/* The research archive uses the same navigation frame as PersonalHeader. */
/* The legacy Astro export uses overflow-x:hidden on body, which traps sticky positioning. */
html:has(.papers-site-header),
body.papers-editorial:has(> .papers-site-header) { overflow-x: clip; }

.papers-header.papers-site-header {
  position: sticky !important;
  inset: auto !important;
  top: 0 !important;
  z-index: 40;
  display: block;
  max-width: none;
  margin: 0;
  padding: 0;
  background: #080808 !important;
}

.papers-site-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 32px;
  min-height: 80px;
  max-width: 1800px;
  margin-inline: auto;
  padding: 12px 24px;
}

.papers-site-header .papers-brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.papers-site-header .fernando-signature {
  display: block;
  width: 160px;
  height: auto;
}

.papers-site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 24px;
  font: 14px/20px Arial, sans-serif;
}

.papers-site-nav > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #f5f5f3;
}

.papers-site-nav > a:hover { color: #f6d365; }
.papers-site-nav > a[aria-current="page"] { color: #f5f5f3; }

.papers-site-header .papers-language {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #b9b9b6;
  font-size: 14px;
  white-space: nowrap;
}

.papers-site-header .papers-language button {
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #b9b9b6;
  font: inherit;
  cursor: pointer;
}

.papers-site-header .papers-language button[aria-pressed="true"] {
  color: #f5f5f3;
  text-decoration: underline;
  text-decoration-color: #e9a23b;
  text-underline-offset: 5px;
}

.papers-site-header .papers-language button:hover { color: #fff; }
.papers-site-header .papers-language > span { color: #777; font-size: inherit; }
.papers-site-nav > .papers-site-contact { color: #fff; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
.papers-site-contact > span { position: relative; }
.papers-site-contact > span::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: -5px;
  left: 0;
  height: 2px;
  background: linear-gradient(108deg, #f6d365 0%, #e9a23b 34%, #d64a3a 68%, #8f123b 100%);
  transform: scaleX(0);
  transform-origin: left;
}
.papers-site-contact:hover > span::after,
.papers-site-contact:focus-visible > span::after { transform: scaleX(1); }

.papers-local-tools {
  display: flex;
  justify-content: flex-end;
  max-width: 1440px;
  margin-inline: auto;
  padding: 0 4.1vw;
}
.papers-local-tools .search-open {
  display: inline-flex;
  align-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #b9b9b6;
  font: 14px/20px Arial, sans-serif;
  cursor: pointer;
}
.papers-local-tools .search-open:hover { background: transparent; color: #f6d365; }
.papers-local-tools .search-open > span { display: inline !important; }

html:has(.papers-site-header) { scroll-padding-top: calc(var(--papers-header-height, 80px) + 16px); }
.papers-site-header :is(a, button):focus-visible,
.papers-local-tools button:focus-visible { outline: 2px solid #f6d365; outline-offset: 5px; }

@media (min-width: 640px) {
  .papers-site-header-inner { padding-inline: 40px; }
  .papers-site-header .papers-language { gap: 10px; }
}
@media (min-width: 1024px) {
  .papers-site-header-inner { padding-inline: 4.1vw; }
  .papers-site-nav { column-gap: 36px; }
}
@media (max-width: 900px) {
  .papers-local-tools { padding-inline: 24px; }
}
@media (max-width: 639px) {
  .papers-site-header .fernando-signature { width: 144px; }
  .papers-site-nav { width: 100%; justify-content: space-between; column-gap: 16px; }
  html:has(.papers-site-header) { scroll-padding-top: calc(var(--papers-header-height, 164px) + 16px); }
}
@media (prefers-reduced-motion: no-preference) {
  .papers-site-nav > a { transition: color .2s; }
  .papers-site-contact > span::after { transition: transform .3s; }
}
@media print {
  .papers-header.papers-site-header { position: static !important; }
  .papers-site-nav,
  .papers-local-tools { display: none !important; }
}