/* ============================================================
   NAV — Smile Studio
   ============================================================ */

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--black);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  z-index: 999;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

/* ── Header ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: transparent;
  padding: 2rem var(--gutter);
  color: var(--white);
  transition:
    background var(--duration-base) var(--ease),
    padding var(--duration-base) var(--ease),
    color var(--duration-base) var(--ease);
}

.nav.scrolled {
  background: var(--white);
  padding: 1.25rem var(--gutter);
  box-shadow: 0 1px 0 var(--gray-200);
  color: var(--black);
}

/* ── Inner ── */
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin: 0 auto;
}

/* ── Logo ── */
.nav__logo img {
  display: block;
  filter: brightness(0) invert(1);
  transition: filter var(--duration-base) var(--ease);
}
.nav.scrolled .nav__logo img {
  filter: none;
}

/* ── Desktop links ── */
.nav__links {
  display: flex;
  align-items: center;
  gap: 3rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.nav__link {
  color: inherit;
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  padding: 0;
  transition: opacity var(--duration-fast) var(--ease);
}
.nav__link:hover,
.nav__link:focus-visible {
  opacity: 0.6;
  outline: none;
}
.nav__link.active {
  opacity: 0.5;
}

/* ── CTA ── */
.nav__cta {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  transition: opacity var(--duration-fast) var(--ease);
  white-space: nowrap;
}
.nav__cta:hover { opacity: 0.6; }

/* ── Dropdown ── */
.nav__dropdown {
  position: relative;
}

.nav__link--dropdown {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 1rem);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--white);
  color: var(--black);
  padding: 1rem;
  min-width: 220px;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 250ms var(--ease),
    transform 250ms var(--ease);
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown:focus-within .nav__dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-item {
  display: block;
  padding: 0.6rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--black);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease);
  white-space: nowrap;
}
.nav__dropdown-item:hover { opacity: 0.5; }

/* ── Hamburger ── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 101;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  transition:
    transform var(--duration-fast) var(--ease),
    opacity var(--duration-fast) var(--ease);
  transform-origin: center;
}

/* X state */
.nav__hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ── Mobile menu ── */
.nav__mobile {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--white);
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease);
}
.nav__mobile.open {
  opacity: 1;
  pointer-events: auto;
}

.nav__mobile nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.nav__mobile a {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--black);
  text-decoration: none;
  letter-spacing: var(--tracking-wide);
  transition: opacity var(--duration-fast) var(--ease);
}
.nav__mobile a:hover { opacity: 0.5; }

.nav__mobile-cta {
  font-size: 0.8rem !important;
  font-weight: 400 !important;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider) !important;
  border-bottom: 1px solid var(--black);
  padding-bottom: 2px;
  margin-top: 0.5rem;
}

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

  .nav__hamburger {
    display: flex;
  }
}