/* Hallmark · macrostructure: Index-First / Workbench · tone: elegant playful · theme: Almanac · anchor hue: lime 123 · nav: N6 · footer: Ft1
 * Audience: everyday problem-solvers · Use: calculate and understand · system fonts requested
 * Hallmark · pre-emit critique: P4 H5 E4 S5 R4 V4 */
@import url('/assets/tokens.css');
*{box-sizing:border-box}html{overflow-x:clip;scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0;overflow-x:clip;background:var(--color-paper);color:var(--color-ink);font:var(--text-base)/1.6 var(--font-body);-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:var(--color-transparent)}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:4px}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button,a,input,select,textarea,summary{touch-action:manipulation} :focus-visible{outline:3px solid var(--color-focus);outline-offset:4px}::selection{background:var(--color-accent);color:var(--color-accent-ink)}h1,h2,h3,p{margin:0}h1,h2,h3{font-style:normal;overflow-wrap:anywhere;min-width:0}h1,h2{font-family:var(--font-display);font-weight:400;line-height:1.08}h1{font-size:var(--text-display);letter-spacing:-.045em}h2{font-size:clamp(1.8rem,3vw,2.6rem);letter-spacing:-.03em}h3{font-size:var(--text-md);line-height:1.35}p+p{margin-top:var(--space-md)}.shell{width:min(1280px,100%);margin-inline:auto;padding-inline:clamp(1rem,4vw,3rem)}.skip{position:fixed;inset-block-start:-100px;inset-inline-start:1rem;z-index:50;padding:1rem;background:var(--color-accent);color:var(--color-accent-ink)}.skip:focus{inset-block-start:1rem}.masthead{padding-block:var(--space-lg);border-bottom:var(--rule-hair) solid var(--color-rule)}.mast-row{display:flex;justify-content:space-between;align-items:center;gap:var(--space-md)}.wordmark{font:700 2.1rem/1 var(--font-body);letter-spacing:-.085em;display:inline-flex;align-items:center;gap:.4rem;white-space:nowrap}.brand-dot{display:inline-grid;place-content:center;width:24px;height:24px;background:var(--color-accent);color:var(--color-accent-ink);border-radius:50%;font-size:21px;letter-spacing:0}.edition{font-size:var(--text-sm);color:var(--color-muted);display:none}.nav-actions{display:flex;align-items:center;gap:var(--space-sm)}.nav-actions a,.nav-actions button{white-space:nowrap;min-height:44px;display:inline-flex;align-items:center;padding:.5rem .8rem;border:1px solid var(--color-rule);border-radius:var(--radius-sm);background:var(--color-transparent)}.nav-actions .language{border:0;padding:.5rem}.nav-actions .search-trigger{display:inline-flex;min-width:44px;justify-content:center}.search-label{display:none}.category-nav{display:flex;flex-wrap:wrap;gap:.1rem .7rem;border-top:1px solid var(--color-rule);margin-top:var(--space-lg);padding-top:.7rem}.category-nav a{font-size:var(--text-sm);white-space:nowrap;min-height:44px;display:flex;align-items:center;gap:.4rem}.category-nav a span{color:var(--color-muted);font-size:.7rem}.category-nav a[aria-current=page]{font-weight:700}.eyebrow{font-size:var(--text-sm);letter-spacing:.1em;text-transform:uppercase;display:flex;gap:.5rem;align-items:center}.eyebrow:before{content:'';width:6px;height:6px;background:var(--color-ink);border-radius:50%}.muted{color:var(--color-muted)}.home-intro{padding-block:var(--space-2xl);display:grid;gap:var(--space-xl)}.home-intro h1{margin-block:var(--space-md);max-width:14ch}.intro-copy{max-width:42ch;color:var(--color-muted)}.text-accent{position:relative;display:inline-block}.text-accent:after{content:'';height:7px;width:100%;position:absolute;bottom:1px;left:0;background:var(--color-accent);z-index:-1;transform:rotate(-2deg)}.hero-browse{margin-top:var(--space-lg)}.hero-note{font-size:var(--text-sm);display:flex;gap:1rem;margin-top:var(--space-xl);flex-wrap:wrap}.hero-note span{display:flex;gap:.35rem;align-items:center}.mini-demo{background:var(--color-dark);color:var(--color-paper);border-radius:var(--radius-lg);padding:var(--space-lg);align-self:center;position:relative}.mini-demo header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--color-chart-3);padding-bottom:var(--space-md);font-size:var(--text-sm)}.mini-demo header span{color:var(--color-dark-muted)}.demo-number{font-size:clamp(3rem,8vw,5.8rem);font-weight:300;letter-spacing:-.07em;line-height:1.15;margin-block:var(--space-xl) var(--space-sm);font-variant-numeric:tabular-nums}.demo-number small{font-size:1rem;color:var(--color-dark-muted);letter-spacing:0;margin-inline-start:.5rem}.mini-demo p{color:var(--color-dark-muted);font-size:var(--text-sm)}.mini-demo input{accent-color:var(--color-accent);width:100%;min-height:44px;margin-top:var(--space-lg)}.range-labels{display:flex;justify-content:space-between;font-size:var(--text-sm);color:var(--color-dark-muted)}.demo-track{height:12px;margin-top:var(--space-xl);background:var(--color-chart-3);border-radius:var(--radius-sm);overflow:clip}.demo-fill{height:100%;width:100%;background:var(--color-accent);transform:scaleX(.25);transform-origin:left;transition:transform var(--dur-normal) var(--ease-out)}.demo-bottom{margin-top:var(--space-lg);display:flex;justify-content:space-between;align-items:center;font-size:var(--text-sm)}.demo-bottom a{min-height:44px;display:flex;align-items:center;color:var(--color-accent)}.library{padding-block:var(--space-xl) var(--space-3xl);border-top:1px solid var(--color-rule)}.library-heading{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:var(--space-lg)}.library-heading .muted{font-size:var(--text-sm)}.search-wrap{position:relative;display:flex;align-items:center;gap:.7rem;background:var(--color-panel);border:1px solid var(--color-rule);border-radius:var(--radius-md);padding:.4rem .8rem}.search-wrap label{font-size:1.4rem}.search-wrap input{width:100%;min-width:0;min-height:48px;background:var(--color-transparent);border:0;outline-offset:0}.search-wrap kbd{border:1px solid var(--color-rule);padding:.05rem .4rem;border-radius:var(--radius-sm);color:var(--color-muted);font-family:var(--font-body)}.filter-row{display:flex;flex-wrap:wrap;gap:.5rem;padding-block:var(--space-lg)}.chip{border:1px solid var(--color-rule);background:var(--color-transparent);color:var(--color-ink);border-radius:var(--radius-sm);padding:.5rem .8rem;min-height:44px;white-space:nowrap;font-size:var(--text-sm)}.chip[aria-pressed=true]{background:var(--color-ink);color:var(--color-paper);border-color:var(--color-ink)}.directory{display:grid;gap:var(--space-2xl)}.group-heading{display:flex;align-items:center;gap:var(--space-md);margin-bottom:.8rem}.category-icon{width:44px;height:44px;display:grid;place-items:center;border-radius:var(--radius-md);font-size:1.5rem;background:var(--color-finance)}[data-category=health] .category-icon{background:var(--color-health)}[data-category=math] .category-icon{background:var(--color-math)}[data-category=everyday] .category-icon{background:var(--color-everyday)}.group-heading h2{font-family:var(--font-body);font-size:var(--text-md);font-weight:700;letter-spacing:-.025em}.group-heading small{font-size:var(--text-sm);color:var(--color-muted)}.tool-list{display:grid;grid-template-columns:minmax(0,1fr);gap:0}.tool-link{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--color-rule);min-height:64px;font-size:.95rem;transition:transform var(--dur-fast) var(--ease-out)}.tool-link span:first-child{min-width:0;overflow-wrap:anywhere}.tool-link .arrow{color:var(--color-muted);flex-shrink:0;transition:transform var(--dur-normal) var(--ease-out)}.tool-link[data-featured=true] span:first-child:after{content:' ↗';font-size:.8rem;color:var(--color-muted)}.no-results{padding:2rem 0}.no-results button{margin-top:1rem}.why{display:grid;gap:var(--space-xl);padding-block:var(--space-2xl);border-top:1px solid var(--color-rule)}.why p{max-width:65ch;color:var(--color-muted)}.why-points{display:grid;gap:var(--space-lg)}.why-points h3{font-size:1rem;margin-bottom:.5rem}.footer{border-top:1px solid var(--color-rule);padding-block:var(--space-2xl);display:flex;flex-wrap:wrap;gap:1.5rem;justify-content:space-between;align-items:center;font-size:var(--text-sm)}.footer .wordmark{font-size:1.6rem}.footer p{color:var(--color-muted)}.footer-links{display:flex;gap:1rem;flex-wrap:wrap}.footer-links a{display:flex;align-items:center;min-height:44px;white-space:nowrap}.breadcrumbs{display:flex;gap:.4rem .6rem;flex-wrap:wrap;font-size:var(--text-sm);color:var(--color-muted);padding-block:var(--space-lg)}.breadcrumbs a{min-height:44px;display:flex;align-items:center;white-space:nowrap}.breadcrumbs span{display:flex;align-items:center;min-width:0}.calc-heading{padding-block:var(--space-sm) var(--space-xl);display:grid;gap:var(--space-md)}.calc-heading h1{font-size:clamp(2.25rem,4.8vw,4rem);max-width:20ch}.calc-heading p{max-width:64ch;color:var(--color-muted)}.calc-layout{display:grid;gap:var(--space-lg);align-items:start}.input-panel{border:1px solid var(--color-rule);background:var(--color-panel);color:var(--color-ink);border-radius:var(--radius-lg);padding:var(--space-lg)}.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:var(--space-lg)}.panel-heading h2{font-family:var(--font-body);font-size:var(--text-base);font-weight:700;letter-spacing:0}.panel-heading span{font-size:var(--text-sm);color:var(--color-muted)}.fields{display:grid;gap:var(--space-md)}.field label{display:block;font-size:var(--text-sm);font-weight:600;margin-bottom:.5rem}.field-control{position:relative}.field input,.field select,.field textarea{width:100%;border:1px solid var(--color-rule);border-radius:var(--radius-sm);min-height:52px;padding:.7rem .8rem;background:var(--color-paper);color:var(--color-ink);font-variant-numeric:tabular-nums;min-width:0}.field input[aria-invalid=true]{border-color:var(--color-error)}.field textarea{resize:vertical;min-height:100px}.field input:disabled{opacity:.55;cursor:not-allowed}.field .unit{color:var(--color-muted);position:absolute;inset-inline-end:1rem;top:.8rem;pointer-events:none;font-size:var(--text-sm)}.field-control:has(.unit) input{padding-inline-end:4rem}.field-help{font-size:var(--text-sm);color:var(--color-muted);min-height:1.3em;margin-top:.25rem}.form-actions{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:var(--space-lg)}.button{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:.6rem;padding:.7rem 1rem;border:1px solid var(--color-rule);border-radius:var(--radius-sm);background:var(--color-panel);color:var(--color-ink);white-space:nowrap;font-size:.9rem;transition:transform var(--dur-fast) var(--ease-out),opacity var(--dur-fast) var(--ease-out)}.button.primary{background:var(--color-ink);color:var(--color-paper);border-color:var(--color-ink);flex:1}.button:active{transform:scale(.98)}.error{color:var(--color-error);font-size:var(--text-sm);margin-top:.6rem;min-height:1.4em}.results{background:var(--color-dark);color:var(--color-paper);border-radius:var(--radius-lg);padding:var(--space-lg);min-width:0}.result-heading{display:flex;justify-content:space-between;align-items:center;gap:.5rem;font-size:var(--text-sm)}.result-heading span{color:var(--color-dark-muted)}.favorite{border:1px solid var(--color-chart-3);border-radius:var(--radius-sm);background:var(--color-transparent);color:var(--color-paper);min-height:44px;min-width:44px;font-size:1.25rem}.favorite[aria-pressed=true]{color:var(--color-accent)}.result-value{font-size:clamp(2.6rem,6vw,4.5rem);letter-spacing:-.065em;font-weight:300;line-height:1.1;overflow-wrap:anywhere;min-width:0;font-variant-numeric:tabular-nums;margin-block:var(--space-xl) .5rem}.result-value.long{font-size:var(--text-xl);letter-spacing:-.03em}.result-unit{color:var(--color-dark-muted);font-size:var(--text-sm);min-height:1.5em}.result-label{font-size:var(--text-md);margin-top:.4rem}.result-details{margin-top:var(--space-xl)}.result-details div{display:flex;justify-content:space-between;gap:1rem;align-items:baseline;padding-block:.7rem;border-top:1px solid var(--color-chart-3);font-size:var(--text-sm)}.result-details dt{color:var(--color-dark-muted)}.result-details dd{margin:0;text-align:end;overflow-wrap:anywhere;max-width:65%;font-variant-numeric:tabular-nums}.result-note{color:var(--color-dark-muted);font-size:var(--text-sm);margin-top:var(--space-lg)}.result-tools{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:var(--space-lg)}.result-tools .button{background:var(--color-transparent);color:var(--color-paper);border-color:var(--color-chart-3);min-height:44px;font-size:var(--text-sm);padding:.5rem .7rem}.result-tools .button:first-child{background:var(--color-accent);color:var(--color-accent-ink);border-color:var(--color-accent)}.chart{margin-block:var(--space-xl);min-width:0}.chart svg{display:block;width:100%;height:120px;overflow:visible}.chart text{font-family:var(--font-body);fill:var(--color-dark-muted);font-size:10px}.chart rect{fill:var(--color-accent)}.chart .secondary{fill:var(--color-chart-2)}.chart path{fill:none;stroke:var(--color-accent);stroke-width:2.5}.chart circle{fill:var(--color-accent)}.chart-legend{display:flex;gap:.4rem 1rem;flex-wrap:wrap;font-size:.75rem;color:var(--color-dark-muted);margin-top:.5rem}.chart-legend span:before{content:'';display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--color-accent);margin-right:.4rem}.chart-legend span:nth-child(even):before{background:var(--color-chart-2)}.status{font-size:var(--text-sm);min-height:1.5em;margin-top:.7rem;color:var(--color-dark-muted)}.result-inner.updated{animation:result-in var(--dur-normal) var(--ease-out)}@keyframes result-in{from{opacity:.5;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.scenario{border:1px solid var(--color-rule);border-radius:var(--radius-md);padding:var(--space-lg);margin-top:var(--space-lg)}.scenario h2{font:700 1rem var(--font-body);margin-bottom:1rem}.scenario-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:1rem}.scenario-grid small{color:var(--color-muted)}.scenario-grid strong{display:block;overflow-wrap:anywhere;font-size:var(--text-md);font-weight:500}.scenario p{font-size:var(--text-sm);color:var(--color-muted);margin-top:1rem}.scenario .button{margin-top:1rem}.article-layout{display:grid;gap:var(--space-2xl);padding-block:var(--space-3xl)}.article section{border-top:1px solid var(--color-rule);padding-block:var(--space-xl)}.article h2{font-size:2rem;margin-bottom:var(--space-lg)}.article p{max-width:70ch}.article ol{padding-inline-start:1.3rem}.formula{display:block;padding:var(--space-lg);background:var(--color-soft);color:var(--color-ink);border-radius:var(--radius-sm);margin-block:var(--space-lg);white-space:pre-wrap;overflow-wrap:anywhere;font:var(--text-base)/1.6 var(--font-body)}.example{border-inline-start:3px solid var(--color-ink);padding-inline-start:var(--space-lg);margin-block:var(--space-lg)}.example small{display:block;font-size:var(--text-sm);font-weight:700;margin-bottom:.5rem}.article details{border-top:1px solid var(--color-rule);padding-block:.25rem}.article details:last-child{border-bottom:1px solid var(--color-rule)}.article summary{list-style:none;position:relative;font-weight:600;padding:1rem 2rem 1rem 0;cursor:pointer;min-height:52px}.article summary:after{content:'+';position:absolute;right:0;top:.8rem;font-size:1.4rem;font-weight:400}.article details[open] summary:after{content:'−'}.article details p{padding-bottom:1.1rem;color:var(--color-muted)}.related{padding-top:var(--space-xl);border-top:1px solid var(--color-rule)}.related h2{font-family:var(--font-body);font-size:var(--text-base);font-weight:700;letter-spacing:0}.related .tool-link{font-size:var(--text-sm)}.related p{font-size:var(--text-sm);color:var(--color-muted);margin-block:var(--space-lg)}.source-links{display:flex;flex-direction:column;gap:.5rem;font-size:var(--text-sm)}.source-links a{text-decoration:underline;text-underline-offset:3px}.legal{max-width:780px;padding-block:var(--space-3xl);min-height:60svh}.legal h1{font-size:3rem;margin-bottom:2rem}.legal h2{font:700 var(--text-md) var(--font-body);margin-block:2rem 1rem}.legal address{font-style:normal}.legal a{text-decoration:underline}.catalogue-intro{padding-block:var(--space-2xl)}.catalogue-intro p{margin-top:var(--space-md);max-width:65ch;color:var(--color-muted)}dialog{position:fixed;inset:0;margin:auto;width:min(620px,calc(100% - 2rem));max-height:80dvh;border:1px solid var(--color-rule);background:var(--color-paper);color:var(--color-ink);border-radius:var(--radius-lg);padding:var(--space-lg)}dialog::backdrop{background:var(--color-ink);opacity:.55}.dialog-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.dialog-heading h2{font-size:1.5rem}.dialog-search-results{max-height:50dvh;overflow:auto;margin-top:1rem}.dialog-search-results a{display:flex;justify-content:space-between;align-items:center;gap:1rem;min-height:52px;border-bottom:1px solid var(--color-rule);font-size:.9rem}.dialog-search-results a small{color:var(--color-muted)}[hidden]{display:none!important}
@media(hover:hover){.tool-link:hover{transform:translateX(4px);text-decoration:none}.tool-link:hover .arrow{transform:translateX(3px)}.button:hover{transform:translateY(-2px);text-decoration:none}.field input:hover,.field select:hover,.field textarea:hover{background:var(--color-soft);color:var(--color-ink)}}
@media(min-width:40rem){.search-label{display:inline}.edition{display:block}.nav-actions .search-trigger{display:inline-flex}.category-nav{gap:1.5rem}.home-intro{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);align-items:center;padding-block:var(--space-3xl)}.mini-demo{padding:var(--space-xl)}.directory{grid-template-columns:repeat(2,minmax(0,1fr));gap:2.5rem}.fields{grid-template-columns:repeat(2,minmax(0,1fr))}.field:has(textarea){grid-column:1/-1}.why-points{grid-template-columns:repeat(2,minmax(0,1fr))}.input-panel,.results{padding:var(--space-xl)}}
@media(min-width:60rem){.category-nav{justify-content:center}.mast-row{position:relative;justify-content:center}.mast-row .edition{position:absolute;inset-inline-start:0}.mast-row .nav-actions{position:absolute;inset-inline-end:0}.wordmark{font-size:2.4rem}.home-intro{gap:5rem}.directory{grid-template-columns:repeat(4,minmax(0,1fr));gap:2rem}.why{grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:4rem}.calc-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:var(--space-xl)}.article-layout{grid-template-columns:minmax(0,2.3fr) minmax(0,1fr);gap:5rem}.related{position:sticky;top:2rem;align-self:start}.calc-heading{padding-bottom:var(--space-2xl)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}
@media print{.masthead,.footer,.result-tools,.form-actions,.favorite,.related,.status,.scenario .button,.category-nav{display:none!important}.calc-layout{display:block}.results{background:var(--color-paper);color:var(--color-ink);border:1px solid var(--color-rule);margin-top:1rem}.result-unit,.result-note,.result-heading span,.result-details dt{color:var(--color-muted)}.chart{display:none}.article-layout{display:block}body{font-size:12px}h1{font-size:2rem}}
.calc-visual{margin:var(--space-xl) 0 var(--space-lg)}.calc-visual svg{display:block;width:100%;height:160px;overflow:visible}.calc-visual figcaption{font-size:.75rem;color:var(--color-dark-muted);text-align:center;margin-top:.5rem}.calc-visual text{font:12px var(--font-body);fill:var(--color-dark-muted);text-anchor:middle}.calc-visual .visual-center{font-size:25px;fill:var(--color-paper);font-weight:500}.visual-track{fill:none;stroke:var(--color-chart-3);stroke-width:12}.visual-progress{fill:none;stroke:var(--color-accent);stroke-width:12;stroke-linecap:round}.visual-shape{fill:var(--color-transparent);stroke:var(--color-accent);stroke-width:2}.visual-line{fill:none;stroke:var(--color-paper);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.visual-point,.visual-highlight{fill:var(--color-accent)}.visual-track-fill{fill:var(--color-chart-3)}
.calculator-keypad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.5rem;margin-top:var(--space-lg)}[data-calculator=scientific-calculator] .calculator-keypad{grid-template-columns:repeat(5,minmax(0,1fr))}.key{min-height:48px;border:1px solid var(--color-rule);border-radius:var(--radius-sm);background:var(--color-paper);color:var(--color-ink);font-size:1rem;transition:transform var(--dur-fast) var(--ease-out)}.key:active{transform:scale(.95)}.results{scroll-margin-top:var(--space-lg)}
.result-inner.updated .chart rect{transform-box:fill-box;transform-origin:bottom;animation:bar-rise var(--dur-enter) var(--ease-out) both}.result-inner.updated .chart rect:nth-child(2n){animation-delay:40ms}.result-inner.updated .chart rect:nth-child(3n){animation-delay:80ms}@keyframes bar-rise{from{transform:scaleY(.2);opacity:.3}to{transform:scaleY(1);opacity:1}}.article details[open] p{animation:answer-in var(--dur-normal) var(--ease-out)}@keyframes answer-in{from{opacity:0}to{opacity:1}}
@media(prefers-reduced-motion:reduce){.result-inner.updated .chart rect,.article details[open] p{animation:none}}

/* Hallmark · macrostructure: Sidebar Workbench · tone: modern-minimal · anchor hue: orange 40
 * User reference: white panels on cool grey, compact navigation, strong numeric hierarchy.
 * Hallmark · pre-emit critique: P4 H5 E4 S4 R5 V4 */
.desktop-sidebar{display:none}
body{background:var(--color-paper)}
h1,h2,h3,.result-value,.demo-number output{font-family:var(--font-display);font-style:normal}
h1{font-weight:700;letter-spacing:-.045em}
.wordmark{font-family:var(--font-body);font-weight:750;letter-spacing:-.06em}
.brand-dot{color:var(--color-accent)}
.masthead{background:var(--color-panel)}
.edition{font-size:.8125rem}
.calc-heading h1{font-size:clamp(2rem,4vw,3.1rem)}
.calc-heading{margin-bottom:2rem}
.calc-heading>p:last-child{max-width:760px}
.calc-layout{gap:1.5rem;align-items:start}
.input-panel,.results,.scenario,.mini-demo{background:var(--color-panel);color:var(--color-ink);border:1px solid var(--color-rule);border-radius:12px;box-shadow:none}
.input-panel,.results{padding:1.5rem}
.results{border-top:3px solid var(--color-accent);scroll-margin-top:1rem}
.panel-heading h2{font-size:1rem;font-weight:650}
.result-heading{color:var(--color-ink);align-items:center;padding-bottom:1rem;border-bottom:1px solid var(--color-rule)}
.result-heading>div{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}
.calculation-indicator{display:none;color:var(--color-accent);font-size:.6875rem;font-weight:650;letter-spacing:.01em}
.calculation-indicator.visible{display:inline-block}
.result-value{font-weight:800;font-size:clamp(3rem,6vw,4.5rem);letter-spacing:-.055em;line-height:1.12;margin-top:1.25rem;color:var(--color-ink);transform-origin:left center;font-variant-numeric:tabular-nums}
.result-value.long{font-weight:750;font-size:clamp(1.6rem,3.5vw,2.5rem);letter-spacing:-.025em}
.result-unit{color:var(--color-accent);font-weight:650;margin-top:.35rem}
.result-label{color:var(--color-muted);font-size:.9375rem}
.result-details dt,.result-note,.status,.chart-legend,.range-labels,.demo-bottom{color:var(--color-muted)}
.result-details dd{font-weight:700;color:var(--color-ink)}
.result-details>div,.result-tools,.demo-bottom{border-color:var(--color-rule)}
.results .button{border-color:var(--color-rule);color:var(--color-ink);background:var(--color-panel)}
.results .button:hover{background:var(--color-soft)}
.favorite{color:var(--color-accent)}
.favorite:hover{background:var(--color-accent-soft)}
.button{font-weight:600;border-radius:7px;transition:transform var(--dur-fast) var(--ease-out),background-color var(--dur-fast) var(--ease-out)}
.button.primary{background:var(--color-accent);color:var(--color-accent-ink);border-color:var(--color-accent)}
.button:active{transform:scale(.98)}
input,select,textarea{background:var(--color-panel);border-radius:7px}
input:focus,select:focus,textarea:focus{border-color:var(--color-focus)}
.tool-link:hover{background:var(--color-accent-soft);color:var(--color-accent)}
.tool-link[data-featured=true] span:first-child:after{content:none}
.arrow{display:none}
.category-icon{color:var(--color-accent)}
.chip[aria-pressed=true]{background:var(--color-accent-soft);color:var(--color-accent);border-color:var(--color-accent)}
.category-nav a[aria-current],.category-nav a:hover{color:var(--color-accent)}
.visual-line{stroke:var(--color-ink)}
.visual-center,.visual .visual-center{fill:var(--color-ink);font-weight:700}
.visual text{fill:var(--color-muted)}
.visual-track,.demo-track{stroke:var(--color-chart-track);background:var(--color-chart-track)}
.demo-number output{font-weight:800;letter-spacing:-.06em}
.mini-demo header,.mini-demo p{color:var(--color-ink)}
.demo-fill{background:var(--color-accent)}
.mini-demo a{color:var(--color-accent)}
.home-intro h1{font-size:clamp(2.4rem,4.2vw,4rem)}
.home-intro{gap:2.5rem;padding-block:3rem}
.text-accent{color:var(--color-accent);background:none}
.directory-group{background:var(--color-panel);border:1px solid var(--color-rule);border-radius:12px;padding:1.25rem}
.group-heading{border-bottom:1px solid var(--color-rule);padding-bottom:1rem}
.library{padding-top:1rem}
.related{background:var(--color-panel);border:1px solid var(--color-rule);border-radius:12px;padding:1.25rem;align-self:start}
.related .button{font-size:.8125rem}
.footer{margin-top:3rem}
@media(min-width:960px){
 body{padding-left:224px}
 .desktop-sidebar{display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;width:224px;padding:1.5rem 1rem 1rem;background:var(--color-panel);border-right:1px solid var(--color-rule);z-index:20;overflow-y:auto}
 .desktop-sidebar>.wordmark{font-size:1.8rem;padding:.1rem .65rem 1.25rem}
 .desktop-sidebar nav{display:flex;flex-direction:column;gap:.2rem}
 .sidebar-label{margin:1.4rem .65rem .6rem;font-size:.625rem;text-transform:uppercase;letter-spacing:.08em;color:var(--color-muted);font-weight:600}
 .desktop-sidebar nav a,.desktop-sidebar nav button{display:flex;align-items:center;gap:.65rem;min-height:40px;padding:.65rem;border:1px solid var(--color-transparent);border-radius:7px;color:var(--color-muted);background:var(--color-transparent);font:inherit;font-size:.8125rem;white-space:nowrap;text-decoration:none;text-align:left;cursor:pointer}
 .desktop-sidebar nav a:hover,.desktop-sidebar nav button:hover{color:var(--color-ink);background:var(--color-soft)}
 .desktop-sidebar nav a[aria-current]{color:var(--color-accent);background:var(--color-accent-soft);font-weight:600}
 .desktop-sidebar nav span{width:18px;text-align:center;font-size:1.05rem}
 .desktop-sidebar nav small{margin-left:auto;font-size:.625rem}
 .sidebar-bottom{margin-top:auto;padding:.9rem .65rem .2rem;font-size:.6875rem;color:var(--color-muted)}
 .sidebar-bottom p{margin:1.5rem 0 .75rem}
 .sidebar-bottom a{margin-right:.8rem}
 .masthead .wordmark,.category-nav{display:none}
 .mast-row{display:flex;justify-content:space-between;min-height:72px;padding-block:1rem}
 .shell{padding-inline:2rem;max-width:1320px}
 .calc-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
 .article-layout{grid-template-columns:minmax(0,1fr) 260px;gap:2rem}
 .directory{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.25rem}
}
@media(max-width:599px){.input-panel,.results{padding:1.25rem}.result-value{font-size:3.25rem}.home-intro{padding-block:2rem}.directory-group{padding:1rem}.calc-heading{margin-bottom:1.5rem}.result-heading>div{gap:.5rem}}
@media(prefers-reduced-motion:reduce){.button:active{transform:none}}
.brand-dot{color:var(--color-accent-ink)}
.calc-visual .visual-center{fill:var(--color-ink);font-weight:700}
.visual-track-fill{fill:var(--color-chart-track)}
.result-heading .calculation-indicator{color:var(--color-accent)}
.result-inner.updated{animation:none}
.text-accent:after{content:none}
.field input,.field select,.field textarea{background:var(--color-panel)}
input[type=number]{appearance:textfield;-moz-appearance:textfield}
input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
@media(min-width:960px){.masthead{padding-block:0}.edition{display:block}}
@media print{.desktop-sidebar{display:none!important}body{padding-left:0}}
/* Calculator workspace refinement: coherent icons, disclosure navigation and settings. */
.ui-icon{display:inline-block;width:22px;height:22px;flex:0 0 22px;vertical-align:middle}
.search-wrap label .ui-icon{width:22px;height:22px}
.search-trigger{gap:.55rem}
.sidebar-category summary,.sidebar-subcategory summary{display:flex;align-items:center;gap:.65rem;list-style:none;cursor:pointer;min-height:44px;font-size:.8125rem;color:var(--color-muted);padding:.65rem;border-radius:7px}
.sidebar-category summary::-webkit-details-marker,.sidebar-subcategory summary::-webkit-details-marker,.calculator-settings summary::-webkit-details-marker{display:none}
.sidebar-category[open]>summary{background:var(--color-accent-soft);color:var(--color-accent-button);font-weight:650}
.expand-mark{margin-left:auto;font-size:1.15rem;line-height:1}
.sidebar-category[open]>summary .expand-mark,.sidebar-subcategory[open]>summary .expand-mark{font-size:0}
.sidebar-category[open]>summary .expand-mark:after,.sidebar-subcategory[open]>summary .expand-mark:after{content:'−';font-size:1.15rem}
.desktop-sidebar nav .sidebar-overview{font-size:.75rem;padding-left:1rem;min-height:36px}
.sidebar-subcategory{margin-left:.4rem;border-left:1px solid var(--color-rule)}
.sidebar-subcategory summary{font-size:.75rem;padding-left:.7rem;line-height:1.4}
.desktop-sidebar nav .sidebar-subcategory a{white-space:normal;font-size:.75rem;min-height:36px;padding:.5rem .7rem .5rem 1rem;line-height:1.4}
.sidebar-subcategory summary:hover,.sidebar-category summary:hover{background:var(--color-soft)}
.sidebar-bottom p{line-height:1.6}
.button.primary{background:var(--color-accent-button);border-color:var(--color-accent-button)}
.text-accent,.category-icon,.result-unit,.favorite,.tool-link:hover,.calculation-indicator.visible,.chip[aria-pressed=true]{color:var(--color-accent-button)}
.brand-dot{background:var(--color-accent)}
.calculator-settings{margin-bottom:1.25rem;border:1px solid var(--color-rule);border-radius:7px;background:var(--color-panel)}
.calculator-settings summary{display:flex;align-items:center;gap:.65rem;list-style:none;min-height:44px;padding:.65rem .8rem;font-size:.8125rem;font-weight:600;cursor:pointer}
.calculator-settings[open] summary .expand-mark{font-size:0}
.calculator-settings[open] summary .expand-mark:after{content:'−';font-size:1.15rem}
[data-settings-controls]{padding:0 .8rem .8rem;display:grid;gap:.75rem}
[data-settings-controls] label{font-size:.8125rem;font-weight:600;display:grid;gap:.4rem}
[data-settings-controls] select{width:100%;min-height:44px;padding:.5rem;border:1px solid var(--color-rule);border-radius:6px}
[data-settings-controls] p{font-size:.75rem;line-height:1.6;color:var(--color-muted)}
.settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem}
.field-help:empty{display:none}
.result-unit:empty,.result-details:empty,.error:empty{display:none}
.result-details>div:has(dd:empty){display:none}
@media print{.calculator-settings{display:none}}
.chart .chart-zero{stroke:var(--color-rule);stroke-width:1}
.favorite[aria-pressed=true] .ui-icon{fill:var(--color-accent-soft);stroke:var(--color-accent-button)}
.desktop-sidebar nav .sidebar-subcategory a[aria-current]{color:var(--color-accent-button)}
.button.primary{background:var(--color-accent);border-color:var(--color-accent);color:var(--color-ink)}
.result-tools .button:first-child{color:var(--color-ink)}
.article,.related{min-width:0}
.article p,.source-links a{overflow-wrap:anywhere}
.desktop-sidebar nav .sidebar-overview{white-space:normal}
@media(max-width:599px){.panel-heading{align-items:start;flex-direction:column;gap:.25rem}}
/* Primary actions share one orange; secondary result actions stay neutral. */
.button.primary{background:var(--color-accent);border-color:var(--color-accent);color:var(--color-accent-ink);font-size:1.2rem;font-weight:700}
.text-accent{color:var(--color-accent)}
.result-tools .button:first-child{background:var(--color-panel);border-color:var(--color-rule);color:var(--color-ink)}
.result-tools .button:first-child:hover{background:var(--color-soft)}
.result-character{display:inline-block;white-space:pre;transform-origin:center bottom}
.language-menu{position:relative;flex:none}.language-menu>summary{list-style:none;cursor:pointer;min-width:44px;min-height:44px;display:grid;place-items:center;font-size:.8rem;font-weight:700;border:1px solid var(--color-rule);border-radius:10px;background:var(--color-panel)}.language-menu>summary::-webkit-details-marker{display:none}.language-menu nav{position:absolute;right:0;top:calc(100% + 8px);z-index:60;min-width:150px;padding:6px;border:1px solid var(--color-rule);border-radius:12px;background:var(--color-panel);box-shadow:0 12px 32px #0001}.language-menu .language{display:flex;align-items:center;min-height:44px;width:100%;padding:8px 12px;border:0;border-radius:7px}.language-menu .language:hover,.language-menu .language[aria-current=page]{background:var(--color-soft);color:var(--color-accent)}
/* Pocket calculator: tactile keys and a quiet display within the existing palette. */
.pocket{width:100%;max-width:420px;justify-self:center;padding:20px;border:1px solid var(--color-rule);border-radius:28px;background:var(--color-panel);box-shadow:0 18px 42px #18202b0c,0 3px 0 var(--color-rule);outline-offset:5px}
.pocket-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:.75rem;margin-bottom:16px}.pocket-top strong{font-size:1rem;letter-spacing:-.03em}.pocket-top strong span{color:var(--color-muted);font-weight:400}.pocket-top>span{color:var(--color-muted);text-align:right}
.pocket-display{background:var(--color-soft);border:1px solid var(--color-rule);border-radius:14px;padding:14px 16px;margin-bottom:14px;min-width:0;overflow:hidden;box-shadow:inset 0 2px 3px #18202b05}
.pocket-display-meta{height:22px;display:flex;justify-content:space-between;gap:8px;align-items:center;color:var(--color-muted);font-size:.75rem;white-space:nowrap;overflow:hidden}.pocket-display-meta>[data-pocket-expression]{margin-left:auto;overflow:hidden;text-overflow:ellipsis}
[data-pocket-display]{display:block;min-height:64px;text-align:right;font:600 3.5rem/1.15 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:-.05em;white-space:nowrap;color:var(--color-ink);font-variant-numeric:tabular-nums;padding-top:8px}
.pocket-grid,.pocket-memory{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.pocket-memory{margin-bottom:12px}.pocket-extra{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin-top:12px}
.pocket-key{min-height:52px;padding:7px;border:1px solid var(--color-rule);border-radius:12px;background:var(--color-paper);box-shadow:0 2px 0 var(--color-rule);font-size:1.2rem;font-weight:600;line-height:1.3;transition:background 140ms,box-shadow 140ms,transform 140ms;touch-action:manipulation}.pocket-memory .pocket-key,.pocket-extra .pocket-key{min-height:44px;font-size:.8125rem;font-weight:600;background:var(--color-panel);box-shadow:none}.pocket-key.utility{color:var(--color-muted)}.pocket-key.operator{background:var(--color-accent-soft);color:var(--color-ink)}.pocket-key.equals{background:var(--color-accent);border-color:var(--color-accent);color:var(--color-accent-ink);font-size:1.5rem;font-weight:700}
@media(hover:hover){.pocket-key:hover{background:var(--color-soft)}.pocket-key.equals:hover{background:var(--color-accent);box-shadow:0 2px 0 var(--color-rule),inset 0 0 0 2px #fff5}}
.pocket-key:focus-visible{outline:3px solid var(--color-focus);outline-offset:3px}.pocket-key:active{transform:translateY(2px);box-shadow:none}.pocket-key:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.pocket[data-state=error] .pocket-display{border-color:var(--color-error)}.pocket[data-state=error] [data-pocket-feedback]{color:var(--color-error)}.pocket[data-state=success] [data-pocket-feedback]{color:var(--color-ink);font-weight:600}
.pocket-bottom{margin-top:16px;display:flex;gap:10px;justify-content:space-between;align-items:start;font-size:.7rem;color:var(--color-muted)}.pocket-bottom>a{color:var(--color-ink);font-weight:600;text-decoration:underline;text-underline-offset:3px;white-space:nowrap}
.pocket-page{padding-block:36px}.pocket-page-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,420px);gap:clamp(32px,6vw,88px);align-items:start;margin-top:40px}.pocket-page h1{font-size:clamp(2.6rem,4vw,4.2rem);margin:16px 0 24px}.pocket-page .article{margin-top:40px}.pocket-page .article h2{font-size:1.4rem;margin:24px 0 12px}.pocket-large{position:sticky;top:24px}
@media(max-width:767px){.home-intro>.pocket{order:-1}.home-intro{padding-top:24px;gap:36px}.pocket-page-layout{display:flex;flex-direction:column}.pocket-page-layout>.pocket{order:-1;align-self:center;position:static}.pocket-page-layout>div{width:100%}}
@media(max-width:359px){.pocket{padding:14px;border-radius:22px}.pocket-grid,.pocket-memory,.pocket-extra{gap:7px}.pocket-bottom{flex-direction:column}.pocket-top{font-size:.7rem}}
@media(prefers-reduced-motion:reduce){.pocket-key{transition:none}}
.pocket-top{min-height:34px}.pocket-top>[data-pocket-feedback]{max-width:65%}[data-pocket-display]{font-weight:700}.pocket-key.operator[aria-pressed=true]{box-shadow:inset 0 0 0 2px var(--color-accent);background:var(--color-accent-soft)}