/* ==========================================================================
   HEADER.CSS — Sticky Navigation, Dropdowns, Mobile Menu
   toilet-cubicle.co.uk
   ========================================================================== */

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

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background-color: var(--color-charcoal);
  /* Subtle bottom edge definition */
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
}

/* Fine green accent line along the very top */
.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--color-green-dark),
    var(--color-green),
    var(--color-green-light),
    var(--color-green)
  );
  z-index: 1;
}

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--sp-2);
}

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

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

/* -------------------------------------------------------------------------
   Logo
   ------------------------------------------------------------------------- */

.nav__brand {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: calc(var(--z-overlay) + 1); /* Always above mobile menu */
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex-shrink: 0;
  text-decoration: none;
  color: var(--color-white);
}

.nav__logo img {
  height: 32px;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-white);
  letter-spacing: var(--tracking-tight);
  white-space: nowrap;
}

.nav__logo-text span {
  color: var(--color-green-light);
}

/* -------------------------------------------------------------------------
   Desktop 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;
  padding: var(--sp-1) 0.75rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: rgba(255, 255, 255, 0.85);
  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-white);
  background-color: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav__link--active {
  color: var(--color-white);
}

/* Active underline indicator */
.nav__link--active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0.75rem;
  right: 0.75rem;
  height: 2px;
  background-color: var(--color-green);
  border-radius: 2px 2px 0 0;
}

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

/* -------------------------------------------------------------------------
   Dropdown Menus — Desktop
   ------------------------------------------------------------------------- */

.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-charcoal-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.06);

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

/* Tiny arrow pointer at top */
.nav__dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 6px;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  background-color: var(--color-charcoal-light);
}

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

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

.nav__dropdown-link {
  display: block;
  padding: 0.625rem 1.25rem;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    padding-left var(--transition-fast);
}

.nav__dropdown-link:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.06);
  padding-left: 1.5rem;
  text-decoration: none;
}

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

/* -------------------------------------------------------------------------
   Nav Actions (right side — cart button, etc.)
   ------------------------------------------------------------------------- */

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  z-index: calc(var(--z-overlay) + 1); /* Above mobile menu */
}

/* -- Cart Button ---------------------------------------------------------- */

.nav__cart-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 40px;
  padding: 0 1rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-white);
  background-color: var(--color-green);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    box-shadow var(--transition-fast);
  text-decoration: none;
}

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

.nav__cart-btn .badge {
  position: absolute;
  top: -6px;
  right: -6px;
  font-size: 0.625rem;
  min-width: 18px;
  height: 18px;
  background-color: var(--color-white);
  color: var(--color-green);
  border: 2px solid var(--color-green);
}

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

/* -------------------------------------------------------------------------
   Mobile Menu Toggle (Hamburger)
   Hidden on desktop, visible below 768px
   ------------------------------------------------------------------------- */

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  z-index: calc(var(--z-overlay) + 1);
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  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 768px
   Full-height slide-in panel from right
   ------------------------------------------------------------------------- */

@media (max-width: 767px) {
  .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-charcoal);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease-out);
    box-shadow: -8px 0 24px rgba(0, 0, 0, 0.3);
    z-index: var(--z-overlay);
  }

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

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

  .nav__link {
    padding: 0.875rem 0;
    font-size: var(--text-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0;
  }

  .nav__link--active::after {
    display: none;
  }

  /* Mobile dropdown — simple toggle, 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__dropdown::before {
    display: none;
  }

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

  .nav__dropdown-link {
    padding: 0.625rem 0 0.625rem var(--sp-2);
    font-size: var(--text-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  /* Backdrop overlay behind mobile menu */
  .nav__backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    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 — ensure backdrop is always hidden */
@media (min-width: 768px) {
  .nav__backdrop {
    display: none !important;
  }
}

/* -------------------------------------------------------------------------
   Header — scrolled state (optional JS-toggled class)
   Adds tighter shadow when page has scrolled
   ------------------------------------------------------------------------- */

.site-header--scrolled {
  box-shadow:
    0 1px 0 rgba(0, 0, 0, 0.2),
    0 4px 12px rgba(0, 0, 0, 0.15);
}

/* -- Brand subtitle (Paneltech) ------------------------------------------- */

.nav__brand-sub {
  display: block;
  font-size: 10px;
  font-weight: var(--weight-medium);
  color: var(--color-grey-400);
  letter-spacing: var(--tracking-wide);
  margin-top: 2px;
}

.nav__brand-sub a {
  color: var(--color-green);
  text-decoration: none;
}

.nav__brand-sub a:hover {
  text-decoration: underline;
}