:where(.exercises-container,.exercise-card-v2,.problem-card,.supervised-assessment){--xc-paper: #FBF8F1;--xc-paper-light: #FFFDF8;--xc-graphite: #202124;--xc-ink: #2453A6;--xc-ink-dark: #183E80;--xc-ink-pale: #EAF0FA;--xc-correction: #C6403D;--xc-correction-pale: #FFF1EE;--xc-line: #D8D2C7;--xc-highlight: #E5C755;--xc-teal: var(--xc-ink);--xc-teal-2: #3769BD;--xc-teal-pale: var(--xc-ink-pale);--xc-cyan: var(--xc-correction);--xc-cyan-pale: var(--xc-correction-pale);--xc-amber: #8A6410;--xc-amber-pale: #FFF8D8;--xc-slate-50: #F7F3EA;--xc-slate-100: #EFEAE1;--xc-slate-200: var(--xc-line);--xc-slate-300: #C1BAAE;--xc-slate-400: #706C66;--xc-slate-500: #67635E;--xc-slate-600: #4F4C47;--xc-slate-700: #383735;--xc-slate-800: #292A2C;--xc-slate-900: var(--xc-graphite);--xc-white: var(--xc-paper-light);--xc-green-500: #10B981;--xc-green-600: #059669;--xc-green-50: #ECFDF5;--xc-green-100: #D1FAE5;--xc-orange-500: #F59E0B;--xc-orange-600: #D97706;--xc-orange-700: #B45309;--xc-red-500: #EF4444;--xc-red-600: #DC2626;--xc-violet-600: #7C3AED;--xc-violet-700: #6D28D9;--xc-radius-sm: 4px;--xc-radius: 5px;--xc-radius-lg: 6px;--xc-radius-full: 9999px;--xc-font-heading: "Sora", system-ui, sans-serif;--xc-shadow-xs: none;--xc-shadow-sm: none;--xc-shadow-hover: none}.exercises-container{max-width:900px;margin:0 auto}.exercises-stats{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid var(--xc-slate-200)}.exercises-total{font-family:var(--xc-font-heading);font-size:.82rem;font-weight:600;color:var(--xc-slate-500);letter-spacing:.02em}.problems-stats{margin-bottom:1.25rem}.exercises-header{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1.5rem;padding:0 0 .85rem;background:transparent;border-radius:0;border:0;border-bottom:1px solid var(--xc-line)}.filter-btn{display:flex;align-items:center;gap:.5rem;padding:.55rem 1rem;border-radius:var(--xc-radius-sm);border:1px solid transparent;background:transparent;color:var(--xc-slate-500);font-family:var(--xc-font-heading);font-size:.8rem;font-weight:600;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);position:relative}.filter-btn:hover{color:var(--xc-slate-800);background:var(--xc-white);border-color:var(--xc-line)}.filter-btn.active{background:var(--xc-white);color:var(--xc-slate-900);border-color:currentColor;box-shadow:none}.filter-btn.active.easy{color:var(--xc-green-600)}.filter-btn.active.medium{color:var(--xc-orange-600)}.filter-btn.active.hard{color:var(--xc-red-500)}.filter-btn.active.advanced{color:var(--xc-violet-600)}.filter-color-dot{width:10px;height:10px;border-radius:3px;flex-shrink:0;opacity:.8;transition:opacity .2s}.filter-btn.active .filter-color-dot{opacity:1}.filter-btn:not(.active) .filter-color-dot{opacity:.5}.filter-count{background:var(--xc-slate-200);color:var(--xc-slate-600);font-size:.68rem;font-weight:700;padding:.1rem .45rem;border-radius:var(--xc-radius-sm);min-width:1.3rem;text-align:center;transition:all .2s}.filter-btn.active .filter-count{background:currentColor;color:var(--xc-white)}.exercise-notions{margin:0 0 1.25rem;padding:1rem 1.1rem;background:var(--xc-paper-light);border:1px solid var(--xc-line);border-left:4px solid var(--xc-ink);border-radius:var(--xc-radius)}.exercise-notions-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:.35rem .75rem;margin-bottom:.85rem}.exercise-notions-label{font-family:var(--xc-font-heading);font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--xc-slate-600)}.exercise-notions-hint{flex:1 1 16rem;font-size:.8rem;line-height:1.5;color:var(--xc-slate-500)}.exercise-notions-list{display:flex;flex-wrap:wrap;gap:.45rem}.notion-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.45rem .75rem;border:1px solid var(--xc-line);border-radius:var(--xc-radius-sm);background:var(--xc-paper);color:var(--xc-slate-600);font-family:var(--xc-font-heading);font-size:.78rem;font-weight:600;text-align:left;cursor:pointer;transition:border-color .15s,background .15s,color .15s}.notion-btn:hover{border-color:var(--xc-ink);color:var(--xc-ink);background:var(--xc-white)}.notion-btn.active{border-color:var(--xc-ink);background:var(--xc-ink);color:var(--xc-paper-light)}.notion-count{min-width:1.4rem;padding:.05rem .35rem;border-radius:var(--xc-radius-sm);background:var(--xc-ink-pale);color:var(--xc-ink-dark);font-size:.7rem;font-weight:700;text-align:center}.notion-btn.active .notion-count{background:#fffdf838;color:var(--xc-paper-light)}.exercise-series-nav{margin:0 0 2rem;padding:1rem;background:var(--xc-paper-light);border:1px solid var(--xc-line);border-left:4px solid var(--xc-ink);border-radius:var(--xc-radius)}.exercise-series-nav-label{display:block;margin-bottom:.65rem;color:var(--xc-ink);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.exercise-series-nav>div{display:flex;flex-wrap:wrap;gap:.5rem}.exercise-series-nav>.exercise-series-nav-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem}.exercise-series-nav-button{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:.7rem;align-items:center;min-height:3.4rem;padding:.7rem .75rem;color:var(--xc-slate-700);background:var(--xc-white);border:1px solid var(--xc-slate-200);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);text-align:left;cursor:pointer;transition:border-color .2s,color .2s,background .2s,box-shadow .2s}.exercise-series-nav-button:hover,.exercise-series-nav-button:focus-visible{color:var(--xc-teal);border-color:var(--xc-teal-2);box-shadow:none}.exercise-series-nav-button:focus-visible{outline:3px solid rgba(36,83,166,.2);outline-offset:2px}.exercise-series-nav-button.active{color:var(--xc-ink-dark);background:var(--xc-ink-pale);border-color:var(--xc-ink);box-shadow:none}.exercise-series-nav-number{display:grid;width:2rem;height:2rem;place-items:center;color:var(--xc-teal);background:var(--xc-teal-pale);border-radius:var(--xc-radius-sm);font-size:.68rem;font-weight:800;letter-spacing:.04em}.exercise-series-nav-button.active .exercise-series-nav-number{color:var(--xc-white);background:var(--xc-teal)}.exercise-series-nav-title{min-width:0;font-size:.76rem;font-weight:650;line-height:1.35}.exercise-series-nav-count{display:inline-grid;min-width:1.55rem;min-height:1.55rem;padding:0 .35rem;place-items:center;color:var(--xc-slate-500);background:var(--xc-slate-100);border-radius:var(--xc-radius-sm);font-size:.68rem;font-weight:750}.exercise-series-nav-button.active .exercise-series-nav-count{color:var(--xc-teal);background:var(--xc-white)}.exercise-series-nav a{display:inline-flex;align-items:center;gap:.45rem;min-height:2.25rem;padding:.4rem .65rem;color:var(--xc-slate-700);background:var(--xc-white);border:1px solid var(--xc-slate-200);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.75rem;font-weight:600;transition:border-color .2s,color .2s,box-shadow .2s}.exercise-series-nav a:hover,.exercise-series-nav a:focus-visible{color:var(--xc-teal);border-color:var(--xc-teal-2);box-shadow:none}.exercise-series-nav a b{display:inline-grid;place-items:center;min-width:1.35rem;min-height:1.35rem;padding:0 .3rem;color:var(--xc-teal);background:var(--xc-teal-pale);border-radius:var(--xc-radius-sm);font-size:.68rem}.exercise-series-list{display:flex;flex-direction:column;gap:2.75rem}.exercise-series{scroll-margin-top:170px}.exercise-series-heading{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:2px solid var(--xc-ink)}.exercise-series-heading h2{color:var(--xc-slate-800);font-family:var(--xc-font-heading);font-size:1.05rem;line-height:1.35}.exercise-series-heading>span{flex-shrink:0;color:var(--xc-teal);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:700}.exercise-series-heading-copy{min-width:0}.exercise-series-position{margin:0 0 .3rem;color:var(--xc-teal);font-family:var(--xc-font-heading);font-size:.66rem;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.exercise-series-pagination{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:1rem;align-items:center;margin-top:2rem;padding-top:1.25rem;border-top:1px solid var(--xc-slate-200)}.exercise-series-pagination-button{display:inline-flex;gap:.5rem;align-items:center;width:fit-content;min-height:2.55rem;padding:.55rem .85rem;color:var(--xc-teal);background:var(--xc-white);border:1px solid var(--xc-slate-200);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.75rem;font-weight:650;cursor:pointer;transition:border-color .2s,background .2s,box-shadow .2s}.exercise-series-pagination-button.next{justify-self:end}.exercise-series-pagination-button:hover:not(:disabled),.exercise-series-pagination-button:focus-visible:not(:disabled){background:var(--xc-ink-pale);border-color:var(--xc-teal-2);box-shadow:none}.exercise-series-pagination-button:disabled{color:var(--xc-slate-400);background:var(--xc-slate-50);cursor:not-allowed}.exercise-series-pagination-status{color:var(--xc-slate-500);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:700;font-variant-numeric:tabular-nums}.exercises-grid{display:flex;flex-direction:column;gap:1.25rem}.exercise-series-active .exercises-grid{gap:1.5rem}.exercises-empty{text-align:center;padding:3rem 1.25rem;color:var(--xc-slate-400);font-size:.92rem}.exercises-empty-reset{margin-top:.85rem;padding:.5rem .9rem;border:1px solid var(--xc-line);border-radius:var(--xc-radius-sm);background:var(--xc-paper-light);color:var(--xc-ink);font-family:var(--xc-font-heading);font-size:.78rem;font-weight:600;cursor:pointer}.exercises-empty-reset:hover{border-color:var(--xc-ink);background:var(--xc-white)}.exercise-card-v2{position:relative;background:var(--xc-white);border:1px solid var(--xc-slate-200);border-radius:var(--xc-radius-lg);overflow:hidden;box-shadow:none;transition:border-color .2s;content-visibility:auto;contain-intrinsic-size:auto 320px}.exercise-card-v2:hover{box-shadow:none;border-color:var(--xc-ink)}.exercise-card-accent{position:absolute;top:0;left:0;bottom:0;width:4px}.exercise-card-v2.easy .exercise-card-accent{background:var(--xc-green-600)}.exercise-card-v2.medium .exercise-card-accent{background:var(--xc-orange-600)}.exercise-card-v2.hard .exercise-card-accent{background:var(--xc-red-500)}.exercise-card-v2.advanced .exercise-card-accent{background:var(--xc-violet-600)}.exercise-card-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem 1rem 1.75rem;border-bottom:1px solid var(--xc-slate-100)}.exercise-card-title{display:flex;align-items:center;gap:.75rem}.exercise-card-number{font-family:var(--xc-font-heading);font-weight:700;font-size:.92rem;color:var(--xc-slate-800)}.exercise-card-topic{min-width:0;font-family:var(--xc-font-heading);font-size:.86rem;font-weight:500;color:var(--xc-slate-500)}.exercise-metadata{padding:.75rem 1.5rem .75rem 1.75rem;border-bottom:1px solid var(--xc-slate-100);background:var(--xc-slate-50)}.exercise-metadata.cumulative{background:#fff8d8;border-bottom-color:var(--xc-highlight)}.exercise-metadata-main{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem}.exercise-metadata-chip,.exercise-track{display:inline-flex;align-items:center;min-height:1.55rem;padding:.16rem .55rem;border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.68rem;font-weight:650;line-height:1.2}.exercise-metadata-chip{color:var(--xc-slate-600);background:#fff;border:1px solid var(--xc-slate-200)}.exercise-track.immediate{color:var(--xc-ink-dark);background:var(--xc-ink-pale)}.exercise-track.cumulative{color:#76550c;background:#fff2b8}.exercise-prerequisites,.exercise-skills{margin:.5rem 0 0;color:var(--xc-slate-600);font-size:.76rem;line-height:1.45}.exercise-prerequisites strong,.exercise-skills strong{color:var(--xc-slate-700)}.difficulty-pill{font-family:var(--xc-font-heading);padding:.22rem .7rem;border-radius:var(--xc-radius-sm);font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.difficulty-pill.easy{background:#ecfdf5;color:#047857}.difficulty-pill.medium{background:#fffbeb;color:#b45309}.difficulty-pill.hard{background:#fef2f2;color:#dc2626}.difficulty-pill.advanced{background:#f5f3ff;color:#6d28d9}.exercise-card-body{padding:1.25rem 1.5rem 1.25rem 1.75rem}.exercise-statement{line-height:1.85;font-size:.95rem;color:var(--xc-slate-700)}.exercise-statement .katex-display{margin:.8rem 0}.exercise-statement strong,.correction-body strong{font-weight:700;color:var(--xc-slate-900)}.exercise-figure{display:flex;justify-content:center;margin:1.5rem 0 1rem}.exercise-figure-svg{width:420px;height:auto;min-width:300px;max-width:100%;background:var(--xc-slate-50);border-radius:var(--xc-radius-lg);border:1px solid var(--xc-slate-200);padding:16px;box-shadow:none}@media(max-width:768px){.exercise-figure-svg{width:100%;min-width:0;padding:10px}}.exercise-card-footer{border-top:1px solid var(--xc-slate-100)}.correction-btn{display:flex;align-items:center;gap:.6rem;width:100%;padding:.8rem 1.5rem .8rem 1.75rem;background:transparent;border:none;cursor:pointer;font-family:var(--xc-font-heading);font-weight:600;font-size:.82rem;color:var(--xc-correction);transition:all .2s}.correction-btn:hover{background:var(--xc-correction-pale);color:#9e2f2d}.correction-btn.open{color:var(--xc-correction)}.correction-btn-icon{width:1.1rem;height:1.1rem;flex-shrink:0}.correction-chevron{width:1rem;height:1rem;margin-left:auto;transition:transform .3s cubic-bezier(.4,0,.2,1)}.correction-chevron.rotated{transform:rotate(180deg)}.correction-panel{display:grid;grid-template-rows:0fr;transition:grid-template-rows .42s cubic-bezier(.4,0,.2,1)}.correction-panel.open{grid-template-rows:1fr}.correction-panel-inner{min-height:0;overflow:hidden;padding:0 1.5rem 0 1.75rem;transition:padding-bottom .42s cubic-bezier(.4,0,.2,1)}.correction-panel.open .correction-panel-inner{padding-bottom:1.5rem}.correction-label{display:flex;align-items:center;gap:.5rem;margin-bottom:.75rem;padding-bottom:.6rem;border-bottom:2px solid var(--xc-correction);font-family:var(--xc-font-heading);font-weight:700;font-size:.78rem;color:var(--xc-correction);text-transform:uppercase;letter-spacing:.06em}.correction-label svg{width:1rem;height:1rem;stroke:var(--xc-correction)}.correction-body{background:var(--xc-correction-pale);border:1px solid #E8C2BD;border-left:3px solid var(--xc-correction);border-radius:var(--xc-radius);padding:1.25rem 1.5rem;line-height:1.85;font-size:.93rem;color:var(--xc-slate-700)}.correction-body .katex-display{margin:.6rem 0}main[data-level^=maroc-] .exercises-container{max-width:960px}main[data-level^=maroc-] .exercises-stats{margin-bottom:1.25rem;padding-bottom:.9rem}main[data-level^=maroc-] .exercise-series-nav{margin-bottom:1.25rem;padding:1.15rem}main[data-level^=maroc-] .exercises-header{margin-bottom:2rem}main[data-level^=maroc-] .exercise-series-heading{margin-bottom:1.35rem;padding-bottom:.95rem}main[data-level^=maroc-] .exercise-card-header{padding:1.15rem 1.75rem 1.1rem 2rem}main[data-level^=maroc-] .exercise-metadata{padding:.9rem 1.75rem .9rem 2rem}main[data-level^=maroc-] .exercise-prerequisites,main[data-level^=maroc-] .exercise-skills{margin-top:.65rem;line-height:1.55}main[data-level^=maroc-] .exercise-card-body{padding:1.55rem 1.75rem 1.65rem 2rem}main[data-level^=maroc-] .exercise-statement{font-size:.97rem;line-height:1.85}main[data-level^=maroc-] .exercise-statement .math-paragraph{margin-bottom:1rem;line-height:1.82}main[data-level^=maroc-] .exercise-statement .math-list{gap:.65rem;margin:1rem 0 0}main[data-level^=maroc-] .exercise-statement .math-step+.math-step{margin-top:.35rem}main[data-level^=maroc-] .correction-btn{min-height:3rem;padding:.9rem 1.75rem .9rem 2rem}main[data-level^=maroc-] .correction-panel-inner{padding-right:1.75rem;padding-left:2rem}main[data-level^=maroc-] .correction-panel.open .correction-panel-inner{padding-bottom:1.75rem}main[data-level^=maroc-] .correction-label{margin-bottom:1rem;padding-bottom:.75rem}main[data-level^=maroc-] .correction-body{padding:1.5rem 1.6rem;background:var(--xc-correction-pale);font-size:.96rem;line-height:1.8}main[data-level^=maroc-] .correction-body .math-paragraph{margin:0 0 1rem;line-height:1.8}main[data-level^=maroc-] .correction-body .math-heading-3{margin:1.9rem 0 1rem;padding:0 0 .65rem;color:var(--xc-correction);border-bottom:1px solid #E8C2BD;font-size:1rem;line-height:1.4}main[data-level^=maroc-] .correction-body .math-heading-4{margin:1.45rem 0 .8rem;color:#9e2f2d;font-size:.94rem}main[data-level^=maroc-] .correction-body .math-heading-warning{color:#b45309;border-bottom-color:#fed7aa}main[data-level^=maroc-] .correction-body .math-heading-takeaway{color:var(--xc-ink);border-bottom-color:#b8c8e4}main[data-level^=maroc-] .correction-body .math-heading:first-child{margin-top:0}main[data-level^=maroc-] .correction-body .math-list{gap:.65rem;margin:.9rem 0 1.3rem}main[data-level^=maroc-] .correction-body .math-steps{gap:1rem;margin:1rem 0 1.4rem;padding-left:2rem}main[data-level^=maroc-] .correction-body .math-step{margin:0;padding:1rem 1.1rem;background:var(--xc-paper-light);border:1px solid var(--xc-line);border-radius:var(--xc-radius)}main[data-level^=maroc-] .correction-body .math-step::marker{color:var(--xc-correction);font-family:var(--xc-font-heading);font-weight:800}main[data-level^=maroc-] .correction-body .math-step-body>:first-child{margin-top:0}main[data-level^=maroc-] .correction-body .math-step-body>:last-child{margin-bottom:0}main[data-level^=maroc-] .correction-body .math-display-block{margin:1.15rem 0}main[data-level^=maroc-] .correction-body .math-display-block>.katex-display{margin:0}main[data-level^=maroc-] .correction-body .katex-display.math-result{position:relative;display:block;margin:1.35rem 0;padding:2.05rem 1rem 1rem;background:var(--xc-paper-light);border:1px solid #E8C2BD;border-left:4px solid var(--xc-correction);border-radius:var(--xc-radius);box-shadow:none}main[data-level^=maroc-] .correction-body .katex-display.math-result:before{content:"Résultat";position:absolute;top:.5rem;left:.75rem;color:var(--xc-correction);font-family:var(--xc-font-heading);font-size:.64rem;font-weight:800;letter-spacing:.08em;line-height:1;text-transform:uppercase}.inline-code{background:var(--xc-slate-100);border:1px solid var(--xc-slate-200);border-radius:4px;padding:.12rem .4rem;font-family:JetBrains Mono,Fira Code,monospace;font-size:.88em;color:var(--xc-slate-700)}.correction-body .inline-code{background:var(--xc-paper-light);border-color:#e8c2bd}.math-code-block{max-width:100%;margin:.9rem 0;padding:.85rem 1rem;overflow-x:auto;white-space:pre;tab-size:4;background:var(--xc-paper-light, #FFFDF8);border:1px solid var(--xc-line, #D8D2C7);border-left:3px solid var(--xc-ink, #2453A6);border-radius:var(--xc-radius-sm, 4px);color:var(--xc-graphite, #202124);font:500 .86rem/1.55 JetBrains Mono,Fira Code,Cascadia Code,Consolas,monospace}.math-code-block code{padding:0;white-space:inherit;color:inherit;background:none;border:0;font:inherit}.correction-body .math-code-block{border-left-color:var(--xc-correction, #C6403D)}.checkmark{color:var(--xc-correction);font-weight:700}.supervised-assessment{overflow:hidden;background:var(--xc-paper);border:1px solid var(--xc-line);border-radius:var(--xc-radius-lg);box-shadow:none}.supervised-assessment-header{padding:1.5rem 1.75rem;color:var(--xc-white);background:var(--xc-ink);border-bottom:3px solid var(--xc-ink-dark)}.supervised-assessment-kicker{margin:0 0 .35rem;font-family:var(--xc-font-heading);font-size:.72rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;opacity:.85}.supervised-assessment-header h2{margin:0;color:inherit;font-family:var(--xc-font-heading);font-size:clamp(1.35rem,3vw,1.8rem);line-height:1.25}.supervised-assessment-meta{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:1rem}.supervised-assessment-meta span{display:inline-flex;align-items:center;min-height:1.75rem;padding:.2rem .65rem;background:#ffffff21;border:1px solid rgba(255,255,255,.22);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:600}.supervised-assessment-instructions{margin:1.25rem 1.5rem 0;padding:1rem 1.15rem;color:var(--xc-slate-700);background:var(--xc-white);border:1px solid var(--xc-slate-200);border-radius:var(--xc-radius)}.supervised-assessment-instructions h3{margin:0 0 .55rem;color:var(--xc-ink);font-family:var(--xc-font-heading);font-size:.82rem}.supervised-assessment-instructions ul{margin:0;padding-left:1.15rem;font-size:.82rem;line-height:1.65}.supervised-assessment-exercises{display:flex;flex-direction:column;gap:1.25rem;margin:0;padding:1.5rem;list-style:none}.supervised-assessment-exercises>li{min-width:0}.problem-card .exercise-card-body{padding-bottom:1.5rem}.problem-titre{font-family:var(--xc-font-heading);font-size:.9rem;font-weight:500;color:var(--xc-slate-500);font-style:italic}.problem-enonce{margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px dashed var(--xc-slate-200)}.problem-parties{display:flex;flex-direction:column;gap:1rem}.problem-partie{padding:.75rem 0;border-bottom:1px solid var(--xc-slate-100)}.problem-partie:last-child{border-bottom:none}.problem-partie-question{display:flex;gap:.5rem;align-items:flex-start;margin-bottom:.5rem;line-height:1.8;font-size:.93rem;color:var(--xc-slate-700)}.problem-partie-numero{font-family:var(--xc-font-heading);font-weight:700;color:var(--xc-teal);min-width:1.5rem;flex-shrink:0}.partie-correction-btn{font-size:.78rem;padding:.4rem .8rem;margin-bottom:.25rem}.problem-section{margin-bottom:1.25rem}.problem-section:last-child{margin-bottom:0}.problem-section-titre{font-family:var(--xc-font-heading);font-size:.95rem;font-weight:700;color:var(--xc-ink-dark);margin:0 0 .75rem;padding:.5rem .75rem;background:var(--xc-ink-pale);border-left:3px solid var(--xc-ink);border-radius:0 var(--xc-radius-sm) var(--xc-radius-sm) 0}.placeholder{text-align:center;padding:3rem 1.25rem;color:var(--xc-slate-500)}.placeholder h2{font-family:var(--xc-font-heading);font-size:1.5rem;margin-bottom:.5rem;color:var(--xc-slate-800)}.exercises-stats{justify-content:space-between;flex-wrap:wrap}.exercise-progress-summary{color:var(--xc-slate-600);font-family:var(--xc-font-heading);font-size:.76rem}.exercise-progress-summary strong{color:var(--xc-ink)}.exercise-bank-tools{position:relative;z-index:4;display:grid;grid-template-columns:minmax(0,1fr) minmax(190px,.34fr);gap:.8rem;align-items:start;margin:0 0 1.25rem}.exercise-search{position:relative;min-width:0}.exercise-search>label{display:block;margin:0 0 .38rem;color:var(--xc-slate-700);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:700}.exercise-search-field{display:flex;align-items:center;min-height:48px;padding:0 .35rem 0 .85rem;background:var(--xc-white);border:1px solid var(--xc-line);border-radius:var(--xc-radius)}.exercise-search-field:focus-within{border-color:var(--xc-ink);outline:3px solid rgba(36,83,166,.16);outline-offset:1px}.exercise-search-field>svg{width:1.15rem;height:1.15rem;flex:0 0 auto;fill:none;stroke:var(--xc-ink);stroke-width:2;stroke-linecap:round}.exercise-search-field input{min-width:0;flex:1;min-height:46px;padding:.65rem .7rem;color:var(--xc-graphite);background:transparent;border:0;outline:0;font:inherit;font-size:.88rem}.exercise-search-field input::placeholder{color:var(--xc-slate-400)}.exercise-search-clear{display:grid;width:40px;height:40px;flex:0 0 auto;place-items:center;color:var(--xc-slate-600);background:transparent;border:0;border-radius:var(--xc-radius-sm);font-size:1.35rem;line-height:1}.exercise-search-clear:hover,.exercise-search-clear:focus-visible{color:var(--xc-correction);background:var(--xc-correction-pale)}.exercise-search-results{position:absolute;top:calc(100% + .4rem);left:0;right:0;z-index:12;max-height:min(420px,65vh);overflow-y:auto;padding:.55rem;background:var(--xc-paper-light);border:1px solid var(--xc-ink);border-radius:var(--xc-radius);box-shadow:4px 4px 0 var(--xc-line)}.exercise-search-results>p{margin:0;padding:.35rem .45rem .5rem;color:var(--xc-slate-600);font-size:.75rem}.exercise-search-results ul{display:flex;flex-direction:column;gap:.22rem;margin:0;padding:0;list-style:none}.exercise-search-results li button{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:.75rem;align-items:center;width:100%;min-height:50px;padding:.55rem .65rem;color:var(--xc-slate-700);background:transparent;border:1px solid transparent;border-radius:var(--xc-radius-sm);text-align:left}.exercise-search-results li button:hover,.exercise-search-results li button:focus-visible{color:var(--xc-ink-dark);background:var(--xc-ink-pale);border-color:var(--xc-ink)}.exercise-search-results li button:focus-visible{outline:3px solid rgba(36,83,166,.28);outline-offset:2px}.exercise-search-number{color:var(--xc-ink);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:750}.exercise-search-title{min-width:0;font-size:.8rem;font-weight:650;line-height:1.3}.exercise-search-title small{display:block;margin-top:.12rem;overflow:hidden;color:var(--xc-slate-500);font-size:.68rem;font-weight:500;text-overflow:ellipsis;white-space:nowrap}.exercise-search-more{border-top:1px solid var(--xc-line)}.exercise-resume{display:flex;min-height:74px;flex-direction:column;align-items:flex-start;justify-content:center;padding:.72rem .85rem;color:var(--xc-paper-light);background:var(--xc-ink);border:1px solid var(--xc-ink-dark);border-radius:var(--xc-radius);text-align:left}.exercise-resume:hover,.exercise-resume:focus-visible{background:var(--xc-ink-dark);outline:3px solid rgba(36,83,166,.22);outline-offset:2px}.exercise-resume span{font-family:var(--xc-font-heading);font-size:.64rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.exercise-resume strong{margin-top:.16rem;font-family:var(--xc-font-heading);font-size:.86rem}.exercise-resume small{margin-top:.12rem;color:#ffffffd1;font-size:.68rem}.exercise-resume.complete{color:var(--xc-slate-700);background:var(--xc-amber-pale);border-color:var(--xc-highlight)}.exercise-resume.complete small{color:var(--xc-slate-600)}.exercise-series-nav>.exercise-series-mobile{display:none}.exercise-series-nav-copy{display:flex;min-width:0;flex-direction:column;gap:.12rem}.exercise-series-nav-range{color:var(--xc-slate-500);font-size:.66rem;font-weight:500;line-height:1.25}.exercise-series-nav-button.active .exercise-series-nav-range{color:var(--xc-ink-dark)}.exercise-series-heading{scroll-margin-top:150px}.exercise-series-progress{display:flex;min-width:150px;flex-direction:column;gap:.35rem;align-items:flex-end}.exercise-series-progress span{color:var(--xc-slate-600);font-family:var(--xc-font-heading);font-size:.7rem;font-weight:650}.exercise-series-progress progress{width:150px;height:6px;overflow:hidden;border:0;border-radius:1px;color:var(--xc-ink);background:var(--xc-slate-100)}.exercise-series-progress progress::-webkit-progress-bar{background:var(--xc-slate-100)}.exercise-series-progress progress::-webkit-progress-value{background:var(--xc-ink)}.exercise-series-progress progress::-moz-progress-bar{background:var(--xc-ink)}.exercise-card-v2{scroll-margin-top:150px}.exercise-card-v2:focus-visible{border-color:var(--xc-ink);outline:3px solid rgba(36,83,166,.2);outline-offset:3px}.exercise-card-title{display:flex;min-width:0;align-items:baseline;gap:.25rem;margin:0;font-size:inherit;line-height:1.4}.exercise-card-badges{display:flex;flex:0 0 auto;flex-wrap:wrap;gap:.4rem;justify-content:flex-end}.exercise-progress-pill{display:inline-flex;min-height:1.55rem;align-items:center;padding:.22rem .58rem;border:1px solid var(--xc-line);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.64rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em}.exercise-progress-pill.not-started{color:var(--xc-slate-600);background:var(--xc-slate-50)}.exercise-progress-pill.success{color:#047857;background:#ecfdf5;border-color:#a7dcc9}.exercise-progress-pill.review{color:#9e2f2d;background:var(--xc-correction-pale);border-color:#e8c2bd}.exercise-pedagogy-details{margin-top:.55rem}.exercise-pedagogy-details summary{display:flex;min-height:44px;align-items:center;justify-content:space-between;gap:.75rem;padding:.35rem 0;color:var(--xc-ink-dark);cursor:pointer;font-family:var(--xc-font-heading);font-size:.74rem;font-weight:700;list-style:none}.exercise-pedagogy-details summary::-webkit-details-marker{display:none}.exercise-pedagogy-details summary:before{content:"+";display:grid;width:1.35rem;height:1.35rem;flex:0 0 auto;place-items:center;color:var(--xc-ink);border:1px solid var(--xc-ink);border-radius:2px;line-height:1}.exercise-pedagogy-details[open] summary:before{content:"−"}.exercise-pedagogy-details summary span{margin-right:auto}.exercise-pedagogy-details summary small{color:var(--xc-slate-500);font-size:.66rem}.exercise-pedagogy-details summary:focus-visible{outline:3px solid rgba(36,83,166,.2);outline-offset:2px}.exercise-pedagogy-content{padding:.15rem 0 .5rem 2.1rem;border-top:1px dashed var(--xc-line)}.exercise-guided-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem;padding:.8rem 1.5rem .8rem 1.75rem}.exercise-guided-actions>:only-child{grid-column:1 / -1}.exercise-step-button{display:flex;min-height:46px;align-items:center;gap:.55rem;padding:.58rem .72rem;color:var(--xc-slate-700);background:var(--xc-paper-light);border:1px solid var(--xc-line);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.78rem;font-weight:700;text-align:left}.exercise-step-button:hover,.exercise-step-button:focus-visible{border-color:var(--xc-ink);outline:3px solid rgba(36,83,166,.16);outline-offset:1px}.exercise-step-button.hint{color:#735b05;background:var(--xc-amber-pale);border-color:#d7be4c}.exercise-step-button.correction{color:#9e2f2d;background:var(--xc-correction-pale);border-color:#e8c2bd}.exercise-step-button.errors{width:100%;color:#9e2f2d;background:var(--xc-paper-light);border-color:#e8c2bd}.exercise-step-button.open{border-color:currentColor}.exercise-step-button>svg{width:1.05rem;height:1.05rem;margin-left:auto;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.exercise-step-number{display:grid;width:1.35rem;height:1.35rem;flex:0 0 auto;place-items:center;color:inherit;background:#ffffffb8;border:1px solid currentColor;border-radius:2px;font-size:.65rem}.exercise-guided-panel{margin:0 1.5rem .9rem 1.75rem;padding:1rem 1.1rem;color:var(--xc-slate-700);background:var(--xc-paper-light);border:1px solid var(--xc-line);border-left:3px solid var(--xc-highlight);border-radius:var(--xc-radius-sm);font-size:.88rem;line-height:1.7}.exercise-guided-panel[hidden]{display:none}.exercise-guided-panel.errors{border-left-color:var(--xc-correction);background:var(--xc-correction-pale)}.exercise-guided-panel>strong{display:block;margin-bottom:.35rem;color:var(--xc-slate-800);font-family:var(--xc-font-heading);font-size:.76rem}.exercise-errors-step{margin:.85rem 1.5rem 0 1.75rem}.exercise-errors-step .exercise-guided-panel{margin:.55rem 0 0}.exercise-self-evaluation{margin:1rem 1.5rem 1.25rem 1.75rem;padding:.9rem 1rem 1rem;background:var(--xc-slate-50);border:1px solid var(--xc-line);border-radius:var(--xc-radius-sm)}.exercise-self-evaluation legend{padding:0 .35rem;color:var(--xc-ink-dark);font-family:var(--xc-font-heading);font-size:.78rem;font-weight:750}.exercise-self-evaluation p{margin:0 0 .65rem;color:var(--xc-slate-600);font-size:.75rem}.exercise-self-evaluation>div{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.45rem}.exercise-status-button{display:inline-flex;min-height:44px;align-items:center;justify-content:center;gap:.35rem;padding:.5rem;color:var(--xc-slate-700);background:var(--xc-white);border:1px solid var(--xc-line);border-radius:var(--xc-radius-sm);font-family:var(--xc-font-heading);font-size:.72rem;font-weight:700}.exercise-status-button:hover,.exercise-status-button:focus-visible{border-color:currentColor;outline:3px solid rgba(36,83,166,.16);outline-offset:1px}.exercise-status-button[aria-pressed=true].not-started{color:var(--xc-slate-700);background:var(--xc-slate-100)}.exercise-status-button[aria-pressed=true].success{color:#047857;background:#ecfdf5;border-color:#047857}.exercise-status-button[aria-pressed=true].review{color:#9e2f2d;background:var(--xc-correction-pale);border-color:var(--xc-correction)}.exercise-parts-evaluation{padding-top:.25rem}.exercise-figure{display:block}.exercise-figure-art{display:flex;justify-content:center}.exercise-figure figcaption{margin-top:.55rem;color:var(--xc-slate-500);font-size:.72rem;font-style:italic;line-height:1.45;text-align:center}.filter-btn,.exercise-series-nav-button,.exercise-series-pagination-button,.correction-btn{min-height:44px}@media(max-width:640px){.exercise-card-header{padding:.75rem 1rem .75rem 1.25rem}.exercise-card-title{flex-wrap:wrap;gap:.25rem .5rem}.exercise-card-topic{flex-basis:100%}.exercise-metadata{padding:.65rem 1rem .65rem 1.25rem}.exercise-card-body{padding:1rem 1rem 1rem 1.25rem}.correction-btn{padding:.7rem 1rem .7rem 1.25rem}.correction-panel-inner{padding:0 1rem 0 1.25rem}.correction-panel.open .correction-panel-inner{padding-bottom:1rem}.exercises-header{gap:.35rem;padding:.25rem}.filter-btn{padding:.45rem .7rem;font-size:.72rem}.filter-label{display:none}.filter-btn .filter-count{font-size:.72rem}.exercise-notions{padding:.85rem .9rem}.notion-btn{padding:.4rem .6rem;font-size:.73rem}.exercise-series-nav{padding:.8rem}.exercise-series-nav>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.exercise-series-nav>.exercise-series-nav-buttons{grid-template-columns:1fr}.exercise-series-nav-button{min-height:3.15rem;padding:.6rem}.exercise-series-nav a{justify-content:space-between;min-width:0}.exercise-series-heading{align-items:flex-start}.exercise-series-heading h2{font-size:.95rem}.exercise-series-pagination{grid-template-columns:1fr 1fr;gap:.65rem}.exercise-series-pagination-status{grid-column:1 / -1;grid-row:1;justify-self:center}.exercise-series-pagination-button{grid-row:2;font-size:.7rem}.supervised-assessment-header{padding:1.25rem}.supervised-assessment-instructions{margin:1rem .75rem 0;padding:.9rem}.supervised-assessment-exercises{gap:1rem;padding:.75rem}main[data-level^=maroc-] .exercise-series-nav{padding:.9rem}main[data-level^=maroc-] .exercises-header{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.4rem}main[data-level^=maroc-] .filter-btn{justify-content:flex-start;min-width:0}main[data-level^=maroc-] .filter-label{display:inline}main[data-level^=maroc-] .filter-count{margin-left:auto}main[data-level^=maroc-] .exercise-card-header{align-items:flex-start;padding:1rem 1rem .95rem 1.3rem}main[data-level^=maroc-] .exercise-metadata{padding:.8rem 1rem .8rem 1.3rem}main[data-level^=maroc-] .exercise-card-body{padding:1.2rem 1rem 1.3rem 1.3rem}main[data-level^=maroc-] .correction-btn{padding:.85rem 1rem .85rem 1.3rem}main[data-level^=maroc-] .correction-panel-inner{padding-right:1rem;padding-left:1.3rem}main[data-level^=maroc-] .correction-panel.open .correction-panel-inner{padding-bottom:1.2rem}main[data-level^=maroc-] .correction-body{padding:1.15rem 1rem}main[data-level^=maroc-] .correction-body .math-steps{padding-left:1.55rem}main[data-level^=maroc-] .correction-body .math-step{padding:.85rem}main[data-level^=maroc-] .correction-body .katex-display.math-result{margin-right:-.25rem;margin-left:-.25rem;padding-right:.6rem;padding-left:.6rem}.exercise-bank-tools{grid-template-columns:1fr}.exercise-resume{min-height:68px}.exercise-search-results{max-height:58vh}.exercise-series-nav-label,.exercise-series-nav>.exercise-series-nav-buttons{display:none}.exercise-series-nav>.exercise-series-mobile{display:block}.exercise-series-mobile-trigger{position:relative;display:flex;width:100%;min-height:68px;flex-direction:column;align-items:flex-start;justify-content:center;padding:.65rem 3rem .65rem .75rem;color:var(--xc-slate-800);background:var(--xc-white);border:1px solid var(--xc-ink);border-radius:var(--xc-radius-sm);text-align:left}.exercise-series-mobile-trigger:focus-visible{outline:3px solid rgba(36,83,166,.2);outline-offset:2px}.exercise-series-mobile-action{color:var(--xc-ink);font-family:var(--xc-font-heading);font-size:.64rem;font-weight:750;letter-spacing:.07em;text-transform:uppercase}.exercise-series-mobile-trigger strong{margin-top:.15rem;font-family:var(--xc-font-heading);font-size:.8rem;line-height:1.3}.exercise-series-mobile-trigger small{margin-top:.12rem;color:var(--xc-slate-500);font-size:.68rem}.exercise-series-mobile-trigger>svg{position:absolute;top:50%;right:.85rem;width:1.2rem;height:1.2rem;fill:none;stroke:var(--xc-ink);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transform:translateY(-50%);transition:transform .2s}.exercise-series-mobile-trigger>svg.open{transform:translateY(-50%) rotate(180deg)}.exercise-series-mobile-menu{display:grid;grid-template-columns:1fr;gap:.45rem;margin-top:.55rem;padding-top:.55rem;border-top:1px dashed var(--xc-line)}.exercise-series-mobile-menu[hidden]{display:none}.exercise-series-mobile-menu .exercise-series-nav-button{min-height:54px;padding:.55rem .65rem}.exercise-series-heading{flex-direction:column;align-items:stretch}.exercise-series-progress{width:100%;min-width:0;align-items:stretch}.exercise-series-progress progress{width:100%}.exercise-card-header{gap:.65rem}.exercise-card-title{flex-wrap:wrap}.exercise-card-badges{max-width:45%}.exercise-progress-pill,.difficulty-pill{padding-right:.45rem;padding-left:.45rem;font-size:.58rem}.exercise-pedagogy-details summary small{display:none}.exercise-pedagogy-content{padding-left:0}.exercise-guided-actions{grid-template-columns:1fr;padding:.75rem 1rem .75rem 1.3rem}.exercise-guided-panel,.exercise-errors-step,.exercise-self-evaluation{margin-right:1rem;margin-left:1.3rem}.exercise-self-evaluation{padding:.8rem}.exercise-self-evaluation>div{grid-template-columns:1fr}.exercise-status-button{justify-content:flex-start;padding-right:.75rem;padding-left:.75rem}}.correction-body-raw{font-family:var(--xc-font-mono, ui-monospace, monospace);font-size:.9rem;color:var(--xc-slate-500);word-break:break-word}.exercise-card-v2{--xc-sheet-margin: 2.9rem;--xc-sheet-content-start: 3.65rem;isolation:isolate;min-width:0;max-width:100%;background-color:var(--xc-paper-light);border-color:#cec7ba;border-radius:4px;box-shadow:4px 5px #584f4114,0 12px 24px #38312712}.exercise-card-v2:before{content:"";position:absolute;z-index:0;inset:0;pointer-events:none;border-radius:inherit;background-image:linear-gradient(to right,transparent 0,transparent calc(var(--xc-sheet-margin) - 1px),rgba(198,64,61,.32) calc(var(--xc-sheet-margin) - 1px),rgba(198,64,61,.32) var(--xc-sheet-margin),transparent var(--xc-sheet-margin)),repeating-linear-gradient(to bottom,transparent 0,transparent 29px,rgba(36,83,166,.052) 29px,rgba(36,83,166,.052) 30px)}.exercise-card-v2>:not(.exercise-card-accent){position:relative;z-index:1;min-width:0}.exercise-card-v2:hover{border-color:#aaa294;box-shadow:4px 5px #584f411c,0 14px 28px #38312717}.exercise-card-v2:focus-visible{border-color:var(--xc-ink);outline:3px solid var(--xc-ink);outline-offset:4px}.exercise-card-v2 .exercise-card-accent{z-index:2;top:.95rem;bottom:auto;left:.9rem;width:7px;height:25px;border-radius:2px;box-shadow:0 0 0 2px #fffdf8e6}.exercise-card-header{padding-left:var(--xc-sheet-content-start);background:#fffdf8d1;border-bottom-color:#726a5e33}.exercise-card-number{color:var(--xc-ink);font-weight:750;letter-spacing:.01em}.exercise-card-topic{color:var(--xc-slate-600)}.exercise-metadata{padding-left:var(--xc-sheet-content-start);background:#f7f3eae6;border-bottom-color:#726a5e33}.exercise-metadata.cumulative{background:#fff8d8f0}.exercise-card-body{padding-left:var(--xc-sheet-content-start)}.exercise-card-footer{background:#fffdf8b3;border-top:1px dashed rgba(114,106,94,.28)}.exercise-guided-actions,.correction-btn,.correction-panel-inner{padding-left:var(--xc-sheet-content-start)}.exercise-guided-panel,.exercise-errors-step,.exercise-self-evaluation{margin-left:var(--xc-sheet-content-start)}main[data-level^=maroc-] .exercise-card-v2 .exercise-card-header,main[data-level^=maroc-] .exercise-card-v2 .exercise-metadata,main[data-level^=maroc-] .exercise-card-v2 .exercise-card-body,main[data-level^=maroc-] .exercise-card-v2 .exercise-guided-actions,main[data-level^=maroc-] .exercise-card-v2 .correction-btn,main[data-level^=maroc-] .exercise-card-v2 .correction-panel-inner{padding-left:var(--xc-sheet-content-start)}.exercise-card-v2 :where(.exercise-statement,.correction-body,.math-display-block){min-width:0;max-width:100%}.exercise-card-v2 :where(.exercise-statement,.correction-body) .katex-display{max-width:100%;padding:.48rem .6rem;overflow-x:auto;overflow-y:hidden;background:#fffdf8f7;border:1px solid rgba(114,106,94,.18);border-radius:3px;-webkit-overflow-scrolling:touch}.correction-label{padding-bottom:.5rem;color:var(--xc-correction);border-bottom:1px dashed rgba(198,64,61,.46);font-style:italic;letter-spacing:.025em;text-transform:none}.correction-body{color:var(--xc-slate-800);background:#fffaf7fa;border-color:#c6403d47;border-left-width:2px;box-shadow:inset 0 1px #ffffffc7}main[data-level^=maroc-] .exercise-card-v2 .correction-body{color:var(--xc-slate-800);background:#fffaf7fa;border-color:#c6403d47;border-left-width:2px}.exercise-guided-panel,.exercise-self-evaluation,.exercise-step-button,.exercise-status-button{background-color:#fffdf8f7}.exercise-card-v2 :where(button,summary,a):focus-visible{outline:3px solid var(--xc-ink);outline-offset:2px;box-shadow:0 0 0 2px var(--xc-paper-light)}.supervised-assessment{border-color:#cec7ba;box-shadow:4px 5px #584f4112}.supervised-assessment-instructions{border-color:#cec7ba;box-shadow:2px 2px #584f410d}.problem-library{display:grid;gap:2rem}.problem-library-intro{display:flex;align-items:center;gap:.8rem;padding:.9rem 1rem;color:var(--xc-slate-700);background:#f1f5fb;border:1px solid #CDD9EA;border-left:3px solid var(--xc-ink);border-radius:var(--xc-radius)}.problem-library-intro svg{width:1.35rem;height:1.35rem;flex:0 0 auto;color:var(--xc-ink)}.problem-library-intro p{margin:0;font-size:.86rem;line-height:1.55}.problem-library-intro strong{color:var(--xc-slate-900);font-family:var(--xc-font-heading)}.problem-library-group{min-width:0}.problem-library-group-header{display:flex;align-items:flex-end;justify-content:space-between;gap:1rem;margin-bottom:.8rem;padding:0 .15rem .75rem;border-bottom:1px solid var(--xc-line)}.problem-library-eyebrow{display:block;margin-bottom:.2rem;color:var(--xc-teal);font-family:var(--xc-font-heading);font-size:.66rem;font-weight:750;letter-spacing:.09em;text-transform:uppercase}.assessment-group .problem-library-eyebrow{color:var(--xc-ink)}.problem-library-group-header h2{margin:0;color:var(--xc-slate-900);font-family:var(--xc-font-heading);font-size:clamp(1.05rem,2.2vw,1.25rem);line-height:1.3}.problem-library-group-header p{margin:.25rem 0 0;color:var(--xc-slate-500);font-size:.8rem;line-height:1.45}.problem-library-count{flex:0 0 auto;padding:.3rem .65rem;color:var(--xc-green-600);background:var(--xc-green-50);border:1px solid var(--xc-green-100);border-radius:var(--xc-radius-full);font-family:var(--xc-font-heading);font-size:.7rem;font-weight:750;white-space:nowrap}.problem-library-count.assessment{color:var(--xc-ink);background:var(--xc-ink-pale);border-color:#c7d5eb}.problem-disclosure-list{display:grid;gap:.65rem}.problem-disclosure{min-width:0;overflow:hidden;background:var(--xc-white);border:1px solid #CEC7BA;border-radius:var(--xc-radius);box-shadow:2px 3px #584f410d}.problem-disclosure[open]{border-color:#aaa294;box-shadow:3px 4px #584f4112}.problem-disclosure-summary{display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:.85rem;min-height:68px;padding:.8rem .9rem;list-style:none;cursor:pointer;background:#fffdf8f0;transition:background-color .18s ease}.problem-disclosure-summary::-webkit-details-marker{display:none}.problem-disclosure-summary::marker{content:""}.problem-disclosure-summary:hover{background:#f7f3ea}.problem-disclosure[open]>.problem-disclosure-summary{background:#f2ede4}.problem-disclosure-summary:focus-visible{outline:3px solid var(--xc-ink);outline-offset:-3px}.problem-disclosure-index{min-width:6.35rem;padding:.36rem .55rem;color:var(--xc-green-600);background:var(--xc-green-50);border-left:3px solid var(--xc-green-600);border-radius:0 var(--xc-radius-sm) var(--xc-radius-sm) 0;font-family:var(--xc-font-heading);font-size:.72rem;font-weight:800;letter-spacing:.02em;text-transform:uppercase;white-space:nowrap}.problem-disclosure.assessment .problem-disclosure-index{color:var(--xc-white);background:var(--xc-ink);border-left-color:var(--xc-ink-dark)}.problem-disclosure-copy{display:flex;min-width:0;flex-direction:column;gap:.2rem}.problem-disclosure-title{min-width:0;color:var(--xc-slate-900);font-family:var(--xc-font-heading);font-size:.88rem;font-weight:700;line-height:1.35}.problem-disclosure-meta{color:var(--xc-slate-500);font-size:.72rem;font-weight:550;line-height:1.35}.problem-disclosure-tag{padding:.28rem .55rem;border:1px solid currentColor;border-radius:var(--xc-radius-full);font-family:var(--xc-font-heading);font-size:.64rem;font-weight:750;text-transform:uppercase;white-space:nowrap}.problem-disclosure-tag.easy{color:var(--xc-green-600);background:var(--xc-green-50)}.problem-disclosure-tag.medium{color:var(--xc-orange-700);background:#fff7e8}.problem-disclosure-tag.hard{color:var(--xc-red-600);background:#fff1f0}.problem-disclosure-tag.advanced{color:var(--xc-violet-700);background:#f5f0ff}.problem-disclosure-tag.assessment{color:var(--xc-ink);background:var(--xc-ink-pale)}.problem-disclosure-action{display:inline-flex;align-items:center;justify-content:flex-end;gap:.35rem;min-width:4.5rem;color:var(--xc-ink);font-family:var(--xc-font-heading);font-size:.68rem;font-weight:750}.problem-disclosure-action svg{width:1rem;height:1rem;transition:transform .18s ease}.problem-disclosure-close-label,.problem-disclosure[open] .problem-disclosure-open-label{display:none}.problem-disclosure[open] .problem-disclosure-close-label{display:inline}.problem-disclosure[open] .problem-disclosure-action svg{transform:rotate(180deg)}.problem-disclosure-body{border-top:1px solid #CEC7BA}.problem-disclosure-body>.exercise-card-v2,.problem-disclosure-body>.supervised-assessment{margin:0;background:transparent;border:0;border-radius:0;box-shadow:none}.problem-disclosure-body>.exercise-card-v2:hover,.problem-disclosure-body>.supervised-assessment:hover{border-color:transparent;box-shadow:none}.problem-disclosure-body>.exercise-card-v2>.exercise-card-accent,.problem-disclosure-body>.exercise-card-v2>.exercise-card-header,.problem-disclosure-body>.supervised-assessment>.supervised-assessment-header{display:none}@media(prefers-reduced-motion:reduce){.problem-disclosure-summary,.problem-disclosure-action svg{transition:none}}@media(max-width:640px){.problem-library{gap:1.5rem}.problem-library-intro{align-items:flex-start;padding:.8rem}.problem-library-group-header{align-items:flex-start;gap:.65rem}.problem-library-group-header p{font-size:.75rem}.problem-library-count{margin-top:.15rem;padding-right:.5rem;padding-left:.5rem}.problem-disclosure-summary{grid-template-columns:auto minmax(0,1fr) auto;grid-template-rows:auto auto;align-items:center;gap:.35rem .65rem;min-height:76px;padding:.7rem}.problem-disclosure-index{grid-column:1;grid-row:1;min-width:5.25rem;padding:.3rem .4rem;font-size:.63rem}.problem-disclosure-copy{grid-column:2;grid-row:1 / span 2}.problem-disclosure-title{font-size:.8rem}.problem-disclosure-meta{font-size:.66rem}.problem-disclosure-tag{grid-column:1;grid-row:2;justify-self:start;max-width:5.25rem;padding:.22rem .4rem;overflow:hidden;font-size:.56rem;text-overflow:ellipsis}.problem-disclosure-action{grid-column:3;grid-row:1 / span 2;min-width:1.5rem}.problem-disclosure-open-label,.problem-disclosure-close-label{display:none!important}.exercise-card-v2{--xc-sheet-margin: 2.05rem;--xc-sheet-content-start: 2.55rem;box-shadow:2px 3px #584f4114,0 8px 18px #3831270f}.exercise-card-v2 .exercise-card-accent{top:.8rem;left:.58rem;width:6px;height:22px}.exercise-card-header{padding:.8rem .8rem .75rem var(--xc-sheet-content-start)}.exercise-metadata{padding:.65rem .8rem .65rem var(--xc-sheet-content-start)}.exercise-card-body{padding:1rem .8rem 1rem var(--xc-sheet-content-start)}.exercise-guided-actions{padding:.75rem .8rem .75rem var(--xc-sheet-content-start)}.correction-btn,.correction-panel-inner{padding-right:.8rem;padding-left:var(--xc-sheet-content-start)}.exercise-guided-panel,.exercise-errors-step,.exercise-self-evaluation{margin-right:.8rem;margin-left:var(--xc-sheet-content-start)}.correction-body{padding:1rem .8rem}.exercise-card-v2 :where(.exercise-statement,.correction-body) .katex-display{padding-right:.45rem;padding-left:.45rem}}@media print{.problem-library-intro{display:none!important}.problem-library{gap:1rem}.problem-library-group{break-before:page}.problem-library-group:first-of-type{break-before:auto}.problem-disclosure{overflow:visible;border:1px solid #777;box-shadow:none!important;break-inside:auto}.problem-disclosure-summary{min-height:0;background:#fff!important;break-after:avoid}.problem-disclosure-action{display:none!important}.exercise-card-v2{--xc-sheet-margin: 2.35rem;--xc-sheet-content-start: 2.85rem;content-visibility:visible!important;contain:none!important;overflow:visible;color:#111;background:#fff;border:1px solid #777;box-shadow:none!important;print-color-adjust:exact;-webkit-print-color-adjust:exact}.exercise-card-v2:before{background-image:linear-gradient(to right,transparent 0,transparent calc(var(--xc-sheet-margin) - 1px),rgba(160,42,39,.45) calc(var(--xc-sheet-margin) - 1px),rgba(160,42,39,.45) var(--xc-sheet-margin),transparent var(--xc-sheet-margin))}.exercise-card-header,.exercise-metadata,.exercise-card-footer{background:#fff!important}.exercise-card-header,.exercise-metadata{break-after:avoid}.exercise-guided-actions,.exercise-errors-step,.exercise-self-evaluation,.correction-btn,.exercise-step-button{display:none!important}.correction-panel,.correction-panel.open{display:grid!important;grid-template-rows:1fr!important}.correction-panel-inner{min-height:auto;overflow:visible!important;padding-bottom:1rem!important}.correction-body,.correction-body-raw,.exercise-card-v2 :where(.exercise-statement,.correction-body) .katex-display{display:block!important;color:#111!important;background:#fff!important;box-shadow:none!important}.correction-body-raw{white-space:pre-line!important;font-size:9.5pt}.supervised-assessment,.supervised-assessment-instructions{background:#fff!important;box-shadow:none!important}}
