.qna-page{max-width:1000px;margin:0 auto;padding-bottom:4rem;color:#111;-webkit-font-smoothing:antialiased}.qna-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:.4rem;font-size:.82rem;color:var(--bs-gray);margin-bottom:24px}.qna-breadcrumb a{color:var(--brand-primary,#5f56fe);text-decoration:none;font-weight:500;white-space:nowrap}.qna-breadcrumb a:hover{text-decoration:underline}.qna-breadcrumb-sep{color:#cbd5e1;white-space:nowrap}.qna-breadcrumb span:last-child{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:300px}.qna-header{margin-bottom:2rem}.qna-meta-row{display:flex;align-items:center;gap:.6rem;margin-bottom:24px;flex-wrap:wrap}.qna-pill{display:inline-flex;align-items:center;gap:.3rem;padding:.3rem .75rem;border-radius:50px;font-size:.75rem;font-weight:600;letter-spacing:.02em}.qna-pill.subject{background:var(--brand-primary-light,#eeecff);color:var(--brand-primary,#5f56fe)}.qna-pill.type{background:#f0fdf4;color:#16a34a}.qna-pill.difficulty{background:#f8fafc;color:var(--bs-gray);border:1px solid rgba(0,0,0,.06)}.qna-title{font-size:1.85rem;font-weight:800;color:#111;letter-spacing:-.025em;line-height:1.25;margin:0}.qna-direct-answer{padding:1.25rem 1.5rem;background:linear-gradient(135deg,#f0fdf4,#ecfdf5);border:1px solid #bbf7d0;border-left:4px solid var(--state-strong,#10b981);border-radius:12px;margin-bottom:2rem;font-size:1.08rem;line-height:1.85;color:#166534}.qna-direct-answer code{background:rgba(16,185,129,.12);padding:.15rem .45rem;border-radius:5px;font-family:JetBrains Mono,monospace;font-size:.9em;color:#047857;font-weight:500}.qna-section{background:var(--bg-white,#fff);border-radius:16px;margin-bottom:1.5rem;border:1px solid rgba(95,86,254,.08);box-shadow:0 1px 3px rgba(0,0,0,.04);overflow:hidden;transition:box-shadow .25s ease,transform .25s ease}.qna-section:hover{box-shadow:0 8px 30px -8px rgba(0,0,0,.08);transform:translateY(-1px)}.qna-section-header{padding:.9rem 1.5rem;background:#f8fafc;border-bottom:1px solid rgba(95,86,254,.08);display:flex;align-items:center;gap:.65rem}.qna-section-icon{width:30px;height:30px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:.9rem;flex-shrink:0}.qna-section-title{font-size:1rem;font-weight:700;color:#111;margin:0}.qna-section-body{padding:1.5rem 1.75rem}.qna-section-icon.examples{background:#fef3c7}.qna-section-icon.logic{background:#ede9fe}.qna-section-icon.algorithm{background:#dbeafe}.qna-section-icon.code{background:#f1f3f5}.qna-section-icon.dryrun{background:#cffafe}.qna-section-icon.explain{background:#fce7f3}.qna-section-icon.alternatives{background:#d1fae5}.qna-section-icon.complexity{background:#fef9c3}.qna-section-icon.tip{background:#d1fae5}.qna-section-icon.mistake{background:#fee2e2}.qna-section-icon.generic{background:var(--brand-primary-light,#eeecff)}.qna-rich-text{font-size:1.02rem;line-height:1.85;color:#374151}.qna-rich-text p{margin:0 0 .85rem}.qna-rich-text p:last-child{margin-bottom:0}.qna-rich-text strong{color:#111;font-weight:600}.qna-rich-text code{background:rgba(95,86,254,.08);padding:.15rem .4rem;border-radius:4px;font-family:JetBrains Mono,monospace;font-size:.87em;color:var(--brand-primary,#5f56fe)}.qna-rich-text ol,.qna-rich-text ul{margin:.5rem 0 .85rem;padding-left:1.5rem}.qna-rich-text li{margin-bottom:.4rem;line-height:1.7}.qna-code-block{margin:1rem 0;border-radius:12px;overflow:hidden;background:#f6f8fa;border:1px solid #e1e4e8}.qna-code-block:first-child{margin-top:0}.qna-code-header{padding:.65rem 1.15rem;background:#f1f3f5;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e1e4e8}.qna-code-lang{font-size:.8rem;font-weight:600;color:#111;text-transform:capitalize}.qna-code-copy{width:30px;height:30px;background:transparent;border:1px solid #d0d7de;border-radius:6px;color:var(--bs-gray);cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center;padding:0}.qna-code-copy:hover{background:#fff;border-color:var(--brand-primary,#5f56fe);color:var(--brand-primary,#5f56fe)}.qna-code-copy svg{width:15px;height:15px}.qna-code-content{padding:1.15rem 1.35rem;font-family:JetBrains Mono,SF Mono,Monaco,monospace;font-size:.88rem;line-height:1.7;color:#24292f;overflow-x:auto;white-space:pre;max-width:100%}.qna-code-content .hl-kw{color:#8250df;font-weight:500}.qna-code-content .hl-fn{color:#8250df}.qna-code-content .hl-str{color:#0a3069}.qna-code-content .hl-num{color:#cf5a00}.qna-code-content .hl-cmt{color:#6e7781;font-style:italic}.qna-output-block{margin:.5rem 0 1rem;border-radius:10px;overflow:hidden;border:1px solid #1e293b}.qna-output-header{padding:.55rem 1rem;background:#1e293b;display:flex;align-items:center;gap:.5rem}.qna-output-label{font-size:13px;font-weight:600;color:#94a3b8}.qna-output-dot{width:7px;height:7px;border-radius:50%;background:#4ade80}.qna-output-body{padding:1rem 1.25rem;background:#0f172a;font-family:JetBrains Mono,monospace;font-size:.87rem;line-height:1.7;color:#4ade80;white-space:pre-wrap}.qna-examples-grid{display:flex;flex-direction:column;gap:.65rem}.qna-example-row{display:flex;gap:.75rem;align-items:center}.qna-example-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;white-space:nowrap;width:52px;flex-shrink:0}.qna-example-label.input{color:var(--brand-primary,#5f56fe)}.qna-example-label.output{color:var(--state-strong,#10b981)}.qna-example-value{font-family:JetBrains Mono,monospace;font-size:.88rem;padding:.5rem .85rem;background:#f8fafc;border:1px solid rgba(0,0,0,.06);border-radius:8px;color:#111;flex:1 1;word-break:break-word}.qna-algo-steps{display:flex;flex-direction:column;gap:.6rem;counter-reset:algo}.qna-algo-step{display:flex;align-items:flex-start;gap:.85rem;padding:.75rem 1rem;background:#f8fafc;border:1px solid rgba(0,0,0,.05);border-radius:10px;font-size:.98rem;line-height:1.6;color:#374151;counter-increment:algo}.qna-algo-num{width:28px;height:28px;background:var(--brand-primary,#5f56fe);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;flex-shrink:0}.qna-dryrun-steps{display:flex;flex-direction:column;gap:.85rem;margin-bottom:1.25rem}.qna-dryrun-step{display:flex;gap:1rem}.qna-dryrun-num{width:32px;height:32px;background:#f59e0b;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;flex-shrink:0}.qna-dryrun-content{flex:1 1}.qna-dryrun-content h4{font-size:16px;font-weight:700;color:#111;margin:0 0 .3rem}.qna-dryrun-content p{font-size:16px;color:#4b5563;line-height:1.65;margin:0}.qna-dryrun-content code{background:rgba(245,158,11,.12);padding:.1rem .35rem;border-radius:4px;font-family:JetBrains Mono,monospace;font-size:.87em;color:#b45309}.qna-explain-steps{display:flex;flex-direction:column;gap:.75rem}.qna-explain-step{padding:.85rem 1.15rem;background:linear-gradient(135deg,#fdf2f8,#fff);border:1px solid #fbcfe8;border-radius:10px}.qna-explain-step h4{font-size:.92rem;font-weight:700;color:#be185d;margin:0 0 .35rem}.qna-explain-step p{font-size:16px;color:#4b5563;line-height:1.7;margin:0}.qna-explain-step code{background:rgba(190,24,93,.08);padding:.1rem .35rem;border-radius:4px;font-family:JetBrains Mono,monospace;font-size:.87em;color:#be185d}.qna-alternatives{display:flex;flex-direction:column;gap:1.25rem}.qna-alt-item{border:1px solid rgba(0,0,0,.06);border-radius:12px;overflow:hidden}.qna-alt-header{padding:.75rem 1.15rem;background:linear-gradient(135deg,#f0fdf4,#f8fafc);border-bottom:1px solid rgba(0,0,0,.05);display:flex;align-items:center;justify-content:space-between;gap:.5rem}.qna-alt-method{font-size:.9rem;font-weight:700;color:#047857}.qna-alt-body{padding:1rem 1.15rem}.qna-alt-body .qna-code-block{margin-top:0}.qna-alt-note{font-size:.82rem;color:var(--bs-gray);line-height:1.5;padding:.75rem 1.15rem;background:#fafafa;border-top:1px solid rgba(0,0,0,.04)}.qna-table-wrap{overflow-x:auto;margin:.75rem 0;border-radius:10px;border:1px solid #e1e4e8}.qna-table{width:100%;border-collapse:collapse;font-size:.9rem}.qna-table th{padding:.75rem 1rem;background:#f1f3f5;font-weight:700;font-size:.82rem;color:#111;text-align:left;border-bottom:2px solid #e1e4e8;white-space:nowrap}.qna-table td{padding:.7rem 1rem;color:#374151;border-bottom:1px solid #f1f3f5;line-height:1.5}.qna-table tr:last-child td{border-bottom:none}.qna-table tr:hover td{background:#f8fafc}.qna-table code{background:rgba(95,86,254,.07);padding:.1rem .35rem;border-radius:3px;font-family:JetBrains Mono,monospace;font-size:.85em;color:var(--brand-primary,#5f56fe)}.qna-inline-card{display:flex;align-items:flex-start;gap:.85rem;padding:1rem 1.25rem;border-radius:11px;margin-bottom:1.5rem;font-size:.98rem;line-height:1.7}.qna-inline-card.tip{background:linear-gradient(135deg,#f0fdf4,#fff);border:1px solid #bbf7d0;color:#166534}.qna-inline-card.mistake{background:linear-gradient(135deg,#fef2f2,#fff);border:1px solid #fecaca;color:#991b1b}.qna-inline-card-icon{width:28px;height:28px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.85rem;flex-shrink:0}.qna-inline-card.tip .qna-inline-card-icon{background:#d1fae5}.qna-inline-card.mistake .qna-inline-card-icon{background:#fee2e2}.qna-inline-card code{font-family:JetBrains Mono,monospace;font-size:.87em;padding:.1rem .35rem;border-radius:4px}.qna-inline-card.tip code{background:rgba(16,185,129,.12);color:#047857}.qna-inline-card.mistake code{background:rgba(239,68,68,.1);color:#dc2626}.qna-takeaways{display:flex;flex-direction:column;gap:.6rem;margin-bottom:2rem}.qna-takeaway{display:flex;align-items:flex-start;gap:.85rem;padding:.85rem 1.15rem;background:linear-gradient(135deg,#f0fdf4,#fff);border:1px solid #bbf7d0;border-radius:10px}.qna-takeaway-check{width:22px;height:22px;background:var(--state-strong,#10b981);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}.qna-takeaway-check svg{width:12px;height:12px}.qna-takeaway-text{font-size:16px;color:#1f2937;line-height:1.6}.qna-takeaway-text code{background:rgba(16,185,129,.1);padding:.1rem .35rem;border-radius:4px;font-family:JetBrains Mono,monospace;font-size:.87em;color:#047857}.qna-related{padding:1.25rem 1.5rem;background:#f8fafc;border:1px solid rgba(0,0,0,.06);border-radius:14px;margin-bottom:2rem}.qna-related-label{font-size:13px;font-weight:700;color:var(--bs-gray);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.75rem}.qna-related-links{display:flex;flex-wrap:wrap;gap:.5rem}.qna-related-link{display:inline-flex;align-items:center;gap:.3rem;padding:.4rem .85rem;background:#fff;border:1px solid rgba(95,86,254,.15);border-radius:50px;font-size:.82rem;font-weight:500;color:var(--brand-primary,#5f56fe);text-decoration:none;transition:all .2s ease;cursor:pointer}.qna-related-link:hover{background:var(--brand-primary-light,#eeecff);border-color:var(--brand-primary,#5f56fe);transform:translateY(-1px)}@media (max-width:768px){.qna-page{padding-bottom:3rem}.qna-title{font-size:1.45rem}.qna-section-body{padding:1.15rem 1.25rem}.qna-example-row{flex-direction:column;align-items:flex-start;gap:.3rem}.qna-example-label{width:auto}.qna-alt-header{flex-direction:column;align-items:flex-start;gap:.25rem}.qna-dryrun-step{gap:.65rem}}@media (max-width:480px){.qna-title{font-size:1.25rem}.qna-direct-answer{padding:1rem 1.15rem;font-size:1rem}.qna-code-content{font-size:.82rem;padding:1rem}}.qna-layout{display:flex;min-height:100vh;overflow-x:hidden;max-width:100vw}.qna-layout.has-sidebar .qna-page{transition:margin-left .3s cubic-bezier(.16,1,.3,1)}.qna-layout.has-sidebar .qna-page.sidebar-open{margin-left:280px}.qna-sidebar-toggle{position:fixed;top:1rem;left:1rem;width:44px;height:44px;background:var(--bg-white,#fff);border:1px solid rgba(95,86,254,.08);border-radius:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:101;transition:all .3s cubic-bezier(.16,1,.3,1);box-shadow:0 1px 3px rgba(0,0,0,.06);padding:0;color:#111}.qna-sidebar-toggle:hover{border-color:var(--brand-primary,#5f56fe);box-shadow:0 4px 12px rgba(0,0,0,.08)}.qna-sidebar-toggle svg{width:20px;height:20px}.qna-sidebar-toggle.shifted{left:calc(280px + 1rem)}.qna-sidebar{position:fixed;top:0;left:0;width:280px;height:100vh;background:var(--bg-white,#fff);border-right:1px solid rgba(95,86,254,.08);z-index:100;display:flex;flex-direction:column;transition:transform .3s cubic-bezier(.16,1,.3,1);overflow:hidden}.qna-sidebar.collapsed{transform:translateX(-100%)}.qna-sidebar-header{padding:16px;border-bottom:1px solid rgba(95,86,254,.08);flex-shrink:0}.qna-sidebar-label{font-size:12px;font-weight:700;color:var(--bs-gray);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.65rem}.qna-sidebar-subject-row{display:flex;align-items:center;gap:.7rem;padding:0 16px}.qna-sidebar-subject-icon{width:40px;height:40px;background:linear-gradient(135deg,var(--brand-primary,#5f56fe) 0,#8b7ffd 100%);border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:1.15rem;box-shadow:0 6px 20px rgba(95,86,254,.25)}.qna-sidebar-subject-info{flex:1 1}.qna-sidebar-subject-name{font-size:16px;font-weight:700;color:#111}.qna-sidebar-subject-meta{font-size:12px;color:var(--bs-gray)}.qna-sidebar-search-container{padding:0 16px;border-top:1px solid rgba(95,86,254,.08)}.qna-sidebar-search{width:100%;display:grid;grid-template-columns:16px auto 20px;align-items:center;grid-gap:.5rem;gap:.5rem;padding:8px 5px 8px 10px;background:#f8fafc;border:1px solid rgba(0,0,0,.06);border-radius:10px;flex-shrink:0;transition:border-color .2s ease}.qna-sidebar-search:focus-within{border-color:var(--brand-primary,#5f56fe);background:#fff}.qna-sidebar-search-icon{width:16px;color:var(--bs-gray);flex-shrink:0}.qna-sidebar-search-icon svg{width:16px;height:16px}.qna-sidebar-search-input{width:100%;border:none;outline:none;background:transparent;font-size:.82rem;color:#111}.qna-sidebar-search-input::placeholder{color:#94a3b8}.qna-sidebar-search-clear{width:20px;height:20px;background:none;border:none;padding:0;cursor:pointer;color:var(--bs-gray);display:flex;align-items:center;justify-content:center}.qna-sidebar-search-clear svg{width:15px;height:15px}.qna-sidebar-topics{flex:1 1;overflow-y:auto;scrollbar-width:thin}.qna-sidebar-topics::-webkit-scrollbar{width:4px}.qna-sidebar-topics::-webkit-scrollbar-thumb{background:var(--brand-primary-medium);border-radius:2px}.qna-sidebar-topic{border-bottom:1px solid rgba(95,86,254,.06)}.qna-sidebar-topic-header{display:flex;align-items:center;justify-content:space-between;padding:.75rem .9rem;cursor:pointer;transition:background .15s ease;background:none;border:none;width:100%;text-align:left;font-family:inherit}.qna-sidebar-topic-header:hover{background:#f8fafc}.qna-sidebar-topic-left{display:flex;align-items:center;gap:.5rem;flex:1 1;min-width:0}.qna-sidebar-topic-name{font-size:15px;font-weight:700;color:#111;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.qna-sidebar-topic-count{font-size:.68rem;color:var(--bs-gray);padding:.15rem .45rem;background:#f1f5f9;border-radius:50px;flex-shrink:0}.qna-sidebar-query-list{overflow:hidden;transition:max-height .3s ease}.qna-sidebar-query{display:flex;align-items:center;gap:8px;padding:12px 15px 12px 30px;cursor:pointer;transition:all .15s ease;position:relative;text-decoration:none;background:none;border:none;width:100%;text-align:left;font-family:inherit;color:inherit}.qna-sidebar-query:before{content:"";position:absolute;left:18px;top:0;bottom:0;width:1.5px;background:rgba(95,86,254,.08)}.qna-sidebar-query:last-child:before{bottom:50%}.qna-sidebar-query:hover{background:var(--hover-bg-color)}.qna-sidebar-query.active{background:var(--brand-primary-light,#eeecff)}.qna-sidebar-query.active:after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--brand-primary,#5f56fe);border-radius:0 2px 2px 0}.qna-sidebar-query-icon{font-size:16px;flex-shrink:0;width:22px;height:22px;text-align:center;color:#3d3d3d;display:inline-flex;align-items:center;justify-content:center}.qna-sidebar-query-icon svg{display:block}.qna-sidebar-query-title{font-size:14px;font-weight:500;color:#111;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1 1;line-height:1.4}.qna-sidebar-query.active .qna-sidebar-query-title{color:var(--brand-primary,#5f56fe);font-weight:600}.qna-sidebar-overlay{display:none}@media (max-width:1024px){.qna-layout.has-sidebar .qna-page.sidebar-open{margin-left:0}.qna-sidebar-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:99;animation:fadeOverlay .2s ease}@keyframes fadeOverlay{0%{opacity:0}to{opacity:1}}}@media (max-width:768px){.qna-sidebar{width:260px}.qna-sidebar-toggle.shifted{left:calc(260px + .75rem)}}.qna-related-mesh{padding-top:2rem;gap:1.75rem}.qna-mesh-block,.qna-related-mesh{display:flex;flex-direction:column}.qna-mesh-block{gap:.5rem}.qna-mesh-block.same-topic-block{display:none}.qna-mesh-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:#9ca3af;margin:0 0 .15rem}.qna-mesh-label strong{color:#374151;font-weight:700;text-transform:none;letter-spacing:0;font-size:.78rem}.qna-mesh-list{display:flex;flex-direction:column;gap:10px}.qna-mesh-item{display:flex;align-items:center;gap:10px;padding:12px;border-radius:8px;font-size:14px;font-weight:500;color:#374151;text-decoration:none;background:#fafafa;border:1px solid #f0f0f0;transition:background .14s,border-color .14s,color .14s}.qna-mesh-item.same-topic{border-left:3px solid #e5ccff}.qna-mesh-item.same-topic:hover{background:#fdf5ff;border-color:var(--brand-primary);color:var(--brand-primary)}.qna-mesh-item.token-match{border-left:3px solid #bbdaff}.qna-mesh-item.token-match:hover{background:#f1f7ff;border-color:var(--outcome-gradual);color:var(--outcome-gradual)}.qna-mesh-item.neighbor{border-left:3px solid #b5fde5}.qna-mesh-item.neighbor:hover{background:#eefff9;border-color:#05af76;color:#047857}.qna-mesh-item-icon{font-size:.88rem;flex-shrink:0;line-height:1;opacity:.7;transition:opacity .14s,transform .14s}.qna-mesh-item-title{flex:1 1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qna-mesh-item-tag{flex-shrink:0;font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;padding:.15rem .45rem;border-radius:99px;background:#f3f4f6;color:#6b7280;white-space:nowrap}.qna-mesh-item-tag.muted{background:transparent;color:#9ca3af;font-weight:500;text-transform:none;letter-spacing:0;font-size:12px}.qna-mesh-item-arrow{flex-shrink:0;font-size:12px;opacity:.7;transition:opacity .14s,transform .14s}.qna-mesh-item:hover .qna-mesh-item-icon{opacity:.9}.qna-mesh-item:hover .qna-mesh-item-arrow{opacity:.9;transform:translateX(2px)}@media (max-width:767px){.qna-mesh-block.same-topic-block{display:flex}.qna-mesh-item-title{white-space:normal}.qna-mesh-item-tag{display:none}}:root{--elevationShadow2:0 2px 8px #00000021,0 0 1px #00000030;--cardRadius:12px;--buttonRadius:8px;--learningCardXPadd:20px;--learningCardBPadd:24px}.learning-page-container{position:relative;min-height:100dvh;color:var(--txt-primary);background:var(--page-bg)}.learning-inner-container,.practice-main-section{position:relative;width:100%;display:flex}.practice-main-section{min-height:100dvh;flex-direction:column;justify-content:space-between;overflow-x:hidden}.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}@media (min-width:1200px){.practice-main-content{width:95%;max-width:1200px}}@media (min-width:1400px){.practice-main-content{width:100%;display:flex;flex:1 1}}@media (max-width:1400px){.practice-main-content{max-width:1200px}}.learning-inner-wrapper{max-width:1200px;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-title{font-size:28px;font-weight:700;color:var(--txt-intense);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{background:var(--card-bg);border-radius:var(--cardRadius);box-shadow:var(--elevationShadow2)}.practice-card-head{padding:12px var(--learningCardXPadd);border-bottom:1px solid var(--border-color)}.practice-card-title{color:var(--txt-intense);font-weight:600}.practice-card-title svg{margin-right:8px;font-size:20px;color:var(--txt-brand)}.practice-card-body{padding:16px var(--learningCardXPadd) var(--learningCardBPadd);color:var(--txt-intense);background:var(--card-bg)}.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{justify-content:space-between;padding-bottom:4px;margin-bottom:16px;color:var(--txt-intense);font-weight:500}.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%);background-size:200% 100%;animation:skeleton-loading 1.5s infinite;border-radius:var(--buttonRadius)}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.module-error{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;text-align:center;padding:40px}.module-error-image{max-width:300px;margin-bottom:24px}.module-error p{font-size:17px;color:var(--txt-primary);margin-top:16px}.practice-question-toggle-btn{color:var(--txt-primary);background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--buttonRadius)}.practice-question-toggle-btn:hover{background:var(--secondary-hover-bg)}.practice-question-toggle-btn.active{border-bottom:3px solid var(--btn-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 (min-width:576px){.practice-bottom-navigation-outer{display:none}}.practice-bottom-navigation-inner{--bottomNavHeight:40px;width:100%;display:flex;align-items:center;justify-content:center;flex-direction:row}.practice-bottom-module-nav{width:var(--bottomNavHeight);height:var(--bottomNavHeight);display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--txt-brand);background-color:var(--card-bg);border-radius:5px;border:1px solid var(--border-color);box-shadow:0 0 3px rgba(0,0,0,.1);cursor:pointer}.practice-bottom-module-nav.non-clickable{cursor:not-allowed;opacity:.6}.practice-bottom-module-nav:not(.non-clickable):hover{background-color:var(--secondary-hover-bg)}.practice-bottom-section-bars-wrapper{flex:1 1;display:flex;align-items:center;justify-content:center;border-radius:5px;border:1px solid var(--border-color);box-shadow:0 0 3px rgba(0,0,0,.1);overflow:hidden}.practice-bottom-section-bar{flex:1 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:1200px;--dboardMainContentXAxisPadd:40px}}.mw-75ch{max-width:75ch}.weight-500{font-weight:500}.weight-600{font-weight:600}.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}.stats-toggler{display:flex;align-items:center;justify-content:center;gap:8px;padding:8px 12px;font-size:16px;font-weight:500;line-height:normal;border-radius:25px;cursor:not-allowed;color:var(--txt-intense);background:transparent;border:1px solid var(--border-color);transition:background .2s}.stats-toggler svg{font-size:18px}.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::-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-wrapper::-webkit-scrollbar{display:none}.syllabus-group-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;font-size:14px;font-weight:600;color:var(--txt-intense,#1f2937);cursor:pointer;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{display:flex;align-items:center;gap:8px;padding:12px 16px;font-size:14px;color:var(--txt-primary);text-decoration:none;cursor:pointer;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-item.upcoming{cursor:not-allowed}.syllabus-icon-wrapper{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;font-size:16px;flex-shrink:0;color:currentColor}.syllabus-icon-wrapper svg{display:block}.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{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;height:40px;padding:0 16px;font-size:14px;font-weight:600;color:#fff;background:var(--btn-bg);border:none;border-radius:8px;cursor:pointer;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}}[data-theme=dark] .practice-side-menu-container{background:var(--card-bg,#1a1a1a);border-right-color:var(--border-color,#374151)}[data-theme=dark] .practice-side-action-wrapper{background:var(--card-bg,#1a1a1a)}[data-theme=dark] .side-nav-header{background:var(--card-bg,#1a1a1a);border-bottom-color:var(--border-color,#374151)}[data-theme=dark] .syllabus-cta-container{border-top-color:var(--border-color,#374151)}.gap-2{gap:8px}.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)}.side-menu-wrapper-inner{flex:1 1;overflow-y:auto;overflow-x:hidden}.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 .breadcrumb-list-item{position:relative;display:inline-flex;align-items:center;line-height:normal}.breadcrumb-nav .breadcrumb-list-item:not(:first-child){margin-left:4px}.breadcrumb-nav .breadcrumb-connector{margin-right:4px;font-size:10px;color:var(--txt-secondary,#6c757d)}[data-theme=dark] .breadcrumb-nav .breadcrumb-connector{color:var(--txtGreyColor,#999)}.breadcrumb-nav .breadcrumb-home{display:inline-flex;align-items:center;cursor:pointer;color:var(--txt-secondary,#6c757d);transition:color .2s}.breadcrumb-nav .breadcrumb-home:hover{color:var(--txtBrandColor,#635bff)}[data-theme=dark] .breadcrumb-nav .breadcrumb-home{color:var(--txtGreyColor,#999)}[data-theme=dark] .breadcrumb-nav .breadcrumb-home:hover{color:#8781f7}.breadcrumb-nav .breadcrumb-ellipsis{display:inline-block;cursor:pointer;color:var(--txt-secondary,#6c757d);font-size:18px;padding:0 4px;transition:color .2s}.breadcrumb-nav .breadcrumb-ellipsis:hover{color:var(--txtBrandColor,#635bff)}[data-theme=dark] .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:16px}}: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}[data-theme=dark]{--bg-color:#1a1a1a;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--border-color:#374151;--pill-bg:#262626}.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;align-items:center}.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}ol,ul{margin-bottom:0!important}.lrn-introduction{border-radius:8px;overflow:hidden;margin-bottom:48px;background:#fff;border:1px solid var(--border-color,#e5e7eb)}.lrn-introduction h2{margin:0!important;padding:12px 20px!important;font-size:16px!important;font-weight:600!important;background:#f8fafc;border-bottom:1px solid var(--border-color,#e5e7eb);color:var(--txt-intense)}.lrn-introduction .box-content{padding:12px 20px}[data-theme=dark] .lrn-introduction{background:#1f2933;border-color:#334155}[data-theme=dark] .lrn-introduction h2{background:#1e293b;border-bottom-color:#334155}.lrn-content{line-height:1.75;color:var(--txt-intense);font-size:17}.lrn-content h1,.lrn-content h2{font-weight:600;color:var(--txt-intense)}.lrn-content h2{font-weight:500;font-size:24px;margin-bottom:16px;margin-top:32px}.lrn-content h2:first-child{margin-top:0}.lrn-content p{margin:8px 0}.lrn-content ol,.lrn-content ul{padding-left:1.25rem;list-style:none}.lrn-content ul{padding-left:0}.lrn-pattern,.lrn-summary,.question-box,.solution-box{border-radius:8px;overflow:hidden;margin-bottom:48px}.box-title{margin:0!important;padding:12px 20px!important;font-size:15px!important;font-weight:600!important;color:var(--txt-intense)}.box-content{padding:8px 20px}.lrn-pattern{background:#f7faff;border:1px solid #a6d1ff}.lrn-pattern .box-title{background:#e5edff;border-bottom:1px solid #a6d1ff}[data-theme=dark] .lrn-pattern{background:#1c2330;border-color:#2b4661}[data-theme=dark] .lrn-pattern .box-title{background:#222a3a;border-bottom-color:#2b4661}.question-box{background:#fff7f7;border:1px solid #ffa6a6;margin-bottom:32px}.question-box .box-title{background:#fff0f0;border-bottom:1px solid #ffa6a6}[data-theme=dark] .question-box{background:#322;border-color:#663a3a}[data-theme=dark] .question-box .box-title{background:#3e2525;border-bottom-color:#663a3a}.solution-box{background:#f7fff9}.solution-box .box-title{background:#e4ffe9;border-bottom:1px solid #a5e3c6}[data-theme=dark] .solution-box{background:#1e2a22;border-color:#2e5142}[data-theme=dark] .solution-box .box-title{background:#233229;border-bottom-color:#2e5142}.solution-box ul{list-style:none;margin:8px 0;padding-left:1.5rem}.solution-box ul li{position:relative;margin-bottom:0;padding-left:20px}.solution-box ul li:before{content:"->";position:absolute;left:0;font-size:17px;color:#000}.solution-box ol li h4{font-size:18px;margin:16px 0 4px;padding-bottom:0}.lrn-summary{background:#fbf7ff;border:1px solid #bebbff}.lrn-summary .box-title{background:#f4f0ff;border-bottom:1px solid #bebbff}[data-theme=dark] .lrn-summary{background:#211b28;border-color:#3d3a66}[data-theme=dark] .lrn-summary .box-title{background:#231e30;border-bottom-color:#3d3a66}.lrn-variations li{background:var(--card-bg);border:1px solid var(--border-color);border-radius:8px;padding:12px 16px;margin-bottom:8px;list-style:none}.lrn-variations{margin-bottom:45px}.lrn-variations li,.lrn-variations>p{background:var(--card-bg,#fff);border:1px solid var(--border-color,#e5e7eb);border-radius:12px;padding:12px 20px;font-size:17px;line-height:1.5;color:var(--txt-intense,#1a1a2e);list-style:none;margin-top:16px}[data-theme=dark] .lrn-variations-list>*{background:#1e293b;border-color:#334155;color:#e2e8f0}.tricks-box{background:#f8f9fa;border:1px solid var(--border-color);border-radius:var(--card-radius);padding:12px 20px}.tricks-box ol,.tricks-box ul{margin-bottom:0}.solution-image-container{margin:auto;max-width:250px;width:100%}.solution-image{max-width:100%;height:auto;cursor:zoom-in}.solution-image-caption{margin-top:8px;font-size:13px;font-weight:500;color:var(--txt-secondary)}.lightbox-overlay{position:fixed;inset:0;background:hsla(0,0%,100%,.95);display:flex;justify-content:center;align-items:center;z-index:9999;cursor:zoom-out}.lightbox-overlay.dark-mode{background:rgba(0,0,0,.9)}.lightbox-image{max-width:90%;max-height:90%;border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,.2)}@media (min-width:768px){.lrn-content{font-size:17px}.box-title{font-size:16px!important}}.lrn-variations-table{width:100%;overflow-x:auto;margin-top:16px}.lrn-variations-table table{width:100%;border-collapse:collapse;font-size:17px;line-height:1.5;border:1px solid grey}.lrn-variations-table th{padding:12px 16px;font-weight:600;background:#fff}.lrn-variations-table td,.lrn-variations-table th{text-align:center;color:#000;border:1px solid grey}.lrn-variations-table td{padding:5px 15px;vertical-align:middle}.lrn-variations-table td:first-child{text-align:left}.lrn-variations-table tr:nth-child(2n){background:#f9f9f9}.lrn-variations-table caption,.lrn-variations-table p{padding:12px 0;color:#333}@media (max-width:768px){.lrn-variations-table{font-size:13px}.lrn-variations-table td,.lrn-variations-table th{padding:10px 12px}}.solution-box .box-content.has-table{overflow-x:auto}.solution-box .box-content.has-table table{width:-moz-fit-content;width:fit-content;min-width:300px;border-collapse:collapse;line-height:1.5;border:1px solid grey;margin:12px 0}.solution-box .box-content.has-table th{padding:10px 18px;text-align:center;font-weight:600;color:#000;border:1px solid grey;white-space:nowrap}.solution-box .box-content.has-table td{padding:8px 18px;border:1px solid grey;color:#000;vertical-align:middle;text-align:center}.solution-box .box-content.has-table td:first-child{text-align:left;white-space:nowrap}@media (max-width:768px){.solution-box .box-content.has-table table{min-width:100%;font-size:14px}.solution-box .box-content.has-table td,.solution-box .box-content.has-table th{padding:8px 12px}}.question-box .box-content.has-table{overflow-x:auto}.question-box .box-content.has-table table{width:-moz-fit-content;width:fit-content;min-width:300px;border-collapse:collapse;line-height:1.5;border:1px solid grey;margin:12px 0}.question-box .box-content.has-table th{padding:5px 15px;text-align:center;font-weight:600;color:#000;border:1px solid grey;white-space:nowrap}.question-box .box-content.has-table td{padding:5px 15px;border:1px solid grey;color:#000;vertical-align:middle;text-align:center}.question-box .box-content.has-table td:first-child{white-space:nowrap}@media (max-width:768px){.question-box .box-content.has-table table{min-width:100%;font-size:14px}.question-box .box-content.has-table td,.question-box .box-content.has-table th{padding:8px 12px}}.box-content.has-table caption,.practice-content.has-table caption{color:inherit}.practice-card{margin-bottom:48px;background:var(--card-bg,#fff);border-radius:var(--cardRadius,10px);overflow:hidden;box-shadow:var(--elevationShadow2,0 2px 8px #00000021)}[data-theme=dark] .practice-card{background:#212020;box-shadow:0 1px 3px #04040466}.practice-card-head{min-height:45px;display:flex;align-items:center;justify-content:space-between;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{display:flex;align-items:center;gap:8px;color:var(--txtHeadingColor,#111);font-size:17px;padding-bottom:0;margin: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{position:relative;font-size:16px;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{align-items:center;padding:12px 16px;font-weight:500;color:#4d4d4d;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{display:flex;align-items:center;justify-content:space-between;margin-top:24px;gap:16px}.practice-question-toggles-wrapper{display:none}@media (min-width:576px){.practice-question-toggles-wrapper{display:flex;gap:8px}}.practice-question-toggle-btn{display:flex;align-items:center;justify-content:center;width:35px;height:35px;padding:4px;font-size:14px;font-weight:500;color:#4d4d4d;background:#fff;border:1px solid var(--borderColor,#e5e7eb);border-radius:var(--buttonRadius,8px);cursor:pointer;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}.mb-4{margin-bottom:24px}.pb-3,.py-3{padding-bottom:12px}.py-3{padding-top:12px}.py-2{padding-top:8px;padding-bottom:8px}.mt-4{margin-top:24px}.d-flex{display:flex}.align-items-center{align-items:center}.justify-content-between{justify-content:space-between}.text-pre-wrap{white-space:pre-wrap}.site-fs-15{font-size:15px}.site-fs-18{font-size:18px}.site-fs-20{font-size:20px}.me-2{margin-right:8px}.me-3{margin-right:12px}@media (min-width:768px){.me-md-3{margin-right:12px}}.text-white{color:#fff}.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 table{margin:16px 20px;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{display:flex;flex-direction:column;gap:12px;margin-top:12px}.practice-option-label{display:flex;align-items:flex-start;gap:8px;padding:12px 14px;border-radius:10px;border:1px solid #e5e7eb;background-color:#fff;font-size:15px;line-height:1.5;color:#111827;cursor:pointer;transition:all .2s ease;-webkit-user-select:none;-moz-user-select:none;user-select:none}.practice-option-label:hover{background-color:#f9fafb;border-color:#d1d5db}.practice-option-label.selected{border-color:#2563eb;background-color:#eff6ff}.practice-option-label.correct{background-color:#16a34a;border-color:#16a34a;color:#fff}.practice-option-label.incorrect{background-color:#dc2626;border-color:#dc2626;color:#fff}.practice-option-label.correct:hover,.practice-option-label.incorrect:hover{background-color:inherit}.practice-option-label svg{flex-shrink:0;margin-top:2px}.practice-option-label span{display:block;word-break:break-word;font-size:16px}.dark .practice-option-label{background-color:#020617;border-color:#1e293b;color:#e5e7eb}.dark .practice-option-label:hover{background-color:#020617;border-color:#334155}.dark .practice-option-label.selected{background-color:rgba(37,99,235,.15);border-color:#2563eb}.dark .practice-option-label.correct{background-color:#16a34a;border-color:#16a34a;color:#fff}.dark .practice-option-label.incorrect{background-color:#dc2626;border-color:#dc2626;color:#fff}@media (max-width:640px){.practice-option-label{font-size:14px;padding:10px 12px}}.practice-helper-btns-wrapper{display:flex;align-items:center;gap:12px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}.practice-helper-btns-wrapper::-webkit-scrollbar{display:none}.practice-helper-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:#fff;border:1px solid #e5e7eb;border-radius:8px;cursor:pointer;white-space:nowrap;transition:all .2s ease;min-height:40px;box-shadow:0 1px 2px rgba(0,0,0,.05)}.practice-helper-btn:hover{background-color:#f9fafb}.helper-label{font-size:14px;font-weight:500;color:#374151}.icon-wrapper{display:flex;align-items:center;justify-content:center;font-size:16px}.green-icon{color:#10b981}.yellow-icon{color:#f59e0b}.red-icon{color:#ef4444}.report-icon{color:#6366f1}.red-icon img{height:25px}.helper-text img,.red-icon img{border-radius:4px}.green-icon img,.yellow-icon img{height:25px;border-radius:4px}.practice-helper-btn.active.variant-green{background-color:#f7fef8;border-color:#10b981}.practice-helper-btn.active.variant-yellow{background-color:#fffbeb;border-color:#f59e0b}.practice-helper-btn.active.variant-red{background-color:#fef2f2;border-color:#ef4444}.helper-content-box{margin-top:16px;padding:15px;border-radius:8px;border:1px solid transparent;font-size:15px;line-height:1.6}.animate-fade-in{animation:fadeIn .3s ease-in-out}.solution-box{background-color:#f7fef8;border:1px solid #a5e3c6}.padding-box{margin-top:20px;margin-bottom:0}.box-title{font-size:16px;font-weight:700;margin-bottom:8px;margin-top:0}.hint-box{background-color:#fffbeb;border-color:#fde68a}.helper-header-text{font-size:18px;font-weight:500;margin-right:2px}.mistake-box{background-color:#fef2f2;border-color:#fecaca}.helper-text{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:400;line-height:1.6;color:#202020}.helper-text img{width:25px;height:25px;flex-shrink:0;margin-top:2px;object-fit:contain}@media (max-width:768px){.helper-text{font-size:14px;gap:10px}.helper-text img{width:20px;height:20px}}.report-modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,.5);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:9999;display:flex;align-items:center;justify-content:center;padding:16px}.report-modal-card{background:#fff;width:100%;max-width:500px;border-radius:12px;box-shadow:0 10px 25px rgba(0,0,0,.1);display:flex;flex-direction:column;animation:slideUp .2s ease-out}.report-modal-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid #e5e7eb}.report-modal-header h4{margin:0;font-size:18px;font-weight:600;color:#111827}.report-close-icon{background:transparent;border:none;font-size:22px;cursor:pointer;color:#9ca3af;display:flex}.report-close-icon:hover{color:#111827}.report-modal-body{padding:20px;max-height:60vh;overflow-y:auto}.report-option-row{display:flex;flex-direction:column;margin-bottom:12px}.report-option-row input{display:none}.report-option-row{display:block}.report-option-row input[type=checkbox]{margin-right:10px;transform:scale(1.2)}.report-option-row label{font-size:15px;color:#374151;cursor:pointer}.report-textarea{width:100%;margin-top:12px;padding:10px;border:1px solid #d1d5db;border-radius:6px;font-family:inherit;font-size:14px;resize:vertical;outline:none}.report-textarea:focus{border-color:#6366f1}.report-modal-footer{padding:16px 20px;border-top:1px solid #e5e7eb;display:flex;justify-content:flex-end;gap:10px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.toast-box{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:10px;font-weight:500;color:var(--txt-primary,#4d4d4d);background:var(--card-bg,#fff);box-shadow:0 4px 12px rgba(0,0,0,.1),inset 0 0 0 1.5px var(--border-color,#e5e7eb);min-width:300px;max-width:400px}.toast-content{flex:1 1}.toast-title{font-size:14px;font-weight:600;color:var(--txt-intense,#1a1a2e);margin-bottom:2px}.toast-subtext{font-size:13px;font-weight:400;opacity:.85;color:var(--txt-primary,#4d4d4d);margin-top:2px}.toast-box svg{width:18px;height:18px;flex-shrink:0}.toast-box.success{background:#f0fdf4;box-shadow:0 4px 12px rgba(34,197,94,.15),inset 0 0 0 1.5px #86efac}.toast-box.success svg{color:#16a34a}.toast-box.warning{background:#fffbeb;box-shadow:0 4px 12px rgba(251,191,36,.15),inset 0 0 0 1.5px #fde68a}.toast-box.warning svg{color:#f59e0b}.toast-box.error{background:#fef2f2;box-shadow:0 4px 12px rgba(239,68,68,.15),inset 0 0 0 1.5px #fca5a5}.toast-box.error svg{color:#dc2626}.toast-box.info{background:#eff6ff;box-shadow:0 4px 12px rgba(59,130,246,.15),inset 0 0 0 1.5px #93c5fd}.toast-box.info svg{color:#2563eb}[data-theme=dark] .toast-box{background:var(--card-bg,#212020);color:var(--txt-primary,#ccc)}[data-theme=dark] .toast-title{color:var(--txt-intense,#e3e3e3)}[data-theme=dark] .toast-subtext{color:var(--txt-primary,#ccc)}[data-theme=dark] .toast-box.success{background:#064e3b;box-shadow:0 4px 12px rgba(0,0,0,.3),inset 0 0 0 1.5px #10b981}[data-theme=dark] .toast-box.success svg{color:#34d399}[data-theme=dark] .toast-box.warning{background:#451a03;box-shadow:0 4px 12px rgba(0,0,0,.3),inset 0 0 0 1.5px #f59e0b}[data-theme=dark] .toast-box.warning svg{color:#fbbf24}[data-theme=dark] .toast-box.error{background:#450a0a;box-shadow:0 4px 12px rgba(0,0,0,.3),inset 0 0 0 1.5px #ef4444}[data-theme=dark] .toast-box.error svg{color:#f87171}[data-theme=dark] .toast-box.info{background:#1e3a8a;box-shadow:0 4px 12px rgba(0,0,0,.3),inset 0 0 0 1.5px #3b82f6}[data-theme=dark] .toast-box.info svg{color:#60a5fa}@keyframes toast-enter{0%{opacity:0;transform:translateY(-20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes toast-exit{0%{opacity:1;transform:translateY(0) scale(1)}to{opacity:0;transform:translateY(-20px) scale(.95)}}@media (max-width:480px){.toast-box{min-width:280px;max-width:calc(100vw - 32px);padding:10px 14px}.toast-title{font-size:13px}.toast-subtext{font-size:12px}.toast-box svg{width:16px;height:16px}}.react-hot-toast{z-index:10000}.toast-box.toast-slide-right{--toast-accent:#5f56fe;background:hsla(0,0%,100%,.95);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid rgba(95,86,254,.15);border-left:4px solid var(--toast-accent);box-shadow:0 8px 20px -4px rgba(95,86,254,.15),0 4px 8px -2px rgba(0,0,0,.05);animation:toast-slide-in-right .6s cubic-bezier(.16,1,.3,1) forwards}.toast-box.toast-slide-right svg{color:#5f56fe!important;filter:drop-shadow(0 2px 4px rgba(95,86,254,.2))}.toast-box.toast-slide-right .toast-title{color:#2b2b3b}@keyframes toast-slide-in-right{0%{opacity:0;transform:translateX(120%)}to{opacity:1;transform:translateX(0)}}.mock-test-section{margin-bottom:24px}.mock-test-header-wrapper,.mock-test-icon-wrapper{display:flex;align-items:center}.mock-test-icon-wrapper{width:40px;height:40px;justify-content:center;color:#5f56fe;border-radius:10px;font-size:20px;flex-shrink:0}.mock-test-challenge{display:flex;flex-direction:column;gap:24px;padding:24px;background:linear-gradient(135deg,#667eea15,#764ba215);border-radius:12px;border:1px solid #e8eaf6}.mock-test-challenge.has-cta{flex-direction:row;align-items:center;justify-content:space-between}@media (max-width:768px){.mock-test-challenge.has-cta{flex-direction:column;align-items:flex-start}}.challenge-content{flex:1 1}.challenge-title{font-size:18px;font-weight:600;color:#111827;margin-bottom:8px;display:flex;align-items:center;gap:8px}.challenge-fire-icon{color:#f59e0b;font-size:20px}.challenge-description{font-size:15px;color:#4b5563;line-height:1.6;margin-bottom:16px}.test-features{display:flex;flex-wrap:wrap;gap:12px}.feature-badge{display:flex;align-items:center;gap:6px;padding:6px 12px;background:#fff;border:1px solid #e5e7eb;border-radius:6px;font-size:13px;font-weight:500;color:#374151}.feature-badge svg{color:#10b981;font-size:16px}.mock-test-cta-btn{display:flex;align-items:center;justify-content:center;gap:8px;min-width:200px;height:48px;padding:0 24px;font-size:15px;font-weight:600;color:#fff;background:#5f56fe;border:none;border-radius:8px;cursor:pointer;transition:all .2s ease;box-shadow:0 4px 12px rgba(102,126,234,.3)}.mock-test-cta-btn:hover{box-shadow:0 6px 20px rgba(102,126,234,.4)}.mock-test-cta-btn:active{transform:translateY(0)}.mock-test-cta-btn svg{font-size:18px}.mock-test-secondary-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;max-width:320px;height:44px;padding:0 20px;font-size:14px;font-weight:600;color:#667eea;background:#fff;border:2px solid #667eea;border-radius:8px;cursor:pointer;transition:all .2s ease}.mock-test-secondary-btn:hover{background:#667eea;color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px rgba(102,126,234,.3)}.mock-test-secondary-btn svg{font-size:16px}.test-history-divider{height:1px;background:#e5e7eb;margin:24px 0}.test-history-section{display:flex;flex-direction:column;gap:20px}.test-history-header{display:flex;align-items:center;justify-content:space-between}.test-history-title{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:600;color:#111827;margin:0}.test-history-title svg{color:#667eea;font-size:20px}.test-history-count{font-size:14px;color:#6b7280;background:#f3f4f6;padding:4px 12px;border-radius:12px}.test-history-list{display:flex;flex-direction:column;gap:10px}.quiz-history-item{display:flex;align-items:center;justify-content:space-between;padding:16px;background:#fafafa;border:1px solid #e5e7eb;border-radius:10px;cursor:pointer;transition:all .2s ease}.quiz-history-item:hover{background:#fff;border-color:#667eea;box-shadow:0 4px 12px rgba(102,126,234,.15);transform:translateY(-2px)}.quiz-history-left{display:flex;align-items:center;gap:12px}.quiz-test-badge{width:44px;height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:10px;font-size:12px;font-weight:700;flex-shrink:0;box-shadow:0 2px 8px rgba(102,126,234,.3)}.quiz-test-badge svg{font-size:16px;margin-bottom:2px}.quiz-test-info{display:flex;flex-direction:column;gap:4px}.quiz-test-name{font-weight:500;font-size:15px;color:#111827}.quiz-test-date{font-size:13px;color:#6b7280}.quiz-history-right{display:flex;align-items:center;gap:12px}.quiz-score-badge{padding:6px 14px;font-size:14px;font-weight:600;border-radius:8px;white-space:nowrap}.quiz-score-badge.success{background:#d1fae5;color:#065f46;border:1px solid #a7f3d0}.quiz-score-badge.warning{background:#fef3c7;color:#92400e;border:1px solid #fde68a}.quiz-score-badge.danger{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}.quiz-score-percentage{font-size:16px;font-weight:700;color:#667eea}@media (max-width:640px){.mock-test-challenge{padding:20px}.challenge-title{font-size:16px}.challenge-description{font-size:14px}.test-features{flex-direction:column}.mock-test-cta-btn{width:100%}.quiz-history-item{padding:12px}.quiz-test-badge{width:40px;height:40px}.quiz-history-right{flex-direction:column;align-items:flex-end;gap:4px}.quiz-score-percentage{font-size:14px}}[data-theme=dark] .mock-test-challenge{background:linear-gradient(135deg,#667eea20,#764ba220);border-color:#374151}[data-theme=dark] .challenge-title,[data-theme=dark] .quiz-test-name,[data-theme=dark] .test-history-title{color:#f1f5f9}[data-theme=dark] .challenge-description{color:#cbd5e1}[data-theme=dark] .feature-badge{background:#1e293b;border-color:#334155;color:#cbd5e1}[data-theme=dark] .test-history-count{background:#1e293b;color:#94a3b8}[data-theme=dark] .quiz-history-item{background:#1e293b;border-color:#334155}[data-theme=dark] .quiz-history-item:hover{background:#334155;border-color:#667eea}[data-theme=dark] .quiz-test-date{color:#94a3b8}[data-theme=dark] .test-history-divider{background:#334155}