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infinite;background:linear-gradient(135deg,#fb922433,#ef444433);color:#ef4444}.streak-flame{font-size:1rem}.onboarding{align-items:center;display:flex;justify-content:center;min-height:100vh;padding:var(--space-lg)}.onboarding-content{max-width:640px;text-align:center;width:100%}.onboarding-welcome{align-items:center;display:flex;flex-direction:column;gap:var(--space-lg)}.onboarding-logo{align-items:center;animation:float 3s ease-in-out infinite;background:var(--gradient-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-glow);display:flex;font-size:2.5rem;height:80px;justify-content:center;width:80px}.onboarding-content h1{font-size:2.5rem;font-weight:800;letter-spacing:-.03em;line-height:1.2}.onboarding-subtitle{color:var(--text-secondary);font-size:1.1rem;line-height:1.6;max-width:440px}.onboarding-hint{color:var(--text-tertiary);font-size:.85rem}.onboarding-categories{align-items:center;display:flex;flex-direction:column;gap:var(--space-lg)}.onboarding-categories h2{font-size:1.8rem;font-weight:700;letter-spacing:-.02em}.category-grid{grid-gap:var(--space-md);display:grid;gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(160px,1fr));max-width:560px;width:100%}.category-card{align-items:center;background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);color:var(--text-primary);cursor:pointer;display:flex;flex-direction:column;font-family:var(--font-sans);gap:var(--space-sm);padding:var(--space-lg) var(--space-md);position:relative;text-align:center;transition:all var(--transition-base)}.category-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-lg),var(--shadow-glow);transform:translateY(-4px)}.category-card.selected{border-color:var(--accent-primary);box-shadow:var(--shadow-glow)}.category-card:disabled{cursor:wait;opacity:.7}.category-icon{align-items:center;background:var(--bg-tertiary);border-radius:var(--radius-md);color:var(--accent-primary);display:flex;font-size:1.4rem;height:48px;justify-content:center;width:48px}.category-card h3{font-size:.95rem;font-weight:600}.category-card p{color:var(--text-secondary);font-size:.8rem;line-height:1.4}.category-loading{align-items:center;background:var(--glass-bg);border-radius:var(--radius-lg);display:flex;inset:0;justify-content:center;position:absolute}.deck-grid{grid-gap:var(--space-lg);display:grid;gap:var(--space-lg);grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.deck-card{animation:slideUp .3s ease backwards;background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);cursor:pointer;padding:var(--space-lg);position:relative;transition:all var(--transition-base)}.deck-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-lg);transform:translateY(-4px)}.deck-card:first-child{animation-delay:0ms}.deck-card:nth-child(2){animation-delay:50ms}.deck-card:nth-child(3){animation-delay:.1s}.deck-card:nth-child(4){animation-delay:.15s}.deck-card:nth-child(5){animation-delay:.2s}.deck-card:nth-child(6){animation-delay:.25s}.deck-card-header{align-items:flex-start;display:flex;justify-content:space-between;margin-bottom:var(--space-md)}.deck-emoji{font-size:2rem}.deck-emoji-lg{font-size:3rem}.deck-menu-wrapper{position:relative}.deck-menu-btn{align-items:center;background:#0000;border:none;border-radius:var(--radius-sm);color:var(--text-tertiary);cursor:pointer;display:flex;height:32px;justify-content:center;transition:all var(--transition-fast);width:32px}.deck-menu-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.deck-menu{animation:fadeIn .15s ease;background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);min-width:140px;padding:var(--space-xs);position:absolute;right:0;top:100%;z-index:50}.deck-menu button{align-items:center;background:#0000;border:none;border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;display:flex;font-family:var(--font-sans);font-size:.85rem;gap:var(--space-sm);padding:8px 12px;transition:all var(--transition-fast);width:100%}.deck-menu button:hover{background:var(--bg-hover);color:var(--text-primary)}.deck-menu button.danger:hover{background:var(--error-bg);color:var(--error)}.deck-name{font-size:1.1rem;font-weight:600;letter-spacing:-.01em;margin-bottom:var(--space-xs)}.deck-description{-webkit-line-clamp:2;-webkit-box-orient:vertical;color:var(--text-secondary);display:-webkit-box;font-size:.85rem;line-height:1.5;margin-bottom:var(--space-md);overflow:hidden}.deck-counts{display:flex;font-size:.8rem;font-weight:500;gap:var(--space-md)}.count-new{color:var(--info)}.count-learning{color:var(--warning)}.count-due{color:var(--success)}.deck-progress{margin-top:var(--space-md)}.progress-bar{background:var(--bg-tertiary);border-radius:2px;display:flex;height:4px;overflow:hidden}.progress-segment{height:100%;transition:width var(--transition-slow)}.progress-segment.mature{background:var(--success)}.progress-segment.due{background:var(--accent-primary)}.progress-segment.learning{background:var(--warning)}.progress-segment.new{background:var(--info)}.deck-header{flex-wrap:wrap;justify-content:space-between;margin-bottom:var(--space-xl)}.deck-header,.deck-header-info{align-items:center;display:flex;gap:var(--space-lg)}.deck-header-info h1{font-size:1.75rem;font-weight:700;letter-spacing:-.02em}.deck-header-actions{display:flex;gap:var(--space-sm)}.deck-stats-bar{grid-gap:var(--space-md);background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);display:grid;gap:var(--space-md);grid-template-columns:repeat(4,1fr);margin-bottom:var(--space-xl);padding:var(--space-lg)}.stat-item{align-items:center;display:flex;flex-direction:column;gap:4px}.stat-value{font-size:1.5rem;font-weight:700}.stat-label{color:var(--text-secondary);font-size:.8rem;letter-spacing:.05em;text-transform:uppercase}.card-list{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);overflow:hidden}.card-list-header{border-bottom:1px solid var(--border-primary);padding:var(--space-md) var(--space-lg)}.card-list-header h3{color:var(--text-secondary);font-size:.9rem;font-weight:600}.card-list-item{align-items:center;border-bottom:1px solid var(--border-secondary);display:flex;justify-content:space-between;padding:var(--space-md) var(--space-lg);transition:background var(--transition-fast)}.card-list-item:last-child{border-bottom:none}.card-list-item:hover{background:var(--bg-hover)}.card-list-content{flex:1 1;min-width:0}.card-front-preview{font-size:.9rem;font-weight:500;margin-bottom:4px}.card-back-preview,.card-front-preview{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.card-back-preview{color:var(--text-secondary);font-size:.8rem}.card-list-actions{display:flex;gap:4px;margin-left:var(--space-md)}.editor-header{align-items:center;display:flex;gap:var(--space-md);margin-bottom:var(--space-xl)}.editor-header h1{font-size:1.5rem;font-weight:700}.cards-added-badge{background:var(--success-bg);border-radius:var(--radius-full);color:var(--success);font-size:.8rem;font-weight:600;padding:4px 12px}.card-editor{animation:slideUp .3s ease}.editor-panels{grid-gap:var(--space-lg);display:grid;gap:var(--space-lg);grid-template-columns:1fr}.editor-panels:has(.preview-panel){grid-template-columns:1fr 1fr}.editor-field{margin-bottom:var(--space-lg)}.editor-field label{align-items:center;color:var(--text-secondary);display:flex;font-size:.85rem;font-weight:600;justify-content:space-between;letter-spacing:.05em;margin-bottom:var(--space-sm);text-transform:uppercase}.word-count{font-size:.8rem;font-weight:400;letter-spacing:0;text-transform:none}.editor-field input,.editor-field textarea{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-mono);font-size:.9rem;line-height:1.6;padding:var(--space-md);resize:vertical;transition:border-color var(--transition-fast);width:100%}.editor-field input:focus,.editor-field textarea:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-glow);outline:none}.editor-warnings{margin-bottom:var(--space-md)}.warning-item{background:var(--warning-bg);border-radius:var(--radius-sm);color:var(--warning);font-size:.85rem;margin-bottom:var(--space-xs);padding:var(--space-sm) var(--space-md)}.editor-actions{display:flex;gap:var(--space-sm)}.editor-hint{color:var(--text-tertiary);font-size:.8rem;margin-top:var(--space-md)}.preview-panel{display:flex;flex-direction:column;gap:var(--space-md)}.preview-card{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-md);padding:var(--space-lg)}.preview-label{color:var(--text-tertiary);font-size:.75rem;font-weight:600;letter-spacing:.05em;margin-bottom:var(--space-md);text-transform:uppercase}.preview-content{font-size:.95rem;line-height:1.7}.preview-content p{margin-bottom:var(--space-sm)}.preview-content strong{color:var(--accent-primary)}.preview-content ol,.preview-content ul{margin-bottom:var(--space-sm);padding-left:var(--space-lg)}.deck-form{animation:slideUp .3s ease;max-width:500px}.form-field{margin-bottom:var(--space-xl)}.form-field label{color:var(--text-secondary);display:block;font-size:.85rem;font-weight:600;letter-spacing:.05em;margin-bottom:var(--space-sm);text-transform:uppercase}.form-field input,.form-field textarea{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-sans);font-size:1rem;padding:var(--space-md);transition:border-color var(--transition-fast);width:100%}.form-field input:focus,.form-field textarea:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-glow);outline:none}.emoji-picker{display:flex;flex-wrap:wrap;gap:var(--space-sm)}.emoji-option{align-items:center;background:var(--bg-card);border:2px solid var(--border-primary);border-radius:var(--radius-md);cursor:pointer;display:flex;font-size:1.3rem;height:44px;justify-content:center;transition:all var(--transition-fast);width:44px}.emoji-option.selected,.emoji-option:hover{border-color:var(--accent-primary);transform:scale(1.1)}.emoji-option.selected{background:var(--accent-glow)}.study-page{max-width:720px;padding-bottom:var(--space-2xl)}.study-header{align-items:center;display:flex;gap:var(--space-md);margin-bottom:var(--space-sm)}.study-progress-info{display:flex;flex:1 1;flex-direction:column}.study-deck-name{font-size:.95rem;font-weight:600}.study-counter{color:var(--text-secondary);font-size:.8rem}.card-state-badge{border-radius:var(--radius-full);font-size:.7rem;font-weight:700;letter-spacing:.05em;padding:4px 10px;text-transform:uppercase}.state-new{background:var(--info-bg);color:var(--info)}.state-learning{background:var(--warning-bg);color:var(--warning)}.state-relearning{background:var(--error-bg);color:var(--error)}.state-review{background:var(--success-bg);color:var(--success)}.study-progress-bar{background:var(--bg-tertiary);border-radius:2px;height:3px;margin-bottom:var(--space-xl);overflow:hidden}.study-progress-fill{background:var(--gradient-primary);border-radius:2px;height:100%;transition:width var(--transition-slow)}.study-area{align-items:center;display:flex;flex-direction:column;position:relative}.study-card{cursor:pointer;margin-bottom:var(--space-xl);min-height:300px;perspective:1000px;width:100%}.study-card-inner{min-height:300px;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);width:100%}.study-card.flipped .study-card-inner{transform:rotateY(180deg)}.study-card-back,.study-card-front{align-items:center;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;inset:0;justify-content:center;overflow-y:auto;padding:var(--space-2xl);position:absolute;text-align:center}.study-card-back{align-items:flex-start;text-align:left;transform:rotateY(180deg)}.card-content{font-size:1.1rem;line-height:1.8;width:100%}.card-content p{margin-bottom:var(--space-sm)}.card-content strong{color:var(--accent-primary)}.card-content h1,.card-content h2,.card-content h3{margin-bottom:var(--space-md)}.card-content ol,.card-content ul{margin-bottom:var(--space-sm);padding-left:var(--space-lg)}.card-content li{margin-bottom:4px}.card-content blockquote{border-left:3px solid var(--accent-primary);color:var(--text-secondary);margin:var(--space-md) 0;padding-left:var(--space-md)}.card-content table{border-collapse:collapse;margin:var(--space-md) 0;width:100%}.card-content td,.card-content th{border:1px solid var(--border-primary);padding:var(--space-sm) var(--space-md);text-align:left}.card-content th{background:var(--bg-tertiary);font-weight:600}.flip-hint{color:var(--text-tertiary);font-size:.85rem;margin-top:var(--space-xl)}.celebration-effect{border-radius:var(--radius-xl);inset:0;pointer-events:none;position:absolute}.celebration-good{animation:successPulse .6s ease;box-shadow:0 0 0 0 #34d39966}.celebration-easy{animation:successPulse .6s ease;box-shadow:0 0 0 0 #7c5cfc66}.study-card.good .study-card-back,.study-card.good .study-card-front{border-color:var(--success)}.study-card.easy .study-card-back,.study-card.easy .study-card-front{animation:cardGlow .6s ease;border-color:var(--accent-primary)}.study-card.hard .study-card-back,.study-card.hard .study-card-front{border-color:var(--info)}.grading-buttons{grid-gap:var(--space-sm);animation:slideUp .25s ease;display:grid;gap:var(--space-sm);grid-template-columns:repeat(4,1fr);width:100%}.grade-btn{align-items:center;background:var(--bg-card);border:2px solid var(--border-primary);border-radius:var(--radius-md);cursor:pointer;display:flex;flex-direction:column;font-family:var(--font-sans);gap:4px;padding:var(--space-md) var(--space-sm);transition:all var(--transition-base)}.grade-btn:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.grade-btn:active{transform:translateY(0) scale(.97)}.grade-key{background:var(--bg-tertiary);border-radius:4px;color:var(--text-tertiary);font-size:.7rem;font-weight:600;padding:2px 6px}.grade-label{font-size:.9rem;font-weight:600}.grade-interval{color:var(--text-tertiary);font-size:.75rem}.grade-again{border-color:#f871714d}.grade-again:hover{background:var(--error-bg);border-color:var(--error)}.grade-again .grade-label{color:var(--error)}.grade-hard{border-color:#fbbf244d}.grade-hard:hover{background:var(--warning-bg);border-color:var(--warning)}.grade-hard .grade-label{color:var(--warning)}.grade-good{border-color:#34d3994d}.grade-good:hover{background:var(--success-bg);border-color:var(--success)}.grade-good .grade-label{color:var(--success)}.grade-easy{border-color:#7c5cfc4d}.grade-easy:hover{background:#7c5cfc1a;border-color:var(--accent-primary)}.grade-easy .grade-label{color:var(--accent-primary)}.session-selector{align-items:center;animation:fadeIn .4s ease;display:flex;flex-direction:column;gap:var(--space-xl);padding-top:var(--space-3xl);text-align:center}.session-selector h2{font-size:1.5rem;font-weight:700}.session-options{display:flex;flex-wrap:wrap;gap:var(--space-md);justify-content:center}.btn-session{background:var(--bg-card);border:2px solid var(--border-primary);border-radius:var(--radius-lg);color:var(--text-primary);cursor:pointer;font-family:var(--font-sans);font-size:1.1rem;font-weight:600;padding:var(--space-md) var(--space-xl);transition:all var(--transition-base)}.btn-session:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-lg);transform:translateY(-2px)}.btn-session-all{background:var(--gradient-primary);border-color:#0000;color:#fff}.session-summary,.study-complete{align-items:center;animation:fadeIn .5s ease;display:flex;flex-direction:column;gap:var(--space-xl);padding-top:var(--space-3xl);text-align:center}.complete-icon,.summary-celebration{animation:float 2s ease-in-out infinite;font-size:4rem}.session-summary h2,.study-complete h2{font-size:1.8rem;font-weight:700}.summary-stats{grid-gap:var(--space-xl);background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);display:grid;gap:var(--space-xl);grid-template-columns:repeat(3,1fr);max-width:480px;padding:var(--space-xl);width:100%}.summary-stat{align-items:center;display:flex;flex-direction:column;gap:4px}.summary-value{-webkit-text-fill-color:#0000;background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;font-size:2rem;font-weight:800}.summary-label{color:var(--text-secondary);font-size:.8rem}.summary-insight{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);color:var(--text-secondary);font-size:.95rem;line-height:1.6;max-width:480px;padding:var(--space-md) var(--space-lg)}.summary-actions{display:flex;gap:var(--space-md)}.stats-grid{grid-gap:var(--space-md);display:grid;gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:var(--space-2xl)}.stat-card{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center;transition:all var(--transition-base)}.stat-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-glow)}.stat-card-icon{align-items:center;background:var(--accent-glow);border-radius:var(--radius-md);color:var(--accent-primary);display:inline-flex;font-size:1.1rem;height:40px;justify-content:center;margin-bottom:var(--space-md);width:40px}.stat-card-value{display:block;font-size:2rem;font-weight:800;letter-spacing:-.03em;margin-bottom:4px}.stat-card-label{color:var(--text-secondary);font-size:.85rem;font-weight:500}.stat-card-sub{color:var(--text-tertiary);font-size:.8rem;margin-top:4px}.stats-section{margin-bottom:var(--space-2xl)}.stats-section h2{font-size:1.2rem;font-weight:600;margin-bottom:var(--space-md)}.mastery-bar{background:var(--bg-tertiary);border-radius:6px;display:flex;height:12px;margin-bottom:var(--space-md);overflow:hidden}.mastery-segment{height:100%;transition:width var(--transition-slow)}.mastery-segment.mature{background:var(--success)}.mastery-segment.review{background:var(--accent-primary)}.mastery-segment.learning{background:var(--warning)}.mastery-segment.new{background:var(--info)}.mastery-segment.empty{background:var(--bg-tertiary)}.mastery-legend{display:flex;flex-wrap:wrap;gap:var(--space-lg)}.legend-item{align-items:center;color:var(--text-secondary);display:flex;font-size:.8rem;gap:6px}.legend-dot{border-radius:50%;height:10px;width:10px}.legend-dot.mature{background:var(--success)}.legend-dot.review{background:var(--accent-primary)}.legend-dot.learning{background:var(--warning)}.legend-dot.new{background:var(--info)}.heatmap{display:flex;flex-direction:column;gap:var(--space-md)}.heatmap-grid{grid-gap:3px;display:grid;gap:3px;grid-template-columns:repeat(auto-fill,14px)}.heatmap-cell{border-radius:3px;height:14px;transition:all var(--transition-fast);width:14px}.heatmap-cell:hover{transform:scale(1.3)}.heat-0{background:var(--bg-tertiary)}.heat-1{background:#7c5cfc40}.heat-2{background:#7c5cfc73}.heat-3{background:#7c5cfcb3}.heat-4{background:var(--accent-primary)}.heatmap-labels{align-items:center;color:var(--text-tertiary);display:flex;font-size:.75rem;gap:4px}.heatmap-labels .heatmap-cell{height:12px;width:12px}.bar-chart{align-items:flex-end;background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);display:flex;gap:var(--space-sm);height:160px;padding:var(--space-lg)}.bar-item{align-items:center;display:flex;flex:1 1;flex-direction:column;gap:4px;height:100%;justify-content:flex-end}.bar{background:var(--gradient-primary);border-radius:4px 4px 0 0;max-width:40px;min-height:2px;transition:height var(--transition-slow);width:100%}.bar-item.today .bar{box-shadow:0 0 12px var(--accent-glow)}.bar-value{color:var(--text-secondary);font-size:.75rem;font-weight:600}.bar-label{color:var(--text-tertiary);font-size:.7rem}.empty-state{align-items:center;animation:fadeIn .5s ease;display:flex;flex-direction:column;padding:var(--space-3xl) var(--space-lg);text-align:center}.empty-state-icon{animation:float 3s ease-in-out infinite;font-size:4rem;margin-bottom:var(--space-lg)}.empty-state-title{font-size:1.3rem;font-weight:700;margin-bottom:var(--space-sm)}.empty-state-description{color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-xl);max-width:400px}@media (max-width:768px){.page{padding:var(--space-md) var(--space-md) var(--space-2xl)}.page-header{flex-direction:column}.deck-grid{grid-template-columns:1fr}.deck-header{align-items:flex-start;flex-direction:column}.deck-header-actions{width:100%}.deck-header-actions .btn{flex:1 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