:root{--ink:#11293a;--muted:#526477;--navy:#102d43;--blue:#1260a7;--teal:#087f73;--line:#d6e1e6;--paper:#f5f8fa;--white:#fff;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--paper)}a{color:var(--blue);text-underline-offset:3px}a:hover{color:var(--teal)}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #b36910;outline-offset:4px}[hidden]{display:none!important}img{max-width:100%;height:auto}h1,h2,h3{line-height:1.2;letter-spacing:-.03em;color:var(--navy)}h1{font-size:clamp(2rem,4vw,3.35rem);margin:.4rem 0 1rem}h2{font-size:clamp(1.5rem,2.5vw,2.15rem);margin:0 0 1rem}h3{font-size:1.18rem;margin:0 0 .5rem}p{margin:0 0 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#cedde5;border-radius:18px;padding:23px;position:sticky;top:24px}.aside h2{font-size:1.05rem}.aside a{display:block;margin:12px 0;font-size:.9rem}.formula{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:17px;font-size:.87rem;white-space:pre-wrap;overflow-wrap:anywhere;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.8}.variables dt{font-weight:650;font-size:.93rem;margin-top:12px}.variables dd{margin:2px 0 0;color:var(--muted);font-size:.86rem}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;margin:18px 0;max-width:100%}table{border-collapse:collapse;width:100%;font-size:.88rem;text-align:left}th,td{padding:10px 13px;border-bottom:1px solid var(--line);vertical-align:top}th{font-weight:650;background:var(--paper)}tr:last-child td{border-bottom:0}.related-links{display:grid;grid-template-columns:1fr 1fr;gap:10px}.related-links a{padding:12px;background:var(--paper);border:1px solid var(--line);border-radius:10px;font-size:.87rem;text-decoration:none;line-height:1.4}.source-list{padding-left:20px}.source-list li{margin:12px 0}.source-list small{display:block;color:var(--muted);font-size:.79rem}.faq-item h3{font-size:1.06rem}.faq-item p{font-size:.94rem}.trust-block{background:var(--navy);border-radius:22px;padding:35px;color:#d9e8ed;display:grid;grid-template-columns:1fr 1fr;gap:40px}.trust-block h2{color:white}.trust-block a{color:#a8dcf6}.contact{max-width:650px}.contact label{display:block;font-weight:650;font-size:.9rem;margin:18px 0}.contact input,.contact textarea{margin-top:5px}.honeypot{position:absolute;left:-9999px}.status{padding:14px;border-radius:9px;background:#eaf4ef;color:#155c44;margin-top:16px}.footer{background:white;border-top:1px solid var(--line);padding:42px 0 20px}.footer-top{display:flex;justify-content:space-between;gap:22px;align-items:center;margin-bottom:30px}.footer-top p{margin:0;font-size:.83rem;color:var(--muted)}.footer-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:25px}.footer h2{font-size:.85rem;letter-spacing:0;margin:0 0 12px}.footer ul{padding:0;list-style:none;margin:0}.footer li{margin:8px 0}.footer a{color:var(--muted);font-size:.78rem;text-decoration:none}.footer a:hover{color:var(--blue);text-decoration:underline}.footer-bottom{border-top:1px solid var(--line);margin-top:28px;padding-top:18px;display:flex;justify-content:space-between;gap:20px;font-size:.74rem;color:var(--muted)}.not-found{padding:70px 0 100px;min-height:45vh}.reviewed{font-size:.77rem;color:var(--muted);margin:16px 0}.link-cta{background:#edf6f4;border:1px solid #c2ded7;border-radius:13px;padding:20px;margin:25px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(max-width:1000px){.nav{gap:18px}.category-grid{grid-template-columns:1fr 1fr}.hero-grid{gap:30px}.brand img{width:210px}.article-layout{grid-template-columns:minmax(0,1fr) 220px}.footer-grid{grid-template-columns:repeat(3,1fr)}.calc-shell{grid-template-columns:1fr 1fr}.fields{grid-template-columns:1fr}}
@media(max-width:760px){.container{width:calc(100% - 32px)}.header-inner{min-height:74px}.brand img{width:195px}.menu-button{display:block}.nav{display:none;position:absolute;left:0;right:0;top:74px;background:white;padding:20px 24px;border-bottom:1px solid var(--line);box-shadow:0 12px 20px #123b5310;flex-direction:column;align-items:start}.nav.open{display:flex}.hero{padding:40px 0}.hero-grid{grid-template-columns:1fr}.hero h1{font-size:2.7rem}.property-demo{transform:none;max-width:500px;width:100%;margin:0 auto}.demo-visual{height:140px}.hero-grid{gap:35px}.section{padding:36px 0}.grid{grid-template-columns:1fr 1fr}.section-heading{align-items:start;flex-direction:column;gap:12px}.directory{grid-template-columns:1fr;gap:16px}.filters{display:none;position:static}.filters.open{display:block}.filter-toggle{display:block}.directory .grid{grid-template-columns:1fr 1fr}.search-row{align-items:stretch;flex-wrap:wrap}.search-label{flex-basis:100%}.calc-shell{grid-template-columns:1fr;gap:20px}.fields{grid-template-columns:1fr 1fr}.result-panel{position:static}.calc-form,.article{padding:22px}.article-layout{grid-template-columns:1fr}.aside{position:static}.article h2{font-size:1.45rem}.trust-block{grid-template-columns:1fr;gap:20px;padding:25px}.footer-grid{grid-template-columns:1fr 1fr}.footer-top{align-items:start;flex-direction:column}.footer-bottom{flex-direction:column;gap:5px}.card{padding:18px}.hero-search{flex-direction:column}.hero-search input{width:100%}.hero-search button{width:100%}.related-links{grid-template-columns:1fr 1fr}}
@media(max-width:420px){.container{width:calc(100% - 28px)}.header-inner{gap:10px}.brand img{width:174px}.menu-button{padding:7px 10px;font-size:.82rem}.hero h1{font-size:2.35rem}.hero p{font-size:1rem}.grid,.directory .grid{grid-template-columns:1fr}.category-grid{gap:10px}.category-grid .card{padding:15px}.category-grid h3{font-size:1rem}.category-grid p{font-size:.8rem}.fields{grid-template-columns:1fr}.related-links{grid-template-columns:1fr}.result-panel{padding:22px}.result-row{gap:10px;flex-direction:column}.result-row dd{text-align:left}.footer-grid{gap:22px}.trust-strip{gap:8px 15px}.property-demo{padding:18px}.form-actions button{flex:1}.article{padding:20px}.primary-result{font-size:2rem}th,td{padding:9px 10px}.demo-stat strong{font-size:1.3rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Source values and captions remain readable at narrow widths. */
caption{text-align:left;padding:10px 13px;font-weight:650;background:#eaf1f5;color:var(--navy)}.table-wrap th{max-width:32em}.result-panel .unit{color:#c3d9e3}.trust-block h3{color:white}

@media(max-width:760px){.calc-shell .result-panel{grid-row:1}.calc-shell .calc-form{grid-row:2}}

.mobile-only{display:none!important}@media(max-width:760px){.mobile-only{display:inline-flex!important}}