.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav--transparent {
  background: transparent;
}

.site-nav--solid {
  background: var(--color-white);
  box-shadow: 0 1px 0 var(--color-light-gray);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-nav--transparent .nav-brand {
  color: var(--color-white);
}

.site-nav--solid .nav-brand {
  color: var(--color-navy);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.15s ease;
  letter-spacing: 0.02em;
}

.site-nav--transparent .nav-links a {
  color: var(--color-white);
}

.site-nav--transparent .nav-links a:hover {
  color: var(--color-gold);
}

.site-nav--solid .nav-links a {
  color: var(--color-navy);
}

.site-nav--solid .nav-links a:hover {
  color: var(--color-red);
}

.nav-donate {
  background: var(--color-red);
  color: var(--color-white) !important;
  padding: 0.5rem 1.25rem;
  border-radius: 4px;
  transition: background-color 0.15s ease !important;
}

.nav-donate:hover {
  background: var(--color-red-hover);
  color: var(--color-white) !important;
}

/* Hamburger */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 110;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  transition: all 0.3s ease;
}

.site-nav--transparent .nav-hamburger span {
  background: var(--color-white);
}

.site-nav--solid .nav-hamburger span {
  background: var(--color-navy);
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-navy);
  z-index: 105;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-white);
  text-decoration: none;
  transition: color 0.15s ease;
}

.mobile-menu a:hover {
  color: var(--color-gold);
}

.mobile-menu .nav-donate {
  font-size: var(--text-xl);
  padding: 0.75rem 2rem;
  margin-top: 1rem;
}

@media (max-width: 768px) {
  .site-nav {
    height: var(--nav-height-mobile);
  }

  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: block;
  }

  .nav-brand {
    font-size: var(--text-lg);
  }

  /* Keep donate visible on mobile header */
  .nav-mobile-donate {
    display: inline-block;
    background: var(--color-red);
    color: var(--color-white);
    padding: 0.4rem 1rem;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    margin-right: 0.5rem;
    transition: background-color 0.15s ease;
  }

  .nav-mobile-donate:hover {
    background: var(--color-red-hover);
    color: var(--color-white);
  }
}

@media (min-width: 769px) {
  .nav-mobile-donate {
    display: none;
  }
}