/* ============================================================
   ESTETICA CRISTINA — Navbar
   Logo tipografico (Italiana), link con underline animata al
   hover, header trasparente sull'hero.
   ============================================================ */

.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 900;
  background-color: transparent;
  transition: background-color var(--t-base), backdrop-filter var(--t-base);
}
.site-header.is-scrolled {
  background-color: rgba(27, 22, 19, 0.55);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--header-h);
}

.logo {
  grid-column: 1;
  justify-self: start;
  display: inline-flex;
  align-items: center;
}
.logo__img {
  height: 34px;
  width: auto;
}

.main-nav { grid-column: 2; }
.main-nav__list { display: flex; gap: var(--sp-lg); }

.main-nav__link {
  position: relative;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-light);
  padding-block: 0.4rem;
  transition: color var(--t-fast);
}
.main-nav__link::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  bottom: -2px;
  height: 1px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-out);
}
.main-nav__link:hover::after,
.main-nav__link.is-active::after { transform: scaleX(1); }

.header-cta {
  grid-column: 3;
  justify-self: end;
  color: var(--text-light);
  border-color: currentColor;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 950;
  grid-column: 3;
  justify-self: end;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 26px;
  height: 20px;
}
.nav-toggle__bar {
  display: block;
  height: 1px;
  width: 100%;
  background-color: var(--text-light);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 899;
  background-color: var(--bg-dark);
  padding: calc(var(--header-h) + var(--sp-lg)) var(--pad-x) var(--sp-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--t-base), transform var(--t-base), visibility var(--t-base);
}
.mobile-nav[data-state="open"] { opacity: 1; visibility: visible; transform: translateY(0); }
.mobile-nav__list { display: flex; flex-direction: column; gap: var(--sp-md); margin-bottom: var(--sp-lg); }
.mobile-nav__link {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--text-light);
}
body.nav-open { overflow: hidden; }

@media (max-width: 860px) {
  .main-nav, .header-cta { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav { display: block; }
}