@font-face{font-family:Barlow;src:url('/assets/fonts/barlow-semi-condensed-600.woff2') format('woff2');font-style:normal;font-weight:600;font-display:optional}
@font-face{font-family:Barlow;src:url('/assets/fonts/barlow-semi-condensed-700.woff2') format('woff2');font-style:normal;font-weight:700;font-display:optional}
@font-face{font-family:Source;src:url('/assets/fonts/source-sans-3.woff2') format('woff2');font-style:normal;font-weight:400 700;font-display:optional}
:root{--ink:#102f43;--ocean:#075c75;--pool:#ddeff4;--canvas:#f5f9fa;--amber:#e2a846;--line:#c9dde3;--muted:#4d6573;--white:#fff;--error:#a32832;--radius:12px;color:var(--ink);background:var(--canvas);font-family:Source,'Segoe UI',sans-serif;font-size:17px;font-weight:400;line-height:1.5;font-synthesis:none}
*{box-sizing:border-box}body{margin:0}a{color:var(--ocean);text-underline-offset:3px}a:hover{text-decoration-thickness:2px}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--ocean);outline-offset:4px}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}img,svg{max-width:100%}[hidden]{display:none!important}
.container{width:min(1120px,calc(100% - 64px));margin-inline:auto}.skip-link{position:absolute;left:16px;top:-100px;z-index:10;background:var(--white);padding:12px}.skip-link:focus{top:12px}.site-header{background:var(--white);border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;min-height:84px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:700 25px/1 Barlow,'Arial Narrow',sans-serif;white-space:nowrap}.brand-icon{width:34px;height:34px;flex-shrink:0}.brand span span{color:var(--ocean)}.main-nav{display:flex;gap:28px;align-items:stretch}.main-nav a{display:flex;align-items:center;min-height:84px;font-size:16px;text-decoration:none;color:var(--muted);border-bottom:3px solid transparent;padding-top:3px;white-space:nowrap}.main-nav a[aria-current=page]{color:var(--ocean);border-color:var(--ocean);font-weight:600}.main-nav a:hover{color:var(--ink)}
.page-intro{padding:48px 0 30px;max-width:800px}.eyebrow{font-size:12px;line-height:1.4;font-weight:600;text-transform:uppercase;letter-spacing:.13em;color:var(--ocean);margin:0 0 9px}.page-intro h1{font:600 clamp(38px,4.2vw,54px)/1.06 Barlow,'Arial Narrow',sans-serif;letter-spacing:-.015em;margin:0 0 14px}.page-intro .lead{font-size:19px;color:var(--muted);max-width:740px;margin:0}.workspace{display:grid;grid-template-columns:minmax(0, .83fr) minmax(0,1.17fr);gap:28px;align-items:start}.input-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--white);padding:27px 28px 24px;box-shadow:0 5px 16px #102f4305}.panel-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:22px}.panel-heading h2,.results-heading h2{font:600 24px/1.2 Barlow,'Arial Narrow',sans-serif;margin:0}.panel-heading>span{font-size:13px;color:var(--muted)}label,.field-label,legend{font-weight:600;display:block;margin-bottom:7px}.field{margin:0 0 20px}.field-row{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.85fr);gap:15px}select,input[type=text]{width:100%;min-width:0;min-height:50px;color:var(--ink);background:var(--white);border:1px solid #668592;border-radius:6px;padding:10px 12px}select{padding-right:28px}select:focus,input:focus{border-color:var(--ocean)}.time-input{font-size:27px!important;font-family:Barlow,'Arial Narrow',sans-serif!important;font-weight:600;letter-spacing:.025em;font-variant-numeric:tabular-nums;min-height:59px!important}input::placeholder{color:#526d7a;opacity:1}.field-hint{font-size:14px;color:var(--muted);margin:7px 0 0}.field-error{color:var(--error);font-size:14px;margin:6px 0 0}.field-error:empty{display:none}input[aria-invalid=true]{border:2px solid var(--error)}.notice{font-size:14px;line-height:1.4;color:var(--ocean);margin:-8px 0 17px}.notice:empty{display:none}.actions{display:flex;gap:12px;align-items:center;margin-top:25px}button{min-height:48px;border:1px solid var(--ocean);border-radius:6px;padding:10px 22px;background:var(--ocean);color:var(--white);font-weight:600}button:hover{background:#084b60}.actions button[type=submit]{flex:1}.secondary{color:var(--ocean);background:var(--white);border-color:var(--line)}.secondary:hover{background:var(--pool)}.form-footnote{margin:16px 0 0;font-size:13px;color:var(--muted);text-align:center}.privacy-lock{display:inline-block;vertical-align:-2px;width:12px;height:14px;margin-right:5px}.results-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:0 0 14px}.results-heading p{font-size:14px;margin:0;color:var(--muted)}.results-stack{display:grid;gap:16px}.result-card{position:relative;background:var(--pool);border:1px solid #b9d8e1;border-left:5px solid var(--ocean);border-radius:0 var(--radius) var(--radius) 0;padding:21px 24px;min-height:215px;overflow-wrap:anywhere}.result-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.result-heading h3{font-size:18px;line-height:1.3;font-weight:600;margin:0}.event-label{font-size:14px;color:var(--muted);margin:3px 0 0}.course-badge{font:700 24px/1 Barlow,'Arial Narrow',sans-serif;color:var(--ocean);letter-spacing:.04em;border-bottom:3px solid var(--ocean);padding-bottom:6px}.result-caption{margin:17px 0 0;font-size:11px}.result-time{font:600 clamp(42px,5vw,61px)/1.1 Barlow,'Arial Narrow',sans-serif;font-variant-numeric:tabular-nums;letter-spacing:.012em;margin:0 0 13px}.empty-time{color:#648591;margin-top:21px;letter-spacing:.05em}.formula{margin:12px 0 6px;padding-top:11px;border-top:1px solid #adcdd8;font-size:15px;font-variant-numeric:tabular-nums;line-height:1.55}.formula-label{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.09em;font-weight:600;margin-bottom:3px;color:var(--muted)}.source-line{font-size:13px;margin:6px 0 0}.calculation-details{margin-top:12px;font-size:13px}.calculation-details summary{cursor:pointer;min-height:32px;padding:5px 0;color:var(--ocean)}.detail-body{margin-top:8px;border-top:1px solid #adcdd8;padding-top:6px}.detail-formula{font-variant-numeric:tabular-nums}.metadata{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 16px;margin:10px 0}.metadata dt{color:var(--muted)}.metadata dd{margin:0;overflow-wrap:anywhere}.unavailable{background:#f3f4f0;border-color:#d7ddd6;border-left-color:var(--amber)}.unavailable .course-badge{color:var(--muted);border-color:#b9c8cd}.state-label{font-weight:600;font-size:18px;margin:19px 0 7px}.state-description{font-size:15px;color:var(--muted);margin:6px 0 12px;max-width:420px}.unavailable a{font-size:14px}.results-note{font-size:13px;color:var(--muted);line-height:1.5;margin:14px 0 0}.data-error{color:var(--error);background:var(--white);border:1px solid var(--line);padding:20px;border-radius:6px}.data-error:empty{display:none}.model-strip{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:28px 0 0;padding:14px 0;border-block:1px solid var(--line);font-size:13px;color:var(--muted)}.model-strip a{font-weight:600}.model-strip p{margin:0}.content-section{padding:42px 0;border-bottom:1px solid var(--line)}.content-section h2{font:600 30px/1.2 Barlow,'Arial Narrow',sans-serif;margin:0 0 23px}.steps{list-style:none;counter-reset:steps;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:38px;margin:0;padding:0}.steps li{counter-increment:steps;position:relative;padding-left:36px}.steps li:before{content:counter(steps);position:absolute;left:0;top:0;font:600 24px/1.2 Barlow,sans-serif;color:var(--ocean)}.steps h3{font-size:17px;margin:0 0 6px}.steps p{font-size:15px;margin:0;color:var(--muted)}.faq{max-width:850px}.faq details{border-bottom:1px solid var(--line)}.faq details:last-child{border:0}.faq summary{font-weight:600;min-height:56px;padding:16px 24px 16px 0;cursor:pointer}.faq details p{margin:0 0 20px;color:var(--muted);font-size:16px}.tool-link{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 0}.tool-link h2{font:600 25px Barlow,sans-serif;margin:0 0 4px}.tool-link p{margin:0;font-size:15px;color:var(--muted)}.tool-link>a{font-weight:600;white-space:nowrap}.site-footer{border-top:1px solid var(--line);margin-top:26px;background:var(--white)}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:28px 0;font-size:13px;color:var(--muted)}.footer-links{display:flex;gap:22px}.footer-inner p{margin:0}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}noscript p{padding:16px;border:1px solid var(--amber);background:#fff9ed}
fieldset{border:0;padding:0;margin:0 0 20px;min-width:0}.unit-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.unit-option{position:relative;display:flex;align-items:center;justify-content:center;min-height:48px;border:1px solid #91aeb9;border-radius:6px;font-weight:400;margin:0;cursor:pointer;gap:8px}.unit-option:has(input:checked){background:var(--pool);border-color:var(--ocean);font-weight:600}.unit-option input{accent-color:var(--ocean);width:16px;height:16px;margin:0}.input-with-unit{position:relative}.input-with-unit input{padding-right:46px}.input-with-unit>span{position:absolute;right:15px;top:13px;color:var(--muted)}.pace-card{min-height:310px;padding:27px 30px}.pace-card .result-time{font-size:clamp(48px,6vw,76px);margin:4px 0 0}.pace-card .empty-time{margin-top:15px}.pace-unit{font-size:19px;color:var(--ocean);margin:3px 0 22px}.pace-card .source-line{margin-top:13px}.pace-explainer{padding:22px 3px 0}.pace-explainer h3{font-size:17px;margin:0 0 6px}.pace-explainer p{font-size:15px;color:var(--muted);margin:0}.pace-explainer .example{padding-top:15px;margin-top:15px;border-top:1px solid var(--line)}
.method-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:64px;align-items:start}.method-toc{position:sticky;top:24px;border-left:2px solid var(--line);padding-left:18px;margin-top:7px}.method-toc p{font-size:12px;text-transform:uppercase;letter-spacing:.1em;font-weight:600;margin:0 0 10px;color:var(--muted)}.method-toc a{display:block;font-size:15px;padding:6px 0;min-height:34px;text-decoration:none}.method-toc a:hover{text-decoration:underline}.method-content{min-width:0;max-width:780px}.method-content section{padding:0 0 28px;margin:0 0 30px;border-bottom:1px solid var(--line);scroll-margin-top:28px}.method-content h2{font:600 29px/1.2 Barlow,sans-serif;margin:0 0 16px}.method-content h3{font-size:19px;margin:22px 0 10px}.method-content p{color:var(--muted);margin:12px 0}.method-content li{margin:7px 0;color:var(--muted)}.method-content strong{color:var(--ink);font-weight:600}.method-content code{font-size:13px;overflow-wrap:anywhere}.method-content .callout{padding:16px 20px;background:var(--pool);border-left:3px solid var(--ocean);border-radius:0 8px 8px 0;color:var(--ink)}table{border-collapse:collapse;width:100%;font-size:15px;margin:18px 0}th{text-align:left;font-weight:600;background:var(--pool)}td,th{padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}td{color:var(--muted)}.event-matrix{font-size:13px;table-layout:fixed}.event-matrix th:first-child{width:22%}.event-matrix td,.event-matrix th{padding:10px 8px;overflow-wrap:anywhere}.formula-table td{font-variant-numeric:tabular-nums}.source-meta{font-size:14px;color:var(--muted)}.analytics-choice{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);z-index:5;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:20px;box-shadow:0 6px 30px #102f4329;width:min(620px,calc(100% - 32px));display:flex;flex-wrap:wrap;gap:10px;align-items:center}.analytics-choice p{flex-basis:100%;margin:0 0 6px;font-size:15px}.analytics-choice a{font-size:14px;padding:10px}.not-found{min-height:50vh;padding:80px 0}.not-found h1{font:600 52px Barlow,sans-serif;margin:0 0 16px}
@media(min-width:1300px){.page-intro{padding-top:52px}.workspace{gap:36px}.input-panel{padding:28px 30px}.result-card{padding:21px 27px}}
@media(max-width:800px){.container{width:calc(100% - 40px)}.header-inner{min-height:76px;gap:15px}.brand{font-size:23px}.main-nav{gap:16px}.main-nav a{font-size:14px;min-height:76px}.brand-icon{width:29px}.workspace{grid-template-columns:1fr 1.15fr;gap:18px}.input-panel{padding:22px 20px}.field-row{grid-template-columns:1fr;gap:0}.result-card{padding:20px}.results-heading{display:block}.results-heading p{margin-top:5px}.method-layout{grid-template-columns:180px minmax(0,1fr);gap:28px}.steps{gap:20px}.model-strip{align-items:flex-start}}
@media(max-width:620px){.container{width:calc(100% - 32px)}.header-inner{display:block;padding-top:18px}.brand{justify-content:center;font-size:25px}.main-nav{justify-content:space-between;gap:12px;margin-top:9px}.main-nav a{font-size:14px;min-height:48px;padding-top:0}.page-intro{padding:30px 0 24px}.page-intro h1{font-size:40px}.page-intro .lead{font-size:17px}.eyebrow{font-size:11px}.workspace{grid-template-columns:1fr;gap:26px}.input-panel{padding:22px}.field-row{grid-template-columns:minmax(0,1.2fr) minmax(0,.85fr);gap:12px}.field{margin-bottom:18px}.panel-heading{margin-bottom:20px}.field-hint{font-size:13px}.actions{margin-top:20px}.result-card{padding:20px;min-height:215px}.result-time{font-size:53px}.results-heading{padding-bottom:12px}.results-heading h2{font-size:24px}.results-heading p{font-size:13px}.model-strip{display:block;margin-top:25px}.model-strip p+p{margin-top:7px}.content-section{padding:30px 0}.content-section h2{font-size:28px;margin-bottom:18px}.steps{grid-template-columns:1fr;gap:22px}.steps li{padding-left:33px}.tool-link{display:block;padding:25px 0}.tool-link>a{display:inline-block;margin-top:14px;min-height:44px}.footer-inner{display:block;text-align:center;padding:23px 0}.footer-links{justify-content:center;margin-top:12px;gap:25px}.footer-links a{min-height:36px;display:inline-flex;align-items:center}.method-layout{grid-template-columns:1fr;gap:28px}.method-toc{position:static;display:grid;grid-template-columns:1fr 1fr;gap:0 14px;padding:15px 18px;border-left:3px solid var(--ocean);background:var(--pool);margin:0}.method-toc p{grid-column:1/-1}.method-toc a{min-height:38px}.method-content h2{font-size:28px}.method-content p,.method-content li{font-size:16px}.formula-table{font-size:14px}.formula-table td,.formula-table th{padding:9px 7px}.event-matrix{font-size:12px}.event-matrix th:first-child{width:23%}.event-matrix td,.event-matrix th{padding:9px 5px}.pace-card{padding:24px}.pace-card .result-time{font-size:64px}.analytics-choice button{font-size:14px;padding-inline:16px}}
@media(max-width:350px){.container{width:calc(100% - 24px)}.main-nav{gap:8px}.main-nav a{font-size:13px}.page-intro h1{font-size:36px}.input-panel{padding:19px 16px}.field-row{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:10px}.result-card{padding:18px 16px}.result-heading h3{font-size:17px}.course-badge{font-size:22px}.actions button{padding-inline:17px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
/* Field pairs reflow when enlarged text needs more room. */
.calculation-details summary{min-height:44px;padding-block:10px}
/* Reflow also supports enlarged text, without hiding labels or clipping cells. */
.workspace>*,.method-layout>*{min-width:0}
.page-intro h1,.method-content,.method-toc a{overflow-wrap:anywhere}
.brand>span{min-width:0;white-space:normal;overflow-wrap:anywhere}
.main-nav,.actions,.footer-links{flex-wrap:wrap}
.main-nav a{white-space:normal}
.tool-link>a{white-space:normal}
.actions button[type=submit]{flex:1 1 150px}
.method-content table{table-layout:fixed}
.method-content td,.method-content th{overflow-wrap:anywhere}
@media(max-width:620px){.workspace,.method-layout{grid-template-columns:minmax(0,1fr)}.method-toc{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* Calculator layout: keep input, action and result navigation close together. */
.calculator-page .page-intro{padding:32px 0 24px}
.calculator-page .page-intro h1{font-size:clamp(2rem,4.2vw,3rem)}
.calculator-page .input-panel{padding:22px 24px}
.calculator-page .field{margin-bottom:15px}
.calculator-page .panel-heading{margin-bottom:17px}
.calculator-page .actions{margin-top:16px}
.calculator-page .field-row{grid-template-columns:repeat(auto-fit,minmax(min(100%,8rem),1fr));gap:12px}
.calculator-page .field-row>*{min-width:0}
.results-heading{flex-wrap:wrap}
.results-heading h2{flex:1 1 auto}
.results-heading p{flex-basis:100%;order:2}
.result-tools{min-width:0;max-width:100%}
.result-tools:empty{display:none}
.result-tools:has(.copy-fallback){flex-basis:100%}
.copy-button{min-height:44px;font-size:14px;padding:8px 12px}
.text-button{display:inline-block;min-height:44px;padding:8px 0;color:var(--ocean);background:transparent;border:0;text-decoration:underline;text-underline-offset:3px;text-align:left}
.text-button:hover{background:transparent;color:var(--ink)}
.reuse-result{font-size:13px;margin-top:2px}
.completion-status{display:flex;flex-wrap:wrap;align-items:center;gap:0 14px;margin:12px 0 0;font-size:14px;color:var(--ocean)}
.completion-status:empty,#data-status:empty{display:none}
.availability-notice{padding:12px;border-left:3px solid var(--amber);background:#fff8e9;font-size:15px;margin:0 0 16px}
.copy-fallback{max-width:100%;margin-top:10px;font-size:14px}
.copy-fallback textarea{display:block;width:100%;max-width:100%;font:inherit;margin-top:6px;padding:8px;color:var(--ink);border:1px solid #668592}
.result-card.empty-result{min-height:0}
.empty-result .empty-time{font-size:38px;margin:12px 0 7px}
#converter-results-section,#pace-results-section{scroll-margin-top:18px}
.distance-presets{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,3.2rem),1fr));gap:6px;margin-top:8px}
.preset{padding:7px 4px;min-height:44px;font-size:14px;border-color:#668592}
.preset[aria-pressed=true]{background:var(--pool);border-color:var(--ocean)}
.unit-option{border-color:#668592;padding:8px 5px;min-width:0}
.unit-option input{flex-shrink:0}
.unit-options{grid-template-columns:repeat(auto-fit,minmax(min(100%,6.5rem),1fr))}
@media(max-width:800px){.results-heading{display:flex}}
@media(max-width:620px){
  .header-inner{padding-top:10px}.brand{font-size:23px}.main-nav{margin-top:5px}.main-nav a{min-height:44px}
  .calculator-page .page-intro{padding:20px 0 18px}.calculator-page .page-intro>.eyebrow{display:none}
  .calculator-page .page-intro h1{margin-bottom:9px}.calculator-page .page-intro .lead{font-size:16px}
  .calculator-page .input-panel{padding:16px}.calculator-page .panel-heading{margin-bottom:14px}
  .calculator-page .field{margin-bottom:12px}.calculator-page fieldset{margin-bottom:12px}
  .calculator-page .field-hint{margin-top:5px}.calculator-page .form-footnote{margin-top:12px}
  .workspace{gap:22px}.result-card{padding:18px;min-height:0}.pace-card{padding:22px}
  .calculator-page .results-heading{gap:6px 12px}
}