/* Shared blog navigation: a stable flow slot and an independently fixed bar. */
html.studens-header-page,
html.studens-header-page body { overflow-x: clip; }
html.studens-header-page { scroll-padding-top: 117px; }

.studens-header-slot {
  height: 101px;
  min-height: 101px;
  width: 100%;
}

nav.studens-header.glass-nav {
  --header-top-space: 20px;
  --header-row-height: 80px;
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  width: 100%;
  box-sizing: border-box;
  padding-top: var(--header-top-space);
  overflow: visible;
  background: transparent;
  border-bottom: 1px solid transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition: padding-top .55s cubic-bezier(.22,.68,.34,1), background-color .55s cubic-bezier(.22,.68,.34,1), border-color .55s cubic-bezier(.22,.68,.34,1), box-shadow .55s cubic-bezier(.22,.68,.34,1);
}

nav.studens-header.glass-nav.is-scrolled {
  --header-top-space: 0px;
  --header-row-height: 68px;
  background: rgba(5, 9, 20, .83);
  border-bottom-color: rgba(59,130,246,.17);
  box-shadow: 0 8px 32px rgba(2,6,23,.2), 0 1px 15px rgba(59,130,246,.035);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
}

.studens-header > .studens-header-row {
  position: relative;
  width: 100%;
  max-width: 1440px;
  height: var(--header-row-height);
  margin-inline: auto;
  padding: 16px 24px;
  box-sizing: border-box;
  transition: max-width .55s cubic-bezier(.22,.68,.34,1), height .55s cubic-bezier(.22,.68,.34,1), padding .55s cubic-bezier(.22,.68,.34,1);
}

/* The links follow the page centre, independent of either side's width. */
.studens-header-row > div:has(> .nav-dropdown) {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: max-content;
  white-space: nowrap;
}

nav.studens-header form.studens-header-search {
  display: block;
  position: relative;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  transition: width .2s ease;
}
.studens-header .studens-header-search input {
  box-sizing: border-box;
  width: 100%;
  height: 40px;
  padding: 8px 38px 8px 14px;
}
.studens-header .studens-header-search:not(.is-search-open) input {
  padding-inline: 0;
  color: transparent;
  cursor: pointer;
}
.studens-header .studens-header-search:not(.is-search-open) input::placeholder {
  color: transparent;
}
.studens-header .studens-header-search button {
  right: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
}
.studens-header .studens-header-search.is-search-open { width: 168px; }

@media (min-width: 768px) and (max-width: 1100px) {
  .studens-header-row > div:has(> .nav-dropdown) { gap: 16px; }
  .studens-header:has(.nav-dropdown) > .studens-header-row,
  .studens-header.is-scrolled:has(.nav-dropdown) > .studens-header-row { padding-inline: 20px; }
  .studens-header .studens-header-search.is-search-open { width: 40px; }
  .studens-header .studens-header-search.is-search-open input {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 220px;
    padding-inline: 14px;
    background: #0c1425;
    z-index: 1;
  }
}

.studens-header.is-scrolled > .studens-header-row {
  max-width: 1200px;
  padding: 14px 32px;
}

.studens-header #mobile-menu-btn {
  min-width: 44px;
  min-height: 44px;
  flex-shrink: 0;
}
.studens-header #mobile-menu {
  max-height: calc(100vh - var(--header-top-space) - var(--header-row-height) - 1px);
  max-height: calc(100dvh - var(--header-top-space) - var(--header-row-height) - 1px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-bottom: max(24px, env(safe-area-inset-bottom));
}
.studens-header #mobile-menu[hidden] { display: none; }

.studens-header .nav-dropdown > .nav-dropdown-menu {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(8px);
  transition: opacity .2s ease, transform .2s ease;
  transition-delay: 0s;
}
.studens-header .nav-dropdown.is-open > .nav-dropdown-menu,
.studens-header:not([data-studens-header-ready]) .nav-dropdown:is(:hover, :focus-within) > .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.studens-header :is(a,button,input):focus-visible {
  outline: 2px solid #60a5fa;
  outline-offset: 4px;
}

@media (max-width: 767px) {
  html.studens-header-page { scroll-padding-top: 101px; }
  .studens-header-slot { height: 85px; min-height: 85px; }
  nav.studens-header.glass-nav { --header-top-space: 12px; --header-row-height: 72px; }
  nav.studens-header.glass-nav.is-scrolled { --header-top-space: 0px; --header-row-height: 64px; }
  .studens-header > .studens-header-row,
  .studens-header.is-scrolled > .studens-header-row {
    max-width: 100%;
    padding: 10px 20px;
  }
}

@media (max-width: 767px) and (max-height: 480px) {
  .studens-header #mobile-menu {
    padding-bottom: max(84px, env(safe-area-inset-bottom));
  }
}

@media (prefers-reduced-motion: reduce) {
  nav.studens-header.glass-nav,
  .studens-header > .studens-header-row,
  .studens-header .studens-header-search,
  .studens-header .nav-dropdown > .nav-dropdown-menu { transition: none; }
}