.pmd-document-reader,.pmd-document-reader .site-main{background:#e9eaec}.pmd-reader{--pmd-paper:#fff;--pmd-ink:#14264b;--pmd-body:#243653;--pmd-muted:#687386;--pmd-line:#d7dde3;--pmd-soft:#f5f7f8;--pmd-accent:#078f9d;--pmd-link:#075db6;max-width:1440px;margin:0 auto;padding:20px 22px 72px;color:var(--pmd-body);font-family:var(--theme-font-family,inherit);font-size:16px;line-height:1.62}.pmd-reader *,.pmd-reader *::before,.pmd-reader *::after{box-sizing:border-box}.pmd-reader a{color:var(--pmd-link);text-decoration-thickness:1px;text-underline-offset:3px}.pmd-viewer-frame{min-width:0}.pmd-breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;max-width:1110px;margin:0 auto 12px;color:#5d6570;font-size:13px;line-height:1.4;direction:ltr;text-align:left;text-transform:none}.pmd-breadcrumbs .ct-separator{flex:0 0 auto;width:8px;height:8px;color:#8b939c}.pmd-breadcrumbs a,.pmd-breadcrumbs span{overflow:hidden;color:inherit;text-decoration:none;text-overflow:ellipsis;white-space:nowrap}.pmd-breadcrumbs .last-item{max-width:min(52vw,560px);color:#303944}.pmd-viewer-bar{position:relative;display:flex;justify-content:space-between;align-items:center;max-width:1110px;min-height:56px;margin:0 auto 16px;padding:8px 10px 8px 14px;border:1px solid #d4d9df;border-radius:6px;background:#fff;color:#273244}.pmd-document-state{display:flex;gap:10px;align-items:center;min-width:0}.pmd-document-state svg{flex:0 0 auto;color:#647083}.pmd-document-state>span{display:flex;flex-direction:column;min-width:0;line-height:1.25}.pmd-document-state strong{color:#182235;font-size:14px;font-weight:700}.pmd-document-state small{margin-top:2px;color:#657085;font-size:12px}.pmd-download-link{display:inline-flex;gap:8px;align-items:center;min-height:38px;padding:7px 12px;border:1px solid #b8c1cc;border-radius:4px;color:#14264b!important;font-size:13px;font-weight:700;text-decoration:none!important}.pmd-download-link:hover,.pmd-download-link:focus-visible{border-color:#078f9d;background:#f3fafb}.pmd-shell{display:grid;grid-template-columns:250px minmax(0,840px);gap:20px;justify-content:center;align-items:start}.pmd-sidebar{position:sticky;top:calc(var(--admin-bar,0px) + 82px);max-height:calc(100vh - 100px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}.pmd-toc{--pmd-toc-surface:#f5f5f5;padding:20px 18px;border:1px solid #d2d5d9;border-radius:6px;background:#f5f5f5;color:#222a34}.pmd-toc h2{margin:0 0 14px;color:#1e2731;font-family:var(--theme-font-family,inherit);font-size:15px;font-weight:800;line-height:1.3;text-transform:uppercase}.pmd-toc ol{margin:0;padding:0;list-style:none}.pmd-toc>ol>li+li{margin-top:16px}.pmd-toc a{display:grid;grid-template-columns:32px minmax(0,1fr);gap:4px;padding:4px 0;color:#303945;font-size:13px;line-height:1.42;text-decoration:none}.pmd-toc>ol>li>a{color:#1c2733;font-weight:750}.pmd-toc a>span{color:#737c86;font-variant-numeric:tabular-nums}.pmd-toc a:hover,.pmd-toc a[aria-current="location"]{color:var(--pmd-link)}.pmd-toc-branches{--pmd-toc-indent:18px;--pmd-toc-branch-y:17px;--pmd-toc-overlap:120px;position:relative;display:grid;gap:1px;margin:4px 0 0 12px!important;padding-left:var(--pmd-toc-indent)!important;overflow:hidden}.pmd-toc-branches li{position:relative;min-width:0;overflow:visible}.pmd-toc-branches li::before{content:"";position:absolute;z-index:1;top:calc(-1 * var(--pmd-toc-overlap));left:calc(-1 * var(--pmd-toc-indent));width:var(--pmd-toc-indent);height:calc(var(--pmd-toc-overlap) + var(--pmd-toc-branch-y));border:0;border-bottom:1px solid #c7ccd1;border-left:1px solid #c7ccd1;border-bottom-left-radius:9px;background:none;pointer-events:none}.pmd-toc-branches li::after{display:none}.pmd-toc-branches li:last-child::after{display:none}.pmd-toc-branches a{position:relative;z-index:2}.pmd-reading-column,.pmd-document{min-width:0}.pmd-anchor-alias{position:absolute;inset:0 auto auto 0;width:1px;height:1px;overflow:hidden}.pmd-page{position:relative;width:100%;margin:0;border:1px solid #cfd3d7;border-radius:2px;background:var(--pmd-paper);color:var(--pmd-body);box-shadow:0 2px 8px rgb(24 31 38 / .08)}.pmd-page-inner{min-height:260px;padding:54px 58px 58px}.pmd-document-cover{margin-bottom:44px;padding-bottom:30px;border-bottom:1px solid var(--pmd-line)}.pmd-cover-top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:22px}.pmd-document-brand{display:flex;flex-direction:column;margin:0!important;color:#5e6f8c;font-size:12px;line-height:1.3}.pmd-document-brand strong{color:var(--pmd-ink);font-size:25px;font-weight:800}.pmd-level-mark{display:grid;width:60px;height:48px;place-items:center;border-radius:50%;background:#e9f5f6;color:#536b91;font-size:25px;font-weight:800}.pmd-resource-kind{display:inline-block;margin:0 0 20px!important;padding:6px 10px;border-radius:3px;background:var(--pmd-accent);color:#fff!important;font-size:12px;font-weight:800;line-height:1.2;text-transform:uppercase}.pmd-document-cover h1{max-width:690px;margin:0;color:var(--pmd-ink);font-family:var(--theme-font-family,inherit);font-size:42px;font-weight:800;line-height:1.12;letter-spacing:0}.pmd-document-meta{margin:15px 0 0!important;color:#56657a;font-size:17px;font-weight:650}.pmd-introduction{max-width:690px;margin:24px 0 0!important;color:#34455f;font-size:17px;line-height:1.68}.pmd-context-link{font-weight:650}.pmd-mobile-toc{display:none}.pmd-section+.pmd-section,.pmd-section-continuation{margin-top:42px}.pmd-section>h2{display:flex;gap:14px;align-items:baseline;margin:0 0 22px;padding-bottom:10px;border-bottom:1px solid var(--pmd-line);color:var(--pmd-ink);font-family:var(--theme-font-family,inherit);font-size:27px;font-weight:800;line-height:1.25;letter-spacing:0;scroll-margin-top:92px}.pmd-section>h2::before{width:22px;height:4px;border-radius:2px;background:var(--pmd-accent);content:"";flex:0 0 auto;transform:translateY(-4px)}.pmd-exercise{margin:0 0 26px;overflow:hidden;border:1px solid #c2d9e2;border-radius:8px;background:#fff;color:var(--pmd-body);scroll-margin-top:92px}.pmd-exercise-heading{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;min-height:62px;padding:0 20px;border-bottom:1px solid #d8e4e9;background:#fff}.pmd-exercise-heading h3{display:flex;gap:18px;align-items:center;min-width:0;margin:0;color:var(--pmd-ink);font-family:var(--theme-font-family,inherit);font-size:19px;font-weight:750;line-height:1.3;letter-spacing:0}.pmd-exercise-label{display:flex;align-items:center;flex:0 0 auto;min-height:34px;padding:0 18px 0 0;border-right:1px solid #8db8c5;color:var(--pmd-accent);font-size:20px;font-weight:800;white-space:nowrap}.pmd-exercise-label span{margin-left:5px;font-variant-numeric:tabular-nums}.pmd-exercise-heading-text{min-width:0;overflow-wrap:anywhere}.pmd-answer-link{display:flex;gap:9px;align-items:center;align-self:center;margin-left:14px;padding:5px 0 5px 14px;border-left:1px solid #e3eaed;color:var(--pmd-link)!important;font-size:13px;font-weight:700;text-decoration:none!important;white-space:nowrap}.pmd-answer-link>span[aria-hidden="true"]{display:grid;width:24px;height:24px;place-items:center;border:1px solid #b8cde0;border-radius:50%;color:#075db6;font-size:14px;line-height:1;transition:background .16s ease,border-color .16s ease,transform .16s ease}.pmd-answer-link svg{display:block;width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.pmd-answer-link:hover,.pmd-answer-link:focus-visible{text-decoration:underline!important}.pmd-answer-link:hover>span[aria-hidden="true"],.pmd-answer-link:focus-visible>span[aria-hidden="true"]{border-color:#078f9d;background:#eef8f9;transform:translateX(1px)}.pmd-exercise-body{padding:25px 26px 28px}.pmd-exercise-statement{margin:0 0 17px!important;color:#33445d;font-weight:600}.pmd-question-list{display:grid;gap:20px;margin:0!important;padding:0!important;counter-reset:pmd-question;list-style:none!important}.pmd-question-list>li{display:grid;grid-template-columns:36px minmax(0,1fr);align-items:start;min-width:0;counter-increment:pmd-question}.pmd-question-list>li::before{grid-column:1;color:var(--pmd-accent);content:counter(pmd-question) ".";font-weight:800;font-variant-numeric:tabular-nums}.pmd-question-text{grid-column:2;margin:0!important;min-width:0}.pmd-question-list>li>.pmd-formula-display{grid-column:2;margin-top:5px;padding:2px 0;background:#fff0;text-align:left}.pmd-question-list-single>li,.pmd-question-list-single>li>.pmd-question-text,.pmd-question-list-single>li>.pmd-formula-display{grid-column:1}.pmd-question-list-single>li{grid-template-columns:minmax(0,1fr)}.pmd-question-list-single>li::before{content:none}.pmd-hint{max-width:520px;margin:22px 0 0 36px;padding:9px 12px;border-left:2px solid #84b9c1;background:#f5f8f8;color:#405266;font-size:14px;line-height:1.52}.pmd-hint strong{display:block;margin-bottom:3px;color:#167f89;font-size:12px;text-transform:uppercase}.pmd-hint p{margin:0!important}.pmd-correction{border-color:#d3d8dd}.pmd-correction .pmd-exercise-heading{background:#fafafa}.pmd-correction .pmd-exercise-label{border-right-color:#c7ccd1;color:#465262}.pmd-formula{max-width:100%}.pmd-formula .katex{color:#102a52;font-size:1.19em}.pmd-formula-display .katex{font-size:1.24em}.pmd-formula-display{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;padding:8px 0;background:#fff0;text-align:center;scrollbar-width:thin}.pmd-formula-display>.katex-display{margin:0}.pmd-table{max-width:100%;margin:20px 0 24px;overflow-x:auto;border:1px solid var(--pmd-line);border-radius:6px;scrollbar-width:thin}.pmd-table table{width:100%;min-width:520px;margin:0;border-collapse:collapse;color:var(--pmd-body);font-size:14px}.pmd-table caption{padding:10px 12px;border-bottom:1px solid var(--pmd-line);background:#f4f6f7;color:#425167;font-weight:700;text-align:left}.pmd-table th,.pmd-table td{padding:9px 12px;border-right:1px solid var(--pmd-line);border-bottom:1px solid var(--pmd-line);text-align:left}.pmd-table tr:last-child td{border-bottom:0}.pmd-table th:last-child,.pmd-table td:last-child{border-right:0}.pmd-page figure{margin:22px 0}.pmd-page figure img{display:block;width:100%;max-width:var(--pmd-figure-width,100%);margin-inline:auto;height:auto;aspect-ratio:var(--pmd-figure-ratio,auto);border:1px solid #e0e4e7;border-radius:4px;background:#fff;object-fit:contain}.pmd-page figcaption{margin-top:7px;color:var(--pmd-muted);font-size:12px;line-height:1.45;text-align:center}.pmd-page-gap{display:flex;min-height:26px;align-items:center;justify-content:center}.pmd-ad-boundary{width:100%}.pmd-ad-boundary:empty{display:none}.pmd-ad-boundary:not(:empty){margin:16px 0;padding:14px 0;border-top:1px solid #cfd2d5;border-bottom:1px solid #cfd2d5}.pmd-download-panel{display:flex;gap:28px;justify-content:space-between;align-items:center;margin-top:22px;padding:24px 26px;border:1px solid #ced3d8;border-radius:6px;background:#f7f7f7;color:#24303c}.pmd-download-panel p{margin:4px 0 0!important}.pmd-download-panel h2{margin:0;color:#1d2732;font-family:var(--theme-font-family,inherit);font-size:22px;letter-spacing:0}.pmd-download-eyebrow{color:#6e7780;font-size:11px;font-weight:800;text-transform:uppercase}.pmd-download-late{display:flex;flex:0 0 auto;flex-direction:column;padding:10px 14px;border-radius:4px;background:#25282b;color:#fff!important;font-size:14px;font-weight:750;line-height:1.3;text-decoration:none!important}.pmd-download-late span{color:#bec4ca;font-size:11px;font-weight:500}.pmd-unavailable{max-width:760px;margin:40px auto;padding:32px;background:#fff;color:#222}@media (max-width:980px){.pmd-reader{padding-right:14px;padding-left:14px}.pmd-shell{display:block;max-width:840px;margin:0 auto}.pmd-sidebar{display:none}.pmd-mobile-toc{--pmd-toc-surface:var(--pmd-paper);display:block;margin:0 0 34px;border-top:1px solid var(--pmd-line);border-bottom:1px solid var(--pmd-line)}.pmd-mobile-toc summary{padding:12px 0;color:var(--pmd-ink);cursor:pointer;font-weight:800}.pmd-mobile-toc>ol{margin:0;padding:4px 0 16px}.pmd-mobile-toc ol{margin:0;padding-left:0;color:#45546a;list-style:none}.pmd-mobile-toc li{margin:6px 0}.pmd-mobile-toc a{color:#303945;text-decoration:none}.pmd-mobile-toc a:hover,.pmd-mobile-toc a:focus-visible,.pmd-mobile-toc a[aria-current="location"]{color:var(--pmd-link)}.pmd-mobile-toc a>span{display:inline-block;min-width:34px;color:#718095;font-variant-numeric:tabular-nums}.pmd-mobile-toc .pmd-toc-branches{--pmd-toc-indent:18px;margin-left:16px!important;padding-left:var(--pmd-toc-indent)!important}}@media (max-width:640px){.pmd-document-reader,.pmd-document-reader .site-main{background:#dfe1e3}.pmd-reader{padding:10px 0 48px;font-size:15px;line-height:1.58}.pmd-breadcrumbs{margin:0 12px 9px;font-size:12px}.pmd-breadcrumbs .last-item{max-width:62vw}.pmd-viewer-bar{min-height:50px;margin:0 8px 10px;border-radius:5px}.pmd-document-state small{display:none}.pmd-download-link{min-height:34px;padding:5px 9px;font-size:12px}.pmd-page{width:calc(100% - 16px);margin-right:auto;margin-left:auto;border-radius:2px}.pmd-page-inner{min-height:0;padding:28px 18px 32px}.pmd-document-cover{margin-bottom:30px;padding-bottom:24px}.pmd-cover-top{justify-content:flex-end;margin-bottom:18px}.pmd-document-brand{display:none}.pmd-level-mark{width:48px;height:40px;font-size:20px}.pmd-resource-kind{margin-bottom:16px!important;font-size:11px}.pmd-document-cover h1{font-size:30px;line-height:1.16}.pmd-document-meta,.pmd-introduction{font-size:15px}.pmd-introduction{margin-top:19px!important}.pmd-section+.pmd-section,.pmd-section-continuation{margin-top:32px}.pmd-section>h2{margin-bottom:18px;font-size:22px;scroll-margin-top:74px}.pmd-exercise{margin-bottom:18px;border-radius:7px}.pmd-exercise-heading{grid-template-columns:minmax(0,1fr) auto;min-height:54px;padding:0 12px}.pmd-exercise-heading h3{gap:10px;font-size:15px}.pmd-exercise-label{min-height:28px;padding:0 10px 0 0;font-size:14px}.pmd-exercise-heading-text{line-height:1.3}.pmd-answer-link{margin-left:8px;padding-left:9px;font-size:11px}.pmd-answer-link>span[aria-hidden="true"]{width:26px;height:26px;font-size:13px}.pmd-answer-link-label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}.pmd-exercise-body{padding:20px 15px 22px}.pmd-question-list{gap:13px}.pmd-question-list>li{grid-template-columns:30px minmax(0,1fr)}.pmd-question-list-single>li{grid-template-columns:minmax(0,1fr)}.pmd-hint{margin-left:30px}.pmd-formula .katex{font-size:1.14em}.pmd-formula-display .katex{font-size:1.18em}.pmd-formula-display{margin-right:-4px;margin-left:-4px;padding:7px 4px}.pmd-page-gap{min-height:18px}.pmd-download-panel{display:block;margin:10px 8px 0;padding:20px}.pmd-download-panel h2{font-size:20px}.pmd-download-late{margin-top:16px}}@media (prefers-color-scheme:dark){.pmd-document-reader,.pmd-document-reader .site-main{background:#171717}.pmd-reader{--pmd-paper:#fff}.pmd-breadcrumbs{color:#aeb3b8}.pmd-breadcrumbs .last-item{color:#e3e5e7}.pmd-toc{--pmd-toc-surface:#202122;border-color:#3b3d40;background:#202122;color:#d5d8db}.pmd-toc h2,.pmd-toc>ol>li>a{color:#f0f1f2}.pmd-toc a{color:#c5c9cd}.pmd-toc a>span{color:#8f969d}.pmd-toc-branches::before,.pmd-toc-branches li::before{border-color:#55595d}.pmd-page{border-color:#494b4e}.pmd-page-gap{background:#171717}.pmd-download-panel{border-color:#43464a;background:#222324;color:#d6d9dc}.pmd-download-panel h2{color:#f2f3f4}.pmd-download-eyebrow{color:#a2a8ae}}@media print{.pmd-document-reader,.pmd-document-reader .site-main,.pmd-reader{background:#fff!important}.pmd-reader{max-width:none;padding:0}.pmd-breadcrumbs,.pmd-viewer-bar,.pmd-sidebar,.pmd-mobile-toc,.pmd-page-gap,.pmd-download-panel{display:none!important}.pmd-shell{display:block}.pmd-page{break-after:page;border:0}.pmd-page:last-child{break-after:auto}.pmd-page-inner{padding:12mm}.pmd-exercise{break-inside:avoid}}