/* One stable header footprint: the navigation changes appearance without shifting the page. */
#site-header {
  position: sticky;
  top: -36px;
  z-index: 50;
  background: #071827;
  isolation: isolate;
  transition: background-color .38s ease;
}
#site-header .utility-row { min-height: 36px; font-size: 12px; }
#site-header .main-nav {
  position: relative;
  height: 88px;
  gap: 30px;
  border: 1px solid transparent;
  border-bottom-color: transparent;
  border-radius: 0;
  transition: padding .45s cubic-bezier(.22,1,.36,1), border-radius .45s cubic-bezier(.22,1,.36,1);
}
#site-header::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background: rgba(248, 252, 255, .67);
  border-bottom: 1px solid #ffffff99;
  box-shadow: 0 8px 28px #0a2b4110;
  backdrop-filter: blur(24px) saturate(145%);
  -webkit-backdrop-filter: blur(24px) saturate(145%);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity .38s ease, transform .45s cubic-bezier(.22,1,.36,1);
}
#site-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  border-bottom: 1px solid #ffffff18;
  pointer-events: none;
  transition: border-color .38s ease;
}
#site-header.is-scrolled::after { border-bottom-color: #426c801f; }
#site-header.is-scrolled { background: transparent; color: #18364a; }
#site-header.is-scrolled .main-nav { padding-inline: 0; border-bottom-color: transparent; }
#site-header.is-scrolled::before { opacity: 1; transform: translateY(0); }
#site-header .brand { display: grid; align-items: center; }
#site-header .brand img {
  grid-area: 1 / 1;
  transform-origin: center;
  transform: perspective(700px) rotateY(0deg) scale(1);
  transition: transform .85s cubic-bezier(.45,0,.2,1), opacity .12s ease .34s;
}
#site-header .brand-logo-dark { opacity: 0; }
#site-header.is-scrolled .brand img { transform: perspective(700px) rotateY(360deg) scale(.94); }
#site-header.is-scrolled .brand-logo-light { opacity: 0; }
#site-header.is-scrolled .brand-logo-dark { opacity: 1; }
#site-header .nav-links a, #site-header .nav-login, #site-header .menu-toggle { transition: color .3s ease, background-color .3s ease, border-color .3s ease; }
#site-header.is-scrolled .nav-links a { color: #18364a; }
#site-header.is-scrolled .nav-links a:hover, #site-header.is-scrolled .nav-links a[aria-current="page"] { color: #006f96; }
#site-header.is-scrolled .nav-login { color: #29495e; }
#site-header.is-scrolled .menu-toggle { color: #17384d; border-color: #61859d55; background: #ffffff38; }
#site-header.is-scrolled .nav-panel { color: #007ca6; border-color: #049ac94d; background: #f1fcff45; }
#site-header.is-scrolled .nav-panel:hover { color: #006d95; background: #e2f7feaa; border-color: #0099cd; }
#site-header.is-scrolled .nav-panel:focus-visible { outline-color: #007ca6; }
#site-header .nav-links { gap: 22px; font-size: 13px; }
#site-header .nav-actions { gap: 12px; }
#site-header .nav-login { font-size: 14px; }
#site-header .nav-login,
#site-header .nav-panel {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid #22c9ef55;
  border-radius: 8px;
  color: #22c9ef;
  background: #22c9ef0d;
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
  transition: background-color .22s ease, border-color .22s ease, box-shadow .22s ease;
}
#site-header .nav-login { color: #e6f2f9; border-color: #d2e9f03d; background: #ffffff08; }
#site-header .nav-login:hover { color: #fff; border-color: #b8d6e17a; background: #ffffff12; }
#site-header.is-scrolled .nav-login { color: #29495e; border-color: #547b9455; background: #ffffff38; }
#site-header.is-scrolled .nav-login:hover { color: #102f43; border-color: #547b9499; background: #ffffff80; }
#site-header .nav-login:focus-visible { outline: 2px solid currentColor; outline-offset: 4px; }
#site-header .nav-login .icon, #site-header .nav-panel .icon { width: 17px; height: 17px; }
#site-header .nav-panel:hover { background: #22c9ef1c; border-color: #22c9ef; box-shadow: 0 0 22px #22c9ef12; }
#site-header .nav-panel:focus-visible { outline: 2px solid #7ce5fc; outline-offset: 4px; }
[data-plan][aria-disabled="true"] { opacity: .55; cursor: not-allowed; }
@media (max-width: 1180px) {
  #site-header .main-nav { gap: 20px; }
  #site-header .nav-links { gap: 17px; }
  #site-header .nav-actions { gap: 14px; }
}
@media (max-width: 1100px) {
  #site-header .nav-links {
    display: none;
    position: absolute;
    top: calc(100% - 5px);
    left: 0;
    right: 0;
    margin: 0;
    padding: 22px;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    border: 1px solid #36576a;
    border-radius: 12px;
    background: #0e293c;
    box-shadow: 0 18px 30px #07182730;
    max-height: calc(100dvh - 130px);
    overflow-y: auto;
    font-size: 15px;
  }
  #site-header .nav-links.is-open { display: flex; }
  #site-header.is-scrolled .nav-links { background: #f7fbffed; backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); border-color: #aac6d67a; box-shadow: 0 15px 32px #173a4d1a; }
  #site-header .nav-links a[aria-current="page"]::after { bottom: -5px; right: auto; width: 25px; }
  #site-header .nav-actions { margin-left: auto; }
  #site-header .menu-toggle { display: block; }
}
@media (max-width: 720px) {
  #site-header .main-nav { height: 78px; gap: 12px; }
  #site-header.is-scrolled .main-nav { padding-inline: 0; }
  #site-header .nav-actions { gap: 8px; }
  #site-header .brand, #site-header .brand img { width: 104px; }
  #site-header .nav-login, #site-header .nav-panel { padding: 9px 10px; font-size: 13px; min-height: 40px; gap: 6px; }
  #site-header .nav-login .icon, #site-header .nav-panel .icon { width: 15px; height: 15px; }
}
@media (max-width: 520px) {
  #site-header .utility-row > span { display: none; }
  #site-header .utility-right { margin-left: auto; }
}
@media (max-width: 400px) {
  #site-header .main-nav { gap: 8px; }
  #site-header .brand, #site-header .brand img { width: 88px; }
  #site-header .nav-actions { gap: 9px; }
  #site-header.is-scrolled .main-nav { padding-inline: 0; }
  #site-header .nav-login, #site-header .nav-panel { gap: 4px; padding-inline: 8px; }
}
@media (max-width: 380px) {
  #site-header .nav-login-label { display: none; }
  #site-header .nav-login { width: 38px; padding-inline: 0; }
}
@media (prefers-reduced-motion: reduce) {
  #site-header, #site-header .main-nav, #site-header::before, #site-header::after,
  #site-header .brand img, #site-header .nav-panel, #site-header .nav-login { transition: none; }
}
@media print { #site-header { display: none; } }