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var(--transition-fast);text-align:left}.week-header:hover{background-color:var(--bg-tertiary)}.week-title-wrap{display:flex;flex-direction:column;flex:1}.week-label{font-size:10px;text-transform:uppercase;font-weight:var(--font-weight-bold);color:var(--text-muted)}.week-title{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--text-primary)}.week-progress-badge{font-size:11px;font-weight:var(--font-weight-medium);color:var(--text-secondary);background-color:var(--bg-tertiary);padding:1px 6px;border-radius:var(--radius-sm);margin-right:var(--spacing-2)}.week-chevron{transition:transform var(--transition-base);color:var(--text-muted)}.week-header[aria-expanded=true] .week-chevron{transform:rotate(180deg)}.week-content{max-height:0;overflow:hidden;transition:max-height .3s ease-out;background-color:rgba(255,255,255,.3)}[data-theme=dark] .week-content{background-color:rgba(0,0,0,.1)}.week-header[aria-expanded=true]+.week-content{max-height:2e3px}.nav-day-item{display:flex;align-items:flex-start;gap:var(--spacing-3);padding:var(--spacing-2)var(--spacing-4)var(--spacing-2)calc(var(--spacing-4) + 4px);text-decoration:none;transition:all var(--transition-fast);border-left:2px solid transparent}.nav-day-item:hover{background-color:var(--bg-tertiary)}.nav-day-item.active{background-color:var(--color-primary-light);border-left-color:var(--color-primary)}[data-theme=dark] .nav-day-item.active{background-color:rgba(99,102,241,.1)}.nav-day-status-icon{width:14px;height:14px;border-radius:50%;border:1.5px solid var(--border-color-strong);margin-top:3px;flex-shrink:0;position:relative}.nav-day-item[data-status=completed] .nav-day-status-icon{background-color:var(--color-success);border-color:var(--color-success)}.nav-day-item[data-status=completed] .nav-day-status-icon::after{content:"";position:absolute;top:2px;left:4px;width:3px;height:6px;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}.nav-day-item[data-status=in-progress] .nav-day-status-icon{border-color:var(--color-warning);border-width:3px}.nav-day-item[data-status=available] .nav-day-status-icon{border-color:var(--color-available)}.nav-day-info{display:flex;flex-direction:column}.nav-day-label{font-size:10px;font-weight:var(--font-weight-bold);color:var(--text-muted)}.nav-day-title{font-size:var(--font-size-sm);color:var(--text-secondary)}.nav-day-item.active .nav-day-title{color:var(--text-primary);font-weight:var(--font-weight-medium)}.sidebar-footer{padding:var(--spacing-3)var(--spacing-4);border-top:1px solid var(--border-color);background-color:var(--bg-primary)}.sidebar-contributor{display:flex;align-items:center;gap:var(--spacing-2);margin-bottom:var(--spacing-4);padding-bottom:var(--spacing-3);border-bottom:1px solid var(--bg-tertiary)}.contributor-avatar-sm{width:28px;height:28px;border-radius:50%;border:1px solid var(--border-color)}.contributor-info{display:flex;flex-direction:column;line-height:1.2}.contributor-label{font-size:10px;text-transform:uppercase;font-weight:var(--font-weight-bold);color:var(--text-muted)}.contributor-name-sm{font-size:12px;font-weight:var(--font-weight-semibold);color:var(--text-primary)}.sidebar-actions{display:flex;gap:var(--spacing-2)}.sidebar-action-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:var(--spacing-1);padding:var(--spacing-2);background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:var(--font-size-xs);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.sidebar-action-btn:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.mobile-progress-nav{position:fixed;bottom:0;left:0;right:0;background-color:var(--bg-elevated);box-shadow:0 -4px 12px rgba(0,0,0,.1);z-index:calc(var(--z-fixed) + 10);display:none}@media(max-width:1023px){.mobile-progress-nav{display:block}}.mobile-progress-track{height:4px;background-color:var(--bg-tertiary)}.mobile-progress-fill{height:100%;background-color:var(--color-success);transition:width var(--transition-slow)}.mobile-nav-content{display:flex;align-items:center;justify-content:center;padding:var(--spacing-3)var(--spacing-4)}.mobile-progress-info{display:flex;flex-direction:column;text-align:center}.mobile-progress-percent{font-size:13px;font-weight:var(--font-weight-bold);color:var(--text-primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-2);padding:var(--spacing-3)var(--spacing-5);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);border-radius:var(--radius-lg);transition:all var(--transition-fast);cursor:pointer;white-space:nowrap}.btn--primary{background-color:var(--color-primary);color:#fff}.btn--primary:hover{background-color:var(--color-primary-hover)}.btn--secondary{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color)}.btn--secondary:hover{background-color:var(--bg-tertiary);border-color:var(--border-color-strong)}.btn--success{background-color:var(--color-success);color:#fff}.btn--success:hover{background-color:#16a34a}.btn--danger{background-color:var(--color-error);color:#fff}.btn--danger:hover{background-color:#dc2626}.btn--ghost{background-color:initial;color:var(--text-secondary)}.btn--ghost:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.btn--sm{padding:var(--spacing-2)var(--spacing-3);font-size:var(--font-size-xs)}.btn--lg{padding:var(--spacing-4)var(--spacing-6);font-size:var(--font-size-base)}.btn:disabled{opacity:.5;cursor:not-allowed}.course-hero-actions{margin-top:var(--spacing-6);display:flex;gap:var(--spacing-4)}.resume-btn{display:inline-flex;align-items:center;gap:var(--spacing-3);padding:var(--spacing-4)var(--spacing-8);background-color:var(--color-primary);color:#fff;border-radius:var(--radius-full);text-decoration:none;font-weight:var(--font-weight-bold);font-size:var(--font-size-base);box-shadow:0 4px 14px rgba(99,102,241,.4);transition:all var(--transition-base)}.resume-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(99,102,241,.5);background-color:var(--color-primary-hover)}.course-info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:var(--spacing-8);margin-top:var(--spacing-10)}.course-contributor{display:flex;align-items:center;gap:var(--spacing-3);margin-top:var(--spacing-4);padding:var(--spacing-3);background-color:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border-color);width:fit-content}.contributor-avatar{width:40px;height:40px;border-radius:50%;border:2px solid var(--bg-primary);box-shadow:var(--shadow-sm)}.contributor-details{display:flex;flex-direction:column;line-height:1.2}.contributor-label{font-size:10px;text-transform:uppercase;font-weight:var(--font-weight-bold);color:var(--text-muted)}.contributor-name{font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);color:var(--text-primary)}.modal{position:fixed;inset:0;z-index:var(--z-modal);display:flex;align-items:center;justify-content:center;padding:var(--spacing-4)}.modal-backdrop{position:absolute;inset:0;background-color:rgba(0,0,0,.5);backdrop-filter:blur(4px)}.modal-content{position:relative;width:100%;max-width:480px;max-height:90vh;background-color:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);overflow:hidden;display:flex;flex-direction:column}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-4)var(--spacing-6);border-bottom:1px solid 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var(--border-color);border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--text-primary);transition:all var(--transition-fast)}.settings-btn:hover{background-color:var(--bg-tertiary);border-color:var(--border-color-strong)}.settings-btn--danger{border-color:var(--color-error);color:var(--color-error)}.settings-btn--danger:hover{background-color:var(--color-error-light)}.settings-option-hint{font-size:var(--font-size-xs);color:var(--text-muted);margin-top:var(--spacing-2)}.toast-container{position:fixed;bottom:var(--spacing-6);right:var(--spacing-6);z-index:var(--z-toast);display:flex;flex-direction:column;gap:var(--spacing-3)}.toast{display:flex;align-items:center;gap:var(--spacing-3);padding:var(--spacing-4);background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);min-width:300px;max-width:400px;animation:slideIn .3s ease}@keyframes 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0}.code-block-filename{font-family:var(--font-mono);font-size:var(--font-size-sm);color:var(--text-secondary)}.code-block-copy{display:flex;align-items:center;gap:var(--spacing-1);padding:var(--spacing-1)var(--spacing-2);font-size:var(--font-size-xs);color:var(--text-secondary);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.code-block-copy:hover{background-color:var(--bg-secondary);color:var(--text-primary)}.code-block-copy.copied{color:var(--color-success)}.code-block pre{margin-top:0;border-top-left-radius:0;border-top-right-radius:0}.prose pre{position:relative}.copy-btn{position:absolute;top:var(--spacing-2);right:var(--spacing-2);display:flex;align-items:center;gap:var(--spacing-1);padding:var(--spacing-1)var(--spacing-2);background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:var(--font-size-xs);color:var(--text-secondary);opacity:0;transition:all var(--transition-fast)}.prose pre:hover .copy-btn{opacity:1}.copy-btn:hover{background-color:var(--bg-primary);color:var(--text-primary)}.copy-btn.copied{color:var(--color-success);border-color:var(--color-success)}.badge{display:inline-flex;align-items:center;padding:var(--spacing-1)var(--spacing-2);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);border-radius:var(--radius-full)}.badge--primary{background-color:var(--color-primary-light);color:var(--color-primary-dark)}.badge--success{background-color:var(--color-success-light);color:#166534}.badge--warning{background-color:var(--color-warning-light);color:#92400e}.badge--error{background-color:var(--color-error-light);color:#991b1b}.skeleton{background:linear-gradient( 90deg,var(--bg-tertiary) 25%,var(--bg-secondary) 50%,var(--bg-tertiary) 75% );background-size:200% 100%;animation:skeleton-loading 1.5s infinite;border-radius:var(--radius-md)}@keyframes skeleton-loading{0%{background-position:200% 0}100%{background-position:-200% 0}}.skeleton-text{height:1em;margin-bottom:var(--spacing-2)}.skeleton-title{height:1.5em;width:60%;margin-bottom:var(--spacing-4)}.tooltip{position:relative}.tooltip::after{content:attr(data-tooltip);position:absolute;bottom:100%;left:50%;transform:translateX(-50%);padding:var(--spacing-1)var(--spacing-2);background-color:var(--text-primary);color:var(--bg-primary);font-size:var(--font-size-xs);white-space:nowrap;border-radius:var(--radius-sm);opacity:0;visibility:hidden;transition:all var(--transition-fast);pointer-events:none;z-index:var(--z-tooltip)}.tooltip:hover::after{opacity:1;visibility:visible;transform:translateX(-50%)translateY(-4px)}.back-to-top{position:fixed;bottom:var(--spacing-8);right:var(--spacing-8);width:48px;height:48px;background-color:var(--color-primary);color:#fff;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-lg);cursor:pointer;z-index:var(--z-fixed);transition:all var(--transition-base);opacity:0;visibility:hidden;transform:translateY(20px);border:none}.back-to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background-color:var(--color-primary-hover);transform:translateY(-4px);box-shadow:var(--shadow-xl)}@media(max-width:768px){.back-to-top{bottom:var(--spacing-20);right:var(--spacing-4);width:40px;height:40px}}.quiz-section{margin-top:var(--spacing-10);padding-top:var(--spacing-8);border-top:1px solid var(--border-color)}.quiz-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);margin-bottom:var(--spacing-2)}.quiz-description{color:var(--text-secondary);margin-bottom:var(--spacing-6)}.quiz-container{background-color:var(--bg-secondary);border-radius:var(--radius-xl);padding:var(--spacing-6);border:1px solid var(--border-color)}.quiz-loading{text-align:center;padding:var(--spacing-8);color:var(--text-secondary)}.quiz-progress{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-6);padding-bottom:var(--spacing-4);border-bottom:1px solid var(--border-color)}.quiz-progress-info{display:flex;align-items:center;gap:var(--spacing-4)}.quiz-progress-text{font-size:var(--font-size-sm);color:var(--text-secondary)}.quiz-progress-text strong{color:var(--text-primary);font-weight:var(--font-weight-semibold)}.quiz-score{display:flex;align-items:center;gap:var(--spacing-2);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.quiz-score--passing{color:var(--color-success)}.quiz-score--failing{color:var(--color-error)}.quiz-question{margin-bottom:var(--spacing-6);padding-bottom:var(--spacing-6);border-bottom:1px solid var(--border-color)}.quiz-question:last-of-type{margin-bottom:0;padding-bottom:0;border-bottom:none}.question-header{display:flex;align-items:flex-start;gap:var(--spacing-3);margin-bottom:var(--spacing-4)}.question-number{flex-shrink:0;width:28px;height:28px;display:flex;align-items:center;justify-content:center;background-color:var(--color-primary);color:#fff;font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);border-radius:var(--radius-full)}.question-text{font-size:var(--font-size-base);font-weight:var(--font-weight-medium);color:var(--text-primary);line-height:var(--line-height-relaxed)}.question-type{font-size:var(--font-size-xs);color:var(--text-muted);margin-top:var(--spacing-1)}.question-options{display:flex;flex-direction:column;gap:var(--spacing-3);margin-bottom:var(--spacing-4)}.question-option{display:flex;align-items:flex-start;gap:var(--spacing-3);padding:var(--spacing-3)var(--spacing-4);background-color:var(--bg-primary);border:2px solid var(--border-color);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast)}.question-option:hover:not(.is-disabled){border-color:var(--color-primary);background-color:var(--color-primary-light)}.question-option.is-selected{border-color:var(--color-primary);background-color:var(--color-primary-light)}.question-option.is-correct{border-color:var(--color-success);background-color:var(--color-success-light)}.question-option.is-incorrect{border-color:var(--color-error);background-color:var(--color-error-light)}.question-option.is-disabled{cursor:not-allowed;opacity:.7}.option-checkbox{flex-shrink:0;width:20px;height:20px;border:2px solid var(--border-color-strong);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.question-option.is-selected .option-checkbox{background-color:var(--color-primary);border-color:var(--color-primary)}.question-option.is-selected .option-checkbox::after{content:'';width:6px;height:10px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg);margin-bottom:2px}.question-option.is-correct .option-checkbox{background-color:var(--color-success);border-color:var(--color-success)}.question-option.is-incorrect .option-checkbox{background-color:var(--color-error);border-color:var(--color-error)}.question-option.is-incorrect .option-checkbox::after{content:'\00d7';color:#fff;font-size:16px;font-weight:700;line-height:1}.option-text{flex:1;font-size:var(--font-size-sm);color:var(--text-primary);line-height:var(--line-height-normal)}.drag-drop-container{margin-bottom:var(--spacing-4)}.drag-drop-list{display:flex;flex-direction:column;gap:var(--spacing-2)}.drag-drop-item{display:flex;align-items:center;gap:var(--spacing-3);padding:var(--spacing-3)var(--spacing-4);background-color:var(--bg-primary);border:2px solid var(--border-color);border-radius:var(--radius-lg);cursor:grab;transition:all var(--transition-fast);user-select:none}.drag-drop-item:hover:not(.is-disabled){border-color:var(--color-primary);box-shadow:var(--shadow-sm)}.drag-drop-item.is-dragging{opacity:.5;border-style:dashed}.drag-drop-item.is-over{border-color:var(--color-primary);background-color:var(--color-primary-light)}.drag-drop-item.is-correct{border-color:var(--color-success);background-color:var(--color-success-light)}.drag-drop-item.is-incorrect{border-color:var(--color-error);background-color:var(--color-error-light)}.drag-drop-item.is-disabled{cursor:not-allowed}.drag-handle{flex-shrink:0;color:var(--text-muted);cursor:grab}.drag-handle:active{cursor:grabbing}.drag-number{flex-shrink:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center;background-color:var(--bg-tertiary);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--text-secondary)}.drag-drop-item.is-correct 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