:root{--ink:#28233d;--muted:#696476;--paper:#f8f7f2;--line:#dedbdc;--purple:#6852a5;--purple-pale:#eeeaf7;--yellow:#e8f090;--white:#fff;--error:#a52d38}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.6}a{color:inherit;text-underline-offset:4px}button,input,select,textarea{font:inherit}button,a,input,select,summary,textarea{-webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}button,input,select,textarea{border:1px solid var(--line);border-radius:8px}button{background:#fff;min-height:48px;padding:10px 18px;color:var(--ink);font-weight:700}button:hover{border-color:var(--purple);background:var(--purple-pale)}button:disabled{opacity:.45;cursor:not-allowed}button:disabled:hover{background:inherit}input,select,textarea{width:100%;min-height:50px;padding:11px 13px;background:#fff;color:var(--ink)}input:focus-visible,select:focus-visible,textarea:focus-visible,button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #9476dd;outline-offset:3px}input[aria-invalid=true]{border-color:var(--error)}label{display:block;font-size:13px;font-weight:700;margin-bottom:6px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(40px,5.6vw,68px);letter-spacing:-3px;line-height:1.08;margin-bottom:18px;font-weight:700}h2{font-size:30px;line-height:1.2;letter-spacing:-.8px}h3{font-size:18px;line-height:1.4}fieldset{border:0;padding:0;margin:22px 0}legend{font-size:12px;color:var(--purple);font-weight:700;padding:0;margin-bottom:14px}legend span{color:var(--ink);font-size:16px;margin-left:8px}main{max-width:1160px;margin:auto;padding:0 36px}.site-header{max-width:1232px;margin:auto;display:flex;justify-content:space-between;align-items:center;padding:26px 36px;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;align-items:center;gap:13px;font-weight:700;font-size:18px;text-decoration:none;letter-spacing:-.5px}.brand-icon{background:var(--ink);color:var(--white);font-size:14px;padding:7px 8px;border-radius:9px;letter-spacing:-1px}.brand-icon span{color:var(--yellow);padding:0 2px}.brand-domain{color:var(--muted);font-weight:400}.site-header nav{display:flex;gap:28px;font-size:13px;font-weight:700}.site-header nav a{text-decoration:none;min-height:48px;display:flex;align-items:center}.intro{display:flex;justify-content:space-between;align-items:center;padding:45px 0 29px;gap:20px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;margin:0 0 15px}.eyebrow>span{display:inline-block;width:7px;height:7px;border-radius:100%;background:var(--purple);margin-right:7px}.title-dot{color:var(--purple)}.lede{color:var(--muted);font-size:16px;line-height:1.6;margin-bottom:0}.intro-note{min-width:210px;padding:20px 26px;border-left:1px solid var(--line);text-align:center;transform:rotate(-3deg)}.intro-note span{font-size:10px;letter-spacing:1px;text-transform:uppercase;display:block;color:var(--muted)}.intro-note strong{font:46px Georgia,serif;display:block;padding:6px 0}.intro-note i{color:var(--purple);font-style:normal;font-size:30px}.calculator{display:grid;grid-template-columns:1.12fr 1fr;background:white;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 10px 28px #28233d06}.input-panel{padding:28px}.section-line{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:20px}.section-line h2{font-size:20px;margin:0}.badge{font-size:9px;letter-spacing:.8px;color:var(--muted);white-space:nowrap}.switch{display:grid;grid-template-columns:1fr 1fr;background:var(--paper);border-radius:8px;border:1px solid var(--line);padding:4px;gap:3px}.switch button{border:0;background:transparent;font-size:13px;min-height:43px;padding:8px}.switch button.active{background:var(--ink);color:#fff;box-shadow:0 2px 4px #28233d18}.radio-row{display:flex;gap:18px;flex-wrap:wrap;margin:0 0 15px}.radio-row label{display:flex;align-items:center;gap:6px;min-height:28px;font-size:12px;font-weight:400;margin:0}.radio-row input{accent-color:var(--purple);width:17px;height:17px;min-height:17px;padding:0}.formula-input{font-family:ui-monospace,Consolas,monospace;font-size:23px;font-weight:500}.hint{font-size:12px;line-height:1.6;color:var(--muted);margin:7px 0 12px}.quick-compounds{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}.quick-compounds button{padding:6px 12px;min-height:38px;font-size:11px;border-radius:25px;background:var(--paper)}#compound{font-size:12px;min-height:43px}.formula-status{font-size:12px;color:var(--purple);margin:9px 0 0;overflow-wrap:anywhere}.unit-label{float:right;color:var(--muted)}.quantity-row{display:flex;gap:10px}.grow{flex:1;min-width:0}.quantity-row input{font-size:22px;font-weight:700}.unit-field{width:165px}.unit-field select{font-size:13px;min-height:59px}.options-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}.options-row select{font-size:12px}.calculate-button{display:flex;align-items:center;justify-content:space-between;width:100%;background:var(--ink);color:#fff;font-size:14px;margin-top:8px}.calculate-button:hover{background:#453861;color:#fff}.calculate-button span{font-size:22px}.error{font-size:13px;color:var(--error);padding:10px 12px;background:#fff0f1;border-radius:6px;line-height:1.5}.result-panel{background:var(--ink);color:#fff;padding:28px 32px;display:flex;flex-direction:column;min-width:0}.result-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:38px}.light{color:#d7cee8;margin:0}.reset-button{font-size:11px;color:#d7cee8;background:transparent;border-color:#625a75;min-height:34px;padding:5px 12px}.reset-button:hover{color:var(--ink)}.result-context{font-size:14px;color:#ded7eb;margin-bottom:13px;overflow-wrap:anywhere}.result-number{font-size:clamp(32px,4.4vw,56px);line-height:1.1;letter-spacing:-2px;margin-bottom:15px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.result-number span:last-child{display:inline-block;font:24px Georgia,serif;color:var(--yellow);letter-spacing:0}.result-alternate{font-size:12px;color:#cfc4e1;overflow-wrap:anywhere}.result-rule{height:1px;background:#504660;margin:21px 0}.molar-line{display:flex;gap:12px;justify-content:space-between;font-size:12px}.molar-line span{color:#cfc4e1}.molar-line strong{font-weight:500}.working{margin:31px 0 24px;padding:20px;background:#ffffff08;border:1px solid #514760;border-radius:8px}.working h3{text-transform:uppercase;font-size:10px;letter-spacing:1.5px;color:var(--yellow);margin-bottom:14px}.working p{font-size:13px;margin:6px 0;overflow-wrap:anywhere}.working p:nth-last-child(2){font-family:ui-monospace,Consolas,monospace;color:#cec4df}.working p:last-child{font-size:17px}.result-actions{display:flex;gap:10px;margin-top:auto}.result-actions button{color:#fff;background:transparent;border-color:#716783;font-size:12px}.result-actions button:hover{background:#4d4168}.action-status{font-size:12px;color:var(--yellow);min-height:20px;margin:8px 0 0}.precision-note{font-size:11px;line-height:1.7;color:#c0b6d1;max-width:330px;margin:7px 0 0}.breakdown-section{margin-top:34px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:25px 28px}.breakdown-section .eyebrow{font-size:9px;color:var(--purple);margin-bottom:9px}.breakdown-section .section-line h2{font-size:23px}.small-note{font-size:11px;color:var(--muted);line-height:1.5}.table-scroll{width:100%;overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13px;text-align:left}th{font-size:10px;letter-spacing:.5px;color:var(--muted);font-weight:700;border-bottom:1px solid var(--line);padding:12px 8px;white-space:nowrap}td{padding:12px 8px;border-bottom:1px solid #eeecef;font-variant-numeric:tabular-nums}td:first-child{font-family:ui-monospace,Consolas,monospace;font-weight:700;font-size:17px}td:last-child{min-width:115px;white-space:nowrap}meter{width:60px;height:8px;margin-left:10px;vertical-align:middle;border:0}meter::-webkit-meter-bar{background:var(--purple-pale);border:0}meter::-webkit-meter-optimum-value{background:var(--purple)}.batch-section{margin-top:18px}.batch-section details{border:1px solid var(--line);background:#fff;border-radius:12px}.batch-section summary{display:flex;justify-content:space-between;align-items:center;padding:22px 28px;list-style:none}.batch-section summary::-webkit-details-marker{display:none}.batch-section summary .eyebrow{display:block;font-size:9px;color:var(--purple);margin:0 0 6px}.batch-section summary strong{font-size:21px;letter-spacing:-.5px}.summary-icon{font-size:28px;color:var(--purple)}details[open] .summary-icon{transform:rotate(45deg)}.batch-content{padding:0 28px 28px}.batch-content>p{font-size:13px;color:var(--muted);max-width:660px}.batch-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.batch-actions button{font-size:12px}.batch-actions .primary-small{background:var(--purple);color:#fff}.batch-content textarea{font-family:ui-monospace,Consolas,monospace}.editorial{display:grid;grid-template-columns:1fr 1.5fr;gap:70px;padding:78px 0 48px}.editorial-heading{position:relative}.editorial-heading h2{font:39px/1.18 Georgia,serif;letter-spacing:-1.5px}.editorial-heading .eyebrow{color:var(--purple)}.editorial-copy>p{font-size:14px;color:#5f586b;line-height:1.8}.editorial-copy .large-copy{font-size:20px;line-height:1.55;color:var(--ink);margin-bottom:25px}.editorial-copy h3{margin-top:28px}.formula-card{background:var(--purple-pale);padding:23px;border-radius:8px;margin:24px 0;display:grid;grid-template-columns:1fr 1.6fr;gap:15px 10px;align-items:center}.formula-card span{font-size:9px;letter-spacing:1px;color:var(--purple)}.formula-card strong{font-size:16px}.reference-examples{padding:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.example-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.example-grid button{display:flex;flex-direction:column;align-items:start;gap:10px;padding:20px;text-align:left}.example-grid button span{font-size:11px;color:var(--muted);font-weight:400}.example-grid strong{font:26px Georgia,serif;line-height:1.2}.faq{max-width:820px;padding:60px 0}.faq .eyebrow{color:var(--purple)}.faq h2{font:38px Georgia,serif}.faq details{border-bottom:1px solid var(--line)}.faq summary{padding:20px 28px 20px 0;font-weight:700;font-size:14px}.faq details p{font-size:14px;color:var(--muted);line-height:1.8;margin-bottom:23px}.about{background:var(--yellow);border-radius:12px;padding:38px 44px;display:grid;grid-template-columns:1fr 1.2fr;gap:0 55px}.about .eyebrow{grid-column:1/-1;margin-bottom:18px}.about h2{grid-row:2/4;font:43px/1.1 Georgia,serif;letter-spacing:-1.5px}.about p:not(.eyebrow){font-size:14px;line-height:1.8}.sources{padding:40px 0 45px;font-size:12px;color:var(--muted)}.sources h2{font-size:15px;color:var(--ink)}.sources ul{padding-left:18px}.sources li{margin:9px 0}.sources a{color:var(--ink)}footer{max-width:1232px;margin:auto;padding:26px 36px 38px;border-top:1px solid var(--line);display:flex;gap:25px;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted)}footer a{text-decoration:none}.footer-brand{font-weight:700;color:var(--ink);font-size:14px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:absolute;top:-100px;left:10px;background:#fff;padding:12px;z-index:100}.skip:focus{top:10px}.notice{background:var(--yellow);padding:20px;border-radius:8px}[hidden]{display:none!important}
@media(min-width:1000px){.input-panel{padding:28px 32px}.result-panel{padding:28px 38px}.result-number{font-size:53px}}@media(max-width:800px){main{padding:0 22px}.site-header{padding:20px 22px}.site-header nav{gap:18px}.intro{padding-top:30px}.intro-note{min-width:145px;padding:15px}.intro-note strong{font-size:33px}.calculator{grid-template-columns:1fr 1fr}.input-panel{padding:22px}.result-panel{padding:24px}.unit-field{width:115px}.unit-field select{font-size:11px}.options-row{grid-template-columns:1fr}.result-number{font-size:36px}.section-line{gap:12px}.badge{font-size:8px}.radio-row{gap:7px}.editorial{gap:35px}.editorial-heading h2{font-size:32px}.formula-card{grid-template-columns:1fr}.about{padding:30px;gap:0 25px}.about h2{font-size:35px}.example-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){main{padding:0 16px}.site-header{padding:14px 16px}.brand{font-size:15px;gap:9px}.brand-icon{font-size:12px}.site-header nav a{font-size:11px}.site-header nav a:last-child{display:none}.intro{padding:26px 2px 25px}.eyebrow{font-size:9px;letter-spacing:1.6px}.intro h1{font-size:43px;letter-spacing:-2px;margin-bottom:13px}.lede{font-size:14px}.intro-note{display:none}.wide-only{display:none}.calculator{grid-template-columns:1fr;border-radius:12px}.input-panel{padding:20px}.section-line h2{font-size:18px}.result-panel{padding:25px}.result-top{margin-bottom:22px}.result-number{font-size:48px}.result-rule{margin:17px 0}.working{margin:21px 0}.result-actions{margin-top:0}.precision-note{max-width:none}.quantity-row input{font-size:21px}.unit-field{width:135px}.unit-field select{font-size:12px}.options-row{grid-template-columns:1fr 1fr;gap:8px}.options-row select{font-size:11px;padding:10px 8px}.options-row label{font-size:11px}.radio-row{gap:14px}.breakdown-section{padding:21px 18px;margin-top:20px}.breakdown-section .section-line{display:block}.breakdown-section .section-line h2{font-size:23px;margin-bottom:10px}.breakdown-section td,.breakdown-section th{padding:10px 7px}.breakdown-section th{font-size:9px}.breakdown-section td{font-size:12px}.batch-section summary{padding:20px}.batch-content{padding:0 20px 20px}.batch-actions button{flex:1;white-space:nowrap}.editorial{display:block;padding:48px 2px 30px}.editorial-heading h2{font-size:35px;max-width:350px}.editorial-heading h2 br{display:none}.editorial-copy .large-copy{font-size:18px}.formula-card{grid-template-columns:1fr 1.5fr;padding:18px;gap:15px 8px}.formula-card strong{font-size:14px}.formula-card span{font-size:8px}.reference-examples .section-line{align-items:flex-start}.reference-examples h2{max-width:220px;font-size:20px}.example-grid{gap:10px}.example-grid button{padding:17px}.faq{padding:45px 2px}.faq h2{font-size:32px}.about{padding:28px 25px;display:block}.about h2{font-size:36px;margin-bottom:25px}.sources{padding:32px 2px}footer{padding:24px 18px;flex-wrap:wrap;gap:10px 20px}footer span{width:100%;order:3}.skip{font-size:13px}h2{font-size:26px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{body{background:white;color:#000}header,nav,.intro-note,.batch-section,.editorial,.reference-examples,.faq,.about,.sources,footer,.calculate-button,.result-actions,.reset-button,.quick-compounds,#compound,.skip{display:none!important}main{max-width:none;padding:0}.intro{padding:10px 0}.intro h1{font-size:30px}.calculator{display:grid;grid-template-columns:1fr 1fr;box-shadow:none;break-inside:avoid}.result-panel{background:#fff;color:#000;border-left:1px solid #aaa}.result-panel p,.result-panel span,.result-panel strong{color:#000}.working{border-color:#bbb}.result-number{font-size:31px}.breakdown-section{break-inside:avoid}.input-panel,.result-panel{padding:18px}.options-row{grid-template-columns:1fr 1fr}.action-status{display:none}.breakdown-section .hint{font-size:10px}}

@media screen {button, .radio-row label {min-height:48px!important}}

/* Static information pages and site-wide support navigation. */
.site-footer{flex-wrap:wrap;gap:14px 26px}.footer-identity{min-width:0}.footer-identity p{margin:6px 0 0;font-size:11px}.site-footer .footer-links{display:flex;flex-wrap:wrap;gap:0 22px;margin:0 0 0 auto;font-size:12px;align-items:center}.site-footer .footer-links a,.footer-converter{display:inline-flex;align-items:center;min-height:44px}.site-footer .footer-links a[aria-current="page"]{color:var(--purple);text-decoration:underline;text-decoration-thickness:2px}.footer-converter{font-size:11px}.info-main{max-width:850px;padding-top:54px;padding-bottom:64px;min-height:65vh}.info-heading{border-bottom:1px solid var(--line);padding-bottom:27px;margin-bottom:30px}.info-heading .eyebrow{color:var(--purple);margin-bottom:18px}.info-heading h1{font-family:Georgia,serif;font-weight:400;font-size:clamp(36px,5vw,52px);letter-spacing:-1.6px;line-height:1.13;margin-bottom:20px}.info-lede{color:var(--muted);font-size:19px;line-height:1.6;max-width:680px;margin-bottom:0}.info-date{font-size:12px;color:var(--muted);margin:20px 0 0}.info-copy{font-size:16px;line-height:1.85;overflow-wrap:anywhere}.info-copy p{margin-bottom:20px}.info-copy h2{font-size:23px;line-height:1.35;letter-spacing:-.4px;margin:34px 0 13px}.info-copy h2:first-child{margin-top:0}.info-copy a{color:var(--purple)}.contact-card{padding:26px 28px;border:1px solid var(--line);background:var(--purple-pale);border-radius:12px;margin-bottom:34px}.contact-card .contact-label{font-size:12px;letter-spacing:.5px;font-weight:700;margin-bottom:8px}.contact-card .contact-email{display:inline-block;max-width:100%;padding:6px 0;font-size:clamp(19px,3.5vw,28px);font-weight:700;line-height:1.4;overflow-wrap:anywhere}.contact-card p:last-child{margin:12px 0 0;font-size:13px;color:var(--muted)}.info-return{margin-top:28px}.info-return a{display:inline-flex;align-items:center;min-height:48px;font-weight:700}.info-page .site-header nav a{display:flex}.info-page .site-header nav{margin-left:auto}
@media(max-width:620px){.site-footer{gap:14px 18px}.site-footer .footer-links{width:100%;margin:0;gap:0 22px}.footer-converter{order:3}.info-main{padding-top:32px;padding-bottom:42px}.info-heading{padding-bottom:22px;margin-bottom:24px}.info-heading h1{font-size:37px;letter-spacing:-1px}.info-lede{font-size:17px}.info-copy{font-size:15px;line-height:1.85}.info-copy h2{font-size:22px;margin-top:28px}.contact-card{padding:21px 19px}.contact-card .contact-email{font-size:21px}.info-page .site-header nav{gap:10px}.info-page .site-header nav a:last-child{display:none}.info-page .site-header nav a:first-child{display:flex}.info-page .brand{flex-shrink:0}}
@media print{.info-page{background:#fff;color:#000}.info-page .info-main{display:block;max-width:none;min-height:0;padding:0}.info-page .info-heading,.info-page .info-copy{display:block!important}.info-page .info-heading{padding-bottom:15px;margin-bottom:20px}.info-page .info-heading h1{font-size:30px}.info-page .info-copy{font-size:11pt;line-height:1.6}.info-page .info-copy h2{font-size:16pt;break-after:avoid}.info-page .info-copy p{orphans:3;widows:3}.info-page .contact-card{background:#fff;break-inside:avoid}.info-page a,.info-page p{color:#000}.info-page .info-return{display:none}}

.related-tool{margin:22px 0 0;border:1px solid var(--line);border-radius:10px;padding:19px 22px;background:var(--purple-pale);font-size:14px;line-height:1.7}.related-tool strong{display:block;margin-bottom:5px}.related-tool a{display:inline-block;padding:7px 0;color:var(--ink)}@media print{.related-tool{display:none}}