/**
 * Nawigacja: header sticky, dropdown wielopoziomowy, menu mobilne.
 */
.header {
  width: 100%;
  background-color: var(--color-bg-header);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background-color var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard),
    padding var(--duration-base) var(--ease-standard);
}

.header.is-scrolled {
  background-color: var(--color-bg-header-scrolled);
  border-bottom-color: var(--color-border);
}

.header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-md);
  transition: padding var(--duration-base) var(--ease-standard);
}

.header.is-scrolled .header__bar {
  padding-block: var(--space-xs);
}

.header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo-image {
  display: block;
  width: auto;
  height: 58px;
  margin-block: -12px;
  object-fit: contain;
}

/* Nawigacja desktop */
.nav-desktop {
  display: none;
}

@media (min-width: 960px) {
  .nav-desktop {
    display: block;
  }
}

.nav-desktop__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-desktop__item {
  /* Dropdown jest pozycjonowany względem pełnej szerokości sticky headera,
     a nie względem pojedynczego linku nawigacji. */
  position: static;
}

.nav-desktop__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3xs);
  padding: var(--space-2xs) 0;
  font-size: var(--fs-sm);
  letter-spacing: 0.02em;
  color: var(--color-text);
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}

.nav-desktop__link:hover,
.nav-desktop__link:focus-visible,
.nav-desktop__link.is-active {
  color: var(--color-accent-strong);
  border-bottom-color: var(--color-accent);
}

.nav-desktop__caret {
  width: 9px;
  height: 9px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--duration-fast) var(--ease-standard);
  margin-top: -3px;
}

.nav-desktop__item.is-open .nav-desktop__caret {
  transform: rotate(-135deg);
  margin-top: 3px;
}

/*
 * Dropdown jest umyślnie osadzony BEZ przerwy (top: 100%, flush) względem
 * przycisku-triggera. Wcześniejsza wersja miała `top: calc(100% + gap)`,
 * co tworzyło "martwą strefę" bez żadnego elementu pod kursorem - w tej
 * strefie mysz opuszczała hoverowalny obszar <li>, więc mouseleave
 * zamykał menu, zanim użytkownik zdążył wjechać w panel ("uciekające"
 * menu). Wizualny oddech zapewnia wewnętrzny padding-top panelu, a nie
 * przerwa w pozycjonowaniu - dzięki temu obszar trigger + panel jest
 * jednym ciągłym, hoverowalnym regionem.
 */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  width: min(1080px, calc(100vw - 32px));
  max-width: calc(100vw - 32px);
  min-width: 0;
  max-height: var(--dropdown-max-height, calc(100vh - 120px));
  box-sizing: border-box;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  padding: calc(var(--space-md) + 6px) var(--space-md) var(--space-md);
  margin-top: var(--space-sm);
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  align-items: start;
  gap: var(--space-md);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard), visibility var(--duration-fast);
  z-index: var(--z-dropdown);
}

@media (min-width: 1280px) {
  .nav-dropdown {
    grid-template-columns: repeat(5, minmax(160px, 1fr));
  }
}

/* Pasek-most: niewidzialny, ale w pełni hoverowalny, wypełnia dokładnie
   przestrzeń wizualnego marginesu (margin-top) między triggerem a
   panelem, więc kursor nigdy nie opuszcza hoverowalnego obszaru. */
.nav-dropdown::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: calc(var(--space-sm) * -1);
  height: var(--space-sm);
}

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

.nav-dropdown__region {
  min-width: 0;
}

.nav-dropdown__region h3 {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
  font-family: var(--font-sans);
}

.nav-dropdown__region a {
  display: block;
  padding: var(--space-3xs) 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-standard);
}

.nav-dropdown__region a:hover,
.nav-dropdown__region a:focus-visible {
  color: var(--color-accent-strong);
}

.nav-dropdown__region a.nav-dropdown__region-link {
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: var(--fs-base);
  margin-bottom: var(--space-3xs);
}

/* Hamburger */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-items: center;
}

@media (min-width: 960px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--duration-fast) var(--ease-standard), opacity var(--duration-fast) var(--ease-standard);
}

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

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

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

/* Menu mobilne */
.nav-mobile {
  position: fixed;
  inset: 0;
  z-index: var(--z-mobile-menu);
  background-color: var(--color-bg);
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-out);
  overflow-y: auto;
  visibility: hidden;
}

.nav-mobile.is-open {
  transform: translateX(0);
  visibility: visible;
}

@media (min-width: 960px) {
  .nav-mobile {
    display: none;
  }
}

.nav-mobile__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--container-padding);
  border-bottom: 1px solid var(--color-border);
}

.nav-mobile__close {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-lg);
  color: var(--color-text);
}

.nav-mobile__list {
  padding: var(--space-md) var(--container-padding) var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.nav-mobile__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.nav-mobile__link:hover,
.nav-mobile__link:focus-visible {
  color: var(--color-accent-strong);
}

.nav-mobile__accordion-toggle {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-mobile__accordion-toggle::before,
.nav-mobile__accordion-toggle::after {
  content: "";
  position: absolute;
}

.nav-mobile__plus {
  position: relative;
  width: 14px;
  height: 14px;
}

.nav-mobile__plus::before,
.nav-mobile__plus::after {
  content: "";
  position: absolute;
  background-color: var(--color-accent-strong);
  transition: transform var(--duration-fast) var(--ease-standard);
}

.nav-mobile__plus::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 1.5px;
  transform: translateY(-50%);
}

.nav-mobile__plus::after {
  left: 50%;
  top: 0;
  width: 1.5px;
  height: 100%;
  transform: translateX(-50%);
}

.nav-mobile__item.is-open .nav-mobile__plus::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.nav-mobile__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-standard);
}

.nav-mobile__item.is-open .nav-mobile__panel {
  max-height: 1800px;
}

.nav-mobile__sub {
  padding-left: var(--space-sm);
  padding-bottom: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.nav-mobile__sub-group-label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-top: var(--space-sm);
}

.nav-mobile__sub a {
  padding: var(--space-2xs) 0;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: var(--fs-md);
}

.nav-mobile__sub a:hover,
.nav-mobile__sub a:focus-visible {
  color: var(--color-accent-strong);
}

.nav-mobile__social {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md) var(--container-padding) var(--space-xl);
  border-top: 1px solid var(--color-border);
}