#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 998;
  background: transparent;
  padding-top: var(--header-padding-top);
  transition: var(--transition-default);
}

#header.xg {
  background: var(--color-surface-canvas);
  box-shadow: var(--shadow-header);
  padding-top: 0;
}

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

#logo a {
  display: flex;
  align-items: center;
  height: var(--header-height);
}

.logo-img {
  display: block;
  height: 78px;
  width: auto;
  max-height: calc(var(--header-height) - 0.25rem);
}

.header-right {
  flex: 1;
  max-width: var(--nav-area-max);
  display: flex;
  justify-content: flex-end;
}

#nav ul {
  display: flex;
  gap: 0.25rem;
}

#nav ul li {
  position: relative;
}

#nav .nav-label {
  display: inline-block;
  padding: 0 0.75rem;
  line-height: var(--header-height);
  font-size: 1rem;
  color: var(--color-text-on-dark);
  position: relative;
  transition: var(--transition-default);
}

#nav .nav-label::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: #fff;
  transition: width var(--transition-default);
}

#nav ul li:hover .nav-label::after,
#nav ul li.on .nav-label::after {
  width: 100%;
}

#header.xg #nav .nav-label {
  color: var(--color-text-strong);
}

#header.xg #nav .nav-label::after {
  background: var(--color-brand-nav-active);
}

#nav ul li.on .nav-label {
  color: var(--color-brand-deep);
}

#header.xg #nav ul li.on .nav-label {
  color: var(--color-brand-deep);
}

#nav .sub {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  width: 150px;
  background: #fff;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-default);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

#nav ul li:hover .sub {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

#nav .sub-box a {
  display: block;
  padding: 0.65rem 1rem;
  font-size: 0.9rem;
  color: var(--color-text-primary);
  transition: color var(--transition-default);
}

#nav .sub-box a:hover {
  color: var(--color-brand-deep);
}

.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 997;
  background: #fff;
  box-shadow: var(--shadow-header);
}

.mobile-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.mobile-logo {
  display: flex;
  align-items: center;
}

.mobile-logo .logo-img {
  height: 48px;
  max-height: none;
}

.menu-toggle {
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 10px;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text-strong);
  transition: var(--transition-default);
}

#m-nav {
  position: fixed;
  top: 0;
  right: -105%;
  width: 100%;
  max-width: 360px;
  height: 100vh;
  z-index: 9999;
  background: var(--gradient-mobile-nav);
  padding: 4rem 2rem 2rem;
  overflow-y: auto;
  transition: right 0.3s ease-out;
}

#m-nav.open { right: 0; }

.m-nav-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
}

#m-nav .m-nav-link {
  display: block;
  padding: 1rem 0;
  color: #fff;
  font-size: 1.125rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.m-nav-sub {
  padding-left: 1rem;
  margin-bottom: 0.5rem;
}

.m-nav-sub a {
  display: block;
  padding: 0.5rem 0;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
}

.m-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 9998;
}

@media (max-width: 1200px) {
  #header { display: none; }
  .mobile-header { display: block; }
  body.page-about,
  body.page-products,
  body.page-technology,
  body.page-contact {
    padding-top: 60px;
  }
  body.page-home {
    padding-top: 0;
  }
}

@media (max-width: 1200px) {
  body.page-home .mobile-header {
    background: transparent;
    box-shadow: none;
  }
  body.page-home .mobile-header.scrolled {
    background: #fff;
    box-shadow: var(--shadow-header);
  }
  body.page-home .menu-toggle span { background: #fff; }
  body.page-home .mobile-header.scrolled .menu-toggle span { background: var(--color-text-strong); }
}