:root {
  --deep: #061c2d;
  --navy: #0b3048;
  --water: #087f8c;
  --aqua: #32c7cc;
  --mist: #e8f4f3;
  --foam: #f7faf8;
  --white: #fff;
  --signal: #d51f2b;
  --ink: #142a33;
  --muted: #587079;
  --line: #bfd3d4;
  --sand: #efc86e;
  --max: 74rem;
  --text: 46rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--foam); color: var(--ink); font-family: "Avenir Next", "Trebuchet MS", sans-serif; line-height: 1.65; }
body, a { letter-spacing: 0; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.skip { position: absolute; left: -9999px; z-index: 20; padding: .8rem 1rem; background: var(--white); }
.skip:focus { left: .5rem; }
.topbar { position: sticky; top: 0; z-index: 10; background: var(--white); border-bottom: 1px solid var(--line); }
.nav { max-width: var(--max); min-height: 5rem; margin: auto; padding: .7rem 1.25rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { color: var(--navy); font-size: 1.35rem; font-weight: 800; line-height: 1; text-decoration: none; }
.brand small { display: block; margin-top: .3rem; color: var(--water); font-size: .61rem; letter-spacing: .24em; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 1.25rem; font-size: .86rem; font-weight: 700; }
.nav-links a { text-decoration: none; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--water); }
.nav-links .register { padding: .58rem .8rem; background: var(--signal); color: var(--white); text-transform: uppercase; font-size: .71rem; }
.nav-links .register:hover, .nav-links .register:focus-visible { background: #ab1420; color: var(--white); }
.knowledge-hero { min-height: 35rem; display: flex; align-items: flex-end; color: var(--white); background: linear-gradient(90deg, rgba(4,23,38,.97), rgba(4,23,38,.82) 52%, rgba(4,23,38,.18)), url("openwater.png") center 40% / cover; border-bottom: 7px solid var(--aqua); }
.knowledge-hero .inner, .article-hero .inner { width: 100%; max-width: var(--max); margin: auto; padding: 5.5rem 1.25rem 4.5rem; }
.eyebrow { margin: 0 0 .8rem; color: #99e6e3; font-size: .74rem; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 52rem; margin-bottom: 1rem; font-size: clamp(2.7rem, 6.5vw, 5.5rem); line-height: .98; }
.lead { max-width: 44rem; margin: 0; color: #e4f4f1; font-size: clamp(1rem, 2vw, 1.2rem); }
.section { max-width: var(--max); margin: auto; padding: 5rem 1.25rem; }
.section-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: 3rem; align-items: end; margin-bottom: 2rem; }
.kicker { margin: 0 0 .6rem; color: var(--water); font-size: .74rem; font-weight: 800; letter-spacing: .17em; text-transform: uppercase; }
h2 { margin-bottom: .8rem; color: var(--navy); font-size: clamp(1.8rem, 4vw, 3.1rem); line-height: 1.08; }
.section-head > p { margin: 0; color: var(--muted); font-size: 1.03rem; }
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.topic-card { min-height: 20rem; padding: 1.45rem; display: flex; flex-direction: column; background: var(--white); border: 1px solid var(--line); border-top: 5px solid var(--water); text-decoration: none; transition: transform .2s ease, box-shadow .2s ease; }
.topic-card:nth-child(2n) { border-top-color: var(--sand); }
.topic-card:hover, .topic-card:focus-visible { transform: translateY(-.3rem); box-shadow: 0 14px 28px rgba(6,28,45,.12); outline: none; }
.topic-card .number { margin-bottom: 2rem; color: var(--water); font-size: .7rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.topic-card h3 { margin-bottom: .55rem; color: var(--navy); font-size: 1.25rem; line-height: 1.2; }
.topic-card p { color: var(--muted); font-size: .88rem; }
.topic-card strong { margin-top: auto; color: var(--water); font-size: .83rem; }
.path-band { background: var(--deep); color: var(--white); }
.path-band h2 { color: var(--white); }
.paths { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #355465; border-left: 1px solid #355465; }
.path { padding: 1.5rem; border-right: 1px solid #355465; border-bottom: 1px solid #355465; }
.path h3 { margin-bottom: .4rem; color: var(--aqua); font-size: 1rem; }
.path p { color: #bad0d3; font-size: .86rem; }
.path a { color: var(--white); font-weight: 800; text-decoration-color: var(--aqua); }
.article-hero { color: var(--white); background: var(--deep); border-bottom: 7px solid var(--aqua); }
.article-hero h1 { max-width: 58rem; font-size: clamp(2.35rem, 5vw, 4.5rem); }
.article-wrap { max-width: var(--max); margin: auto; padding: 4rem 1.25rem 5rem; display: grid; grid-template-columns: minmax(0, var(--text)) 15rem; gap: 5rem; align-items: start; }
.article h2 { margin-top: 2.8rem; font-size: clamp(1.55rem, 3vw, 2.2rem); }
.article h3 { margin: 2rem 0 .6rem; color: var(--navy); font-size: 1.15rem; }
.article p, .article li { font-size: 1rem; }
.article ul, .article ol { padding-left: 1.25rem; }
.article li + li { margin-top: .45rem; }
.answer { margin: 0 0 2.5rem; padding: 1.4rem 1.55rem; background: var(--mist); border-left: 6px solid var(--water); font-size: 1.08rem; font-weight: 700; }
.safety-note { margin: 2rem 0; padding: 1.2rem 1.35rem; background: #f7dddd; border-left: 6px solid var(--signal); }
.knowledge-note { margin: 2rem 0; padding: 1.2rem 1.35rem; background: #fff3cf; border-left: 6px solid var(--sand); }
.source-box { margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.source-box h2 { margin: 0 0 .6rem; font-size: 1rem; }
.article-aside { position: sticky; top: 7rem; }
.article-aside h2 { font-size: .75rem; letter-spacing: .14em; text-transform: uppercase; }
.article-aside a { display: block; padding: .55rem 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .84rem; text-decoration: none; }
.article-aside a:hover { color: var(--water); }
.article-cta { margin-top: 1.5rem; padding: 1.25rem; background: var(--navy); color: var(--white); }
.article-cta strong { display: block; margin-bottom: .4rem; }
.article-cta p { color: #c9dcde; font-size: .82rem; }
.article-cta a { display: inline-block; padding: .55rem .7rem; background: var(--signal); color: var(--white); font-size: .72rem; font-weight: 800; text-decoration: none; text-transform: uppercase; }
.related { background: var(--mist); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.related a { padding: 1rem; background: var(--white); color: var(--navy); font-weight: 700; text-decoration: none; border-top: 4px solid var(--water); }
footer { background: var(--deep); color: #bad0d3; }
.footer-inner { max-width: var(--max); margin: auto; padding: 2.8rem 1.25rem 1.5rem; display: grid; grid-template-columns: 1.2fr repeat(2, .8fr); gap: 3rem; }
footer h3 { margin-bottom: .7rem; color: var(--white); font-size: .78rem; text-transform: uppercase; }
footer a { display: block; width: max-content; margin-bottom: .4rem; color: #bad0d3; text-decoration: none; font-size: .84rem; }
footer a:hover { color: var(--white); }
.legal { max-width: var(--max); margin: auto; padding: 1rem 1.25rem 1.5rem; border-top: 1px solid #284657; font-size: .76rem; }
@media (max-width: 850px) {
  .nav-links a:nth-child(3), .nav-links a:nth-child(4) { display: none; }
  .section-head, .article-wrap { grid-template-columns: 1fr; gap: 1rem; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .article-aside { position: static; }
  .paths { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav { min-height: 4.4rem; gap: .6rem; }
  .brand { font-size: 1.05rem; }
  .nav-links { gap: .6rem; }
  .nav-links a:not(.register) { display: none; }
  .nav-links .register { padding: .5rem .55rem; font-size: .65rem; }
  .knowledge-hero { min-height: 32rem; }
  .topic-grid, .related-grid, .footer-inner { grid-template-columns: 1fr; }
  .topic-card { min-height: 16rem; }
  .section { padding-top: 4rem; padding-bottom: 4rem; }
  .article-wrap { padding-top: 3rem; }
  .footer-inner { gap: 1.8rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .topic-card { transition: none; } }