.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-accent-tertiary);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container-standard);
  margin-inline: auto;
  padding-inline: var(--container-pad-mobile);
  min-height: 64px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
  flex-shrink: 0;
}

.site-header__brand:hover {
  text-decoration: none;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-accent-tertiary);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-ink);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: rgba(var(--color-ink-rgb), 0.05);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.site-header__toggle-icon {
  position: relative;
  width: 20px;
  height: 2px;
  background-color: currentColor;
  transition: background-color var(--transition-fast);
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-fast);
}

.site-header__toggle-icon::before {
  top: -6px;
}

.site-header__toggle-icon::after {
  top: 6px;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon {
  background-color: transparent;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::before {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

.site-header__nav {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  justify-content: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-item {
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-2) 0;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--color-accent-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-primary);
}

.site-header__nav-link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

.site-header__play-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  min-height: 44px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  line-height: 1.2;
  text-decoration: none;
  background-color: var(--color-accent-primary);
  color: var(--color-white);
  border: 1px solid var(--color-accent-primary);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-header__play-btn:hover {
  background-color: var(--color-accent-primary-dark);
  border-color: var(--color-accent-primary-dark);
  text-decoration: none;
}

.site-header__play-btn:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.site-header__play-icon {
  flex-shrink: 0;
}

@media (max-width: 1023px) {
  .site-header__inner {
    flex-wrap: wrap;
    min-height: 56px;
    padding-block: var(--space-2);
  }

  .site-header__brand {
    order: 1;
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__brand-text {
    font-size: 1.125rem;
  }

  .site-header__toggle {
    display: inline-flex;
    order: 3;
    margin-left: auto;
  }

  .site-header__play-btn {
    order: 2;
    margin-left: auto;
  }

  .site-header__nav {
    order: 4;
    flex-basis: 100%;
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-accent-tertiary);
    box-shadow: var(--shadow-elevated);
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    z-index: 99;
  }

  .site-header__nav.is-open {
    display: block;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3);
  }

  .site-header__nav-item {
    border-bottom: 1px solid var(--border-divider);
  }

  .site-header__nav-item:last-child {
    border-bottom: none;
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-3) var(--space-2);
    font-size: var(--text-md);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    min-height: 72px;
  }

  .site-header__nav {
    justify-content: center;
  }

  .site-header__nav-list {
    gap: var(--space-5);
  }
}