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var(--transition-fast)}.recent-activity-item:hover{background:var(--color-bg-secondary)}.recent-activity-item+.recent-activity-item{border-top:1px solid var(--color-border)}.recent-activity-icon{font-size:var(--font-size-lg);flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-elevated);border-radius:var(--radius-md)}.recent-activity-info{display:flex;flex-direction:column;gap:2px;min-width:0;flex:1}.recent-activity-title{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.recent-activity-meta{font-size:var(--font-size-xs);color:var(--color-text-muted)}.dashboard-today-progress{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent-light));border-radius:var(--radius-lg);margin-bottom:var(--spacing-lg);border:1px solid var(--color-border);animation:fadeInUp .4s .1s cubic-bezier(.4,0,.2,1) both}.dashboard-today-progress-info{flex:1}.dashboard-today-progress-label{font-size:var(--font-size-xs);color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:var(--letter-spacing-wide);margin-bottom:var(--spacing-xs)}.dashboard-today-progress-bar{height:8px;background:var(--color-bg-secondary);border-radius:var(--radius-full);overflow:hidden}.dashboard-today-progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));border-radius:var(--radius-full);transition:width .8s cubic-bezier(.4,0,.2,1)}.dashboard-today-progress-text{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-top:var(--spacing-xs)}.dashboard-today-progress-number{font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);color:var(--color-primary);font-variant-numeric:tabular-nums;line-height:1;flex-shrink:0}.quiz-start-card,.practice-start-card,.quiz-session{margin-top:var(--spacing-lg)}.quiz-progress-bar{height:6px;background:var(--color-bg-tertiary);border-radius:var(--radius-full);overflow:hidden;margin-bottom:var(--spacing-xs)}.quiz-progress-fill{height:100%;background:var(--color-primary);border-radius:var(--radius-full);transition:width .3s ease}.quiz-progress-text{text-align:center;font-size:var(--font-size-sm);color:var(--color-text-muted);margin-bottom:var(--spacing-md)}.quiz-question-card{padding:var(--spacing-lg)}.quiz-q{display:flex;flex-direction:column;gap:var(--spacing-md)}.quiz-type-badge{display:inline-block;padding:2px 10px;background:var(--color-primary-bg);color:var(--color-primary);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);width:fit-content}.quiz-q-text{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);line-height:1.5}.quiz-ox-options{display:flex;gap:var(--spacing-md)}.quiz-ox-btn{flex:1;padding:var(--spacing-md) var(--spacing-lg);border:2px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-secondary);font-size:var(--font-size-lg);cursor:pointer;transition:all .2s ease}.quiz-ox-btn:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-primary-bg)}.quiz-ox-selected{border-color:var(--color-primary);background:var(--color-primary-bg)}.quiz-ox-correct{border-color:var(--color-success)!important;background:#22c55e1a!important}.quiz-ox-wrong{border-color:var(--color-danger)!important;background:#ef44441a!important}.quiz-input-wrapper{display:flex;flex-direction:column;gap:var(--spacing-sm)}.quiz-context{font-size:var(--font-size-sm);color:var(--color-text-muted);font-style:italic;padding:var(--spacing-sm);background:var(--color-bg-tertiary);border-radius:var(--radius-md)}.quiz-text-input{padding:var(--spacing-sm) var(--spacing-md);border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-primary);color:var(--color-text-primary);font-size:var(--font-size-md);transition:border-color .2s ease}.quiz-text-input:focus{outline:none;border-color:var(--color-primary)}.quiz-text-input:disabled{opacity:.7}.quiz-matching{display:flex;flex-direction:column;gap:var(--spacing-sm)}.quiz-matching-row{display:flex;align-items:center;gap:var(--spacing-md)}.quiz-matching-term{flex:1;font-weight:var(--font-weight-medium);color:var(--color-text-primary)}.quiz-matching-select,.quiz-ordering-select{flex:1;padding:var(--spacing-xs) var(--spacing-sm);border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-primary);color:var(--color-text-primary);font-size:var(--font-size-sm)}.quiz-ordering{display:flex;flex-direction:column;gap:var(--spacing-sm)}.quiz-ordering-hint{font-size:var(--font-size-sm);color:var(--color-text-muted)}.quiz-ordering-row{display:flex;align-items:center;gap:var(--spacing-sm)}.quiz-ordering-num{font-weight:var(--font-weight-bold);color:var(--color-primary);min-width:24px}.quiz-feedback{padding:var(--spacing-md);border-radius:var(--radius-md);margin-top:var(--spacing-sm)}.quiz-feedback-correct{background:#22c55e1a;border:1px solid var(--color-success)}.quiz-feedback-wrong{background:#ef44441a;border:1px solid var(--color-danger)}.quiz-correct-answer{margin-top:var(--spacing-xs);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.quiz-explanation{margin-top:var(--spacing-xs);font-size:var(--font-size-sm);color:var(--color-text-muted);line-height:1.5}.quiz-nav{display:flex;justify-content:space-between;margin-top:var(--spacing-lg);gap:var(--spacing-md)}.quiz-result{margin-top:var(--spacing-lg)}.quiz-result-summary{text-align:center;padding:var(--spacing-xl)}.quiz-result-title{font-size:var(--font-size-xl);margin-bottom:var(--spacing-md)}.quiz-result-score{display:flex;align-items:baseline;justify-content:center;gap:var(--spacing-xs);margin-bottom:var(--spacing-sm)}.quiz-result-number{font-size:3rem;font-weight:var(--font-weight-bold);color:var(--color-primary)}.quiz-result-divider{font-size:1.5rem;color:var(--color-text-muted)}.quiz-result-total{font-size:1.5rem;color:var(--color-text-secondary)}.quiz-result-rate{font-size:var(--font-size-lg);color:var(--color-text-muted);margin-bottom:var(--spacing-lg)}.quiz-result-actions{display:flex;justify-content:center;gap:var(--spacing-md)}.quiz-review-card{margin-top:var(--spacing-sm);padding:var(--spacing-md)}.quiz-review-correct{border-left:3px solid var(--color-success)}.quiz-review-wrong{border-left:3px solid var(--color-danger)}.quiz-review-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xs);font-weight:var(--font-weight-semibold)}.practice-mode-select{margin-top:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.practice-mode-card{transition:all .2s ease}.practice-mode-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.practice-mode-content{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md)}.practice-mode-icon{font-size:2rem;flex-shrink:0}.practice-mode-info{flex:1}.practice-mode-title{font-size:var(--font-size-md);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin-bottom:4px}.practice-mode-desc{font-size:var(--font-size-sm);color:var(--color-text-muted);line-height:1.5}.practice-mode-arrow{font-size:var(--font-size-xl);color:var(--color-text-muted);flex-shrink:0}.practice-field-select{margin-top:var(--spacing-lg)}.practice-section-header{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.practice-section-header h3{font-size:var(--font-size-md);color:var(--color-text-primary)}.practice-group-title{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--color-text-secondary);margin:var(--spacing-lg) 0 var(--spacing-sm)}.practice-field-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:var(--spacing-sm)}.practice-field-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md);transition:all .2s ease}.practice-field-item:hover{transform:translateY(-1px);box-shadow:0 2px 8px #0000001a;border-color:var(--color-primary)}.practice-field-icon{font-size:1.2rem}.practice-field-label{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-primary)}.practice-question-guide{margin-top:var(--spacing-sm);font-size:var(--font-size-sm);color:var(--color-text-muted);line-height:1.5}.practice-original-card{padding:var(--spacing-md) var(--spacing-lg);border-left:3px solid var(--color-warning)}.practice-original-card h4{margin-bottom:var(--spacing-sm)}.practice-original-text{font-size:var(--font-size-sm);color:var(--color-text-secondary);line-height:1.7;white-space:pre-wrap}.practice-session{margin-top:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-lg)}.practice-question-card{padding:var(--spacing-lg)}.practice-question-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md)}.practice-question-type{display:inline-block;padding:2px 10px;background:var(--color-primary-bg);color:var(--color-primary);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold)}.practice-difficulty{display:inline-block;padding:2px 8px;border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium)}.practice-difficulty-easy{background:#22c55e1a;color:var(--color-success)}.practice-difficulty-medium{background:#eab3081a;color:var(--color-warning)}.practice-difficulty-hard{background:#ef44441a;color:var(--color-danger)}.practice-question-text{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);line-height:1.6}.practice-hints{margin-top:var(--spacing-md)}.practice-hints-toggle{background:none;border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--spacing-xs) var(--spacing-md);color:var(--color-text-secondary);cursor:pointer;font-size:var(--font-size-sm);transition:all .2s ease}.practice-hints-toggle:hover{background:var(--color-bg-tertiary)}.practice-hints-list{margin-top:var(--spacing-sm);padding-left:var(--spacing-lg);color:var(--color-text-secondary);font-size:var(--font-size-sm);line-height:1.6}.practice-keywords{margin-top:var(--spacing-md);display:flex;flex-wrap:wrap;align-items:center;gap:var(--spacing-sm)}.practice-keywords-label{font-size:var(--font-size-sm);color:var(--color-text-muted)}.practice-keywords-list{display:flex;flex-wrap:wrap;gap:var(--spacing-xs)}.practice-keyword-tag{display:inline-block;padding:2px 8px;background:var(--color-bg-tertiary);color:var(--color-text-secondary);border-radius:var(--radius-full);font-size:var(--font-size-xs)}.practice-keyword-missing{background:#ef44441a;color:var(--color-danger)}.practice-answer-card{padding:var(--spacing-lg)}.practice-answer-title{margin-bottom:var(--spacing-md);color:var(--color-text-primary)}.practice-textarea{width:100%;min-height:160px;padding:var(--spacing-md);border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-primary);color:var(--color-text-primary);font-family:inherit;font-size:var(--font-size-md);line-height:1.7;resize:vertical;transition:border-color .2s ease;box-sizing:border-box}.practice-textarea:focus{outline:none;border-color:var(--color-primary)}.practice-textarea::placeholder{color:var(--color-text-muted);opacity:.6}.practice-answer-footer{display:flex;justify-content:space-between;align-items:center;margin-top:var(--spacing-md)}.practice-char-count{font-size:var(--font-size-sm);color:var(--color-text-muted)}.practice-min-warning{font-size:var(--font-size-xs);color:var(--color-warning);margin-top:var(--spacing-xs)}.practice-evaluating-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-md);z-index:100;color:#fff;font-size:var(--font-size-lg)}.practice-result{margin-top:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.practice-score-card{text-align:center;padding:var(--spacing-xl)}.practice-result-title{font-size:var(--font-size-xl);margin-bottom:var(--spacing-md)}.practice-score-main{display:flex;align-items:baseline;justify-content:center;gap:var(--spacing-xs)}.practice-score-number{font-size:3.5rem;font-weight:var(--font-weight-bold)}.practice-score-max{font-size:1.5rem;color:var(--color-text-muted)}.practice-score-label{display:block;font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);margin-bottom:var(--spacing-lg)}.practice-score-breakdown{text-align:left;max-width:400px;margin:0 auto var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.practice-score-item{display:flex;flex-direction:column;gap:4px}.practice-score-item-header{display:flex;justify-content:space-between;align-items:center}.practice-score-item-label{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.practice-score-item-value{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--color-text-primary)}.practice-score-bar{height:8px;background:var(--color-bg-tertiary);border-radius:var(--radius-full);overflow:hidden}.practice-score-bar-fill{height:100%;border-radius:var(--radius-full);transition:width .5s ease}.practice-score-item-comment{font-size:var(--font-size-xs);color:var(--color-text-muted);line-height:1.4}.practice-result-actions{display:flex;justify-content:center;gap:var(--spacing-md);margin-top:var(--spacing-md)}.practice-feedback-card{padding:var(--spacing-md) var(--spacing-lg)}.practice-feedback-card h4{margin-bottom:var(--spacing-sm);font-size:var(--font-size-md)}.practice-feedback-card ul{padding-left:var(--spacing-lg);margin:0}.practice-feedback-card li{margin-bottom:var(--spacing-xs);font-size:var(--font-size-sm);color:var(--color-text-secondary);line-height:1.5}.practice-feedback-good{border-left:3px solid var(--color-success)}.practice-feedback-weak{border-left:3px solid var(--color-danger)}.practice-feedback-improve{border-left:3px solid var(--color-info)}.practice-missing-keywords{display:flex;flex-wrap:wrap;gap:var(--spacing-xs);margin-top:var(--spacing-sm)}.practice-model-card{padding:var(--spacing-md) var(--spacing-lg);border-left:3px solid var(--color-primary)}.practice-model-card h4{margin-bottom:var(--spacing-sm)}.practice-model-text{font-size:var(--font-size-sm);color:var(--color-text-secondary);line-height:1.7;white-space:pre-wrap}.practice-my-answer-card{padding:var(--spacing-md) var(--spacing-lg);opacity:.8}.practice-my-answer-card h4{margin-bottom:var(--spacing-sm)}.practice-my-answer-text{font-size:var(--font-size-sm);color:var(--color-text-muted);line-height:1.7;white-space:pre-wrap}.analytics-two-col{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.analytics-calendar{overflow-x:auto;padding:var(--spacing-sm) 0}.analytics-calendar-cell:hover{opacity:.8}.analytics-accuracy-row{padding:var(--spacing-xs) 0}.analytics-accuracy-label{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-xs);font-size:var(--font-size-sm)}.analytics-accuracy-name{flex:1;color:var(--color-text)}.analytics-accuracy-value{font-size:var(--font-size-xs);color:var(--color-text-muted)}.analytics-accuracy-bar{height:8px;background:var(--color-bg-elevated);border-radius:var(--radius-full);overflow:hidden}.analytics-accuracy-fill{height:100%;border-radius:var(--radius-full);transition:width .5s ease;min-width:2px}.analytics-mastery-stack{display:flex;height:24px;border-radius:var(--radius-full);overflow:hidden;background:var(--color-bg-elevated);margin-bottom:var(--spacing-md)}.analytics-mastery-segment{height:100%;transition:width .5s ease;min-width:2px}.analytics-mastery-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.analytics-mastery-item{display:flex;align-items:center;gap:var(--spacing-sm)}.analytics-mastery-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.analytics-mastery-info{flex:1;display:flex;justify-content:space-between;align-items:center;font-size:var(--font-size-sm)}.analytics-stage-row{padding:var(--spacing-xs) 0}.analytics-stage-label{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-xs);font-size:var(--font-size-sm)}.analytics-stage-name{flex:1;color:var(--color-text)}.analytics-stage-count{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--color-text-muted)}.analytics-stage-bar{display:flex;height:16px;border-radius:var(--radius-full);overflow:hidden;background:var(--color-bg-elevated)}.analytics-stage-segment{height:100%;transition:width .5s ease;min-width:2px}.fc-stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.fc-stat-card{display:flex;flex-direction:column;align-items:center;padding:var(--spacing-md);background:var(--bg-primary);border:1px solid var(--color-border);border-radius:var(--radius-md)}.fc-stat-value{font-size:1.75rem;font-weight:700;color:var(--color-text-primary)}.fc-stat-due .fc-stat-value{color:var(--color-warning)}.fc-stat-mastered .fc-stat-value{color:var(--color-success)}.fc-stat-label{font-size:var(--font-size-sm);color:var(--color-text-muted);margin-top:2px}.fc-review-cta{margin-bottom:var(--spacing-lg);border-left:4px solid var(--color-primary)}.fc-review-cta-content{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md)}.fc-review-cta-left{display:flex;align-items:center;gap:var(--spacing-md)}.fc-review-cta-icon{font-size:1.5rem}.fc-review-cta-title{margin:0;font-size:var(--font-size-md);font-weight:600}.fc-review-cta-desc{margin:2px 0 0;font-size:var(--font-size-sm);color:var(--color-text-muted)}.fc-section{margin-bottom:var(--spacing-xl)}.fc-section-title{font-size:var(--font-size-lg);margin:0 0 var(--spacing-md)}.fc-section-desc{color:var(--color-text-muted);font-size:var(--font-size-sm);margin:0 0 var(--spacing-md)}.fc-deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:var(--spacing-md)}.fc-deck-card{position:relative;display:flex;flex-direction:column;gap:var(--spacing-xs)}.fc-deck-card-new{border-style:dashed}.fc-deck-delete{position:absolute;top:var(--spacing-sm);right:var(--spacing-sm);background:none;border:none;color:var(--color-text-muted);cursor:pointer;font-size:1.1rem;padding:2px 6px;border-radius:var(--radius-sm);line-height:1}.fc-deck-delete:hover{color:var(--color-danger);background:var(--color-bg-hover)}.fc-deck-title{font-size:var(--font-size-md);font-weight:600;margin:0;padding-right:var(--spacing-lg);line-height:1.4}.fc-deck-meta{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--font-size-sm);color:var(--color-text-muted)}.fc-deck-due-badge{display:inline-block;padding:1px 8px;border-radius:var(--radius-full);background:color-mix(in srgb,var(--color-warning) 15%,transparent);color:var(--color-warning);font-size:var(--font-size-xs);font-weight:500}.fc-deck-done-badge{display:inline-block;padding:1px 8px;border-radius:var(--radius-full);background:color-mix(in srgb,var(--color-success) 15%,transparent);color:var(--color-success);font-size:var(--font-size-xs);font-weight:500}.fc-deck-progress{height:4px;border-radius:var(--radius-full);background:var(--color-bg-hover);overflow:hidden;margin:var(--spacing-xs) 0}.fc-deck-progress-fill{height:100%;background:var(--color-success);border-radius:var(--radius-full);transition:width .3s ease}.fc-deck-status{font-size:var(--font-size-sm);color:var(--color-text-muted);margin:0 0 var(--spacing-sm)}.fc-deck-actions{display:flex;gap:var(--spacing-xs);margin-top:var(--spacing-xs)}.fc-empty-state{text-align:center;padding:var(--spacing-2xl)}.fc-empty-icon{font-size:3rem;margin-bottom:var(--spacing-md)}.fc-empty-title{margin:0 0 var(--spacing-sm)}.fc-empty-desc{color:var(--color-text-muted);margin:0 0 var(--spacing-lg)}.fcs-topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.fcs-counter{font-size:var(--font-size-sm);color:var(--color-text-muted);font-weight:500}.fcs-progress{height:6px;border-radius:var(--radius-full);background:var(--color-bg-hover);margin-bottom:var(--spacing-lg);overflow:hidden}.fcs-progress-fill{height:100%;background:var(--color-primary);border-radius:var(--radius-full);transition:width .3s ease}.fcs-topic-label{text-align:center;color:var(--color-text-muted);font-size:var(--font-size-sm);margin:0 0 var(--spacing-sm)}.fcs-card-container{perspective:1000px;width:100%;max-width:560px;margin:0 auto;min-height:280px;cursor:pointer}.fcs-card-inner{position:relative;width:100%;min-height:280px;transition:transform .5s ease;transform-style:preserve-3d}.fcs-card-flipped{transform:rotateY(180deg)}.fcs-card-face{position:absolute;top:0;left:0;width:100%;min-height:280px;backface-visibility:hidden;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:var(--spacing-xl) var(--spacing-lg);border-radius:var(--radius-lg);border:2px solid 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