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@media(min-width:1350px){.header nav{gap:24px}.header nav a{font-size:.86rem}}
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@media(max-width:850px){.header{height:auto;min-height:78px;flex-wrap:wrap;position:relative;padding-block:18px}.menu-toggle{display:block;margin-left:auto;background:transparent;color:var(--ink);border-color:var(--line);padding:6px 12px;min-height:38px}.header nav{display:none;order:4;flex-basis:100%;justify-content:start;flex-wrap:wrap;padding-top:12px}.header nav.open{display:flex}.header nav a{font-size:.88rem;padding:8px}.header-tools{gap:14px}.hero{grid-template-columns:1fr;padding-block:45px;gap:35px}.hero h1{font-size:3.9rem}.hero .lead{max-width:650px}.hero-visual{max-width:650px}.visual-metrics strong{font-size:1.4rem}.hero-proof{font-size:.76rem}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.cards>.card:last-child:nth-child(3){grid-column:1/-1}.topic-grid{grid-template-columns:repeat(2,1fr)}.split{gap:35px}.section{padding-block:50px}.calculator-layout{grid-template-columns:1fr}.result-panel{position:static}.method-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.trust-strip{justify-content:start;padding-inline:28px;gap:18px}.trust-strip>span{flex-basis:100%}.admin-sidebar{width:185px;padding:25px 18px}.admin-main{margin-left:185px;padding:25px}.admin-grid{grid-template-columns:1fr}.stat-grid{grid-template-columns:repeat(2,1fr)}.admin-top{align-items:start}.admin-top form{flex-direction:column;align-items:end}.admin-main .cards{grid-template-columns:1fr}.admin-main .check-grid{grid-template-columns:1fr}.admin-sidebar .brand{font-size:1.4rem}}
@media(max-width:540px){.container{padding-inline:20px}.header{padding-inline:20px;gap:12px}.brand{font-size:1.4rem}.header-tools{font-size:.8rem}.hero h1{font-size:3.3rem}.hero .lead{font-size:1rem}.actions{gap:14px}.hero .actions{align-items:start;flex-direction:column}.visual-top{padding-inline:18px;font-size:.56rem}.visual-metrics{margin:0 18px;gap:6px}.visual-metrics strong{font-size:1.02rem}.visual-metrics span{font-size:.55rem}.visual-note{margin-inline:18px;font-size:.56rem}.hero-proof{font-size:.66rem;gap:12px}.cards{grid-template-columns:1fr}.topic-grid{grid-template-columns:1fr}.section-heading{align-items:start;flex-direction:column}.split{grid-template-columns:1fr;gap:40px}.card{padding:22px}.form-grid{grid-template-columns:1fr}.form-heading{align-items:start;flex-direction:column}.footer-grid{grid-template-columns:1fr 1fr;gap:26px 20px}.footer-grid>div:first-child{grid-column:1/-1}footer{padding-inline:20px}.footer-bottom{flex-direction:column;gap:10px}.article-body{font-size:1rem}.admin-sidebar{position:static;width:auto;padding:18px}.admin-sidebar .brand{margin-bottom:8px}.admin-sidebar .eyebrow{display:none}.admin-sidebar nav{display:flex;overflow:auto;margin:15px 0;gap:5px}.admin-sidebar nav a{white-space:nowrap;font-size:.75rem;padding:8px}.admin-sidebar>a:not(.brand){display:inline-block;margin-right:20px;margin-bottom:0}.admin-main{margin-left:0;padding:20px}.admin-top{gap:12px}.admin-top h1{font-size:1.5rem}.admin-top form span{display:none}.admin-top .eyebrow{font-size:.55rem}.stat-grid{gap:10px}.stat{padding:16px}.stat strong{font-size:2rem}.sticky-save{flex-wrap:wrap}.revision-row{align-items:start;flex-direction:column}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.header,footer,.breadcrumbs,.calculator-form button,.result-panel .actions,#unit-toggle,.sticky-save,.admin-sidebar,.admin-top form,dialog{display:none!important}body{background:white;color:black;font-size:10pt}.container{padding:0;max-width:none}.section{padding:0}.calculator-layout,.method-grid,.cards{display:block}.card,.callout,.result-panel{box-shadow:none;background:white;border:1px solid #bbb;break-inside:avoid;position:static;margin:16px 0;padding:16px}h1{font-size:22pt}h2{font-size:16pt}.result-item strong{font-size:14pt}.form-grid{grid-template-columns:repeat(2,1fr)}details{display:block}details p{display:block}.admin-main{margin:0;padding:0}.sources{font-size:8pt}a{color:black}svg{max-height:100px}.alert{background:white}.input-unit input,.input-unit select{border-color:#999}}
/* Readable header CTA and larger navigation targets (Lighthouse mobile audit). */
.header-tools a.header-cta{color:#fff}
.header-tools>a:not(.header-cta){display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px}
.footer-grid a:not(.brand){min-height:24px}
@media(max-width:850px){.header nav a{min-height:44px;display:inline-flex;align-items:center}.menu-toggle{min-height:44px}.header-tools{gap:10px}}