/* Approved W431 composition; only the swimming page is scoped here. */
#st334Content:has(#swim431){width:86.5%;max-width:1120px;padding-left:0;padding-right:0}
#st334Content:has(#swim431)>.st-master-intro{display:none}

#swim431{--ink:#000066;--text:#536eae;--muted:#6b80b5;--line:#c9def8;--paper:#fff;--soft:#f4f9ff;--blue:#0768ff;--green:#e2fbee;--green-line:#b2ebd2;font:clamp(12px,1.1vw,14px)/1.45 Arial,sans-serif;color:var(--text);background:var(--paper)}
#swim431 *{box-sizing:border-box}#swim431 [hidden]{display:none!important}#swim431 h2,#swim431 h3{color:var(--ink);line-height:1.2;letter-spacing:-.4px;margin:0 0 10px}#swim431 h2{font-size:clamp(17px,1.8vw,22px)}#swim431 h3{font-size:clamp(16px,1.6vw,20px)}#swim431 p{margin:7px 0 10px}#swim431 .intro{font:15px/1.4 Arial,Helvetica,sans-serif;color:#06266e;margin:0 8px 10px;padding-top:8px}#swim431 a{color:var(--blue);text-decoration:none}#swim431 a:hover{text-decoration:underline}#swim431 .hint{font-size:clamp(10px,1vw,12px);line-height:1.45;color:var(--muted)}#swim431 button,#swim431 input,#swim431 select{font:inherit;touch-action:manipulation}#swim431 button{color:var(--blue);background:var(--paper);border:1px solid #89b8ff;border-radius:4px;padding:8px 12px;line-height:1.25;cursor:pointer}#swim431 button:hover{background:var(--soft);border-color:var(--blue)}#swim431 button.primary{color:#fff;background:#0768ff;border-color:#0768ff}#swim431 button:disabled{opacity:.5;cursor:not-allowed}#swim431 button:focus-visible,#swim431 input:focus-visible,#swim431 select:focus-visible,#swim431 a:focus-visible,#swim431 summary:focus-visible,#swim431 .error:focus-visible{outline:3px solid #88b9ff;outline-offset:3px}#swim431 [id],#swim431 button,#swim431 summary{scroll-margin-top:165px}#swim431 .panel{border:1px solid var(--line);background:var(--paper);border-radius:5px;padding:clamp(10px,1.1vw,14px);min-width:0}#swim431 input,#swim431 select{width:100%;min-width:0;background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:4px;padding:7px 9px;line-height:1.25}#swim431 select{padding-right:22px}
#swim431 .modes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-bottom:8px}#swim431 .mode{display:flex;align-items:center;gap:10px;min-width:0;height:clamp(92px,9.2vw,116px);padding:6px 10px;text-align:left;border-color:var(--line);color:var(--ink);overflow:hidden}#swim431 .mode.selected{border-color:#0768ff;box-shadow:inset 0 0 0 1px #0768ff;background:#fbfdff}#swim431 .swim-art{display:block;width:42%;height:100%;max-height:96px;flex:0 0 42%;overflow:hidden}#swim431 .mode>span{min-width:0;flex:1}#swim431 .mode b{display:block;font-size:clamp(14px,1.45vw,18px);line-height:1.3;letter-spacing:-.35px}#swim431 .mode small{display:block;color:var(--text);font-size:clamp(11px,1.1vw,13px);line-height:1.35;margin-top:5px}
#swim431 .main-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:8px;align-items:stretch}#swim431 .field{display:grid;grid-template-columns:28% minmax(0,1fr);gap:8px;align-items:center;margin-bottom:10px}#swim431 .field>div{min-width:0}#swim431 .unit-row{display:flex;gap:6px}#swim431 .unit-row>input{flex:1;min-width:0}#swim431 .units{display:flex;flex:0 0 47%;gap:3px}#swim431 .units button{flex:1;min-width:0;padding:7px 9px;border-color:var(--line)}#swim431 .units .selected,#swim431 .distance-chips .selected{color:#fff;background:#0768ff;border-color:#0768ff}#swim431 .distance-chips{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}#swim431 .distance-chips button{padding:5px 7px}#swim431 .quick-field{margin-bottom:9px}#swim431 .time-fields{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}#swim431 .time-fields>div{min-width:0}#swim431 .time-fields label{display:block;font-size:clamp(10px,.95vw,12px);line-height:1.35;margin:0 0 4px}#swim431 .custom-row{display:flex;gap:6px}#swim431 .custom-row select{width:64px;flex:0 0 64px}#swim431 .form-actions{display:grid;grid-template-columns:1.1fr .9fr;gap:7px;margin:10px 0}#swim431 .form-actions button{padding:8px 7px}#swim431 .input-panel>.hint{margin:7px 0 0}#swim431 .error:empty{margin:0}#swim431 .error:not(:empty){font-size:12px;color:#b32238;padding:9px;border:1px solid currentColor;border-radius:4px}#swim431 .input-panel{display:flex;flex-direction:column}#swim431 .swimmer-photo{display:block;position:relative;line-height:0;margin:auto 0 0;width:100%;overflow:hidden;border-radius:4px;background:#dceff9}#swim431 .swimmer{display:block;width:100%;height:auto;aspect-ratio:2/1;object-fit:cover}#swim431 .watermark{position:absolute;right:9px;bottom:8px;width:96px;max-width:24%;height:auto;opacity:.4;filter:drop-shadow(0 1px 1px #253848);pointer-events:none}
#swim431 .right-column{display:flex;flex-direction:column;gap:8px;min-width:0}#swim431 .dashboard{padding-bottom:7px}#swim431 .dashboard[aria-disabled=true]{opacity:.6}#swim431 .result{background:var(--green);border:1px solid var(--green-line);border-radius:4px;text-align:center;padding:12px 10px 10px;color:var(--ink)}#swim431 .result>b{display:block;font-size:clamp(12px,1.15vw,14px)}#swim431 .result>strong{display:block;font-size:clamp(50px,6vw,72px);line-height:1.12;letter-spacing:-1.5px;margin:5px 0 6px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}#swim431 .result>strong small{font-size:clamp(18px,2.1vw,26px);letter-spacing:-.6px;white-space:nowrap}#swim431 .result>p{font-size:clamp(10px,1.1vw,13px);margin:0;color:var(--text)}#swim431 .metrics{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:8px}#swim431 .metrics>div{border:1px solid var(--line);border-radius:4px;padding:8px 10px;min-width:0}#swim431 .metrics b{display:block;color:var(--ink);font-size:clamp(11px,1.1vw,13px)}#swim431 .metrics strong{display:block;color:var(--ink);font-size:clamp(22px,2.5vw,30px);line-height:1.2;margin:3px 0 2px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}#swim431 .metrics small{display:block;color:var(--text);font-size:clamp(10px,1vw,12px)}#swim431 .count-note{margin:7px 0 0;font-size:clamp(9px,.9vw,11px)}#swim431 .projections{flex:1;padding-bottom:8px}#swim431 #swimProjection>div{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:6px 10px;color:var(--ink);background:var(--soft);border-bottom:1px solid var(--line);font-size:clamp(14px,1.5vw,18px);line-height:1.4}#swim431 #swimProjection>div:first-child{border-radius:4px 4px 0 0}#swim431 #swimProjection>div:last-child{border-bottom:0;border-radius:0 0 4px 4px}#swim431 #swimProjection strong{font-weight:400}#swim431 #swimProjection b{font-weight:400}#swim431 .projections>.hint{margin:7px 0 0;font-size:clamp(9px,.95vw,11px)}
#swim431 .export-actions{display:grid;grid-template-columns:1.05fr .95fr;gap:8px;margin:8px 0 0}#swim431 .export-actions button{width:100%;padding:8px 7px}#swim431 .export-status{font-size:11px;margin:6px 0 0}#swim431 .export-status:empty{margin:0}#swim431 .explorer{margin-top:9px;padding-bottom:5px}#swim431 .explorer h2{margin-bottom:4px}#swim431 .explorer-grid{display:grid;grid-template-columns:3fr 1fr;gap:12px;align-items:center}#swim431 .pool-visual{position:relative;min-width:0;line-height:0}#swim431 .pool-visual>img{display:block;width:100%;height:auto;aspect-ratio:4.5/1;object-fit:contain}#swim431 .pool-arrow{position:absolute;inset:0;width:100%;height:100%;overflow:visible}#swim431 .pool-copy{min-width:0;align-self:stretch;display:flex;flex-direction:column;justify-content:center}#swim431 .pool-copy h3{font-size:clamp(18px,1.9vw,23px);margin:0 0 6px}#swim431 .pool-copy p{font-size:clamp(10px,1vw,12px);line-height:1.45;margin:0 0 4px}#swim431 .pool-copy small{display:block;margin-top:auto;padding-top:8px;font-size:clamp(8px,.75vw,9px);text-align:right;color:var(--muted)}
#swim431 .lower-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:9px}#swim431 .lower-grid h2{margin-bottom:8px}#swim431 .table-scroll{overflow-x:auto}#swim431 table{border-collapse:collapse;width:100%;font-size:clamp(10px,1vw,12px);line-height:1.3;text-align:left;color:var(--text)}#swim431 th{color:var(--ink);font-weight:bold;background:#eaf4ff}#swim431 th,#swim431 td{padding:3px 12px;border-bottom:1px solid var(--line);white-space:nowrap}#swim431 tbody tr:last-child td{border-bottom:0}#swim431 .splits>.hint{font-size:clamp(9px,.95vw,11px);margin:5px 0 0}#swim431 .stroke-tag{display:inline-block;padding:5px 15px;background:var(--soft);border:1px solid var(--line);border-radius:4px;font-size:clamp(11px,1vw,13px);color:var(--blue)}#swim431 .guidance ul{padding-left:20px;font-size:clamp(11px,1.1vw,13px);line-height:1.7;margin:8px 0 0}#swim431 .guidance li{margin:0 0 3px}#swim431 .assumptions{margin-top:9px}#swim431 .assumptions h2{margin-bottom:5px}#swim431 .assumptions dl{margin:0;font-size:clamp(10px,1vw,12px)}#swim431 .assumptions dl>div{display:grid;grid-template-columns:180px minmax(0,1fr);gap:8px}#swim431 .assumptions dt,#swim431 .assumptions dd{margin:0}#swim431 .assumptions p{font-size:clamp(10px,1vw,12px);margin:3px 0 0}#swim431 .faq{margin-top:9px;padding-top:10px;padding-bottom:10px}#swim431 .faq h2{margin-bottom:4px}#swim431 .faq details{border:1px solid var(--line);border-radius:4px;padding:4px 10px;margin-top:4px}#swim431 summary{cursor:pointer;color:var(--ink);font-size:clamp(11px,1vw,13px);line-height:1.4}#swim431 .faq p{font-size:12px;line-height:1.7;margin-bottom:3px}
#swim431 .sources{margin-top:10px}#swim431 .sources h2{margin-bottom:5px}#swim431 .source-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}#swim431 .source-grid>a{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:4px;padding:10px;min-width:0;text-decoration:none}#swim431 .source-grid>a:hover{background:var(--soft);border-color:var(--blue)}#swim431 .source-logo{display:flex;align-items:center;justify-content:center;flex:0 0 42%;height:64px;border-right:1px solid var(--line);padding-right:10px;min-width:0}#swim431 .source-logo img{display:block;max-width:100%;width:100%;height:56px;object-fit:contain}#swim431 .source-grid b{display:block;color:var(--ink);font-size:clamp(9px,.95vw,11px);line-height:1.4}#swim431 .source-grid small{display:block;color:var(--text);font-size:clamp(9px,.9vw,10px);line-height:1.4;margin-top:4px}#swim431 .small-print{text-align:center;font-size:clamp(8px,.8vw,9px);color:var(--muted);margin:5px 0 0}
#swim431 .related{padding:12px 0 8px}#swim431 .related-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:6px}#swim431 .related-heading h2{margin:0}#swim431 .related-heading>a{font-size:clamp(10px,1vw,12px);white-space:nowrap}#swim431 .related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}#swim431 .related-grid>a{display:flex;align-items:center;gap:10px;min-width:0;border:1px solid var(--line);border-radius:4px;padding:7px 10px;min-height:90px;text-decoration:none}#swim431 .related-grid>a:hover{border-color:var(--blue);background:var(--soft)}#swim431 .related-grid .swim-art{width:37%;flex-basis:37%;height:78px}#swim431 .related-grid b{display:block;color:var(--ink);font-size:clamp(11px,1.2vw,14px);line-height:1.35}#swim431 .related-grid small{display:block;color:var(--text);font-size:clamp(10px,1vw,12px);line-height:1.4;margin-top:4px}#swim431 .sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
html.st-master-dark #swim431{--ink:#e9f2ff;--text:#c3d3e9;--muted:#a3b7d1;--line:#365371;--paper:#102235;--soft:#172d44;--blue:#83baff;--green:#153f30;--green-line:#3c7158;color-scheme:dark}html.st-master-dark #swim431 .intro{color:var(--text)}html.st-master-dark #swim431 .mode.selected{background:#17334f}html.st-master-dark #swim431 th{background:#1d3552}html.st-master-dark #swim431 .error:not(:empty){color:#ffb3c1}html.st-master-dark #swim431 .source-logo{background:#fff;padding:5px 8px;border-radius:3px}html.st-master-dark #swim431 .swim-art{filter:brightness(1.13) drop-shadow(0 0 .4px #c9def2)}
@media(max-width:820px){#st334Content:has(#swim431){width:calc(100% - 28px)}#swim431 .main-grid{grid-template-columns:1fr}#swim431 .mode{gap:6px;padding:6px;height:100px}#swim431 .mode b{font-size:13px}#swim431 .mode small{font-size:10px}#swim431 .result>strong{font-size:58px}#swim431 .swimmer-photo{max-width:550px;margin:0 auto}#swim431 .source-grid,#swim431 .related-grid{grid-template-columns:1fr}#swim431 .source-logo{flex-basis:110px}#swim431 .source-grid b{font-size:13px}#swim431 .source-grid small{font-size:11px}#swim431 .related-grid>a{min-height:100px;padding:12px;gap:16px}#swim431 .related-grid .swim-art{width:105px;flex-basis:105px;height:75px}#swim431 .related-grid b{font-size:15px}#swim431 .related-grid small{font-size:12px}#swim431 .lower-grid{grid-template-columns:1fr}#swim431 .explorer-grid{grid-template-columns:1fr}#swim431 .pool-copy small{text-align:right}#swim431 .pool-visual>img{aspect-ratio:4/1}#swim431 .pool-copy{display:block}#swim431 .explorer{padding-bottom:10px}}
@media(max-width:540px){#swim431 .modes{gap:7px}#swim431 .mode{flex-direction:column;text-align:center;justify-content:flex-start;height:144px;padding:6px 4px;gap:4px}#swim431 .mode .swim-art{width:80px;flex:0 0 67px;height:67px;max-height:67px}#swim431 .mode b{font-size:12px}#swim431 .mode small{font-size:10px;margin-top:4px}#swim431 .panel{padding:12px}#swim431 h2{font-size:18px}#swim431 .field{grid-template-columns:27% minmax(0,1fr)}#swim431 .field label,#swim431 .field>span{font-size:11px}#swim431 input,#swim431 select{font-size:12px}#swim431 .time-fields{gap:5px}#swim431 .time-fields label{font-size:10px}#swim431 .units{flex-basis:42%}#swim431 .units button{padding:7px 4px;font-size:11px}#swim431 .distance-chips button{font-size:11px}#swim431 .result>strong{font-size:48px;letter-spacing:-1px}#swim431 .result>strong small{font-size:18px}#swim431 .metrics strong{font-size:25px}#swim431 .export-actions button{font-size:12px}#swim431 .watermark{width:84px;right:7px;bottom:7px}#swim431 .assumptions dl>div{grid-template-columns:125px minmax(0,1fr);gap:5px}#swim431 .related-heading{flex-direction:column;align-items:flex-start;gap:5px}#swim431 .source-logo img{height:55px}}

/* W427 reference notice standard: consistent composition; topic-specific copy only.
   Source attribution does not imply certification, endorsement or clinical review. */
#swim431 .st-reference-notice{--ref-shield-paper:#f5faff;--ref-shield-inner:#e1efff;--ref-shield-layer:#cde4fb;display:grid;grid-template-columns:minmax(0,1fr) 205px;gap:20px;align-items:center;padding:16px 20px;border:1px solid var(--line);border-radius:8px;background:linear-gradient(105deg,#f8fafc,#eff6ff);margin-bottom:14px}
#swim431 .st-reference-copy{min-width:0}
#swim431 .st-reference-notice h2{font-size:17px;line-height:1.35;margin:0 0 6px;letter-spacing:-.2px}
#swim431 .st-reference-notice p{font-size:12px;line-height:1.6;margin:0}
#swim431 .st-reference-notice .reference-disclaimer{margin-top:5px;font-size:11px}
#swim431 .st-reference-link{display:inline-block;margin-top:7px;font-size:12px;line-height:1.5}
#swim431 .st-reference-seal{align-self:stretch;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding-left:20px;border-left:1px solid var(--line);color:var(--ink)}
#swim431 .st-reference-shield{display:block;width:64px;height:72px;flex:none;margin:0 0 6px}
#swim431 .st-reference-seal b{font-size:10px;line-height:1.4;letter-spacing:.15px}
#swim431 .st-reference-seal small{display:block;font-size:9px;line-height:1.5;margin-top:4px;color:var(--muted)}
html.st-master-dark #swim431 .st-reference-notice{--ref-shield-paper:#17334f;--ref-shield-inner:#234b70;--ref-shield-layer:#305b81;background:linear-gradient(105deg,#142a41,#193652)}
@media(max-width:820px){#swim431 .st-reference-notice{grid-template-columns:minmax(0,1fr) 165px;gap:14px;padding:14px 16px}#swim431 .st-reference-seal{padding-left:14px}}
@media(max-width:540px){#swim431 .st-reference-notice{grid-template-columns:minmax(0,1fr) 102px;gap:10px;padding:12px}#swim431 .st-reference-notice h2{font-size:14px}#swim431 .st-reference-notice p{font-size:11px}#swim431 .st-reference-notice .reference-disclaimer{font-size:10px}#swim431 .st-reference-seal{padding-left:10px}#swim431 .st-reference-shield{width:47px;height:53px}#swim431 .st-reference-seal b{font-size:8px;letter-spacing:0}#swim431 .st-reference-seal small{font-size:8px}#swim431 .st-reference-link{font-size:11px}}

#swim431 .st-reference-notice{padding:12px 16px;margin:12px 0;gap:12px}#swim431 .st-reference-copy h2{font-size:14px}#swim431 .st-reference-shield{width:48px;height:54px}
/* Swimming content only; shared header/navigation retain their global standard. */
@media(min-width:821px){
#swim431 .st-reference-notice{grid-template-columns:minmax(0,1fr) 140px;padding:9px 16px;border-radius:4px;margin:9px 0}
#swim431 .st-reference-notice h2{font-size:16px;margin-bottom:3px}
#swim431 .st-reference-notice p{font-size:12px;line-height:1.4}
#swim431 .st-reference-notice .reference-disclaimer{margin-top:1px}
#swim431 .st-reference-link{font-size:12px;margin-top:1px}
#swim431 .st-reference-shield{width:40px;height:44px;margin-bottom:3px}
#swim431 .st-reference-seal{padding-left:12px}
#swim431 .st-reference-seal b{font-size:8px}
#swim431 .st-reference-seal small{font-size:8px;margin-top:0}
#swim431 h2{margin-bottom:6px}
#swim431 .panel{padding:8px 10px}
#swim431 .result{padding:8px 8px 7px}
#swim431 .metrics>div{padding:5px 8px}
#swim431 .metrics strong{margin:2px 0 1px}
#swim431 #swimProjection>div{padding:5px 10px}
#swim431 .projections{padding-bottom:5px}
#swim431 .field{margin-bottom:8px}
#swim431 .field label{margin-bottom:0}
#swim431 .quick-field{margin-bottom:6px}
#swim431 .input-panel>.hint{margin:0}
#swim431 .form-actions{margin:8px 0}
#swim431 .swimmer-photo{margin:auto 0 0}
#swim431 .guidance ul{line-height:1.55}
#swim431 .faq{padding-top:7px;padding-bottom:7px}
#swim431 .faq details{padding:2px 10px;margin-top:3px}
#swim431 .related{padding-top:9px}
#swim431 .source-grid>a{padding:6px 8px}
#swim431 .source-logo{height:56px}
#swim431 .related-grid>a{min-height:75px;padding:5px 10px}
#swim431 .related-grid .swim-art{height:65px}
}
#swim431 .pool-illustration{display:block;width:100%;height:auto;overflow:hidden}
#swim431 .faq summary{list-style:none;position:relative;padding-right:18px}
#swim431 .faq summary::-webkit-details-marker{display:none}
#swim431 .faq summary:after{content:'⌄';position:absolute;right:0;top:-2px;color:var(--blue);font-size:17px}
#swim431 .faq details[open]>summary:after{content:'⌃'}
@media(min-width:821px){#swim431 .explorer{padding-bottom:4px}#swim431 .lower-grid{margin-top:7px}#swim431 .st-reference-notice{min-height:90px}#swim431 .st-reference-notice p{line-height:1.3}#swim431 .st-reference-notice h2{line-height:1.2}#swim431 .st-reference-link{line-height:1.3}#swim431 .st-reference-notice{padding-top:6px;padding-bottom:6px}#swim431 .st-reference-notice .reference-disclaimer{font-size:12px}}

/* W432: assumptions and FAQ share one desktop row. */
#swim431 .details-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;align-items:stretch;margin-top:9px}
#swim431 .details-grid>.assumptions,#swim431 .details-grid>.faq{margin-top:0;min-width:0}
#swim431 .details-grid .assumptions dl>div{grid-template-columns:42% minmax(0,1fr);gap:6px}
#swim431 .details-grid .assumptions dd{overflow-wrap:anywhere}
@media(max-width:820px){#swim431 .details-grid{grid-template-columns:1fr}}