/* ==========================================================================
   Header / Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: transparent;
  border-bottom: 2px solid transparent;
  /* No backdrop-filter at rest — the hero shows through cleanly. */
  transition: border-color var(--t-base) var(--ease-out),
              background-color var(--t-base) var(--ease-out),
              backdrop-filter var(--t-base) var(--ease-out),
              -webkit-backdrop-filter var(--t-base) var(--ease-out);
}

.site-header.is-scrolled {
  background-color: rgba(255, 249, 229, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom-color: var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-md);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--color-brown);
  transition: transform var(--t-fast) var(--ease-spring);
}

.nav__brand:hover { transform: rotate(-2deg) scale(1.02); }

.nav__brand-logo {
  display: block;
  height: 36px;
  width: auto;
  max-width: 160px;
  flex-shrink: 0;
}

@media (min-width: 600px) {
  .nav__brand-logo {
    height: 40px;
    max-width: 180px;
  }
}

.nav__menu {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  font-size: 1rem;
  color: var(--color-brown);
  text-decoration: none;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: var(--radius-pill);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-base) var(--ease-spring);
}

.nav__link:hover::after,
.nav__link:focus-visible::after,
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ----------------------------------------------------------------------
   Language switcher
   ---------------------------------------------------------------------- */

.lang-switcher {
  position: relative;
}

.lang-switcher__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  font-size: 0.9375rem;
  color: var(--color-brown);
  background-color: var(--color-paper);
  border: var(--border-thin);
  border-radius: var(--radius-pill);
  padding: 0.5rem 0.875rem;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease-spring),
              box-shadow var(--t-fast) var(--ease-spring);
}

.lang-switcher__toggle:hover {
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-xs);
}

.lang-switcher__flag {
  font-size: 1.1em;
  line-height: 1;
}

.lang-switcher__chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--t-fast) var(--ease-out);
}

.lang-switcher.is-open .lang-switcher__chevron { transform: rotate(180deg); }

.lang-switcher__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 11rem;
  background-color: var(--color-paper);
  border: var(--border-base);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-xs);
  display: none;
  z-index: var(--z-overlay);
}

.lang-switcher.is-open .lang-switcher__menu { display: block; }

.lang-switcher__option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  font-size: 0.9375rem;
  color: var(--color-brown);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  text-align: left;
  text-decoration: none;
  transition: background-color var(--t-fast);
}

.lang-switcher__option:hover,
.lang-switcher__option:focus-visible { background-color: var(--color-cream); }

.lang-switcher__option[aria-current="true"] {
  background-color: var(--color-primary);
}

/* ----------------------------------------------------------------------
   Mobile menu
   ---------------------------------------------------------------------- */

.nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background-color: var(--color-paper);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--t-fast);
}

.nav__toggle:hover { transform: scale(1.05); }

.nav__toggle-line {
  display: block;
  width: 18px;
  height: 2.5px;
  background-color: var(--color-brown);
  border-radius: var(--radius-pill);
  position: relative;
  transition: transform var(--t-base) var(--ease-out);
}

.nav__toggle-line::before,
.nav__toggle-line::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2.5px;
  background-color: var(--color-brown);
  border-radius: var(--radius-pill);
  transition: transform var(--t-base) var(--ease-out),
              top var(--t-base) var(--ease-out);
}

.nav__toggle-line::before { top: -7px; }
.nav__toggle-line::after  { top: 7px; }

.nav__toggle[aria-expanded="true"] .nav__toggle-line { background-color: transparent; }
.nav__toggle[aria-expanded="true"] .nav__toggle-line::before { top: 0; transform: rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__toggle-line::after  { top: 0; transform: rotate(-45deg); }

.nav__mobile {
  position: fixed;
  inset: 0;
  background-color: var(--color-cream);
  padding: 5rem var(--gutter) var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  transform: translateX(100%);
  transition: transform var(--t-slow) var(--ease-out);
  z-index: calc(var(--z-sticky) - 1);
  overflow-y: auto;
}

.nav__mobile.is-open { transform: translateX(0); }

.nav__mobile .nav__link {
  font-size: 1.5rem;
  padding: var(--space-md) 0;
  border-bottom: 2px dashed var(--color-brown-muted);
}

/* True phones (<600px): the inline Download CTA can't fit alongside brand +
   lang + hamburger. The mobile drawer already contains it, so hide it here.
   On tablets (600–899) we still show it — there's room and it avoids forcing
   users into the drawer just to see the primary action. */
@media (max-width: 599px) {
  .nav__cta { display: none; }
}

/* Tiny phones: trim the lang switcher to just the flag + chevron. */
@media (max-width: 419px) {
  .lang-switcher__toggle [data-lang-label] { display: none; }
  .lang-switcher__toggle { padding: 0.5rem 0.55rem; }
}

@media (min-width: 900px) {
  .nav__menu { display: flex; }
  .nav__toggle { display: none; }
  .nav__mobile { display: none; }
}