/**
 * header.css — Akademia Naturalnego Życia
 * Sticky header, dropdown nav, hamburger responsive.
 *
 * @package Akademia
 */

/* ── Base header ───────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-primary);
  box-shadow: 0 2px 12px rgba(0,0,0,.15);
  transition: box-shadow var(--duration-base) var(--ease-out);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 72px;
  gap: var(--space-8);
}

/* ── Logo ──────────────────────────────────────────── */
.site-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.site-logo__img {
  height: 52px;
  width: auto;
}

/* ── Primary nav ───────────────────────────────────── */
.primary-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav__item {
  position: relative;
}

.primary-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wide);
  color: var(--color-surface);
  text-transform: uppercase;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out);
}

.primary-nav__link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  width: 60%;
  height: 2px;
  background-color: #ffffff;
  border-radius: var(--radius-full);
  transition: transform var(--duration-base) var(--ease-out);
}

.primary-nav__link:hover::after,
.primary-nav__item.current-menu-item > .primary-nav__link::after,
.primary-nav__item.current-menu-ancestor > .primary-nav__link::after {
  transform: translateX(-50%) scaleX(1);
}

/* ── Dropdown arrow ────────────────────────────────── */
.nav-arrow {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
  margin-left: var(--space-1);
}

.primary-nav__item:hover > .primary-nav__link .nav-arrow {
  transform: rotate(-135deg) translateY(0);
}

/* ── Dropdown submenu ──────────────────────────────── */
.primary-nav__item > ul {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 220px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out),
    visibility var(--duration-base);
}

.primary-nav__item:hover > ul,
.primary-nav__item:focus-within > ul {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.primary-nav__item > ul li a {
  display: block;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: var(--font-normal);
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.primary-nav__item > ul li a:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

/* ── Header CTA ────────────────────────────────────── */
.header-cta {
  flex-shrink: 0;
  margin-left: var(--space-4);
  background-color: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-6);
  font-size: var(--text-sm);
}

.header-cta:hover {
  background-color: #7a9835;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* ── Hamburger ─────────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  margin-left: auto;
  cursor: pointer;
  background: transparent;
  border: none;
  flex-shrink: 0;
}

.hamburger__line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #fff;
  border-radius: var(--radius-full);
  transition: transform var(--duration-base) var(--ease-in-out),
              opacity var(--duration-fast) var(--ease-out);
  transform-origin: center;
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 900px) {
  .primary-nav,
  .header-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Mobile menu open */
  .primary-nav.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    inset: 72px 0 0 0;
    background-color: var(--color-primary-dark);
    padding: var(--space-6);
    overflow-y: auto;
    z-index: 999;
  }

  .primary-nav.is-open .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav.is-open .primary-nav__link {
    padding: var(--space-4) var(--space-2);
    border-bottom: 1px solid rgba(255,255,255,.1);
  }

  .primary-nav.is-open .primary-nav__item > ul {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: rgba(0,0,0,.2);
    border-radius: 0;
    padding-left: var(--space-4);
  }

  .primary-nav.is-open .primary-nav__item > ul li a {
    color: rgba(255,255,255,.8);
  }
}