:root{color-scheme:light;--ink:#192b3a;--muted:#4b5966;--body-size:17px;--blue:#225de8;--line:#e0e6e9;--paper:#fafbf9;--serif:Georgia,'Times New Roman',serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:var(--body-size);line-height:1.8}button,input,select,textarea{font:inherit}a{color:inherit;text-underline-offset:4px}button,a,select,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}button:focus-visible,a:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--blue);outline-offset:5px}select:focus,textarea:focus{outline:2px solid var(--blue);outline-offset:2px}.wrap{max-width:1120px;margin:auto;padding-left:32px;padding-right:32px}.site-header{height:80px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;text-decoration:none;font-size:21px;font-weight:750;letter-spacing:-.7px}.brand-icon{display:grid;place-items:center;color:white;background:var(--blue);border-radius:8px;width:34px;height:34px;margin-right:10px;font-family:var(--serif);font-size:21px}.brand-light{font-weight:400}.domain-dot{color:var(--blue)}nav{display:flex;gap:30px;font-size:13px}nav a{text-decoration:none}nav a:hover{color:var(--blue)}.intro{padding:34px 0 18px}.eyebrow{display:flex;align-items:center;gap:9px;font-size:10px;font-weight:700;letter-spacing:1.6px;color:var(--muted);margin:0 0 16px}.eyebrow>span{width:6px;height:6px;background:var(--blue);border-radius:50%}h1{font-family:var(--serif);font-size:54px;font-weight:400;letter-spacing:-2.5px;line-height:1.12;margin:0 0 17px}p{margin:0 0 20px}.intro-copy{max-width:70ch;font-size:var(--body-size);color:var(--muted);line-height:1.8}.calculator{display:grid;grid-template-columns:1fr 1fr;background:white;border:1px solid #d9e0e5;border-radius:14px;overflow:hidden;box-shadow:0 6px 20px #243b5210}.input-panel,.result-panel{padding:28px 30px}.result-panel{background:#f0f4fa;border-left:1px solid #dce3ec;min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.panel-heading h2{font-size:17px;margin:0;font-weight:600}.step-label{font-size:9px;letter-spacing:1.5px;color:var(--muted)}label{display:block;font-size:15px;font-weight:600;margin-bottom:8px}select,textarea{width:100%;border:1px solid #d8dfe5;border-radius:6px;background:white;color:var(--ink)}select{height:44px;padding:0 12px;font-size:16px;margin-bottom:21px}textarea{padding:13px 14px;resize:vertical;min-height:106px;font-size:17px;line-height:1.6;display:block}textarea::placeholder{color:#98a2ab}.field-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.text-button{background:none;border:0;color:var(--blue);padding:0;margin-bottom:8px;font-size:15px}.hint{font-size:13px;line-height:1.6;color:var(--muted);margin:9px 0 0}.form-actions{display:flex;gap:10px;margin-top:22px}.primary-button{background:var(--blue);color:white;border:0;border-radius:6px;padding:12px 18px;flex:1;font-size:15px;font-weight:600;display:flex;justify-content:space-between;align-items:center}.primary-button:hover{background:#164dd0}.clear-button{background:white;border:1px solid #d8dfe5;border-radius:6px;padding:10px 20px;font-size:15px;color:var(--muted)}.privacy-note{font-size:13px;color:var(--muted);margin:17px 0 0}.privacy-note span{color:var(--blue);margin-right:5px}.empty-result{text-align:center;padding:25px 16px 15px}.result-symbol{display:block;font-family:var(--serif);font-size:44px;letter-spacing:-2px;color:#718bb5;margin:0 0 18px}.empty-result h3{font-family:var(--serif);font-weight:400;font-size:24px;margin:0 0 10px}.empty-result p{font-size:var(--body-size);color:var(--muted);max-width:280px;margin:0 auto 26px;line-height:1.8}.empty-tag{font-size:9px;letter-spacing:1.4px;text-transform:uppercase;color:#7688a0;border-top:1px solid #d6dfec;padding-top:15px}.result-label{font-size:15px;color:var(--muted);margin:0}.result-value{font-family:var(--serif);font-size:48px;color:var(--blue);line-height:1.3;overflow-wrap:anywhere}.result-stats{display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:16px 0;border-bottom:1px solid #d6dfec}.result-stats span{display:block;font-size:13px;color:var(--muted)}.result-stats strong{font-size:19px;overflow-wrap:anywhere}.breakdown-heading{font-size:18px;margin:17px 0 8px}.result-table{max-height:190px}.result-table th,.result-table td{font-size:16px;padding:7px 10px}.result-table thead{position:sticky;top:0;background:#e8eef7}.under-calculator{display:flex;justify-content:center;gap:30px;font-size:13px;color:var(--muted);padding:18px 0 0}.under-calculator i{font-style:normal;color:var(--blue);margin-right:5px}.content-section{padding:55px 0;border-bottom:1px solid var(--line)}.section-top{display:flex;justify-content:space-between;align-items:start}.section-number{font-size:11px;color:#97a2ac;font-family:monospace}h2{font-family:var(--serif);font-size:33px;font-weight:400;line-height:1.25;letter-spacing:-.7px;margin:0 0 16px}.panel-heading h2{font-family:Arial,Helvetica,sans-serif;letter-spacing:0}.section-lead{max-width:70ch;font-size:var(--body-size);color:var(--muted);line-height:1.8;margin-bottom:26px}.explanation-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:46px;align-items:center}h3{font-size:18px;margin:0 0 12px}.explanation-grid p{font-size:var(--body-size);color:var(--muted);line-height:1.8}.formula{background:#edf2fc;border-left:3px solid var(--blue);padding:18px;font-family:var(--serif);font-size:23px;color:var(--blue);margin:18px 0}.formula span{white-space:nowrap}figure{margin:0}img{max-width:100%;height:auto;display:block}figcaption{font-size:13px;text-align:center;color:var(--muted);margin-top:8px}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.steps article{padding:20px 22px;background:white;border:1px solid var(--line);border-radius:9px}.step-circle{display:grid;place-items:center;width:26px;height:26px;background:#edf2ff;color:var(--blue);font-size:11px;border-radius:50%;margin-bottom:18px}.steps p{font-size:16px;color:var(--muted);line-height:1.8}.steps .step-math{font-size:16px;color:var(--ink);margin:0;line-height:1.8}.example-takeaway{font-size:var(--body-size);background:#eef3fa;padding:16px 20px;border-radius:6px;margin:20px 0 0;line-height:1.8}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left}th,td{padding:18px 20px;border-bottom:1px solid var(--line);font-size:16px;vertical-align:top}thead{background:#edf1f3}thead th{font-size:14px;font-weight:600;letter-spacing:.5px}.comparison-table{min-width:600px}.comparison-table th[scope=row]{width:27%;font-weight:600}.comparison-table td{color:var(--muted)}.comparison-table th span{display:block;font-size:13px;font-weight:400;color:var(--muted);margin-top:4px}.source-note{margin-top:16px}.faq-section{display:grid;grid-template-columns:1fr 1.6fr;gap:50px;border-bottom:0}.faq-section>div>p:not(.eyebrow){font-size:var(--body-size);color:var(--muted);line-height:1.8}details{border-bottom:1px solid var(--line);padding:15px 0}details:first-child{padding-top:0}summary{cursor:pointer;font-size:18px;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:16px}summary::-webkit-details-marker{display:none}summary::after{content:'+';color:var(--muted);font-size:18px;font-weight:400;line-height:1.2}details[open] summary::after{content:'−'}details p{font-size:var(--body-size);color:var(--muted);margin:12px 22px 0 0;line-height:1.8}code{overflow-wrap:anywhere;font-size:15px;color:var(--ink)}.site-footer{border-top:1px solid var(--line);display:flex;align-items:center;gap:25px;padding-top:25px;padding-bottom:30px}.site-footer .brand{font-size:17px}.site-footer p{font-size:13px;color:var(--muted);margin:0}.site-footer>a:last-child{margin-left:auto;font-size:10px;text-decoration:none}.error{font-size:13px;color:#a22627;margin:10px 0}.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-link{position:absolute;left:20px;top:-100px;background:white;padding:10px;z-index:2}.skip-link:focus{top:10px}[hidden]{display:none!important}@media(max-width:720px){.wrap{padding-left:20px;padding-right:20px}.site-header{height:76px}nav{gap:15px;font-size:11px}.site-header nav a:first-child{display:none}.brand{font-size:18px}.brand-icon{width:29px;height:29px;font-size:17px;margin-right:7px}.intro{padding-top:35px}h1{font-size:46px}.eyebrow{font-size:8px;letter-spacing:1.2px}.intro-copy{font-size:var(--body-size);line-height:1.8}.calculator{grid-template-columns:1fr}.input-panel,.result-panel{padding:23px}.result-panel{border-left:0;border-top:1px solid #dce3ec}.empty-result{padding:10px 0 22px}.empty-result p{margin-bottom:20px;font-size:var(--body-size);line-height:1.8}.under-calculator{gap:13px;font-size:13px}.content-section{padding:38px 0}h2{font-size:28px}.explanation-grid,.steps,.faq-section{grid-template-columns:1fr;gap:20px}.explanation-grid figure{max-width:440px;margin:auto}.steps article{padding:20px}.faq-section{gap:22px}.desktop-break{display:none}.site-footer{flex-wrap:wrap;gap:10px}.site-footer p{order:3;width:100%;font-size:13px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Teaching content: readable paragraphs and a compact formula reference. */
.content-section>p:not(.eyebrow):not(.example-takeaway):not(.hint){max-width:70ch;color:var(--muted);font-size:var(--body-size);line-height:1.8}
.reading-list{max-width:70ch;padding-left:23px;color:var(--muted);font-size:var(--body-size);line-height:1.8;margin:0 0 20px}
.reading-list li{padding-left:5px;margin-bottom:10px}
.reading-list strong{color:var(--ink)}
.follow-up-heading{margin-top:26px}
.symbol-table th[scope=row]{font-family:var(--serif);font-size:18px;width:15%;white-space:nowrap;color:var(--blue)}
.symbol-table td{color:var(--muted);width:42.5%}
.symbol-table th,.symbol-table td{padding:12px 16px;font-size:16px}
.symbol-table tbody tr:nth-child(even){background:#f1f4f7}
.content-section .explanation-grid{margin-bottom:26px}
@media(max-width:720px){.symbol-table th,.symbol-table td{padding:10px 8px;font-size:16px}.symbol-table th[scope=row]{font-size:16px}.symbol-table td{overflow-wrap:anywhere}.faq-section h2{max-width:100%}}

.footer-nav{margin-left:auto;gap:20px;font-size:13px;flex-wrap:wrap}
.policy-page{max-width:880px;padding-bottom:35px}
.policy-section{padding:26px 0;border-bottom:1px solid var(--line)}
.policy-section:last-child{border:0}
.policy-section h2{font-size:27px}
.policy-section h3{margin-top:22px}
.policy-section p{font-size:var(--body-size);line-height:1.8;color:var(--muted)}
@media(max-width:720px){.footer-nav{margin-left:0;width:100%;gap:20px;font-size:13px}.site-header nav a:only-child{display:inline}.policy-page h1{font-size:40px}.policy-section h2{font-size:25px}}


/* Reflow enlarged text without shrinking reading content on small screens. */
.content-section p,.policy-section p{max-width:70ch}
.result-table thead th{font-size:14px}
.symbol-table{min-width:580px}
.symbol-table thead th{font-size:14px}
.symbol-table th[scope=row]{font-size:18px}
.calculator,.explanation-grid,.steps,.faq-section{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.steps{grid-template-columns:repeat(3,minmax(0,1fr))}
.faq-section{grid-template-columns:minmax(0,1fr) minmax(0,1.6fr)}
.input-panel,.steps article,.faq-list,.explanation-grid>div{min-width:0}
.form-actions,.field-heading,.site-footer,.under-calculator{flex-wrap:wrap}
.primary-button{min-width:165px;gap:12px}
.field-heading{row-gap:4px}
summary{line-height:1.5}
summary::after{flex-shrink:0}
details{padding:20px 0}
details p{margin-top:16px;margin-right:0}
.site-header{gap:12px;height:auto;min-height:80px;padding-top:16px;padding-bottom:16px;flex-wrap:wrap}
@media(max-width:720px){
  :root{--body-size:16px}
  .calculator,.explanation-grid,.steps,.faq-section{grid-template-columns:minmax(0,1fr)}
  .under-calculator{gap:8px 16px}
  .form-actions{row-gap:12px}
  .symbol-table td{overflow-wrap:normal}
}