.site-header.liquid-glass-surface.scroll-glass-header.is-lifted {
  isolation: isolate;
  overflow: hidden;
  border: 0.5px solid rgba(255, 255, 255, 0.28);
  border-bottom-color: rgba(99, 106, 117, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.46);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition:
    width 340ms cubic-bezier(0.22, 0.72, 0.2, 1),
    background 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease,
    border-radius 180ms ease;
}

/* The first viewport belongs to the hero. Glass only materializes after scroll. */
.site-header.liquid-glass-surface.scroll-glass-header.is-lifted:not(.scrolled) {
  overflow: hidden;
  border-color: transparent;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

/* Liquid mode: flat white tint, no header blur — SVG refraction lives on the layer. */
.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.scrolled {
  border: 0.5px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  background-clip: padding-box;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.scrolled.is-releasing,
.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.liquid-glass-surface--frosted.scrolled.is-releasing,
.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.liquid-glass-surface--opaque.scrolled.is-releasing {
  border-color: transparent;
  background: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.liquid-glass-surface--frosted.scrolled {
  border: 0.5px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
  -webkit-backdrop-filter: blur(22px) saturate(1.18);
  backdrop-filter: blur(22px) saturate(1.18);
}

.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.liquid-glass-surface--opaque.scrolled {
  border-radius: 999px;
  border-color: rgba(0, 0, 0, 0.08);
  background: rgba(248, 248, 249, 0.92);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.1);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

/* No side-highlight / bright rim on the scrolled glass shell. */
.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.scrolled::before,
.site-header.liquid-glass-surface.scroll-glass-header.is-lifted.scrolled::after {
  content: none;
  display: none;
}

.liquid-glass-filter-defs {
  position: absolute !important;
  width: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

.liquid-glass-surface__refraction,
.liquid-glass-surface__tint {
  position: absolute !important;
  inset: 0;
  overflow: hidden;
  border-radius: inherit !important;
  clip-path: inset(0 round 999px);
  opacity: 1;
  pointer-events: none;
  transition: opacity 260ms ease;
}

.site-header:not(.scrolled) > .liquid-glass-surface__refraction,
.site-header:not(.scrolled) > .liquid-glass-surface__tint,
.site-header.scrolled.is-releasing > .liquid-glass-surface__refraction,
.site-header.scrolled.is-releasing > .liquid-glass-surface__tint {
  opacity: 0;
}

.site-header:not(.scrolled) :is(.brand-symbol, .brand-wordmark) {
  filter: brightness(0);
}

.site-header:not(.scrolled) :is(.brand-division, .main-nav:not(.open) a) {
  color: rgba(17, 17, 17, 0.82);
  text-shadow: none;
}

.site-header:not(.scrolled) .nav-technology {
  border-left-color: rgba(0, 0, 0, 0.22);
}

.site-header:not(.scrolled) .main-nav:not(.open) a:hover,
.site-header:not(.scrolled) .main-nav:not(.open) a.active,
.site-header:not(.scrolled) .main-nav:not(.open) a[aria-current="page"] {
  color: #111;
  background: transparent;
  box-shadow: none;
  font-weight: 760;
}

.site-header:not(.scrolled) :is(.header-link, .header-cta) {
  border-color: transparent;
  color: #111;
  background: transparent;
  box-shadow: none;
}

.site-header:not(.scrolled) .icon-button {
  border-color: transparent;
  color: #111;
  background: transparent;
  filter: none;
}

/* Requiet Business opens on a consistently dark hero, so its minimal nav stays light. */
.join-site .site-header:not(.scrolled) :is(.brand-symbol, .brand-wordmark) {
  filter: brightness(0) invert(1) drop-shadow(0 1px 10px rgba(0, 0, 0, 0.2));
}

.join-site .site-header:not(.scrolled) :is(.brand-division, .main-nav:not(.open) a) {
  color: rgba(255, 255, 255, 0.82);
  text-shadow: 0 1px 14px rgba(0, 0, 0, 0.24);
}

.join-site .site-header:not(.scrolled) .nav-technology {
  border-left-color: rgba(255, 255, 255, 0.3);
}

.join-site .site-header:not(.scrolled) .main-nav:not(.open) a:hover,
.join-site .site-header:not(.scrolled) .main-nav:not(.open) a.active,
.join-site .site-header:not(.scrolled) .main-nav:not(.open) a[aria-current="page"] {
  color: #fff;
}

.join-site .site-header:not(.scrolled) :is(.header-link, .header-cta),
.join-site .site-header:not(.scrolled) .icon-button {
  color: #fff;
}

.join-site .site-header:not(.scrolled) .icon-button {
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.2));
}

/* The OS hero is deliberately dark; its transparent navigation needs the
   same light treatment before the glass surface appears. */
.os-site .site-header:not(.scrolled) :is(.brand-symbol, .brand-wordmark) {
  filter: brightness(0) invert(1) drop-shadow(0 1px 10px rgba(0, 0, 0, 0.24));
}

.os-site .site-header:not(.scrolled)
  :is(.brand-os-label, .main-nav:not(.open) a) {
  color: rgba(255, 255, 255, 0.84);
  text-shadow: 0 1px 14px rgba(0, 0, 0, 0.3);
}

.os-site .site-header:not(.scrolled) .main-nav:not(.open) a:hover,
.os-site .site-header:not(.scrolled) .main-nav:not(.open) a.active,
.os-site .site-header:not(.scrolled)
  .main-nav:not(.open)
  a[aria-current="page"] {
  color: #fff;
}

.os-site .site-header:not(.scrolled) :is(.header-link, .header-cta),
.os-site .site-header:not(.scrolled) .icon-button {
  color: #fff;
  filter: drop-shadow(0 1px 10px rgba(0, 0, 0, 0.24));
}

.site-header:not(.scrolled) .main-nav.open :is(a, .nav-group-label) {
  color: #555;
}

.site-header:not(.scrolled) .main-nav.open a:hover,
.site-header:not(.scrolled) .main-nav.open a.active,
.site-header:not(.scrolled) .main-nav.open a[aria-current="page"] {
  color: #111;
  background: rgba(0, 0, 0, 0.05);
  box-shadow: none;
}

/* One navigation position, two contexts: site pages above the hero, page chapters below it. */
.adaptive-nav {
  padding: 0;
  border-radius: 0;
}

.site-header .adaptive-nav .nav-face a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  color: #555;
  font-size: 13px;
  font-weight: 650;
  line-height: 1;
}

.nav-switcher {
  position: relative;
  width: min(55vw, 660px);
  height: 40px;
  overflow: hidden;
  perspective: 900px;
}

.adaptive-nav .nav-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform-origin: center center;
  transform: translateY(112%) rotateX(-10deg);
  transition:
    transform 420ms cubic-bezier(0.22, 0.72, 0.2, 1),
    opacity 260ms ease,
    visibility 0s linear 420ms;
}

.adaptive-nav .nav-face.is-current {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) rotateX(0);
  transition-delay: 0s;
}

.adaptive-nav .nav-global a:hover,
.adaptive-nav .nav-global a.active,
.adaptive-nav .nav-global a[aria-current="page"] {
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.adaptive-nav .nav-global a,
.adaptive-nav .nav-sections a {
  position: relative;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.adaptive-nav .nav-global a::after,
.adaptive-nav .nav-sections a::after {
  position: absolute;
  right: 12px;
  bottom: 3px;
  left: 12px;
  height: 1px;
  background: currentColor;
  content: "";
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms ease;
}

.adaptive-nav .nav-sections a:hover,
.adaptive-nav .nav-sections a.active,
.adaptive-nav .nav-sections a[aria-current="location"] {
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.adaptive-nav .nav-global a[aria-current="page"]::after,
.adaptive-nav .nav-global a:hover::after,
.adaptive-nav .nav-global a:focus-visible::after,
.adaptive-nav .nav-sections a:hover::after,
.adaptive-nav .nav-sections a.active::after,
.adaptive-nav .nav-sections a[aria-current="location"]::after {
  transform: scaleX(1);
}

.header-brand-cluster {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-self: start;
}

.global-menu-button {
  width: 32px;
  height: 32px;
  display: none;
  place-items: center;
  margin-left: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: #555;
  background: transparent;
  cursor: pointer;
  transition:
    color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.global-menu-button:hover,
.global-menu-button:focus-visible,
.global-menu-button[aria-expanded="true"] {
  color: #111;
  background: rgba(0, 0, 0, 0.055);
}

.global-menu-button:focus-visible {
  outline: 1px solid rgba(17, 17, 17, 0.5);
  outline-offset: 1px;
}

.global-menu-button:active {
  transform: scale(0.94);
}

.global-menu-button svg {
  width: 16px;
  height: 16px;
}

.global-menu-button .global-menu-close-icon,
.global-menu-button[aria-expanded="true"] .global-menu-open-icon {
  display: none;
}

.global-menu-button[aria-expanded="true"] .global-menu-close-icon {
  display: block;
}

@media (min-width: 1240px) {
  .site-header.section-nav-context .global-menu-button:not([hidden]) {
    display: inline-grid;
  }
}

.nav-return-button {
  position: absolute;
  top: 4px;
  right: 5px;
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: #555;
  background: transparent;
  cursor: pointer;
  transition:
    color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.nav-return-button:hover,
.nav-return-button:focus-visible {
  color: #111;
  background: rgba(0, 0, 0, 0.055);
}

.nav-return-button:active {
  transform: translateY(-2px);
}

.nav-return-button svg {
  width: 14px;
  height: 14px;
}

.site-header.section-nav-active .adaptive-nav [data-global-nav] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-112%) rotateX(10deg);
}

.site-header.section-nav-active .adaptive-nav [data-section-nav] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) rotateX(0);
  transition-delay: 0s;
}

.site-header :is(.brand-symbol, .brand-wordmark, .brand-division, .main-nav a, .header-link, .header-cta, .icon-button) {
  transition:
    color 220ms ease,
    filter 220ms ease,
    background 220ms ease,
    border-color 220ms ease,
    box-shadow 220ms ease;
}

/* Every hero uses the same vertical content anchor on desktop and mobile. */
:is(.brand-site, .about-site, .product-site) .hero-inner,
.join-site .join-hero-inner,
.os-site .hero-copy {
  justify-content: center;
  padding-top: 64px;
  padding-bottom: 64px;
}

.os-site .hero-copy {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.liquid-glass-surface__refraction {
  z-index: 0;
  background: transparent;
  -webkit-backdrop-filter: var(--liquid-surface-filter);
  backdrop-filter: var(--liquid-surface-filter);
}

.liquid-glass-surface__tint {
  z-index: 1;
  background: rgba(255, 255, 255, 0.36);
  box-shadow: none;
}

.site-header.liquid-glass-surface
  > :not(.liquid-glass-filter-defs):not(
    .liquid-glass-surface__refraction
  ):not(.liquid-glass-surface__tint) {
  z-index: 3;
}

@media (max-width: 1100px) {
  .site-header.liquid-glass-surface.scroll-glass-header.is-lifted {
    overflow: visible;
  }

  /* The transparent hero state clips the glass layers; an expanded mobile
     menu must be allowed to extend beyond that surface. */
  .site-header.liquid-glass-surface.scroll-glass-header.is-lifted.menu-open,
  .site-header.liquid-glass-surface.scroll-glass-header.is-lifted.menu-open:not(.scrolled) {
    overflow: visible;
  }

  .site-header.liquid-glass-surface .main-nav.open {
    z-index: 4;
  }

  .site-header .main-nav.open,
  .site-header.liquid-glass-surface .main-nav.open {
    top: calc(100% + 8px);
    right: 0;
    left: 0;
    display: grid;
    gap: 0;
    padding: 12px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 22px 56px rgba(20, 20, 24, 0.14);
    -webkit-backdrop-filter: blur(28px) saturate(1.05);
    backdrop-filter: blur(28px) saturate(1.05);
  }

  .main-nav.open .nav-switcher {
    width: 100%;
    height: auto;
    overflow: visible;
    perspective: none;
  }

  .main-nav.open .nav-face {
    position: static;
    display: none;
    align-items: stretch;
    justify-content: stretch;
    gap: 2px;
    padding: 4px 0 2px;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    transition: none;
  }

  .site-header:not(.section-nav-active) .main-nav.open [data-global-nav],
  .site-header.section-nav-active .main-nav.open [data-section-nav] {
    display: grid;
  }

  .main-nav.open .nav-group-label {
    display: block;
    margin: 0 0 6px;
    padding: 6px 14px 8px;
    color: #8a8a8a;
    font-size: 11px;
    font-weight: 650;
    letter-spacing: 0.04em;
    text-transform: none;
  }

  .main-nav.open .nav-face a {
    width: 100%;
    min-height: 48px;
    justify-content: flex-start;
    margin: 0;
    padding: 0 14px;
    border: 0;
    border-radius: 14px;
    color: #222;
    font-size: 15px;
    font-weight: 600;
    background: transparent;
    box-shadow: none;
  }

  .main-nav.open .nav-face a::after,
  .main-nav.open .nav-face a::before {
    display: none;
    content: none;
    box-shadow: none;
  }

  .site-header .main-nav.open .nav-face a:hover,
  .site-header .main-nav.open .nav-face a.active,
  .site-header .main-nav.open .nav-face a[aria-current],
  .site-header .main-nav.open .nav-face a:focus-visible,
  .site-header:not(.scrolled) .main-nav.open a:hover,
  .site-header:not(.scrolled) .main-nav.open a.active,
  .site-header:not(.scrolled) .main-nav.open a[aria-current="page"] {
    outline: 0;
    color: #111;
    background: rgba(0, 0, 0, 0.045);
    border: 0;
    box-shadow: none;
  }

  /* Secondary destinations: OS / business / digitalhe */
  .main-nav.open [data-global-nav] > a:nth-child(n + 5) {
    min-height: 44px;
    color: #555;
    font-size: 14px;
    font-weight: 600;
  }

  .main-nav.open [data-global-nav] > a:nth-child(5) {
    margin-top: 14px;
  }

  .main-nav.open .nav-face a[href$="/join/"],
  .main-nav.open .nav-face a[href$="/digitalhe/"],
  .main-nav.open .nav-face a[href*="tech.requiet"],
  .main-nav.open .nav-face a[href="./join/"],
  .main-nav.open .nav-face a[href="./digitalhe/"],
  .main-nav.open .nav-face a[href="../digitalhe/"],
  .main-nav.open .nav-face a[href="../join/"] {
    color: #555;
    font-size: 14px;
    font-weight: 600;
  }
}

@media (max-width: 820px) {
  .site-header :is(.site-brand, .brand) {
    transform-origin: left center;
    transition: transform 180ms cubic-bezier(0.22, 0.72, 0.2, 1);
  }

  .site-header .icon-button > svg {
    transition: transform 180ms cubic-bezier(0.22, 0.72, 0.2, 1);
  }

  .site-header:not(.scrolled) :is(.site-brand, .brand) {
    transform: scale(1.1);
  }

  .site-header:not(.scrolled) .menu-button > svg {
    transform: scale(1.22);
  }

  .site-header:not(.scrolled)
    .header-actions
    .icon-button:not(.menu-button)
    > svg {
    transform: scale(1.16);
  }

  .site-header.scrolled :is(.site-brand, .brand),
  .site-header.scrolled .icon-button > svg {
    transform: scale(1);
  }

  :is(.brand-site, .about-site, .product-site) .hero-inner,
  .join-site .join-hero-inner {
    justify-content: center;
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .os-site .hero-copy {
    width: calc(100% - 40px);
    height: var(--requiet-stable-vh, 100svh);
    min-height: var(--requiet-stable-vh, 100svh);
    justify-content: center;
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

@media (max-width: 480px) {
  .site-header.liquid-glass-surface.scroll-glass-header.is-lifted.scrolled {
    border-radius: 999px;
  }

  .liquid-glass-surface__refraction,
  .liquid-glass-surface__tint {
    clip-path: inset(0 round 999px);
  }
}

@media (prefers-reduced-transparency: reduce) {
  .liquid-glass-surface__refraction {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .adaptive-nav .nav-face {
    transition: opacity 120ms linear;
    transform: none !important;
  }
}