:root{--cardRadius:12px;--buttonRadius:8px;--learningCardXPadd:20px;--learningCardBPadd:24px;--elevationShadow2:0 2px 8px #00000021,0 0 1px #00000030;--learningContentMaxWidth:1000px}.practice-main-section::-webkit-scrollbar{display:none}.practice-main-section h2{scroll-margin-top:76px}.practice-main-content{width:100%;max-width:var(--learningContentMaxWidth);margin:0 auto}.learning-inner-wrapper{padding:4px 0 24px;flex:1 1}.practice-main-inner{position:relative;width:100%;height:100%;padding:80px 20px 0}@media (min-width:480px){.practice-main-inner{padding:80px 30px 0}}@media (min-width:576px){.practice-main-inner{padding:80px 40px 0}}@media (min-width:768px){.practice-main-inner{padding:80px 40px 0}}@media (min-width:992px){.practice-main-inner{padding:80px 50px 0}}@media (min-width:1200px){.practice-main-inner{padding:80px 40px 0}.practice-main-content{width:95%}}.practice-title{font-size:24px;font-weight:700;color:var(--text-dark);padding-bottom:32px;margin:0}@supports (-webkit-hyphens:none){.practice-title{font-weight:620}}@media (min-width:992px){.practice-title{font-size:30px}}.practice-card{border-radius:var(--cardRadius);box-shadow:var(--elevationShadow2)}.practice-card-head{padding:12px var(--learningCardXPadd)}.practice-card-title svg{font-size:20px}.practice-card-body{padding:16px var(--learningCardXPadd) var(--learningCardBPadd)}.practice-card-body hr{border-color:var(--txt-disabled)!important}.apti-text-content{color:var(--txt-intense)}.apti-text-content table{border-color:var(--txt-disabled)}.apti-text-content .lrn-summary li::marker,.apti-text-content .lrn-tricks li::marker{color:var(--txt-primary)}.practice-card-mock-grid{display:grid;grid-gap:20px 24px;gap:20px 24px}@media (min-width:768px){.practice-card-mock-grid.is-grid{grid-template-columns:auto 220px;align-items:center}}.premium-badge{padding:3px 10px;font-size:12px;font-weight:500;color:var(--txt-btn);background:linear-gradient(90deg,#6d4cff,#1e90ff);background-repeat:no-repeat;background-size:100% 100%;border-radius:12px;margin-left:16px}[data-theme=dark] .premium-badge{background:linear-gradient(90deg,#5740bf,#337fcc)}.test-history-title{padding-bottom:4px;color:var(--txt-intense)}.test-history-title .txt-theme-secondary{color:var(--txt-secondary)}.skeleton-item{background:linear-gradient(90deg,var(--border-color) 25%,var(--secondary-hover-bg) 50%,var(--border-color) 75%);border-radius:var(--buttonRadius)}.module-error p{margin-top:16px}.practice-question-toggle-btn{border-radius:var(--buttonRadius)}.practice-question-toggle-btn:hover{background:var(--secondary-hover-bg)}.practice-bottom-navigation-outer{position:-webkit-sticky;position:sticky;bottom:8px;z-index:99;padding:0 var(--dboardMainContentXAxisPadd);width:100%;max-width:var(--learningContentMaxWidth);margin:0 auto}@media 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1;display:flex;align-items:center;justify-content:center;height:var(--bottomNavHeight);padding:6px;color:var(--txt-intense);font-size:15px;background-color:var(--card-bg);border-left:1px solid var(--border-color);cursor:pointer}.practice-bottom-section-bar:first-child{border-left:none}.practice-bottom-section-bar:hover{background-color:var(--secondary-hover-bg)}.practice-bottom-section-bar svg{font-size:20px;color:var(--txt-brand)}@media (min-width:360px){:root{--dboardMainContentXAxisPadd:20px}}@media (min-width:481px){:root{--learningCardXPadd:20px;--learningCardBPadd:24px}}@media (min-width:576px){:root{--dboardMainContentXAxisPadd:35px}}@media (min-width:1200px){:root{--learningCardXPadd:24px}}@media (min-width:1400px){:root{--learningContentMaxWidth:1300px;--dboardMainContentXAxisPadd:40px}.practice-main-content{width:100%;display:flex;flex:1 1}}.txt-theme-primary{color:var(--txt-primary)}.txt-theme-secondary{color:var(--txt-secondary)}.txt-theme-brand{color:var(--txt-brand)}.common-font{font-weight:600}.gap-2{gap:8px}.stats-toggler{transition:background .2s}.stats-toggler.points svg{color:var(--solid-yellow-color)}.stats-toggler.streak svg{color:var(--solid-orange-color)}@supports (-webkit-hyphens:none){.stats-toggler{font-weight:520}}@media (min-width:360px){.stats-toggler{padding:8px 12px}.stats-toggler svg{font-size:18px}}.practice-side-menu-container{position:fixed;top:0;left:0;width:var(--dboardSideNavWidth,260px);height:100dvh;background:var(--card-bg,#fff);border-right:1px solid var(--border-color,#e5e7eb);z-index:998;transform:translateX(-100%);transition:transform .3s ease}.practice-side-menu-container.mobile-open{transform:translateX(0)}@media (min-width:992px){.practice-side-menu-container.landscape-open{transform:translateX(0)}}.side-menu-overlay{position:fixed;inset:0;background:#00000030;z-index:997;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .3s ease,visibility .3s ease}.side-menu-overlay.show{opacity:1;visibility:visible;pointer-events:auto}@media (min-width:992px){.side-menu-overlay{display:none!important}}.practice-side-action-wrapper{width:100%;max-width:260px;height:100%;display:flex;flex-direction:column;overflow:hidden;background:var(--card-bg,#fff)}.side-nav-header{display:flex;align-items:center;justify-content:space-between;height:60px;padding:0 16px;border-bottom:1px solid var(--border-color,#e5e7eb);flex-shrink:0;background:var(--card-bg,#fff)}.side-nav-header .header-logo{display:inline-flex;align-items:center;text-decoration:none}.side-nav-header .nav-toggler{display:flex;align-items:center;justify-content:center;width:36px;height:36px;font-size:18px;color:var(--txt-intense,#1f2937);background:transparent;border:1px solid var(--border-color,#e5e7eb);border-radius:8px;cursor:pointer;transition:all .2s;padding:0}.side-nav-header .nav-toggler:hover{background:var(--pill-hover-bg,#f9fafb)}.side-nav-header .nav-toggler svg{display:block}.side-menu-wrapper-inner{flex:1 1;overflow-y:auto;overflow-x:hidden;padding-bottom:48px}.side-menu-wrapper-inner::-webkit-scrollbar{width:6px;display:none}.side-menu-wrapper-inner::-webkit-scrollbar-track{background:transparent}.side-menu-wrapper-inner::-webkit-scrollbar-thumb{background:var(--brand-primary-medium);border-radius:3px}.side-menu-wrapper-inner::-webkit-scrollbar-thumb:hover{background:var(--brand-primary-medium)}.syllabus-wrapper{padding:0}.syllabus-group-head{padding:12px 16px;font-size:14px;font-weight:600;color:var(--txt-intense,#1f2937);transition:background .2s;-webkit-user-select:none;-moz-user-select:none;user-select:none}.syllabus-group-head svg{font-size:16px;transition:transform .2s;color:var(--text-secondary,#6b7280)}.syllabus-group-body{padding:0}.syllabus-item{gap:8px;padding:12px 16px;font-size:14px;color:var(--txt-primary);text-decoration:none;transition:all .2s;border-left:3px solid transparent}.syllabus-item.active{background:rgba(59,130,246,.1);color:var(--lang-color,#3b82f6);border-left-color:var(--lang-color,#3b82f6);font-weight:600}.syllabus-icon-wrapper{display:inline-flex;width:18px;height:18px;font-size:16px;flex-shrink:0;color:currentColor}.syllabus-text{flex:1 1;line-height:1.4;word-wrap:break-word}.syllabus-course-title{flex:1 1}.syllabus-cta-container{padding:16px}.user-cta-btn{gap:8px;height:40px;padding:0 16px;font-size:14px;font-weight:600;color:#fff;border-radius:8px;transition:all .2s}.user-cta-btn svg{font-size:16px}@media (min-width:992px){body:has(.practice-side-menu-container.landscape-open) .practice-main-section{margin-left:var(--dboardSideNavWidth,260px);transition:margin-left .3s ease}body:has(.practice-side-menu-container.landscape-open) .practice-main-header{left:var(--dboardSideNavWidth,260px);width:calc(100% - var(--dboardSideNavWidth, 260px))}}@media (min-width:768px){.syllabus-group-head{padding:12px 20px;font-size:14px}.syllabus-item{font-size:14px}}.syllabus-course-header{flex-shrink:0;border-bottom:1px solid var(--border-color,#e5e7eb);background:var(--card-bg,#fff)}.syllabus-course-header .syllabus-item{padding:12px 16px;border-left:none}.syllabus-course-header .syllabus-item:hover{background:var(--pill-hover-bg,#f9fafb)}.breadcrumb-nav{width:100%}a.breadcrumb-link{color:"red"}.breadcrumb-nav .breadcrumbs-container{position:relative;display:flex;flex-wrap:wrap;align-items:center;row-gap:8px;margin-bottom:16px;font-size:15px}@media (min-width:992px){.breadcrumb-nav .breadcrumbs-container{margin-bottom:unset}}.breadcrumb-nav 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.breadcrumb-nav .breadcrumb-ellipsis{color:var(--txtGreyColor,#999)}[data-theme=dark] .breadcrumb-nav .breadcrumb-ellipsis:hover{color:#8781f7}.breadcrumb-nav .breadcrumb-text-wrapper{position:relative;display:inline-flex;align-items:center}.breadcrumb-nav .breadcrumb-text{display:inline-block;max-width:180px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;cursor:pointer;color:#4d4d4d;transition:color .2s;text-decoration:none!important}.breadcrumb-nav .breadcrumb-text.breadcrumb-highlight{color:#5f56fe;font-weight:500}.breadcrumb-nav .breadcrumb-text:hover{color:var(--txtBrandColor,#5f56fe);text-decoration:none!important}.breadcrumb-nav .breadcrumb-text.non-clickable{cursor:default}.breadcrumb-nav .breadcrumb-text.non-clickable:hover{color:var(--txt-secondary,#6c757d)}[data-theme=dark] .breadcrumb-nav .breadcrumb-text{color:var(--txtGreyColor,#999)}[data-theme=dark] .breadcrumb-nav .breadcrumb-text:hover{color:#8781f7}[data-theme=dark] .breadcrumb-nav .breadcrumb-text.non-clickable:hover{color:var(--txtGreyColor,#999)}.breadcrumb-nav .breadcrumb-tooltip{position:absolute;top:24px;left:10px;background:var(--card-bg,#fff);padding:5px 10px;font-size:13px;white-space:nowrap;border-radius:6px;box-shadow:var(--elevationShadow2,0 2px 8px #00000021);opacity:1;transform:translateY(0);transition:opacity .15s ease,transform .15s ease;pointer-events:none;z-index:999;color:var(--txt-intense,#111);border:1px solid var(--borderColor,#e5e7eb)}[data-theme=dark] .breadcrumb-nav .breadcrumb-tooltip{background:#212020;box-shadow:0 1px 3px #04040466;color:#e3e3e3;border-color:#383838}.breadcrumb-nav .breadcrumb-dropdown{position:absolute;top:32px;left:0;width:max-content;min-width:200px;max-width:240px;padding:8px 0;background:var(--card-bg,#fff);border:1px solid var(--borderColor,#e5e7eb);border-radius:var(--buttonRadius,8px);box-shadow:var(--elevationShadow2,0 2px 8px #00000021);z-index:50}[data-theme=dark] .breadcrumb-nav .breadcrumb-dropdown{background:#212020;border-color:#383838;box-shadow:0 1px 3px #04040466}.breadcrumb-nav .breadcrumb-drop-item{padding:8px 16px;font-size:15px;cursor:pointer;color:var(--txt-primary);transition:background .2s}.breadcrumb-nav .breadcrumb-drop-item:hover{background:var(--secondary-hover-bg,#f8f9fa)}[data-theme=dark] .breadcrumb-nav .breadcrumb-drop-item{color:#ccc}[data-theme=dark] .breadcrumb-nav .breadcrumb-drop-item:hover{background:#2c2c2c}.desktop-breadcrumbs,.mobile-breadcrumbs{display:none}@media (min-width:992px){.desktop-breadcrumbs{display:block}.mobile-breadcrumbs{display:none}}@media (max-width:1199px){.desktop-breadcrumbs{display:none}.mobile-breadcrumbs{display:block;margin-bottom:24px}}:root{--header-height:60px;--bg-color:#fff;--text-primary:#1f2937;--text-secondary:#6b7280;--border-color:#e5e7eb;--star-color:#fbbf24;--fire-color:#ff9b41;--lang-color:#3b82f6;--pill-bg:#fff}.codefly-header{position:fixed;top:0;width:100%;height:var(--header-height);padding:0 16px;display:flex;justify-content:space-between;align-items:center;z-index:100;background:#fff;border-bottom:1px solid var(--border-color)}@media (min-width:992px){.header-bird.desktop-only{display:none!important}.codefly-header.landscape-open{width:calc(100% - var(--sidebar-width))}}.header-bird.mobile-bird,.header-logo.mobile-bird{display:flex;align-items:center}@media (min-width:992px){.header-left-cta .header-logo,.header-logo.mobile-bird{display:none!important}}.practice-main-header{position:fixed;padding:0 16px;top:0;left:0;height:var(--header-height);background:var(--bg-color);border-bottom:1px solid var(--border-color);z-index:100}.header-inner,.practice-main-header{width:100%;display:flex;align-items:center}.header-inner{justify-content:space-between}.header-left-cta{gap:16px}.header-left-cta,.square-btn{display:flex;align-items:center}.square-btn{background:transparent;border:1px solid var(--border-color);border-radius:8px;color:#4d4d4d;font-size:20px;cursor:pointer;justify-content:center;width:40px;height:40px;transition:all .2s}.square-btn:hover{background-color:#f9fafb;color:var(--text-primary)}.header-logo{display:none}.header-logo-img{width:32px;height:32px;object-fit:contain}@media (max-width:991px){.header-logo,.mobile-nav-toggler{display:flex}.desktop-nav-toggler{display:none}}.mobile-nav-toggler{display:none}.desktop-nav-toggler{display:flex}.home-icon{font-size:18px;color:var(--text-secondary)}.separator{font-size:10px;color:#9ca3af}.header-right-cta,.separator{display:flex;align-items:center}.header-right-cta{gap:15px;margin-left:auto}@media (min-width:360px){.header-right-cta{gap:12px}}.header-pill{display:flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--border-color);border-radius:9999px;background-color:var(--pill-bg);height:40px;white-space:nowrap}.pill-text{font-weight:500;font-size:16px;color:var(--text-primary)}.icon-star{color:var(--star-color);font-size:16px}.icon-fire{color:var(--fire-color);font-size:16px}.icon-lang{color:var(--lang-color);font-size:18px}.language-pill-btn{cursor:pointer;transition:background .2s}.language-pill-btn:hover{background-color:#f9fafb}.theme-toggle-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--border-color);border-radius:50%;background-color:var(--pill-bg);color:var(--text-secondary);cursor:pointer;font-size:20px;transition:all .2s}.theme-toggle-btn:hover{background-color:#f9fafb;color:var(--text-primary);cursor:not-allowed}@media (max-width:991px){.mobile-nav-toggler{display:flex}.desktop-nav-toggler{display:none}}.language-dropdown-container{position:relative}@media (max-width:576px){.language-dropdown-container{display:none}}.language-toggle-btn{display:flex;align-items:center;gap:6px;padding:8px 12px;font-size:14px;font-weight:500;color:var(--txt-primary);background:transparent;border:1px solid var(--border-color);border-radius:var(--button-radius);cursor:pointer;transition:background var(--hover-transition-duration)}.language-toggle-btn:hover{background:var(--hover-bg)}.language-toggle-btn svg{font-size:18px}.language-short{text-transform:uppercase}.language-label{display:none;text-transform:capitalize}@media (min-width:576px){.language-short{display:none}.language-label{display:inline}}.language-panel{position:absolute;top:calc(100% + 8px);right:0;min-width:140px;background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--card-radius);box-shadow:0 4px 12px rgba(0,0,0,.15);z-index:1000;overflow:hidden}.language-option{display:block;width:100%;padding:12px 16px;font-size:14px;text-align:left;color:var(--txt-primary);background:transparent;border:none;cursor:pointer;transition:background var(--hover-transition-duration)}.language-option:hover{background:var(--hover-bg)}.language-option.active{background:var(--active-bg);color:var(--txt-brand);font-weight:500}.practice-card{background:var(--card-bg,#fff);border-radius:var(--cardRadius,10px);box-shadow:var(--elevationShadow2,0 2px 8px #00000021)}[data-theme=dark] .practice-card{background:#212020;box-shadow:0 1px 3px #04040466}.practice-card-head{padding:12px var(--learningCardXPadd,16px);border-bottom:1px solid var(--borderColor,#e5e7eb)}[data-theme=dark] .practice-card-head{border-bottom-color:#383838}.practice-card-title{gap:8px;color:var(--txtHeadingColor,#111);padding-bottom:0}[data-theme=dark] .practice-card-title{color:#efefef}.practice-card-title svg{color:var(--txtBrandColor,#635bff)}[data-theme=dark] .practice-card-title svg{color:#8781f7}.practice-card-body{padding:16px var(--learningCardXPadd,16px) var(--learningCardBPadd,20px);color:var(--txtHeadingColor,#111);background:var(--card-bg,#fff)}[data-theme=dark] .practice-card-body{color:#e3e3e3;background:#212020}.practice-card-body hr{border-color:var(--txtGreyColor,#999)!important}.practice-card-body mark{color:inherit;padding:0;background:none}.practice-content{color:var(--txtHeadingColor,#111)}[data-theme=dark] .practice-content{color:#e3e3e3}.question-pills-container{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;font-size:13px;padding-top:16px}.question-pills-container:empty{display:none}.level-badge{display:inline-block;font-size:13px;font-weight:500;padding:2px 10px;text-transform:capitalize;color:#fff;background:#5695fe;border-radius:25px}[data-theme=dark] .level-badge{color:#111}@supports (-webkit-hyphens:none){.level-badge{font-weight:520}}.practice-options{margin-bottom:16px}.practice-option-label{padding:12px 16px;background:#fff;border:2px solid var(--borderColor,#e5e7eb);border-radius:8px;transition:all .2s;position:relative}[data-theme=dark] .practice-option-label{color:#ccc;background:#212020;border-color:#383838}.practice-option-label:not(.correct):not(.incorrect):hover{background:#f8f9fa;border-color:var(--txtBrandColor,#635bff)}[data-theme=dark] .practice-option-label:not(.correct):not(.incorrect):hover{background:#2c2c2c;border-color:#8781f7}.practice-option-label.selected{background:rgba(99,91,255,.05);border-color:var(--txtBrandColor,#635bff)}[data-theme=dark] .practice-option-label.selected{background:rgba(135,129,247,.1);border-color:#8781f7}.practice-option-label.correct{background:#4caf50!important;border-color:#4caf50!important;color:#fff!important;font-weight:500;cursor:default}[data-theme=dark] .practice-option-label.correct{background:#3a7842!important;border-color:#3a7842!important;color:#fff!important}.practice-option-label.incorrect{background:#f44336!important;border-color:#f44336!important;color:#fff!important;font-weight:500;cursor:default}[data-theme=dark] .practice-option-label.incorrect{background:#ac4139!important;border-color:#ac4139!important;color:#fff!important}.practice-navigation{gap:16px}@media (min-width:576px){.practice-question-toggles-wrapper{display:flex;gap:8px}}.practice-question-toggle-btn{font-size:14px;font-weight:500;color:#4d4d4d;background:#fff;border:1px solid var(--borderColor,#e5e7eb);border-radius:var(--buttonRadius,8px);transition:all .2s}[data-theme=dark] .practice-question-toggle-btn{color:#ccc;background:#212020;border-color:#383838}.practice-question-toggle-btn:hover{background:#f8f9fa}[data-theme=dark] .practice-question-toggle-btn:hover{background:#2c2c2c}.practice-question-toggle-btn.active{border-bottom:3px solid var(--bgBtnColor,#635bff);transition:border-bottom .15s ease-in-out}[data-theme=dark] .practice-question-toggle-btn.active{border-bottom-color:#6366f1}[data-theme=dark] .practice-question-toggle-btn.solved{background:var(--pastelGreenDarkBg,#1e3a23);border-color:#3a7842}.pb-3{padding-bottom:12px}.text-pre-wrap{white-space:pre-wrap}.me-3{margin-right:12px}@media (min-width:768px){.me-md-3{margin-right:12px}}.txt-theme-brand{color:var(--txtBrandColor,#635bff)}[data-theme=dark] .txt-theme-brand{color:#8781f7}.txt-dark-grey-color{color:var(--txtGreyColor,#999)}.dbd-txt-theme-intense{color:var(--txtHeadingColor,#111)}[data-theme=dark] .dbd-txt-theme-intense{color:#e3e3e3}@media (min-width:481px){.practice-card-body{padding:20px var(--learningCardXPadd,20px) var(--learningCardBPadd,24px)}}@media (min-width:992px){.practice-card-title{font-size:18px}}@media (min-width:1200px){.practice-card-body{padding:20px var(--learningCardXPadd,24px) var(--learningCardBPadd,24px)}}.practice-content{overflow-x:auto}.practice-content p{margin-top:unset!important}.practice-content table{margin:16px 0;width:-moz-fit-content;width:fit-content;min-width:300px;border-collapse:collapse;line-height:1.5;border:1px solid grey}.practice-content th{font-weight:600;white-space:pre-wrap}.practice-content td,.practice-content th{padding:5px 15px;text-align:center;color:#000;border:1px solid grey}.practice-content td{vertical-align:middle}.practice-content td:first-child{white-space:pre-wrap}.practice-content caption{caption-side:top;color:#000;font-weight:600;text-align:center;margin-bottom:6px}@media (max-width:768px){.practice-content table{min-width:100%;font-size:14px}.practice-content td,.practice-content th{padding:8px 12px}}.practice-options{margin-top:12px}.practice-option-label{align-items:flex-start;gap:8px;padding:12px 14px;border-radius:10px;border:1px solid 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10px);left:50%;transform:translateX(-50%)}.tooltip-top .tooltip-bubble:after{content:"";position:absolute;top:100%;left:50%;transform:translateX(-50%);border-left:6px solid transparent;border-right:6px solid transparent;border-top:6px solid #111827}.tooltip-bottom .tooltip-bubble{top:calc(100% + 10px);left:50%;transform:translateX(-50%)}.tooltip-bottom .tooltip-bubble:after{content:"";position:absolute;bottom:100%;left:50%;transform:translateX(-50%);border-left:6px solid transparent;border-right:6px solid transparent;border-bottom:6px solid #111827}.tooltip-left .tooltip-bubble{right:calc(100% + 10px);top:50%;transform:translateY(-50%)}.tooltip-left .tooltip-bubble:after{content:"";position:absolute;left:100%;top:50%;transform:translateY(-50%);border-top:6px solid transparent;border-bottom:6px solid transparent;border-left:6px solid #111827}.tooltip-right .tooltip-bubble{left:calc(100% + 10px);top:50%;transform:translateY(-50%)}.tooltip-right 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svg{display:block;width:18px;height:18px;color:var(--txt-primary)}.syllabus-text{color:#4d4d4d;font-size:14px;margin-left:8px}.syllabus-item.active .syllabus-text{color:var(--txt-intense);font-weight:500}.syllabus-course-title{color:var(--bs-gray-dark);font-size:16px;margin-left:8px}.syllabus-cta-container{padding:12px var(--dboard-side-nav-x-padd)}.practice-main-section{position:relative;width:100%;min-height:100dvh;display:flex;flex-direction:column;justify-content:space-between;overflow-x:hidden}@media (min-width:992px){.practice-main-header.sidebar-open{left:var(--learning-side-nav-width)}}.nav-toggler{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--button-radius);background:transparent;cursor:pointer;transition:background var(--hover-transition-duration)}.nav-toggler:hover{background:var(--hover-bg)}.nav-toggler svg{width:18px;height:18px;color:var(--txt-primary)}.mobile-nav-toggler{display:flex}@media 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svg{font-size:18px}.theme-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:1px solid var(--border-color);border-radius:50%;background:transparent;cursor:pointer;transition:background var(--hover-transition-duration)}.theme-toggle:hover{background:var(--hover-bg)}.theme-toggle svg{width:18px;height:18px;color:var(--txt-primary)}.practice-card{margin-bottom:48px;background:var(--card-bg);border-radius:var(--card-radius);overflow:hidden;box-shadow:var(--elevation-shadow-2)}.practice-card-head{display:flex;align-items:center;justify-content:space-between;min-height:45px;padding:12px var(--learning-card-x-padd);border-bottom:1px solid var(--border-color)}.practice-card-title{display:flex;align-items:center;color:var(--txt-intense);font-size:17px;font-weight:600;margin:0}.practice-card-title svg{margin-right:8px;color:var(--txt-brand)}.practice-card-body{position:relative;font-size:16px;padding:16px var(--learning-card-x-padd) var(--learning-card-b-padd);color:var(--txt-intense);background:var(--card-bg)}.practice-card-body hr{border-color:var(--border-color)}.lrn-content{color:var(--txt-intense);line-height:1.7}.lrn-content p{margin-bottom:16px}.lrn-content li{list-style:none}.lrn-content li,.lrn-summary li{margin-bottom:8px}.lrn-content strong{font-weight:500}.lrn-content mark{background:transparent;padding:0;border-radius:4px}[data-theme=dark] .lrn-content mark{background:transparent;color:transparent}.lrn-introduction,.lrn-pattern{margin-bottom:45px}.lrn-pattern{background:#f7faff;border:1px solid #a6d1ff;border-radius:var(--card-radius)}[data-theme=dark] .lrn-pattern{background:#1c2330;border-color:#2b4661}.lrn-pattern .box-title{background:#e5edff;margin:-20px -20px 16px;padding:12px 20px;font-size:16px;font-weight:600;border-bottom:1px solid #a6d1ff;border-radius:var(--card-radius) var(--card-radius) 0 0}[data-theme=dark] .lrn-pattern 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.box-title{background:#231e30;border-color:#3d3a66}.practice-question-text{white-space:pre-wrap;margin-bottom:20px}.practice-options{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}.practice-option-label{display:flex;align-items:center;padding:14px 16px;background:var(--card-bg);border:2px solid var(--border-color);border-radius:var(--button-radius);cursor:pointer;transition:all var(--hover-transition-duration)}.practice-option-label:hover{border-color:var(--txt-brand);background:var(--hover-bg)}.practice-option-label.selected{border-color:var(--txt-brand);background:var(--active-bg)}.practice-option-label.correct{border-color:var(--success-color);background:#f7fef8;color:#f7fef8}[data-theme=dark] .practice-option-label.correct{background:#064e3b;color:#6ee7b7}.practice-option-label.incorrect{border-color:var(--error-color);background:#fef2f2;color:#991b1b}[data-theme=dark] .practice-option-label.incorrect{background:#7f1d1d;color:#fca5a5}.practice-option-label 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