:root { --blue:#0d55f4; --blue-deep:#053bb4; --navy:#071e3f; --cream:#f7f3eb; }
html { scroll-padding-top:110px; }
body { overflow-x:hidden; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible { outline:3px solid #57b9ff; outline-offset:3px; }
.skip-link { position:fixed; z-index:1000; top:-90px; left:16px; background:white; color:var(--blue-deep); padding:10px 16px; border-radius:0 0 10px 10px; font-weight:800; }
.skip-link:focus { top:0; }
.powered-strip { background:#08294d; color:white; font-size:12px; letter-spacing:.08em; text-transform:uppercase; font-weight:800; }
.powered-inner { min-height:38px; display:flex; align-items:center; justify-content:flex-end; gap:12px; }
.powered-inner img { width:100px; height:auto; display:block; object-fit:contain; filter:brightness(0) invert(1); }
.site-header { position:sticky; top:0; z-index:30; background:rgba(255,255,255,.97); backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px); box-shadow:0 1px 0 rgba(10,42,84,.1),0 8px 22px rgba(7,30,63,.06); }
.top-nav a[aria-current="page"] { color:var(--blue); }
.mobile-nav:not([hidden]) { position:fixed; top:110px; z-index:35; }
.breadcrumbs { display:flex; align-items:center; flex-wrap:wrap; gap:8px; padding-top:11px; padding-bottom:11px; font-size:13px; color:#5b6d83; background:var(--cream); }
.breadcrumbs a { color:var(--blue-deep); font-weight:700; }
.breadcrumbs a:hover { text-decoration:underline; }
.breadcrumbs span[aria-current="page"] { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; max-width:50vw; }
.hero-meta span { display:inline-flex; align-items:center; gap:8px; font-size:14px; font-weight:700; color:#e4f1ff; }
.hero-meta span::before { content:'✦'; display:grid; place-items:center; width:28px; height:28px; border:1px solid rgba(255,255,255,.45); border-radius:9px; color:#c9f3ff; }
.hero-image { background-image:linear-gradient(90deg,var(--blue) 0%,rgba(13,85,244,.16) 42%,rgba(6,40,109,.1) 100%),url('/images/hero-yacht.jpg'); }
.feature-photo { display:block; width:100%; height:470px; object-fit:cover; }
.home-links { display:flex; flex-wrap:wrap; align-items:center; gap:24px; margin-top:28px; }
.home-links a, .chapter-end-links a, .contact-links a { color:var(--blue); font-weight:800; }
.home-links a:hover, .chapter-end-links a:hover, .contact-links a:hover { text-decoration:underline; }
.pathway-cards { display:grid; gap:13px; }
.pathway-card { background:white; border:1px solid #d9e4f8; border-radius:16px; padding:18px 20px; display:flex; gap:18px; }
.pathway-card > span { display:grid; place-items:center; width:38px; height:38px; flex:none; background:var(--blue); color:white; border-radius:10px; font-family:'Plus Jakarta Sans',Arial,sans-serif; font-weight:800; }
.pathway-card h3 { margin:0; font:800 17px/1.35 'Plus Jakarta Sans',Arial,sans-serif; }
.pathway-card p { margin:5px 0 10px; font-size:14px; line-height:1.48; }
.pathway-links { display:flex; flex-wrap:wrap; gap:7px; }
.pathway-links a { background:#eef4ff; padding:5px 9px; border-radius:7px; color:var(--blue-deep); font-size:12px; font-weight:800; }
.pathway-links a:hover { background:#dcecff; }
.home-final { padding-top:96px; padding-bottom:96px; display:grid; grid-template-columns:1.1fr .9fr; gap:65px; align-items:center; }
.home-final img { width:100%; height:auto; aspect-ratio:16/9; object-fit:cover; border-radius:24px; box-shadow:0 26px 48px rgba(7,30,63,.12); }
.home-final h2 { font:800 clamp(36px,4vw,56px)/1.1 'Plus Jakarta Sans',Arial,sans-serif; letter-spacing:-.055em; margin:12px 0 18px; }
.home-final p { font-size:18px; color:var(--muted); }
.site-footer { display:grid; grid-template-columns:auto minmax(260px,1fr) auto; align-items:start; gap:40px; }
.footer-copy { max-width:510px; }
.footer-copy strong { color:white; display:block; margin-bottom:8px; font-size:14px; }
.footer-copy p { line-height:1.55; }
.footer-links { display:grid; grid-template-columns:repeat(3,auto); column-gap:20px; row-gap:8px; }
.footer-links a { font-size:13px; }
.course-top.top-with-image { display:flex; align-items:stretch; min-height:245px; overflow:hidden; padding:0; }
.course-top.top-with-image .container { padding-top:50px; padding-bottom:48px; width:100%; position:relative; z-index:1; }
.course-top.top-with-image img { width:34%; min-width:300px; height:auto; object-fit:cover; mask-image:linear-gradient(90deg,transparent,black 24%); }
.course-top.top-with-image .page-title, .course-top.top-with-image p { max-width:760px; }
.course-body { grid-template-columns:285px minmax(0,1fr); gap:30px; }
.course-sidebar { top:108px; max-height:calc(100vh - 126px); overflow:auto; }
.course-sidebar details { border-bottom:1px solid var(--line); }
.course-sidebar summary { list-style:none; cursor:pointer; padding:15px 18px; display:flex; align-items:center; gap:8px; font-size:14px; font-weight:800; }
.course-sidebar summary::-webkit-details-marker { display:none; }
.course-sidebar summary:hover, .course-sidebar details[open] summary { background:#eef5ff; color:var(--blue-deep); }
.course-sidebar summary span:first-child { color:var(--blue); font-size:11px; white-space:nowrap; }
.course-sidebar summary span:last-child { margin-left:auto; font-size:20px; transition:transform .15s; }
.course-sidebar details[open] summary span:last-child { transform:rotate(180deg); }
.sidebar-title { display:flex; justify-content:space-between; gap:10px; align-items:center; }
.sidebar-title span { color:var(--blue); font:800 12px/1.4 'DM Sans',Arial,sans-serif; white-space:nowrap; }
.sidebar-lessons { display:grid; padding:5px 12px 14px; }
.sidebar-lessons a { padding:8px; display:flex; align-items:center; gap:9px; color:#52657d; font-size:13px; line-height:1.35; border-radius:8px; }
.sidebar-lessons a:hover,.sidebar-lessons a.current { background:#e5f0ff; color:var(--blue-deep); font-weight:800; }
.lesson-content { min-width:0; }
.lesson-content .lesson-breadcrumb { margin-bottom:12px; }
.lesson-content .lesson-deck { margin-bottom:14px; }
.lesson-content .chapter-article { margin-top:38px; }
.lesson-content h2:not(.related-panel h2) { letter-spacing:-.04em; }
.lesson-content a:not(.lesson-row):not(.related-grid a):not(.source-grid a):not(.button-primary):not(.complete-button):not(.source-link):not(.next-link) { color:var(--blue-deep); }
.lesson-content a:hover { text-decoration:underline; }
.course-index .index-part { border-top:1px solid var(--line); padding-top:35px; margin-top:45px; }
.course-index .index-part:first-of-type { border-top:0; margin-top:0; }
.course-index .index-part h2 { font:800 29px/1.2 'Plus Jakarta Sans',Arial,sans-serif; margin:9px 0 7px; }
.course-index .index-part > p { color:var(--muted); margin:0 0 22px; }
.concept-graphic { margin:34px 0 38px; border:1px solid #cbdcf8; border-radius:17px; background:#f4f8ff; padding:22px; }
.concept-graphic figcaption { color:#123e7d; font:800 17px/1.3 'Plus Jakarta Sans',Arial,sans-serif; margin-bottom:18px; }
.concept-graphic p { color:#52657d; font-size:13px; margin:16px 0 0; }
.system-flow { display:flex; align-items:stretch; gap:13px; }
.system-flow a { display:grid; gap:7px; flex:1; padding:18px; background:white; border:1px solid #cfddf4; border-radius:12px; text-decoration:none; }
.system-flow a:hover { border-color:var(--blue); text-decoration:none; }
.system-flow a small { color:var(--blue); font-weight:800; letter-spacing:.1em; }
.system-flow a strong { font:800 16px/1.35 'Plus Jakarta Sans',Arial,sans-serif; color:var(--navy); }
.system-flow a span { color:#54708c; font-size:12px; }
.system-junction { display:grid; place-items:center; color:var(--blue-deep); font-weight:800; }
.steps-graphic ol { list-style:none; padding:0; display:grid; grid-template-columns:repeat(4,1fr); gap:9px; }
.steps-graphic li { display:grid; gap:10px; background:white; border:1px solid #d3e2fb; border-radius:12px; padding:15px; color:#274263; font-size:13px; font-weight:800; }
.steps-graphic li b { background:var(--blue); color:white; width:32px; height:32px; border-radius:9px; display:grid; place-items:center; }
.tide-bars { display:grid; grid-template-columns:repeat(6,1fr); gap:10px; align-items:end; min-height:192px; }
.tide-bars > div { display:flex; flex-direction:column; align-items:center; justify-content:end; min-width:0; gap:5px; }
.tide-bars span { display:block; width:100%; border-radius:7px 7px 0 0; background:linear-gradient(180deg,#41c8f4,var(--blue)); }
.tide-bars strong { color:#123e7d; font-size:13px; }
.tide-bars small { color:#60758d; font-size:11px; }
.lesson-pager,.lesson-pager a { color:var(--blue); }
.lesson-pager { display:flex; flex-wrap:wrap; gap:14px; text-align:right; }
.lesson-pager a { font-weight:800; font-size:14px; }
.lesson-pager a:hover { text-decoration:underline; }
.related-panel { margin-top:55px; padding-top:37px; border-top:1px solid var(--line); }
.related-panel h2 { font:800 30px/1.2 'Plus Jakarta Sans',Arial,sans-serif; margin:8px 0 22px; }
.related-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.related-grid a { position:relative; display:flex; flex-direction:column; gap:8px; padding:19px; min-height:178px; border:1px solid #dce7f6; border-radius:14px; background:#f8fbff; text-decoration:none; }
.related-grid a:hover { border-color:#9ebcf3; background:#edf5ff; text-decoration:none; }
.related-grid span { color:var(--blue); font-size:12px; font-weight:800; }
.related-grid strong { font:800 15px/1.3 'Plus Jakarta Sans',Arial,sans-serif; color:var(--navy); }
.related-grid small { color:#61738a; font-size:12px; line-height:1.4; }
.related-grid b { position:absolute; right:15px; top:15px; color:var(--blue); }
.chapter-end-links { display:flex; flex-wrap:wrap; gap:20px; border-top:1px solid var(--line); padding-top:22px; margin-top:28px; font-size:14px; }
.reference-intro { color:#425873; font-size:17px; line-height:1.7; margin:0 0 27px; }
.source-group { margin:37px 0 0; padding-top:24px; border-top:1px solid var(--line); }
.source-group h2 { font:800 25px/1.25 'Plus Jakarta Sans',Arial,sans-serif; margin:0 0 12px; }
.source-group p { color:#52657d; margin:0 0 18px; }
.source-grid a { text-decoration:none; }
.source-grid a strong { font-weight:800; }
.source-grid a:hover { text-decoration:none; }
.glossary-item h2 { font:800 17px/1.25 'Plus Jakarta Sans',Arial,sans-serif; margin:0 0 7px; color:var(--blue-deep); }
.simple-page { max-width:1050px; padding-top:65px; padding-bottom:100px; }
.simple-page h2 { font:800 28px/1.3 'Plus Jakarta Sans',Arial,sans-serif; letter-spacing:-.035em; margin:0 0 15px; }
.simple-page p { color:#405672; font-size:17px; line-height:1.78; }
.simple-page a:not(.button-primary) { color:var(--blue-deep); font-weight:800; }
.simple-page a:hover { text-decoration:underline; }
.simple-page section { margin-top:43px; padding-top:33px; border-top:1px solid var(--line); }
.simple-page .disclaimer-lead { background:#fff7e8; border:1px solid #eddcb6; border-left:5px solid #e2a52a; border-radius:0 14px 14px 0; padding:26px 30px; }
.disclaimer-lead strong { color:#6e4d07; font:800 24px/1.2 'Plus Jakarta Sans',Arial,sans-serif; }
.disclaimer-lead p { margin-bottom:0; }
.simple-actions { display:flex; gap:22px; align-items:center; flex-wrap:wrap; margin-top:42px; }
.simple-actions .button-primary { padding:13px 20px; }
.contact-layout { display:grid; max-width:1240px; grid-template-columns:.75fr 1fr; gap:90px; align-items:start; }
.contact-layout > div > h2 { font-size:33px; }
.contact-links { display:grid; gap:10px; margin-top:28px; }
.contact-form { border:1px solid #dbe7f7; box-shadow:0 18px 45px rgba(7,30,63,.08); background:white; border-radius:20px; padding:34px; display:grid; }
.contact-form h2 { margin-bottom:4px; }
.contact-form p { font-size:14px; line-height:1.55; margin:0 0 24px; }
.contact-form label { color:#2f4a6b; font-size:14px; font-weight:800; margin:16px 0 7px; }
.contact-form input,.contact-form textarea { width:100%; border:1px solid #b9c9df; background:#fbfdff; padding:12px 13px; border-radius:9px; color:var(--navy); font:inherit; }
.contact-form input:focus,.contact-form textarea:focus { border-color:var(--blue); }
.contact-form textarea { resize:vertical; min-height:135px; }
.contact-form button { border:0; margin-top:23px; padding:14px 20px; cursor:pointer; }
.contact-form .form-help { margin:12px 0 0; min-height:20px; }
@media (max-width:1100px) {
  .site-footer { grid-template-columns:1fr 1fr; }
  .footer-links { grid-column:1 / -1; }
  .course-body { grid-template-columns:245px minmax(0,1fr); gap:20px; }
  .related-grid { grid-template-columns:1fr; }
  .related-grid a { min-height:0; }
}
@media (max-width:760px) {
  html { scroll-padding-top:86px; }
  .powered-inner { min-height:30px; justify-content:center; font-size:10px; }
  .powered-inner img { width:76px; }
  .site-header { top:0; }
  .mobile-nav:not([hidden]) { top:102px; }
  .hero-image { background-image:linear-gradient(180deg,rgba(13,85,244,.96) 0%,rgba(13,85,244,.79) 53%,rgba(13,85,244,.24) 100%),url('/images/hero-yacht.jpg'); }
  .hero-meta { gap:13px; }
  .hero-meta span { font-size:11px; }
  .hero-meta span::before { width:22px; height:22px; }
  .feature-photo { height:290px; }
  .home-final { grid-template-columns:1fr; gap:28px; padding-top:60px; padding-bottom:70px; }
  .home-final p { font-size:16px; }
  .site-footer { grid-template-columns:1fr; gap:12px; }
  .footer-links { grid-column:auto; grid-template-columns:repeat(3,auto); margin-top:12px; }
  .course-top.top-with-image { display:block; }
  .course-top.top-with-image .container { padding-top:41px; padding-bottom:36px; }
  .course-top.top-with-image img { display:none; }
  .course-body { grid-template-columns:1fr; }
  .course-sidebar { max-height:none; overflow:visible; }
  .sidebar-lessons { display:grid; }
  .system-flow { display:grid; }
  .system-junction { height:22px; }
  .steps-graphic ol { grid-template-columns:repeat(2,1fr); }
  .contact-layout { grid-template-columns:1fr; gap:30px; }
  .contact-form { padding:25px 20px; }
  .simple-page { padding-top:45px; padding-bottom:65px; }
}
@media (max-width:480px) {
  .breadcrumbs { font-size:11px; }
  .hero-meta span:last-child { display:none; }
  .footer-links { grid-template-columns:repeat(2,auto); }
  .related-grid { gap:9px; }
  .tide-bars { gap:4px; }
  .tide-bars small { font-size:9px; }
  .concept-graphic { padding:17px; }
  .steps-graphic li { padding:11px; }
}
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto !important; transition-duration:.01ms !important; animation-duration:.01ms !important; } }