:root{--paper:#ECEFEC;--ink:#263431;--muted:#5E7069;--line:#CCD5CE;--hero:#243B3B;--hero-text:#F1F4EE;--hero-muted:#C6D2C8;--accent:#D98255;--button-text:#222E2B;--sea:#B8D2C4;--panel:#F7F9F5;--footer:#DDE4DC;--about-text:#435A51;--button-hover:#E79D77;--hero-soft:#BCCFC3;--focus:#D98255}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit}button,select{font:inherit}a,button,select,summary,canvas{outline-offset:5px}a:focus-visible,button:focus-visible,select:focus-visible,summary:focus-visible,canvas:focus-visible{outline:3px solid var(--focus)}.skip{position:absolute;left:20px;top:-80px;z-index:2000;background:white;padding:15px}.skip:focus{top:10px}.masthead{height:86px;display:flex;align-items:center;justify-content:space-between;padding:0 5%;border-bottom:1px solid var(--line)}.brand{text-decoration:none;font-weight:750;letter-spacing:.16em;font-size:16px;display:flex;align-items:center;gap:16px}.brand-detail{font-size:10px;font-weight:400;letter-spacing:.12em;opacity:.65}nav{display:flex;gap:32px;font-size:12px}nav a{text-decoration:none}nav a:hover,.source-link:hover{text-decoration:underline}.hero{background:var(--hero);color:var(--hero-text);display:grid;grid-template-columns:1fr 1fr;padding:68px 7% 44px;gap:5%;overflow:hidden}.eyebrow{font-size:10px;letter-spacing:.17em;font-weight:650;display:flex;align-items:center;gap:12px;margin:0 0 24px}.line{width:28px;height:1px;background:var(--sea)}h1{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:clamp(45px,4.8vw,76px);font-weight:400;letter-spacing:-.04em;line-height:1.03;margin:0 0 26px}h1 em{color:var(--sea);font-weight:400}.intro{max-width:410px;color:var(--hero-muted);font-size:14px;line-height:1.8}.button{display:inline-flex;gap:48px;align-items:center;background:var(--accent);color:var(--button-text);text-decoration:none;padding:17px 21px;font-size:12px;font-weight:600;margin-top:18px}.button:hover{background:var(--button-hover)}.archive-label{font-size:10px;color:var(--hero-soft);letter-spacing:.03em;margin-top:30px}.archive-label span{display:inline-block;width:6px;height:6px;border-radius:100%;background:var(--sea);margin-right:7px}.hero-chart{align-self:center;position:relative}.hero-chart svg{width:100%;max-height:510px}.svg-label{fill:#a8c1be;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:9px;letter-spacing:2px}.hero-caption{display:flex;justify-content:space-between;border-top:1px solid #426065;padding-top:18px;color:var(--hero-soft);font-size:10px}.hero-caption span:first-child{letter-spacing:.12em}.section{padding:72px 7% 0}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:30px}.section-heading .eyebrow{margin-bottom:15px;color:var(--muted)}h2{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:clamp(29px,3vw,43px);font-weight:400;letter-spacing:-.035em;margin:0}.section-heading>p{font-size:12px;line-height:1.8;color:var(--muted);margin:0}.explorer-toolbar{display:flex;gap:25px;align-items:center;background:var(--panel);padding:18px 22px;border:1px solid var(--line);border-bottom:none}.field{display:flex;gap:14px;align-items:center}.field label{font-size:11px}.muted{color:var(--muted)}select{border:1px solid var(--line);padding:9px 30px 9px 12px;background:var(--paper);color:var(--ink);font-size:12px;border-radius:2px;max-width:230px}.text-button{margin-left:auto;border:0;background:none;color:var(--ink);cursor:pointer;font-size:11px;white-space:nowrap}.map-shell{height:540px;position:relative;border:1px solid var(--line);background:#d8e4e2}#map{height:100%;width:100%;z-index:1}.map-tag{position:absolute;top:22px;left:22px;z-index:500;background:var(--panel);padding:12px 14px;font-size:10px;letter-spacing:.13em;box-shadow:0 3px 10px #102c3410}.map-tag span{margin-left:16px;color:var(--muted);font-size:9px}.reading{position:absolute;bottom:24px;left:24px;background:var(--panel);z-index:500;padding:22px;min-width:255px;max-width:330px;box-shadow:0 6px 24px #102c3414;border-left:3px solid #438a78;pointer-events:none}.reading .eyebrow{font-size:9px;margin-bottom:10px}.reading strong{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:28px;font-weight:400}.reading p:not(.eyebrow){font-size:11px;line-height:1.6;margin:8px 0 0;color:var(--muted)}#map-status{position:absolute;top:48%;left:50%;transform:translateX(-50%);z-index:550;background:var(--panel);padding:18px;font-size:12px;max-width:90%}#map-status[hidden]{display:none}.legend-row{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:18px 0 0}.legend-row>p,.small-note{font-size:10px;line-height:1.7;color:var(--muted)}#legend{display:flex;gap:14px;flex-wrap:wrap;font-size:10px}#legend span{white-space:nowrap}#legend i{display:inline-block;width:16px;height:4px;margin-right:5px;vertical-align:middle}.small-note{margin-top:12px}.measurement-summary{border-top:1px solid var(--line);display:flex;gap:65px;padding:26px 0 12px}.measurement-summary>div{display:flex;flex-direction:column;gap:10px}.measurement-summary span{font-size:10px;color:var(--muted)}.measurement-summary strong{font-weight:400;font-size:21px}.chart-wrap{height:260px;margin-top:12px}#chart{width:100%;height:100%;cursor:crosshair}.about{display:grid;grid-template-columns:1fr 1fr;gap:10%;margin-top:60px;padding-top:60px;padding-bottom:72px;border-top:1px solid var(--line)}.about p:not(.eyebrow){font-size:14px;line-height:1.9;margin-top:0;color:var(--about-text)}.about details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin:25px 0}.about summary{cursor:pointer;font-size:12px}.about details p{font-size:12px!important;margin:16px 0 0!important}.source-link{display:block;font-size:12px;margin-top:18px;text-underline-offset:5px}footer{padding:28px 5%;background:var(--footer);display:flex;align-items:center;justify-content:space-between;gap:20px}footer p,footer>a{font-size:11px}footer .brand{font-size:12px}.leaflet-control-attribution{font-size:9px!important}.leaflet-container{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.leaflet-control-zoom a{color:var(--ink)!important}.leaflet-popup-content{line-height:1.7}button:hover{opacity:.75}@media(min-width:1500px){main{max-width:1800px;margin:auto}.hero{padding-top:80px}}@media(max-width:900px){.field{display:block}.field label{display:block;margin-bottom:8px}.hero{padding:45px 6%}.hero-caption span:last-child{display:none}.section{padding-left:5%;padding-right:5%}.section-heading>p{max-width:220px}.explorer-toolbar{gap:15px}.map-tag span{display:none}}@media(max-width:600px){.masthead{height:70px}.brand-detail{display:none}nav{gap:17px}nav a:last-child{display:none}.hero{grid-template-columns:1fr;padding:40px 6% 30px;gap:20px}h1{font-size:51px}.intro{font-size:13px}.hero-chart{margin-top:6px}.hero-chart svg{height:290px}.hero-caption span:last-child{display:block}.archive-label{margin-bottom:0}.section{padding-top:45px}.section-heading{display:block}.section-heading>p{max-width:none;margin-top:16px}.explorer-toolbar{padding:15px 12px;gap:10px;flex-wrap:wrap}.field{flex:1}.field label{font-size:10px}.field .muted{display:none}select{width:100%;max-width:none;font-size:11px;padding-left:7px}.text-button{margin-left:0}.map-shell{height:470px}.map-tag{top:12px;left:12px}.reading{bottom:23px;left:12px;min-width:220px;padding:15px}.reading strong{font-size:24px}.legend-row{display:block}#legend{gap:10px}.measurement-summary{gap:25px;flex-wrap:wrap}.measurement-summary strong{font-size:18px}.about{grid-template-columns:1fr;gap:25px;margin-top:35px;padding-bottom:45px}footer{align-items:start;flex-wrap:wrap}footer p{margin:0}footer>a{margin-left:auto}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}


/* A shorter introduction; the track and readings do the talking. */
.hero{padding-top:46px;padding-bottom:38px;align-items:center}
h1{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:clamp(36px,4vw,58px);line-height:1.1;letter-spacing:-.04em;font-weight:600}
h1 em{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-weight:400}
.hero-chart svg{max-height:350px}.intro{max-width:430px;font-size:15px;line-height:1.7}
.team-intro{margin-top:22px!important}.crew-list{font-size:12px!important;line-height:1.9!important}.about h2{font-size:34px}.about>div>.eyebrow{color:var(--muted)}
@media(max-width:600px){.hero{padding-top:34px;padding-bottom:26px}h1{font-size:43px}.hero-chart svg{height:235px}.hero-caption{padding-top:12px}.about h2{font-size:29px}}

.observations>.section-heading{align-items:center;margin-bottom:12px}.observations>.section-heading .eyebrow{margin:0}.observations .measurement-summary{margin-top:16px;padding-top:20px;padding-bottom:8px}

/* A single system-font family and a quiet vessel wordmark. */
body{line-height:1.55}h1,h2{font-weight:550;letter-spacing:-.035em}h1{font-size:clamp(42px,5vw,68px);margin-bottom:22px}h1 em{font-family:inherit;font-weight:inherit}
.brand{font-size:24px;font-weight:600;letter-spacing:-.035em;gap:7px}.vessel-prefix{font-size:.58em;letter-spacing:.08em;font-weight:500;align-self:baseline;margin-top:.18em}.masthead .brand{align-items:baseline}footer .brand{font-size:18px;align-items:baseline}
.hero{padding-top:48px;padding-bottom:42px}.explore{padding-top:48px}.section-heading h2{font-size:clamp(26px,2.6vw,36px)}.reading strong{font-weight:500;font-variant-numeric:tabular-nums}.measurement-summary strong{font-variant-numeric:tabular-nums}
@media(max-width:600px){.masthead .brand{font-size:23px}h1{font-size:45px}.hero{padding-top:32px;padding-bottom:28px}.explore{padding-top:32px}.section-heading h2{font-size:27px}}

/* Page palettes are independent of pollutant colours and the basemap. */
.svg-label{fill:var(--hero-soft)}.hero-caption{border-color:color-mix(in srgb,var(--hero-soft) 35%,transparent)}
#hero-route path{stroke:var(--sea)}#hero-route circle{fill:var(--hero-text)}#hero-land path[fill]:not([fill="none"]){fill:var(--sea)}#hero-land path[stroke]{stroke:var(--hero-soft)}
#theme-tester{position:fixed;right:18px;bottom:18px;width:310px;max-width:calc(100vw - 32px);z-index:1500;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:5px;box-shadow:0 5px 30px #0002;font-size:12px;line-height:1.5}
#theme-tester summary{cursor:pointer;padding:12px 16px;font-weight:600;user-select:none}.theme-tester-body{padding:0 16px 14px}.theme-tester-body label{display:block;font-size:11px;color:var(--muted);margin-bottom:5px}
#theme-choice{max-width:none;width:100%;background:var(--paper);color:var(--ink)}.theme-swatches{display:flex;height:20px;margin-top:12px;gap:4px}.theme-swatches span{flex:1;border:1px solid #0001;border-radius:2px}.theme-description{min-height:36px;color:var(--muted);margin:9px 0}
.theme-test-controls{display:flex;gap:6px;flex-wrap:wrap}.theme-test-controls button{border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:6px 9px;font-size:11px;border-radius:2px;cursor:pointer}.theme-exit{margin-left:auto}.theme-test-hint{font-size:10px;color:var(--muted);margin:10px 0 0}
@media(max-width:600px){#theme-tester{bottom:10px;right:10px;width:280px}.theme-description{min-height:0}.theme-test-hint{margin-top:7px}}

/* A quiet chart inset with a brighter voyage trace. */
.hero-chart{padding:18px 20px 16px;background:color-mix(in srgb,var(--hero) 84%,#000);border:1px solid color-mix(in srgb,var(--hero-soft) 24%,transparent);border-radius:4px}
.hero-chart svg{display:block;margin:0 auto}
#hero-land path[fill]:not([fill="none"]){fill-opacity:.13}
#hero-land path[stroke]{stroke:var(--hero-soft);stroke-opacity:.8;stroke-width:1}
#hero-route path{stroke:var(--accent);stroke-width:2.8;stroke-opacity:1;filter:drop-shadow(0 0 3px color-mix(in srgb,var(--accent) 30%,transparent))}
#hero-route circle{fill:var(--hero-text);stroke:var(--accent);stroke-width:1.8}
.hero-chart .svg-label{fill:var(--hero-text)}
.hero-chart .hero-caption{margin-top:10px;padding-top:12px}
@media(max-width:600px){.hero-chart{padding:12px 12px 14px}}

.hero-copy .button>span[aria-hidden="true"]{display:inline-block;transform:scale(1.08)}