/* ==========================================================================
   HEADER.CSS — Sticky Navigation, Mobile Menu
   toilet-cubicle.co.uk — white chrome, petrol text, lime active indicator
   (BRAND.md §1 contrast rules: never white-on-lime; lime only as a mark/fill
   next to dark text on light surfaces; focus rings petrol.)
   ========================================================================== */

/* -------------------------------------------------------------------------
   Site Header — Sticky top bar
   ------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-grey-200);
  /* Cart badge overhangs the CTA — never clip it */
  overflow: visible;
}

/* -------------------------------------------------------------------------
   Nav Container
   ------------------------------------------------------------------------- */

.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  max-width: var(--container-max);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--sp-2);
  overflow: visible; /* keep — cart badge overhang */
}

@media (min-width: 576px) {
  .nav {
    padding-inline: var(--sp-3);
  }
}

@media (min-width: 768px) {
  .nav {
    padding-inline: var(--sp-4);
  }
}

/* -------------------------------------------------------------------------
   Brand Lockup — inline SVG mark + HTML wordmark (BRAND.md §3)
   ------------------------------------------------------------------------- */

.nav__brand {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  margin-right: auto; /* pushes links + CTA to the right */
  z-index: calc(var(--z-overlay) + 1); /* Always above mobile menu panel */
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
}

.nav__logo:hover {
  text-decoration: none;
}

.nav__logo:focus-visible {
  outline: 2px solid var(--color-petrol);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.nav__logo-mark {
  display: block;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-extrabold);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  color: var(--color-petrol-deep);
  white-space: nowrap;
}

.nav__logo-tld {
  font-weight: var(--weight-medium);
  color: var(--color-grey-400);
}

/* Endorsement line — 11px mono uppercase (BRAND.md §3) */
.nav__brand-sub {
  display: block;
  margin-top: 2px;
  padding-left: calc(32px + 0.625rem); /* aligns under the wordmark */
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-grey-600);
  white-space: nowrap;
}

.nav__brand-sub a {
  color: var(--color-petrol);
  font-weight: var(--weight-medium);
  text-decoration: none;
}

/* Light surface — petrol hover, never lime-on-white (BRAND.md §1) */
.nav__brand-sub a:hover {
  color: var(--color-petrol-dark);
  text-decoration: underline;
}

@media (max-width: 399px) {
  .nav__brand-sub {
    display: none;
  }

  .nav__logo-text {
    font-size: var(--text-base);
  }
}

/* -------------------------------------------------------------------------
   Navigation Links
   ------------------------------------------------------------------------- */

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  height: 100%;
}

.nav__item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 44px; /* touch target */
  padding: var(--sp-1) 0.75rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-petrol);
  text-decoration: none;
  border-radius: var(--radius);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-petrol-dark);
  background-color: var(--color-petrol-tint);
  text-decoration: none;
}

.nav__link:focus-visible {
  outline: 2px solid var(--color-petrol);
  outline-offset: -2px;
}

/* Active page — petrol-deep text + 2px lime underline at the bar's base.
   Lime as a mark next to dark text: allowed on white (BRAND.md §1). */
.nav__link[aria-current="page"],
.nav__link--active {
  color: var(--color-petrol-deep);
}

.nav__link[aria-current="page"]::after,
.nav__link--active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0.75rem;
  right: 0.75rem;
  height: 2px;
  background-color: var(--color-lime);
  border-radius: 2px 2px 0 0;
}

/* Dropdown arrow SVG (kept for future dropdown items) */
.nav__link-arrow {
  width: 10px;
  height: 10px;
  opacity: 0.6;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* -------------------------------------------------------------------------
   Dropdown Menus — Desktop (retained for future use; nav is currently flat)
   ------------------------------------------------------------------------- */

.nav__item--dropdown {
  position: relative;
}

.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 220px;
  padding: var(--sp-1) 0;
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-grey-200);

  /* Hidden by default */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

/* Show on hover/focus (desktop) */
.nav__item--dropdown:hover .nav__dropdown,
.nav__item--dropdown:focus-within .nav__dropdown,
.nav__item--dropdown.is-open .nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav__item--dropdown:hover .nav__link-arrow,
.nav__item--dropdown.is-open .nav__link-arrow {
  transform: rotate(180deg);
  opacity: 1;
}

.nav__dropdown-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-petrol);
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.nav__dropdown-link:hover {
  color: var(--color-petrol-dark);
  background-color: var(--color-off-white);
  text-decoration: none;
}

.nav__dropdown-link:focus-visible {
  outline: 2px solid var(--color-petrol);
  outline-offset: -2px;
}

.nav__dropdown-group {
  padding: 0;
}

.nav__dropdown-heading {
  display: block;
  padding: 0.5rem 1.25rem 0.25rem;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-grey-600);
  pointer-events: none;
}

.nav__dropdown-sub {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav__dropdown-divider {
  height: 1px;
  margin: var(--sp-1) 0;
  background-color: var(--color-grey-200);
}

/* -------------------------------------------------------------------------
   Quote CTA (right side) — petrol button, lime count badge
   ------------------------------------------------------------------------- */

.nav__cart-btn {
  position: relative;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 1.125rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-white);
  background-color: var(--color-petrol);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    box-shadow var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  overflow: visible; /* keep — the badge overhangs the corner */
  z-index: calc(var(--z-overlay) + 1); /* stays above the mobile panel */
}

.nav__cart-btn:hover {
  background-color: var(--color-petrol-dark);
  box-shadow: var(--shadow-petrol);
  text-decoration: none;
  color: var(--color-white);
}

.nav__cart-btn:focus-visible {
  outline: 2px solid var(--color-petrol);
  outline-offset: 2px;
}

/* Active page state for the CTA when viewing quote.html */
.nav__cart-btn[aria-current="page"] {
  background-color: var(--color-petrol-deep);
}

/* Count badge — lime fill, petrol-deep ink (BRAND.md §1: 5:1 ✓) */
.nav__cart-btn .badge {
  position: absolute;
  top: -7px;
  right: -9px;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: var(--weight-medium);
  line-height: 1;
  background-color: var(--color-lime);
  color: var(--color-petrol-deep);
  border: 2px solid var(--color-white);
  border-radius: var(--radius-full);
  z-index: calc(var(--z-sticky) + 1);
}

.nav__cart-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Below 480px the CTA collapses to icon + badge; the label stays in the
   accessibility tree (and the full "Get a Quote" link lives in the menu) */
@media (max-width: 479px) {
  .nav__cart-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .nav__cart-btn {
    min-width: 44px;
    padding: 0 0.75rem;
  }
}

/* -------------------------------------------------------------------------
   Mobile Menu Toggle (Hamburger)
   Hidden on desktop, visible below 1024px
   ------------------------------------------------------------------------- */

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  order: 99; /* visually right-most; DOM order keeps it before the menu */
  z-index: calc(var(--z-overlay) + 1);
}

.nav__toggle:focus-visible {
  outline: 2px solid var(--color-petrol);
  outline-offset: 2px;
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-petrol-deep);
  border-radius: 2px;
  transition:
    transform var(--transition-base),
    opacity var(--transition-fast);
}

.nav__toggle-bar + .nav__toggle-bar {
  margin-top: 5px;
}

/* Animate to X when open */
.nav--open .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav--open .nav__toggle-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav--open .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* -------------------------------------------------------------------------
   Mobile Navigation — Below 1024px (matches DESKTOP_BP in js/nav.js)
   Full-height slide-in panel from the right
   ------------------------------------------------------------------------- */

@media (max-width: 1023px) {
  .nav__toggle {
    display: flex;
  }

  .nav__list {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 320px;
    height: 100vh;
    height: 100dvh;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: calc(var(--header-height) + var(--sp-3)) var(--sp-3) var(--sp-3);
    background-color: var(--color-white);
    border-left: 1px solid var(--color-grey-200);
    overflow-y: auto;
    transform: translateX(100%);
    /* visibility keeps the closed panel out of the tab order */
    visibility: hidden;
    transition:
      transform 0.35s var(--ease-out),
      visibility 0.35s var(--ease-out);
    box-shadow: -8px 0 24px rgba(14, 46, 52, 0.18);
    z-index: var(--z-overlay);
  }

  .nav--open .nav__list {
    transform: translateX(0);
    visibility: visible;
  }

  .nav__item {
    height: auto;
    flex-direction: column;
    align-items: stretch;
  }

  .nav__link {
    min-height: 48px;
    padding: 0.875rem var(--sp-1);
    font-size: var(--text-md);
    color: var(--color-petrol-deep);
    border-bottom: 1px solid var(--color-grey-100);
    border-radius: 0;
  }

  .nav__link:hover {
    background-color: var(--color-off-white);
  }

  /* Active page in the panel — 3px lime inset bar instead of underline */
  .nav__link[aria-current="page"]::after,
  .nav__link--active::after {
    display: none;
  }

  .nav__link[aria-current="page"],
  .nav__link--active {
    border-left: 3px solid var(--color-lime);
    padding-left: calc(var(--sp-1) + var(--sp-1));
    background-color: var(--color-off-white);
  }

  /* Mobile dropdown — simple expand/collapse, no absolute positioning */
  .nav__dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    min-width: auto;
    background-color: transparent;
    border: none;
    box-shadow: none;
    border-radius: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav__item--dropdown.is-open .nav__dropdown {
    max-height: 400px;
  }

  .nav__dropdown-link {
    min-height: 44px;
    padding: 0.625rem var(--sp-1) 0.625rem var(--sp-3);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-grey-100);
  }

  .nav__dropdown-heading {
    padding: 0.5rem 0 0.25rem var(--sp-2);
  }

  .nav__dropdown-sub .nav__dropdown-link {
    padding-left: calc(var(--sp-3) + var(--sp-1));
  }

  .nav__dropdown-divider {
    margin: var(--sp-1) var(--sp-2);
  }

  /* Backdrop overlay behind the panel — injected by js/nav.js */
  .nav__backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background-color: rgba(14, 46, 52, 0.5); /* petrol-deep scrim */
    z-index: calc(var(--z-overlay) - 1);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition-base),
      visibility var(--transition-base);
  }

  .nav--open .nav__backdrop {
    opacity: 1;
    visibility: visible;
  }
}

/* Desktop — backdrop and menu-only items hidden */
@media (min-width: 1024px) {
  .nav__backdrop {
    display: none !important;
  }

  .nav__item--mobile-only {
    display: none;
  }
}

/* Narrow desktop — tighten spacing so all seven items fit at 1024–1180px
   (nav labels are kept short — "Cubicles", "IPS Panels" — so the seven-item
   bar clears the 1024px breakpoint with room to spare) */
@media (min-width: 1024px) and (max-width: 1180px) {
  .nav {
    gap: var(--sp-1);
  }

  .nav__link {
    padding-inline: 0.5rem;
  }

  .nav__link[aria-current="page"]::after,
  .nav__link--active::after {
    left: 0.5rem;
    right: 0.5rem;
  }

  .nav__cart-btn {
    padding: 0 0.875rem;
  }
}

/* -------------------------------------------------------------------------
   Header — scrolled state (optional JS-toggled class)
   ------------------------------------------------------------------------- */

.site-header--scrolled {
  box-shadow: var(--shadow-md);
}