/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 7, 20, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.1rem;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.wordmark span {
  background: linear-gradient(120deg, var(--color-purple), var(--color-blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle__icon,
.nav-toggle__icon::before,
.nav-toggle__icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__icon::before {
  top: -6px;
}

.nav-toggle__icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.nav-links a {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-text);
  border-bottom-color: var(--color-purple);
}

.nav-links a[aria-current="true"] {
  color: var(--color-text);
  border-bottom-color: var(--color-blue);
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(9, 7, 20, 0.97);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem var(--gutter) 1.25rem;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-med), opacity var(--transition-med);
  }

  .nav-links[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding-block: 0.85rem;
    border-bottom: 1px solid var(--color-border);
  }
}

/* ---------- Hero ---------- */

.hero {
  min-height: min(92vh, 820px);
  display: flex;
  align-items: center;
  padding-block: clamp(5rem, 14vw, 8rem);
}

.hero__content {
  max-width: 760px;
}

.hero h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.6rem);
  margin-bottom: 0.6em;
}

.hero__subhead {
  font-family: var(--font-body);
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: 2.25rem;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ---------- Research Focus grid ---------- */

.research-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .research-grid {
    /* Fixed 2-column grid (not auto-fit) so the 4 Laboratory feature cards
       always form a deliberate 2x2 composition rather than reflowing to
       3+1. gap is a single value, so row and column spacing stay identical
       by construction. grid-auto-rows: 1fr forces both rows to share the
       same height, so all 4 cards are identical even if copy length ever
       drifts between them. */
    grid-template-columns: repeat(2, minmax(280px, 1fr));
    grid-auto-rows: 1fr;
    gap: 2rem;
  }
}

/* ---------- Program grid (Outer Minds / Inner Minds) ---------- */

.program-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

/* ---------- Equipment grid (Outer Minds / Inner Minds cards) ---------- */

.equipment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 640px) {
  .equipment-grid {
    /* Fixed 2-column grid, exactly one card per division. Grid's default
       align-items: stretch already makes both cards match the taller one's
       height with content top-aligned, so no extra rules are needed to
       handle the two lists' differing lengths. */
    grid-template-columns: repeat(2, minmax(280px, 1fr));
  }
}

/* ---------- Team grid ---------- */

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

/* ---------- Org list (Research alignment pills, part of Mission below) ---------- */

.org-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- Mission ---------- */

.mission {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

.mission__body {
  max-width: 68ch;
  color: var(--color-text-muted);
  font-size: 1.08rem;
}

@media (min-width: 860px) {
  .mission {
    grid-template-columns: minmax(220px, 320px) 1fr;
    align-items: start;
  }
}

/* Research alignment now reads as a continuation of Mission (not its own
   section) — noticeably less top spacing than a full section break
   (.section's own padding-block), but still enough to be scannable as its
   own sub-block. Its heading + description reuse the .mission /
   .mission__body classes directly (rather than duplicating similar-but-
   different rules), so it renders in the exact same two-column grid, at the
   same column widths, as "Why we're asking these questions" above it. The
   org-list tag row sits below that grid, spanning the section's full width. */
.mission-alignment {
  margin-top: clamp(2.5rem, 6vw, 3.5rem);
}

.mission-alignment h3 {
  font-size: 1.3rem;
}

.mission-alignment .org-list {
  margin-top: 1.75rem;
}

/* ---------- Events ---------- */

.events-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
}

@media (min-width: 860px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer p {
  margin: 0;
  color: var(--color-text-faint);
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}