/* Expedition header: brand and booking stay high; section links sit on the hero's tide line. */
.sea-mobile-nav { display: none; }

@media (min-width: 851px) {
  .sea-nav {
    grid-template-columns: minmax(0, 1fr) auto;
    border-bottom: 0;
  }

  .sea-nav .sea-section-nav {
    position: absolute;
    top: calc(100vh - 126px);
    left: 4vw;
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 0;
    color: white;
    background: rgba(5, 30, 40, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.38);
    backdrop-filter: blur(12px);
  }

  .sea-nav .sea-section-nav a {
    display: flex;
    align-items: center;
    min-height: 58px;
    padding: 12px 22px;
    border-right: 1px solid rgba(255, 255, 255, 0.25);
  }

  .sea-nav .sea-section-nav a:last-child { border-right: 0; }
  .sea-nav .sea-section-nav a:hover { color: var(--ink); background: var(--orange); }
}

@media (max-width: 850px) {
  .sea-nav {
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 10px;
  }

  .sea-mobile-nav {
    position: relative;
    display: block;
  }

  .sea-mobile-nav summary {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 10px 12px;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.66);
    font-size: 0.7rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    list-style: none;
    text-transform: uppercase;
    cursor: pointer;
  }

  .sea-mobile-nav summary::-webkit-details-marker { display: none; }

  .sea-mobile-nav > div {
    position: absolute;
    z-index: 30;
    top: calc(100% + 8px);
    right: 0;
    display: grid;
    min-width: 230px;
    padding: 8px;
    color: var(--ink);
    background: var(--foam);
    border: 1px solid var(--ink);
    box-shadow: 10px 12px 0 var(--orange);
  }

  .sea-mobile-nav a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 12px;
    border-bottom: 1px solid #aac2c7;
    font-size: 0.76rem;
    font-weight: 800;
    text-decoration: none;
  }

  .sea-mobile-nav a:last-child { border-bottom: 0; }
}

@media (max-width: 460px) {
  .sea-nav { gap: 7px; }
  .sea-logo strong { font-size: 0.76rem; }
  .nav-book { padding-inline: 9px; }
  .sea-mobile-nav summary { padding-inline: 9px; }
}