.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 2.75rem 1fr auto;
  align-items: center;
  min-height: var(--header-h);
  column-gap: var(--sp-3);
}

.site-header__start {
  grid-column: 1;
  display: flex;
  align-items: center;
}

.site-header__burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border-radius: var(--r-pill);
  color: var(--c-text);
  background: transparent;
  border: none;
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  transition: background var(--t-fast), color var(--t-fast);
  -webkit-tap-highlight-color: transparent;
}

.site-header__burger:hover,
.site-header__burger:focus-visible {
  background: var(--c-accent-bg);
  color: var(--c-accent-dark);
}

.site-header__burger[aria-expanded="true"] {
  background: var(--c-text);
  color: var(--c-surface);
}

.site-header__burger[aria-expanded="true"] .site-header__burger-line {
  background: var(--c-surface);
}

.site-header__burger[aria-expanded="true"] .site-header__burger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__burger[aria-expanded="true"] .site-header__burger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.site-header__burger[aria-expanded="true"] .site-header__burger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-header__burger-icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 18px;
}

.site-header__burger-line {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: var(--r-pill);
  background: currentColor;
  transition: transform var(--t-base), opacity var(--t-fast);
}

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

.site-header__logo {
  grid-column: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.site-header__logo-mark {
  display: inline-flex;
  border-radius: 1.25rem;
  overflow: hidden;
  line-height: 0;
  isolation: isolate;
  transform: translateZ(0);
}

.site-header__logo-mark--full {
  display: none;
}

.site-header__logo-img {
  display: block;
  height: auto;
  object-fit: contain;
  border-radius: 1.25rem;
}

.site-header__logo-mark--icon .site-header__logo-img--icon {
  display: block;
  width: 2.375rem;
  height: 2.375rem;
}

.site-header__logo-img--full {
  width: 2.75rem;
  height: 2.75rem;
  max-width: 2.75rem;
  max-height: 2.75rem;
  object-fit: contain;
}

.site-header__actions {
  grid-column: 3;
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
  padding: 2px;
  border-radius: var(--r-pill);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
}

.site-header__action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
  position: relative;
  transition: color var(--t-fast), background var(--t-fast);
}

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

.site-header__action:hover,
.site-header__action:focus-visible,
.site-header__action--active {
  color: var(--c-accent-dark);
  background: var(--c-surface);
}

.site-header__action-badge {
  position: absolute;
  top: 0;
  right: 0;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: var(--r-pill);
  background: var(--c-accent);
  color: var(--c-text-inverse);
  font-size: 0.6rem;
  font-weight: var(--fw-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--c-bg-alt);
}

.site-header__action-badge:empty {
  display: none;
}

.site-header__profile {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
  border: none;
  background: transparent;
  transition: color var(--t-fast), background var(--t-fast);
}

.site-header__profile:hover,
.site-header__profile:focus-visible {
  color: var(--c-accent-dark);
  background: var(--c-surface);
}

.site-header__profile--login {
  color: var(--c-text-secondary);
  background: transparent;
  border: none;
}

.site-header__profile--login:hover,
.site-header__profile--login:focus-visible {
  color: var(--c-accent-dark);
  background: var(--c-surface);
}

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

@media (min-width: 480px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
  }

  .site-header__logo-mark--icon {
    display: none;
  }

  .site-header__logo-mark--full {
    display: inline-flex;
  }

  .site-header__burger {
    width: auto;
    height: 2.75rem;
    padding-inline: var(--sp-3);
  }

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

@media (min-width: 600px) {
  .site-header__inner {
    column-gap: var(--sp-4);
  }

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

  .site-header__logo-img--full {
    width: 3rem;
    height: 3rem;
    max-width: 3rem;
    max-height: 3rem;
  }

  .site-header__logo-mark--full {
    border-radius: var(--r-xl);
  }

  .site-header__logo-mark--full .site-header__logo-img--full {
    border-radius: var(--r-xl);
  }

  .site-header__actions {
    gap: var(--sp-1);
    padding: var(--sp-1);
  }

  .site-header__action,
  .site-header__profile {
    width: auto;
    min-width: 2.5rem;
    padding-inline: var(--sp-2);
  }
}

@media (min-width: 960px) {
  .site-header__inner {
    grid-template-columns: auto auto 1fr auto;
  }

  .site-header__start {
    grid-column: 1;
  }

  .site-header__logo {
    grid-column: 2;
  }

  .site-header__actions {
    grid-column: 4;
    gap: var(--sp-2);
    padding: var(--sp-1) var(--sp-2);
    background: transparent;
    border: none;
  }

  .site-header__logo-img--full {
    width: 3rem;
    height: 3rem;
    max-width: 3rem;
    max-height: 3rem;
  }

  .site-header__logo-mark--full {
    border-radius: var(--r-xl);
  }

  .site-header__action {
    min-width: auto;
    padding: var(--sp-2) var(--sp-3);
    height: auto;
    min-height: 2.5rem;
    border-radius: var(--r-md);
  }

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

  .site-header__action-badge {
    position: static;
    border: none;
    min-width: 18px;
    height: 18px;
    font-size: 0.65rem;
  }

  .site-header__profile {
    min-width: auto;
    padding: var(--sp-2) var(--sp-3);
    height: auto;
    min-height: 2.5rem;
    border-radius: var(--r-md);
    border: 1px solid var(--c-border);
    background: var(--c-surface);
  }

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

  .site-header__profile--login {
    color: var(--c-text-inverse);
    background: var(--c-accent);
    border-color: var(--c-accent);
  }

  .site-header__profile--login:hover,
  .site-header__profile--login:focus-visible {
    color: var(--c-text-inverse);
    background: var(--c-accent-dark);
    border-color: var(--c-accent-dark);
  }
}

@media (max-width: 959px) {
  .site-header__profile-label {
    display: none;
  }
}