.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background var(--duration) var(--ease-standard),
              box-shadow var(--duration) var(--ease-standard);
}

.nav--scrolled {
  background: rgba(18, 20, 24, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo swap: dark logo by default, light on dark backgrounds */
.nav__logo-light { display: none; }
.nav--over-dark .nav__logo-dark { display: none; }
.nav--over-dark .nav__logo-light { display: block; }

/* Links: inherit body color by default, white on dark */
.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  opacity: 0.7;
  transition: opacity 0.2s, color 0.2s;
}

.nav__link:hover,
.nav__link[aria-current="page"] { opacity: 1; }

.nav--over-dark .nav__link { color: var(--white); }

.nav__toggle { display: none; }

.nav__mobile {
  display: none;
  flex-direction: column;
  padding: 16px var(--space-md) 24px;
  background: var(--black);
}

.nav__mobile--open { display: flex; }
.nav__mobile-link {
  padding: 12px 0;
  color: var(--white);
  font-size: 1.125rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px 0;
  }
  .nav__toggle span {
    display: block;
    height: 2px;
    background: var(--black);
    border-radius: 2px;
    transition: 0.2s;
  }
  .nav--over-dark .nav__toggle span { background: var(--white); }
}

.btn--sm { padding: 10px 24px; font-size: 0.875rem; }