:root{color-scheme:light;--color-page:#f7f8fa;--color-surface:#fff;--color-text:#111827;--color-text-secondary:#4b5563;--color-primary:#0057b8;--color-primary-hover:#004494;--color-border:#64748b;--color-border-subtle:#d1d5db;--color-success:#0b6b3a;--color-error:#b42318;--color-warning-bg:#fff4cc;--color-focus:#ffbf47;--color-ad-bg:#f3f4f6;--content-width:70rem;--text-width:45rem;--radius-card:.75rem}*,:before,:after{box-sizing:border-box}html{background:var(--color-page);min-width:20rem;color:var(--color-text);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}body{flex-direction:column;min-height:100vh;margin:0;display:flex}a{color:var(--color-primary);text-underline-offset:.16em}a:hover{color:var(--color-primary-hover)}:focus-visible{outline:3px solid var(--color-text);outline-offset:3px;box-shadow:0 0 0 5px var(--color-focus)}.skip-link{z-index:10;background:var(--color-surface);color:var(--color-text);border-radius:.25rem;padding:.75rem 1rem;font-weight:700;position:fixed;top:.75rem;left:.75rem;transform:translateY(-200%)}.skip-link:focus{transform:translateY(0)}.site-header{border-bottom:1px solid var(--color-border-subtle);background:var(--color-surface)}.site-header__inner,.site-footer__inner,.page-shell{width:min(100% - 2rem, var(--content-width));margin-inline:auto}.site-header__inner{align-items:center;min-height:3.5rem;display:flex}.wordmark{min-height:2.75rem;color:var(--color-text);letter-spacing:-.03em;align-items:center;font-size:1.35rem;font-weight:800;line-height:1;text-decoration:none;display:inline-flex}.wordmark__mark{align-items:center;display:inline-flex}.wordmark__icon{width:1.3em;height:1.3em;fill:var(--color-primary);flex:none;margin-right:.02em}.wordmark:hover .wordmark__icon{fill:var(--color-primary-hover)}.page-shell{flex:1;padding-block:clamp(3rem,8vw,6rem)}.intro{max-width:var(--text-width)}.intro--compact{max-width:38rem}.eyebrow{color:var(--color-primary);letter-spacing:.08em;text-transform:uppercase;margin:0 0 .75rem;font-size:.875rem;font-weight:800}h1{letter-spacing:-.035em;margin:0;font-size:clamp(2rem,8vw,3rem);line-height:1.1}h2,h3{color:var(--color-text);line-height:1.25}h2{letter-spacing:-.025em;margin:0 0 1rem;font-size:clamp(1.5rem,5vw,2rem)}h3{margin:0 0 .5rem;font-size:1.2rem}p{max-width:72ch}.intro__lead{max-width:38rem;color:var(--color-text-secondary);margin:1.25rem 0 0;font-size:clamp(1.0625rem,3vw,1.25rem)}.foundation-card{border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);gap:.25rem;margin-top:2rem;padding:1.25rem;display:grid}.foundation-card span{color:var(--color-text-secondary)}.button{background:var(--color-primary);color:#fff;border-radius:.375rem;align-items:center;min-height:3rem;margin-top:1.5rem;padding-inline:1.25rem;font-weight:700;text-decoration:none;display:inline-flex}.button:hover{background:var(--color-primary-hover);color:#fff}.site-footer{border-top:1px solid var(--color-border-subtle);background:var(--color-surface);color:var(--color-text-secondary)}.site-footer__inner{padding-block:1.5rem;font-size:.875rem}.site-footer p{margin:0}.desktop-nav{display:none}.site-menu{margin-left:auto;position:relative}.site-menu summary{border:1px solid var(--color-border);min-height:2.75rem;color:var(--color-text);cursor:pointer;border-radius:.375rem;align-items:center;padding-inline:.875rem;font-weight:700;display:inline-flex}.site-menu nav{z-index:5;border:1px solid var(--color-border);background:var(--color-surface);border-radius:.5rem;width:min(18rem,100vw - 2rem);padding:.5rem;display:grid;position:absolute;top:calc(100% + .5rem);right:0;box-shadow:0 .75rem 2rem #1118271f}.site-menu nav a,.desktop-nav a{min-height:2.75rem;color:var(--color-text);align-items:center;padding-inline:.75rem;font-weight:650;display:flex}.breadcrumbs{color:var(--color-text-secondary);margin-bottom:1.5rem;font-size:.875rem}.breadcrumbs ol{flex-wrap:wrap;gap:.4rem;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs li:not(:last-child):after{content:"/";margin-left:.4rem}.hero,.page-header{max-width:var(--text-width)}.hero{margin-bottom:2rem}.hero__lead,.page-header>p:last-child{color:var(--color-text-secondary);margin:1rem 0 0;font-size:clamp(1.0625rem,3vw,1.25rem)}.page-header{margin-bottom:2rem}.converter-shell{margin-block:2rem 3rem}.converter-card{border:2px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);padding:1.25rem}.converter-category{margin-bottom:1.25rem}.converter-category__label,.converter-category label,.converter-field>label{color:var(--color-text);margin-bottom:.4rem;font-weight:750;display:block}.converter-category__label{margin:0 0 .45rem}.category-tabs{z-index:1;overscroll-behavior-inline:contain;scrollbar-color:var(--color-border) transparent;scrollbar-width:thin;gap:.3rem;margin:0 0 -2px;padding:0;display:flex;position:relative;overflow-x:auto}.category-tabs button{border:2px solid var(--color-primary);background:var(--color-primary);color:#fff;min-height:2.75rem;font:inherit;cursor:pointer;border-radius:.375rem .375rem 0 0;flex:none;padding-inline:.9rem;font-weight:750}.category-tabs button:hover{border-color:var(--color-primary-hover);background:var(--color-primary-hover)}.category-tabs button[aria-pressed=true]{border-bottom-color:var(--color-surface);background:var(--color-surface);color:var(--color-primary-hover)}.converter-category-nav+.converter-card{border-top-left-radius:0}.converter-category select,.input-group input,.input-group select{border:2px solid var(--color-border);background:var(--color-surface);min-height:3.5rem;color:var(--color-text);font:inherit;border-radius:.375rem}.converter-category select{width:min(100%,24rem);padding-inline:.75rem}.converter-grid{gap:1rem;display:grid}.input-group{grid-template-columns:minmax(0,1fr) minmax(7rem,42%);min-width:0;display:grid}.input-group input{font-variant-numeric:tabular-nums lining-nums;border-radius:.375rem 0 0 .375rem;min-width:0;padding-inline:.75rem;font-size:clamp(1.25rem,6vw,1.65rem)}.input-group select{border-left:0;border-radius:0 .375rem .375rem 0;min-width:0;padding-inline:.5rem;font-size:.9375rem;font-weight:650}.field-error{min-height:1.5rem;color:var(--color-error);margin:.35rem 0 0;font-size:.875rem;font-weight:650}.rounding-option{width:fit-content;min-height:2.75rem;color:var(--color-text);cursor:pointer;align-items:center;gap:.65rem;margin-top:.75rem;font-weight:700;display:inline-flex}.rounding-option input{width:1.25rem;height:1.25rem;accent-color:var(--color-primary);margin:0}.swap-button,.primary-button,.secondary-button{min-height:3rem;font:inherit;cursor:pointer;border-radius:.375rem;font-weight:750}.swap-button{border:2px solid var(--color-primary);background:var(--color-surface);min-width:6.5rem;color:var(--color-primary);justify-content:center;justify-self:center;align-items:center;gap:.45rem;padding-inline:1rem;display:inline-flex}.swap-button span[aria-hidden=true]{font-size:1.35rem}.primary-button{border:2px solid var(--color-primary);background:var(--color-primary);color:#fff;padding-inline:1.25rem}.primary-button:hover{border-color:var(--color-primary-hover);background:var(--color-primary-hover)}.secondary-button{border:2px solid var(--color-primary);background:var(--color-surface);color:var(--color-primary);padding-inline:1.25rem}.secondary-button:hover,.swap-button:hover{color:var(--color-primary-hover);background:#eaf3ff}.converter-footer{align-items:center;gap:.75rem;margin-top:1rem;display:grid}.converter-result{flex-wrap:wrap;align-items:baseline;gap:.5rem;min-height:3rem;margin:0;display:flex}.converter-result span{color:var(--color-text-secondary);text-transform:uppercase;font-size:.875rem;font-weight:700}.converter-result strong{font-variant-numeric:tabular-nums lining-nums;font-size:clamp(1.5rem,7vw,2.25rem);line-height:1.15}.copy-status{min-height:1.5rem;color:var(--color-success);font-weight:700}.content-section,.popular-section,.explanation-grid,.source-note{margin-block:3rem}.popular-section{gap:2.5rem;display:grid}.link-grid{gap:.65rem;margin:0;padding:0;list-style:none;display:grid}.link-grid a{border:1px solid var(--color-border-subtle);background:var(--color-surface);border-radius:.375rem;align-items:center;min-height:2.75rem;padding:.75rem;font-weight:650;display:flex}.category-grid,.unit-list,.unit-explanations,.article-card-grid{gap:1rem;display:grid}.category-card,.unit-list article,.unit-explanations article{border:1px solid var(--color-border-subtle);border-radius:var(--radius-card);background:var(--color-surface);padding:1.25rem}.category-card{color:var(--color-text);text-decoration:none}.category-card:hover{border-color:var(--color-primary);color:var(--color-text)}.category-card p,.unit-list p,.unit-explanations p{color:var(--color-text-secondary);margin:.5rem 0}.category-card span{color:var(--color-primary);font-weight:750;text-decoration:underline}.article-index-header{max-width:42rem}.article-card{border:1px solid var(--color-border-subtle);border-radius:var(--radius-card);background:var(--color-surface);padding:1.25rem}.article-card .eyebrow{margin-bottom:.5rem}.article-card h3{margin-bottom:.75rem}.article-card p:last-child{color:var(--color-text-secondary);margin:0}.article-page{max-width:100%}.article-header{max-width:var(--text-width);margin-bottom:2rem}.article-answer{max-width:42rem;color:var(--color-text-secondary);margin:1.25rem 0 0;font-size:clamp(1.125rem,3vw,1.25rem);line-height:1.6}.article-content-grid{align-items:start;gap:2rem;display:grid}.article-main{min-width:0;max-width:var(--text-width)}.article-formula{border-left:.35rem solid var(--color-primary);border-radius:0 var(--radius-card) var(--radius-card) 0;background:#eaf3ff;margin-bottom:2rem;padding:1.25rem}.article-formula h2{color:var(--color-text-secondary);letter-spacing:.06em;text-transform:uppercase;margin:0;font-size:.875rem}.article-formula p{color:var(--color-text);font-variant-numeric:tabular-nums lining-nums;margin:.5rem 0 0;font-size:clamp(1.25rem,4vw,1.5rem);font-weight:800}.article-figure{margin:0 0 2.5rem}.article-figure img{border:1px solid var(--color-border-subtle);border-radius:var(--radius-card);background:var(--color-page);width:100%;height:auto;display:block}.article-figure figcaption{color:var(--color-text-secondary);margin-top:.65rem;font-size:.875rem}.article-prose{font-size:clamp(1.0625rem,2vw,1.125rem)}.article-prose h2{margin-top:2.75rem}.article-prose h2:first-child{margin-top:0}.article-prose p,.article-prose li{max-width:68ch}.article-prose li+li{margin-top:.6rem}.article-prose pre{border:1px solid var(--color-border-subtle);background:var(--color-surface);max-width:100%;color:var(--color-text);font-variant-numeric:tabular-nums lining-nums;white-space:pre-wrap;border-radius:.5rem;padding:1rem;font-size:1.05rem;overflow-x:auto}.article-category-cta{border:1px solid var(--color-border-subtle);border-radius:var(--radius-card);background:var(--color-surface);padding:1.25rem}.article-category-cta h2{font-size:1.4rem}.article-category-cta p:not(.eyebrow){color:var(--color-text-secondary)}.article-category-cta .button{text-align:center;justify-content:center;width:100%;min-height:3.25rem}.article-related{max-width:var(--text-width);margin-block:3rem}.article-review-note{max-width:var(--text-width)}.article-review-note ul{margin:.35rem 0 0;padding-left:1.25rem}.formula-box{border-left:.35rem solid var(--color-primary);background:#eaf3ff;margin-block:1rem 1.5rem;padding:1rem}.formula-box span,.formula-box strong{display:block}.formula-box span{color:var(--color-text-secondary);text-transform:uppercase;font-size:.8rem;font-weight:750}.formula-box strong{font-variant-numeric:tabular-nums;margin-top:.25rem;font-size:1.15rem}.worked-example strong{margin-left:.35rem}.ad-slot{border:1px solid var(--color-border-subtle);background:var(--color-ad-bg);min-height:15.625rem;color:var(--color-text-secondary);text-align:center;align-content:center;place-items:center;gap:.35rem;margin-block:3rem;display:grid;overflow:hidden}.ad-slot--secondary{min-height:6.25rem}.ad-slot__label{letter-spacing:.06em;text-transform:uppercase;font-size:.75rem}.ad-slot__disabled{font-size:.8125rem}.adsbygoogle{width:100%;min-height:inherit}.table-scroll{border:1px solid var(--color-border-subtle);background:var(--color-surface);border-radius:.5rem;overflow-x:auto}table{border-collapse:collapse;font-variant-numeric:tabular-nums lining-nums;width:100%;font-size:.9375rem}th,td{border-bottom:1px solid var(--color-border-subtle);padding:.75rem}th{text-align:left;background:#eef1f5}td{text-align:right}th:first-child,td:first-child{text-align:left}tbody tr:nth-child(2n){background:#fafafa}tbody tr:last-child td{border-bottom:0}.prose{max-width:var(--text-width)}.prose li+li{margin-top:.5rem}.source-note{border-top:1px solid var(--color-border-subtle);color:var(--color-text-secondary);padding-top:1.5rem;font-size:.875rem}.source-note p{margin:.35rem 0}.site-footer__inner{gap:1.5rem;display:grid}.site-footer__inner>div p{margin-top:.5rem}.site-footer__address,.contact-details{color:var(--color-text-secondary);font-style:normal}.site-footer__address{margin-top:.5rem}.site-footer nav{align-content:start;gap:.35rem;display:grid}.site-footer nav a,.link-button{align-items:center;min-height:2.75rem;display:inline-flex}.link-button{width:fit-content;color:var(--color-primary);font:inherit;text-underline-offset:.16em;cursor:pointer;background:0 0;border:0;padding:0;text-decoration:underline}.privacy-dialog{border:2px solid var(--color-border);border-radius:var(--radius-card);width:min(34rem,100% - 2rem);color:var(--color-text);padding:1.5rem}.privacy-dialog::backdrop{background:#111827b3}.privacy-dialog__status{min-height:1.5rem;color:var(--color-success);font-weight:700}.privacy-dialog__actions{flex-wrap:wrap;gap:.75rem;display:flex}@media (width>=40rem){.site-header__inner,.site-footer__inner,.page-shell{width:min(100% - 3rem, var(--content-width))}.site-header__inner{min-height:4rem}.foundation-card{padding:1.5rem}.converter-card{padding:1.75rem}.converter-footer{grid-template-columns:minmax(0,1fr) auto}.copy-status{grid-column:1/-1}.popular-section,.category-grid,.unit-list,.unit-explanations,.article-card-grid,.link-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.site-footer__inner{grid-template-columns:minmax(0,1fr) minmax(15rem,.6fr)}}@media (width>=56.25rem){.site-menu{display:none}.desktop-nav{gap:.25rem;margin-left:auto;display:flex}.converter-grid{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:start}.swap-button{margin-top:1.9rem}.explanation-grid{grid-template-columns:minmax(0,1fr) 20rem;align-items:start;gap:2rem;display:grid}.explanation-grid .content-section,.explanation-grid .ad-slot{margin-block:0}.category-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.article-content-grid{grid-template-columns:minmax(0, var(--text-width)) minmax(16rem, 20rem);gap:2.5rem}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}