.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(to bottom, rgba(15, 17, 21, 0.98), rgba(15, 17, 21, 0.92));
  border-bottom: 1px solid var(--color-border-subtle);
  backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-16);
  gap: var(--space-16);
}

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

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: radial-gradient(circle at 30% 30%, #ffffff 0, #c0c4cc 18%, #414852 40%, #11141b 70%);
  box-shadow: 0 0 0 2px rgba(227, 27, 35, 0.4), 0 0 18px rgba(227, 27, 35, 0.65);
  position: relative;
}

.site-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 9px 6px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--color-primary), var(--color-accent-blue));
}

.site-header__logo-text {
  font-size: var(--font-size-lg);
  color: var(--gray-50);
}

.site-header__nav {
  flex: 1 1 auto;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-24);
  list-style: none;
}

.site-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  padding-block: 4px;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-blue));
  transition: width var(--transition-normal);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--gray-50);
}

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

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}

.site-header__icon-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  color: var(--gray-100);
}

.site-header__icon-link i {
  color: var(--color-primary);
}

.site-header__icon-link:hover {
  border-color: var(--color-border-strong);
  background-color: rgba(255, 255, 255, 0.02);
}

.site-header__icon-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 var(--focus-ring-width) var(--focus-ring-color);
}

.site-header__icon-label {
  display: none;
}

.site-header__cart-link {
  padding-inline: 12px;
}

.site-header__cart-count {
  min-width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: #fff;
  font-size: var(--font-size-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 2px;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-subtle);
  color: var(--gray-100);
  cursor: pointer;
  background-color: rgba(24, 27, 34, 0.96);
}

.site-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: var(--radius-full);
  background-color: var(--gray-100);
  transition: transform var(--transition-normal), opacity var(--transition-normal), width var(--transition-normal);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 var(--focus-ring-width) var(--focus-ring-color);
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 900px) {
  .site-header__inner {
    gap: var(--space-8);
  }

  .site-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 60px;
    background: linear-gradient(to bottom, #0f1115, rgba(15, 17, 21, 0.98));
    border-bottom: 1px solid var(--color-border-subtle);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-16) var(--space-16) var(--space-16);
  }

  .site-header__nav-link {
    width: 100%;
    padding-block: 8px;
  }

  .site-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

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

  .site-header__actions {
    gap: 8px;
  }

  .site-header__icon-label {
    display: none;
  }
}

@media (min-width: 901px) {
  .site-header__nav {
    position: static;
    transform: none !important;
    opacity: 1 !important;
    visibility: visible !important;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__icon-label {
    display: inline;
  }
}

@media (max-width: 640px) {
  .site-header__logo-text {
    font-size: var(--font-size-md);
  }

  .site-header__logo-mark {
    width: 28px;
    height: 28px;
  }

  .site-header__actions {
    gap: 4px;
  }

  .site-header__icon-link {
    padding-inline: 8px;
  }
}