.pr-chapter{--pr-hairline:color-mix(in srgb, var(--color-line) 78%, transparent);--pr-water-wash:color-mix(in srgb, var(--color-water) 8%, var(--color-paper-2));--pr-heat-wash:color-mix(in srgb, var(--color-copper) 8%, var(--color-paper-2));--pr-raised:color-mix(in srgb, var(--color-paper-3) 92%, var(--color-water) 8%)}.pr-kicker{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.15em;text-transform:uppercase;font-size:.65rem;font-weight:500;line-height:1.35;display:block}.pr-text-link,.pr-text-button{color:var(--color-water-2);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;font-size:.7rem;font-weight:500;text-decoration:none;transition:color .16s,border-color .16s}.pr-text-link{border-bottom:1px solid color-mix(in srgb, var(--color-water) 35%, transparent)}.pr-text-button{border:0;border-bottom:1px solid color-mix(in srgb, var(--color-water) 35%, transparent);cursor:pointer;background:0 0;align-items:center;min-height:44px;padding:0 .2rem;display:inline-flex}.pr-text-link:hover,.pr-text-button:hover{color:var(--color-water);border-color:var(--color-water)}.pr-text-link:focus-visible,.pr-text-button:focus-visible,.pr-primary-button:focus-visible,.pr-secondary-button:focus-visible,.pr-plate-nav button:focus-visible,.pr-manipulation button:focus-visible,.pr-checkpoint input:focus-visible,.pr-probe-point button:focus-visible,.pr-reading__toggle:focus-visible,.pr-answer-field input:focus-visible,.pr-answer textarea:focus-visible,.pr-activity-reflection textarea:focus-visible,.pr-activity-reflection summary:focus-visible,.pr-molecular-controls button:focus-visible,.pr-molar-mass__stepper button:focus-visible{outline:2px solid var(--color-water);outline-offset:3px}.pr-primary-button{border:1px solid var(--color-water-2);background:var(--color-water);min-height:2.75rem;color:var(--color-paper-2);cursor:pointer;font-family:var(--font-sans);border-radius:999px;padding:.65rem 1.25rem;font-size:.82rem;font-weight:600;transition:transform .16s,box-shadow .16s,background .16s}.pr-primary-button:hover{background:var(--color-cyan-numeric);box-shadow:0 10px 26px -18px var(--color-water);transform:translateY(-1px)}.pr-secondary-button{border:1px solid var(--color-line);min-height:2.75rem;color:var(--color-ink);cursor:pointer;background:0 0;border-radius:999px;padding:.55rem 1.1rem;font-size:.78rem;font-weight:600;transition:border-color .16s,color .16s,background .16s}.pr-secondary-button:hover{border-color:var(--color-water);background:var(--pr-water-wash);color:var(--color-water)}.pr-primary-button:disabled,.pr-secondary-button:disabled,.pr-text-button:disabled{cursor:not-allowed;opacity:.45;transform:none}.pr-chapter{width:min(100%,100rem);margin:0 auto;padding:1.75rem 1.25rem 4rem}.pr-chapter__head{border-bottom:1px solid var(--color-gold-soft);grid-template-columns:minmax(18rem,.8fr) minmax(20rem,1.4fr) auto;align-items:end;gap:1rem 3rem;margin-bottom:1.4rem;padding:0 .5rem 1.4rem;display:grid}.pr-chapter__head h1{color:var(--color-ink);font-family:var(--font-serif);letter-spacing:-.035em;margin:.35rem 0 0;font-size:clamp(2.3rem,3.4vw,3.5rem);font-weight:400;line-height:1}.pr-chapter__head>p{max-width:48rem;color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:0;font-size:.9rem;font-style:italic;line-height:1.6}.pr-room__context{color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;align-items:center;gap:.65rem;margin-bottom:.75rem;font-size:.63rem;display:flex}.pr-room-loading{border:1px solid var(--color-gold-soft);background:var(--color-paper-2);min-height:32rem;color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;place-items:center;font-size:.65rem;display:grid}.pr-noscript{border:1px solid var(--color-gold-soft);background:var(--color-paper-2);color:var(--color-ink);padding:clamp(1.25rem,4vw,3rem)}.pr-noscript h2,.pr-noscript h3{font-family:var(--font-serif);font-weight:400}.pr-noscript ol{padding-left:1.25rem}.pr-noscript li{border-top:1px solid var(--color-line);margin-top:2rem;padding-top:1rem}.pr-noscript p{font-family:var(--font-serif-body);white-space:pre-line;line-height:1.65}.pr-room__saved{margin-left:auto}.pr-room__layout{border:1px solid var(--color-gold-soft);background:color-mix(in srgb, var(--color-paper-2) 82%, transparent);box-shadow:var(--shadow-elevation-1);grid-template-columns:minmax(13.5rem,.64fr) minmax(36rem,1.82fr) minmax(19rem,.86fr);align-items:start;display:grid}.pr-guide{scrollbar-color:var(--color-line) transparent;scrollbar-width:thin;max-height:calc(100svh - 2rem);position:sticky;top:1rem;overflow:auto}.pr-workbench{background:var(--color-paper);min-width:0}.pr-problem-head{min-height:11.5rem;padding:clamp(1.5rem,2.4vw,2rem)}.pr-problem-head__status{justify-content:space-between;align-items:center;gap:1rem;display:flex}.pr-problem-head__meta{color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;align-items:center;gap:.55rem;font-size:.62rem;display:inline-flex}.pr-problem-head__meta>span+span{border-left:1px solid var(--pr-hairline,var(--color-line));padding-left:.55rem}.pr-problem-head h2{max-width:52rem;color:var(--color-ink);font-family:var(--font-serif-body);white-space:pre-line;margin:1.15rem 0 0;font-size:clamp(1.05rem,1.65vw,1.35rem);font-weight:400;line-height:1.58}.pr-workbench__visual{padding:clamp(1rem,2vw,1.75rem)}.pr-plate-nav{border:1px solid var(--pr-hairline);background:color-mix(in srgb, var(--color-paper-2) 88%, transparent);grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;width:min(100%,30rem);margin-bottom:.75rem;display:grid}.pr-plate-nav button{border:0;border-right:1px solid var(--pr-hairline);min-height:3.45rem;color:var(--color-cyan-metadata);cursor:pointer;text-align:left;background:0 0;align-content:center;gap:.18rem;padding:.6rem .85rem .65rem;transition:background .16s,color .16s;display:grid;position:relative}.pr-plate-nav button:last-child{border-right:0}.pr-plate-nav button>span{font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;font-size:.62rem}.pr-plate-nav button>small{color:var(--color-ink-muted);font-family:var(--font-serif-body);font-size:.7rem;line-height:1.2}.pr-plate-nav button:after{content:"";inset-block:0;background:0 0;width:2px;position:absolute;left:-1px}.pr-plate-nav button:hover,.pr-plate-nav button[aria-selected=true]{background:var(--pr-water-wash);color:var(--color-ink)}.pr-plate-nav button[aria-selected=true]:after{background:var(--color-water)}.pr-visual-panel[hidden]{display:none}.pr-visual{border:1px solid var(--color-line);background:linear-gradient(var(--color-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-grid) 1px, transparent 1px), linear-gradient(145deg, color-mix(in srgb, var(--color-paper-3) 92%, var(--color-water) 8%), var(--color-paper-2));box-shadow:inset 0 1px 0 var(--color-ink-ghost), 0 24px 48px -38px #000000bf;background-size:20px 20px,20px 20px,auto;margin:0;overflow:hidden}.pr-visual__caption{border-bottom:1px solid var(--pr-hairline);justify-content:space-between;align-items:center;gap:1rem;padding:.9rem 1rem;display:flex}.pr-visual__caption strong{color:var(--color-ink);font-family:var(--font-serif);margin-top:.22rem;font-size:1.05rem;font-weight:400;display:block}.pr-visual__legend{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:.55rem}.pr-visual__mobile-hint{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:.55rem;display:none}.pr-visual__legend:before{background:var(--color-water);width:.45rem;height:.45rem;box-shadow:0 0 0 3px color-mix(in srgb, var(--color-water) 15%, transparent);content:"";border-radius:50%;margin-right:.4rem;display:inline-block}.pr-visual__canvas{min-height:22rem;position:relative}.pr-visual-loading,.pr-visual-fallback{border:1px solid var(--color-line);background:linear-gradient(var(--color-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-grid) 1px, transparent 1px), var(--color-paper-2);min-height:22rem;color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.1em;text-align:center;text-transform:uppercase;background-size:20px 20px;place-items:center;padding:2rem;font-size:.65rem;display:grid}.pr-visual-fallback div{max-width:32rem}.pr-visual-fallback strong{color:var(--color-ink);font-family:var(--font-serif);letter-spacing:0;text-transform:none;font-size:1.25rem;font-weight:400;display:block}.pr-visual-fallback p{color:var(--color-ink-muted);font-family:var(--font-serif-body);letter-spacing:0;text-transform:none;margin:.75rem 0 0;font-size:.9rem;line-height:1.6}.pr-svg{width:100%;height:auto;min-height:22rem;max-height:30rem;color:var(--color-cyan-metadata);display:block}.pr-svg text{fill:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.07em;font-size:10px}.pr-svg .pr-svg-label{fill:var(--color-cyan-label);letter-spacing:.14em;font-size:10px}.pr-svg .pr-svg-value{fill:var(--color-cyan-numeric);letter-spacing:.04em;font-size:12px}.pr-svg .pr-svg-equation{fill:var(--color-cyan-formula);font-size:12px}.pr-svg-grid line{stroke:var(--color-grid-2);stroke-width:.8px}.pr-svg-duty line,.pr-svg-duty circle,.pr-svg-water>rect:first-of-type,.pr-svg-water>line,.pr-svg-air>path:first-of-type,.pr-svg-air>line{fill:var(--color-paper-2);stroke:var(--color-line);stroke-width:1.3px}.pr-svg-duty line{stroke:var(--color-gold)}.pr-svg-duty circle{fill:var(--color-gold);stroke:none}.pr-flow-dashes{stroke:var(--color-water);stroke-dasharray:8 7;stroke-linecap:round;stroke-width:2.2px}.pr-air-stream{fill:none;stroke:var(--color-copper);stroke-dasharray:7 9;stroke-linecap:round;stroke-width:1.3px}.pr-tower>path:first-child{fill:color-mix(in srgb, var(--color-paper-3) 84%, transparent);stroke:var(--color-water-2);stroke-width:2px}.pr-tower>path:not(:first-child){stroke:var(--color-water-2);stroke-width:1px}.pr-stream path,.pr-recirculation>path:first-child{fill:none;stroke:var(--color-water);stroke-width:3px}.pr-stream--evaporation path{stroke:var(--color-steam);stroke-width:7px}.pr-stream circle,.pr-recirculation circle{fill:var(--color-paper-3);stroke:var(--color-line);stroke-width:1.4px}.pr-stream--blowdown>path:last-child,.pr-recirculation>path:last-of-type{fill:var(--color-water-2);stroke:none}.pr-equation-plate rect,.pr-diagnostic-head rect,.pr-diagnostic-path rect{fill:var(--color-paper-3);stroke:var(--color-line)}.pr-diagnostic-head>path,.pr-diagnostic-trunk>path,.pr-diagnostic-path>path,.pr-diagnostic-note path{fill:none;stroke:var(--color-line);stroke-width:1.4px}.pr-diagnostic-head circle{fill:var(--pr-heat-wash);stroke:var(--color-copper)}.pr-diagnostic-trunk>circle,.pr-diagnostic-path>circle{fill:var(--color-water)}.pr-visual[data-revealed=true] .pr-diagnostic-path rect{stroke:var(--color-water-2)}.pr-system-curve>path:first-child,.pr-system-curve>line{fill:none;stroke:var(--color-line)}.pr-system-curve>path:nth-child(2){fill:none;stroke:var(--color-water);stroke-width:2.6px}.pr-system-curve__secondary{fill:none;stroke:var(--color-copper);stroke-dasharray:7 6;stroke-width:1.5px}.pr-system-curve circle{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:2px}.pr-system-curve line{stroke:var(--color-line);stroke-dasharray:3 5}.pr-system-layer>path{fill:color-mix(in srgb, var(--color-water) 9%, var(--color-paper-3));stroke:var(--color-water-2);stroke-width:1.4px}.pr-system-layer>path:nth-child(2){fill:color-mix(in srgb, var(--color-gold) 16%, var(--color-paper-3));stroke:var(--color-gold)}.pr-system-layer>path:nth-child(3){fill:color-mix(in srgb, var(--color-copper) 13%, var(--color-paper-3));stroke:var(--color-copper)}.pr-system-layer line{stroke:var(--color-line)}.pr-molecules circle{fill:var(--color-water);opacity:.5}.pr-svg marker path{fill:var(--color-water-2)}.pr-svg .pr-marker--water path{fill:var(--color-water)}.pr-svg .pr-marker--heat path{fill:var(--color-copper)}.pr-svg .pr-marker--steam path{fill:var(--color-steam)}.pr-svg-copy{height:100%;color:var(--color-ink);font-family:var(--font-serif-body);align-items:center;font-size:13px;line-height:1.3;display:flex;overflow:hidden}.pr-svg-copy--center{text-align:center;justify-content:center}.pr-svg-copy--small{font-size:11px;line-height:1.25}.pr-comparison__criterion rect{fill:var(--color-paper-3);stroke:var(--color-gold);stroke-width:1.4px}.pr-comparison__panel>rect{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--color-line);stroke-width:1.2px}.pr-comparison__panel:nth-of-type(2)>rect{fill:var(--pr-water-wash);stroke:var(--color-water-2)}.pr-comparison__panel:nth-of-type(3)>rect{fill:var(--pr-heat-wash);stroke:var(--color-copper)}.pr-comparison__panel circle{fill:var(--color-water)}.pr-comparison__panel>rect+rect{fill:var(--color-copper);stroke:none}.pr-comparison__panel>path,.pr-comparison__connectors path,.pr-comparison__footer path{fill:none;stroke:var(--color-line);stroke-width:1.3px}.pr-comparison__connectors path{stroke:var(--color-water-2)}.pr-comparison__footer path{stroke:var(--color-gold-soft)}.pr-transport-scale__duty rect{fill:var(--color-paper-3);stroke:var(--color-gold)}.pr-transport-scale__duty path{fill:none;stroke:var(--color-gold);stroke-width:1.5px}.pr-transport-scale__water circle:first-of-type{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:2px}.pr-transport-scale__water circle:nth-of-type(2){fill:var(--color-water)}.pr-transport-scale__water path{fill:none;stroke:var(--color-water-2)}.pr-transport-scale__air rect{fill:color-mix(in srgb, var(--color-paper-2) 94%, var(--color-copper) 6%);stroke:var(--color-copper);stroke-width:1.5px}.pr-transport-scale__air path{fill:none;stroke:var(--color-copper);stroke-dasharray:7 7;stroke-width:1.2px}.pr-transport-scale__ratio path{fill:none;stroke:var(--color-gold);stroke-width:1.4px}.pr-balance__boundary>rect{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--color-water-2);stroke-width:1.5px}.pr-balance__boundary>path,.pr-balance__ledger path{fill:none;stroke:var(--color-line)}.pr-balance__inventory circle{fill:var(--color-water);opacity:.62}.pr-balance__stream>path{fill:none;stroke:var(--color-water);stroke-width:2.4px}.pr-balance__stream--out>path{stroke:var(--color-copper)}.pr-balance__ledger path{stroke:var(--color-gold-soft)}.pr-tower>path:nth-child(2){fill:color-mix(in srgb, var(--color-water) 28%, var(--color-paper-3));stroke:var(--color-water-2)}.pr-tower>path:nth-child(3){fill:none}.pr-diagnostic-generic__observation rect,.pr-diagnostic-generic__path rect{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--color-line);stroke-width:1.2px}.pr-diagnostic-generic__observation rect{fill:var(--pr-heat-wash);stroke:var(--color-copper)}.pr-diagnostic-generic__trunk path,.pr-diagnostic-generic__path path,.pr-diagnostic-generic__footer path{fill:none;stroke:var(--color-line);stroke-width:1.3px}.pr-diagnostic-generic__trunk circle{fill:var(--color-copper)}.pr-diagnostic-generic__path:nth-of-type(3) rect{stroke:var(--color-water-2)}.pr-diagnostic-generic__path:nth-of-type(4) rect{stroke:var(--color-gold)}.pr-cause-chain__spine path{fill:none;stroke:var(--color-water-2);stroke-width:2px}.pr-cause-chain__stage circle{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:2px}.pr-cause-chain__stage>path,.pr-cause-chain__footer path{fill:none;stroke:var(--color-line)}.pr-cause-chain__stage:nth-of-type(4) circle{stroke:var(--color-copper)}.pr-cause-chain__footer path{stroke:var(--color-gold-soft)}.pr-before-after__panel rect{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--color-line)}.pr-before-after__panel--before>path{fill:none;stroke:var(--color-copper);stroke-dasharray:6 5;stroke-width:2px}.pr-before-after__panel--after>path{fill:none;stroke:var(--color-water);stroke-width:2px}.pr-before-after__intervention>path:first-child{fill:var(--pr-water-wash);stroke:var(--color-gold)}.pr-before-after__intervention>path:last-child,.pr-before-after__footer path{fill:none;stroke:var(--color-line)}.pr-before-after__footer path{stroke:var(--color-gold-soft)}.pr-layer-view__medium>path{fill:none;stroke:var(--color-line)}.pr-layer-view__medium circle{fill:var(--color-water);opacity:.48}.pr-layer-view__layers path{stroke-width:1.4px}.pr-layer-view__layers path:first-child{fill:color-mix(in srgb, var(--color-paper-3) 78%, var(--color-water) 22%);stroke:var(--color-water-2)}.pr-layer-view__layers path:nth-child(2){fill:color-mix(in srgb, var(--color-paper-3) 78%, var(--color-gold) 22%);stroke:var(--color-gold)}.pr-layer-view__layers path:nth-child(3){fill:color-mix(in srgb, var(--color-paper-3) 80%, var(--color-copper) 20%);stroke:var(--color-copper)}.pr-layer-view__labels path{fill:none;stroke:var(--color-line)}.pr-layer-view__surface{fill:none;stroke:var(--color-copper);stroke-width:3px}.pr-molecular__field circle{fill:var(--color-water);opacity:.25}.pr-molecular__structure ellipse{fill:none;stroke:var(--color-line);stroke-dasharray:4 6}.pr-molecular__structure>path{fill:none;stroke:var(--color-line);stroke-width:6px}.pr-molecular__structure circle:nth-of-type(-n+4){fill:color-mix(in srgb, var(--color-paper-3) 70%, var(--color-water) 30%);stroke:var(--color-water);stroke-width:2px}.pr-molecular__structure circle:first-of-type{fill:color-mix(in srgb, var(--color-paper-3) 70%, var(--color-copper) 30%);stroke:var(--color-copper)}.pr-molecular__structure circle:nth-of-type(n+5){fill:var(--color-ink);stroke:none}.pr-molecular__callouts path,.pr-operating__axes path,.pr-operating__curve path{fill:none;stroke:var(--color-line)}.pr-operating__band rect{fill:color-mix(in srgb, var(--color-water) 8%, transparent);stroke:color-mix(in srgb, var(--color-water) 32%, transparent);stroke-dasharray:4 5}.pr-operating__curve>path:first-child{stroke:var(--color-water);stroke-width:2px}.pr-operating__curve g path{stroke-dasharray:3 5}.pr-operating__curve circle{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:2px}.pr-operating__curve g:nth-of-type(2) circle{fill:var(--color-water)}.pr-cycles__axes path,.pr-cycles__curve path,.pr-cycles__point>path{fill:none;stroke:var(--color-line)}.pr-cycles__axes>text:not(.pr-svg-label){fill:var(--color-ink-faint);font-family:var(--font-mono);letter-spacing:.08em;font-size:9px}.pr-cycles__curve>path:first-child{stroke:var(--color-water);stroke-width:2.6px}.pr-cycles__curve>path:nth-child(2){stroke:var(--color-gold);stroke-dasharray:5 6}.pr-cycles__point>path{stroke-dasharray:3 5}.pr-cycles__point circle{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:2px}.pr-cycles__point rect,.pr-cycles__savings rect{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--color-line)}.pr-cycles__point--target circle{fill:var(--color-water)}.pr-cycles__point--target rect{fill:var(--pr-water-wash);stroke:var(--color-water-2)}.pr-cycles__savings rect{fill:var(--pr-heat-wash);stroke:var(--color-copper)}.pr-cost__axis path{fill:none;stroke:var(--color-line)}.pr-cost__bar rect{stroke:var(--color-paper-3);stroke-width:1.5px}.pr-cost__bar rect:first-of-type{fill:color-mix(in srgb, var(--color-water) 52%, var(--color-paper-3))}.pr-cost__bar rect:nth-of-type(2){fill:color-mix(in srgb, var(--color-gold) 45%, var(--color-paper-3))}.pr-cost__bar rect:nth-of-type(3){fill:color-mix(in srgb, var(--color-copper) 52%, var(--color-paper-3))}.pr-cost__legend text,.pr-cost__result>text:not(.pr-svg-label,.pr-svg-equation){fill:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.06em;font-size:10px}.pr-cost__legend circle:first-of-type{fill:var(--color-water)}.pr-cost__legend circle:nth-of-type(2){fill:var(--color-gold)}.pr-cost__legend circle:nth-of-type(3){fill:var(--color-copper)}.pr-cost__result rect{fill:var(--pr-water-wash);stroke:var(--color-water-2)}.pr-constraint__input path,.pr-constraint__output path{fill:none;stroke:var(--color-water);stroke-width:2.2px}.pr-constraint__gates>g>path{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--color-line)}.pr-constraint__gates>g>rect{fill:var(--pr-water-wash);stroke:var(--color-water-2)}.pr-constraint__gates>g:nth-child(2)>rect{fill:color-mix(in srgb, var(--color-gold) 12%, var(--color-paper-3));stroke:var(--color-gold)}.pr-constraint__gates>g:nth-child(3)>rect{fill:var(--pr-heat-wash);stroke:var(--color-copper)}.pr-constraint__output circle{fill:var(--color-copper)}.pr-control__process rect{fill:color-mix(in srgb, var(--color-paper-3) 88%, var(--color-water) 12%);stroke:var(--color-water-2);stroke-width:1.5px}.pr-control__node--measure circle{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:2px}.pr-control__node--decide>path{fill:var(--pr-heat-wash);stroke:var(--color-copper);stroke-width:1.5px}.pr-control__loop path{fill:none;stroke:var(--color-water-2);stroke-width:1.8px}.pr-manipulation{border:1px solid var(--color-line);background:linear-gradient(var(--color-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-grid) 1px, transparent 1px), linear-gradient(145deg, color-mix(in srgb, var(--color-paper-3) 92%, var(--color-water) 8%), var(--color-paper-2));min-height:22rem;box-shadow:inset 0 1px 0 var(--color-ink-ghost), 0 24px 48px -38px #000000bf;background-size:20px 20px,20px 20px,auto;overflow:hidden}.pr-manipulation__head{border-bottom:1px solid var(--color-line);background:color-mix(in srgb, var(--color-paper-3) 86%, transparent);grid-template-columns:minmax(0,1fr) 9rem;align-items:stretch;display:grid}.pr-manipulation__heading{gap:.38rem;padding:clamp(1.15rem,2.6vw,1.65rem);display:grid}.pr-manipulation__head h3{color:var(--color-ink);font-family:var(--font-serif);margin:0;font-size:clamp(1.45rem,2.4vw,2rem);font-weight:400;line-height:1.08}.pr-manipulation__head p{max-width:42rem;color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:0;font-size:.84rem;line-height:1.58}.pr-manipulation__progress{border-left:1px solid var(--color-line);align-content:center;gap:.35rem;padding:1rem 1.15rem;display:grid}.pr-manipulation__progress>span{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:.53rem}.pr-manipulation__progress strong{color:var(--color-water);font-family:var(--font-mono);font-size:1.75rem;font-weight:400;line-height:1}.pr-manipulation__progress strong small{color:var(--color-ink-muted);font-size:.78rem}.pr-manipulation__progress progress{appearance:none;background:var(--pr-hairline);width:100%;height:2px;color:var(--color-water);border:0;overflow:hidden}.pr-manipulation__progress progress::-webkit-progress-bar{background:var(--pr-hairline)}.pr-manipulation__progress progress::-webkit-progress-value{background:var(--color-water);transition:width .2s}.pr-manipulation__progress progress::-moz-progress-bar{background:var(--color-water)}.pr-manipulation__body{grid-template-columns:minmax(15rem,.78fr) minmax(22rem,1.22fr);display:grid}.pr-manipulation__source,.pr-manipulation__destination{min-width:0;padding:clamp(1.15rem,2.5vw,1.7rem)}.pr-manipulation__source{border-right:1px solid var(--color-line);background:color-mix(in srgb, var(--color-paper-3) 78%, transparent)}.pr-manipulation__destination{background:color-mix(in srgb, var(--color-paper-2) 78%, transparent)}.pr-manipulation__section-head{grid-template-columns:auto minmax(0,1fr);align-items:center;gap:.2rem .7rem;margin-bottom:1rem;display:grid}.pr-manipulation__section-head>div{gap:.16rem;display:grid}.pr-manipulation__section-head>div>span,.pr-manipulation__section-head>p{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;margin:0;font-size:.53rem;line-height:1.4}.pr-manipulation__section-number{border:1px solid var(--color-water-2);width:2rem;height:2rem;color:var(--color-water);font-family:var(--font-mono);grid-row:1/span 2;place-items:center;font-size:.75rem;display:grid}.pr-manipulation__section-head h4{color:var(--color-ink);font-family:var(--font-serif);margin:0;font-size:1.15rem;font-weight:400}.pr-manipulation__section-head>p{max-width:100%;color:var(--color-ink-muted);text-align:left;text-transform:none;grid-column:2}.pr-manipulation__pool{grid-template-columns:1fr;gap:.7rem;min-height:6.25rem;display:grid}.pr-manipulation__item{border:1px solid var(--pr-hairline);background:radial-gradient(circle at .58rem .58rem, var(--color-cyan-metadata) 1px, transparent 1.5px) 0 0 / .32rem .32rem no-repeat, color-mix(in srgb, var(--color-paper-3) 92%, transparent);min-width:0;min-height:6.35rem;color:var(--color-ink);cursor:grab;text-align:left;align-content:center;gap:.42rem;padding:1rem 2.9rem 1rem 1.35rem;transition:border-color .16s,background .16s,box-shadow .16s,color .16s,transform .16s;display:grid;position:relative}.pr-manipulation__item[hidden]{display:none}.pr-manipulation__item:before{background:radial-gradient(circle, var(--color-cyan-metadata) 1px, transparent 1.5px) 0 0 / .24rem .24rem;content:"";width:.48rem;height:1rem;position:absolute;top:50%;left:.45rem;transform:translateY(-50%)}.pr-manipulation__item:after{color:var(--color-cyan-metadata);content:attr(data-card);font-family:var(--font-mono);letter-spacing:.07em;font-size:.52rem;position:absolute;top:.8rem;right:.8rem}.pr-manipulation__item:hover,.pr-manipulation__item[aria-pressed=true]{border-color:var(--color-water-2);background:var(--pr-water-wash);color:var(--color-water);transform:translateY(-1px)}.pr-manipulation__item[aria-pressed=true]{box-shadow:inset 3px 0 0 var(--color-water), 0 10px 24px -18px color-mix(in srgb, var(--color-water) 65%, transparent)}.pr-manipulation__item>strong,.pr-manipulation__placed strong{font-size:.83rem;font-weight:600;line-height:1.35}.pr-manipulation__item small,.pr-manipulation__placed small{color:var(--color-ink-muted);font-family:var(--font-serif-body);font-size:.74rem;line-height:1.5}.pr-manipulation__pool-empty{border:1px dashed var(--color-water-2);background:var(--pr-water-wash);min-height:6.25rem;color:var(--color-ink-muted);font-family:var(--font-serif-body);text-align:center;grid-column:1/-1;align-items:center;margin:0;padding:1rem;font-size:.74rem;display:grid}.pr-manipulation__slots{grid-template-columns:1fr;gap:.85rem;display:grid}.pr-manipulation__slot{border:1px dashed var(--color-line);background:color-mix(in srgb, var(--color-paper-2) 82%, transparent);min-width:0;min-height:7.8rem;color:var(--color-ink);cursor:pointer;text-align:left;align-content:start;gap:.7rem;padding:.9rem 1rem;transition:border-color .16s,background .16s,box-shadow .16s,transform .16s;display:grid;position:relative}.pr-manipulation__slot:after{background:var(--color-water-2);content:"";z-index:1;width:1px;height:.86rem;position:absolute;bottom:-.86rem;left:2rem}.pr-manipulation__slot:last-child:after,.pr-manipulation[data-mode=match] .pr-manipulation__slot:after{display:none}.pr-manipulation[data-mode=match] .pr-manipulation__slot{border-style:solid}.pr-manipulation__slot:hover,.pr-manipulation__slot[aria-pressed=true],.pr-manipulation__slot[data-ready=true],.pr-manipulation__slot[data-drop-active=true]{border-color:var(--color-water-2);background:var(--pr-water-wash)}.pr-manipulation__slot[aria-pressed=true]{box-shadow:inset 0 0 0 2px var(--color-water)}.pr-manipulation__slot[data-drop-active=true]{box-shadow:inset 0 0 0 2px var(--color-water), 0 14px 30px -24px color-mix(in srgb, var(--color-water) 70%, transparent);border-style:solid;transform:translateY(-2px)}.pr-manipulation__slot[data-filled=true]{background:color-mix(in srgb, var(--color-paper-3) 88%, var(--color-water) 12%);border-style:solid}.pr-manipulation__slot[data-result=correct]{background:color-mix(in srgb, var(--color-water) 10%, var(--color-paper-2));box-shadow:inset 0 3px 0 var(--color-water)}.pr-manipulation__slot[data-result=incorrect]{background:color-mix(in srgb, var(--color-copper) 9%, var(--color-paper-2));box-shadow:inset 0 3px 0 var(--color-copper)}.pr-manipulation__slot-head{justify-content:space-between;align-items:center;gap:.5rem;display:flex}.pr-manipulation__slot-identity{align-items:center;gap:.65rem;min-width:0;display:flex}.pr-manipulation__slot-index{border:1px solid var(--color-line);width:2rem;height:2rem;color:var(--color-water);font-family:var(--font-mono);flex:none;place-items:center;font-size:.62rem;display:grid}.pr-manipulation__slot-label{color:var(--color-ink);font-family:var(--font-serif);text-overflow:ellipsis;white-space:nowrap;font-size:.95rem;line-height:1.15;overflow:hidden}.pr-manipulation__slot-state{border:1px solid var(--pr-hairline);color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;padding:.18rem .3rem;font-size:.46rem}.pr-manipulation__slot[data-filled=true] .pr-manipulation__slot-state{border-color:color-mix(in srgb, var(--color-water) 52%, transparent);color:var(--color-water)}.pr-manipulation__placed{border-left:2px solid var(--color-water);gap:.35rem;margin-left:2.65rem;padding-left:.8rem;display:grid}.pr-manipulation__empty{align-content:space-between;align-self:stretch;gap:.7rem;margin-left:2.65rem;display:grid}.pr-manipulation__hint{color:var(--color-ink-muted);font-family:var(--font-serif-body);font-size:.74rem;line-height:1.45}.pr-manipulation__empty>small{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;font-size:.49rem}.pr-manipulation__result{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;align-self:end;margin-top:auto;font-size:.52rem}.pr-manipulation__slot[data-result=correct] .pr-manipulation__result{color:var(--color-water)}.pr-manipulation__slot[data-result=incorrect] .pr-manipulation__result{color:var(--color-copper)}.pr-manipulation__footer{border-top:1px solid var(--color-line);background:color-mix(in srgb, var(--color-paper-3) 80%, transparent);grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:1.25rem;padding:.9rem clamp(1rem,2.4vw,1.5rem);display:grid}.pr-manipulation__status{color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:0;font-size:.75rem;line-height:1.5}.pr-manipulation[data-complete=true] .pr-manipulation__status{color:var(--color-water)}.pr-manipulation__actions{align-items:center;gap:.85rem;display:flex}.pr-workbench__attempt{border-top:1px solid var(--pr-hairline);padding:clamp(1.25rem,3vw,2.25rem)}.pr-workbench__attempt[hidden]{display:none}.pr-activity__actions{flex-wrap:wrap;align-items:center;gap:.75rem 1rem;margin-top:1.25rem;display:flex}.pr-activity__gate{color:var(--color-ink-muted);font-family:var(--font-sans);margin:0;font-size:.82rem}.pr-answer--activity .pr-primary-button[disabled]{cursor:not-allowed;opacity:.45}.pr-answer__head h3,.pr-guide-section__head h3{color:var(--color-ink);font-family:var(--font-serif);margin:.35rem 0 0;font-size:1.45rem;font-weight:400;line-height:1.2}.pr-answer__head p{color:var(--color-ink-muted);margin:.35rem 0 0;font-size:.78rem}.pr-answer-grid{border-top:1px solid var(--pr-hairline);grid-template-columns:repeat(2,minmax(0,1fr));margin-top:1.3rem;display:grid}.pr-answer-field{border-right:1px solid var(--pr-hairline);border-bottom:1px solid var(--pr-hairline);grid-template-columns:1.7rem minmax(0,1fr);gap:.45rem;min-width:0;padding:1rem 1rem 1rem 0;display:grid}.pr-answer-field:nth-child(2n){border-right:0;padding-left:1rem}.pr-answer-field__index{color:var(--color-accent-ink);font-family:var(--font-mono);grid-row:1/span 3;font-size:.58rem}.pr-answer-field__label{color:var(--color-ink);text-transform:capitalize;font-size:.76rem;font-weight:500}.pr-answer-field__control{align-items:baseline;gap:.6rem;display:flex}.pr-answer-field input{border:0;border-bottom:1px solid var(--color-line);width:min(100%,12rem);color:var(--color-cyan-numeric);font-family:var(--font-mono);background:0 0;border-radius:0;padding:.45rem 0;font-size:1.05rem}.pr-answer-field__control>span{color:var(--color-cyan-metadata);font-family:var(--font-mono);font-size:.63rem}.pr-answer-field__feedback{min-height:2rem;color:var(--color-ink-muted);font-size:.67rem;line-height:1.4}.pr-answer-field[data-verdict=correct]{background:color-mix(in srgb, var(--color-water) 5%, transparent)}.pr-answer-field[data-verdict=correct] input,.pr-answer-field[data-verdict=correct] .pr-answer-field__feedback{color:var(--color-water)}.pr-answer-field[data-verdict=close] input,.pr-answer-field[data-verdict=close] .pr-answer-field__feedback,.pr-answer-field[data-verdict=incorrect-sign] input,.pr-answer-field[data-verdict=incorrect-sign] .pr-answer-field__feedback,.pr-answer-field[data-verdict=magnitude] input,.pr-answer-field[data-verdict=magnitude] .pr-answer-field__feedback,.pr-answer-field[data-verdict=incorrect] input,.pr-answer-field[data-verdict=incorrect] .pr-answer-field__feedback,.pr-answer-field[data-verdict=unit-mismatch] input,.pr-answer-field[data-verdict=unit-mismatch] .pr-answer-field__feedback{color:var(--color-copper)}.pr-answer__actions{align-items:center;gap:1rem;margin-top:1.4rem;display:flex}.pr-answer__actions>span{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;font-size:.56rem;line-height:1.5}.pr-answer textarea{resize:vertical;border:1px solid var(--color-line);background:var(--color-paper-2);width:100%;color:var(--color-ink);font-family:var(--font-serif-body);border-radius:0;margin:1.25rem 0;padding:1rem;font-size:1rem;line-height:1.65}.pr-answer textarea::placeholder{color:var(--color-ink-muted)}.pr-checkpoint{border:0;border-top:1px solid var(--color-gold-soft);border-bottom:1px solid var(--pr-hairline);margin:1.5rem 0 0;padding:1.2rem 0}.pr-checkpoint legend{gap:.45rem;width:100%;padding:0;display:grid}.pr-checkpoint__prompt{max-width:42rem;color:var(--color-ink);font-family:var(--font-serif);font-size:1.15rem;line-height:1.3}.pr-checkpoint__options{border-top:1px solid var(--pr-hairline);grid-template-columns:repeat(2,minmax(0,1fr));margin-top:.9rem;display:grid}.pr-checkpoint__options label{border-right:1px solid var(--pr-hairline);border-bottom:1px solid var(--pr-hairline);min-height:4.5rem;color:var(--color-ink-soft);cursor:pointer;align-items:start;gap:.7rem;padding:.85rem;font-size:.78rem;line-height:1.5;display:flex}.pr-checkpoint__options label:nth-child(2n){border-right:0}.pr-checkpoint__options label:hover{background:var(--pr-water-wash);color:var(--color-ink)}.pr-checkpoint__options label[data-result=correct]{background:color-mix(in srgb, var(--color-water) 8%, transparent);color:var(--color-water)}.pr-checkpoint__options label[data-result=incorrect]{background:color-mix(in srgb, var(--color-copper) 8%, transparent);color:var(--color-copper)}.pr-checkpoint__options input{width:1rem;height:1rem;accent-color:var(--color-water);flex:none;margin-top:.12rem}.pr-checkpoint__actions{grid-template-columns:auto 1fr;align-items:center;gap:1rem;margin-top:1rem;display:grid}.pr-checkpoint__feedback{color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:0;font-size:.76rem;line-height:1.5}.pr-checkpoint__feedback[data-result=correct]{color:var(--color-water)}.pr-checkpoint__feedback[data-result=incorrect]{color:var(--color-copper)}.pr-self-check{border:1px solid var(--color-line);gap:0;margin:1.25rem 0 0;padding:0;display:grid}.pr-self-check legend{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;margin-left:.75rem;padding:0 .5rem;font-size:.6rem}.pr-self-check label{border-bottom:1px solid var(--pr-hairline);color:var(--color-ink-soft);cursor:pointer;align-items:start;gap:.75rem;padding:.85rem 1rem;font-size:.8rem;line-height:1.5;display:flex}.pr-self-check input{width:1rem;height:1rem;accent-color:var(--color-water);margin-top:.15rem}.pr-self-check>p{color:var(--color-cyan-metadata);font-family:var(--font-mono);text-transform:uppercase;margin:0;padding:.8rem 1rem;font-size:.58rem}.pr-guide{border-left:1px solid var(--pr-hairline);background:var(--color-paper-2)}.pr-guide-section,.pr-reading,.pr-explanation{border-bottom:1px solid var(--pr-hairline);padding:1.35rem 1.25rem}.pr-guide-copy{color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:.8rem 0 0;font-size:.88rem;line-height:1.65}.pr-hints{margin:1rem 0 1.1rem;padding:0;list-style:none}.pr-hints li{border-top:1px solid var(--pr-hairline);grid-template-columns:1.5rem 1fr;gap:.25rem .65rem;padding:.8rem 0;display:grid}.pr-hints li>span{color:var(--color-accent-ink);font-family:var(--font-mono);grid-row:1/span 2;font-size:.58rem}.pr-hints strong{color:var(--color-ink);font-size:.76rem}.pr-hints p{color:var(--color-ink-muted);margin:0;font-size:.76rem;line-height:1.55}.pr-hint-end{color:var(--color-cyan-metadata);font-family:var(--font-mono);text-transform:uppercase;margin:1rem 0 0;font-size:.6rem}.pr-reading{padding:0}.pr-reading__toggle{width:100%;color:var(--color-ink);cursor:pointer;text-align:left;background:0 0;border:0;justify-content:space-between;align-items:center;gap:1rem;padding:1.35rem 1.25rem;display:flex}.pr-reading__toggle strong{font-family:var(--font-serif);margin-top:.35rem;font-size:1.05rem;font-weight:400;display:block}.pr-reading__toggle>span:last-child{color:var(--color-water-2);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:.57rem}.pr-reading__body{padding:0 1.25rem 1.4rem}.pr-reading__body p{color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:0 0 .85rem;font-size:.82rem;line-height:1.65}.pr-reading__body mark{color:var(--color-accent-ink);background:0 0}.pr-explanation{border-bottom:0}.pr-solution-steps{margin:1.1rem 0 0;padding:0;list-style:none}.pr-solution-steps>li{border-top:1px solid var(--pr-hairline);grid-template-columns:1.5rem minmax(0,1fr);gap:.75rem;padding:1rem 0;display:grid}.pr-solution-steps>li>span{color:var(--color-accent-ink);font-family:var(--font-mono);font-size:.58rem}.pr-solution-steps h4{color:var(--color-ink);margin:0;font-size:.78rem;font-weight:600}.pr-solution-steps p{color:var(--color-ink-muted);font-family:var(--font-serif-body);white-space:pre-line;margin:.35rem 0 0;font-size:.78rem;line-height:1.58}.pr-solution-steps code{border-left:2px solid var(--color-water);background:var(--color-paper);color:var(--color-cyan-formula);font-family:var(--font-mono);white-space:normal;margin-top:.65rem;padding:.55rem .7rem;font-size:.67rem;line-height:1.5;display:block;overflow-x:auto}.pr-authored-key,.pr-mistakes{border-top:1px solid var(--color-gold-soft);margin-top:1.35rem;padding-top:1.15rem}.pr-authored-key p,.pr-mistakes p{color:var(--color-ink-muted);font-family:var(--font-serif-body);white-space:pre-line;margin:.55rem 0 0;font-size:.78rem;line-height:1.62}.pr-mistakes>div{margin-top:.9rem}.pr-mistakes strong{color:var(--color-copper);font-size:.75rem}.pr-explanation>.pr-primary-button{width:100%;margin-top:1.4rem}@media (prefers-reduced-motion:no-preference){.pr-flow-dashes,.pr-air-stream{animation:7s linear infinite paused pr-flow}.pr-visual[data-motion-active=true] .pr-flow-dashes,.pr-visual[data-motion-active=true] .pr-air-stream{animation-play-state:running}.pr-visual[data-revealed=true] .pr-diagnostic-path rect{animation:.36s both pr-path-reveal}.pr-visual[data-revealed=true] .pr-diagnostic-path:nth-child(2) rect{animation-delay:60ms}.pr-visual[data-revealed=true] .pr-diagnostic-path:nth-child(3) rect{animation-delay:.12s}.pr-visual[data-revealed=true] .pr-diagnostic-path:nth-child(4) rect{animation-delay:.18s}}@keyframes pr-flow{to{stroke-dashoffset:-60px}}@keyframes pr-path-reveal{0%{opacity:.45;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media (max-width:84rem){.pr-room__layout{grid-template-columns:minmax(0,1fr)}.pr-guide{border-top:1px solid var(--pr-hairline);border-left:0;grid-column:2;max-height:none;position:static}}@media (max-width:64rem){.pr-chapter__head{grid-template-columns:1fr auto}.pr-chapter__head>p{grid-area:2/1/auto/-1}}@media (max-width:50rem){.pr-chapter{padding:1.5rem .75rem 3rem}.pr-chapter__head{grid-template-columns:1fr;align-items:start;padding-inline:.5rem}.pr-chapter__head>p,.pr-chapter__head>a{grid-column:1}.pr-room__saved{display:none}.pr-room__layout{flex-direction:column;display:flex}.pr-guide{border:0;width:100%;max-height:none;position:static;overflow:visible}.pr-workbench{width:100%}.pr-problem-head{min-height:0;padding:1.35rem 1rem}.pr-problem-head h2{font-size:1rem}.pr-workbench__visual{padding:.75rem}.pr-manipulation__head{grid-template-columns:1fr}.pr-manipulation__progress{border-top:1px solid var(--color-line);border-left:0;grid-template-columns:minmax(0,1fr) auto}.pr-manipulation__progress strong{grid-area:1/2}.pr-manipulation__progress progress{grid-column:1/-1}.pr-manipulation__footer{grid-template-columns:1fr;align-items:start}.pr-manipulation__body{grid-template-columns:1fr}.pr-manipulation__source{border-right:0;border-bottom:1px solid var(--color-line)}.pr-visual__canvas,.pr-svg{min-height:17rem}.pr-visual__canvas{overscroll-behavior-inline:contain;scrollbar-color:var(--color-water-2) transparent;overflow-x:auto}.pr-svg{width:44rem;max-width:none;min-height:22rem}.pr-guide{border-top:1px solid var(--pr-hairline)}}@media (max-width:35rem){.pr-problem-head__status{flex-direction:column;align-items:start}.pr-answer-grid{grid-template-columns:1fr}.pr-answer-field,.pr-answer-field:nth-child(2n){border-right:0;padding:1rem 0}.pr-answer__actions{flex-direction:column;align-items:stretch}.pr-answer__actions .pr-primary-button{width:100%}.pr-manipulation__pool,.pr-checkpoint__options{grid-template-columns:1fr}.pr-checkpoint__options label,.pr-checkpoint__options label:nth-child(2n){border-right:0}.pr-manipulation__section-head{flex-direction:column;align-items:start;gap:.35rem}.pr-manipulation__section-head>p{text-align:left}.pr-manipulation__slots{grid-template-columns:1fr}.pr-manipulation__slot{min-height:7.5rem}.pr-manipulation__slot:after{content:"";inset:auto auto -.86rem 2rem;transform:none}.pr-manipulation__actions{flex-direction:column;align-items:stretch}.pr-checkpoint__actions{grid-template-columns:1fr;align-items:stretch}.pr-manipulation__actions .pr-primary-button,.pr-checkpoint__actions .pr-secondary-button{width:100%}.pr-visual__caption{flex-direction:column;align-items:start}.pr-visual__legend{display:none}.pr-visual__mobile-hint{display:inline}}@media (prefers-reduced-motion:reduce){.pr-primary-button,.pr-secondary-button,.pr-flow-dashes,.pr-air-stream,.pr-diagnostic-path rect{transition:none!important;animation:none!important}}.pr-handle{gap:.35rem;display:grid}.pr-handle__head{justify-content:space-between;align-items:baseline;gap:1rem;display:flex}.pr-handle__label,.pr-gauge__label{font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--color-ink-muted);font-size:.66rem}.pr-handle__value{font-family:var(--font-mono);color:var(--color-cyan-numeric);font-variant-numeric:tabular-nums;font-size:.85rem}.pr-handle__track{cursor:pointer;touch-action:none;height:44px;position:relative}.pr-handle__track:before{content:"";inset-inline:0;background:var(--pr-hairline,var(--color-line));height:2px;position:absolute;top:50%;transform:translateY(-50%)}.pr-handle__fill{background:var(--color-water-2);height:2px;position:absolute;top:50%;left:0;transform:translateY(-50%)}.pr-handle__tick{background:var(--color-line);width:1px;height:10px;position:absolute;top:50%;transform:translate(-50%,-50%)}.pr-handle__thumb{border:1.5px solid var(--color-water-2);background:var(--pr-raised,var(--color-paper));cursor:grab;border-radius:50%;width:16px;height:16px;position:absolute;top:50%;transform:translate(-50%,-50%)}.pr-handle__thumb:after{content:"";position:absolute;inset:-14px}.pr-handle__thumb:focus-visible{outline:2px solid var(--color-water);outline-offset:3px}.pr-handle__thumb:active{cursor:grabbing}.pr-handle__bounds{font-family:var(--font-mono);letter-spacing:.08em;color:var(--color-ink-muted);justify-content:space-between;font-size:.62rem;display:flex}.pr-handle[data-disabled]{opacity:.6}.pr-handle[data-disabled] .pr-handle__track,.pr-handle[data-disabled] .pr-handle__thumb{cursor:default}.pr-gauge{justify-items:start;gap:.35rem;display:grid}.pr-gauge__field{align-items:baseline;gap:.5rem;display:flex}.pr-gauge__field input{border:1px solid var(--pr-hairline,var(--color-line));background:var(--color-paper);width:9rem;color:var(--color-ink);font-family:var(--font-mono);font-variant-numeric:tabular-nums;padding:.5rem .75rem;font-size:.95rem}.pr-gauge__field input:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-gauge__field input:disabled{cursor:not-allowed;opacity:.6}.pr-gauge__unit{font-family:var(--font-mono);letter-spacing:.08em;color:var(--color-ink-muted);font-size:.7rem}.pr-instrument{border-top:1px solid var(--pr-hairline,var(--color-line));gap:.85rem;margin-top:1.25rem;padding-top:1.25rem;display:grid}.pr-instrument__lead{font-family:var(--font-serif-body);color:var(--color-ink-soft);font-size:.95rem;line-height:1.55}.pr-instrument__lead strong{color:var(--color-ink);font-weight:600}.pr-instrument__controls{flex-wrap:wrap;align-items:end;gap:1.5rem;display:flex}.pr-instrument__controls .pr-handle{flex:260px;min-width:220px}.pr-instrument__readout{font-family:var(--font-mono);letter-spacing:.04em;color:var(--color-cyan-label,var(--color-water-2));font-variant-numeric:tabular-nums;font-size:.78rem}.pr-instrument__help{font-family:var(--font-mono);letter-spacing:.08em;color:var(--color-ink-muted);font-size:.66rem}.pr-energy__vessel path{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-width:1.5px}.pr-energy__water{fill:var(--color-water);opacity:.28}.pr-energy__steam path{fill:none;stroke:var(--color-ink-soft);stroke-width:1.2px;stroke-linecap:round}.pr-energy__therm rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-energy__therm line{stroke:var(--color-flame-bright);stroke-dasharray:3 3}.pr-energy__mercury{fill:var(--color-flame);stroke:none}.pr-energy__frame{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-energy__fill--sensible{fill:var(--color-flame);opacity:.85}.pr-energy__fill--latent{fill:var(--color-flame-bright);opacity:.85}.pr-oxygen__readhead .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:24px}.pr-oxygen__axes line,.pr-oxygen__prediction-rail>line:first-child{stroke:var(--pr-hairline,var(--color-line))}.pr-oxygen__axes>text:not(.pr-svg-label){fill:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.06em;font-size:10px}.pr-oxygen__solubility-line{stroke:var(--color-water);stroke-width:2.5px}.pr-oxygen__target{stroke:var(--color-gold);stroke-dasharray:4 5}.pr-oxygen__heat-marker{stroke:var(--color-flame);stroke-width:1.8px}.pr-oxygen__marker-dot{fill:var(--color-water);stroke:var(--color-paper-3);stroke-width:2px}.pr-oxygen__marker-label rect{fill:var(--color-paper-3);stroke:var(--color-water-2)}.pr-oxygen__staircase rect{fill:color-mix(in srgb, var(--color-flame) 72%, var(--color-paper-3));stroke:var(--color-flame-bright)}.pr-oxygen__double,.pr-oxygen__plus{fill:var(--color-flame-bright);font-family:var(--font-mono);font-size:14px;font-weight:600}.pr-oxygen__waiting path{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 6}.pr-oxygen__prediction{stroke:var(--color-water);stroke-width:2px}.pr-oxygen__actual{fill:var(--color-flame-bright);stroke:var(--color-paper-3);stroke-width:2px}.pr-oxygen__ledger-frame{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-oxygen__iron-fill{fill:var(--color-flame);opacity:.86}.pr-oxygen__oxygen-fill{fill:var(--color-water);opacity:.62}.pr-oxygen__rust-ledger path{fill:none;stroke:var(--color-gold);stroke-width:1.5px}.pr-oxygen__deaerator path,.pr-oxygen__boiler path{fill:color-mix(in srgb, var(--color-paper-3) 92%, transparent);stroke:var(--pr-hairline,var(--color-line));stroke-width:1.5px}.pr-oxygen__deaerator>path:first-child{stroke:var(--color-flame)}.pr-oxygen__normal{fill:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.06em;font-size:9px;text-decoration:line-through}.pr-oxygen__pipe line{stroke:var(--color-water);stroke-linecap:round}.pr-oxygen__pipe polygon{fill:var(--color-water)}.pr-oxygen__ppm-cell rect{fill:var(--pr-water-wash);stroke:var(--color-water-2)}.pr-oxygen__load-bar>rect:first-child{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-oxygen__load-bar>rect:nth-child(2){fill:var(--color-water);opacity:.72}.pr-predict{gap:.85rem;display:grid}.pr-predict__actions{flex-wrap:wrap;align-items:center;gap:.85rem 1rem;display:flex}.pr-predict__status{max-width:38rem;color:var(--color-ink-soft);font-family:var(--font-serif-body);font-size:.85rem;line-height:1.45}@media (max-width:48rem){.pr-svg.pr-oxygen{width:100%;min-width:0;min-height:17rem}.pr-svg.pr-oxygen text{letter-spacing:.05em;font-size:14px}.pr-svg.pr-oxygen .pr-svg-label{letter-spacing:.09em;font-size:14px}.pr-svg.pr-oxygen .pr-svg-value{font-size:18px}.pr-svg.pr-oxygen .pr-svg-equation{font-size:14px}.pr-svg.pr-oxygen .pr-oxygen__readhead .pr-svg-value{font-size:26px}.pr-svg.pr-oxygen .pr-oxygen__normal{font-size:12px}.pr-predict__actions{flex-direction:column;align-items:stretch}}.pr-answer-field__bound{font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--color-cyan-label,var(--color-water-2));font-size:.6rem;display:block}.pr-chain{gap:.85rem;display:grid}.pr-chain__chain{border:1px solid var(--pr-hairline,var(--color-line));background:color-mix(in srgb, var(--color-paper-3) 92%, transparent);flex-wrap:wrap;align-items:center;gap:.6rem;padding:1rem;display:flex;overflow-x:auto}.pr-chain__stage{align-items:center;gap:.6rem;padding-bottom:1.05rem;display:flex;position:relative}.pr-chain__times,.pr-chain__equals{font-family:var(--font-mono);color:var(--color-ink-muted);font-size:.95rem}.pr-chain__plate{border:1px solid var(--pr-hairline,var(--color-line));background:var(--pr-water-wash);font-family:var(--font-mono);font-variant-numeric:tabular-nums;align-items:baseline;gap:.3rem;padding:.55rem .75rem;display:inline-flex}.pr-chain__value{color:var(--color-ink);font-size:.95rem}.pr-chain__unit{font-family:var(--font-mono);color:var(--color-ink-soft);white-space:nowrap;font-size:.78rem;position:relative}.pr-chain__unit[data-cancelled]{color:var(--color-ink-muted)}.pr-chain__unit[data-cancelled]:after{border-top:2px solid var(--color-water);content:"";position:absolute;inset:42% -.12em auto;transform:rotate(-14deg)}.pr-chain__plate--product{background:0 0;border-style:dashed}.pr-chain__plate--product[data-resolved]{background:var(--pr-water-wash);border-style:solid}.pr-chain__plate--product .pr-chain__value{color:var(--color-cyan-label,var(--color-water-2))}.pr-chain__pending{font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;color:var(--color-ink-muted);font-size:.62rem}.pr-chain__slot{align-items:stretch;display:inline-flex}.pr-chain__slot[data-status=refuses] .pr-chain__card{border-color:var(--color-copper);box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--color-copper) 55%, transparent)}.pr-chain__slot[data-drop-active] .pr-chain__drop,.pr-chain__slot[data-drop-active] .pr-chain__card{border-color:var(--color-water)}.pr-chain__drop{border:1px dashed var(--pr-hairline,var(--color-line));min-width:7.2rem;min-height:3.6rem;color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;cursor:pointer;background:0 0;padding:.5rem .7rem;font-size:.62rem;transition:border-color .16s,color .16s}.pr-chain__drop:hover,.pr-chain__drop[data-ready]{border-color:var(--color-water);color:var(--color-ink-soft)}.pr-chain__drop:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-chain__card{border:1px solid var(--pr-hairline,var(--color-line));background:color-mix(in srgb, var(--color-paper-3) 94%, transparent);min-height:3.6rem;color:var(--color-ink);cursor:grab;text-align:left;align-content:center;gap:.3rem;padding:.5rem .7rem;transition:border-color .16s,box-shadow .16s;display:grid;position:relative}.pr-chain__card:hover{border-color:var(--color-water)}.pr-chain__card:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-chain__card[aria-pressed=true]{border-color:var(--color-water);box-shadow:inset 0 0 0 1px var(--color-water)}.pr-chain__card--bank{cursor:grab;padding-right:1rem}.pr-chain__card--bank small{font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;color:var(--color-ink-muted);font-size:.58rem}.pr-chain__frac{font-family:var(--font-mono);font-variant-numeric:tabular-nums;justify-items:center;gap:.18rem;font-size:.82rem;display:grid}.pr-chain__frac-rule{border-top:1px solid var(--color-ink-soft);width:100%}.pr-chain__flip{border:1px solid var(--pr-hairline,var(--color-line));color:var(--color-ink-soft);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;cursor:pointer;background:0 0;border-left:none;padding:0 .55rem;font-size:.6rem;transition:color .16s,border-color .16s}.pr-chain__flip:hover{color:var(--color-ink);border-color:var(--color-water)}.pr-chain__flip:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-chain__running{font-family:var(--font-mono);white-space:nowrap;color:var(--color-cyan-label,var(--color-water-2));font-variant-numeric:tabular-nums;font-size:.64rem;position:absolute;bottom:0;left:1.4rem}.pr-chain__refusal{font-family:var(--font-mono);white-space:nowrap;color:var(--color-copper);font-size:.64rem;position:absolute;bottom:0;left:1.4rem}.pr-chain__status{font-family:var(--font-mono);letter-spacing:.03em;color:var(--color-ink-soft);font-size:.72rem}.pr-chain[data-resolved] .pr-chain__status{color:var(--color-cyan-label,var(--color-water-2))}.pr-chain__bank{border-top:1px solid var(--pr-hairline,var(--color-line));flex-wrap:wrap;align-items:stretch;gap:.6rem;padding-top:.85rem;display:flex}.pr-chain__bank-label{font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--color-ink-muted);align-self:center;font-size:.62rem}.pr-chain__bank-empty{font-family:var(--font-mono);color:var(--color-ink-muted);align-self:center;font-size:.66rem}.pr-chain__actions{gap:1rem;display:flex}.pr-chain__insight{font-family:var(--font-serif-body);color:var(--color-ink-soft);border-left:2px solid var(--color-gold,var(--color-line));padding-left:.85rem;font-size:.9rem;line-height:1.5}@media (max-width:640px){.pr-chain__chain{flex-direction:column;align-items:flex-start}.pr-chain__stage{padding-bottom:1.15rem}}.pr-ladder__rail,.pr-ladder__tick{stroke:var(--pr-hairline,var(--color-line))}.pr-ladder__needle{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:1.6px}.pr-ladder__needle-head{fill:var(--color-cyan-label,var(--color-water-2))}.pr-ladder__pin{stroke:var(--color-ink-soft);stroke-dasharray:3 3}.pr-ladder__tower-frame{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-ladder__tower-grid{stroke:var(--pr-hairline,var(--color-line));opacity:.5}.pr-ladder__fill--hydrogen{fill:var(--color-flame);opacity:.85}.pr-ladder__fill--hydroxide{fill:var(--color-water);opacity:.6}.pr-ladder__dot--hydrogen{fill:var(--color-flame)}.pr-ladder__dot--hydroxide{fill:var(--color-water)}.pr-cliff__axis{stroke:var(--pr-hairline,var(--color-line))}.pr-cliff__curve{fill:none;stroke:var(--color-flame);stroke-width:2px}.pr-cliff__curve--compare{stroke-dasharray:4 4;opacity:.55}.pr-cliff__target{stroke:var(--color-cyan-label,var(--color-water-2));stroke-dasharray:3 3}.pr-cliff__marker{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:1.6px}.pr-cliff__marker-dot{fill:var(--color-cyan-label,var(--color-water-2))}.pr-cliff__eq{fill:var(--color-gold,var(--color-line))}.pr-spec__rail,.pr-spec__tick{stroke:var(--pr-hairline,var(--color-line))}.pr-spec__half{stroke:var(--color-gold,var(--color-line));stroke-width:2px}.pr-spec__needle{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:1.6px}.pr-spec__needle-head{fill:var(--color-cyan-label,var(--color-water-2))}.pr-spec__bar-frame{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-spec__bar-end{stroke:var(--color-ink-soft)}.pr-spec__seg--hydroxide{fill:var(--color-cyan-label,var(--color-water-2));opacity:.85}.pr-spec__seg--carbonate{fill:var(--color-flame);opacity:.85}.pr-spec__seg--bicarbonate{fill:var(--color-water);opacity:.45}.pr-solv__vessel{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-width:1.5px}.pr-solv__water{fill:var(--color-water);opacity:.28}.pr-solv__salt-dot{fill:var(--color-flame)}.pr-solv__hopper{fill:none;stroke:var(--color-flame)}.pr-solv__meter-face{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-solv__meter-value{font-family:var(--font-mono);fill:var(--color-cyan-label,var(--color-water-2));font-variant-numeric:tabular-nums;font-size:30px}.pr-solv__cell rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-solv__cell--misread rect{stroke:var(--color-flame)}.pr-solv__cell--misread .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}.pr-solv__cell--true rect{stroke:var(--color-cyan-label,var(--color-water-2))}.pr-coupon__readhead .pr-svg-value,.pr-larson__readhead .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:20px}.pr-coupon__rack line{stroke:var(--pr-hairline,var(--color-line));stroke-width:1.5px}.pr-coupon__rack polygon{fill:var(--color-water);opacity:.5}.pr-coupon__rack rect{fill:var(--color-paper-3);stroke:var(--pr-hairline,var(--color-line))}.pr-coupon__rack .pr-coupon__strip{fill:var(--color-flame);opacity:.75;stroke:none}.pr-coupon__slot rect{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-coupon__slot[data-resolved] rect{stroke:var(--color-cyan-label,var(--color-water-2));stroke-dasharray:none}.pr-coupon__slot text:first-of-type{fill:var(--color-cyan-label,var(--color-water-2));letter-spacing:.12em;font-size:9px}.pr-coupon__slot:not([data-resolved]) .pr-svg-value{fill:var(--color-ink-muted)}.pr-coupon__bar{stroke:var(--color-ink-soft);stroke-width:1.6px}.pr-coupon__result rect{fill:var(--color-paper-3);stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-coupon__result[data-resolved] rect{stroke:var(--color-cyan-label,var(--color-water-2));stroke-dasharray:none}.pr-coupon__result .pr-svg-value{font-size:20px}.pr-probe{grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:.75rem;display:grid}.pr-cell__bath rect{fill:color-mix(in srgb, var(--color-water) 10%, transparent);stroke:var(--color-water-3)}.pr-cell__bath[data-on=false] rect{fill:none;stroke:var(--color-line);stroke-dasharray:5 5}.pr-cell__metal path{fill:none;stroke:var(--color-gold);stroke-width:3px}.pr-cell__metal[data-on=false] path{stroke:var(--color-line);stroke-dasharray:4 6}.pr-cell__gap path{stroke:var(--color-paper);stroke-width:7px}.pr-cell__site rect{fill:var(--color-paper-2);stroke:var(--color-gold-soft)}.pr-cell__site--anode[data-on=true] rect{fill:color-mix(in srgb, var(--color-flame) 34%, var(--color-paper-2));stroke:var(--color-flame)}.pr-cell__site--cathode[data-on=true] rect{fill:color-mix(in srgb, var(--color-water) 24%, var(--color-paper-2));stroke:var(--color-water-2)}.pr-cell__site[data-on=false] rect{fill:none;stroke:var(--color-line);stroke-dasharray:4 4}.pr-cell__current path{fill:none;stroke:var(--color-line);stroke-width:2px}.pr-cell__current[data-running] .pr-cell__electrons{stroke:var(--color-gold)}.pr-cell__current[data-running] .pr-cell__ions{stroke:var(--color-water)}.pr-cell__current text{fill:var(--color-ink-muted)}.pr-cell__current[data-running] text{fill:var(--color-ink)}.pr-cell__air path{fill:none;stroke:var(--color-water-2);stroke-width:2px;stroke-dasharray:3 4}.pr-cell__air-note{fill:var(--color-ink-muted);font-family:var(--font-sans);font-size:11px}.pr-cell__readout .pr-svg-value,.pr-svg[data-running] .pr-cell__readout .pr-svg-value{fill:var(--color-flame-bright)}.pr-cell__verdict{color:var(--color-ink);font-family:var(--font-serif-body);margin:.75rem 0 0;font-size:.9rem;line-height:1.55}.pr-paradox__frame path{fill:none;stroke:var(--color-line)}.pr-paradox__zone rect{fill:color-mix(in srgb, var(--color-flame) 8%, transparent)}.pr-paradox__oxygen{fill:none;stroke:var(--color-water);stroke-width:2.5px}.pr-paradox__rate{fill:none;stroke:var(--color-flame);stroke-width:2.5px}.pr-paradox__key--oxygen{fill:var(--color-water)}.pr-paradox__key--rate{fill:var(--color-flame-bright)}.pr-paradox__cursor path{stroke:var(--color-gold-soft);stroke-dasharray:3 4}.pr-paradox__cursor[data-at-target] path{stroke:var(--color-gold);stroke-dasharray:none}.pr-paradox__dot--oxygen{fill:var(--color-water)}.pr-paradox__dot--rate,.pr-paradox__readout .pr-svg-value{fill:var(--color-flame-bright)}.pr-toggles{border:0;gap:.5rem;margin:0;padding:0;display:grid}.pr-toggles__item{border:1px solid var(--pr-hairline,var(--color-line));cursor:pointer;border-radius:6px;grid-template-columns:auto 1fr;align-items:baseline;gap:.15rem .65rem;padding:.7rem .85rem;display:grid}.pr-toggles__item input{width:1.05rem;height:1.05rem;accent-color:var(--color-water);grid-row:span 2}.pr-toggles__label{color:var(--color-ink);font-family:var(--font-serif-body);font-size:.9rem}.pr-toggles__detail{color:var(--color-ink-muted);font-family:var(--font-sans);font-size:.76rem;line-height:1.45}.pr-toggles__item[data-on=false]{border-color:color-mix(in srgb, var(--color-flame) 45%, var(--color-line));background:color-mix(in srgb, var(--color-flame) 7%, transparent)}.pr-toggles__item[data-on=false] .pr-toggles__label{color:var(--color-ink-muted);text-decoration:line-through}.pr-toggles__item:focus-within{outline:2px solid var(--color-water);outline-offset:2px}.pr-hotspot__hit{fill:#0000;cursor:pointer}.pr-hotspot__hit:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-hotspot__halo{fill:color-mix(in srgb, var(--color-water) 18%, transparent);opacity:0;transition:opacity .16s ease-out}.pr-hotspot__hit:hover+.pr-hotspot__halo,.pr-hotspot[data-read] .pr-hotspot__halo{opacity:1}.pr-hotspot__dot{fill:var(--color-paper-2);stroke:var(--color-water-2);stroke-width:1.5px}.pr-hotspot[data-read] .pr-hotspot__dot{fill:color-mix(in srgb, var(--color-water) 30%, var(--color-paper-2));stroke:var(--color-water)}.pr-hotspot__index{fill:var(--color-cyan-metadata,var(--color-water-2));font-family:var(--font-mono);letter-spacing:.08em;font-size:9px}.pr-hotspot__reading{fill:var(--color-ink);font-family:var(--font-mono);text-anchor:middle;font-size:11px}@media (prefers-reduced-motion:reduce){.pr-hotspot__halo{transition:none}}.pr-probe-point{border:1px solid var(--pr-hairline,var(--color-line));background:color-mix(in srgb, var(--color-paper-3) 55%, transparent);border-radius:6px}.pr-probe-point[data-read]{border-color:color-mix(in srgb, var(--color-water) 45%, var(--color-line))}.pr-probe-point button{cursor:pointer;text-align:left;background:0 0;border:0;align-items:center;gap:.65rem;width:100%;padding:.65rem .85rem;display:flex}.pr-probe-point__index{font-family:var(--font-mono);letter-spacing:.12em;color:var(--color-cyan-metadata,var(--color-water-2));font-size:.66rem}.pr-probe-point__label{font-family:var(--font-serif-body);color:var(--color-ink);flex:1;font-size:.88rem}.pr-probe-point__state{font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--color-water-2);border:1px solid;border-radius:999px;padding:.15rem .55rem;font-size:.6rem}.pr-probe-point[data-read] .pr-probe-point__state{color:var(--color-ink-muted)}.pr-probe-point__reading{padding:0 .85rem .75rem}.pr-probe-point__reading strong{font-family:var(--font-mono);letter-spacing:.04em;color:var(--color-cyan-numeric,var(--color-water));font-variant-numeric:tabular-nums;font-size:.85rem}.pr-probe-point__reading p{font-family:var(--font-serif-body);color:var(--color-ink-muted);margin:.35rem 0 0;font-size:.8rem;line-height:1.5}.pr-probe-verdict-lock{border:1px dashed var(--pr-hairline,var(--color-line));border-radius:6px;gap:.4rem;padding:1rem 1.2rem;display:grid}.pr-probe-verdict-lock p{font-family:var(--font-serif-body);color:var(--color-ink-muted);margin:0;font-size:.88rem}.pr-workbench__attempt>.pr-checkpoint,.pr-workbench__attempt>.pr-probe-verdict-lock{margin-bottom:1.5rem}.pr-larson__cell rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-larson__cell--aggressive rect{stroke:color-mix(in srgb, var(--color-flame) 55%, var(--color-line))}.pr-larson__cell--aggressive .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}.pr-larson__cell--shield rect{stroke:var(--color-cyan-label,var(--color-water-2))}.pr-larson__bar--aggressive{fill:var(--color-flame);opacity:.85}.pr-larson__bar--shield{fill:var(--color-water);opacity:.55}.pr-larson__band{stroke:none}.pr-larson__band--low{fill:var(--color-water);opacity:.16}.pr-larson__band--potential{fill:var(--color-flame);opacity:.16}.pr-larson__band--high{fill:var(--color-flame);opacity:.38}.pr-larson__needle{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:2px}.pr-larson__authored-target{stroke:var(--color-flame);stroke-dasharray:4 4;stroke-width:1.5px}.pr-svg .pr-larson__authored-target-label{fill:var(--color-flame-bright,var(--color-flame));font-family:var(--font-mono);letter-spacing:.06em;font-size:9px}.pr-sat__readhead .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:20px}.pr-sat__gauge rect,.pr-sat__cell rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-sat__gauge--target rect,.pr-sat__cell--held rect{stroke:var(--color-ink-soft)}.pr-sat__times{fill:var(--color-cyan-numeric,var(--color-water));font-size:16px}.pr-sat__bar--implied{fill:var(--color-water);opacity:.55}.pr-sat__bar--measured{fill:none;stroke:var(--color-ink-soft);stroke-width:1.4px}.pr-sat__match-line{stroke:var(--color-ink-muted);stroke-dasharray:3 3}.pr-sat__rail line:first-of-type{stroke:var(--pr-hairline,var(--color-line))}.pr-sat__landmark{stroke:var(--color-ink-soft);stroke-dasharray:4 4;stroke-width:1.5px}.pr-sat__marker{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:2px}.pr-sat__authored-target{stroke:var(--color-flame);stroke-dasharray:4 4;stroke-width:1.5px}.pr-svg .pr-sat__authored-target-label{fill:var(--color-flame-bright,var(--color-flame));font-family:var(--font-mono);letter-spacing:.06em;font-size:9px}.pr-sat__gap--deposit{fill:var(--color-flame);opacity:.45}.pr-sat__gap--dissolve{fill:var(--color-water);opacity:.35}.pr-sat__band{stroke:none}.pr-sat__band--forming{fill:var(--color-flame);opacity:.38}.pr-sat__band--borderline{fill:var(--color-water);opacity:.14}.pr-sat__band--dissolving{fill:var(--color-flame);opacity:.16}.pr-sat__needle{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:2px}.pr-side__readhead .pr-svg-value,.pr-approach__readhead .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:20px}.pr-side__basin{fill:color-mix(in srgb, var(--color-water) 14%, transparent);stroke:var(--pr-hairline,var(--color-line))}.pr-side__recirc{stroke:var(--color-water);stroke-width:3px;opacity:.6}.pr-side__branch{fill:none;stroke:var(--color-water);stroke-linecap:round}.pr-side__filter{fill:var(--color-paper-3);stroke:var(--color-flame)}.pr-side__clock line:first-of-type,.pr-approach__payback>line:first-of-type{stroke:var(--pr-hairline,var(--color-line))}.pr-side__target,.pr-approach__season{stroke:var(--color-gold,var(--color-line));stroke-width:2px}.pr-side__needle,.pr-approach__needle{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:2px}.pr-side__band{fill:var(--color-water);opacity:.16}.pr-approach__thermo>rect:first-of-type{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-approach__mercury{fill:var(--color-flame)}.pr-approach__cell rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-approach__cell--fixed rect{stroke:var(--color-gold,var(--color-line))}.pr-approach__cell--penalty rect{stroke:color-mix(in srgb, var(--color-flame) 55%, var(--color-line))}.pr-approach__cell--penalty .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}.pr-boiler__readhead .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:20px}.pr-boiler__cell rect,.pr-boiler__pin rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-boiler__cell--demand rect{stroke:color-mix(in srgb, var(--color-flame) 55%, var(--color-line))}.pr-boiler__cell--demand .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}.pr-boiler__cell--fixed rect,.pr-boiler__pin--clean rect{stroke:var(--color-gold,var(--color-line))}.pr-boiler__pin--failed rect{stroke:color-mix(in srgb, var(--color-flame) 55%, var(--color-line))}.pr-boiler__pin[data-active] rect{stroke-width:2.4px}.pr-boiler__stack-frame{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-boiler__stack--demand{fill:var(--color-flame);opacity:.85}.pr-boiler__stack--carry,.pr-boiler__product-fill{fill:var(--color-water);opacity:.55}.pr-boiler__grab-frame{fill:none;stroke:var(--color-gold,var(--color-line));stroke-width:1.4px}.pr-boiler__ceiling{stroke:var(--color-gold,var(--color-line));stroke-width:2px;stroke-dasharray:3 3}.pr-boiler__stream--condensate{fill:var(--color-water);opacity:.75}.pr-boiler__stream--makeup{fill:var(--color-water);opacity:.22}.pr-boiler__blend>line:first-of-type{stroke:var(--pr-hairline,var(--color-line))}.pr-boiler__needle{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:2px}.pr-boiler__fuel-cost{fill:var(--color-flame-bright,var(--color-flame));font-size:20px}.pr-ledger__readhead .pr-svg-value,.pr-audit__readhead .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:20px}.pr-ledger__tower path{fill:color-mix(in srgb, var(--color-water) 10%, transparent);stroke:var(--pr-hairline,var(--color-line));stroke-width:1.5px}.pr-ledger__stream line{stroke:var(--color-water);stroke-width:3px;opacity:.65}.pr-ledger__stream polygon{fill:var(--color-water);opacity:.65}.pr-ledger__stream--evaporation line{stroke-dasharray:6 6}.pr-ledger__cargo{fill:var(--color-flame-bright,var(--color-flame));letter-spacing:.1em;font-size:11px}.pr-ledger__cargo--pure{fill:var(--color-cyan-label,var(--color-water-2));letter-spacing:.1em;font-size:11px}.pr-predict__choices{gap:.5rem;display:grid}.pr-predict__choices button{border:1px solid var(--pr-hairline,var(--color-line));color:var(--color-ink);cursor:pointer;font-family:var(--font-serif-body);text-align:left;background:0 0;border-radius:6px;padding:.6rem .85rem;font-size:.88rem}.pr-predict__choices button[aria-pressed=true]{border-color:var(--color-water);background:var(--pr-water-wash,transparent)}.pr-predict__choices button:disabled{cursor:default;opacity:.75}.pr-predict__choices button:focus-visible{outline:2px solid var(--color-water);outline-offset:3px}.pr-audit__cell rect{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-audit__cell[data-resolved] rect{stroke-dasharray:none}.pr-audit__cell--chloride[data-resolved] rect{stroke:var(--color-cyan-label,var(--color-water-2))}.pr-audit__cell--calcium[data-resolved] rect{stroke:color-mix(in srgb, var(--color-flame) 55%, var(--color-line))}.pr-audit__cell--calcium[data-resolved] .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}.pr-audit__rail>line:first-of-type{stroke:var(--pr-hairline,var(--color-line))}.pr-audit__gap{fill:var(--color-flame);opacity:.3}.pr-audit__needle--chloride{stroke:var(--color-cyan-label,var(--color-water-2));stroke-width:2px}.pr-audit__needle--calcium{stroke:var(--color-flame-bright,var(--color-flame));stroke-width:2px}.pr-problem-head__brief{max-width:46rem;color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.04em;margin:.65rem 0 0;font-size:.7rem;line-height:1.55}.pr-term{border:0;border-bottom:1px dotted var(--color-water-2);color:inherit;font:inherit;letter-spacing:inherit;cursor:help;background:0 0;padding:0 .08rem;display:inline;position:relative}.pr-term:before{content:"";position:absolute;inset:-.75rem -.2rem}.pr-term:hover,.pr-term[aria-expanded=true]{color:var(--color-cyan-label);border-bottom-style:solid}.pr-term:focus-visible{outline:2px solid var(--color-water);outline-offset:3px;border-radius:2px}.pr-term-note{border:1px solid var(--color-line);background:var(--color-paper-3);color:var(--color-ink-soft);flex-wrap:wrap;gap:.3rem .65rem;margin-top:.75rem;padding:.65rem .75rem;line-height:1.55;display:flex}.pr-term-note strong{color:var(--color-cyan-label);flex-basis:100%;font-weight:500}.pr-term-note__actions{flex-basis:100%;align-items:center;gap:.8rem;display:inline-flex}.pr-term-note__actions a,.pr-term-note__actions button{min-height:44px;color:var(--color-cyan-label);font:inherit;cursor:pointer;background:0 0;border:0;align-items:center;display:inline-flex}.pr-answer--activity{justify-content:space-between;align-items:end;gap:1.5rem;display:flex}.pr-answer--activity .pr-answer__head{max-width:39rem}.pr-activity-reflection{border:1px solid var(--pr-hairline,var(--color-line));background:color-mix(in srgb, var(--color-paper-2) 88%, transparent);margin:0 clamp(1rem,2vw,1.75rem) clamp(1rem,2vw,1.75rem)}.pr-activity-reflection summary{cursor:pointer;justify-content:space-between;align-items:center;gap:1rem;min-height:4.5rem;padding:.9rem 1.1rem;display:flex}.pr-activity-reflection summary::marker{color:var(--color-water)}.pr-activity-reflection summary>span{color:var(--color-ink);font-family:var(--font-serif-body);font-size:1rem}.pr-activity-reflection summary small{color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:.62rem}.pr-activity-reflection__body{border-top:1px solid var(--pr-hairline,var(--color-line));gap:1rem;padding:1.1rem;display:grid}.pr-activity-reflection__body>p,.pr-activity-reflection__body ul{color:var(--color-ink-soft);font-family:var(--font-serif-body);margin:0;line-height:1.6}.pr-activity-reflection textarea{resize:vertical;border:1px solid var(--pr-hairline,var(--color-line));background:var(--color-paper);width:100%;min-height:8rem;color:var(--color-ink);font:inherit;padding:.85rem;line-height:1.55}.pr-activity-reflection__body ul{gap:.4rem;padding-left:1.2rem;display:grid}.pr-molecular-bench__plate>rect{fill:color-mix(in srgb, var(--color-paper-2) 80%, transparent);stroke:color-mix(in srgb, var(--color-gold) 54%, var(--color-line));stroke-width:1px}.pr-molecular-bench__plate>text:last-child{fill:var(--color-accent-ink,var(--color-gold))}.pr-molecular-controls{padding-inline:clamp(.15rem,1.2vw,.75rem)}.pr-molecular-choice-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:.55rem;display:grid}.pr-molecular-choice-grid button,.pr-routing-board button,.pr-network-controls button{border:1px solid var(--pr-hairline,var(--color-line));min-height:2.75rem;color:var(--color-ink);cursor:pointer;font-family:var(--font-serif-body);text-align:left;background:0 0;border-radius:5px;padding:.7rem .8rem;font-size:.85rem;line-height:1.25}.pr-molecular-choice-grid button:hover,.pr-molecular-choice-grid button[aria-pressed=true],.pr-routing-board button:hover,.pr-routing-board button[aria-pressed=true],.pr-network-controls button:hover,.pr-network-controls button[aria-pressed=true]{border-color:var(--color-water);background:var(--pr-water-wash,transparent)}.pr-molecular-choice-grid button[aria-pressed=true],.pr-network-controls button[aria-pressed=true]{box-shadow:inset 3px 0 0 var(--color-water)}.pr-molecular-choice-grid button:disabled,.pr-routing-board button:disabled{cursor:default;opacity:.45}.pr-energy-plot__axis{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-width:1.2px}.pr-energy-plot__curve{fill:none;stroke:var(--color-water);stroke-width:2.5px}.pr-energy-plot__marker-line{stroke:var(--color-cyan-label,var(--color-water-2));stroke-dasharray:4 5;stroke-width:1.2px}.pr-energy-plot__marker,.pr-electron-dot{fill:var(--color-cyan-numeric,var(--color-water));stroke:var(--color-paper);stroke-width:2px}.pr-energy-atoms>circle{fill:var(--color-paper-3);stroke:var(--color-water);stroke-width:1.5px}.pr-energy-atoms__cloud{fill:color-mix(in srgb, var(--color-water) 10%, transparent);stroke:color-mix(in srgb, var(--color-water) 40%, transparent);stroke-dasharray:3 4}.pr-energy-atoms__shared{fill:color-mix(in srgb, var(--color-water) 16%, transparent);stroke:var(--color-water);stroke-width:1.5px}.pr-electron-routing__panel>rect,.pr-polarity-bench__panel>rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-electron-routing__panel>circle,.pr-polarity-bench__panel>circle{fill:var(--color-paper-3);stroke:var(--color-water-2);stroke-width:1.4px}.pr-electron-routing__panel>path,.pr-electron-routing__panel>line,.pr-polarity-bench__panel>line{fill:none;stroke:var(--color-water-2);stroke-width:1.5px}.pr-electron-routing__bridge{fill:color-mix(in srgb, var(--color-water) 15%, transparent);stroke:var(--color-water);stroke-dasharray:4 3}.pr-routing-board{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.pr-routing-board__bank,.pr-routing-board__slots{align-content:start;gap:.5rem;display:grid}.pr-routing-board button{gap:.2rem;display:grid}.pr-routing-board button small,.pr-network-controls button small{color:var(--color-ink-muted);font-family:var(--font-mono);letter-spacing:.03em;font-size:.62rem;font-weight:400}.pr-routing-board__slots button[data-filled=true]{border-color:color-mix(in srgb, var(--color-water) 65%, var(--color-line))}.pr-routing-board__slots button[data-result=correct]{background:var(--pr-water-wash,transparent);box-shadow:inset 3px 0 0 var(--color-water)}.pr-routing-board__slots button[data-result=incorrect]{border-style:dashed;border-color:var(--color-flame,var(--color-line))}.pr-polarity-bench__dipole{stroke:var(--color-water)!important;stroke-width:2px!important}.pr-polarity-bench__resultant{stroke:var(--color-cyan-numeric,var(--color-water))!important;stroke-width:4px!important}.pr-polarity-bench marker path{fill:var(--color-water);stroke:none}.pr-network-bench__central>line,.pr-network-bench__legend>line:first-child{stroke:var(--color-water-2);stroke-width:2.5px}.pr-network-bench__central>circle{fill:var(--color-paper-3);stroke:var(--color-water-2);stroke-width:1.5px}.pr-network-bench__ports circle{fill:#0000;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:4 5}.pr-network-bench__ports [data-connected=true] circle{fill:color-mix(in srgb, var(--color-water) 10%, transparent);stroke:var(--color-water);stroke-dasharray:none}.pr-network-bench__link{fill:none;stroke:var(--color-water);stroke-dasharray:3 7;stroke-linecap:round;stroke-width:2px}.pr-network-bench__ports [data-connected=false] .pr-network-bench__link{opacity:.18}.pr-network-controls{grid-template-columns:repeat(4,minmax(0,1fr));gap:.55rem;display:grid}.pr-network-controls button{gap:.25rem;display:grid}.pr-carbonate-lattice__unit circle,.pr-carbonate-lattice__ions circle,.pr-carbonate-lattice__repeat circle,.pr-valence-ion__atom circle,.pr-water-geometry__molecule circle{fill:var(--color-paper-3);stroke:var(--color-water-2);stroke-width:1.5px}.pr-carbonate-lattice__unit line,.pr-water-geometry__molecule line{stroke:var(--color-water-2);stroke-width:2.5px}.pr-carbonate-lattice__ions path{fill:none;opacity:.2;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:4 6;stroke-width:2px}.pr-carbonate-lattice__ions path[data-active=true]{opacity:1;stroke:var(--color-water)}.pr-carbonate-lattice__internal path{fill:none;opacity:.2;stroke:var(--pr-hairline,var(--color-line));stroke-width:7px}.pr-carbonate-lattice__internal[data-active=true] path{opacity:1;stroke:var(--color-cyan-numeric,var(--color-water))}.pr-carbonate-lattice__repeat circle{fill:color-mix(in srgb, var(--color-water) 8%, var(--color-paper-3))}.pr-carbonate-lattice__repeat path{fill:none;stroke:var(--color-water);stroke-dasharray:3 5;stroke-width:1.5px}.pr-valence-ion__atom>rect,.pr-water-geometry__chain rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-valence-ion__atom .pr-valence-ion__shell{fill:none;opacity:.7;stroke-dasharray:3 5}.pr-valence-ion__charge .pr-svg-value{fill:var(--color-cyan-numeric,var(--color-water));font-size:1.5rem}.pr-ion-controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem;display:grid}.pr-ion-controls section{border:1px solid var(--pr-hairline,var(--color-line));border-radius:5px;justify-content:space-between;align-items:center;gap:.8rem;padding:.8rem;display:flex}.pr-ion-controls section>div:first-child{gap:.18rem;display:grid}.pr-ion-controls section>div:last-child{gap:.45rem;display:flex}.pr-ion-controls button,.pr-water-geometry__controls button{border:1px solid var(--pr-hairline,var(--color-line));color:var(--color-ink);cursor:pointer;font:inherit;background:0 0;border-radius:4px;min-height:2.55rem;padding:.55rem .7rem}.pr-ion-controls button:hover:not(:disabled),.pr-water-geometry__controls button:hover,.pr-water-geometry__controls button[aria-pressed=true]{background:var(--pr-water-wash,transparent);border-color:var(--color-water)}.pr-ion-controls button:disabled{cursor:default;opacity:.35}.pr-ion-controls small{color:var(--color-ink-muted);font-family:var(--font-mono);font-size:.65rem}.pr-water-geometry__pair circle{fill:var(--color-cyan-numeric,var(--color-water))}.pr-water-geometry__field line{stroke:var(--color-cyan-numeric,var(--color-water));stroke-width:3px}.pr-water-geometry__field marker path,.pr-water-geometry marker path{fill:var(--color-cyan-numeric,var(--color-water));stroke:none}.pr-water-geometry__chain path{fill:none;stroke:var(--color-water);stroke-width:1.5px}.pr-water-geometry__controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem;display:grid}.pr-water-geometry__controls>div{border:1px solid var(--pr-hairline,var(--color-line));border-radius:5px;grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem;padding:.7rem;display:grid}.pr-water-geometry__controls .pr-kicker{grid-column:1/-1}.pr-water-geometry__controls button[aria-pressed=true]{box-shadow:inset 3px 0 0 var(--color-water)}.pr-molar-mass__plate>rect,.pr-molar-mass__ledger rect{fill:color-mix(in srgb, var(--color-paper-2) 78%, transparent);stroke:var(--pr-hairline,var(--color-line))}.pr-molar-mass__plate>rect{stroke:color-mix(in srgb, var(--color-gold) 54%, var(--color-line))}.pr-molar-mass__formula .pr-svg-value{font-size:2.15rem}.pr-molar-mass__ledger+line{stroke:var(--color-water)}.pr-molar-mass__controls,.pr-molar-mass__rail,.pr-molar-mass__locked{margin-inline:clamp(.15rem,1.2vw,.75rem)}.pr-molar-mass__controls{gap:.8rem;display:grid}.pr-molar-mass__elements{grid-template-columns:repeat(3,minmax(0,1fr));gap:.55rem;display:grid}.pr-molar-mass__elements section{border:1px solid var(--pr-hairline,var(--color-line));border-radius:5px;justify-content:space-between;align-items:center;gap:.75rem;padding:.7rem;display:flex}.pr-molar-mass__elements section>div:first-child{display:grid}.pr-molar-mass__elements strong{color:var(--color-cyan-numeric,var(--color-water));font-family:var(--font-display);font-size:1.15rem}.pr-molar-mass__elements span,.pr-molar-mass__elements small{color:var(--color-ink-muted);font-size:.68rem}.pr-molar-mass__elements small{font-family:var(--font-mono)}.pr-molar-mass__stepper{align-items:center;gap:.4rem;display:flex}.pr-molar-mass__stepper button{border:1px solid var(--pr-hairline,var(--color-line));color:var(--color-ink);cursor:pointer;font:inherit;background:0 0;border-radius:50%;justify-content:center;align-items:center;width:2rem;height:2rem;display:inline-flex}.pr-molar-mass__stepper button:hover:not(:disabled){background:var(--pr-water-wash,transparent);border-color:var(--color-water)}.pr-molar-mass__stepper button:disabled{cursor:default;opacity:.35}.pr-molar-mass__stepper output{color:var(--color-cyan-numeric,var(--color-water));font-family:var(--font-mono);text-align:center;min-width:1.4rem}.pr-molar-mass__rail,.pr-molar-mass__locked{border-top:1px solid var(--pr-hairline,var(--color-line));gap:.65rem;padding-top:1rem;display:grid}.pr-molar-mass__locked{color:var(--color-ink-muted);font-size:.78rem}@media (max-width:48rem){.pr-answer--activity{flex-direction:column;align-items:stretch}.pr-answer--activity .pr-primary-button{width:100%}.pr-molecular-choice-grid,.pr-routing-board,.pr-network-controls,.pr-molar-mass__elements,.pr-ion-controls,.pr-water-geometry__controls{grid-template-columns:1fr}.pr-ion-controls section{flex-direction:column;align-items:stretch}.pr-ion-controls section>div:last-child{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.pr-activity-reflection summary{flex-direction:column;align-items:flex-start}}@media (prefers-reduced-motion:reduce){.pr-molecular-bench *,.pr-molecular-controls *{scroll-behavior:auto;transition-duration:.01ms!important}}.pr-film__water{fill:color-mix(in srgb, var(--color-water) 14%, transparent);stroke:var(--pr-hairline,var(--color-line))}.pr-film__water[data-loaded]{fill:color-mix(in srgb, var(--color-flame) 22%, transparent)}.pr-film__matrix{fill:color-mix(in srgb, var(--color-line) 18%, transparent);stroke:var(--pr-hairline,var(--color-line));transition:y .32s,height .32s}.pr-film__metal{fill:color-mix(in srgb, var(--color-brass,var(--color-line)) 60%, transparent);stroke:var(--color-brass,var(--color-line))}.pr-film__killed{fill:color-mix(in srgb, var(--color-water) 26%, transparent);transition:height .26s}.pr-film__sheltered{fill:color-mix(in srgb, var(--color-flame) 16%, transparent);transition:y .26s,height .26s}.pr-film__front{stroke:var(--color-water-2);stroke-width:2px;transition:y1 .26s,y2 .26s}.pr-film__prediction{stroke:var(--color-flame-bright,var(--color-flame));stroke-width:2px;stroke-dasharray:6 5}.pr-film__curve{fill:none;stroke:var(--color-water-2);stroke-width:2px}.pr-film__probe{stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:4 4;transition:y1 .2s,y2 .2s}.pr-film__probe-dot{fill:var(--color-water);transition:cx .2s,cy .2s}.pr-film__anodic .pr-svg-label{fill:var(--color-flame-bright,var(--color-flame))}.pr-film__choices{flex-wrap:wrap;align-items:center;gap:.5rem;display:flex}.pr-microbe__frame line{stroke:var(--pr-hairline,var(--color-line))}.pr-microbe__curve{fill:none;stroke:var(--color-water-2);stroke-width:2px}.pr-microbe__curve--loss{stroke:var(--color-flame-bright,var(--color-flame));stroke-dasharray:6 4}.pr-microbe__reference{stroke:var(--color-brass,var(--color-line));stroke-dasharray:5 4}.pr-microbe__axis{stroke:var(--pr-hairline,var(--color-line))}.pr-microbe__drop{stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:4 4;transition:x1 .2s,x2 .2s}.pr-microbe__marker{fill:var(--color-water);transition:cx .2s,cy .2s}.pr-microbe__prediction{stroke:var(--color-flame-bright,var(--color-flame));stroke-width:2px;stroke-dasharray:6 5}.pr-microbe__clock{stroke:var(--color-water);stroke-width:3px;transition:x1 .2s,x2 .2s}.pr-microbe__split-hocl{fill:color-mix(in srgb, var(--color-water) 55%, transparent);transition:width .2s}.pr-microbe__split-ocl{fill:color-mix(in srgb, var(--color-flame) 30%, transparent);transition:width .2s,x .2s}.pr-microbe__stage rect{fill:none;stroke:var(--pr-hairline,var(--color-line))}.pr-microbe__stage[data-reached] rect{fill:var(--color-water);stroke:var(--color-water)}.pr-microbe__stage[data-reached] .pr-svg-value{fill:var(--color-water-2)}.pr-surface__boundary{stroke:var(--color-brass,var(--color-line));stroke-width:2px;stroke-dasharray:8 5}.pr-surface__station circle,.pr-surface__station rect{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-surface__station[data-read] circle,.pr-surface__station[data-read] rect{stroke-dasharray:none}.pr-surface__station--bulk[data-read] circle{fill:color-mix(in srgb, var(--color-water) 35%, transparent);stroke:var(--color-water-2)}.pr-surface__station--surface[data-read] rect{fill:color-mix(in srgb, var(--color-flame) 28%, transparent);stroke:var(--color-flame-bright,var(--color-flame))}.pr-surface__station--surface[data-read] .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}@media (prefers-reduced-motion:reduce){.pr-film__matrix,.pr-film__killed,.pr-film__sheltered,.pr-film__front,.pr-film__probe,.pr-film__probe-dot,.pr-microbe__drop,.pr-microbe__marker,.pr-microbe__clock,.pr-microbe__split-hocl,.pr-microbe__split-ocl{transition:none}}.pr-classify__buckets{grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:.75rem;display:grid}.pr-classify__bucket{border:1px solid var(--pr-hairline,var(--color-line));background:color-mix(in srgb, var(--color-water) 4%, transparent);border-radius:4px;flex-direction:column;gap:.5rem;padding:.75rem;transition:border-color .16s,background .16s;display:flex}.pr-classify__bucket[data-ready]{border-color:color-mix(in srgb, var(--color-water) 45%, var(--color-line))}.pr-classify__bucket[data-drop-active]{border-color:var(--color-water);background:color-mix(in srgb, var(--color-water) 12%, transparent)}.pr-classify__bucket-head{text-align:left;cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:baseline;gap:.5rem;width:100%;min-height:44px;padding:0;display:flex}.pr-classify__bucket-head:disabled{cursor:default}.pr-classify__bucket-head:focus-visible{outline:2px solid var(--color-water);outline-offset:3px}.pr-classify__bucket-label{color:var(--color-water-2);font-weight:600}.pr-classify__bucket-count{font-variant-numeric:tabular-nums;color:var(--color-water-2);opacity:.75}.pr-classify__bucket-hint{opacity:.72;margin:0;font-size:.82rem}.pr-classify__held{flex-direction:column;gap:.35rem;margin:0;padding:0;list-style:none;display:flex}.pr-classify__held-item{text-align:left;border:1px solid var(--pr-hairline,var(--color-line));background:color-mix(in srgb, var(--color-water) 8%, transparent);cursor:pointer;border-radius:3px;flex-direction:column;gap:.15rem;width:100%;min-height:44px;padding:.45rem .6rem;display:flex}.pr-classify__held-item:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-classify__held-item[aria-pressed=true]{border-color:var(--color-water)}.pr-classify__held-item[data-result=correct]{border-color:var(--color-water-2)}.pr-classify__held-item[data-result=incorrect]{border-color:var(--color-flame-bright,var(--color-flame))}.pr-classify__held-item[data-result=incorrect] small{color:var(--color-flame-bright,var(--color-flame))}.pr-classify__held-empty{opacity:.5;padding:.35rem 0;font-size:.8rem}@media (prefers-reduced-motion:reduce){.pr-classify__bucket{transition:none}}.pr-volume__boundary{fill:color-mix(in srgb, var(--color-water) 5%, transparent);stroke:var(--color-brass,var(--color-line));stroke-width:2px}.pr-volume__zone line{stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-volume__zone polygon{fill:var(--pr-hairline,var(--color-line))}.pr-volume__zone rect{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-volume__zone[data-filled] line,.pr-volume__zone[data-filled] rect{stroke:var(--color-water-2);stroke-dasharray:none}.pr-volume__zone[data-filled] polygon{fill:var(--color-water-2)}.pr-volume__zone[data-filled] rect{fill:color-mix(in srgb, var(--color-water) 12%, transparent)}.pr-volume__zone[data-filled] .pr-svg-value{fill:var(--color-water-2)}.pr-cascade__symptom rect{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:5 4}.pr-cascade__symptom[data-read] rect{stroke:var(--color-water-2);stroke-dasharray:none;fill:color-mix(in srgb, var(--color-water) 10%, transparent)}.pr-cascade__symptom[data-read] .pr-svg-value{fill:var(--color-water-2)}.pr-cascade__trace{stroke:color-mix(in srgb, var(--color-flame) 60%, var(--color-line));stroke-width:1.5px}.pr-cascade__cause rect{fill:none;stroke:var(--pr-hairline,var(--color-line));stroke-dasharray:6 5}.pr-cascade__cause[data-found] rect{stroke:var(--color-flame-bright,var(--color-flame));stroke-dasharray:none;fill:color-mix(in srgb, var(--color-flame) 14%, transparent)}.pr-cascade__cause[data-found] .pr-svg-value{fill:var(--color-flame-bright,var(--color-flame))}.pr-svg-handle__track{stroke:var(--pr-hairline,var(--color-line));stroke-width:3px;stroke-linecap:round}.pr-svg-handle__filled{stroke:color-mix(in srgb, var(--color-water) 55%, transparent);stroke-width:3px;stroke-linecap:round}.pr-svg-handle__thumb{fill:var(--color-water);stroke:var(--color-water-2);stroke-width:2px;pointer-events:none}.pr-svg-handle__label{fill:var(--color-water-2);letter-spacing:.08em;pointer-events:none;font-size:12px}.pr-svg-handle__grab{fill:#0000;cursor:grab;touch-action:none}.pr-svg-handle__grab:active{cursor:grabbing}.pr-svg-handle__grab:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-svg-handle[data-disabled] .pr-svg-handle__grab{cursor:default}@media (prefers-reduced-motion:reduce){.pr-inspect__ring{transition:none}}.pr-inspect{grid-template-columns:minmax(0,1fr);gap:.75rem;display:grid}.pr-inspect__field{min-width:0;position:relative}.pr-inspect__overlay{pointer-events:none;width:100%;height:100%;position:absolute;inset:0;overflow:visible}.pr-inspect__overlay .pr-inspect__hit{pointer-events:auto}@media (max-width:50rem){.pr-inspect__field{width:44rem}}.pr-tower-balance{height:auto;display:block}.pr-workbench .pr-inspect:not([data-open]) .pr-inspect__bay{display:none}.pr-inspect__bay{border:1px solid var(--color-line);background:var(--color-paper-3);border-radius:3px;flex-direction:column;gap:.15rem;min-height:11rem;padding:.85rem .9rem .9rem;display:flex}.pr-inspect__bay-head{border-bottom:1px solid var(--color-line);justify-content:space-between;align-items:center;padding-bottom:.5rem;display:flex}.pr-inspect__index{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:.62rem}.pr-inspect__bay-target{width:20px;height:20px;overflow:visible}.pr-inspect__label{color:var(--color-cyan-label);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;margin:.7rem 0 0;font-size:.78rem;font-weight:500}.pr-inspect__value{color:var(--color-cyan-numeric);font-family:var(--font-mono);margin:.25rem 0 0;font-size:1.5rem;line-height:1.1}.pr-inspect__detail{color:var(--color-ink-soft);font-family:var(--font-serif-body);margin:.6rem 0 0;font-size:.9rem;line-height:1.55}.pr-provenance{border-top:1px solid var(--color-line);margin-top:.7rem;padding-top:.65rem}.pr-provenance .pr-kicker{color:var(--color-cyan-metadata);font-size:.58rem}.pr-provenance p{color:var(--color-ink-soft);font-family:var(--font-mono);margin:.35rem 0 0;font-size:.76rem;line-height:1.55}.pr-provenance [data-source]{color:var(--color-cyan-numeric)}.pr-inspect__resting{color:var(--color-ink-faint);font-family:var(--font-mono);letter-spacing:.04em;margin:auto 0;font-size:.72rem;line-height:1.6}.pr-inspect__bay-foot{border-top:1px solid var(--color-line);justify-content:space-between;align-items:center;gap:.5rem;margin-top:auto;padding-top:.7rem;display:flex}.pr-inspect__link{color:var(--color-cyan-label);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;font-size:.68rem}.pr-inspect__close{min-height:44px;color:var(--color-ink-faint);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;cursor:pointer;background:0 0;border:none;padding:0 .25rem;font-size:.68rem}.pr-inspect__close:hover{color:var(--color-ink-soft)}@media (min-width:900px){.pr-workbench .pr-inspect:not([data-open]) .pr-inspect__bay{display:none}.pr-inspect__bay{grid-template-columns:minmax(9rem,15rem) minmax(0,1fr);align-items:start;column-gap:1.5rem;min-height:0;display:grid}.pr-inspect__bay-head,.pr-inspect__label,.pr-inspect__value{grid-column:1}.pr-inspect__detail{grid-area:1/2/span 3;margin-top:0}.pr-inspect__bay>.pr-provenance{grid-column:2}.pr-inspect__bay-foot{grid-column:1/-1}}.pr-inspect__close:focus-visible,.pr-inspect__link:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-inspect__ring{fill:none;stroke:var(--color-water-2);stroke-width:1.25px;opacity:.6;transition:opacity .16s,stroke-width .16s}.pr-inspect__pip{fill:var(--color-water);opacity:.75;transition:opacity .16s}.pr-inspect__ticks{stroke:var(--color-gold);stroke-width:1px;opacity:.5}.pr-inspect__hit{fill:#0000;cursor:pointer}.pr-inspect__hit:focus{outline:none}.pr-inspect__hit:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-inspect__target:hover .pr-inspect__ring,.pr-inspect__target[data-open] .pr-inspect__ring{opacity:1;stroke-width:2px}.pr-inspect__target:hover .pr-inspect__pip,.pr-inspect__target[data-open] .pr-inspect__pip{opacity:1}.pr-inspect__target[data-open] .pr-inspect__ticks{opacity:.95}.pr-inspect__leader path{stroke:var(--color-water-2);stroke-width:1.25px;stroke-dasharray:5 4}.pr-inspect__leader circle{fill:var(--color-water)}.pr-plate__outer,.pr-plate__inner{fill:none;stroke:var(--color-line)}.pr-plate__outer{stroke-width:1.25px}.pr-plate__inner{opacity:.55}.pr-plate__ruling line{stroke:var(--color-gold-soft);stroke-width:.75px;opacity:.55}.pr-plate__ruling line[data-major]{opacity:.9}.pr-plate__registration path{stroke:var(--color-gold);stroke-width:1px;opacity:.7}.pr-readout rect{fill:var(--color-paper-2);stroke:var(--color-line);stroke-width:1px}.pr-readout__leader{stroke:var(--color-line);stroke-width:1px}.pr-readout__label{fill:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.14em;font-size:12px}.pr-readout__value{fill:var(--color-cyan-numeric);font-family:var(--font-mono);font-size:21px}.pr-readout__unit{fill:var(--color-cyan-metadata);letter-spacing:.1em;font-size:12px}.pr-readout{cursor:pointer}.pr-readout:focus{outline:none}.pr-readout:hover rect,.pr-readout:focus-visible rect{stroke:var(--color-water-2);stroke-width:2px}.pr-tower__shell{fill:none;stroke:var(--color-ink-soft);stroke-width:2px;stroke-linejoin:round}.pr-tower__fill-lines{fill:none;stroke:var(--color-water-2);stroke-width:1px;opacity:.5}.pr-tower__basin{fill:var(--color-water-3);stroke:var(--color-water-2);stroke-width:1px}.pr-tower__valve circle{fill:var(--color-paper);stroke:var(--color-water-2);stroke-width:1.5px}.pr-tower__valve path{stroke:var(--color-water-2);stroke-width:1.5px}.pr-tower__rule{fill:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.16em;font-size:13px}.pr-recirculation__pump circle{fill:var(--color-paper-2);stroke:var(--color-water-2);stroke-width:1.5px}.pr-recirculation__pump path{fill:var(--color-water-2)}.pr-svg-handle__frame{fill:var(--color-paper-2);stroke:var(--color-gold-soft);stroke-width:1px}.pr-svg-handle__ruling line{stroke:var(--color-gold-soft);stroke-width:.75px}.pr-svg-handle__ruling line[data-major]{stroke:var(--color-gold)}.pr-svg-handle__readout{fill:var(--color-cyan-numeric);font-family:var(--font-mono);letter-spacing:.14em;font-size:16px}.pr-svg-handle__stepper path{fill:none;stroke:var(--color-water-2);stroke-width:1.5px}.pr-svg-handle__stepper[data-disabled] path{opacity:.3}.pr-svg-handle__stepper-hit{fill:#0000;cursor:pointer}.pr-svg-handle__stepper-hit:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-tower-balance .pr-tower>path{fill:none}.pr-tower-balance .pr-tower__shell{fill:none;stroke:var(--color-ink-soft);stroke-width:2px}.pr-tower-balance .pr-tower__fill-lines{stroke:var(--color-water-2);stroke-width:1px;opacity:.5}.pr-tower-balance .pr-tower__drift-eliminator{stroke:var(--color-gold-soft);stroke-width:2px}.pr-tower-balance .pr-tower__basin{fill:var(--color-water-3);stroke:var(--color-water-2);stroke-width:1px}.pr-tower-balance .pr-stream>path,.pr-tower-balance .pr-recirculation>path{fill:none;stroke:var(--color-water);stroke-width:2px}.pr-tower-balance .pr-stream--evaporation>path{stroke:var(--color-water-2);stroke-width:2.5px;opacity:.8}.pr-tower-balance .pr-tower__valve circle{fill:var(--color-paper);stroke:var(--color-water-2);stroke-width:1.5px}.pr-tower-balance .pr-tower__valve path{fill:none;stroke:var(--color-water-2);stroke-width:1.5px}.pr-tower-balance .pr-recirculation__pump circle{fill:var(--color-paper-2);stroke:var(--color-water-2);stroke-width:1.5px}.pr-tower-balance .pr-recirculation__pump path{fill:var(--color-water-2);stroke:none}.pr-tower-balance .pr-readout rect{fill:var(--color-paper-2);stroke:var(--color-line);stroke-width:1px}.pr-tower-balance .pr-readout__leader{fill:none;stroke:var(--color-line);stroke-width:1px}.pr-room .pr-room__layout{grid-template-columns:minmax(0,1fr);grid-auto-flow:row}.pr-room .pr-guide{border-left:none;border-top:1px solid var(--pr-hairline,var(--color-line));max-height:none;position:static;overflow:visible}.pr-room__route{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:.68rem}.pr-guide-row>summary{cursor:pointer;list-style:none}.pr-guide-row>summary::-webkit-details-marker{display:none}.pr-guide-row>summary:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-guide-row>summary:after{content:"+";float:right;color:var(--color-cyan-metadata);font-family:var(--font-mono)}.pr-guide-row[open]>summary:after{content:"−"}.pr-chapter--detail{width:min(100%,112rem);padding:.35rem clamp(1rem,3.5vw,3.5rem) 5rem}.pr-chapter--detail .pr-room__context{border-bottom:1px solid var(--color-gold-soft);justify-content:space-between;min-height:2.75rem;margin:0;padding:0 .25rem}.pr-chapter--detail .pr-room__context>*{align-items:center;min-height:44px;display:inline-flex}.pr-room .pr-room__layout{box-shadow:none;background:0 0;border:0;display:block}.pr-room .pr-workbench{background:0 0}.pr-room .pr-problem-head{min-height:0;padding:clamp(.35rem,.7vw,.55rem) .25rem .9rem}.pr-room .pr-problem-head__status{justify-content:flex-start;gap:2rem}.pr-room .pr-problem-head h1{max-width:50rem;color:var(--color-ink);font-family:var(--font-serif);letter-spacing:-.035em;white-space:pre-line;margin:.4rem 0 0;font-size:clamp(2rem,3.2vw,2.6rem);font-weight:400;line-height:1}.pr-room .pr-problem-head__brief{max-width:51rem;color:var(--color-ink-soft);font-family:var(--font-serif-body);margin:.55rem 0 0;font-size:clamp(1rem,1.6vw,1.18rem);line-height:1.5}@media (min-width:64rem){.pr-room .pr-problem-head{grid-template-columns:minmax(0,1.1fr) minmax(20rem,.9fr);align-items:end;column-gap:clamp(2rem,4vw,4rem);display:grid}.pr-room .pr-problem-head>.bp-route-context{grid-column:1/-1}.pr-room .pr-problem-head__status,.pr-room .pr-problem-head h1{grid-column:1}.pr-room .pr-problem-head__brief{grid-area:2/2/span 2;align-self:end;margin:0 0 .2rem}}.pr-room .pr-problem-head__meta{color:var(--color-ink-muted)}.pr-room .pr-guide{background:0 0;border:0;grid-column:1;width:100%;max-height:none;position:static;overflow:visible}.pr-room .pr-guide-section,.pr-room .pr-reading{border-bottom:1px solid var(--color-line);padding:0}.pr-room .pr-guide-section:first-child,.pr-room .pr-reading:first-child{border-top:1px solid var(--color-line)}.pr-guide-row>summary,.pr-reading__toggle{cursor:pointer;grid-template-columns:minmax(12rem,1fr) minmax(10rem,.75fr) auto;align-items:center;gap:1rem;width:100%;min-height:4.5rem;padding:.75rem 1.5rem;list-style:none;display:grid}.pr-guide-row>summary h3,.pr-reading__toggle strong{font-family:var(--font-serif);margin:0;font-size:1.18rem;font-weight:400}.pr-guide-row>summary .pr-kicker{justify-self:start}.pr-guide-row>summary:after{float:none;justify-self:end;font-size:1.1rem}.pr-guide-row__body,.pr-guide-row>.pr-guide-copy{max-width:54rem;margin:0;padding:0 1.5rem 1.5rem}.pr-reading__toggle>span:first-child{display:contents}.pr-reading__toggle .pr-kicker{grid-area:1/2}.pr-reading__toggle strong{grid-area:1/1}.pr-reading__toggle>span:last-child{grid-area:1/3}.pr-reading__body{max-width:54rem;padding:0 1.5rem 1.5rem}.pr-workbench__attempt[data-staged-work=true]{border:0;margin-top:2.4rem;padding:0}.pr-room .pr-hint-row:first-child{margin-top:2rem}@media (max-width:767px){.pr-chapter--detail{padding:1rem .75rem 3rem}.pr-chapter--detail .pr-room__context{flex-wrap:wrap;align-items:start;gap:.25rem .75rem}.pr-room__route{order:3;width:100%}.pr-room .pr-problem-head{padding-top:1rem}.pr-room .pr-problem-head__status{flex-direction:column;align-items:start;gap:.65rem}.pr-guide-row>summary,.pr-reading__toggle{grid-template-columns:minmax(0,1fr) auto;padding-inline:1rem}.pr-guide-row>summary .pr-kicker,.pr-reading__toggle .pr-kicker{display:none}.pr-guide-row>summary:after,.pr-reading__toggle>span:last-child{grid-column:2}.pr-guide-row__body,.pr-guide-row>.pr-guide-copy,.pr-reading__body{padding-inline:1rem}}.pr-surface{border:1px solid var(--color-line);background:var(--color-paper-3);box-shadow:var(--shadow-elevation-1);border-radius:3px;grid-template-columns:minmax(0,1fr);display:grid}.pr-surface__plate{border-bottom:1px solid var(--color-line);flex-direction:column;gap:.5rem;padding:1.1rem 1.25rem 1rem;display:flex}@media (min-width:1024px){.pr-surface{grid-template-columns:minmax(0,58fr) minmax(0,42fr)}.pr-surface__plate{border-right:1px solid var(--color-line);border-bottom:0}}.pr-surface__plate .pr-visual{box-shadow:none;border:0}.pr-plate-note__lead{max-width:58ch;color:var(--color-ink-muted);font-family:var(--font-serif-body);margin:.35rem 0 0;font-size:.85rem;line-height:1.55}.pr-plate-note__lead strong{color:var(--color-ink-soft);font-weight:500}.pr-plate-note__keyboard{color:var(--color-ink-soft);font-family:var(--font-sans);margin:.55rem 0 0;font-size:.8rem;display:none}.pr-workbench:has(.pr-svg-handle__grab:focus) .pr-plate-note__keyboard{display:block}.pr-sheet{flex-direction:column;display:flex}.pr-sheet__head{justify-content:space-between;align-items:baseline;padding:1.1rem 1.4rem .65rem;display:flex}.pr-sheet__progress{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;margin:0;font-size:.66rem}.pr-sheet__rows{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.pr-sheet__row{border-top:1px solid var(--color-line);padding:.85rem 1.4rem .9rem;position:relative}.pr-sheet__row[data-state=pending]{opacity:.55}.pr-sheet__row[data-state=active]{background:color-mix(in srgb, var(--color-water) 4%, transparent)}.pr-sheet__row[data-state=active]:before{content:"";background:var(--color-water);width:2px;position:absolute;inset:0 auto 0 0}.pr-sheet__row-head{align-items:baseline;gap:.6rem;display:flex}.pr-sheet__index{color:var(--color-cyan-metadata);font-family:var(--font-mono);font-size:.66rem}.pr-sheet__title{font-family:var(--font-serif);letter-spacing:-.01em;margin:0;font-size:1.15rem;font-weight:400}.pr-sheet__saved,.pr-sheet__verdict{font-family:var(--font-mono);letter-spacing:.1em;text-align:right;text-transform:uppercase;margin-left:auto;font-size:.64rem}.pr-sheet__saved{color:var(--color-cyan-label)}.pr-sheet__verdict{color:var(--color-copper)}.pr-sheet__verdict[data-ok]{color:var(--color-cyan-label)}.pr-sheet__relationship{max-width:46ch;color:var(--color-ink-soft);font-family:var(--font-serif-body);margin:.4rem 0 0;font-size:.85rem;line-height:1.5}.pr-sheet__line{flex-wrap:wrap;align-items:center;gap:.4rem .65rem;margin-top:.6rem;display:flex}.pr-sheet__equation{color:var(--color-ink);font-family:var(--font-mono);word-spacing:.15em;font-size:.95rem}.pr-sheet__equation button{border:0;border-bottom:1px dotted var(--color-water-2);min-height:44px;color:var(--color-cyan-numeric);font:inherit;word-spacing:inherit;cursor:pointer;background:0 0;align-items:center;padding:0 .12rem;display:inline-flex}.pr-sheet__equation button:hover,.pr-sheet__equation button:focus-visible{color:var(--color-cyan-label);border-bottom-style:solid}.pr-sheet__equation button:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-sheet__entry{white-space:nowrap;align-items:center;gap:.6rem;display:inline-flex}.pr-sheet__entry input{border:1px solid var(--color-line);background:var(--color-paper-2);width:clamp(7.5rem,20vw,10.5rem);min-height:44px;color:var(--color-cyan-numeric);font-family:var(--font-mono);border-radius:2px;padding:.4rem .65rem;font-size:1rem}.pr-sheet__row[data-state=active] .pr-sheet__entry input{border-color:var(--color-water-2)}.pr-sheet__row[data-heat] .pr-sheet__entry input{color:var(--color-readout-heat)}.pr-sheet__unit{color:var(--color-ink-soft);font-family:var(--font-mono);font-size:.8rem}.pr-sheet__cancel{color:var(--color-ink-muted);font-family:var(--font-mono);flex-wrap:wrap;align-items:baseline;gap:.2rem .75rem;margin:.55rem 0 0;font-size:.78rem;display:flex}.pr-sheet__struck{text-decoration:line-through;-webkit-text-decoration-color:var(--color-flame);text-decoration-color:var(--color-flame)}.pr-sheet__note{color:var(--color-cyan-metadata);letter-spacing:.1em;text-transform:uppercase;flex-basis:100%;font-size:.62rem}.pr-sheet__provenance{border-left:2px solid var(--color-water-2);margin-top:.65rem;padding-left:.85rem}.pr-sheet__provenance .pr-provenance{border-top:0}.pr-sheet__provenance-close{min-height:44px;color:var(--color-cyan-label);font-family:var(--font-sans);cursor:pointer;background:0 0;border:0;align-items:center;padding:0;font-size:.76rem;display:inline-flex}.pr-one-tap-prediction,.pr-one-tap-result{grid-column:1/-1;gap:.65rem;display:grid}.pr-one-tap-prediction h4,.pr-one-tap-result h4{color:var(--color-ink);font-family:var(--font-serif);margin:0;font-size:1rem;font-weight:400}.pr-one-tap-prediction>div{gap:.45rem;display:grid}.pr-one-tap-prediction button{border:1px solid var(--color-line);background:var(--color-paper-2);min-height:44px;color:var(--color-ink-soft);font-family:var(--font-sans);text-align:left;cursor:pointer;border-radius:2px;padding:.5rem .65rem}.pr-one-tap-prediction button:hover,.pr-one-tap-prediction button:focus-visible,.pr-one-tap-prediction button[aria-pressed=true]{border-color:var(--color-water-2);color:var(--color-cyan-label)}.pr-one-tap-result p{color:var(--color-ink-soft);font-family:var(--font-serif-body);margin:0;font-size:.88rem;line-height:1.5}.pr-one-tap-result:focus-visible{outline:2px solid var(--color-water);outline-offset:3px}.pr-sheet__path{border-left:2px solid var(--color-copper);margin-top:.65rem;padding:.15rem 0 .15rem .85rem}details.pr-sheet__path{border-left-color:var(--color-line)}details.pr-sheet__path>summary{min-height:44px;color:var(--color-cyan-label);cursor:pointer;font-family:var(--font-sans);align-items:center;font-size:.78rem;list-style:none;display:flex}details.pr-sheet__path>summary::-webkit-details-marker{display:none}details.pr-sheet__path>summary:focus-visible{outline:2px solid var(--color-water);outline-offset:2px}.pr-sheet__worked code{color:var(--color-ink);font-family:var(--font-mono);font-size:.85rem;display:block}.pr-sheet__worked p{max-width:52ch;color:var(--color-ink-soft);font-family:var(--font-serif-body);margin:.35rem 0 0;font-size:.82rem;line-height:1.5}.pr-sheet__check{border-top:1px solid var(--color-line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;margin-top:auto;padding:.9rem 1.4rem;display:flex}.pr-sheet__state{color:var(--color-cyan-metadata);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;margin:0;font-size:.66rem}@media (max-width:767px){.pr-sheet__check{text-align:center;flex-direction:column;align-items:stretch}.pr-sheet__check .pr-primary-button{width:100%}.pr-sheet__entry{flex:100%}.pr-sheet__entry input{flex:auto;width:100%}}.pr-tower-balance[data-emphasis] .pr-stream,.pr-tower-balance[data-emphasis] .pr-recirculation{opacity:.35;transition:opacity .16s}.pr-tower-balance[data-emphasis=makeup] .pr-stream--makeup,.pr-tower-balance[data-emphasis=evaporation] .pr-stream--evaporation,.pr-tower-balance[data-emphasis=blowdown] .pr-stream--blowdown,.pr-tower-balance[data-emphasis=recirculation] .pr-recirculation{opacity:1}@media (prefers-reduced-motion:reduce){.pr-tower-balance[data-emphasis] .pr-stream,.pr-tower-balance[data-emphasis] .pr-recirculation{transition:none}}.pr-readout--empty .pr-readout__value{fill:var(--color-ink-faint)}.pr-guide-row--locked{border-bottom:1px solid var(--color-line);min-height:46px;color:var(--color-ink-faint);justify-content:space-between;align-items:center;padding:.9rem .25rem;display:flex}.pr-guide-row--locked h3{color:var(--color-ink-faint);font-family:var(--font-serif);margin:0;font-size:1.05rem;font-weight:400}@media (min-width:84rem){.pr-room .pr-room__layout:has(>.pr-workbench:not([data-quiet-workflow])){grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:start;column-gap:clamp(2.5rem,4vw,4.5rem);display:grid}.pr-room .pr-workbench:not([data-quiet-workflow]){display:contents}.pr-room .pr-workbench:not([data-quiet-workflow]) .pr-problem-head{grid-area:1/1/auto/-1}.pr-room .pr-workbench:not([data-quiet-workflow]) .pr-workbench__visual{grid-area:2/2/5}.pr-room .pr-workbench:not([data-quiet-workflow]) .pr-plate-note{grid-area:5/2}.pr-room .pr-workbench:not([data-quiet-workflow]) .pr-workbench__attempt{grid-area:2/1}.pr-room .pr-workbench:not([data-quiet-workflow]) .pr-activity-reflection{grid-area:3/1}.pr-room .pr-room__layout:has(>.pr-workbench:not([data-quiet-workflow])) .pr-guide{grid-area:4/1}}
/*# sourceMappingURL=3dl58t4o67-q-.css.map*/