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Roman,serif;font-style:italic}.pad-key[data-tone=act]{color:var(--dim);font-size:.9rem}.pad-key[data-tone=go]{background:var(--gold);color:var(--gold-ink);border-color:var(--gold);grid-column:span 1;font-size:.72rem;font-weight:800;line-height:1.05}.newsletter{grid-template-columns:minmax(0,360px) auto;justify-content:start;align-items:end;gap:12px;display:grid}.newsletter .field{grid-row:auto;grid-template-rows:none;margin:0}.newsletter .notice{grid-column:1/-1;margin:0}@media (width<=560px){.newsletter{grid-template-columns:minmax(0,1fr)}}.panel{background:var(--lift);border:1px solid var(--line);border-radius:var(--radius);padding:var(--pad)}.live-problem{top:calc(var(--topbar) + 8px);z-index:3;border-radius:var(--radius-small);border:1px solid color-mix(in srgb, var(--gold) 45%, var(--line));background:color-mix(in srgb, var(--gold) var(--tint), var(--well));gap:6px;min-width:0;margin-bottom:20px;padding:14px 18px 12px;display:grid;position:sticky}.live-problem .eyebrow{color:var(--gold);margin:0}.live-problem p{margin:0}.live-statement{min-width:0;transition:opacity .12s}.live-problem[data-state=waiting] .live-statement{opacity:.4}.live-hint{color:var(--ink);font-size:.88rem;font-weight:500}.live-fix{color:var(--ink);border-top:1px solid color-mix(in srgb, var(--gold) 30%, var(--line));padding-top:8px;font-size:.88rem;line-height:1.5}.live-fix s{color:var(--rose)}.live-fix strong{font-weight:700}.form-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,170px),1fr));gap:0 16px;display:grid}.field{grid-template-rows:subgrid;color:var(--ink);grid-row:span 3;gap:6px;margin-bottom:16px;font-size:.9rem;font-weight:600;display:grid}.field .field-label{align-self:end}.field .help{color:var(--dim);font-size:.8rem;font-weight:400;line-height:1.4}.stack{gap:16px;display:grid}.stack 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var(--line);background:var(--lift-2);width:40px;height:40px;color:var(--ink);cursor:pointer;place-items:center;display:grid}.stepper-button:hover:not(:disabled){border-color:var(--gold)}.stepper-button:disabled{opacity:.35;cursor:default}.stepper-value{text-align:center;font-variant-numeric:tabular-nums;width:1.6rem;font-weight:700}.matrix-scroll{min-width:0;padding-bottom:2px;overflow-x:auto}.matrix-bracket{padding:8px 14px;display:inline-block;position:relative}.matrix-bracket:before,.matrix-bracket:after{content:"";border:2px solid var(--dim);width:9px;position:absolute;top:0;bottom:0}.matrix-bracket:before{border-right:none;border-radius:4px 0 0 4px;left:0}.matrix-bracket:after{border-left:none;border-radius:0 4px 4px 0;right:0}.matrix-cells{--cell:68px;align-items:center;gap:8px;display:grid}.matrix-bar{background:var(--dim);border-radius:1px;align-self:stretch}input.matrix-cell{width:var(--cell);text-align:center;font-variant-numeric:tabular-nums;height:44px;padding:0 6px}@media (width<=520px){.matrix-cells{--cell:42px;gap:5px}.matrix-bracket{padding:6px 11px}input.matrix-cell{border-radius:8px;padding:0 2px;font-size:.88rem}}.segmented{background:var(--well);border:1px solid var(--line);border-radius:13px;grid-template-columns:repeat(auto-fit,minmax(92px,1fr));gap:4px;padding:4px;display:grid}.segment{min-height:44px;color:var(--dim);font:inherit;cursor:pointer;background:0 0;border:1px solid #0000;border-radius:10px;padding:6px 10px;font-size:.93rem;font-weight:600;line-height:1.25}.segment:hover{color:var(--ink)}.segment-short{display:none}.segment-on{background:var(--lift-2);color:var(--ink);border-color:var(--line)}.check-help{margin:12px 2px 16px}.check-size{margin-bottom:16px}.keys{flex-wrap:wrap;gap:6px;margin-bottom:16px;display:flex}.key{border:1px solid var(--line);background:var(--lift-2);min-width:46px;height:40px;color:var(--ink);font:inherit;cursor:pointer;border-radius:9px;padding:0 10px;font-weight:600}.key:hover{border-color:var(--gold)}.check-lines{gap:12px;margin:0 0 18px;padding:0;list-style:none;display:grid}.check-line{grid-template-columns:30px minmax(0,1fr) auto;align-items:start;gap:10px;display:grid}.check-number{height:46px;color:var(--dim);font-variant-numeric:tabular-nums;place-items:center;font-size:.82rem;font-weight:800;display:grid}.check-entry{gap:8px;min-width:0;display:grid}.check-tools{align-items:center;gap:2px;height:46px;display:flex}.check-tools .icon-button:disabled{opacity:.3;cursor:default}.check-read{color:var(--dim);align-items:baseline;gap:10px;padding:0 4px;font-size:.95rem;display:flex;overflow-x:auto}.check-read-tag{letter-spacing:.12em;text-transform:uppercase;flex:none;font-size:.68rem;font-weight:800}.check-read-bad{color:var(--rose)}.check-verdict{--tone:var(--dim);border:1px solid color-mix(in srgb, var(--tone) 55%, var(--line));background:color-mix(in srgb, var(--tone) var(--tint), var(--lift));border-radius:var(--radius-small);gap:6px;padding:12px 14px;display:grid}.check-verdict p{margin:0;line-height:1.55}.check-badge{letter-spacing:.12em;text-transform:uppercase;color:var(--tone);justify-self:start;font-size:.7rem;font-weight:800}.check-good .check-verdict{--tone:var(--mint)}.check-tested .check-verdict{--tone:var(--sky)}.check-partial .check-verdict{--tone:var(--gold)}.check-bad .check-verdict{--tone:var(--rose)}.check-suspect .check-verdict{--tone:var(--gold)}.check-bad>.check-entry>input{border-color:var(--rose)}.check-hint{color:var(--ink)}.check-start{color:var(--dim);margin:0;padding:0 4px;font-size:.9rem}.cards-plain{grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr))}.cards-plain .card{grid-row:auto;grid-template-rows:none}.check-stale .check-verdict{display:none}.check-summary{--tone:var(--mint);padding:18px var(--pad);border-radius:var(--radius);border:1px solid color-mix(in srgb, var(--tone) 60%, var(--line));background:color-mix(in 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var(--tint), var(--lift))}.answer .eyebrow{color:var(--gold)}.problem p,.answer p{margin:0}.lead-line{font-weight:500}.trust{color:var(--dim);align-items:baseline;gap:10px;font-size:.92rem;display:flex}.tex-display{max-width:100%;padding:6px 0;overflow:auto hidden}.tex-waiting{color:var(--dim);overflow-wrap:anywhere;font-family:ui-monospace,Cascadia Code,Consolas,monospace;font-size:.92em}.katex{font-size:1.1em}.tex-display .katex{font-size:1.2em}td .katex{font-size:1.25em}.step{background:var(--lift);border:1px solid var(--line);border-radius:var(--radius);min-width:0;overflow:hidden}.step-head{padding:16px var(--pad);border-bottom:1px solid var(--line);background:var(--lift-2);flex-wrap:wrap;align-items:center;gap:10px 14px;display:flex}.step-number{width:34px;height:34px;color:var(--gold);border:2px solid var(--gold);border-radius:50%;flex:none;place-items:center;font-size:.95rem;font-weight:800;display:grid}.step-locked .step-head{color:var(--dim);border-bottom:none}.step-locked .step-number{color:var(--dim);border-color:var(--line)}.step-locked .icon{color:var(--dim);margin-left:auto}.step-body{padding:var(--pad);gap:18px;min-width:0;display:grid}.step-body>*{min-width:0}.step-body .prose{margin:0}.why{border:1px solid color-mix(in srgb, var(--gold) 50%, var(--line));background:color-mix(in srgb, var(--gold) var(--tint), transparent);border-radius:var(--radius-small);padding:14px 18px}.why-tag{letter-spacing:.13em;text-transform:uppercase;color:var(--gold);margin-bottom:4px;font-size:.72rem;font-weight:800;display:block}.why p{margin:0}.checked{color:var(--mint);letter-spacing:.03em;white-space:nowrap;align-items:center;gap:4px;font-size:.74rem;font-weight:700;display:inline-flex}.line{border:1px solid var(--line);border-radius:var(--radius-small);background:var(--well);grid-template-columns:minmax(0,1fr);gap:4px;padding:12px 16px;display:grid}.line-reason,.chain-reason,.iff-reason{color:var(--dim);font-size:.93rem;line-height:1.55}.chain,.iff{border:1px solid var(--line);border-radius:var(--radius-small);background:var(--well);overflow:hidden}.chain{grid-template-columns:max-content 2.4em minmax(0,1.1fr) minmax(0,1fr);align-items:center;display:grid}.chain-cell{border-top:1px dashed var(--line);align-self:stretch;align-items:center;min-width:0;padding:14px 0;display:flex}.chain-cell:nth-child(-n+4){border-top:none}.chain-lhs{justify-content:flex-end;padding-left:16px}.chain-op{color:var(--relation);justify-content:center}.chain-rhs{overflow:auto hidden}.chain-reason{align-self:center;padding-left:26px;padding-right:16px;display:block}.iff-row{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);align-items:center;gap:4px 26px;padding:14px 16px;display:grid}.iff-row+.iff-row{border-top:1px dashed var(--line)}.iff-link{letter-spacing:.1em;text-transform:uppercase;color:var(--violet);grid-column:1/-1;font-size:.72rem;font-weight:800}.callout{border:1px solid color-mix(in srgb, var(--tone) 55%, var(--line));background:color-mix(in srgb, var(--tone) var(--tint), transparent);border-radius:var(--radius-small);padding:16px 18px}.callout h4{margin-bottom:6px}.callout p{margin:0;font-size:.97rem}.callout-tag{letter-spacing:.13em;text-transform:uppercase;color:var(--tone);margin-bottom:6px;font-size:.7rem;font-weight:800}.callout-why{--tone:var(--gold)}.callout-definition{--tone:var(--sky)}.callout-idea{--tone:var(--violet)}.callout-warning{--tone:var(--rose)}.callout-check,.callout-result{--tone:var(--mint)}.figure,.table-figure{border:1px solid var(--line);border-radius:var(--radius-small);background:var(--well);min-width:0;margin:0;padding:14px}.figure-scroll{overflow-x:auto}figcaption{color:var(--dim);margin-top:10px;font-size:.9rem;line-height:1.5}table{border-collapse:collapse;width:100%;min-width:420px}th,td{text-align:center;border-bottom:1px solid var(--line);padding:10px 14px}th{color:var(--dim);font-size:.9rem;font-weight:700}tr:last-child td{border-bottom:none}.cell-yes{color:var(--mint);font-weight:800}.cell-no{color:var(--rose);font-weight:800}.plot{width:100%;min-width:560px;height:auto;font-family:inherit;display:block}.plot-axis{stroke:var(--dim);stroke-width:1.5px}.plot-tick{fill:var(--dim);font-size:12px}.plot-label{fill:var(--dim);font-size:13px}.plot-band{fill:color-mix(in srgb, var(--mint) 14%, transparent)}.plot-band-edge{stroke:var(--mint);stroke-width:1px;stroke-dasharray:5 5}.plot-limit{stroke:var(--gold);stroke-width:1.8px}.plot-label-limit{fill:var(--gold);font-weight:700}.plot-label-band{fill:var(--mint)}.plot-label-m{fill:var(--violet);font-weight:700}.plot-m-line{stroke:var(--violet);stroke-width:1.5px;stroke-dasharray:3 4}.plot-after-m{fill:color-mix(in srgb, var(--violet) 6%, transparent)}.plot-dot-in{fill:var(--mint)}.plot-glow-in{fill:color-mix(in srgb, var(--mint) 24%, transparent)}.plot-dot-out{fill:var(--rose)}.plot-glow-out{fill:color-mix(in srgb, var(--rose) 24%, transparent)}.plot-off{fill:var(--rose)}.plot-lower{fill:color-mix(in srgb, var(--mint) 30%, transparent);stroke:var(--mint);stroke-width:1px}.plot-gap{fill:color-mix(in srgb, var(--gold) 34%, transparent);stroke:var(--gold);stroke-width:1px}.plot-formula-dot{fill:var(--sky);stroke:var(--well);stroke-width:1.5px}.plot-square{min-width:320px;max-width:560px;margin-inline:auto}.plot-grid{stroke:var(--line);stroke-width:1px}.plot-arrow{stroke:var(--gold);stroke-width:2.4px}.plot-arrow-dim{stroke-width:1.4px;opacity:.75}.plot-arrowhead{fill:var(--gold)}.plot-arc{fill:none;stroke:var(--violet);stroke-width:2px}.plot-circle{fill:none;stroke:var(--mint);stroke-width:1.2px;stroke-dasharray:5 5}.plot-polygon{fill:color-mix(in srgb, var(--mint) 10%, transparent);stroke:var(--mint);stroke-width:1.2px}.plot-dot-gold{fill:var(--gold)}.plot-glow-gold{fill:color-mix(in srgb, var(--gold) 26%, transparent)}.plot-strip{fill:color-mix(in srgb, var(--violet) 12%, transparent)}.plot-guide{stroke:var(--dim);stroke-width:1px;stroke-dasharray:2 5}.plot-curve{fill:none;stroke:var(--sky);stroke-width:3px;stroke-linecap:round}.plot-curve-dim{fill:none;stroke:var(--sky);stroke-width:1.6px;opacity:.4}.plot-hollow{fill:var(--well);stroke:var(--gold);stroke-width:2px}.plot-frame{fill:none;stroke:var(--line);stroke-width:1px}.plot-line{fill:none;stroke-width:2.6px;stroke-linecap:round}.plot-line-1{stroke:var(--sky)}.plot-line-2{stroke:var(--violet)}.plot-line-3{stroke:var(--mint)}.plot-line-4{stroke:var(--rose)}.plot-line-gold{stroke:var(--gold)}.plot-line-grey{stroke:var(--dim)}.plot-thin{stroke-width:1.4px}.plot-wide{stroke-width:5px}.plot-faint{opacity:.45}.plot-head-1{fill:var(--sky)}.plot-head-2{fill:var(--violet)}.plot-head-grey{fill:var(--dim)}.plot-label-1{fill:var(--sky);font-weight:700}.plot-label-2{fill:var(--violet);font-weight:700}.plot-label-grey{fill:var(--dim);font-weight:700}.plot-area{fill:color-mix(in srgb, var(--mint) 18%, transparent);stroke:none}.plot-field{stroke:var(--dim);stroke-width:1.3px;stroke-linecap:round;opacity:.55}.plot-legend{fill:var(--ink)}.plot-halo{paint-order:stroke;stroke:var(--well);stroke-width:5px;stroke-linejoin:round}.paywall{border:1px solid var(--gold);border-radius:var(--radius);padding:28px var(--pad);text-align:center;background:color-mix(in srgb, var(--gold) var(--tint), var(--lift))}.paywall p{color:var(--dim);max-width:40rem;margin:10px auto 20px}.paywall-actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.roadmap{background:var(--lift);border:1px solid var(--line);border-radius:var(--radius);padding:18px var(--pad)}.roadmap-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.roadmap-head .eyebrow{margin:0}.roadmap ol{gap:2px;margin:12px 0 0;padding:0;list-style:none;display:grid}.roadmap a{color:var(--ink);border-radius:9px;align-items:center;gap:12px;padding:7px 8px;font-size:.97rem;font-weight:500;display:flex}.roadmap 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