/* Header layout */
.ke-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.ke-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);
}

/* Branding */
.ke-header__brand {
  display: flex;
  align-items: center;
}

.ke-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--font-size-lg);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.ke-header__logo-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.ke-header__logo-mark i {
  font-size: 1.1rem;
}

.ke-header__logo-text {
  font-family: var(--font-sans);
}

/* Navigation */
.ke-header__nav {
  flex: 1 1 auto;
}

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

.ke-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.25rem 0;
}

.ke-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: width var(--transition-normal);
}

.ke-header__nav-link:hover,
.ke-header__nav-link:focus-visible {
  color: var(--color-text);
}

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

/* Actions */
.ke-header__actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.ke-header__icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 9999px;
  border: 1px solid var(--gray-200);
  background-color: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.ke-header__icon-link:hover,
.ke-header__icon-link:focus-visible {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.ke-header__cta {
  margin-left: var(--space-2);
}

/* Mobile toggle */
.ke-header__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 9999px;
  border: 1px solid var(--gray-200);
  background-color: var(--color-surface);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.ke-header__toggle-bar {
  position: absolute;
  width: 1.3rem;
  height: 2px;
  border-radius: 9999px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.ke-header__toggle-bar:nth-child(1) {
  transform: translateY(-6px);
}

.ke-header__toggle-bar:nth-child(2) {
  transform: translateY(0);
}

.ke-header__toggle-bar:nth-child(3) {
  transform: translateY(6px);
}

.ke-header__toggle[aria-expanded="true"] .ke-header__toggle-bar:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.ke-header__toggle[aria-expanded="true"] .ke-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.ke-header__toggle[aria-expanded="true"] .ke-header__toggle-bar:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* Responsive */
@media (max-width: 960px) {
  .ke-header__inner {
    gap: var(--space-2);
  }

  .ke-header__nav-list {
    gap: var(--space-3);
  }

  .ke-header__cta {
    display: none;
  }
}

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

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

  .ke-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--gray-200);
    transform-origin: top;
    transform: scaleY(0.95);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition:
      opacity var(--transition-normal),
      transform var(--transition-normal),
      visibility var(--transition-normal);
  }

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

  .ke-header__nav-item {
    width: 100%;
  }

  .ke-header__nav-link {
    display: block;
    width: 100%;
    padding: 0.4rem 0;
  }

  .ke-header__nav--open {
    opacity: 1;
    transform: scaleY(1);
    pointer-events: auto;
    visibility: visible;
  }

  .ke-header__actions {
    gap: var(--space-1);
  }
}

@media (max-width: 480px) {
  .ke-header__logo-text {
    font-size: var(--font-size-md);
  }

  .ke-header__icon-link {
    width: 2rem;
    height: 2rem;
  }
}