/* =============================================
   Header / Navigation
   ============================================= */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  color: var(--color-white);
  transition: background var(--transition), box-shadow var(--transition), color var(--transition);
}

.site-nav.is-scrolled {
  background: rgba(10, 56, 98, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.12);
}

.site-nav.is-solid {
  background: rgba(10, 56, 98, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.12);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo-img {
  height: var(--logo-festa-height);
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  position: relative;
}

.nav-item.has-dropdown::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 16px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover,
.nav-item.is-open > .nav-link,
.nav-item:focus-within > .nav-link {
  background: rgba(255, 255, 255, 0.12);
}

.nav-link .chevron {
  width: 12px;
  height: 12px;
  transition: transform var(--transition);
}

.nav-item.is-open > .nav-link .chevron,
.nav-item:hover > .nav-link .chevron,
.nav-item:focus-within > .nav-link .chevron {
  transform: rotate(180deg);
}

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  min-width: 180px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-footer-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-dropdown),
              visibility var(--transition-dropdown),
              transform var(--transition-dropdown);
}

.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown,
.nav-item.is-open .dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown a {
  display: block;
  padding: 10px 14px;
  font-size: 0.9rem;
  color: var(--color-primary);
  border-radius: 8px;
  transition: background var(--transition);
}

.dropdown a:hover {
  background: var(--color-overlay);
}

.nav-brand {
  font-family: var(--font-title);
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.nav-brand-img {
  height: var(--logo-soul-height);
  width: auto;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: 8px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Subpage header overlay */
.sub-page .site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: transparent;
}

.sub-page .site-nav.is-scrolled {
  background: rgba(10, 56, 98, 0.72);
}

@media (max-width: 768px) {
  .nav-item.has-dropdown::after {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu-wrap {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 20px 40px;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-dropdown);
    color: var(--color-primary);
  }

  .nav-menu-wrap.is-open {
    transform: translateX(0);
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-item {
    border-bottom: 1px solid var(--color-footer-border);
  }

  .nav-link {
    justify-content: space-between;
    padding: 14px 8px;
  }

  .nav-brand {
    display: none;
  }

  .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0 0 12px 12px;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-dropdown);
  }

  .nav-item.is-open .dropdown {
    max-height: 300px;
  }

  .dropdown a {
    padding: 10px 8px;
    font-size: 0.88rem;
    opacity: 0.85;
  }
}

@media (max-width: 480px) {
  .nav-logo-img {
    height: var(--logo-festa-height-sm);
  }
}