/* ADDITIVE NAVIGATION */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 9000;
  background: var(--paper);
  border-bottom: 1px solid var(--line-soft);
}
.site-nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  max-width: 1600px;
  margin: 0 auto;
}
.site-nav__brand {
  font-family: var(--serif);
  font-size: var(--fz-h3);
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.site-nav__menu {
  display: flex;
  gap: 1.5rem;
}
.site-nav__link {
  text-decoration: none;
  color: var(--muted);
  font-family: var(--sans);
  font-size: var(--fz-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem;
  transition: color 0.2s;
}
.site-nav__link[aria-current="page"] {
  color: var(--ink);
}
.site-nav__link:hover {
  color: var(--accent);
}
.site-nav__link:focus-visible, .site-nav__brand:focus-visible, .site-nav__toggle:focus-visible, .site-footer__link:focus-visible, .site-footer__contact a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.site-nav__toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  align-items: center;
  justify-content: center;
}
.site-nav__toggle-icon, .site-nav__toggle-icon::before, .site-nav__toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: transform 0.3s;
}
.site-nav__toggle-icon::before, .site-nav__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}
.site-nav__toggle-icon::before { top: -7px; }
.site-nav__toggle-icon::after { bottom: -7px; }

@media (prefers-reduced-motion: reduce) {
  .site-nav__toggle-icon, .site-nav__toggle-icon::before, .site-nav__toggle-icon::after,
  .site-nav__menu, .site-nav__link {
    transition: none !important;
  }
}

@media (max-width: 900px) {
  .site-nav__toggle {
    display: flex;
  }
  .site-nav__menu {
    position: fixed;
    top: 66px; /* approx nav height */
    left: 0;
    width: 100%;
    height: calc(100vh - 66px);
    background: var(--paper);
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 1.5rem;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0.3s;
    overflow-y: auto;
  }
  .site-nav__menu.is-open {
    transform: translateX(0);
    visibility: visible;
  }
  .site-nav__link {
    font-size: var(--fz-lead);
    padding: 1rem 0;
    min-height: 44px;
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-icon {
    background: transparent;
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-icon::before {
    transform: translateY(7px) rotate(45deg);
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-icon::after {
    transform: translateY(-7px) rotate(-45deg);
  }
}

.site-footer {
  background: var(--paper-2);
  padding: 4rem 1.5rem;
  margin-top: 4rem;
  border-top: 1px solid var(--line-soft);
}
.site-footer__inner {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 3rem;
}
.site-footer__nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.site-footer__link {
  text-decoration: none;
  color: var(--muted);
  font-family: var(--sans);
  font-size: var(--fz-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color 0.2s;
}
.site-footer__link:hover {
  color: var(--accent);
}
.site-footer__contact p {
  margin: 0 0 0.5rem 0;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: var(--fz-body);
}
.site-footer__contact a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}
.site-footer__contact a:hover {
  color: var(--accent);
}