a{color:var(--signal-dark);text-underline-offset:.14em}a:hover{text-decoration-thickness:2px}.home-content{margin-top:clamp(4.5rem,9vw,8rem);color:#343833;font-size:17px;line-height:1.65}.home-content h2,.home-content h3,.home-content p,.home-content ol,.home-content ul,.home-content blockquote{margin-top:0}.home-content h2{max-width:16ch;margin-bottom:clamp(1.5rem,3vw,2.5rem);color:var(--ink);font-family:var(--font-display);font-size:clamp(2.75rem,5vw,4.35rem);font-weight:700;letter-spacing:-.05em;line-height:.98}.home-content h3{margin-bottom:.7rem;color:var(--ink);font-family:var(--font-body);font-size:clamp(1.35rem,2.1vw,1.75rem);font-weight:700;letter-spacing:-.025em;line-height:1.12}.home-content p{max-width:62ch;margin-bottom:1.1em}.home-content code{padding:.06em .25em;border:1px solid var(--line-soft);border-radius:0;background:var(--surface);color:var(--ink);font-family:var(--font-math);font-size:.9em;font-variant-numeric:tabular-nums;font-weight:500;overflow-wrap:anywhere}.home-content table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}.home-content th,.home-content td{padding:.8rem;border-top:1px solid var(--line-soft);text-align:left;vertical-align:top}.home-content th{color:var(--muted);font-size:.7rem;font-weight:600;letter-spacing:.075em;text-transform:uppercase}.content-section{display:grid;grid-template-columns:6.5rem minmax(0,1fr);min-width:0;margin:0 0 clamp(5rem,10vw,9rem);border-top:1px solid var(--line-soft);padding-top:.8rem}.content-section__rail{display:flex;min-width:0;flex-direction:column;gap:1rem;padding-right:1.5rem}.content-section__index{display:block;color:var(--muted);font-family:var(--font-display);font-size:clamp(2.75rem,4.7vw,4rem);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.06em;line-height:.86}.content-section__label,.editorial-card__label,.editorial-feature__label{display:block;color:var(--muted);font-size:.67rem;font-weight:600;letter-spacing:.09em;line-height:1.35;text-transform:uppercase}.content-section__body{min-width:0}.content-section__body>:last-child{margin-bottom:0}.content-section--steps{border-top:2px solid var(--line)}.content-section--steps .content-section__index{color:var(--signal)}.content-section--steps .content-section__body>ol{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:2rem 0 0;padding:0;border-top:1px solid var(--line);counter-reset:manual-step;list-style:none}.content-section--steps .content-section__body>ol>li{position:relative;min-width:0;padding:3.25rem 1.35rem 1rem 0;counter-increment:manual-step}.content-section--steps .content-section__body>ol>li::before{position:absolute;top:-.75rem;left:0;display:grid;width:2.25rem;height:1.5rem;place-items:center;background:var(--paper);color:var(--signal);content:counter(manual-step,decimal-leading-zero);font-family:var(--font-math);font-size:.85rem;font-weight:500}.content-section--steps .content-section__body>ol>li:not(:last-child)::after{position:absolute;top:-1.05rem;right:.65rem;color:var(--signal);content:"→";font-family:var(--font-math);font-size:1.1rem}.content-section--steps .content-section__body>p{margin:2rem 0 0 auto;color:var(--muted)}.content-section--definition .content-section__body{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 3rem}.content-section--definition .content-section__body>h2,.content-section--definition .math-visual,.content-section--definition .content-section__body>.editorial-grid{grid-column:1/-1}.tool>.prose .content-section h2{margin-top:0}.content-section--definition .editorial-feature{grid-template-columns:minmax(0,1fr);grid-template-areas:"label" "value" "body";gap:.75rem}.content-section--definition .editorial-feature__value,.content-section--definition .editorial-card__result{overflow-wrap:normal;white-space:nowrap}.tool>.prose .content-section--definition blockquote{margin:0 0 1.5rem;padding:1.2rem 1.5rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface);color:var(--ink);font-family:var(--font-math);font-size:clamp(1.75rem,4vw,3.4rem);font-weight:500;line-height:1;text-align:center}.tool>.prose .content-section--definition blockquote p{max-width:none;margin:0}.tool .content-section blockquote p{white-space:nowrap}.content-section--formula{grid-template-columns:6.5rem minmax(0,1fr);margin-right:0;margin-left:0;padding:clamp(1.5rem,3vw,2.5rem);border-top:0;background:var(--ink);color:var(--paper)}.content-section--formula .content-section__rail{margin-right:1.5rem;border-right:1px solid #4b5049}.content-section--formula .content-section__index{color:#df7657}.content-section--formula .content-section__label{color:#bdc0ba}.content-section--formula h2,.content-section--formula h3{color:var(--paper)}.content-section--formula p{color:#d4d5d0}.content-section--formula code{border-color:#545953;background:0 0;color:var(--paper)}.tool>.prose .content-section--formula blockquote{margin:0 0 1.5rem;padding:1.2rem;border-top:1px solid #5b6059;border-bottom:1px solid #5b6059;color:var(--paper);font-family:var(--font-math);font-size:clamp(1rem,3vw,2.7rem);font-weight:500;line-height:1;text-align:center}.tool>.prose .content-section--formula blockquote p{max-width:none;margin:0;white-space:nowrap}.content-section--solver .content-section__index{color:var(--mineral)}.content-section--solver .content-section__body>ol{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:1.5rem 0;padding:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line-soft);list-style:none;counter-reset:solve-step}.content-section--solver .content-section__body>ol>li{position:relative;min-width:0;padding:2.2rem .85rem .85rem;border-right:1px solid var(--line-soft);color:var(--ink);font-family:var(--font-math);font-size:.9rem;font-weight:500;counter-increment:solve-step}.content-section--solver .content-section__body>ol>li::before{position:absolute;top:.55rem;left:.85rem;color:var(--muted);content:"0" counter(solve-step);font-family:var(--font-body);font-size:.62rem;font-weight:600;letter-spacing:.08em}.content-section--solver .content-section__body>ol>li:last-child{border-right:0;border-bottom:3px solid var(--signal)}.content-section--fractions{padding:clamp(1.5rem,3vw,2.5rem);border-top:0;background:var(--surface)}.content-section--fractions .content-section__body{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 3rem}.content-section--fractions .content-section__body>h2,.content-section--fractions .content-section__body>.math-visual,.content-section--fractions .content-section__body>.editorial-grid,.content-section--fractions .content-section__body>blockquote{grid-column:1/-1}.tool>.prose .content-section--fractions blockquote{font-size:clamp(1rem,3vw,2.4rem)}.content-section--examples .content-section__index{color:var(--signal)}.editorial-grid--examples{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:1.5rem;margin-top:1.75rem}.editorial-grid--examples>.editorial-card:nth-child(1){grid-column:1/8;grid-row:1/3;border-top-color:var(--ink)}.editorial-grid--examples>.editorial-card:nth-child(2){grid-column:8/-1;border-top-color:var(--signal)}.editorial-grid--examples>.editorial-card:nth-child(3){grid-column:8/-1;border-top-color:var(--mineral)}@media(min-width:721px){.content-section--definition .editorial-grid--examples{grid-template-columns:repeat(3,minmax(0,1fr))}.content-section--definition .editorial-grid--examples>.editorial-card:nth-child(n){grid-column:auto;grid-row:auto}}.content-section--inputs .content-section__index{color:var(--mineral)}.editorial-grid--specimens{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));margin:1.5rem 0 2rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.editorial-grid--specimens>.editorial-card{min-width:0;padding:1.15rem;border-right:1px solid var(--line-soft)}.editorial-grid--specimens>.editorial-card:last-child{border-right:0}.editorial-grid--specimens .editorial-card__meta{min-height:7.5rem}.editorial-grid--specimens .editorial-card__result{font-size:clamp(1.45rem,2.4vw,2rem);overflow-wrap:anywhere}.content-section--mistakes .content-section__index{color:var(--signal)}.editorial-grid--mistakes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 2.5rem;margin-top:1.5rem}.editorial-grid--mistakes>.editorial-card{display:grid;grid-template-columns:minmax(9rem,.7fr)minmax(0,1fr);gap:1.25rem;padding:1.15rem 0;border-top:1px solid var(--line-soft)}.editorial-grid--mistakes>.editorial-card::before{grid-column:1/-1;width:1.1rem;height:2px;background:var(--signal);content:""}.editorial-grid--mistakes>.editorial-card:last-child:nth-child(odd){grid-column:1/-1}.editorial-grid--mistakes .editorial-card__meta{min-height:0}.content-section--applications .content-section__index{color:var(--mineral)}.editorial-grid--applications{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2rem;margin-top:1.5rem}.editorial-grid--applications>.editorial-card{padding:1.25rem 0;border-top:3px solid var(--mineral)}.editorial-grid--applications>.editorial-card:nth-child(2){border-top-color:var(--line)}.editorial-grid--applications>.editorial-card:nth-child(3){border-top-color:var(--signal)}.content-section--faq .content-section__index{color:var(--muted)}.editorial-grid--faq{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 3rem;margin-top:1rem}.editorial-grid--faq>.editorial-card{padding:1.35rem 0 2rem;border-top:1px solid var(--line)}.editorial-grid--faq .editorial-card__meta{min-height:0}.content-section--method{grid-template-columns:6.5rem minmax(0,1fr);margin-bottom:0;padding:1.25rem 0 0;border-top:1px solid var(--line)}.content-section--method .content-section__body{display:grid;grid-template-columns:minmax(0,.9fr)minmax(16rem,.6fr);gap:1rem 3rem}.content-section--method .content-section__body>h2{grid-column:1/-1;max-width:18ch;font-size:clamp(2.3rem,4vw,3.5rem)}.content-section--method p{color:var(--muted);font-size:.95rem}.math-visual{min-width:0;margin:clamp(2rem,4vw,3.25rem)0}.math-visual__stage{min-width:0;padding:clamp(1.25rem,3vw,2rem);border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface)}.math-visual__node{min-width:0;color:var(--ink);font-family:var(--font-math);font-size:clamp(1.25rem,2.7vw,2.1rem);font-variant-numeric:tabular-nums;font-weight:500;line-height:1.15;overflow-wrap:anywhere}.math-visual__arrow{color:var(--signal);font-family:var(--font-math);font-size:1.25rem;font-weight:500}.math-visual__label{color:var(--muted);font-family:var(--font-body);font-size:.67rem;font-weight:600;letter-spacing:.07em;line-height:1.35;text-transform:uppercase}.math-visual__wrong,.math-visual__right{display:grid;min-width:0;gap:.65rem;padding:1.1rem}.math-visual__wrong{border-left:3px solid var(--error);background:var(--error-soft)}.math-visual__right{border-left:3px solid var(--mineral);background:var(--mineral-soft)}.math-visual__right .math-visual__label{color:var(--mineral)}.math-visual figcaption{margin-top:.65rem;color:var(--muted);font-size:.76rem;line-height:1.45}.data-visual{min-width:0;margin:clamp(2rem,4vw,3.5rem)0}.data-visual__stage{min-width:0;padding:clamp(1.25rem,3vw,2rem);border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface)}.data-visual figcaption{margin-top:.65rem;color:var(--muted);font-size:.76rem;line-height:1.45}.data-visual__ratio{display:flex;align-items:stretch;gap:.35rem}.data-visual__share{display:flex;min-height:9rem;flex-direction:column;justify-content:space-between;padding:.85rem;background:var(--mineral-soft)}.data-visual__share--2{flex:2}.data-visual__share--3{flex:3;background:var(--signal-soft)}.data-visual__share--5{flex:5;background:var(--ink);color:var(--paper)}.data-visual__share span,.data-visual__bars span{font-size:.65rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.data-visual__share strong{font-family:var(--font-display);font-size:clamp(2rem,5vw,4.5rem);letter-spacing:-.06em;line-height:.85}.data-visual__axis{position:relative;min-height:12rem}.data-visual__line{position:absolute;right:2rem;bottom:5rem;left:2rem;height:1px;background:var(--line)}.data-visual__mark{position:absolute;bottom:3.55rem;display:flex;align-items:center;flex-direction:column;color:var(--ink);font-family:var(--font-math);transform:translateX(-50%)}.data-visual__mark::after{width:2px;height:2.8rem;margin-top:.45rem;background:currentColor;content:""}.data-visual__mark small{color:var(--muted);font-family:var(--font-body);font-size:.6rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.data-visual__mark strong{font-size:clamp(.8rem,1.8vw,1.05rem);font-weight:500;white-space:nowrap}.data-visual__mark--null{left:35%}.data-visual__mark--sample{left:72%;color:var(--signal)}.data-visual__distance{position:absolute;bottom:6rem;left:53.5%;color:var(--signal);font-family:var(--font-math);font-size:.75rem;transform:translateX(-50%)}.data-visual__interval{position:absolute;bottom:4.75rem;left:15%;width:70%;height:.55rem;background:var(--signal)}.data-visual__axis--interval .data-visual__mark--lower,.data-visual__axis--difference .data-visual__mark--lower{left:15%}.data-visual__axis--interval .data-visual__mark--estimate,.data-visual__axis--difference .data-visual__mark--estimate{left:50%;color:var(--signal)}.data-visual__axis--interval .data-visual__mark--upper,.data-visual__axis--difference .data-visual__mark--upper{left:85%}.data-visual__axis--difference .data-visual__interval{left:18%;width:67%}.data-visual__zero{position:absolute;bottom:5.15rem;left:15%;color:var(--muted);font-family:var(--font-math);font-size:.75rem;transform:translate(-50%,100%)}.data-visual__bars{display:grid;gap:1rem}.data-visual__bars>div{display:grid;grid-template-columns:6rem minmax(0,1fr)5rem;align-items:center;gap:1rem}.data-visual__bars i{display:block;width:var(--bar);height:2.5rem;background:var(--mineral)}.data-visual__bars>div:nth-child(2) i{background:var(--signal)}.data-visual__bars strong{font-family:var(--font-math);font-size:1rem;font-weight:500;text-align:right}.data-visual__bars p{display:flex;justify-content:space-between;max-width:none;margin:.5rem 0 0;border-top:1px solid var(--line-soft);padding-top:.75rem}.data-visual__bars p strong{color:var(--signal);font-size:clamp(1.5rem,3vw,2.5rem)}.math-visual--definition .math-visual__stage{display:grid;grid-template-columns:repeat(7,minmax(0,auto));align-items:center;justify-content:center;gap:.65rem clamp(.55rem,2vw,1.5rem);text-align:center}.math-visual--definition .math-visual__node{display:grid;width:clamp(2.75rem,6vw,4.5rem);aspect-ratio:1;place-items:center;border:1px solid var(--line)}.math-visual--definition .math-visual__stage>.math-visual__arrow:nth-child(8),.math-visual--definition .math-visual__stage>.math-visual__label:nth-child(9),.math-visual--definition .math-visual__stage>.math-visual__arrow:nth-child(10),.math-visual--definition .math-visual__stage>.math-visual__label:nth-child(11){grid-column:1/-1}.math-visual--definition .math-visual__stage>.math-visual__arrow:nth-child(8),.math-visual--definition .math-visual__stage>.math-visual__arrow:nth-child(10){letter-spacing:.08em}.math-visual--solver .math-visual__stage,.math-visual--fractions .math-visual__stage{display:flex;align-items:center;gap:.8rem}.math-visual--solver .math-visual__stage>.math-visual__label,.math-visual--fractions .math-visual__stage>.math-visual__label{max-width:6rem;text-align:center}.math-visual--solver .math-visual__right,.math-visual--fractions .math-visual__right{margin-left:auto}.math-visual--mistakes .math-visual__stage{display:grid;grid-template-columns:minmax(0,1fr)auto minmax(0,1fr);align-items:center;gap:1.5rem}.editorial-grid{min-width:0}.editorial-card{min-width:0;color:#343833}.editorial-card__meta{display:flex;min-width:0;flex-direction:column}.editorial-card__index{display:block;margin-bottom:1.75rem;color:var(--muted);font-family:var(--font-display);font-size:clamp(2.5rem,5vw,4.25rem);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.055em;line-height:.85}.editorial-card__label{margin-bottom:.6rem}.editorial-card__result{margin:0 0 .85rem;color:var(--ink);font-family:var(--font-math);font-size:clamp(1.8rem,3vw,2.65rem);font-variant-numeric:tabular-nums;font-weight:500;letter-spacing:-.035em;line-height:1;overflow-wrap:anywhere}.editorial-card__body{font-size:.96em;line-height:1.62}.editorial-card__body>:last-child{margin-bottom:0}.editorial-card h3{margin-top:0}.editorial-grid--examples>.editorial-card{padding:clamp(1.25rem,2.7vw,2rem);border-top:3px solid var(--line);background:var(--surface)}.editorial-grid--examples>.editorial-card:nth-child(2){background:var(--signal-soft)}.editorial-grid--examples>.editorial-card:nth-child(3){background:var(--mineral-soft)}.editorial-grid--formulas{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin:1.5rem 0;border-top:1px solid #4f544e;border-left:1px solid #4f544e}.editorial-grid--formulas>.editorial-card{min-width:0;padding:1.25rem;border-right:1px solid #4f544e;border-bottom:1px solid #4f544e}.editorial-grid--formulas .editorial-card__label{color:#bfc2bc}.editorial-grid--formulas .editorial-card__result{color:var(--paper);font-size:clamp(1.45rem,2.4vw,2.15rem);white-space:nowrap}.editorial-feature{display:grid;grid-template-columns:minmax(7rem,.28fr)minmax(0,1fr);grid-template-areas:"label value" "label body";gap:.75rem 2rem;min-width:0;margin:1.75rem 0;padding:1.5rem 0;border-top:1px solid;border-bottom:1px solid}.editorial-feature__meta{display:contents}.editorial-feature__label{grid-area:label}.editorial-feature__value{grid-area:value;color:var(--signal);font-family:var(--font-math);font-size:clamp(2.25rem,5.5vw,5rem);font-variant-numeric:tabular-nums;font-weight:500;letter-spacing:-.045em;line-height:.95;overflow-wrap:normal;white-space:nowrap}.editorial-feature__body{grid-area:body;max-width:58ch;color:inherit}.editorial-feature__body>:last-child{margin-bottom:0}.editorial-feature--ink{color:var(--paper)}.editorial-feature--ink .editorial-feature__label{color:#bdc0ba}.prose{max-width:70ch;font-size:17px;line-height:1.7}.tool>.prose{max-width:none;margin-top:clamp(4.5rem,9vw,8rem)}.tool>.prose>p,.tool>.prose>ul,.tool>.prose>ol{max-width:62ch}.prose h2{margin-top:2.75rem;font-family:var(--font-display);font-size:clamp(1.9rem,3.5vw,2.8rem);font-weight:700;letter-spacing:-.04em;line-height:1.03}.tool>.prose h2{max-width:16ch;margin-top:clamp(4.5rem,9vw,7.5rem);font-size:clamp(2.65rem,5vw,4.2rem);letter-spacing:-.05em;line-height:.98}.tool>.prose>h2:first-child{margin-top:0;border-top:1px solid var(--line);padding-top:.8rem}.prose h3{margin-top:2rem;font-size:1.25rem;font-weight:700;letter-spacing:-.02em;line-height:1.2}.prose p,.prose li{color:#343833}.prose .content-section--formula p,.prose .content-section--formula li{color:#d4d5d0}.prose .content-section--formula code{border-color:#545953;background:0 0;color:var(--paper)}.prose code{padding:.08em .3em;border:1px solid var(--line-soft);background:var(--surface);font-family:var(--font-math);font-size:.9em;font-weight:500}.prose blockquote{max-width:none;margin:2rem 0;padding:1.35rem 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--ink);font-family:var(--font-math);font-size:clamp(1.55rem,3.8vw,3rem);font-weight:500;line-height:1.12}.prose blockquote p{max-width:none;margin:0;color:inherit}.prose>table{margin:2rem 0 3rem;background:var(--surface)}.hub-copy{max-width:none}.hub-copy>p{max-width:66ch}.hub-copy>h2{max-width:18ch;margin-top:clamp(4rem,8vw,7rem);font-size:clamp(2.5rem,5vw,4rem)}.related{margin-top:4rem;border-top:1px solid var(--line);padding-top:.8rem}.related h2{margin:0 0 1.25rem;color:var(--muted);font-size:.7rem;font-weight:600;letter-spacing:.085em;text-transform:uppercase}.related ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0 2rem;margin:0;padding:0;list-style:none}.related li{padding:1rem 0;border-top:1px solid var(--line-soft)}.related a{color:var(--ink);font-weight:600}.related span{color:var(--muted)}.tool-grid,.hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.5rem;margin:clamp(3rem,7vw,6rem)0 0;padding:0;list-style:none}.tool-grid{counter-reset:tool-directory}.tool-grid>li{min-width:0;counter-increment:tool-directory}.tool-card,.hub-card{position:relative;display:block;height:100%;padding:1.25rem 2.5rem 1.25rem 0;border-top:1px solid var(--line);color:var(--ink);text-decoration:none}.tool-card::before{display:block;margin-bottom:2.25rem;color:var(--signal);content:"0" counter(tool-directory);font-family:var(--font-display);font-size:clamp(3.5rem,7vw,6rem);font-weight:700;letter-spacing:-.07em;line-height:.82}.tool-card::after,.hub-card::after{position:absolute;top:.9rem;right:.25rem;color:var(--signal);content:"↗";font-family:var(--font-math);font-weight:500}.tool-card:hover,.hub-card:hover{border-top-color:var(--signal)}.tool-card h2,.hub-card h2{margin:0 0 .6rem;color:var(--ink);font-family:var(--font-display);font-size:1.25rem;font-weight:700;letter-spacing:-.025em;line-height:1.1}.tool-card p,.hub-card p{margin:0;color:var(--muted);font-size:.93rem;line-height:1.5}.trust-page{max-width:64rem}.trust-hero{padding-bottom:clamp(1.75rem,4vw,3rem)}.trust-hero h1{max-width:12ch}.trust-reviewed{margin:0 0 clamp(3rem,7vw,5.5rem);border-top:1px solid var(--line-soft);padding-top:.65rem;color:var(--muted);font-size:.69rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.trust-content{max-width:54rem}.trust-content>p:first-child{max-width:66ch;color:var(--ink);font-size:1.1rem}.trust-content h2{max-width:18ch}.site-footer{margin-top:clamp(3rem,7vw,6rem);padding:clamp(3rem,7vw,6rem)0 2rem;background:var(--ink);color:var(--paper)}.footer-masthead{display:grid;grid-template-columns:minmax(7rem,.28fr)minmax(0,1fr);align-items:end;gap:2rem;border-bottom:1px solid #4b5049;padding-bottom:clamp(2rem,5vw,4rem)}.footer-mark{color:#df7657;font-family:var(--font-math);font-size:clamp(5rem,12vw,10rem);font-weight:500;letter-spacing:-.08em;line-height:.65}.footer-brand{display:inline-block;color:var(--paper);font-family:var(--font-display);font-size:clamp(2.4rem,5.5vw,5rem);font-weight:700;letter-spacing:-.055em;line-height:.92;text-decoration:none}.footer-masthead p{max-width:46rem;margin:1rem 0 0;color:#bdc0ba;font-size:.95rem;line-height:1.55}.footer-directory{display:grid;grid-template-columns:.7fr 1.35fr .75fr .55fr;gap:clamp(2rem,5vw,5rem);padding:clamp(2rem,5vw,4rem)0}.footer-column{display:flex;min-width:0;flex-direction:column;align-items:flex-start;gap:.7rem}.footer-column h2{margin:0 0 .65rem;color:#999e97;font-size:.65rem;font-weight:600;letter-spacing:.1em;line-height:1.35;text-transform:uppercase}.footer-column a{color:var(--paper);font-size:.9rem;font-weight:500;text-decoration:none}.footer-column a:hover{color:#e17a5b}.footer-column p{max-width:31rem;margin:0;color:#bdc0ba;font-size:.86rem;line-height:1.6}.footer-baseline{display:flex;justify-content:space-between;gap:1rem;border-top:1px solid #4b5049;padding-top:1.25rem;color:#999e97;font-size:.68rem;font-weight:600;letter-spacing:.055em;line-height:1.45;text-transform:uppercase}.footer-baseline p{margin:0}.notfound{padding:3rem 0}@media(max-width:960px){.footer-directory{grid-template-columns:repeat(2,minmax(0,1fr))}.content-section,.content-section--formula,.content-section--method{grid-template-columns:minmax(0,1fr)}.content-section__rail,.content-section--formula .content-section__rail{display:flex;align-items:baseline;justify-content:space-between;flex-direction:row;gap:1rem;margin:0 0 1.5rem;padding:0 0 .75rem;border-right:0;border-bottom:1px solid var(--line-soft)}.content-section--formula .content-section__rail{border-bottom-color:#4b5049}.content-section__index{font-size:2.75rem}.content-section--steps .content-section__body>ol{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:1rem}.content-section--definition .content-section__body{gap:0 2rem}.content-section--fractions{padding:1.5rem}.content-section--method .content-section__body{grid-template-columns:1fr}.content-section--method .content-section__body>h2{grid-column:1}.editorial-grid--specimens{grid-template-columns:repeat(3,minmax(0,1fr))}.editorial-grid--specimens>.editorial-card:nth-child(n+4){border-top:1px solid var(--line-soft)}.math-visual--solver .math-visual__stage,.math-visual--fractions .math-visual__stage{flex-wrap:wrap}.math-visual--solver .math-visual__right,.math-visual--fractions .math-visual__right{margin-left:0}}@media(max-width:720px){.home-content{margin-top:4.5rem;font-size:16px;line-height:1.65}.home-content h2{max-width:17ch;font-size:clamp(2.35rem,11vw,3.4rem);line-height:1}.content-section{margin-bottom:5.25rem}.content-section--definition .content-section__body,.content-section--fractions .content-section__body{grid-template-columns:minmax(0,1fr)}.content-section--definition .content-section__body>h2,.content-section--definition .math-visual,.content-section--definition .content-section__body>.editorial-grid,.content-section--fractions .content-section__body>h2,.content-section--fractions .content-section__body>.math-visual,.content-section--fractions .content-section__body>.editorial-grid{grid-column:1}.content-section--steps .content-section__body>ol{grid-template-columns:1fr;border-top:0}.content-section--steps .content-section__body>ol>li{padding:.75rem 0 1.5rem 3rem;border-left:1px solid var(--line-soft)}.content-section--steps .content-section__body>ol>li::before{top:.65rem;left:-1.1rem}.content-section--steps .content-section__body>ol>li:not(:last-child)::after{top:auto;right:auto;bottom:-.2rem;left:-.45rem;content:"↓"}.content-section--solver .content-section__body>ol{grid-template-columns:repeat(2,minmax(0,1fr))}.content-section--solver .content-section__body>ol>li:nth-child(2){border-right:0}.editorial-grid--examples{grid-template-columns:1fr;gap:1rem}.content-section--definition .editorial-grid--examples{grid-template-columns:minmax(0,1fr)}.editorial-grid--examples>.editorial-card:nth-child(1),.editorial-grid--examples>.editorial-card:nth-child(2),.editorial-grid--examples>.editorial-card:nth-child(3){grid-column:1;grid-row:auto}.editorial-grid--specimens,.editorial-grid--mistakes,.editorial-grid--applications,.editorial-grid--faq,.editorial-grid--formulas{grid-template-columns:1fr}.editorial-grid--specimens>.editorial-card{border-top:1px solid var(--line-soft);border-right:0}.editorial-grid--mistakes>.editorial-card{grid-template-columns:1fr;gap:.75rem}.editorial-grid--mistakes>.editorial-card:last-child:nth-child(odd){grid-column:1}.editorial-grid--applications{gap:1rem}.editorial-feature{grid-template-columns:minmax(0,1fr);grid-template-areas:"label" "value" "body";gap:.75rem}.editorial-feature__value{font-size:clamp(2rem,11vw,3.75rem)}.math-visual__stage{padding:1rem}.math-visual--solver .math-visual__stage,.math-visual--fractions .math-visual__stage{align-items:stretch;flex-direction:column}.math-visual--solver .math-visual__stage>.math-visual__label,.math-visual--fractions .math-visual__stage>.math-visual__label{max-width:none;text-align:left}.math-visual--solver .math-visual__arrow,.math-visual--fractions .math-visual__arrow{transform:rotate(90deg);align-self:flex-start;margin-left:1rem}.math-visual--mistakes .math-visual__stage{grid-template-columns:1fr;gap:.75rem}.math-visual--mistakes .math-visual__arrow{transform:rotate(90deg);justify-self:center}.data-visual__ratio{flex-direction:column}.data-visual__share{min-height:5.5rem}.data-visual__bars>div{grid-template-columns:4.5rem minmax(0,1fr)4.25rem;gap:.65rem}.data-visual__axis{min-height:11rem;padding-right:.5rem;padding-left:.5rem}.data-visual__line{right:1rem;left:1rem}.data-visual__mark strong{font-size:.72rem}.home-content table{display:block;max-width:100%;overflow-x:auto}.related ul{grid-template-columns:1fr}.footer-masthead{grid-template-columns:1fr;gap:1.5rem}.footer-mark{font-size:5.5rem}.footer-directory{grid-template-columns:1fr;gap:2.5rem}.footer-baseline{align-items:flex-start;flex-direction:column}}@media(max-width:430px){.content-section--formula,.content-section--fractions{padding:1rem}.content-section--solver .content-section__body>ol{grid-template-columns:1fr}.content-section--solver .content-section__body>ol>li{border-right:0;border-bottom:1px solid var(--line-soft)}.math-visual--definition .math-visual__stage{gap:.55rem .35rem;padding:.9rem .5rem}.math-visual--definition .math-visual__node{width:2.3rem;font-size:1.15rem}.math-visual--definition .math-visual__label{font-size:.58rem}.editorial-card__index{font-size:2.75rem}.prose{font-size:16px}.tool-grid,.hub-grid{grid-template-columns:1fr}}