.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  backdrop-filter: blur(18px);
  background-color: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-nav-border);
}
.site-header__inner {
  max-width: var(--container-lg);
  margin-inline: auto;
  padding-inline: var(--space-4);
  height: var(--header-height-desktop);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
}
.site-header__brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 1.25rem;
  background: radial-gradient(circle at 0 0, var(--color-accent-gradient-start), var(--color-accent-gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-on-accent);
  box-shadow: var(--shadow-sm);
}
.site-header__brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.site-header__brand-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.site-header__brand-subtitle {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-header__nav-item {
  margin: 0;
}
.site-header__nav-link {
  position: relative;
  font-size: var(--text-sm);
  color: var(--color-text-soft);
  text-decoration: none;
  padding-block: 0.25rem;
  white-space: nowrap;
}
.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-accent-gradient-start), var(--color-accent-gradient-end));
  transition: width var(--transition-normal);
}
.site-header__nav-link:hover {
  color: var(--color-text);
}
.site-header__nav-link:hover::after,
.site-header__nav-link--active::after {
  width: 100%;
}
.site-header__nav-link--active {
  color: var(--color-text);
}
.site-header__nav-cta {
  margin-left: var(--space-4);
}
.site-header__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-subtle);
  background: rgba(255, 255, 255, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
}
.site-header__toggle:focus-visible {
  outline: 0;
  box-shadow:
    0 0 0 1px var(--color-bg),
    0 0 0 3px var(--color-focus-ring);
}
.site-header__toggle-bar {
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition:
    transform var(--transition-normal),
    opacity var(--transition-normal),
    background-color var(--transition-normal);
}
.site-header__toggle-bar + .site-header__toggle-bar {
  margin-top: 0.25rem;
}
.site-header__toggle.is-open .site-header__toggle-bar:first-child {
  transform: translateY(3px) rotate(45deg);
}
.site-header__toggle.is-open .site-header__toggle-bar:last-child {
  transform: translateY(-3px) rotate(-45deg);
}
.site-header__toggle.is-open .site-header__toggle-bar {
  background: var(--color-accent-strong);
}
@media (max-width: 1023.98px) {
  .site-header__inner {
    height: var(--header-height-mobile);
    padding-inline: var(--space-4);
  }
  .site-header__toggle {
    display: flex;
    flex-direction: column;
  }
  .site-header__nav {
    position: fixed;
    inset-inline: 0;
    top: var(--header-height-mobile);
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--color-nav-border);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    max-height: calc(100vh - var(--header-height-mobile));
    overflow-y: auto;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition:
      opacity var(--transition-normal),
      transform var(--transition-normal);
  }
  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-2);
  }
  .site-header__nav-link {
    width: 100%;
    padding-block: 0.35rem;
  }
  .site-header__nav-cta {
    margin-left: 0;
    margin-top: var(--space-2);
    width: 100%;
  }
  .site-header__nav-cta .btn {
    width: 100%;
  }
  .site-header__nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}
@media (max-width: 767.98px) {
  .site-header__inner {
    padding-inline: var(--space-4);
  }
  .site-header__brand-title {
    font-size: 0.8rem;
  }
  .site-header__brand-subtitle {
    display: none;
  }
}
@media (max-width: 479.98px) {
  .site-header__inner {
    padding-inline: var(--space-3);
  }
  .site-header__brand-mark {
    width: 2rem;
    height: 2rem;
  }
}