:root {
  --whoi-navy: #002b49;
  --whoi-blue: #00507a;
  --text: #1c1c1c;
  --muted: #5a5a5a;
  --border: #e2e2e2;
  --bg: #ffffff;
  --bg-alt: #f5f7f8;
  --max-width: 860px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--whoi-blue);
}

/* Header */
.site-header {
  position: relative;
  background: var(--whoi-navy);
  color: #fff;
  padding: 2rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem 1.5rem;
  flex-wrap: wrap;
}

/* The banner logos sit on white plates: the WHOI and Schmidt wordmarks are
   both dark-on-transparent and would vanish against the navy. */
.logo {
  height: 48px;
  width: auto;
  background: #fff;
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
}

/* Funder logos get their own row so the title keeps the full 860px to itself. */
.header-funders {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.funder-label {
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: #b7cbd8;
  margin-right: 0.15rem;
}

/* A fixed plate height keeps the two marks looking even despite very
   different aspect ratios (Schmidt is a wide wordmark, ONR a round seal). */
.logo-plate {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 54px;
  padding: 0 0.75rem;
  background: #fff;
  border-radius: 4px;
}

.logo-plate img {
  height: auto;
  max-height: 38px;
  width: auto;
}

@media (max-width: 640px) {
  /* Give the label its own line so both plates stay on one row */
  .header-funders {
    justify-content: flex-start;
    margin-top: 1.25rem;
  }
  .funder-label {
    flex: 1 0 100%;
    margin: 0 0 0.1rem;
  }
}

.eyebrow {
  margin: 0 0 0.25rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #b7cbd8;
}

.header-text h1 {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.3;
}

.dates {
  margin: 0.4rem 0 0;
  color: #d7e4ec;
}

/* Nav */
.site-nav {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

.site-nav .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.site-nav a {
  color: var(--whoi-navy);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-nav a:hover {
  text-decoration: underline;
}

/* Main sections */
main {
  padding: 2.5rem 1.5rem 1rem;
}

section {
  margin-bottom: 2.75rem;
  scroll-margin-top: 4rem;
}

h2 {
  color: var(--whoi-navy);
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.4rem;
  font-size: 1.3rem;
}

h3 {
  margin-top: 0;
  color: var(--whoi-navy);
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin: 1rem 0;
}

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
}

.card h3 {
  font-size: 1rem;
  margin-bottom: 0.15rem;
}

.card-dates {
  font-weight: 600;
  color: var(--whoi-blue);
  margin: 0 0 0.4rem;
  font-size: 0.9rem;
}

.card p:last-child {
  font-size: 0.9rem;
  margin-bottom: 0;
}

@media (max-width: 640px) {
  .cards {
    grid-template-columns: 1fr;
  }
}

/* Theme list */
.theme-list {
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.2rem;
}

@media (max-width: 640px) {
  .theme-list { columns: 1; }
}

/* Button */
.button {
  display: inline-block;
  background: var(--whoi-navy);
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.button:hover {
  background: var(--whoi-blue);
}

/* Secondary note, e.g. the foreign-visitor step under Registration */
.note {
  background: var(--bg-alt);
  border-left: 3px solid var(--whoi-blue);
  border-radius: 0 4px 4px 0;
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
  margin-top: 1.25rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Funder logos */
.funder-logos {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-top: 1.5rem;
}

.funder-logo {
  display: inline-flex;
  align-items: center;
}

.funder-logo img {
  height: 68px;
  width: auto;
  max-width: 100%;
}

/* The Schmidt wordmark is wide and light while the ONR seal is a dense round mark,
   so they need different heights to carry the same visual weight. */
.funder-logo img[src$=".svg"] {
  height: 46px;
}

@media (max-width: 640px) {
  .funder-logos { gap: 1.75rem; }
}

/* On wide screens the 860px content column leaves real empty margin either
   side of the banner, so the funder logos move out there and flank the title
   instead of taking up a row of their own. Below 1200px the margins are too
   narrow to hold a plate without colliding with the title, so the stacked
   row above is used instead. */
@media (min-width: 1240px) {
  .header-funders {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    /* Wide enough to sit just outside the 860px content column, rather than
       pinned to the viewport edges where it would drift far from the title. */
    width: min(1180px, 100% - 2rem);
    max-width: none;
    margin: 0;
    padding: 0;
    /* Both funder marks stack together in the right margin, leaving the left
       margin clear so the WHOI logo still reads as the host. */
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    flex-wrap: nowrap;
    gap: 0.5rem;
    pointer-events: none;
  }

  /* "Supported by" has no room to read cleanly out in the margin; the
     Funders section below carries the acknowledgment in words. */
  .header-funders .funder-label {
    display: none;
  }

  /* Equal widths keep the vertical stack a tidy block instead of a ragged edge */
  .header-funders .logo-plate {
    min-width: 148px;
    pointer-events: auto;
  }
}