/* =============================================
   NAV.CSS — Header & Navigation
   Fabbro Metalli Roma
   ============================================= */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background var(--dur-mid) ease,
              border-color var(--dur-mid) ease;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(20, 20, 18, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--clr-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
}

/* ─── Logo ────────────────────────────────────── */
.nav-logo {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  text-decoration: none;
}

.nav-logo__name {
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--clr-text);
}

.nav-logo__sub {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--clr-accent);
}

/* ─── Nav links ───────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-links a {
  position: relative;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  transition: color var(--dur-fast) ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--clr-accent);
  transition: width var(--dur-mid) var(--ease-out);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--clr-text);
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  width: 100%;
}

/* ─── CTA nav ─────────────────────────────────── */
.nav-cta {
  padding: 0.55rem 1.4rem;
  font-size: 0.75rem;
}

/* ─── Mobile toggle ───────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--clr-text);
  transform-origin: center;
  transition: transform var(--dur-fast) ease, opacity var(--dur-fast) ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ─── Mobile menu ─────────────────────────────── */
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--clr-bg);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-mid) ease;
}

.nav-mobile.open {
  display: flex;
  opacity: 1;
  pointer-events: auto;
}

.nav-mobile a {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  letter-spacing: 0.05em;
  color: var(--clr-text);
  transition: color var(--dur-fast) ease;
}

.nav-mobile a:hover {
  color: var(--clr-accent);
}

/* ─── Responsive ──────────────────────────────── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
    z-index: 101;
  }
}