@import "https://fonts.googleapis.com/css2?family=Fraunces:wght@600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap";.course-shell{--page:#faf8f3;--surface:#fff;--ink:#1c1a17;--ink-muted:#5b564d;--border:#e7e2d8;--faint:#f1ede4;--accent:#4f46e5;--accent-ink:#3730a3;--accent-soft:#eef0ff;--accent-line:#c7cbff;--on-accent:#fff;--without-bg:#fff1f0;--without-border:#f5c2bd;--without-ink:#9a2b22;--with-bg:#ecfdf3;--with-border:#a7e3c0;--with-ink:#13703e;--hood-bg:#f3f1ff;--hood-border:#d4d0fb;--hood-ink:#3730a3;--mist-bg:#fff8e6;--mist-border:#f1d68b;--mist-ink:#7a5300;--shadow:0 1px 2px #0000000a, 0 8px 24px #0000000a;--lift:0 2px 4px #0000000d, 0 14px 32px #00000014;--code-bg:#f7f6f2;--code-bar:#efede6;--code-ink:#1c1a17;--code-muted:#6b665c;--tok-kw:#5b3fd6;--tok-str:#0f7b3f;--tok-num:#b4530e;--tok-com:#6b665c;--out-bg:#efede6;--topbar-h:56px;--wrap:72rem;--gutter:20px;--serif:Fraunces, Georgia, "Times New Roman", serif;--sans:Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;background:var(--page);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;min-height:100vh;font-size:16px;line-height:1.6}@media (prefers-color-scheme:dark){.course-shell{--page:#14130f;--surface:#1d1c18;--ink:#ece8df;--ink-muted:#a8a297;--border:#2f2d27;--faint:#25231e;--accent:#8b85ff;--accent-ink:#c9c5ff;--accent-soft:#25233f;--accent-line:#4a4680;--on-accent:#14130f;--without-bg:#2a1715;--without-border:#5c2e29;--without-ink:#f4a9a0;--with-bg:#10261b;--with-border:#245c3f;--with-ink:#7fd9a4;--hood-bg:#1e1b33;--hood-border:#3d3870;--hood-ink:#c9c5ff;--mist-bg:#2a220e;--mist-border:#5e4a1c;--mist-ink:#f0cd7a;--shadow:0 1px 2px #0000004d, 0 8px 24px #0003;--lift:0 2px 4px #0000004d, 0 14px 32px #00000059;--code-bg:#1d1c18;--code-bar:#26241e;--code-ink:#ece8df;--code-muted:#a39d90;--tok-kw:#b8aefc;--tok-str:#9fdcae;--tok-num:#f4b98a;--tok-com:#a39d90;--out-bg:#26241e}}.course-shell a{color:var(--accent)}.course-shell :focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}.course-topbar{z-index:50;height:var(--topbar-h);padding:0 max(var(--gutter), calc((100% - var(--wrap)) / 2 + var(--gutter)));background:var(--page);border-bottom:1px solid var(--border);align-items:center;gap:20px;display:flex;position:sticky;top:0}.course-topbar a{color:var(--ink-muted);font-size:14px;font-weight:500;text-decoration:none}.course-topbar a:hover{color:var(--ink)}.course-topbar .course-home{font-family:var(--serif);color:var(--ink);margin-right:auto;font-size:18px;font-weight:600}.course-frame{max-width:var(--wrap);padding:0 var(--gutter);margin:0 auto;display:block}@media (width>=640px){.course-shell{--gutter:24px}}.course-main{min-width:0}.course-side{top:var(--topbar-h);z-index:40;background:var(--page);position:sticky}.course-side-bar{justify-content:space-between;align-items:center;gap:12px;padding:10px 0;display:flex}.course-contents-btn{font:600 14px var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--border);cursor:pointer;border-radius:10px;padding:8px 14px}.course-side-mini{color:var(--ink-muted);font-size:13px}.course-side-panel{padding-bottom:24px}.course-side-head{padding:22px 20px 16px;position:relative}.course-side-title{font-family:var(--serif);color:var(--ink);margin:0 28px 14px 0;font-size:19px;font-weight:600;line-height:1.25}.course-side-count{color:var(--ink-muted);margin:8px 0 0;font-size:13px}.course-side-close,.course-scrim{display:none}.course-side-nav{padding:0 10px}.course-side-module summary{color:var(--ink);cursor:pointer;border-radius:10px;align-items:center;gap:10px;padding:10px;font-size:14px;font-weight:600;list-style:none;display:flex}.course-side-module summary::-webkit-details-marker{display:none}.course-side-module summary:hover{background:var(--faint)}.course-mod-num{background:var(--accent-soft);width:24px;height:24px;color:var(--accent-ink);border-radius:7px;flex:none;place-items:center;font-size:12px;font-weight:600;display:inline-grid}.course-side-module ul{margin:0 0 8px;padding:0;list-style:none}.course-side-module li a{min-height:32px;font:500 13.5px/1.4 var(--sans);color:var(--ink-muted);border-radius:8px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:4px;margin:2px 0;padding:6px 10px 6px 36px;text-decoration:none;display:grid}.course-side-module li a:hover{background:var(--faint);color:var(--ink)}.course-side-ltitle{white-space:nowrap;text-overflow:ellipsis;min-width:0;margin-block:-.2em;padding-block:.2em;overflow:hidden}.course-side-module li a.is-draft{color:var(--ink-muted)}.course-side-module li a.is-current,.course-side-module li a.is-current:hover{background:var(--accent-soft);color:var(--accent-ink)}.course-tick{color:var(--ink-muted);font-size:13px}.course-bar{background:var(--border);border-radius:999px;height:6px;overflow:hidden}.course-bar>span{background:var(--accent);border-radius:999px;height:100%;display:block}@media (width>=900px){.course-frame{grid-template-columns:300px minmax(0,1fr);align-items:start;display:grid}.course-side{top:var(--topbar-h);height:calc(100vh - var(--topbar-h));background:var(--page);z-index:auto;scrollbar-width:none;border-bottom:0;overflow-y:auto;-webkit-mask-image:linear-gradient(#0000 0,#000 28px calc(100% - 28px),#0000 100%);mask-image:linear-gradient(#0000 0,#000 28px calc(100% - 28px),#0000 100%)}.course-side-bar{display:none}.course-side-head{padding-top:26px}}@media (width<=899px){.course-side.is-open{z-index:90;border:0;height:auto;position:fixed;inset:0}.course-side-panel{background:var(--page);visibility:hidden;width:min(88vw,320px);transition:transform .2s,visibility .2s;position:absolute;top:0;bottom:0;left:0;overflow-y:auto;transform:translate(-104%)}.course-side.is-open .course-side-panel{visibility:visible;transform:none}.course-side-close{border:1px solid var(--border);background:var(--page);width:32px;height:32px;color:var(--ink);cursor:pointer;border-radius:8px;place-items:center;display:inline-grid;position:absolute;top:14px;right:14px}.course-scrim{cursor:pointer;background:#14130f73;border:0;width:100%;display:block;position:absolute;inset:0}}.course-lesson{overflow-wrap:break-word;min-width:0;max-width:760px;color:var(--ink);margin:0 auto;padding:48px 0 120px;font-size:17.5px;line-height:1.7}.course-lesson p{margin:0}.course-pill{background:var(--accent-soft);color:var(--accent);letter-spacing:.08em;text-transform:uppercase;border-radius:999px;margin:0;padding:6px 12px;font-size:12px;font-weight:600;line-height:1.2;display:inline-block}.course-num{color:var(--accent);font-size:15px;font-weight:600;margin:22px 0 0!important}.course-title{font-family:var(--serif);letter-spacing:-.01em;color:var(--ink);margin:6px 0 0;font-size:44px;font-weight:600;line-height:1.1}.course-lead{color:var(--ink-muted);font-size:21px;line-height:1.5;margin:18px 0 0!important}.course-meta{color:var(--ink-muted);flex-wrap:wrap;gap:10px;margin-top:20px;font-size:14px;display:flex}.course-progress{background:var(--border);border-radius:999px;height:4px;margin-top:14px;overflow:hidden}.course-progress>span{background:var(--accent);border-radius:999px;height:100%;display:block}.course-draft{border:1px dashed var(--border);color:var(--ink-muted);border-radius:12px;padding:16px 20px;margin-top:28px!important}.course-section{background:var(--surface);border:1px solid var(--border);min-width:0;max-width:100%;box-shadow:var(--shadow);border-radius:16px;margin-top:32px;padding:28px}.course-sec-head{align-items:flex-start;gap:14px;margin-bottom:20px;display:flex}.course-sec-num{background:var(--accent);width:28px;height:28px;color:var(--on-accent);border-radius:50%;flex:none;place-items:center;font-size:13px;font-weight:600;display:inline-grid}.course-sec-label{letter-spacing:.08em;text-transform:uppercase;color:var(--ink-muted);font-size:13px;font-weight:600;line-height:1.3;margin:3px 0 0!important}.course-sec-title{font-family:var(--serif);color:var(--ink);margin:2px 0 0;font-size:24px;font-weight:600;line-height:1.25}.course-pair{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;display:grid}.course-box{border:1px solid var(--border);background:var(--surface);border-radius:12px;min-width:0;padding:18px 20px}.course-box.is-without{background:var(--without-bg);border-color:var(--without-border)}.course-box.is-with{background:var(--with-bg);border-color:var(--with-border)}.course-box-label{letter-spacing:.06em;text-transform:uppercase;align-items:center;gap:8px;font-size:13px;font-weight:600;display:flex;margin:0 0 8px!important}.course-box.is-without .course-box-label{color:var(--without-ink)}.course-box.is-with .course-box-label,.course-box-label.is-use{color:var(--with-ink)}.course-box-label.is-skip{color:var(--without-ink)}.course-check-list{margin:0;padding:0;list-style:none}.course-check-list li{padding-left:24px;font-size:16px;line-height:1.6;position:relative}.course-check-list li+li{margin-top:8px}.course-check-list.is-use li:before{content:"✓";color:var(--with-ink);font-weight:700;position:absolute;left:0}.course-check-list.is-skip li:before{content:"✕";color:var(--without-ink);font-weight:700;position:absolute;left:0}.course-steps{min-width:0;margin:0;padding:0;list-style:none}.course-step{border-top:1px solid var(--border);padding:22px 0}.course-step:first-child{border-top:0;padding-top:0}.course-step:last-child{padding-bottom:0}.course-step-label{color:var(--ink-muted);font-size:13px;margin:0!important}.course-step-title{font:600 18px/1.4 var(--sans);color:var(--ink);margin:4px 0 0}.course-step-detail{color:var(--ink);font-size:17.5px;line-height:1.65;margin:6px 0 0!important}.course-flow{flex-wrap:wrap;align-items:center;gap:10px;margin-top:26px;display:flex}.course-flow-item{align-items:center;gap:10px;display:inline-flex}.course-flow-box{overflow-wrap:anywhere;border:1px solid var(--accent-line);background:var(--accent-soft);max-width:100%;color:var(--accent-ink);border-radius:999px;padding:8px 16px;font-size:15px;font-weight:500}.course-flow-arrow{color:var(--ink-muted);font-size:18px}.course-section.is-bare{box-shadow:none;background:0 0;border:0;margin-top:32px;padding:0}.course-row{border:1px solid var(--border);background:var(--surface);border-radius:12px;align-items:center;gap:12px;padding:12px 14px;display:flex}.course-row-icon{color:var(--ink-muted);flex:none}.course-row-text{color:var(--ink);flex:1;font-size:16px}.course-button.is-small{box-shadow:none;border-radius:9px;padding:7px 12px;font-size:14px}.course-button{border:1px solid var(--accent);background:var(--accent);color:var(--on-accent);font:600 16px/1.2 var(--sans);cursor:pointer;border-radius:12px;align-items:center;gap:8px;padding:12px 20px;text-decoration:none;transition:transform .15s,box-shadow .15s,background-color .15s;display:inline-flex;box-shadow:0 1px 2px #00000014}.course-button:hover{box-shadow:var(--lift);color:var(--on-accent);transform:translateY(-1px)}.course-button.is-secondary{background:var(--surface);color:var(--ink);border-color:var(--border);box-shadow:none}.course-button.is-secondary:hover{color:var(--ink)}.course-shell a.course-button{color:var(--on-accent)}.course-shell a.course-button.is-secondary{color:var(--ink)}.course-code{border:1px solid var(--border);background:var(--code-bg);min-width:0;max-width:100%;color:var(--code-ink);border-radius:12px;overflow:hidden}.course-code-bar{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:8px 16px 8px 24px;display:flex}.course-code-label{font:500 13px var(--sans);color:var(--code-muted)}.course-copy{border:1px solid var(--border);color:var(--code-ink);font:500 13px var(--sans);cursor:pointer;background:0 0;border-radius:7px;margin-left:auto;padding:3px 10px}.course-copy:hover{background:var(--faint)}.course-code-pre{max-width:100%;font:15px/1.75 var(--mono);color:var(--code-ink);margin:0;padding:20px 24px;overflow-x:auto}.course-code-pre code{font:inherit;counter-reset:line}.course-code-line{counter-increment:line;white-space:pre;display:block}.course-code-line:before{content:counter(line);text-align:right;width:2em;color:var(--code-muted);-webkit-user-select:none;user-select:none;margin-right:1.2em;font-size:12px;display:inline-block}.course-code .tok-kw{color:var(--tok-kw)}.course-code .tok-str{color:var(--tok-str)}.course-code .tok-num{color:var(--tok-num)}.course-code .tok-com{color:var(--tok-com)}.course-output{min-width:0;max-width:100%;margin-top:14px}.course-output-label{color:var(--ink-muted);font-size:13px;margin:0 0 6px!important}.course-output-pre{background:var(--out-bg);max-width:100%;color:var(--ink);font:15px/1.75 var(--mono);white-space:pre-wrap;border-radius:12px;margin:0;padding:16px 24px;overflow-x:auto}.course-hood-p{margin:0 0 14px!important}.course-example{border:1px solid var(--hood-border);background:var(--surface);border-radius:12px;margin:18px 0 0;overflow:hidden}.course-example>div{grid-template-columns:minmax(0,1fr);gap:4px;padding:12px 16px;display:grid}.course-example>div+div{border-top:1px solid var(--hood-border)}.course-example dt{color:var(--ink-muted);font-size:14px;font-weight:600}.course-example dd{margin:0}.course-example code{font:14.5px var(--mono);color:var(--ink);overflow-wrap:anywhere}.course-mistakes{border:1px solid var(--mist-border);background:var(--mist-bg);color:var(--ink);border-radius:12px;margin:0;padding:18px 20px;list-style:none}.course-mistakes li{padding-left:30px;position:relative}.course-mistakes li+li{margin-top:10px}.course-mistakes li:before{content:"⚠";color:var(--mist-ink);position:absolute;left:0}.course-words{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:0;display:grid}.course-word{border:1px solid var(--border);background:var(--page);border-radius:12px;padding:14px 16px}.course-word dt{color:var(--ink);font-size:16px;font-weight:600}.course-word dd{color:var(--ink-muted);margin:4px 0 0;font-size:15.5px;line-height:1.55}.course-pager{grid-template-columns:1fr 1fr;gap:16px;margin-top:48px;display:grid}.course-pager>span{display:block}.course-pager-link{border:1px solid var(--border);background:var(--surface);min-height:96px;box-shadow:var(--shadow);color:var(--ink);border-radius:16px;flex-direction:column;gap:8px;padding:22px 24px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:flex}.course-pager-link.is-next{text-align:right;align-items:flex-end}.course-pager-link:hover{box-shadow:var(--lift);transform:translateY(-2px)}.course-pager-dir{letter-spacing:.06em;text-transform:uppercase;color:var(--ink-muted);font-size:13px;font-weight:600}.course-pager-title{font-family:var(--serif);color:var(--ink);font-size:20px;font-weight:600;line-height:1.3}.course-modal{border:1px solid var(--border);background:var(--surface);width:min(760px,100vw - 48px);max-width:none;max-height:calc(100vh - 48px);color:var(--ink);border-radius:14px;margin:auto;padding:0;overflow:hidden;box-shadow:0 30px 80px #0000004d}.course-modal::backdrop{background:#14130f80}.course-modal-inner{flex-direction:column;min-width:0;max-height:calc(100vh - 48px);display:flex}.course-modal-head{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:10px 12px 10px 24px;display:flex}.course-modal-title{font:600 15px var(--sans);color:var(--ink)}.course-modal-x{border:1px solid var(--border);width:30px;height:30px;color:var(--ink);cursor:pointer;background:0 0;border-radius:8px;place-items:center;font-size:13px;display:inline-grid}.course-modal-body{min-width:0;max-width:100%;padding:20px 24px 28px;font-size:16px;line-height:1.65;overflow:auto}.course-modal-h{font:600 18px/1.4 var(--sans);color:var(--ink);margin:28px 0 10px!important}.course-modal-gap{height:20px}@media (width<=640px){.course-modal{border:0;border-radius:0;width:100vw;max-width:100vw;height:100%;max-height:none;margin:0}.course-modal[open]{flex-direction:column;display:flex}.course-modal-inner{height:100%;max-height:none}.course-modal-body{flex:1;padding:18px 16px 32px}.course-modal-head{padding:12px 14px 12px 18px}}.course-muted{color:var(--ink-muted)}.course-index{isolation:isolate;max-width:1040px;margin:0 auto;padding:0 0 110px;position:relative}.course-hero{padding:64px 0 52px;position:relative}.course-hero:before{content:"";pointer-events:none;z-index:-1;background:radial-gradient(closest-side,#4f46e517,#0000);height:420px;position:absolute;top:-40px;left:0;right:0}.course-hero-title{max-width:16ch;font-family:var(--serif);letter-spacing:-.02em;color:var(--ink);margin:0;font-size:56px;font-weight:600;line-height:1.04}.course-hero-sub{max-width:62ch;color:var(--ink-muted);margin:22px 0 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0;font-size:24px;font-weight:600;line-height:1.25;position:relative}.course-mod-summary{color:var(--ink-muted);font-size:16px;line-height:1.6;position:relative;margin:10px 0 0!important}.course-mod-list{border-top:1px solid var(--border);margin:18px 0 0;padding:0;list-style:none;position:relative}.course-mod-list li{border-bottom:1px solid var(--border)}.course-mod-list a{color:var(--ink);border-radius:8px;flex-wrap:wrap;align-items:baseline;gap:4px 12px;margin:0 -6px;padding:10px 6px;font-size:15.5px;line-height:1.4;text-decoration:none;display:flex}.course-mod-list 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0}.course-hero-title{font-size:36px}.course-hero-sub{font-size:17px}.course-mod{padding:22px 20px 20px}.course-mod-big{font-size:84px}.course-code-pre{font-size:13.5px}.course-modal-title{font-size:20px}}@media (width>=600px){.course-example>div{grid-template-columns:220px 1fr;align-items:baseline;gap:16px}}@media (prefers-reduced-motion:reduce){.course-shell *,.course-shell :before,.course-shell :after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.viz{--viz-2:#b7791f;--viz-3:#2a9d8f;--viz-4:#8a8476;box-sizing:border-box;border:1px solid var(--border);background:var(--surface);min-width:0;color:var(--ink);border-radius:12px;margin:18px 0 0;padding:20px}@media (prefers-color-scheme:dark){.viz{--viz-2:#e3a857;--viz-3:#5cc2b2;--viz-4:#a8a297}}.viz-caption{font:400 14px/1.5 var(--sans);color:var(--ink-muted);margin:16px 0 0!important}.viz-bars{flex-direction:column;gap:14px;display:flex}.viz-bar-label{font:500 14px/1.4 var(--sans);color:var(--ink);display:block}.viz-bar-line{align-items:center;gap:10px;margin-top:6px;display:flex}.viz-bar-fill{background:var(--accent-line);border-radius:6px;flex:none;min-width:3px;height:18px;display:block}.viz-bar.is-hi .viz-bar-fill{background:var(--accent)}.viz-bar-value{font:500 14px/1 var(--sans);font-variant-numeric:tabular-nums;color:var(--ink-muted);white-space:nowrap}.viz-bar.is-hi .viz-bar-value{color:var(--accent-ink)}.viz-svg{width:100%;max-width:480px;height:auto;display:block;overflow:visible}.viz-axis{stroke:var(--border);stroke-width:1px}.viz-grid{stroke:var(--border);stroke-width:1px;stroke-dasharray:2 3}.viz-tick{font:400 11px var(--sans);fill:var(--ink-muted)}.viz-label{font:500 11px var(--sans);fill:var(--ink)}.viz-label.is-hi{fill:var(--accent-ink);font-weight:600}.viz-dot.is-plain{fill:var(--ink-muted)}.viz-dot.is-hi{fill:var(--accent)}.viz-dot.is-g1{fill:var(--viz-2)}.viz-dot.is-g2{fill:var(--viz-3)}.viz-dot.is-g3{fill:var(--viz-4)}.viz-link{stroke:var(--accent);stroke-width:1.2px;stroke-dasharray:3 3}.viz-line{fill:none;stroke-width:2px;stroke-linejoin:round;stroke-linecap:round}.viz-legend{font:400 14px/1.4 var(--sans);color:var(--ink-muted);flex-wrap:wrap;gap:6px 16px;margin:0 0 12px;padding:0;list-style:none;display:flex}.viz-swatch{vertical-align:0;border-radius:50%;width:10px;height:10px;margin-right:6px;display:inline-block}.viz-swatch.is-g1{background:var(--viz-2)}.viz-swatch.is-g2{background:var(--viz-3)}.viz-swatch.is-g3{background:var(--viz-4)}.viz-table-wrap{min-width:0;max-width:100%;overflow-x:auto}.viz-table{border-collapse:collapse;width:100%;font:400 14px/1.45 var(--sans);font-variant-numeric:tabular-nums}.viz-table th,.viz-table td{text-align:left;vertical-align:top;white-space:normal;overflow-wrap:break-word;border-bottom:1px solid var(--border);padding:9px 10px}.viz-table td{min-width:5.5em}.viz-table code{overflow-wrap:anywhere}.viz-table th{color:var(--ink-muted);font-weight:600}.viz-table td{color:var(--ink)}.viz-table tr.is-hi td{background:var(--accent-soft);color:var(--accent-ink)}.viz-flow{flex-wrap:wrap;gap:10px 8px;margin:0;padding:0;list-style:none;display:flex}.viz-flow-item{align-items:center;gap:8px;display:inline-flex}.viz-flow-box{overflow-wrap:anywhere;border:1px solid var(--accent-line);background:var(--accent-soft);max-width:100%;color:var(--accent-ink);font:500 14px/1.3 var(--sans);border-radius:999px;padding:7px 14px}.viz-flow-arrow{color:var(--ink-muted);font-size:16px}.viz-chips{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.viz-chip{border:1px solid var(--border);background:var(--faint);max-width:100%;font:400 14px/1.35 var(--sans);color:var(--ink);border-radius:10px;flex-direction:column;padding:7px 12px;display:inline-flex}.viz-chip.is-hi{border-color:var(--accent-line);background:var(--accent-soft);color:var(--accent-ink)}.viz-chip-text{overflow-wrap:anywhere;font-weight:500}.viz-chip-note{color:var(--ink-muted);font-size:13px}.viz-chip.is-hi .viz-chip-note{color:var(--accent-ink)}.viz-compare{grid-template-columns:1fr;gap:12px;display:grid}.viz-col{border:1px solid var(--border);background:var(--page);border-radius:10px;padding:14px 16px}.viz-col-title{font:600 15px/1.4 var(--sans);color:var(--ink);margin:0!important}.viz-col-list{font:400 14px/1.5 var(--sans);color:var(--ink);margin:8px 0 0;padding-left:18px}.viz-col-list li+li{margin-top:4px}@media (width>=560px){.viz-compare{grid-template-columns:1fr 1fr}}@media 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