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0.1)}*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif;background-color:var(--background-color)}#course-view-container{height:100%;display:grid;grid-template-rows:var(--header-height) 1fr var(--control-bar-height,60px);grid-template-areas:"header" "main" "controls"}#main-layout{display:grid;grid-template-columns:var(--sidebar-width) 1fr var(--sidebar-width);grid-template-areas:"left-sidebar content right-sidebar";height:calc(100vh - var(--header-height) - var(--control-bar-height,60px));overflow:hidden;transition:all .3s ease;position:relative}#main-layout.content-only{grid-template-columns:1fr!important;grid-template-areas:"content"!important}#main-layout.content-only #left-sidebar,#main-layout.content-only #right-sidebar{display:none!important;width:0!important;min-width:0!important;padding:0!important;margin:0!important;border:none!important}body.content-only-layout #bottom-control-bar{display:none!important}body.content-only-layout #course-view-container{grid-template-rows:var(--header-height) 1fr;grid-template-areas:"header" "main"}body.content-only-layout #main-layout{height:calc(100vh - var(--header-height))}#main-layout.left-collapsed{grid-template-columns:0 1fr var(--sidebar-width)}#main-layout.right-collapsed{grid-template-columns:var(--sidebar-width) 1fr 0}#main-layout.left-collapsed.right-collapsed{grid-template-columns:0 1fr 0}#left-sidebar.collapsed,#right-sidebar.collapsed{width:0!important;min-width:0!important;padding:0!important;overflow:hidden;margin:0;border:none}#content-area{grid-area:content;overflow-y:auto;padding:0;background-color:var(--content-bg);transition:all .3s ease;min-width:0;min-height:0;width:100%;margin:0;display:block;position:relative;z-index:1}#main-layout.content-only #content-area{width:100%!important;min-width:0!important;margin:0!important}#main-layout.left-collapsed #content-area{margin-left:0}#main-layout.right-collapsed #content-area{margin-right:0}.resizing{user-select:none;pointer-events:none}body.resizing{cursor:col-resize!important}.sidebar.collapsed .sidebar-resize-handle{display:none}#lesson-content{padding:calc(var(--spacing-md) + 20px);max-width:1000px;margin:0 auto;min-height:200px;width:100%;box-sizing:border-box}.lesson-content{max-width:700px}.notes-placeholder{color:var(--text-secondary);font-style:italic;text-align:center;padding:calc(var(--spacing-md) + 20px)}.loading{opacity:.6;pointer-events:none}.fade-in{animation:fadeIn .3s ease-in}[data-theme=dark] .nav-lesson:hover{background:var(--nav-hover-bg)}[data-theme=dark] .nav-lesson.current{background-color:var(--nav-active-bg);border:1px solid var(--nav-active-border);color:var(--text-primary)}[data-theme=dark] .module-lessons{border-color:rgba(255,255,255,.15)}[data-theme=dark] .toggle-icon{color:var(--text-secondary)}@media (max-width:1024px){#main-layout{grid-template-columns:minmax(200px,250px) 1fr minmax(200px,250px)}#main-layout.left-collapsed{grid-template-columns:0 1fr minmax(200px,250px)}#main-layout.right-collapsed{grid-template-columns:minmax(200px,250px) 1fr 0}#main-layout.left-collapsed.right-collapsed{grid-template-columns:0 1fr 0}#left-sidebar,#right-sidebar{min-width:200px;overflow-x:hidden}}@media (max-width:900px){#main-layout{grid-template-columns:minmax(200px,250px) 1fr 0;grid-template-areas:"left-sidebar content right-sidebar"}#main-layout.left-collapsed{grid-template-columns:0 1fr 0}#content-area{min-width:0;width:100%;grid-area:content}#right-sidebar{position:fixed;top:var(--header-height);right:0;height:calc(100vh - var(--header-height) - var(--control-bar-height));width:var(--sidebar-width);z-index:1100;transform:translateX(100%);box-shadow:-2px 0 10px rgba(0,0,0,.2)}#right-sidebar:not(.collapsed){transform:translateX(0)}#main-layout.content-only #right-sidebar{transform:none!important;position:static!important;box-shadow:none!important}}@media (max-width:768px){#main-layout{grid-template-columns:1fr;grid-template-areas:"content";height:calc(100vh - var(--header-height) - var(--control-bar-height))}#main-layout.left-collapsed,#main-layout.left-collapsed.right-collapsed,#main-layout.right-collapsed{grid-template-columns:1fr;grid-template-areas:"content"}#content-area{grid-area:content;width:100%!important;min-width:0!important;padding:0;display:block!important}#left-sidebar{position:fixed;top:var(--header-height);left:0;height:calc(100vh - var(--header-height) - var(--control-bar-height));width:var(--sidebar-width);min-width:250px;max-width:85vw;z-index:1100;transform:translateX(-100%);box-shadow:2px 0 10px rgba(0,0,0,.2);overflow-y:auto;overflow-x:hidden}#left-sidebar:not(.collapsed){transform:translateX(0)}#right-sidebar{z-index:1100;min-width:250px;max-width:85vw}#main-layout.content-only #left-sidebar{transform:none!important;position:static!important;box-shadow:none!important}.control-bar-container{padding:0 var(--spacing-sm)}.lesson-controls{gap:var(--spacing-xs)}}@media (max-width:480px){.control-bar-container{padding:0 var(--spacing-xs)}.lesson-controls{gap:.25rem}#complete-lesson-btn{padding:var(--spacing-xs);font-size:.875rem}#complete-lesson-btn .btn-text{display:none}#complete-lesson-btn::after{content:attr(aria-label);position:absolute;top:-2.5rem;left:50%;transform:translateX(-50%);background:var(--text-primary);color:var(--background-color);padding:.25rem .5rem;border-radius:.25rem;font-size:.75rem;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .2s ease}#complete-lesson-btn:hover::after{opacity:1}}@media (max-width:1200px){#content-area{min-width:0!important;flex:1}}@media (max-width:480px){#content-area{width:100vw!important;min-width:100vw!important;max-width:100vw!important}#lesson-content{padding:var(--spacing-sm);max-width:none}}@media (max-width:768px){#content-area{display:block!important;visibility:visible!important;opacity:1!important;width:100%!important;min-width:0!important;grid-area:content!important}#main-layout{width:100%!important;min-width:100%!important;grid-template-columns:1fr!important;grid-template-areas:"content"!important}#left-sidebar,#right-sidebar{position:fixed!important;z-index:100!important}#main-layout.content-only{grid-template-columns:1fr!important;grid-template-areas:"content"!important}#main-layout.content-only #content-area{display:block!important;width:100%!important}}@keyframes content-fade-in{0%{opacity:0;transform:translateY(10px)}100%{opacity:1;transform:translateY(0)}}@keyframes fadeIn{from{opacity:0}to{opacity:1}}.module-view{max-width:960px;margin:0 auto;padding:var(--spacing-lg) var(--spacing-md);overflow-x:hidden;background-color:var(--content-bg)}.module-view .module-view-header{text-align:center;margin-bottom:var(--spacing-md);position:relative}.module-view .module-status{display:inline-block;margin-bottom:var(--spacing-sm)}.module-view .module-status.completed{color:var(--success-color);background-color:rgba(0,205,0,.05);box-shadow:0 0 8px 1px rgba(0,205,0,.1);border-radius:6px;padding:.1rem .4rem;font-weight:400}.module-view .module-status.in-progress{color:#ff9800;background-color:rgba(255,152,0,.05);box-shadow:0 0 8px 1px rgba(255,152,0,.1);border-radius:6px;padding:.1rem .4rem;font-weight:400}.module-view .module-status.not-started{color:var(--text-muted-color);font-weight:500}.module-view .module-view-title{margin-bottom:var(--spacing-md);color:var(--text-primary);line-height:2rem;font-size:var(--text-xxl);letter-spacing:var(--ls-base)}.module-view .module-prefix{color:var(--text-muted-color)}.module-view .module-view-description{margin-bottom:var(--spacing-lg);padding:var(--spacing-md);background:var(--sidebar-bg);border-radius:var(--border-radius);box-shadow:0 2px 4px rgba(0,0,0,.05)}.module-view .module-view-description h2{font-size:1.5rem;font-weight:600;margin-bottom:var(--spacing-sm);color:var(--text-primary);padding-bottom:var(--spacing-xs)}.module-view .module-description-content{line-height:1.7;color:var(--text-secondary);font-size:1rem}.module-view .module-view-actions{display:flex;justify-content:center;gap:10px;margin-bottom:var(--spacing-md);flex-wrap:wrap}.module-view .module-view-actions .bttn{min-height:47px;min-width:47px;padding:.8rem 1rem;font-size:var(--text-base)}.module-view .module-view-actions .restart-module-btn:hover{color:#ff2626;background-color:rgba(255,38,38,.1);border-color:rgba(255,38,38,.2)}.module-view .module-action-buttons{display:flex;gap:var(--spacing-xs)}.module-view .module-view-lessons{margin-top:5rem}.module-view .lessons-section-title{display:block;font-size:var(--text-lg);font-weight:400;margin-bottom:var(--spacing-md);color:var(--text-tertiary-color);letter-spacing:var(--ls-base);text-align:left}.module-view .lessons-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.module-view .module-view-lesson{position:relative;border-radius:12px;padding:var(--spacing-md);display:grid;grid-template-columns:auto 1fr auto;grid-template-areas:"number content actions";gap:var(--spacing-sm) var(--spacing-md);align-items:center;box-shadow:0 0 0 1px var(--shadow-border);overflow:hidden;z-index:0}.module-view .module-view-lesson::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;z-index:-1;transition:opacity .8s ease;opacity:0;pointer-events:none}.module-view .module-view-lesson.completed{background:linear-gradient(120deg,rgba(0,175,0,.1) 10%,transparent 75%);border-left:2px solid var(--success-color)}.module-view .module-view-lesson.completed::before{background:linear-gradient(120deg,rgba(0,175,0,.1) 25%,transparent 100%)}.module-view .module-view-lesson.completed:hover::before{opacity:1}.module-view .module-view-lesson.started{background:linear-gradient(120deg,rgba(251,191,36,.1) 10%,transparent 75%);border-left:2px solid #fbbf24}.module-view .module-view-lesson.started::before{background:linear-gradient(120deg,rgba(251,191,36,.1) 25%,transparent 100%)}.module-view .module-view-lesson.started:hover::before{opacity:1}.module-view .module-view-lesson.not-started{background:linear-gradient(120deg,rgba(0,114,255,.1) 10%,transparent 75%);border-left:2px solid #0072ff}.module-view .module-view-lesson.not-started::before{background:linear-gradient(120deg,rgba(0,114,255,.1) 25%,transparent 100%)}.module-view .module-view-lesson.not-started:hover::before{opacity:1}.module-view .lesson-number{grid-area:number;width:38px;height:38px;background:var(--primary-color);border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:500;font-size:var(--text-lg);color:#fff;flex-shrink:0;box-shadow:0 2px 4px rgba(0,0,0,.1);align-self:center}.module-view .module-view-lesson.completed .lesson-number{background:var(--success-color)}.module-view .module-view-lesson.started .lesson-number{background:#fbbf24}.module-view .lesson-content{grid-area:content;min-width:0;display:flex;flex-direction:column;justify-content:center}.module-view .lesson-title{font-size:var(--text-lg);font-weight:500;color:var(--text-primary);line-height:1.8}.module-view .lesson-description{line-height:1.6;color:var(--text-tertiary-color);font-size:var(--text-base);margin-bottom:0}.module-view .lesson-description .expand-btn{display:inline-flex;padding:.25rem .6rem;border-radius:10px}.module-view .lesson-description .expand-btn:hover{background-color:var(--hover-50)}.module-view .lesson-description .expand-btn.expanded svg{transform:rotate(180deg)}.module-view .lesson-description .description-text{text-decoration:none}.module-view .lesson-status{display:flex;align-items:center;letter-spacing:var(--ls-lg);gap:var(--spacing-xs);font-size:var(--text-xs);color:var(--text-secondary);text-transform:uppercase;font-weight:400;margin-bottom:1rem}.module-view .lesson-status .status-badge{display:flex;align-items:center;gap:var(--spacing-xs);border-radius:6px;padding:.2rem .4rem;font-weight:400}.module-view .lesson-status .status-badge svg{width:.8rem;height:.8rem}.module-view .lesson-status .status-badge.completed{color:var(--success-color);background-color:rgba(0,205,0,.05);box-shadow:0 0 1px 1px rgba(0,205,0,.1)}.module-view .lesson-status .status-badge.in-progress{color:#ff9800;background-color:rgba(255,152,0,.05);box-shadow:0 0 1px 1px rgba(255,152,0,.1)}.module-view .lesson-status .status-badge.not-started{color:#0072ff;background-color:rgb(0,114,255,.05);box-shadow:0 0 1px 1px rgb(0,114,255,.1)}.module-view .lesson-actions{grid-area:actions;flex-shrink:0;justify-self:end;align-self:center;display:flex;gap:var(--spacing-xs)}.module-view .lesson-actions .start-lesson-btn{padding-left:1.5rem;padding-right:1.5rem;font-size:var(--text-base)}@media (max-width:768px){.module-view .module-view{padding:var(--spacing-md) var(--spacing-sm)}.module-view .module-view-title{font-size:1.875rem}.module-view .module-view-lesson{grid-template-columns:auto 1fr;grid-template-areas:"number content" ". actions"}.module-view .lesson-number{align-self:center}.module-view .lesson-actions{justify-self:stretch;justify-content:center}}@media (max-width:480px){.module-view .module-view-title{font-size:1.6rem}.module-view .module-view-description{padding:var(--spacing-sm)}.module-view .module-view-description h2{font-size:1.3rem}.module-view .module-description-content{font-size:.95rem}.module-view .module-view-lesson{grid-template-columns:1fr;grid-template-areas:"number" "content" "actions";text-align:center}.module-view .lesson-number{justify-self:center;margin-bottom:var(--spacing-xs)}.module-view .lesson-status{justify-content:center}.module-view .lesson-actions{margin-top:var(--spacing-sm);justify-content:center}}.module-view-footer{margin-top:var(--spacing-2xl);padding-top:var(--spacing-xl);text-align:center;color:var(--text-secondary)}.module-view-lesson-skeleton{display:flex;align-items:flex-start;gap:var(--spacing-lg);padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-md);margin-bottom:var(--spacing-md);box-shadow:0 0 0 1px var(--shadow-border)}.module-view-lesson-skeleton .lesson-number{display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:var(--bg-primary);border-radius:50%;font-weight:600;font-size:var(--font-size-lg);color:var(--text-primary);flex-shrink:0}.module-view-lesson-skeleton .lesson-content{flex:1;display:flex;flex-direction:column}.module-view-lesson-skeleton .skeleton-title{height:24px;width:70%;border-radius:var(--radius-xs)}.module-view-lesson-skeleton .skeleton-description{height:16px;width:100%;border-radius:var(--radius-xs)}.module-view-lesson-skeleton .skeleton-status{height:20px;width:120px;border-radius:var(--radius-xs);margin-top:var(--spacing-xs)}.module-view-lesson-skeleton .lesson-actions{flex-shrink:0}.module-view-lesson-skeleton .skeleton-button{height:40px;width:100px;border-radius:var(--radius-sm)}.skeleton{background:linear-gradient(90deg,var(--skeleton-base,#e0e0e0) 0,var(--skeleton-shine,#f0f0f0) 50%,var(--skeleton-base,#e0e0e0) 100%);background-size:200% 100%;animation:skeleton-shine 1.5s ease-in-out infinite}@keyframes skeleton-shine{0%{background-position:-200% 0}100%{background-position:200% 0}}[data-theme=dark] .skeleton{--skeleton-base:#2a2a2a;--skeleton-shine:#333333}#left-sidebar .nav-module{margin-bottom:var(--spacing-md)}#left-sidebar .nav-module .module-header{display:flex;align-items:center;cursor:pointer;margin-bottom:var(--spacing-md)}#left-sidebar .nav-module .module-info{flex-grow:1;min-width:0}#left-sidebar .nav-module .module-title{font-weight:400;font-size:var(--text-md);line-height:1.4;margin:0;overflow:hidden;white-space:nowrap;letter-spacing:var(--ls-lg)}#left-sidebar .nav-module .module-toggle{background:0 0;border:none;padding:0;cursor:pointer;line-height:1;display:flex;align-items:center;flex-shrink:0}#left-sidebar .nav-module .toggle-icon{width:1rem;height:1rem;transition:transform .2s ease;align-self:center}#left-sidebar .nav-module.expanded .toggle-icon{transform:rotate(90deg)}#left-sidebar .nav-module .module-lessons{display:none!important;padding-left:20px;overflow:hidden;transition:var(--lesson-transition);background:var(--lesson-bg);border-radius:var(--lesson-radius);margin-top:var(--spacing-xs)}#left-sidebar .nav-module.expanded .module-lessons{display:block!important}#left-sidebar .module-lessons.expanded{display:block!important}#left-sidebar .nav-lesson{padding:6px 10px;cursor:pointer;border-radius:8px;margin-bottom:var(--spacing-xs);background:0 0;border:1px solid transparent;transition:all .2s ease;position:relative}#left-sidebar .nav-lesson:hover{border:1px solid var(--border-color);opacity:1!important}#left-sidebar .nav-lesson.current{color:var(--text-primary);position:relative;box-shadow:0 0 1px 0 #0072ff;border:1px solid rgba(0,114,255,.5)}#left-sidebar .nav-lesson.completed{opacity:.75}#left-sidebar .lesson-title-row{display:flex;align-items:center;width:100%;min-width:0;margin:3px 0}#left-sidebar .lesson-title{font-size:var(--text-md);line-height:normal;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}#left-sidebar .lesson-progress-indicator{flex-shrink:0;width:1.2rem;height:1.2rem;display:flex;align-items:center;justify-content:center}#left-sidebar .circular-progress-sidebar{position:relative;width:1.2rem;height:1.2rem;display:flex;align-items:center;justify-content:center}#left-sidebar .progress-circle{width:1.2rem;height:1.2rem;transform:rotate(-90deg);position:absolute;top:0;left:0}#left-sidebar .progress-circle-bg{fill:none;stroke:var(--border-color);stroke-width:2;opacity:.6}#left-sidebar .progress-circle-fill{fill:none;stroke:var(--primary-color);stroke-width:2;stroke-linecap:round;transition:stroke-dashoffset .3s ease}#left-sidebar .circular-progress-sidebar[data-progress="0"] .progress-circle-fill{opacity:0}#left-sidebar .title-check-icon{width:1rem;height:1rem;color:var(--success-color);flex-shrink:0}.lessons-loading{padding:var(--spacing-md);text-align:center;color:var(--text-secondary);font-size:var(--font-size-sm)}.lessons-loading.active{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm)}.lessons-loading .loading-icon{width:16px;height:16px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.lessons-error{padding:var(--spacing-md);text-align:center;color:var(--color-danger);font-size:var(--font-size-sm)}.lessons-error p{margin:0 0 var(--spacing-sm) 0}.lessons-error .retry-btn{padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-danger);color:#fff;border:none;border-radius:var(--radius-sm);font-size:var(--font-size-xs);cursor:pointer;transition:opacity .2s ease}.lessons-error .retry-btn:hover{opacity:.8}.no-lessons{padding:var(--spacing-md);text-align:center;color:var(--text-secondary);font-size:var(--font-size-sm);font-style:italic}@media (max-width:420px){#left-sidebar .module-lessons{margin-left:calc(15px + var(--spacing-xs))}}.lesson-practice-container{width:100%;max-width:100%;position:relative;overflow:visible;min-height:400px}.practice-question{width:100%}.question-header-nav{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;flex-wrap:wrap;gap:1rem}.question-header-nav h3{margin:0}.question-nav-buttons{display:flex;align-items:center;gap:.75rem}.question-nav-buttons .bttn{display:flex;align-items:center;justify-content:center}.question-nav-buttons .bttn:disabled{opacity:.5;cursor:not-allowed}.question-type-badge{display:inline-flex;align-items:center;justify-content:center;padding:var(--badge-padding-y) var(--badge-padding-x);font-size:var(--text-sm);font-weight:600;letter-spacing:var(--ls-base);border-radius:5px;line-height:normal;margin-bottom:1.5rem}.question-type-badge.mcq{background:color-mix(in srgb,var(--brand-color) 15%,transparent);color:var(--brand-color);border:1px solid color-mix(in srgb,var(--brand-color) 25%,transparent)}.question-type-badge.frq{background:color-mix(in srgb,var(--active-green) 15%,transparent);color:var(--active-green);border:1px solid color-mix(in srgb,var(--active-green) 25%,transparent)}.question-type-badge.gq{background:color-mix(in srgb,#ff6b35 15%,transparent);color:#ff6b35;border:1px solid color-mix(in srgb,#ff6b35 25%,transparent)}.question-navigation{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem}.nav-btn{display:flex;align-items:center;gap:.5rem;min-width:100px}.nav-btn:disabled{opacity:.5;cursor:not-allowed}.question-progress{font-size:var(--text-sm);font-weight:500;color:var(--text-secondary-color);letter-spacing:var(--ls-sm)}.question-content{margin-bottom:2rem}[data-theme=dark] .question-images{background:#000;padding:1.5rem;border-radius:12px}[data-theme=dark] .question-content img{filter:invert(1) hue-rotate(180deg)}.question-text{font-size:var(--text-base);color:var(--text-primary-color);margin-bottom:1.5rem}.choice-images,.part-images,.question-images{display:flex;flex-direction:column;gap:1rem;margin:1.5rem 0}.choice-image,.part-image,.question-image{max-width:100%;height:auto;border-radius:12px;align-self:center}.mcq-choices{display:flex;flex-direction:column;gap:1.5rem;margin-top:1.5rem;margin-bottom:3rem}.mcq-choice{display:flex;align-items:flex-start;gap:1.5rem;padding:.55rem 2rem;border:.5px solid var(--input-border-color);box-shadow:-1px 1px 0 1px var(--shadow-border);border-radius:12px;cursor:pointer;transition:all .3s cubic-bezier(.4, 0, .2, 1);position:relative;overflow:hidden}.mcq-choice p{margin:0;line-height:1.6rem}.mcq-choice:hover{border-color:var(--brand-light)!important;transform:translateY(2px);box-shadow:0 4px 12px color-mix(in srgb,var(--brand-color) 15%,transparent)}.mcq-choice:has(.mcq-input:checked){border-color:var(--brand-color);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand-color) 20%,transparent),0 4px 12px color-mix(in srgb,var(--brand-color) 15%,transparent);transform:translateY(1px)}.mcq-choice:has(.mcq-input:checked)::before{opacity:1}.mcq-input{flex-shrink:0;margin:0;accent-color:var(--brand-color);width:1rem;height:1rem;cursor:pointer;align-self:center}.choice-text{flex:1;font-size:var(--text-base)}.frq-parts{display:flex;flex-direction:column;gap:2rem;margin:1.5rem 0}.frq-meta{display:flex;align-items:center;gap:1rem}.frq-label{font-size:var(--text-base);font-weight:600;color:var(--text-primary-color);letter-spacing:var(--ls-md)}.frq-points{font-size:var(--text-sm);color:var(--text-tertiary-color);background:var(--card-bg-color);padding:.25rem .5rem;border-radius:6px;border:1px solid var(--input-border-color)}.part-question{font-size:var(--text-base);line-height:1.6;color:var(--text-primary-color);margin-bottom:1rem}.frq-answer,.gq-answer-input{display:flex;width:100%;min-height:50px;max-height:170px;overflow-y:auto;padding:.75rem;border:1px solid transparent;border-radius:10px;font-family:inherit;font-size:var(--text-base);line-height:2;color:var(--text-primary-color);background:var(--input-bg);resize:vertical;transition:all .3s ease;border:.5px solid var(--border-color)}.gq-answer-input{box-shadow:-1px 1px 0 1px var(--shadow-border)}.frq-answer:focus,.gq-answer-input:focus{outline:0;border-color:var(--brand-light);box-shadow:0 0 0 2px color-mix(in srgb,var(--brand-color) 20%,transparent)}.frq-answer::placeholder,.gq-answer-input::placeholder{color:var(--text-tertiary-color)}.gq-answer{margin:1.5rem 0}.practice-question .incorrect{border-color:#ee1c1c!important;background:color-mix(in srgb,#ee1c1c 6%,var(--bg-color))!important;box-shadow:0 0 12px 0 color-mix(in srgb,#ee1c1c 20%,transparent)!important}.practice-question .correct{border-color:var(--active-green)!important;background:color-mix(in srgb,var(--active-green) 6%,var(--bg-color))!important;box-shadow:0 0 12px 0 color-mix(in srgb,var(--active-green) 20%,transparent)!important}.practice-question .partial{border-color:#f3a31a!important;background:color-mix(in srgb,#f3a31a 6%,var(--bg-color))!important;box-shadow:0 0 12px 0 color-mix(in srgb,#f3a31a 20%,transparent)!important}.question-actions{display:flex;align-items:center;justify-content:flex-start;flex-wrap:wrap;gap:1rem}.lesson-practice-container .bttn{min-height:2.5rem;min-width:2.5rem;padding:0 1.25rem}.bttn .animate-spin{animation:spin 1s linear infinite}.question-feedback{margin:1.5rem 0;padding:1.5rem;border-radius:12px;border:1px solid var(--input-border-color);background:var(--bg-color);font-size:var(--text-base)}.feedback-status{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.feedback-status svg{width:20px;height:20px;flex-shrink:0}.status-text{font-size:var(--text-base);font-weight:500;letter-spacing:var(--ls-md)}.score-text{font-size:var(--text-sm);color:var(--text-secondary-color);margin-left:auto}.feedback-content{padding-top:1rem;border-top:1px solid var(--input-border-color);margin-top:1rem}.question-explanation{margin-top:2rem}.explanation-content{display:flex;flex-direction:column;gap:1.5rem}.answer-text{border:2px dashed var(--shadow-border);border-radius:12px;padding-left:2rem}.collapsible-section{box-shadow:0 0 1px 1px var(--shadow-border);border:.5px solid transparent;border-radius:12px;transition:all .3s cubic-bezier(.4, 0, .2, 1)}.collapsible-section.is-expanded{box-shadow:-.5px .5px 0 .5px var(--shadow-border);border:.5px solid var(--border-color)}.collapsible-section--answer.is-expanded,.collapsible-section--explanation.is-expanded{box-shadow:0 0 1px 1px transparent;border:.5px solid transparent;border-radius:12px!important;overflow:visible!important}.collapsible-header{display:flex;align-items:center;padding:1.25rem;justify-content:space-between;flex-wrap:wrap;gap:.5rem;cursor:pointer;transition:all .3s cubic-bezier(.4, 0, .2, 1);user-select:none}.collapse-icon{width:20px;height:20px;color:var(--text-muted-color);transition:transform .3s cubic-bezier(.4, 0, .2, 1),color .2s ease}.collapsible-section:not(.is-expanded) .collapse-icon[data-lucide=chevron-up]{transform:rotate(180deg)}.collapsible-header:hover .collapse-icon{color:var(--text-primary-color)}.collapsible-content{overflow:hidden;transition:max-height .4s cubic-bezier(.4, 0, .2, 1),opacity .3s cubic-bezier(.4, 0, .2, 1),padding .3s cubic-bezier(.4, 0, .2, 1)}.collapsible-content.is-expanded{max-height:fit-content;opacity:1;overflow:visible!important;padding:1.25rem}.collapsible-content.is-collapsed{max-height:0;opacity:0;padding:0;border:none!important}.collapsible-section--answer .collapsible-content.is-expanded,.collapsible-section--explanation .collapsible-content.is-expanded{margin:0;overflow:visible!important;max-width:none!important}.lesson-practice-error{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:3rem 2rem;background:var(--card-bg-color);border-radius:12px;border:1px solid var(--input-border-color);margin:2rem 0}.lesson-practice-error .error-icon{width:48px;height:48px;color:var(--text-tertiary-color);margin-bottom:1rem}.lesson-practice-error h3{font-size:var(--text-lg);font-weight:500;color:var(--text-primary-color);margin-bottom:.5rem;letter-spacing:var(--ls-md)}.lesson-practice-error p{font-size:var(--text-base);color:var(--text-secondary-color);margin-bottom:1.5rem;max-width:400px}.question-explanation{scrollbar-width:thin;scrollbar-color:var(--text-tertiary-color) var(--card-bg-color)}.question-explanation::-webkit-scrollbar{height:8px}.question-explanation::-webkit-scrollbar-track{background:var(--card-bg-color);border-radius:4px}.question-explanation::-webkit-scrollbar-thumb{background:var(--text-tertiary-color);border-radius:4px}.question-explanation::-webkit-scrollbar-thumb:hover{background:var(--text-secondary-color)}.practice-loading-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;min-height:400px;z-index:10}.practice-loading-state[style*="display: none"]{display:none!important;visibility:hidden!important;z-index:-1!important}.practice-loading-state .loading-spinner{width:24px;height:24px;border:2px solid var(--input-border-color);border-top:2px solid var(--text-primary-color,#fff);border-radius:50%;animation:spin 1s linear infinite;flex-shrink:0;margin:0 auto}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.practice-loading-state p{margin:.5rem 0;color:var(--text-tertiary-color);font-size:var(--text-base)!important;font-weight:400;letter-spacing:var(--ls-sm)}.practice-error-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--card-bg-color);text-align:center;min-height:400px;z-index:10}.practice-error-state[style*="display: none"]{display:none!important;visibility:hidden!important;z-index:-1!important}.practice-error-state .error-icon{font-size:3rem;margin-bottom:1rem;opacity:.7}.practice-error-state p{margin:0 0 1.5rem 0;color:var(--text-secondary-color);font-size:var(--text-base)}.practice-error-state .retry-practice-btn{margin:0}.practice-content-container{position:relative;width:100%;height:100%;min-height:400px;z-index:1}.practice-content-container[style*="display: block"]{display:block!important;visibility:visible!important}.explanation-content,.question-explanation{overflow:visible!important}.table-breakout-wrapper{position:relative;margin:0 0 1rem 0;max-width:100%;overflow-x:auto;overflow-y:visible}.table-breakout-wrapper.scrollable{padding:15px 10px 30px 10px}.table-breakout-wrapper table{margin:0 auto;width:100%;max-width:100%}@media (min-width:1100px){.table-breakout-wrapper{margin:0 calc(-1 * min(6rem,12vw)) 1.5rem;max-width:min(1200px,90vw);overflow-x:visible}}@media (max-width:1099px){.table-breakout-wrapper table{min-width:950px}}.table-scroll-indicator{position:absolute;top:0;left:1.5rem;font-size:var(--text-sm);color:var(--text-muted-color);background:0 0;padding:0;line-height:1;opacity:0;transition:opacity .3s ease;pointer-events:none;z-index:10}.table-breakout-wrapper.scrollable:hover .table-scroll-indicator{opacity:.9}.feedback-actions{margin-top:1rem;display:flex;gap:.75rem;align-items:center}.retry-question-btn{background:var(--card-bg-color);border:1px solid var(--input-border-color);color:var(--text-primary-color);transition:all .2s ease}.retry-question-btn:hover{background:var(--card-hover-bg-color);border-color:var(--text-secondary-color);transform:translateY(-1px)}@media (max-width:768px){.feedback-actions{flex-direction:column;align-items:stretch}.retry-question-btn{width:100%;justify-content:center}.question-actions{flex-direction:column;gap:1rem}.question-actions .bttn{width:100%;justify-content:center}.question-header-nav{flex-direction:column;align-items:flex-start;gap:.75rem}.question-nav-buttons{align-self:stretch;justify-content:space-between}}.part-scores{margin-top:1rem;padding-top:1rem;border-top:1px solid var(--input-border-color)}.part-score-item{display:flex;align-items:flex-start;gap:.75rem;margin-bottom:.75rem;font-size:var(--text-sm)}.part-score-item:last-child{margin-bottom:0}.part-score-item .part-label{font-weight:600;color:var(--text-secondary-color);min-width:60px}.part-score-item .part-score{font-weight:500;padding:.125rem .5rem;border-radius:4px;font-size:var(--text-xs)}.part-score-item .part-score.correct{background:color-mix(in srgb,var(--active-green) 15%,transparent);color:var(--active-green)}.part-score-item .part-score.incorrect{background:color-mix(in srgb,#dc2626 15%,transparent);color:#dc2626}.part-score-item .part-score.partial{background:color-mix(in srgb,#f59e0b 15%,transparent);color:#f59e0b}.part-score-item .part-feedback{flex:1;color:var(--text-secondary-color);line-height:1.5}.sidebar-header{margin:var(--spacing-md) 0}.sidebar-header h3{font-size:var(--text-base);font-weight:500;color:var(--text-primary)}#left-sidebar{grid-area:left-sidebar;border-right:1px solid var(--border-color);transition:all .3s ease;position:relative;margin:0;width:var(--sidebar-width);min-width:var(--sidebar-width);padding:var(--spacing-md);background:var(--sidebar-bg);overflow-y:auto;overflow-x:hidden;z-index:10;box-sizing:border-box}#left-sidebar:not(.collapsed){border-right:1px solid var(--border-color)}#right-sidebar{grid-area:right-sidebar;background-color:var(--sidebar-bg);border-left:1px solid var(--border-color);overflow-y:auto;overflow-x:visible;padding:var(--spacing-md);transition:width .3s ease;position:relative;margin:0;width:var(--sidebar-width);min-width:var(--sidebar-width);z-index:10;box-sizing:border-box}#right-sidebar:not(.collapsed){border-left:1px solid var(--border-color)}.sidebar-resize-handle{position:absolute;top:0;left:0;width:5px;height:100%;cursor:col-resize;background:0 0;z-index:100}#right-sidebar .sidebar-resize-handle::after{content:'⋮';position:absolute;left:-2px;top:50%;transform:translateY(-50%);color:var(--text-primary);font-size:var(--text-lg);line-height:normal;writing-mode:vertical-lr;text-orientation:upright;letter-spacing:-4px;padding:10px 0;background:var(--sidebar-bg);border:1px solid var(--border-color);border-radius:4px}#right-sidebar .sidebar-resize-handle:hover::after{color:#64748b}#right-sidebar .sidebar-resize-handle{left:0}#bottom-control-bar{grid-area:controls;background-color:var(--control-bar-bg);border-top:1px solid var(--border-color);height:var(--control-bar-height,60px);position:sticky;bottom:0;z-index:110;box-shadow:0 0 -2px 10px rgba(0,0,0,.05);overflow-x:hidden}.control-bar-container{max-width:100%;margin:0 auto;height:100%;display:flex;justify-content:space-between;align-items:center;padding:0 var(--spacing-md)}.lesson-controls{display:flex;align-items:center;gap:var(--spacing-sm)}.lesson-completion-status{font-size:var(--text-md);font-weight:500;line-height:normal;border-radius:var(--bttn-radius);display:inline-flex;align-items:center;gap:.5rem;transition:all .3s ease;cursor:default}.lesson-completion-status.in-progress{color:var(--text-secondary-color)}.lesson-completion-status.completed{color:var(--active-green);border:1px solid rgba(0,210,0,.2);background-color:rgba(0,210,0,.05);padding:.5rem 1rem}