.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(180deg, rgba(15, 23, 34, 0.98), rgba(15, 23, 34, 0.96));
  border-bottom: 1px solid rgba(51, 65, 85, 0.9);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

.site-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.site-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: conic-gradient(from 210deg, var(--color-accent-sandstone), var(--color-accent-green), var(--color-accent-copper), var(--color-primary));
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9), 0 10px 25px rgba(0, 0, 0, 0.6);
  position: relative;
}

.site-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 9px;
  background: radial-gradient(circle at 20% 10%, rgba(226, 232, 240, 0.1), transparent 55%),
    linear-gradient(145deg, #020617, #020617 60%, #020617 100%);
}

.site-header__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.site-header__title {
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--color-neutral-50);
}

.site-header__subtitle {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-header__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  color: var(--color-neutral-100);
  background-color: rgba(15, 23, 42, 0.96);
}

.site-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__nav {
  margin-left: auto;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-header__nav-link {
  position: relative;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-neutral-200);
  padding: 0.25rem 0;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent-copper));
  transition: width var(--transition-fast);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  width: 100%;
}

.site-header__nav-link--btn {
  padding: 0.5rem 1.05rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: radial-gradient(circle at top left, rgba(31, 79, 122, 0.6), transparent 55%),
    linear-gradient(135deg, #020617, #020617 70%, #020617 100%);
  box-shadow: var(--shadow-xs);
}

.site-header__nav-link--btn::after {
  display: none;
}

.site-header__nav-link--btn:hover {
  border-color: var(--color-accent-sandstone);
  color: var(--color-neutral-50);
  box-shadow: var(--shadow-sm);
}

.site-header__nav-item--cta {
  margin-left: var(--space-2);
}

@media (max-width: 960px) {
  .site-header__subtitle {
    display: none;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 60px;
    background: radial-gradient(circle at top, rgba(31, 79, 122, 0.5), transparent 55%),
      linear-gradient(180deg, #020617, #020617 70%, #020617 100%);
    border-top: 1px solid rgba(51, 65, 85, 0.9);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height var(--transition-normal), opacity var(--transition-fast), visibility var(--transition-fast);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
    gap: var(--space-3);
  }

  .site-header__nav-link {
    font-size: 0.9rem;
  }

  .site-header__nav-open .site-header__nav {
    max-height: 340px;
    opacity: 1;
    visibility: visible;
  }

  .site-header__nav-open .site-header__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .site-header__nav-open .site-header__toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .site-header__nav-open .site-header__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-bar {
    transition: none;
  }
}