:root{color-scheme:dark;--navy:#000066;--panel:#071b43;--yellow:#ffff00;--blue:#77c9ef;--line:#385b91;--cream:#f2dfac}
*{box-sizing:border-box}
html{scroll-behavior:smooth;text-size-adjust:100%;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--navy);color:var(--yellow);font-family:Arial,Helvetica,sans-serif;font-size:18px;line-height:1.8}
a{color:var(--blue);text-underline-offset:4px;overflow-wrap:anywhere}
a:hover{color:var(--cream)}
a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:4px}
.page-header{text-align:center;max-width:1040px;margin:auto;padding:30px 16px 10px}
.masthead-links{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 12px;font-size:18px}
.masthead-links a{display:inline-block;padding:4px 0}
.class-banner{display:block;width:100%;max-width:none;height:auto;margin:auto}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
main{width:min(100% - 32px,1000px);margin:auto}
.content>p{margin:22px auto;text-align:left}
figure{margin:20px auto;text-align:center;min-width:0}
figure img{display:block;max-width:100%;width:auto;height:auto;margin:auto;border-radius:8px;box-shadow:0 5px 18px #0004}
figcaption,.caption{font-size:16px;line-height:1.6;margin:8px auto 0;color:var(--cream);text-align:center;max-width:780px}
.photo-grid,.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:center;gap:20px;margin:24px 0}
.photo-grid figure,.feature-grid figure{margin:0}
.badges{max-width:640px;margin:26px auto}
.badges img{max-height:210px}
.feature-grid blockquote{margin:0;padding:24px;border:1px solid var(--line);border-radius:12px;background:var(--panel);font-weight:bold;text-align:center;font-size:21px;line-height:1.6}
.feature-grid cite{display:block;font-style:normal;font-size:16px;color:var(--cream);margin-top:12px}
.badge-story p{text-align:left;margin:0}
h2{font-size:clamp(24px,2.5vw,29px);color:var(--cream);text-align:center;line-height:1.3;margin:36px 0 18px}
.dive{text-align:center;padding:22px 12px;background:var(--panel);border:1px solid var(--line);border-radius:12px;margin:32px 0}
.dive h2{margin:0 0 8px}.dive p{margin:2px 0 16px}
.dive button{font:inherit;font-weight:bold;color:var(--navy);background:var(--yellow);border:0;border-radius:8px;padding:10px 20px;cursor:pointer}
.dive-frames{display:grid;justify-content:center;gap:14px;margin-top:26px}
.dive-frames figure{margin:0}.dive-frames img{box-shadow:none}
.dive-frames figcaption{font-size:16px;margin:4px auto 0}
.audio-status{font-size:16px;color:var(--cream);min-height:1.6em;margin:12px 0 0!important}
.specs{margin:30px 0}.specs dl{margin:0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.specs dl>div{display:grid;grid-template-columns:minmax(160px,24%) 1fr;background:var(--panel);border-bottom:1px solid var(--line)}
.specs dl>div:last-child{border:0}.specs dt,.specs dd{margin:0;padding:12px 18px}
.specs dt{font-weight:bold;border-right:1px solid var(--line)}
.related{margin:36px 0}.related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;max-width:780px;margin:auto}
.related a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 18px;min-width:0;text-decoration:none;font-weight:bold}
.related a:hover{background:#102958;border-color:var(--blue)}
.related a span{display:block;color:var(--cream);font-size:16px;line-height:1.5;font-weight:normal;margin-top:5px}
.site-footer{max-width:1000px;margin:32px auto 0;padding:24px 16px 32px;border-top:2px solid var(--cream);text-align:center;font-size:16px;line-height:1.7}
.footer-links{display:flex;justify-content:center;gap:12px 28px;flex-wrap:wrap}
.footer-links a{display:inline-block;padding:6px 0}
.creator-credit{margin:16px auto}.disclaimer{font-size:16px;line-height:1.7;max-width:900px;margin:18px auto}
.copyright{font-weight:bold;border-top:1px solid var(--line);padding-top:14px}
@media(max-width:680px){body{font-size:19px;line-height:1.75}main{width:min(100% - 28px,1000px)}.page-header{padding:20px 14px 8px}.photo-grid,.feature-grid,.related-grid{grid-template-columns:1fr;gap:18px}.feature-grid blockquote{padding:18px;font-size:20px}.badge-story p{padding:4px 0}.badges{grid-template-columns:repeat(2,minmax(0,1fr))}.badges img{max-height:190px}.specs dl>div{grid-template-columns:125px 1fr}.specs dt,.specs dd{padding:10px}.footer-links{flex-direction:column;gap:4px}.dive{padding:20px 8px}}
@media(max-width:380px){.specs dl>div{grid-template-columns:110px 1fr}.specs dt,.specs dd{padding:10px 8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:#fff;color:#000}.masthead-links,.dive button,.audio-status{display:none}a,figcaption,.caption,h2,.disclaimer,.feature-grid cite{color:#000}.feature-grid blockquote,.dive,.specs dl>div,.related a{background:transparent}figure{break-inside:avoid}}

.intro{margin:22px auto 32px;padding:18px 24px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}
.intro p{margin:10px 0;text-align:left}.intro .era{color:var(--cream);text-align:center;font-weight:bold;letter-spacing:.08em;margin:0 0 14px}
.photo-help{font-size:16px;color:var(--cream);text-align:center!important;margin:20px auto}
.photo-link{display:block;text-decoration:none;border-radius:8px}.photo-link:hover img{outline:2px solid var(--blue);outline-offset:3px}
.specs dd{overflow-wrap:anywhere}.admiralty-drawing{max-width:1024px;margin:32px auto}.admiralty-drawing img{width:100%;height:auto}
.viewer{max-width:1100px;margin:0 auto;padding:20px 16px 0}.viewer h1{font-size:clamp(24px,4vw,34px);line-height:1.3;text-align:center;color:var(--cream);margin:16px auto 24px}
.viewer figure{margin:24px auto}.viewer img{max-width:100%;height:auto;margin:auto;display:block}.viewer figcaption{max-width:850px;font-size:18px;line-height:1.7;margin:18px auto 0}
.viewer-nav{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:24px auto;font-size:18px}.viewer-nav a{padding:8px 0}
@media(max-width:680px){.intro{padding:16px}.viewer{padding:14px}.viewer figcaption{font-size:18px}.viewer-nav{justify-content:center;text-align:center}}