.sh-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-xs);
}

.sh-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);
}

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

.sh-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.sh-header__logo:hover {
  color: var(--color-primary-strong);
  text-decoration: none;
}

.sh-header__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 20%, var(--color-primary) 0%, var(--color-primary-strong) 70%);
  color: #fff;
  box-shadow: var(--shadow-sm);
  font-size: 1.1rem;
}

.sh-header__logo-text {
  font-size: 1.1rem;
}

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

.sh-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.sh-header__nav-item {
  list-style: none;
}

.sh-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.sh-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.2rem;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-primary-soft);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-fast);
}

.sh-header__nav-link:hover {
  color: var(--color-primary-strong);
  background-color: rgba(224, 122, 43, 0.06);
}

.sh-header__nav-link:hover::after {
  transform: scaleX(1);
}

.sh-header__nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sh-header__nav-item--accent .sh-header__nav-link--button {
  padding-inline: 1rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-strong) 100%);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.sh-header__nav-item--accent .sh-header__nav-link--button::after {
  display: none;
}

.sh-header__nav-item--accent .sh-header__nav-link--button:hover {
  box-shadow: var(--shadow-md);
}

.sh-header__nav-icon {
  display: inline-flex;
  align-items: center;
}

/* Mobile toggle */
.sh-header__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-200);
  background-color: var(--color-surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.sh-header__toggle:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.sh-header__toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sh-header__toggle-icon,
.sh-header__toggle-icon::before,
.sh-header__toggle-icon::after {
  display: block;
  position: absolute;
  width: 1.3rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transition:
    transform var(--transition-normal),
    opacity var(--transition-fast),
    background-color var(--transition-fast);
}

.sh-header__toggle-icon::before,
.sh-header__toggle-icon::after {
  content: "";
}

.sh-header__toggle-icon::before {
  transform: translateY(-6px);
}

.sh-header__toggle-icon::after {
  transform: translateY(6px);
}

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

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

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

/* Responsive layout */
@media (max-width: 768px) {
  .sh-header__toggle {
    display: inline-flex;
  }

  .sh-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-subtle);
    box-shadow: var(--shadow-sm);
    transform-origin: top;
  }

  .sh-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2) var(--space-4) var(--space-4);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-4px);
    transition:
      max-height var(--transition-slow),
      opacity var(--transition-normal),
      transform var(--transition-normal);
  }

  .sh-header__nav--open .sh-header__nav-list {
    max-height: 480px;
    opacity: 1;
    transform: translateY(0);
  }

  .sh-header__nav-link {
    padding-block: 0.7rem;
    width: 100%;
  }

  .sh-header__nav-link::after {
    display: none;
  }

  .sh-header__nav-item--accent .sh-header__nav-link--button {
    justify-content: center;
  }
}

@media (min-width: 769px) {
  .sh-header__nav-list {
    max-height: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}