/* Header layout and brand */
.shell-header {
  backdrop-filter: blur(18px);
}

.shell-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

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

.shell-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}

.shell-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  position: relative;
  background: radial-gradient(circle at 30% 20%, var(--color-primary-soft), var(--color-primary));
}

.shell-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.shell-header__logo-text {
  font-weight: 500;
}

/* Navigation */
.shell-header__nav {
  display: flex;
}

.shell-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.shell-header__nav-link {
  position: relative;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
}

.shell-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 1px;
  transform-origin: center;
  transform: scaleX(0);
  background: var(--color-primary);
  transition: transform var(--transition-normal);
}

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

.shell-header__nav-link:hover::after,
.shell-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.shell-header__nav-item--cta .shell-header__nav-link--cta {
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-strong);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--color-text);
}

.shell-header__nav-item--cta .shell-header__nav-link--cta::after {
  display: none;
}

.shell-header__nav-item--cta .shell-header__nav-link--cta:hover,
.shell-header__nav-item--cta .shell-header__nav-link--cta:focus-visible {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: transparent;
}

/* Mobile menu toggle */
.shell-header__menu-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(255, 255, 255, 0.9);
}

.shell-header__menu-toggle-label {
  font-size: var(--font-size-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.shell-header__menu-toggle-icon {
  width: 18px;
  height: 14px;
  position: relative;
}

.shell-header__menu-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transform-origin: center;
  transition: transform var(--transition-fast), opacity var(--transition-fast), top var(--transition-fast), bottom var(--transition-fast);
}

.shell-header__menu-line:first-child {
  top: 2px;
}

.shell-header__menu-line:last-child {
  bottom: 2px;
}

/* Open state */
.shell-header__menu-toggle[aria-expanded="true"] .shell-header__menu-line:first-child {
  top: 6px;
  transform: rotate(45deg);
}

.shell-header__menu-toggle[aria-expanded="true"] .shell-header__menu-line:last-child {
  bottom: 6px;
  transform: rotate(-45deg);
}

.shell-header__menu-toggle[aria-expanded="true"] .shell-header__menu-toggle-label::after {
  content: "";
}

/* Responsive behavior */
@media (max-width: 768px) {
  .shell-header__menu-toggle {
    display: inline-flex;
  }

  .shell-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: rgba(245, 241, 236, 0.98);
    border-bottom: 1px solid var(--color-border-subtle);
    transform-origin: top;
    transform: scaleY(1);
  }

  .shell-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-3) var(--space-4) var(--space-4)!important;
    gap: 0.75rem;
  }

  .shell-header__nav-item--cta {
    margin-top: 0.5rem;
    width: 100%;
  }

  .shell-header__nav-item--cta .shell-header__nav-link--cta {
    width: 100%;
    text-align: center;
  }

  /* JS-enhanced collapsed state */
  .shell-header--collapsed .shell-header__nav {
    display: none;
  }

  .shell-header--expanded .shell-header__nav {
    display: block;
  }
}

@media (min-width: 769px) {
  .shell-header__nav {
    position: static;
  }
}