/* ─── NAV BASE ────────────────────────────────────────────────────────────── */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--trans-normal);
}

.site-nav.is-scrolled {
  border-bottom-color: var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  max-width: none;
  margin-inline: auto;
  padding-inline: 80px;
  transition: height var(--trans-normal);
}

.site-nav.is-scrolled .nav-inner {
  height: var(--nav-height-small);
}

/* ─── WORDMARK ────────────────────────────────────────────────────────────── */

.nav-wordmark {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 300;
  font-style: italic;
  letter-spacing: -0.01em;
  line-height: 1;
  position: relative;
  display: inline-block;
}

.nav-logo {
  height: 44px;
  width: auto;
  display: block;
}

/* ─── DESKTOP LINKS ───────────────────────────────────────────────────────── */

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  position: relative;
  display: inline-block;
  padding: 2px 4px;
  color: var(--color-muted);
  transition: color var(--trans-fast);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-ink);
}

/* ─── HAMBURGER ───────────────────────────────────────────────────────────── */

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-ink);
  transition: transform var(--trans-normal), opacity var(--trans-normal);
}

/* ─── MOBILE FULL-SCREEN OVERLAY ─────────────────────────────────────────── */

.nav-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--color-bg);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.nav-overlay.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav-overlay-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  font-size: 1.5rem;
  color: var(--color-muted);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--trans-fast);
}

.nav-overlay-close:hover {
  color: var(--color-ink);
}

.nav-overlay-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.nav-overlay-link {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  transition: color var(--trans-fast);
}

.nav-overlay-link:hover {
  color: var(--color-accent);
}

/* ─── RESPONSIVE ──────────────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .nav-links     { display: none; }
  .nav-hamburger { display: flex; }

  .nav-inner {
    padding-inline: 1.25rem;
    height: 64px;
  }

  .site-nav.is-scrolled .nav-inner {
    height: 56px;
  }
}