/* Shared primary navigation — homepage + subpages */
:root {
  --site-header-max: 1200px;
}

.site-header-shell {
  position: relative;
  z-index: 20;
  max-width: var(--site-header-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border, rgba(0, 229, 255, 0.12));
}

.site-header .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  color: inherit;
  text-decoration: none;
}

.site-header .brand:hover {
  opacity: 0.9;
  text-decoration: none;
}

.site-header .brand-mark {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
}

.site-header .brand-name {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.site-header .brand-sub {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.65rem;
  color: var(--text-dim, #5a7a99);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-nav {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.site-nav-list {
  display: flex;
  align-items: center;
  gap: 1.05rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav-list--mobile {
  display: none;
}

.site-nav-item {
  position: relative;
  margin: 0;
  padding: 0;
}

/* Invisible bridge so moving to the panel does not break :hover */
.site-nav-item--group::after {
  content: "";
  position: absolute;
  left: -0.35rem;
  right: -0.35rem;
  top: 100%;
  height: 0.65rem;
  z-index: 29;
}

.site-nav a,
.site-nav-trigger {
  color: var(--text-muted, #8aaabb);
  text-decoration: none;
  transition: color 0.2s, opacity 0.2s, border-color 0.2s;
  white-space: nowrap;
  padding: 0.25rem 0.2rem;
}

.site-nav a:hover,
.site-nav-trigger:hover,
.site-nav-item--group:hover > .site-nav-trigger,
.site-nav-item--group:focus-within > .site-nav-trigger,
.site-nav-item--group.is-open > .site-nav-trigger {
  color: var(--accent, #00e5ff);
  opacity: 1;
}

.site-nav a.is-active,
.site-nav-trigger.is-active {
  color: var(--accent, #00e5ff);
}

.site-nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0;
  border: none;
  background: transparent;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  cursor: pointer;
}

.site-nav-chevron {
  display: inline-block;
  width: 0.35rem;
  height: 0.35rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0.7;
  transition: transform 0.2s;
}

.site-nav-item--group:hover .site-nav-chevron,
.site-nav-item--group:focus-within .site-nav-chevron,
.site-nav-item--group.is-open .site-nav-chevron {
  transform: rotate(225deg) translateY(1px);
}

.site-nav-dropdown {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 50%;
  transform: translateX(-50%);
  min-width: 13.5rem;
  padding: 0.55rem 0;
  border: 1px solid var(--border, rgba(0, 229, 255, 0.12));
  border-radius: 8px;
  background: var(--bg-elevated, #0a1220);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.12s ease 0.28s,
    visibility 0s linear 0.36s,
    pointer-events 0s linear 0.36s;
  z-index: 30;
}

.site-nav-dropdown-kicker {
  margin: 0 0 0.35rem;
  padding: 0 0.85rem;
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  color: var(--text-dim, #5a7a99);
}

.site-nav-dropdown-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav-dropdown-list a {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: 0.66rem;
  line-height: 1.35;
  white-space: normal;
}

.site-nav-dropdown-list a:hover {
  background: rgba(0, 229, 255, 0.06);
}

.site-nav-item--group:hover .site-nav-dropdown,
.site-nav-item--group:focus-within .site-nav-dropdown,
.site-nav-item--group.is-open .site-nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition:
    opacity 0.12s ease 0s,
    visibility 0s linear 0s,
    pointer-events 0s linear 0s;
}

.site-nav-toggle {
  display: none;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border, rgba(0, 229, 255, 0.12));
  border-radius: 6px;
  background: var(--bg-panel, #0d1420);
  color: var(--text-muted, #8aaabb);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav-toggle:hover,
.site-nav-toggle[aria-expanded="true"] {
  color: var(--accent, #00e5ff);
  border-color: var(--accent-dim, rgba(0, 229, 255, 0.15));
}

.site-nav-toggle-icon {
  display: block;
  width: 0.9rem;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -4px 0 currentColor, 0 4px 0 currentColor;
}

@media (max-width: 1100px) {
  .site-nav-list--desktop {
    gap: 0.75rem;
    font-size: 0.64rem;
  }
}

@media (max-width: 960px) {
  .site-header {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .site-header .brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .site-nav-toggle {
    display: inline-flex;
    flex: 0 0 auto;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    flex-basis: 100%;
    padding: 0.35rem 0;
    border: 1px solid var(--border, rgba(0, 229, 255, 0.12));
    border-radius: 8px;
    background: var(--bg-elevated, #0a1220);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav-list--desktop {
    display: none;
  }

  .site-nav-list--mobile {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav-mobile-leaf > a,
  .site-nav-mobile-subitem > a {
    display: block;
    padding: 0.7rem 1rem;
    border-top: 1px solid var(--border, rgba(0, 229, 255, 0.12));
  }

  .site-nav-mobile-leaf:first-child > a {
    border-top: none;
  }

  .site-nav-mobile-group {
    border-top: 1px solid var(--border, rgba(0, 229, 255, 0.12));
  }

  .site-nav-mobile-label {
    margin: 0;
    padding: 0.65rem 1rem 0.25rem;
    font-size: 0.68rem;
    color: var(--text-muted, #8aaabb);
  }

  .site-nav-mobile-label.is-active {
    color: var(--accent, #00e5ff);
  }

  .site-nav-mobile-kicker {
    margin: 0;
    padding: 0 1rem 0.35rem;
    font-size: 0.58rem;
    letter-spacing: 0.12em;
    color: var(--text-dim, #5a7a99);
    text-transform: uppercase;
  }

  .site-nav-mobile-sub {
    margin: 0;
    padding: 0 0 0.25rem;
    list-style: none;
  }

  .site-nav-mobile-subitem > a {
    padding-left: 1.35rem;
    font-size: 0.66rem;
  }
}