@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Libre+Caslon+Display&display=swap');
:root{--ink:#203e35;--green:#153e35;--muted:#69786f;--paper:#f6f5ee;--line:#dbdfd4;--gold:#b88943;--light:#e9eee5;--white:#fffefa;--serif:'Libre Caslon Display',Georgia,serif;--sans:'DM Sans',Arial,sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:4px}button{border:0}svg{display:block}h1,h2,h3,p{margin:0}button{color:var(--ink)}.site-header,main,footer{width:min(1200px,calc(100% - 96px));margin:auto}.site-header{height:110px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;gap:13px;align-items:center;text-decoration:none;font:26px/1.1 var(--serif);color:var(--green)}.brand svg{width:42px;height:42px;stroke:var(--green);fill:var(--paper);stroke-width:1.8}.brand-bottom{display:block;font:9px/1 var(--sans);letter-spacing:3px;margin-top:9px}.creator{font-size:12px;text-decoration:none;color:var(--muted)}.creator strong{font-weight:550;color:var(--ink);margin-left:4px}.creator>span{margin-left:10px}.hero{display:grid;grid-template-columns:1.25fr 1fr;align-items:center;gap:30px;padding:55px 0 45px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:650;display:flex;gap:9px;align-items:center}.tiny-dot{height:6px;width:6px;background:var(--gold);border-radius:50%;display:inline-block}h1{font:clamp(44px,4.8vw,68px)/1.02 var(--serif);letter-spacing:-1.3px;margin:21px 0 23px}h1 em{font-weight:400;color:#6c806c}.hero-intro{font-size:13px;line-height:1.8;color:var(--muted)}.hero-art{max-width:410px;justify-self:end;width:100%;padding-top:10px;position:relative}.hero-art svg{width:100%}.art-lines{stroke:#9eaea0;stroke-width:1.4;fill:none}.art-ancestors{fill:#e2e9dc;stroke:#a1b29d;stroke-width:1.2}.art-caption{display:block;text-align:center;font:italic 17px var(--serif);color:var(--muted);margin-top:10px}.page-tabs{display:flex;align-items:stretch;border-bottom:1px solid #cad2c4;gap:31px;margin-bottom:33px}.page-tabs>a{display:flex;gap:9px;align-items:center;padding:17px 0;text-decoration:none;font-size:13px;font-weight:550;border-bottom:2px solid transparent;margin-bottom:-1px;white-space:nowrap;color:#768176}.page-tabs>a.active{color:var(--green);border-color:var(--green)}.tab-number{font-size:9px;color:#98a28f;letter-spacing:1px}.tab-badge{font-size:7px;letter-spacing:1px;padding:2px 5px;background:#e5eadf;color:#70816c;border-radius:3px;margin-left:2px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.section-head h2{font:32px/1.15 var(--serif);letter-spacing:-.3px}.section-head p{font-size:12px;margin-top:6px;color:var(--muted)}.small-actions{display:flex;gap:8px}.text-button{background:transparent;padding:7px 11px;font-size:11px;border:1px solid var(--line);border-radius:5px;white-space:nowrap}.text-button:hover{background:#e8ecdf}.calculator-grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);background:var(--white);border-radius:12px;overflow:hidden}.controls{padding:30px 34px 27px}.control-eyebrow{font-size:9px;letter-spacing:1.8px;font-weight:650;color:#89917e;margin-bottom:19px}.segmented{display:flex;background:#efefe6;border-radius:5px;padding:4px;margin-bottom:21px}.segmented button{padding:7px 14px;background:transparent;border-radius:3px;flex:1;font-size:11px;color:var(--muted)}.segmented button.active{background:var(--white);color:var(--ink);box-shadow:0 1px 4px #173c3210}label,.field-label{display:block;font-size:12px;font-weight:550;margin:0 0 8px}.input-unit{display:flex;align-items:center;border:1px solid #d5dacc;border-radius:6px;background:white;overflow:hidden}.input-unit:focus-within{border-color:var(--green)}.input-unit input{border:0;background:transparent;min-width:0;flex:1;padding:12px 14px;outline:none;color:var(--green);font-weight:500}.input-unit .large-input{font:32px var(--serif);padding:10px 14px}.input-unit span{font-size:11px;color:var(--muted);padding-right:14px;white-space:nowrap}input[type=number]{appearance:textfield;-moz-appearance:textfield}input::-webkit-inner-spin-button{appearance:none}input[type=range]{width:100%;accent-color:var(--green);margin:18px 0 0;cursor:pointer}.range-labels{display:flex;justify-content:space-between;font-size:9px;color:#90998b;margin:0 0 18px}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:19px 0}.select-field{width:100%;height:43px;border:1px solid #d5dacc;border-radius:5px;background:white;padding:0 10px;color:var(--ink);font-size:11px}.field-row .input-unit input{font-size:12px;height:41px;padding:10px}.hint{font-size:10px;line-height:1.7;color:var(--muted);margin-top:8px}.preset-row{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin:15px 0 0}.preset-row>span{font-size:9px;color:#88917f;margin-right:2px}.preset{background:#f0f2e9;color:#56705b;font-size:10px;padding:5px 9px;border-radius:4px}.preset:hover{background:#dce5d5}.input-error{font-size:11px;color:#a04330;margin-top:9px;min-height:0}.input-error:empty{display:none}.result-panel{background:#ecf0e6;border-left:1px solid var(--line);padding:32px 35px;display:flex;flex-direction:column;justify-content:center;min-height:325px;position:relative}.result-tag{font-size:9px;letter-spacing:1.8px;color:#6e8168;font-weight:600;margin-bottom:10px}.result-value{font:84px/.95 var(--serif);letter-spacing:-2px;color:var(--green);overflow-wrap:anywhere}.result-value.compact{font-size:49px;letter-spacing:-.7px;line-height:1.05}.result-unit{font-size:13px;color:#6b7f65;margin-top:10px}.result-detail{font-size:11px;color:#708168;line-height:1.8;margin-top:20px}.result-line{height:1px;background:#d5decb;margin:22px 0 17px}.result-facts{display:grid;grid-template-columns:1fr 1fr;gap:18px}.result-facts strong{display:block;font:26px var(--serif);color:var(--green);overflow-wrap:anywhere}.result-facts span{font-size:9px;color:#7b8873}.result-validation{padding:10px 15px;background:#fff2e4;color:#924c2e;border-radius:4px;margin-top:15px;font-size:11px}.timeline-card{border:1px solid var(--line);border-radius:9px;padding:24px 28px;background:var(--white);margin-top:18px}.mini-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.mini-heading h3{font:22px var(--serif)}.mini-heading>span{font-size:9px;color:var(--muted)}.timeline{display:flex;justify-content:space-between;position:relative;margin:28px 0 10px;gap:8px}.timeline:before{content:'';height:1px;background:#c8d2bd;position:absolute;left:14px;right:14px;top:8px}.timeline-item{position:relative;flex:1;text-align:center;font-size:9px;color:var(--muted)}.timeline-item:first-child{text-align:left}.timeline-item:last-child{text-align:right}.timeline-dot{display:block;border:4px solid var(--white);background:#91a583;border-radius:50%;width:17px;height:17px;margin:0 auto 8px;box-shadow:0 0 0 1px #d4dccd}.timeline-item:first-child .timeline-dot{margin-left:0;background:var(--green)}.timeline-item:last-child .timeline-dot{margin-right:0;background:var(--gold)}.timeline-item strong{display:block;font-weight:500;color:var(--ink);margin-bottom:3px}.credit{font-size:10px;line-height:1.9;color:#7a8576;margin:18px 3px 0;max-width:960px}.credit a{color:#42644d}.bottom-note{display:flex;gap:21px;align-items:center;padding:30px 0 35px;margin-top:25px;border-bottom:1px solid var(--line)}.note-symbol{font:44px var(--serif);color:#a8b49b}.bottom-note h2{font:25px var(--serif);margin-bottom:3px}.bottom-note p{font-size:11px;color:var(--muted)}.bottom-note>a{font-size:11px;margin-left:auto;white-space:nowrap;text-decoration:none}.bottom-note>a span{margin-left:15px}footer{display:flex;justify-content:space-between;gap:20px;padding:28px 0 35px;font-size:10px;color:#7c8777}footer strong{display:block;font-size:11px;font-weight:550;color:#52684f;margin-bottom:4px}footer a{text-decoration:none}footer p{text-align:right;line-height:1.9}.warning-note{background:#f5eee0;color:#80613b;border:1px solid #e6d9bf;padding:15px 19px;border-radius:6px;font-size:11px;margin-top:18px;line-height:1.8}.warning-note strong{font-weight:600}.two-results{display:grid;grid-template-columns:1fr 1fr;gap:24px}.two-results .result-value{font-size:57px}.two-results .result-value.compact{font-size:32px}.two-results .result-unit{font-size:11px}.two-results .result-block+ .result-block{border-left:1px solid #cfdbc5;padding-left:23px}.equation{font-size:11px;color:#829078;margin-top:14px}.exact-number{font:12px/1.7 var(--sans);overflow-wrap:anywhere;margin-top:8px;max-height:125px;overflow:auto;color:#64755d}.exact-toggle{background:transparent;padding:0;margin-top:13px;font-size:10px;color:#456747;text-decoration:underline;text-underline-offset:3px}.table-section{background:var(--white);border:1px solid var(--line);border-radius:9px;overflow:hidden;margin-top:20px}.table-top{display:flex;justify-content:space-between;align-items:center;padding:21px 25px;gap:12px}.table-top h3{font:24px var(--serif)}.table-top p{font-size:10px;color:var(--muted);margin-top:4px}.table-wrap{overflow:auto;max-height:400px}table{border-collapse:collapse;width:100%;text-align:left;font-size:11px;white-space:nowrap}th{font-size:9px;text-transform:uppercase;letter-spacing:1px;font-weight:550;color:#7f8976;background:#f2f4ec;position:sticky;top:0;z-index:1}td,th{padding:12px 25px;border-top:1px solid #eaede3}tr:last-child{background:#f0f4e9}td.numeric{font-variant-numeric:tabular-nums;max-width:340px;overflow:hidden;text-overflow:ellipsis}.table-foot{padding:13px 25px;font-size:10px;color:var(--muted);border-top:1px solid var(--line)}.table-foot .text-button{margin-left:10px}.collapse-card{border:1px solid var(--line);border-radius:9px;background:var(--white);padding:25px 28px;margin-top:20px}.collapse-card summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:10px}.collapse-card summary::-webkit-details-marker{display:none}.collapse-card summary h3{font:24px var(--serif)}.collapse-card summary:after{content:'+';font-size:23px;color:#819170}.collapse-card[open] summary:after{content:'−'}.collapse-card p{font-size:11px;color:var(--muted);margin-top:12px;max-width:760px}.collapse-form{display:flex;gap:20px;align-items:end;margin-top:18px}.collapse-form>div{flex:1;min-width:0}.collapse-result{font:34px var(--serif);padding:0 10px 7px}.collapse-label{display:block;font:10px var(--sans);color:var(--muted)}.chart{width:100%;height:180px;margin-top:10px}.chart text{font-family:var(--sans);fill:#8a9581;font-size:10px}.chart line{stroke:#e4e8db}.info-intro{display:grid;grid-template-columns:1fr 1.1fr;gap:55px;align-items:start;padding:3px 0 30px}.info-intro h2{font:46px/1.06 var(--serif);letter-spacing:-.5px}.info-intro p{font-size:13px;color:var(--muted);line-height:1.9}.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.info-card{background:var(--white);border:1px solid var(--line);border-radius:9px;padding:28px}.info-card h3{font:29px/1.1 var(--serif);margin:12px 0 15px}.info-card p{font-size:12px;line-height:1.9;color:var(--muted);margin-top:13px}.info-card p a{font-size:10px;color:#547447}.info-card.dark{background:var(--green);color:#f3f3e7;border-color:var(--green)}.info-card.dark p{color:#c5d3be}.info-card.dark a{color:#dde6cc}.info-card.dark .eyebrow{color:#a5b99e}.iap-date{font:67px var(--serif);line-height:1;margin:18px 0 8px}.iap-date span{font:18px var(--sans)}.info-wide{grid-column:1/-1}.source-list{margin-top:32px}.source-list h2{font:34px var(--serif);margin-bottom:16px}.source-item{display:grid;grid-template-columns:42px 1fr 25px;gap:10px;padding:19px 0;border-top:1px solid var(--line);text-decoration:none;align-items:start}.source-num{font:24px var(--serif);color:#a8b19b}.source-item h3{font-size:12px;font-weight:600}.source-item p{font-size:11px;color:var(--muted);margin-top:4px}.source-item:hover h3{text-decoration:underline;text-underline-offset:4px}.source-arrow{font-size:18px;color:#8e9f80}.method-note{margin-top:22px;border-top:1px solid var(--line);padding-top:18px;color:var(--muted);font-size:11px;line-height:1.9}.info-card .small-link{display:inline-block;margin-top:18px;font-size:11px}.example-tree{display:flex;justify-content:center;gap:8px;margin-top:18px;flex-wrap:wrap}.example-tree span{width:31px;height:31px;background:#eaf0e1;border:1px solid #c6d2b8;border-radius:50%;display:grid;place-items:center;font-size:10px}.example-tree .repeat{background:#f5e8cf;border-color:#caaa70;color:#956b2f}.tree-caption{font-size:10px;text-align:center;color:#7f8b73;margin-top:10px}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);opacity:0;background:var(--green);color:white;font-size:12px;padding:11px 19px;border-radius:7px;transition:.2s;pointer-events:none;z-index:10}.toast.show{opacity:1;transform:translate(-50%,0)}.skip-link{position:fixed;top:-80px;left:15px;background:var(--green);color:white;padding:10px;z-index:30}.skip-link:focus{top:10px}[hidden]{display:none!important}.empty-result{font:40px var(--serif);color:#7f8d73}.field-gap{margin-top:18px}
@media(min-width:1500px){.hero{padding-top:66px;padding-bottom:55px}}
@media(max-width:1000px){.site-header,main,footer{width:calc(100% - 56px)}.hero{grid-template-columns:1.4fr 1fr;gap:15px}.hero-art{width:100%}.page-tabs{gap:23px}.controls,.result-panel{padding:25px}.hero-intro{font-size:12px}.two-results{gap:14px}.two-results .result-value{font-size:49px}.two-results .result-value.compact{font-size:28px}.info-intro{gap:25px}.result-value{font-size:76px}.desktop-break{display:none}}
@media(max-width:720px){.site-header,main,footer{width:calc(100% - 36px)}.site-header{height:88px}.brand{font-size:23px}.brand svg{width:35px}.creator{font-size:0}.creator strong{font-size:10px}.creator>span{font-size:12px;margin-left:2px}.hero{grid-template-columns:1fr;padding:35px 0 24px}.hero-art{display:none}h1{font-size:49px;margin:18px 0}.hero-intro{font-size:12px}.eyebrow{font-size:9px}.page-tabs{gap:22px;overflow-x:auto;margin-bottom:25px}.page-tabs>a{font-size:12px;padding:15px 0}.tab-number{display:none}.tab-badge{display:none}.section-head{align-items:flex-start}.section-head h2{font-size:29px}.section-head p{font-size:11px;max-width:250px}.small-actions{gap:4px}.text-button{font-size:10px;padding:6px 8px}.calculator-grid{grid-template-columns:1fr}.controls{padding:25px}.result-panel{border-left:0;border-top:1px solid var(--line);padding:28px;min-height:260px}.result-value{font-size:77px}.result-value.compact{font-size:46px}.result-facts strong{font-size:25px}.timeline-card{padding:20px 19px}.mini-heading h3{font-size:21px}.mini-heading>span{font-size:8px}.timeline-item{font-size:8px}.timeline-item strong{font-size:9px}.bottom-note{flex-wrap:wrap;gap:13px;padding:25px 0}.bottom-note>div{flex:1}.bottom-note>a{margin-left:46px;font-size:11px}.bottom-note h2{font-size:23px}.bottom-note p{font-size:10px}.note-symbol{font-size:34px}footer{font-size:9px;display:block;padding:23px 0}footer p{text-align:left;margin-top:15px}.credit{font-size:10px}.info-intro{grid-template-columns:1fr;gap:20px}.info-intro h2{font-size:41px}.info-grid{grid-template-columns:1fr}.info-wide{grid-column:auto}.info-card{padding:25px}.info-card h3{font-size:28px}.two-results{gap:20px}.two-results .result-value{font-size:56px}.two-results .result-value.compact{font-size:32px}.table-top{padding:18px;align-items:flex-start}.table-top h3{font-size:22px}.table-top p{max-width:210px}td,th{padding:11px 18px}.collapse-card{padding:22px}.collapse-form{flex-direction:column;align-items:stretch;gap:12px}.collapse-card summary h3{font-size:22px}.collapse-result{padding:10px 0}.source-item{grid-template-columns:28px 1fr 20px}.warning-note{font-size:10px}.result-detail{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}