spacing-xs);color:var(--text-primary);cursor:pointer;flex-shrink:0}.lesson-title-section{flex:1}.lesson-title-section h1{font-size:1.25rem;margin:var(--spacing-xs) 0}.lesson-subject{font-size:.75rem;color:var(--text-muted)}.progress-card{margin-bottom:var(--spacing-lg)}.progress-info{display:flex;justify-content:space-between;margin-bottom:var(--spacing-sm);font-size:.75rem;color:var(--text-secondary)}.progress-count{font-weight:600;color:var(--primary)}.mastery-badge{display:flex;align-items:center;justify-content:center;gap:var(--spacing-xs);margin-top:var(--spacing-md);padding:var(--spacing-sm);background:#6ee7b726;border-radius:var(--radius);color:#059669;font-size:.875rem;font-weight:600}.lesson-tabs{display:flex;gap:var(--spacing-xs);margin-bottom:var(--spacing-lg);background:var(--bg-card);padding:var(--spacing-xs);border-radius:var(--radius-lg)}.tab{flex:1;display:flex;align-items:center;justify-content:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);background:none;border:none;border-radius:var(--radius);font-size:.75rem;font-weight:500;color:var(--text-muted);cursor:pointer;transition:all .2s ease}.tab.active{background:var(--primary);color:#fff}.tab:not(.active):hover{background:var(--bg-primary);color:var(--text-primary)}.lesson-content{animation:fadeIn .3s ease}.summary-content{display:flex;flex-direction:column;gap:var(--spacing-md)}.summary-content h3{font-size:1rem;margin-bottom:var(--spacing-md)}.summary-text p{margin-bottom:var(--spacing-sm);line-height:1.7;font-size:.875rem}.key-points{list-style:none;padding:0}.key-points li{display:flex;align-items:flex-start;gap:var(--spacing-sm);padding:var(--spacing-sm) 0;font-size:.875rem;border-bottom:1px solid var(--border)}.key-points li:last-child{border-bottom:none}.key-points li svg{color:var(--primary);flex-shrink:0;margin-top:2px}.podcast-content{display:flex;flex-direction:column;gap:var(--spacing-md)}.podcast-player{text-align:center}.podcast-header{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-lg);text-align:left}.podcast-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--primary-light);border-radius:var(--radius-lg);font-size:1.5rem}.podcast-header h3{font-size:1rem;margin-bottom:2px}.podcast-header p{font-size:.75rem;color:var(--text-muted)}.play-button{width:72px;height:72px;display:flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-full);margin:0 auto var(--spacing-lg);cursor:pointer;transition:transform .2s ease}.play-button:hover{transform:scale(1.05)}.podcast-disclaimer{padding:var(--spacing-sm);background:var(--bg-primary);border-radius:var(--radius)}.podcast-disclaimer p{font-size:.75rem;color:var(--text-muted)}.podcast-script{font-size:.875rem;line-height:1.7}.podcast-script h3{margin-bottom:var(--spacing-md)}.podcast-script p{margin-bottom:var(--spacing-sm)}.podcast-script .speaker{font-weight:600;color:var(--primary);margin-top:var(--spacing-md)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.stats-page{padding-top:var(--spacing-md)}.stats-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg)}.stats-header h1{font-size:1.5rem}.main-stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.stat-main-card{text-align:center}.stat-main-icon{width:3rem;height:3rem;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-lg);margin:0 auto var(--spacing-sm)}.stat-main-icon.primary{background:#3b82f626;color:var(--primary)}.stat-main-icon.mint{background:#6ee7b726;color:#059669}.stat-main-icon.orange{background:#fb923c26;color:#ea580c}.stat-main-icon.purple{background:#a78bfa26;color:#7c3aed}.stat-main-value{font-size:1.75rem;font-weight:700;color:var(--text-primary)}.stat-main-label{font-size:.75rem;color:var(--text-muted)}.stats-section{margin-bottom:var(--spacing-xl)}.stats-section h3{font-size:1rem;margin-bottom:var(--spacing-md)}.weekly-chart{padding:var(--spacing-md) 0}.mastery-overview{display:flex;flex-direction:column;gap:var(--spacing-md)}.mastery-row{display:grid;grid-template-columns:80px 1fr 40px;align-items:center;gap:var(--spacing-md)}.mastery-label{font-size:.75rem;color:var(--text-secondary);font-weight:500}.mastery-count{font-size:.875rem;font-weight:600;color:var(--text-primary);text-align:right}.badges-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm)}.badge-card{text-align:center;transition:transform .2s ease}.badge-card:hover{transform:scale(1.05)}.badge-icon{width:2.5rem;height:2.5rem;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--accent-orange) 0%,var(--accent-purple) 100%);color:#fff;border-radius:var(--radius-full);margin:0 auto var(--spacing-xs)}.badge-title{font-size:.625rem;color:var(--text-secondary);font-weight:500}.stats-empty{text-align:center;padding:var(--spacing-xl);color:var(--text-muted)}.stats-empty svg{margin-bottom:var(--spacing-md)}.stats-empty h3{margin-bottom:var(--spacing-sm);color:var(--text-primary)}.stats-empty p{font-size:.875rem}.profile-page{padding-top:var(--spacing-md)}.profile-header{margin-bottom:var(--spacing-lg)}.profile-header h1{font-size:1.5rem}.user-card{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.user-avatar{width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:var(--primary-light);color:var(--primary);border-radius:var(--radius-full)}.user-info{flex:1}.user-info h3{font-size:1.125rem;margin-bottom:2px}.user-info p{font-size:.75rem;color:var(--text-muted)}.profile-section{margin-bottom:var(--spacing-xl)}.profile-section h4{font-size:.75rem;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);margin-bottom:var(--spacing-sm);padding-left:var(--spacing-sm)}.profile-item{display:flex;align-items:center;justify-content:space-between;width:100%;padding:var(--spacing-md);background:none;border:none;border-bottom:1px solid var(--border);cursor:pointer;transition:background .2s 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--tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}