.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 1000;
  isolation: isolate;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(4, 9, 20, 0.42);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  transition:
    background 0.28s ease,
    border-color 0.28s ease,
    box-shadow 0.28s ease,
    transform 0.28s ease;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(77, 163, 255, 0.11), transparent 35%),
    radial-gradient(
      circle at 18% 14%,
      rgba(142, 197, 255, 0.12),
      transparent 24%
    ),
    radial-gradient(
      circle at 82% 0%,
      rgba(106, 228, 255, 0.07),
      transparent 30%
    );
  opacity: 0.38;
  animation: headerGlow 8s ease-in-out infinite;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(142, 197, 255, 0.65) 18%,
    rgba(77, 163, 255, 0.7) 50%,
    rgba(142, 197, 255, 0.65) 82%,
    transparent 100%
  );
  opacity: 0.5;
}

.site-header.is-ready .header-inner {
  animation: headerReveal 0.55s ease-out both;
}

.site-header.is-scrolled {
  background: rgba(3, 8, 18, 0.56);
  border-bottom-color: rgba(77, 163, 255, 0.2);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.24);
}

.site-header.is-scrolled::before {
  opacity: 0.52;
}

.site-header.is-scrolled .site-logo-mark-image {
  filter: drop-shadow(0 0 18px rgba(77, 163, 255, 0.36));
}

.site-header.is-scrolled .nav-toggle {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(77, 163, 255, 0.18);
}

.header-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-height);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.site-logo-mark {
  display: block;
  width: auto;
  height: 68px;
  flex-shrink: 0;
}

.site-logo-mark-image {
  display: block;
  width: auto;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(77, 163, 255, 0.26));
  transition:
    transform 0.25s ease,
    filter 0.25s ease;
}

.site-logo-copy {
  display: grid;
  gap: 0.12rem;
  line-height: 1;
  transform-origin: left center;
  transition:
    transform 0.25s ease,
    filter 0.25s ease,
    text-shadow 0.25s ease,
    opacity 0.25s ease;
}

.site-logo-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0em;
  text-transform: uppercase;
  color: var(--color-text);
}

.site-logo-v {
  color: var(--color-accent-soft);
  text-shadow: 0 0 14px rgba(77, 163, 255, 0.3);
}

.site-logo-subtitle {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent-soft);
}

.site-logo:hover .site-logo-mark-image {
  transform: scale(1.03);
  filter: drop-shadow(0 0 16px rgba(77, 163, 255, 0.34));
}

.site-logo:hover .site-logo-copy {
  transform: translateY(-1px) scale(1.03);
  filter: drop-shadow(0 0 16px rgba(77, 163, 255, 0.28));
}

.site-logo:hover .site-logo-title {
  color: var(--color-text);
  text-shadow: 0 0 16px rgba(77, 163, 255, 0.34);
}

.site-logo:hover .site-logo-v {
  color: var(--color-accent-soft);
  text-shadow: 0 0 18px rgba(77, 163, 255, 0.48);
}

.site-logo:hover .site-logo-subtitle {
  color: var(--color-accent-soft);
  text-shadow: 0 0 14px rgba(77, 163, 255, 0.28);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.6rem 0.95rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(7, 12, 24, 0.22);
  -webkit-backdrop-filter: blur(12px) saturate(125%);
  backdrop-filter: blur(12px) saturate(125%);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.12);
}

.site-nav a {
  position: relative;
  padding: 0.3rem 0;
  font-weight: 700;
  color: var(--color-text-soft);
  transition: color 0.2s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.1rem;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(
    135deg,
    var(--color-accent),
    var(--color-accent-strong)
  );
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-text);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.04);
}

.nav-toggle-lines {
  display: grid;
  gap: 0.22rem;
}

.nav-toggle-line {
  display: block;
  width: 1rem;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

.nav-toggle-label {
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@keyframes headerReveal {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes headerGlow {
  0%,
  100% {
    opacity: 0.55;
    transform: translateX(-1%);
  }

  50% {
    opacity: 0.9;
    transform: translateX(1%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header::before,
  .site-header.is-ready .header-inner {
    animation: none !important;
  }
}