.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: var(--glass-background);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

/* Reserve space for fixed header */
body {
  padding-top: calc(3.25rem + (var(--space-s) * 2));
}

html[data-theme="light"] .site-header,
html[data-theme="system"] .site-header {
  box-shadow: 0 10px 30px rgba(17, 17, 17, 0.08);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
  padding-block: var(--space-s);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-s);
  text-decoration: none;
  color: inherit;
  font-weight: 600;
}

.site-brand img {
  width: 3.25rem;
  height: auto;
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-s), 3vw, var(--space-xl));
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-s), 1.25vw, var(--space-l));
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding-block: var(--space-2xs);
  font-weight: 500;
  color: var(--color-muted);
  transition: color var(--transition-base);
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link[aria-current] {
  color: var(--color-text);
}

.site-nav__link[aria-current]::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.4rem;
  height: 0.2rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-strong));
}

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-s);
}

.site-nav__button,
.site-nav__search-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  cursor: pointer;
  transition: transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.site-nav__button:hover,
.site-nav__button:focus-visible,
.site-nav__search-trigger:hover,
.site-nav__search-trigger:focus-visible {
  transform: translateY(-1px);
  border-color: var(--glass-border);
  background-color: var(--color-surface);
}

.site-nav__button::before {
  content: "";
  width: 1.35rem;
  height: 1.35rem;
  background-image: var(--theme-icon);
  background-position: center;
  background-repeat: no-repeat;
}

.site-nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--color-surface);
  color: inherit;
  cursor: pointer;
}

.site-nav__toggle-icon {
  width: 1.4rem;
  height: 1.4rem;
  display: block;
}

.site-nav__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.search-shortcut {
  font-size: 0.75rem;
  opacity: 0.6;
  border: 1px solid var(--glass-border);
  border-radius: 0.35rem;
  padding: 0.1rem 0.4rem;
  margin-left: var(--space-2xs);
}

.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: var(--space-l);
  background: rgba(15, 15, 15, 0.7);
  backdrop-filter: blur(18px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.search-overlay.is-visible {
  opacity: 1;
  pointer-events: all;
}

.search-dialog {
  width: min(48rem, 100%);
  max-height: min(32rem, 90vh);
  display: flex;
  flex-direction: column;
  background: var(--glass-background);
  border-radius: var(--radius-l);
  border: 1px solid var(--glass-border);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.35);
}

.search-bar {
  position: relative;
  padding: var(--space-m) var(--space-l);
  border-bottom: 1px solid var(--glass-border);
  display: grid;
  gap: var(--space-xs);
}

.search-input {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-m);
  border: 1px solid var(--glass-border);
  background: var(--color-surface);
  color: inherit;
  font-size: 1rem;
}

.search-results {
  list-style: none;
  margin: 0;
  padding: var(--space-m) var(--space-l);
  display: grid;
  gap: var(--space-m);
  overflow-y: auto;
}

.search-result {
  display: grid;
  gap: var(--space-2xs);
  padding: var(--space-m);
  border-radius: var(--radius-m);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color var(--transition-base), background-color var(--transition-base);
}

.search-result:hover,
.search-result:focus-within {
  border-color: var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
}

.search-result__title {
  font-weight: 600;
  color: var(--color-text);
}

.search-result__description {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.search-empty {
  padding: var(--space-l);
  color: var(--color-muted);
  text-align: center;
}

@media (max-width: 60rem) {
  .site-nav__toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + var(--space-s));
    right: 0;
    width: min(20rem, 90vw);
    padding: var(--space-l);
    border-radius: var(--radius-l);
    border: 1px solid var(--glass-border);
    background: var(--glass-background);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-l);
    opacity: 0;
    transform: translateY(-0.5rem);
    pointer-events: none;
    transition: opacity 160ms ease, transform 160ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
  }

  .site-nav__links {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav__link {
    padding-block: var(--space-xs);
  }

  .site-nav__actions {
    justify-content: flex-start;
  }
}

@media (max-width: 40rem) {
  /* Smaller header on small screens; adjust offset */
  body {
    padding-top: calc(2.75rem + (var(--space-2xs) * 2));
  }
  .site-header__inner {
    padding-block: var(--space-2xs);
  }

  .site-brand img {
    width: 2.75rem;
  }
}