/* ---- Site Nav ---- */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--sp-4);
  padding-inline: var(--gutter);
  /* Blur alone doesn't darken, so links washed out over bright hero
     footage. The tint is invisible against --bg on inner pages but
     guarantees legibility over any hero visual. */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 10, 10, 0.55);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.site-nav.scrolled {
  border-color: var(--border);
  background: rgba(10, 10, 10, 0.85);
}

/* ---- Wordmark ---- */

.site-nav__brand {
  font-family: var(--mono);
  font-size: var(--text-s);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg);
}

/* ---- Links ---- */

.site-nav__links {
  display: flex;
  gap: var(--sp-8);
  align-items: center;
}

.site-nav__links a {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] {
  color: var(--fg);
}

/* ---- Hamburger ---- */

.site-nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
}

.site-nav__toggle span {
  display: block;
  height: 1px;
  background: var(--fg);
  transition: transform var(--dur) var(--ease),
              opacity var(--dur) var(--ease);
}

/* ---- Mobile overlay ---- */

.site-nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 99;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-inline: var(--gutter);
  gap: var(--sp-6);
}

.site-nav__mobile a {
  font-size: var(--text-l);
  letter-spacing: -0.02em;
  color: var(--fg);
  transition: color var(--dur) var(--ease);
}

.site-nav__mobile a:hover {
  color: var(--muted);
}

/* ---- Mobile breakpoint ---- */

@media (max-width: 768px) {
  .site-nav__links {
    display: none;
  }

  .site-nav__toggle {
    display: flex;
  }

  body.nav-open .site-nav__mobile {
    display: flex;
  }

  body.nav-open .site-nav__toggle span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  body.nav-open .site-nav__toggle span:nth-child(2) {
    opacity: 0;
  }

  body.nav-open .site-nav__toggle span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}