/* Shared live-page header surface; dated archive copies retain their original header. */
.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] {
  --vfr-surface-height: 80px;
  --vfr-mobile-header-padding: 8px 20px;
  --vfr-mobile-control-size: 52px;
  --vfr-mobile-icon-size: 24px;
  --vfr-mobile-control-ink: var(--vfr-surface-ink);
  --vfr-mobile-control-bg: color-mix(in srgb, #0a0a0a 3%, hsl(40 18% 97%));
  --vfr-mobile-control-hover: color-mix(in srgb, #0a0a0a 7%, hsl(40 18% 97%));
  --vfr-bar-max: 81rem;
  --vfr-bar-inset: 16px;
  --vfr-surface-ink: #0a0a0a;
  --vfr-surface-divider: #d5d9e2;
  position: fixed;
  inset: 0 0 auto;
  isolation: isolate;
  padding: 0;
  background: transparent;
  transition: background-color 200ms;
}

/* A separate layer keeps backdrop-filter from trapping the fixed mobile drawer. */
.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] > .vfr-header-surface {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  visibility: visible;
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transform: translateZ(0);
  backface-visibility: hidden;
}

/*
 * Keep the expensive blur on one persistent compositor layer. Scroll state
 * now changes only its opacity, avoiding the intermittent flash caused by
 * rebuilding a negative-z backdrop-filter layer while the page is moving.
 */
.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] > .vfr-header-surface::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgb(255 255 255 / 85%);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  opacity: 1;
  transform: translateZ(0);
  backface-visibility: hidden;
  will-change: opacity;
  transition: opacity 220ms cubic-bezier(.165, .84, .44, 1);
}

@media (prefers-reduced-motion: reduce) {
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] > .vfr-header-surface::before {
    transition: none;
  }
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-bar {
  z-index: 1;
  height: var(--vfr-surface-height);
  max-width: var(--vfr-bar-max);
  padding: 10px var(--vfr-bar-inset);
  border-radius: 0;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-bar::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  pointer-events: none;
  background: rgb(213 217 226 / 50%);
  opacity: 0;
  transition: opacity 200ms;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"].is-scrolled .vfr-nav-bar::after {
  opacity: 1;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] :is(.vfr-bar-veils, .vfr-links-veil, .vfr-auth-veil) {
  display: none;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] :is(.vfr-nav-brand-box, .vfr-nav-actions) {
  position: relative;
  z-index: 2;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-auth {
  padding: 12px;
  font-weight: 500;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-auth :where(*) {
  font-weight: 500;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-auth .vfr-nav-cta,
.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-auth .vfr-nav-cta :where(*) {
  font-weight: 600;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-language-switcher {
  display: flex;
  align-items: center;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] :is(.vfr-mobile-menu-header, .vfr-mobile-menu-footer) {
  display: none;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-links {
  margin: 0;
  list-style: none;
  font-size: 15px;
}

.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-chevron {
  display: none;
}

/* Mobile controls share the standard header burger and language selector. */
.serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-controls {
  display: none;
}

@media (max-width: 831px) {
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] {
    --vfr-surface-height: 80px;
    --vfr-mobile-header-padding: 8px 20px;
    --vfr-mobile-control-size: 44px;
    --vfr-mobile-icon-size: 24px;
    --vfr-mobile-control-ink: var(--vfr-neutral-700);
    --vfr-mobile-control-bg: transparent;
    /* Touch can retain :hover after the close button returns focus to the burger. */
    --vfr-mobile-control-hover: transparent;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-bar {
    padding: var(--vfr-mobile-header-padding);
  }
}

@media (max-width: 831px) {
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] :is(.vfr-nav-bar, .vfr-mobile-menu-header) {
    column-gap: 4px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-actions {
    display: none;
  }

  /* Identical controls geometry keeps the language button still across the wipe. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] :is(.vfr-mobile-controls, .vfr-mobile-menu-controls) {
    position: relative;
    z-index: 2;
    display: inline-flex;
    flex: none;
    align-items: center;
    gap: 8px;
  }

  /*
   * Subpage header variant: keep the idle top surface completely clear.
   * Interactive overlays deliberately restore the standard surface so the
   * drawer edge and language menu never flash against page content.
   */
  .serim-shared-header.vf-header-reference
    .vfr-site-nav[data-vfr-surface="full-width"][data-vfr-variant="transparent-top"]:not(.is-scrolled):not(.is-drawer-open):not([data-state~="menu-open"]):not(:has([data-vfr-language-placement="mobile"] [data-language-toggle][aria-expanded="true"]))
    > .vfr-header-surface::before {
    opacity: 0;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"].is-scrolled > .vfr-header-surface::before {
    opacity: 1;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"].is-drawer-open > .vfr-header-surface::before {
    background: #fff;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    opacity: 1;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"].is-drawer-open .vfr-nav-bar::after {
    opacity: 0;
  }

  /* Opening and closing controls share the same target and icon dimensions. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-burger {
    flex: none;
    width: var(--vfr-mobile-control-size);
    height: var(--vfr-mobile-control-size);
    margin: 0;
    padding: 0;
    color: var(--vfr-mobile-control-ink);
    background: var(--vfr-mobile-control-bg);
    border-radius: 50%;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-burger:is(:hover, :focus-visible) {
    background: var(--vfr-mobile-control-hover);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-burger svg {
    display: block;
    width: var(--vfr-mobile-icon-size);
    height: var(--vfr-mobile-icon-size);
  }

  /* Keep the icon state change in step with the drawer wipe. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-burger-icon {
    transform-origin: center;
    will-change: opacity, transform;
    transition: opacity 240ms cubic-bezier(.165, .84, .44, 1),
      transform 320ms cubic-bezier(.165, .84, .44, 1);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"].is-drawer-open .vfr-nav-drawer {
    z-index: 50;
    inset: 0;
    max-height: none;
    overflow: visible;
  }

  /* Header, list and footer share one viewport scroll container. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"].is-drawer-open .vfr-nav-menu {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior-y: contain;
    -webkit-overflow-scrolling: touch;
    background: #fff;
    color: var(--vfr-surface-ink);
    outline: 2px solid transparent;
    outline-offset: 2px;
    overflow-anchor: none;
  }

  /* Match the normal bar; the logo reuses its original markup and sizing. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-header {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: space-between;
    height: var(--vfr-surface-height);
    padding: var(--vfr-mobile-header-padding);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-cta:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px rgb(10 10 10 / 30%);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-menu-inner {
    display: block;
    flex: 1 0 auto;
    padding: 0 28px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-links {
    z-index: auto;
    flex: none;
    align-items: stretch;
    width: 100%;
    min-width: 0;
    max-width: none;
    gap: 0;
    padding: 16px 0;
    overflow: visible;
    background: transparent;
    border: 0;
    border-radius: 0;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-item {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    justify-content: flex-start;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-links > .vfr-nav-item + .vfr-nav-item {
    border-top: 1px solid var(--vfr-surface-divider);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-link {
    justify-content: space-between;
    width: 100%;
    min-height: 52px;
    padding: 12px 0;
    color: var(--vfr-surface-ink);
    font-size: 18px;
    font-weight: 500;
    line-height: 28px;
    text-align: left;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-link .vfr-link-dot {
    display: none;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-link .vfr-link-chevron {
    color: rgb(10 10 10 / 30%);
    transform: none;
    transition: none;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-link .vfr-link-chevron svg:not(.vfr-mobile-chevron) {
    display: none;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-chevron {
    display: block;
    transform: none;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-sub {
    flex: none;
    min-height: 0;
    padding: 0;
    overflow: hidden;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-sub:not([hidden]) {
    /* Override the legacy mobile submenu's !important flex layout. */
    display: block !important;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-sub-inner {
    display: flex;
    flex-direction: column;
    width: 100%;
    gap: 4px;
    padding: 0 0 12px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-sub-link {
    width: 100%;
    padding: 10px 12px;
    color: var(--vfr-surface-ink);
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    text-align: left;
    border-radius: 12px;
    transition: color 150ms cubic-bezier(.4, 0, .2, 1), background-color 150ms cubic-bezier(.4, 0, .2, 1), border-color 150ms cubic-bezier(.4, 0, .2, 1);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-sub-link:is(:hover, :focus-visible) {
    background: rgb(10 10 10 / 4%);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-footer {
    display: block;
    flex: none;
    padding: 16px 24px max(32px, env(safe-area-inset-bottom, 0px));
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 44px;
    padding: 12px 20px;
    border: 0;
    border-radius: 9999px;
    background: var(--vfr-surface-ink);
    color: #fff;
    font-family: "UCity Pro", var(--vfr-font-sans);
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    text-decoration: none;
    transition: color 150ms cubic-bezier(.4, 0, .2, 1), background-color 150ms cubic-bezier(.4, 0, .2, 1), border-color 150ms cubic-bezier(.4, 0, .2, 1), filter 150ms cubic-bezier(.4, 0, .2, 1);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-cta:hover {
    filter: brightness(.9);
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-shortcuts {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
    color: rgb(10 10 10 / 40%);
    font-family: var(--vfr-font-nav);
    font-size: 14px;
    line-height: 16px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-shortcuts a {
    color: inherit;
    text-decoration: none;
    transition: color 150ms;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-mobile-menu-shortcuts a:hover {
    color: var(--vfr-surface-ink);
  }
}

@media (min-width: 832px) {
  /* Keep the final CTA geometry invariant while its local font becomes ready. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-cta {
    box-sizing: border-box;
    inline-size: 120px;
    min-inline-size: 120px;
    max-inline-size: 120px;
    flex: 0 0 120px;
    justify-content: center;
    padding-inline: 0;
  }

  /* Opt-in subpage variant; .is-scrolled restores the default surface above. */
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"][data-vfr-variant="transparent-top"]:not(.is-scrolled) > .vfr-header-surface::before {
    opacity: 0;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] {
    --vfr-surface-height: 80px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-bar {
    padding-block: 0;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-brand-box {
    flex: 1;
    min-width: max-content;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-actions {
    flex: 1;
    justify-content: flex-end;
    min-width: max-content;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-menu {
    flex: none;
  }
}

@media (min-width: 1024px) {
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] {
    --vfr-bar-inset: 24px;
  }
}

/* Keep the 15px labels and both controls visible on compact desktop widths. */
@media (min-width: 832px) and (max-width: 1100px) {
  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] {
    --vfr-bar-inset: 8px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-bar {
    column-gap: 4px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-logo img {
    margin-inline: 0;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-links {
    gap: 2px;
    padding-inline: 0;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-link {
    padding-inline: 2px;
  }

  .serim-shared-header.vf-header-reference .vfr-site-nav[data-vfr-surface="full-width"] .vfr-nav-auth {
    padding-inline: 0;
  }
}