/**
 * MFG Machinery — Header: sticky header, navigation, mega menu, language switcher
 */

/* ----- Header (sticky) ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  /* background: var(--color-accent); */
  color: var(--color-white);
  transition: box-shadow var(--transition);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  min-height: var(--header-height);
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.logo img {
  display: block;
  height: 50px;
  width: auto;
  object-fit: contain;
}

.logo:hover,
.logo:focus-visible {
  color: var(--color-accent);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-white);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.875rem;
}

.nav-toggle:focus-visible {
  outline-color: var(--color-white);
}

/* Main navigation */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  align-items: center;
}

.main-nav > ul > li > a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  position: relative;
  background: linear-gradient(
    120deg,
    rgba(255, 255, 255, 0.16) 0%,
    rgba(255, 255, 255, 0.04) 100%
  );
  background-size: 100% 0%;
  background-repeat: no-repeat;
  background-position: left bottom;
  transition: color var(--transition), background-size var(--transition);
}

.main-nav > ul > li > a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transform: scaleX(0);
  transform-origin: left center;
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
}

.main-nav > ul > li > a:hover,
.main-nav > ul > li > a:focus-visible {
  color: var(--color-white);
  cursor: pointer;
  background-size: 100% 100%;
}

.main-nav > ul > li > a:hover::after,
.main-nav > ul > li > a:focus-visible::after {
  transform: scaleX(1);
  opacity: 1;
}

.main-nav > ul > li > a.active {
  color: var(--color-white);
  background-size: 100% 100%;
}

.main-nav > ul > li > a.active::after {
  transform: scaleX(1);
  opacity: 1;
}

.main-nav > ul > li > a.active:hover,
.main-nav > ul > li > a.active:focus-visible {
  color: var(--color-white);
}

/* Header product mega menu */
.main-nav .nav-item--mega {
  position: relative;
}

.mega-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  width: min(600px, calc(100vw - 2.5rem));
  min-width: 560px;
  padding: 0.1rem 1rem 0.95rem;
  border-radius: 10px;
  border: 1px solid rgba(44, 62, 80, 0.1);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 16px 40px rgba(44, 62, 80, 0.2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition),
    visibility var(--transition);
  z-index: 1200;
}

.mega-menu__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.1rem;
}

.mega-menu__group {
  min-width: 0;
}

.mega-menu__title {
  margin: 0 0 0.55rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid rgba(44, 62, 80, 0.12);
  color: var(--color-primary);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.mega-menu__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.mega-menu__list li + li {
  margin-top: 0;
}

.mega-menu__list a {
  display: inline-block;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  border-bottom: none;
  color: rgba(44, 62, 80, 0.86);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  background: linear-gradient(
    120deg,
    rgba(45, 70, 106, 0.12) 0%,
    rgba(45, 70, 106, 0.03) 100%
  );
  background-size: 100% 0%;
  background-repeat: no-repeat;
  background-position: left bottom;
  transition: color var(--transition), background-size var(--transition);
}

.mega-menu__list a:hover,
.mega-menu__list a:focus-visible {
  color: var(--color-accent);
  background-size: 100% 100%;
}

.mega-menu__list a.is-active {
  color: var(--color-accent);
  background-size: 100% 100%;
}

.main-nav .nav-item--mega::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 8px;
}

.main-nav .nav-item--mega:hover > .mega-menu,
.main-nav .nav-item--mega:focus-within > .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* Language switcher */
.lang-switcher {
  display: flex;
  gap: 0.35rem;
}

.lang-select {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--color-white);
  padding: 0.35rem 1.7rem 0.35rem 0.65rem;
  border-radius: 4px;
  font-size: 0.8125rem;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.lang-select:hover,
.lang-select:focus-visible {
  border-color:  var(--color-white);
  color:  var(--color-white);
  outline: none;
}

.lang-select option {
  color: var(--color-primary);
}

.lang-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--color-white);
  padding: 0.35rem 0.65rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8125rem;
  transition: background var(--transition), border-color var(--transition);
}

.lang-btn:hover,
.lang-btn:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.lang-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-primary);
  font-weight: 600;
}

/* ----- Responsive: tablet / mobile nav ----- */
@media (max-width: 899px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    width: 100%;
    order: 4;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .main-nav.is-open {
    max-height: 80vh;
    overflow-y: auto;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.5rem 0 1rem;
    gap: 0;
  }

  .main-nav a {
    display: block;
    padding: 0.5rem 0;
  }

  .main-nav > ul > li > a {
    padding: 0.5rem 0.4rem;
    border-radius: 4px;
    background: linear-gradient(
      120deg,
      rgba(255, 255, 255, 0.2) 0%,
      rgba(255, 255, 255, 0.05) 100%
    );
    background-size: 100% 0%;
  }

  .main-nav .nav-item--mega {
    width: 100%;
  }

  .main-nav .nav-item--mega::after {
    display: none;
  }

  .mega-menu {
    position: static;
    min-width: 0;
    margin: 0.4rem 0 0.6rem;
    padding: 0.75rem 0.8rem;
    border-radius: 8px;
    border-color: rgba(255, 255, 255, 0.16);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    max-height: none;
    overflow: visible;
    display: none;
    transition: none;
  }

  .main-nav .nav-item--mega.is-expanded > .mega-menu {
    display: block;
  }

  .mega-menu__grid {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .mega-menu__title {
    color: rgba(255, 255, 255, 0.95);
    border-bottom-color: rgba(255, 255, 255, 0.18);
  }

  .mega-menu__list a {
    color: rgba(255, 255, 255, 0.84);
    font-size: 0.84rem;
  }

  .mega-menu__list a:hover,
  .mega-menu__list a:focus-visible {
    color: var(--color-white);
  }

  .mega-menu--news {
    width: 100%;
    max-width: none;
    padding: 0.45rem 0.55rem;
  }

  .mega-menu--news .mega-menu__list a {
    font-size: 1rem;
    padding: 0.45rem 0.65rem;
  }

  .header-inner {
    align-items: center;
  }
}

@media (max-width: 480px) {
  .lang-switcher {
    width: 100%;
    justify-content: flex-end;
  }
}