/* ==========================================================================
   Layout — header, footer, nav, grid utilities
   ========================================================================== */

/* ---- Header / nav ---- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 4.5rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text-primary);
}

.primary-nav {
  display: none;
}

.primary-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 2rem;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.primary-nav__list a:hover {
  color: var(--text-primary);
}

.site-header__cta {
  display: none;
}

.mobile-nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2.25rem;
  height: 2.25rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  cursor: pointer;
}

.mobile-nav-toggle__bar {
  display: block;
  width: 1.125rem;
  height: 2px;
  margin: 0 auto;
  background: var(--text-primary);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-nav-toggle.is-open .mobile-nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.mobile-nav-toggle.is-open .mobile-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.mobile-nav-toggle.is-open .mobile-nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  border-top: 1px solid var(--line);
  background: var(--ink);
  padding: 1.5rem 1rem 2rem;
}

.mobile-nav__list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: 1.0625rem;
}

@media (min-width: 1024px) {
  .primary-nav {
    display: block;
  }
  .site-header__cta {
    display: inline-flex;
  }
  .mobile-nav-toggle {
    display: none;
  }
  .mobile-nav {
    display: none;
  }
}

main#main-content {
  padding-top: 4.5rem; /* offset for fixed header */
}

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

.site-footer {
  border-top: 1px solid var(--line);
  padding-top: 4rem;
}

.site-footer__inner {
  display: grid;
  gap: 3rem;
  grid-template-columns: 1fr;
}

.site-footer__brand p {
  max-width: 28rem;
  margin-top: 1rem;
}

.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  color: var(--text-secondary);
}

.site-footer__list a:hover {
  color: var(--text-primary);
}

.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer__contact a {
  color: var(--text-primary);
  font-weight: 500;
}

.site-footer__bottom {
  margin-top: 3rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  border-top: 1px solid var(--line);
}

@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

/* ---- Generic grid utilities used across page templates ---- */

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.two-col {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 1024px) {
  .two-col {
    grid-template-columns: 7fr 5fr;
    gap: 4rem;
  }
  .two-col--reverse {
    grid-template-columns: 5fr 7fr;
  }
  .two-col--reverse > :first-child {
    order: 2;
  }
}