:root{--oa-body:Arial,Helvetica,sans-serif;--oa-heading:Arial,Helvetica,sans-serif;--oa-accent:Georgia,'Times New Roman',serif;--oa-nav:'Courier New',monospace;--sans:var(--oa-body);--serif:var(--oa-accent);--ink:#183b4b;--paper:#fff;--snow:#fff}html{color-scheme:light}body{font-family:var(--oa-body)!important;background:#fff;color:#183b4b}h1,h2,h3,h4,.card h3,.reader-body h1,.d-body h2,.page-head h1{font-family:var(--oa-heading)!important}h1,h2{font-weight:400}h1 em,h2 em{font-family:var(--oa-accent)!important;font-weight:400}button,input,select,textarea{font-family:var(--oa-body)}.brand,.site-brand{font:800 13px/1.05 var(--oa-body)!important;letter-spacing:1px;color:#17333e!important;display:flex;align-items:center;gap:11px;text-decoration:none!important;flex-shrink:0}.brand svg,.site-brand svg{width:35px!important;height:35px!important;flex-shrink:0}.topbar nav.main a,.shared-header nav a{font-family:var(--oa-nav)!important}.shared-header{position:sticky!important;top:0;z-index:40;display:flex!important;align-items:center;justify-content:space-between;min-height:81px!important;height:auto!important;padding:14px 4%!important;gap:20px;background:#fff!important;color:#183b4b!important;border-bottom:1px solid #d3e1e8}.shared-header .site-nav{display:flex;align-items:center;gap:15px}.shared-header .site-nav a{display:flex!important;align-items:center;min-height:44px;font-size:10px!important;line-height:1.5;text-transform:uppercase;text-decoration:none;letter-spacing:.3px}.shared-header details.mobile-menu{display:none;position:static}.shared-header summary{list-style:none;cursor:pointer;min-height:44px;display:flex;align-items:center;padding:8px 16px;border:1px solid #c4d7e1;border-radius:24px;font:700 12px var(--oa-nav)}.shared-header .mobile-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #cbdde6;padding:10px 4%;display:flex;flex-direction:column;gap:0}.shared-header .mobile-nav a{display:flex!important;min-height:46px;align-items:center;font:600 14px/1.5 var(--oa-body)!important;text-decoration:none;padding:7px 12px}.shared-header details:not([open]) .mobile-nav{display:none}.shared-header :is(a,summary):focus-visible{outline:3px solid #e87946;outline-offset:3px}.gateway-hero{position:relative!important;isolation:isolate;display:grid!important;grid-template-columns:1fr!important;align-content:center!important;justify-items:center!important;min-height:calc(100svh - 81px);padding:75px 5% 100px!important;text-align:center!important;background:#edf4f7!important;overflow:hidden}.gateway-hero:after{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,#ffffffdc,#ffffffe8 46%,#ffffffd9 75%,#ffffffb8)}.gateway-hero>figure{position:absolute!important;inset:0;margin:0!important;border:0!important;border-radius:0!important;z-index:-2;background:#e5f0f5}.gateway-hero>figure img{width:100%!important;height:100%!important;object-fit:cover!important;object-position:center 48%;opacity:1}.gateway-hero>figure figcaption{position:absolute;bottom:0;left:0;right:0;text-align:center;background:#ffffffef;color:#365b6c!important;padding:12px 5%;font:11px/1.6 var(--oa-body);z-index:3}.gateway-hero>div{width:100%;max-width:1200px;margin:0 auto!important;opacity:1!important;filter:none!important}.gateway-hero h1{font:400 clamp(64px,8.7vw,130px)/.97 var(--oa-heading)!important;letter-spacing:-5px!important;margin:25px auto 28px!important;max-width:1200px;text-align:center!important;color:#183b4b!important}.gateway-hero h1 em{color:#3e687d!important}.gateway-hero p.gateway-lede{font:400 clamp(17px,1.55vw,21px)/1.75 var(--oa-body)!important;color:#294b5d!important;opacity:1!important;max-width:760px!important;margin:0 auto!important;text-shadow:none!important;mix-blend-mode:normal!important}.gateway-hero .eyebrow{color:#355b6d!important;text-align:center!important}.gateway-hero .gateway-actions{justify-content:center!important;margin:30px auto!important;gap:15px}.gateway-hero .gateway-small{color:#3d6071!important;font-size:12px;opacity:1!important}.gateway-hero .btn{min-height:48px;font:700 12px/1.4 var(--oa-nav)!important}.gateway-hero .btn:not(.primary){background:#ffffffd9!important;color:#183b4b!important;border-color:#476c7e!important}.card .body,.reader-body,.d-body,.facts,.watch-body,.entry-discussion{font-family:var(--oa-body)!important}.card .meta{color:#496b7d}.map-history-card,.map-workbench button{font-family:var(--oa-body)!important}@media(max-width:1060px){.shared-header{min-height:72px!important}.shared-header .site-nav{display:none!important}.shared-header details.mobile-menu{display:block}.gateway-hero{min-height:calc(100svh - 72px);padding-top:60px!important}.gateway-hero h1{font-size:clamp(54px,9vw,100px)!important;letter-spacing:-3px!important}}@media(max-width:600px){.shared-header{padding:12px 5%!important}.brand,.site-brand{font-size:11px!important}.brand svg,.site-brand svg{width:31px!important;height:31px!important}.gateway-hero{padding:42px 5% 95px!important;min-height:calc(100svh - 72px)}.gateway-hero h1{font-size:clamp(42px,11vw,66px)!important;line-height:1.04!important;letter-spacing:-2px!important;margin:22px auto!important}.gateway-hero .gateway-lede{font-size:17px!important}.gateway-hero .gateway-actions{gap:10px;margin:24px auto!important;max-width:380px}.gateway-hero .btn{width:100%;justify-content:center}.gateway-hero>figure img{object-position:57% center}.gateway-hero>figure figcaption{font-size:10px}.gateway-hero .eyebrow{font-size:10px;letter-spacing:.7px}.gateway-hero .gateway-small{max-width:310px;margin:auto;line-height:1.6}}

/* Keep documentary credit above the atmospheric image wash. */
.gateway-hero:after{display:none}.gateway-hero>figure{z-index:-1}.gateway-hero>figure:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,#ffffffb8,#ffffffd9 46%,#ffffffbd 75%,#ffffff88);pointer-events:none}.gateway-hero>figure figcaption{z-index:2;opacity:1!important}
.home-field-guide{padding:80px 5%;max-width:1500px;margin:auto}.restored-mission{text-align:center;padding:0 0 65px}.restored-mission h2{font-size:clamp(38px,5vw,68px);line-height:1.05;letter-spacing:-2px;margin:22px 0}.field-guide-title{font-size:clamp(36px,4.5vw,60px);line-height:1.07;margin:20px 0}.home-field-guide .overview-lead{max-width:720px;font-size:18px;line-height:1.7;color:#345665}.home-field-guide .overview-route{display:flex;flex-wrap:wrap;gap:20px;padding:22px 0 35px}.home-field-guide .overview-map-feature{display:grid;grid-template-columns:1fr 1fr;background:#edf5f7;text-decoration:none;margin:20px 0 35px;border:1px solid #ccdde5}.overview-map-feature>img{width:100%;height:100%;max-height:420px;object-fit:contain;background:#e7eff4}.overview-map-feature>div{padding:35px;align-self:center}.overview-map-feature h2{font-size:clamp(32px,4vw,52px);line-height:1.1;margin:20px 0}.overview-map-feature p{line-height:1.7}.overview-map-feature small{display:block;margin-top:15px;line-height:1.6}.home-field-guide .overview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.home-field-guide .overview-card{position:relative;padding:28px 24px 45px;border:1px solid #c9dce6;background:#fff;text-decoration:none;transition:background .2s}.overview-card:hover{background:#edf5f7}.overview-card>span{font:11px var(--oa-nav);letter-spacing:1px}.overview-card h2{font-size:28px;margin:22px 0 14px}.overview-card p{font-size:15px;line-height:1.7;color:#3c5e70}.overview-card>b{position:absolute;right:24px;bottom:20px}.home-field-guide a:focus-visible{outline:3px solid #db744d;outline-offset:4px}@media(max-width:800px){.home-field-guide .overview-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.home-field-guide{padding:55px 5%}.home-field-guide .overview-map-feature,.home-field-guide .overview-grid{grid-template-columns:1fr}.overview-map-feature>img{height:290px}.overview-map-feature>div{padding:25px}.restored-mission{padding-bottom:45px}.home-field-guide .overview-route{flex-direction:column;gap:14px}.home-field-guide .overview-card{padding:25px 22px 38px}}
[hidden]{display:none!important}
/* v12: original mission + four image gateways + map feature, before the field guide. */
.home-pathways{padding:55px 5%;background:#fff;color:#244a5d}.home-pathways>h2{font-size:clamp(38px,5vw,68px);line-height:1.05;letter-spacing:-2px;font-weight:400;margin:24px 0 55px}.home-pathways>p{max-width:750px;font-size:16px;line-height:1.7;color:#557686}.home-path-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin-top:30px}.home-path-grid a{padding:0 0 24px;border:1px solid #c8dce5;background:#f5fafc;text-decoration:none;overflow:hidden}.home-path-grid img{display:block;width:100%;height:210px;object-fit:cover;background:#edf4f7}.home-path-grid a:nth-child(2) img,.home-path-grid a:nth-child(3) img{object-fit:contain;padding:10px}.home-path-grid small{display:block;font:9px/1.6 var(--oa-nav);color:#537180;padding:10px 20px;border-bottom:1px solid #d1e1e7}.home-path-grid b{display:block;font-size:20px;font-weight:400;margin-bottom:14px;padding:20px 20px 0}.home-path-grid span{display:block;padding:0 20px;font-size:13px;line-height:1.7;color:#526e7e}.home-pathways .overview-map-feature{display:grid;grid-template-columns:42% 58%;max-width:1000px;margin:30px 0 0;background:#edf5f7;border:1px solid #c8dce5;text-decoration:none}.home-pathways .overview-map-feature>img{max-height:320px;object-fit:contain;align-self:center;padding:35px;background:transparent}.home-pathways .overview-map-feature>div{padding:35px 30px 35px 15px}.home-field-guide{border-top:1px solid #d6e4ea}.home-field-guide .overview-card h2{margin-top:0}.home-field-guide .overview-card{background:#f7fafb}.home-pathways a:focus-visible{outline:3px solid #d66b40;outline-offset:4px}.home-pathways .eyebrow,.home-field-guide>.eyebrow{font:11px/1.6 var(--oa-nav);letter-spacing:1px;text-transform:uppercase}@media(max-width:1000px){.home-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.home-path-grid{grid-template-columns:1fr}.home-path-grid img{height:240px}.home-pathways .overview-map-feature{grid-template-columns:1fr}.home-pathways .overview-map-feature>img{height:280px;padding:25px}.home-pathways .overview-map-feature>div{padding:25px}.home-pathways>h2{margin-bottom:32px}}
/* Measured v25 type: body16/24.8 Arial; nav11/17.05 Courier,400,1.2px tracking. */
body{font-size:16px;line-height:1.55}.topbar nav.main a,.shared-header .site-nav a{font-family:'Courier New',monospace!important;font-size:11px!important;font-weight:400!important;line-height:17.05px!important;letter-spacing:1.2px!important;text-transform:uppercase;padding:0!important;min-height:44px;border:0!important;border-radius:0!important;background:none!important;color:#244a5d!important}.topbar nav.main a[aria-current=page],.shared-header .site-nav a[aria-current=page]{text-decoration:underline!important;text-underline-offset:6px}.topbar nav.main ul{gap:22px!important}.topbar nav.main,.shared-header .site-nav{gap:22px!important}.topbar{position:relative;max-width:none!important;width:100%!important}.shared-header{position:relative!important}.gateway-hero h1{font-size:clamp(48px,5.5vw,88px)!important;font-weight:500!important;line-height:.91!important;letter-spacing:-4px!important}.gateway-hero h1 em{font-weight:400!important;letter-spacing:-4px!important}.gateway-hero p.gateway-lede{font-size:16px!important;line-height:1.7!important}@media(min-width:1280px){.topbar nav.main,.shared-header .site-nav{position:absolute!important;left:50%;transform:translateX(-50%);width:max-content;margin:0!important}.topbar,.shared-header{min-height:81px!important}}@media(min-width:1061px) and (max-width:1279px){.topbar,.shared-header{display:flex!important;flex-wrap:wrap!important;justify-content:center!important;gap:0!important;padding-top:15px!important;padding-bottom:8px!important}.topbar .brand,.shared-header .brand{margin:0 auto 8px!important}.topbar nav.main,.shared-header .site-nav{position:static!important;transform:none!important;width:100%;justify-content:center!important}.topbar nav.main ul{justify-content:center!important}.topbar .menu-btn{display:none!important}.topbar .tag{display:none!important}}@media(max-width:1060px){.topbar{justify-content:space-between!important}.topbar nav.main a{font-family:Arial,Helvetica,sans-serif!important;font-size:14px!important;line-height:21.7px!important;font-weight:600!important;letter-spacing:0!important;padding:10px 12px!important;text-transform:none}.topbar nav.main ul{gap:0!important}.gateway-hero h1{font-size:clamp(48px,7vw,76px)!important}}@media(max-width:600px){.gateway-hero h1{font-size:clamp(42px,11vw,60px)!important;letter-spacing:-2.5px!important;line-height:.97!important}.gateway-hero h1 em{letter-spacing:-2.5px!important}}
@media(max-width:1060px){.topbar .menu-btn{display:inline-flex!important;min-height:44px}.topbar nav.main{display:none!important;position:absolute!important;top:100%;left:0;right:0;transform:none!important;width:100%;background:#fff;z-index:50}.topbar nav.main.open{display:block!important}.topbar nav.main ul{display:flex!important;flex-direction:column!important;padding:12px}.topbar .tag{display:none!important}}
/* v13: preserve complete archive frames and visible provenance. */
.card .thumb img[style*="contain"]{padding:8px;background:#edf4f7}.card .image-note{font-size:11px;line-height:1.5;background:#fff;color:#274f63}.d-hero>a{display:inline-block;margin:8px 18px 15px;color:#234f64;text-decoration:underline}.d-hero>.d-credit{margin:0;padding:10px 20px;line-height:1.65}.supporting-grid figure{margin:0;padding:12px;border:1px solid #d4e2e9}.supporting-grid img{width:100%;height:auto;max-height:600px;object-fit:contain}.supporting-grid figcaption,.supporting-grid p{font-size:13px;line-height:1.6}.supporting-grid a{display:inline-block;margin:10px 12px 0 0}.preview-consent{padding:18px;border:1px solid #c8dde6;background:#f4f8fa;margin-bottom:25px}.preview-consent p{font-size:14px;line-height:1.7}.card .thumb:has(.video-preview-trigger){display:flex;flex-direction:column;justify-content:center;align-items:center;padding:20px;text-align:center;gap:12px}.video-preview-trigger{border:1px solid #476c7e;background:#fff;color:#244a5d;padding:12px 16px;min-height:44px;cursor:pointer}.card .thumb iframe{width:100%;height:100%;aspect-ratio:16/9;border:0}.card:has(.video-preview-trigger),article.card{cursor:default}article.card .btn{margin-top:15px;min-height:44px}.card .body>.display-subtitle{font-size:12px;color:#4b6e7f}