@font-face{font-family:'Space Grotesk';src:url('../fonts/space-grotesk.ttf') format('truetype');font-weight:300 700;font-display:swap}
@font-face{font-family:Manrope;src:url('../fonts/manrope.ttf') format('truetype');font-weight:200 800;font-display:swap}
@font-face{font-family:'IBM Plex Mono';src:url('../fonts/ibm-plex-mono.ttf') format('truetype');font-weight:400;font-display:swap}
:root{color-scheme:light;--bg:#f3f2ed;--surface:#fffefa;--surface-raised:#e8e9e1;--surface-soft:#eeeee7;--input:#fffefa;--text:#222822;--muted:#5f665e;--subtle:#747b73;--line:#d0d3c9;--line-soft:#dfe1d8;--accent:#ed5428;--accent-hover:#c83f19;--accent-ink:#fff;--focus:#d54117;--success:#316145;--success-bg:#e8f0e8;--warning:#86501c;--warning-bg:#fff2d8;--danger:#a63324;--danger-bg:#fceae5;--radius:2px;--panel-radius:2px;--gutter:48px;--font:Manrope,sans-serif;--display:'Space Grotesk',sans-serif;--mono:'IBM Plex Mono',monospace;font-family:var(--font);font-size:100%;line-height:1.6;font-synthesis:none;text-rendering:optimizeLegibility}
*,*::before,*::after{box-sizing:border-box}html{min-width:280px;scroll-behavior:smooth;scroll-padding-top:24px}body{font-size:.9375rem;margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}button,input,select,textarea,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.65}[hidden]{display:none!important}img,svg{max-width:100%}img{display:block;height:auto}a{color:inherit;text-underline-offset:.24em;text-decoration-thickness:1px}a:hover{color:var(--accent-hover)}button,a,input,textarea,select{transition:background-color .18s,color .18s,border-color .18s,transform .18s}button{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--focus);outline-offset:4px}[tabindex='-1']:focus{outline:0}::selection{background:#ffd7be;color:#222822}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4{font-family:var(--display);font-weight:500;line-height:1.08;letter-spacing:-.045em}h1{font-size:clamp(2.25rem,5vw,4.25rem);margin-bottom:24px}h2{font-size:clamp(1.75rem,3vw,2.75rem);margin-bottom:20px}h3{font-size:1.4375rem;margin-bottom:12px}h4{font-size:1.25rem}p{margin-bottom:18px}strong{font-weight:750}ul,ol{padding-left:1.35rem}li+li{margin-top:6px}small{font-size:0.8125rem}code,pre{font-family:var(--mono)}code{overflow-wrap:anywhere}pre{padding:24px;background:var(--surface-soft);overflow:auto}hr{border:0;border-top:1px solid var(--line);margin:32px 0}.shell{width:min(calc(100% - var(--gutter)*2),1536px);margin-inline:auto}.page-content>.shell{width:100%}.site-main{flex:1;padding:48px 0 80px}.site-header{border-bottom:1px solid var(--line);position:relative;z-index:10;background:var(--bg)}.header-inner{min-height:88px;display:flex;align-items:center;gap:56px}.site-brand{display:flex;align-items:center;gap:16px;text-decoration:none;flex-shrink:0}.brand-monogram{font-family:var(--display);font-weight:700;font-size:2.1875rem;letter-spacing:-2.5px;line-height:1}.brand-monogram>span{color:var(--accent)}.brand-secondary{font:0.5625rem/1.55 var(--mono);letter-spacing:.04em;border-left:1px solid var(--line);padding-left:14px}.site-menu{display:flex;align-items:center;justify-content:space-between;flex:1;gap:28px}.site-nav,.account-nav{display:flex;align-items:center;gap:26px}.site-nav a{font-size:0.8125rem;text-decoration:none;min-height:44px;display:flex;align-items:center;position:relative}.site-nav a[aria-current=page]:after{content:'';height:2px;position:absolute;left:0;right:0;bottom:3px;background:var(--accent)}.account-name{font:0.6875rem var(--mono);max-width:6.875rem;text-overflow:ellipsis;overflow:hidden}.account-name:before{content:'';display:inline-block;width:6px;height:6px;margin-right:8px;background:var(--success);border-radius:50%}.account-nav{gap:18px}.account-nav .button{font-size:0.75rem;padding:9px 14px;min-height:40px}.inline-form{margin:0}.menu-toggle{display:none!important}.skip-link{position:absolute;z-index:60;top:6px;left:16px;transform:translateY(-150%);padding:12px 20px;background:var(--text);color:#fff}.skip-link:focus{transform:translateY(0)}.button{display:inline-flex;align-items:center;justify-content:center;gap:14px;min-height:48px;border:1px solid transparent;padding:12px 22px;border-radius:2px;text-decoration:none;font-family:var(--font);font-size:0.8125rem;font-weight:700;line-height:1.5;touch-action:manipulation}.button-primary{background:var(--text);color:var(--surface);border-color:var(--text)}.button-primary:hover{background:var(--accent);border-color:var(--accent);color:white}.button-primary>span[aria-hidden]{font-size:1.375rem;margin-left:25px}.button-secondary{border-color:var(--line);background:transparent;color:var(--text)}.button-secondary:hover{background:var(--surface);border-color:var(--text)}.button-quiet{background:transparent;color:var(--text)}.button-quiet:hover{background:var(--surface-raised)}.button-large{min-height:62px;padding:16px 26px;font-size:0.9375rem}.text-button{font-size:0.75rem;font-weight:600;min-height:44px;border:0;padding:8px 0;background:transparent}.text-button:hover{color:var(--accent-hover)}.icon-button{width:44px;height:44px;display:grid;place-content:center;font-size:1.625rem;background:transparent;border:1px solid var(--line)}.icon-button:hover{background:var(--surface)}.text-arrow{display:inline-flex;align-items:center;justify-content:space-between;gap:50px;border-bottom:1px solid var(--text);padding:14px 0;text-decoration:none;font-weight:600;font-size:0.875rem}.text-arrow span{font-size:1.5rem}.page-heading{max-width:53.125rem;margin-bottom:38px}.eyebrow,.section-number{font:0.625rem/1.6 var(--mono);letter-spacing:.07em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:20px}.lede{font-size:1.125rem;line-height:1.7;color:var(--muted);max-width:42.5rem}.text-muted{color:var(--muted)}.stack{display:flex;flex-direction:column;gap:24px}.panel{padding:32px;background:var(--surface);border:1px solid var(--line);border-radius:2px;min-width:0;margin-bottom:24px}.panel>:last-child,.notice>:last-child{margin-bottom:0}.split-layout{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start}.diagram-panel{padding:40px;background:var(--surface-soft);border:1px solid var(--line)}.diagram-panel figure{margin:0}.diagram-panel img{width:100%;height:350px;object-fit:contain}.diagram-panel figcaption{color:var(--muted);font-size:0.8125rem;margin-top:24px}.field{margin-bottom:24px;min-width:0}.field-label,.field>label{display:block;font-size:0.8125rem;font-weight:700;margin-bottom:8px}.form-input{display:block;width:100%;min-width:0;min-height:50px;border:1px solid #aeb4a7;background:var(--surface);color:var(--text);padding:12px 14px;border-radius:2px;font-size:1rem}.form-input:focus{border-color:var(--accent)}.form-input::placeholder{color:#777e72}.form-input[aria-invalid=true]{border-color:var(--danger)}textarea.form-input{min-height:155px;resize:vertical}.field-help{font-size:0.75rem;line-height:1.65;color:var(--muted);display:block;margin:10px 0 0}.field-error{font-size:0.75rem;line-height:1.6;color:var(--danger);margin:8px 0}.field-error ul,.errorlist{padding:0;list-style:none}.field-error ul,.errorlist li{margin:0}.input-wrap{position:relative;display:flex;min-width:0}.input-wrap .form-input{flex:1}.input-wrap>.unit{display:flex;align-items:center;padding:0 15px;border:1px solid #aeb4a7;border-left:0;font-family:var(--mono);background:var(--surface-soft)}.unit{font-size:0.75rem;font-weight:400;white-space:nowrap;color:var(--muted)}.password-toggle{background:transparent;border:0;position:absolute;right:10px;top:5px;min-height:40px;min-width:3rem;font-size:0.75rem;text-decoration:underline}.input-wrap:has(.password-toggle) input{padding-right:74px}.password-wrap{position:relative}.password-wrap input{padding-right:74px}.check-row{display:flex;align-items:flex-start;gap:10px;font-size:0.75rem;line-height:1.65;cursor:pointer}.checkbox-input,input[type=checkbox]{accent-color:var(--text);width:18px;height:18px;flex-shrink:0;margin:0;margin-top:2px}.inline-links,.form-actions{display:flex;justify-content:space-between;gap:18px;align-items:center;flex-wrap:wrap}.form-actions{margin-top:28px}.inline-links a{font-size:0.75rem}.notice,.error-summary{padding:18px 22px;border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--surface);margin-bottom:22px;font-size:0.8125rem}.notice-warning{background:var(--warning-bg);border-left-color:var(--warning)}.error-summary,.notice-error{background:var(--danger-bg);border-left-color:var(--danger);color:var(--danger)}.error-summary h2{font-size:1.25rem}.notice h3{font-size:1.1875rem}.message-stack{margin-bottom:24px}.status{display:inline-block;font:0.6875rem var(--mono);padding:7px 12px;border:1px solid currentColor}.status-pass{color:var(--success)}.status-fail{color:var(--danger)}.metrics{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:28px 0;border-block:1px solid var(--line);margin:28px 0}.metric dt{font-size:0.75rem;color:var(--muted)}.metric dd{font:3rem var(--display);letter-spacing:-.06em;margin:8px 0 0}.metric dd .unit{margin-left:5px}.definition-list{margin:24px 0 0}.definition-list>div{border-top:1px solid var(--line);padding:16px 0;display:flex;justify-content:space-between;gap:24px}.definition-list dt{font-size:0.75rem;color:var(--muted)}.definition-list dd{margin:0;font-family:var(--mono);font-size:0.875rem}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.engineering-checks{grid-template-columns:repeat(2,1fr)}.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.review-row{margin:18px 0}.review-input{display:flex;min-width:0;align-items:center;gap:10px}.review-symbol{font-family:var(--mono);font-size:0.75rem;color:var(--accent-hover)}details{margin-bottom:20px}summary{cursor:pointer;font-family:var(--display);font-weight:500;font-size:1.25rem;line-height:1.5}details[open]>summary{margin-bottom:22px}.stepper{display:flex;gap:16px;padding:0;list-style:none;margin-bottom:30px;flex-wrap:wrap}.stepper a{color:inherit}.stepper li{font-size:0.8125rem}.stepper [aria-current=step]{color:var(--accent-hover)}.steps-label{font-family:var(--mono);font-size:0.625rem}.site-footer{border-top:1px solid var(--line);padding:30px 0 20px}.footer-inner{display:flex;justify-content:space-between;gap:30px}.footer-credit{display:flex;flex-direction:column;font-size:0.75rem;gap:3px}.footer-credit span{font:0.625rem var(--mono);color:var(--muted)}.footer-links{display:flex;gap:22px;align-items:flex-start;flex-wrap:wrap}.footer-links a{font-size:0.6875rem;text-decoration:none}.preview-note{display:flex;align-items:center;gap:20px;margin-top:10px;font-size:0.625rem;color:var(--muted)}.preview-label{font-family:var(--mono)}.preview-dot,.live-dot{width:6px;height:6px;display:inline-block;background:var(--accent);border-radius:50%;margin-right:7px}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.warning-list{font-size:0.8125rem}.content-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}.pending-badge{font:0.625rem var(--mono);color:var(--warning)}.prose{max-width:56.25rem}.prose p{line-height:1.8}
@media(max-width:68.75em){:root{--gutter:30px}.header-inner{gap:32px}.site-nav{gap:20px}.review-grid{grid-template-columns:1fr}}
@media(max-width:60em){.menu-toggle{display:inline-flex!important;margin-left:auto}.header-inner{min-height:76px;flex-wrap:wrap;gap:0}.site-menu{display:none;flex-basis:100%;border-top:1px solid var(--line);padding:16px 0 24px}.site-menu[data-open=true]{display:flex;align-items:stretch;flex-direction:column;gap:18px}.site-nav{align-items:stretch;gap:0;flex-direction:column}.site-nav a{padding:10px 0}.site-nav a[aria-current=page]:after{right:auto;width:32px}.account-nav{justify-content:flex-start}.brand-monogram{font-size:2rem}.site-main{padding-top:32px}.result-grid{grid-template-columns:1fr 1fr}}
@media(max-width:40.625em){:root{--gutter:20px}.site-main{padding:28px 0 48px}.brand-secondary{font-size:0.5rem}.brand-monogram{font-size:1.875rem}.header-inner{min-height:70px}.button{min-height:48px}.split-layout,.review-grid,.metrics,.result-grid,.content-grid{grid-template-columns:1fr}.split-layout{gap:24px}.diagram-panel{order:0;padding:20px}.diagram-panel img{height:220px}.panel{padding:22px}.footer-inner{flex-direction:column;gap:16px}.footer-links{gap:16px}.preview-note{flex-wrap:wrap;gap:10px 16px}.definition-list>div{gap:12px}.form-actions{align-items:stretch}.form-actions .button{flex:1}.page-heading{margin-bottom:28px}.inline-links{align-items:flex-start}.metric dd{font-size:2.5rem}h1{letter-spacing:-.045em}.result-grid h3{font-size:1.5rem}.scope-details summary{font-size:0.875rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}
@media print{body{background:#fff;color:#000;font-size:0.6875rem}.site-header,.site-footer,.skip-link,.form-actions,.button,[data-print-results]{display:none!important}.site-main{padding:0}.shell{width:100%;max-width:none}h1{font-size:1.875rem}h2{font-size:1.375rem}.panel{break-inside:avoid;border-color:#aaa;background:white}.result-grid{grid-template-columns:1fr 1fr}details{break-inside:avoid}a{color:inherit}.status{color:#000}.unit,.field-help{color:#333}}
.button-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:#fff}
@media(max-width:22.5em){.menu-toggle>span{display:none}.menu-toggle{padding:8px 10px;width:42px}.header-inner{flex-wrap:wrap}.studio-heading h1{font-size:1.6875rem}}
.auth-meta,.editorial-preview-note,.editorial-preview-note a{color:#5f665e}

/* Local messages can contain full reset URLs, email addresses and pasted text. */
.preview-mailbox,.mail-message,.mail-body{min-width:0}
.mail-message{overflow-wrap:anywhere;word-break:normal}
.mail-message a,.mail-message .field-help,.mail-body p{overflow-wrap:anywhere}
.mail-message pre{max-width:100%;white-space:pre-wrap;overflow-wrap:anywhere}
.mail-message .form-actions .button{max-width:100%;white-space:normal;text-align:center}

/* Field-first reference pages. Legends remain real text at the reader's chosen size. */
.diagram-panel picture{display:block}
.diagram-legend{margin:24px 0 0;border-top:1px solid var(--line)}
.diagram-legend>div{display:grid;grid-template-columns:2.5rem minmax(0,1fr);gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}
.diagram-legend dt{font:600 .9375rem var(--mono);color:var(--accent-hover)}
.diagram-legend dd{margin:0;font-size:.875rem;line-height:1.65}
.number-format-note{margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid var(--line)}
@media(max-width:60em){.diagram-panel img{height:auto;width:100%;aspect-ratio:320/210}.diagram-panel{padding:22px}}
@media(max-width:40.625em){
  .step-layout .form-panel{order:0}
  .step-layout .diagram-panel{order:1}
  .step-layout .diagram-panel h2{font-size:1.75rem}
  .step-layout .diagram-panel figcaption{font-size:.875rem;margin-top:18px}
  .diagram-legend{margin-top:20px}
}

/* Shared, cancellable confirmations used on account and calculator pages. */
.app-dialog{position:fixed;width:min(calc(100% - 32px),31rem);max-width:calc(100% - 32px);max-height:calc(100dvh - 32px);overflow-y:auto;margin:auto;padding:2.25rem;border:1px solid var(--line);background:var(--surface);color:var(--text);box-shadow:0 15px 80px #0002}
.app-dialog::backdrop{background:#22282277;backdrop-filter:blur(4px)}
.app-dialog h2{font-size:2.25rem;padding-right:1.5rem;margin-bottom:18px;overflow-wrap:anywhere}
.app-dialog p{font-size:.9375rem;line-height:1.7;color:var(--muted)}
.dialog-close{position:absolute;top:8px;right:8px;display:grid;place-items:center;min-width:44px;min-height:44px;padding:8px;border:0;background:transparent;font:1.75rem/1 var(--display);color:var(--muted)}
.dialog-close:hover{background:var(--surface-soft);color:var(--text)}
.dialog-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end;margin-top:30px}
.dialog-actions .button{min-width:0;white-space:normal;overflow-wrap:anywhere;text-align:center}
@media(max-width:31.25em){.app-dialog{padding:1.625rem}.app-dialog h2{font-size:1.875rem}.dialog-actions{flex-direction:column-reverse}.dialog-actions .button{width:100%}}
@media print{.app-dialog{display:none!important}}