/**
 * A.R.C Technology — Header v7.0
 * "Resilient Orbit" light-first — frosted off-white bar, navy nav, mega menu
 * Selectors match HTML: .nav, .nav__link, .hamburger, .mobile-menu, .mega-menu
 */

/* ===========================
   HEADER BASE
   Uses --chrome-* tokens (variables.css) — same stack as .breadcrumb-bar.
   =========================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid rgba(10, 37, 64, 0.08);
  background-color: transparent;
  background-image: var(--chrome-radial-glow), var(--chrome-tint);
  background-attachment: fixed, scroll;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: box-shadow var(--transition-base) var(--ease-smooth);
}

.header--scrolled {
  background-image: var(--chrome-radial-glow), var(--chrome-tint-scrolled);
  background-attachment: fixed, scroll;
  box-shadow: 0 4px 24px rgba(10, 37, 64, 0.12);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ===========================
   LOGO
   =========================== */
.header__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
  min-width: min-content;
}

/* <picture> is the flex item of .header__logo — keep it from shrinking (img’s flex-shrink does nothing here) */
.header__logo picture {
  display: block;
  flex-shrink: 0;
  line-height: 0;
  max-width: none;
}

.header__logo-img {
  display: block;
  width: auto;
  height: clamp(34px, 4.5vw, 44px);
  max-height: calc(var(--header-height) - 1rem);
  max-width: min(220px, 70vw);
  aspect-ratio: 150 / 42;
  object-fit: contain;
  object-position: left center;
  transition: transform var(--transition-base) var(--ease-bounce);
}
.header__logo:hover .header__logo-img {
  transform: scale(1.08);
}

/* ===========================
   DESKTOP NAV
   =========================== */
.nav { display: flex; align-items: center; }
.nav__list { display: flex; align-items: center; gap: 2.5rem; }
.nav__item { position: static; }

.nav__link {
  font-size: var(--fs-sm);
  font-weight: var(--font-medium);
  color: var(--color-navy);
  text-decoration: none;
  transition: color var(--transition-fast) ease;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0;
}

.nav__link:hover,
.nav__link--active,
.nav__link[aria-current="page"] {
  color: var(--color-on-light-teal);
}

/* Animated teal underline */
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-teal-a11y);
  border-radius: var(--radius-full);
  transition: width var(--transition-base) var(--ease-bounce);
}

.nav__link:hover::after,
.nav__link--active::after,
.nav__link[aria-current="page"]::after {
  width: 100%;
}

/* Chevron on Services dropdown trigger */
.nav__chevron {
  width: 14px; height: 14px;
  transition: transform var(--transition-base) var(--ease-bounce);
  flex-shrink: 0;
}

.nav__trigger[aria-expanded="true"] .nav__chevron {
  transform: rotate(180deg);
}

/* ===========================
   HEADER CTA (desktop)
   =========================== */
.header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ===========================
   MEGA MENU
   =========================== */
.mega-menu {
  position: fixed;
  top: calc(var(--header-height) - 8px);
  left: 0;
  right: 0;
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 2px solid var(--color-teal-a11y);
  box-shadow: 0 20px 50px rgba(10, 37, 64, 0.14);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: 2rem 0;
  padding-top: calc(2rem + 8px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base) var(--ease-smooth),
              transform var(--transition-base) var(--ease-smooth),
              visibility var(--transition-base);
  z-index: 200;
}

/* Invisible hit bridge: pointer path from nav trigger into panel (no dead zone) */
.mega-menu::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 100%;
  height: 14px;
  pointer-events: auto;
}

/* Show on hover OR when JS sets aria-expanded OR .is-open */
.nav__item--mega:hover .mega-menu,
.nav__item--mega:focus-within .mega-menu,
.nav__trigger[aria-expanded="true"] + .mega-menu,
.mega-menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

/* After click-dismiss: block pure :hover from reopening until pointer leaves (navigation.js) */
.nav__item--mega.nav__item--mega--suppress-hover:hover .mega-menu:not(.is-open) {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px);
}

/* 3-column inner grid (.container handles width + horizontal padding) */
.mega-menu__inner {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

@media (min-width: 1024px) and (max-width: 1200px) {
  .mega-menu__inner {
    gap: var(--space-4);
  }
}

/* Column */
.mega-menu__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 0;
}

/* Column header — icon + title + subtitle */
.mega-menu__col-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(10, 37, 64, 0.08);
  margin-bottom: 0.25rem;
}

.mega-menu__col-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  background: var(--color-teal-subtle);
  color: var(--color-teal);
}

.mega-menu__col-icon--healthcare { background: var(--color-teal-subtle); color: var(--color-on-light-teal); }
.mega-menu__col-icon--general { background: var(--color-coral-subtle); color: var(--color-on-light-coral-deep); }
.mega-menu__col-icon--web { background: var(--color-yellow-subtle); color: var(--color-on-light-yellow); }

.mega-menu__col-meta { display: flex; flex-direction: column; gap: 2px; }

.mega-menu__col-title {
  font-family: var(--font-display);
  font-weight: var(--font-bold);
  font-size: var(--fs-sm);
  color: var(--color-navy);
  text-decoration: none;
  transition: color var(--transition-fast) ease;
}
.mega-menu__col-title:hover { color: var(--color-on-light-teal); }

.mega-menu__col-sub {
  font-size: var(--fs-xs);
  color: rgba(10, 37, 64, 0.55);
}

/* Link list */
.mega-menu__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Individual mega menu item */
.mega-menu__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast) ease;
}

.mega-menu__item:hover {
  background: var(--color-teal-subtle);
}

.mega-menu__item-icon {
  width: 18px; height: 18px;
  flex-shrink: 0;
  color: var(--color-on-light-teal);
  opacity: 0.85;
}

.mega-menu__item-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.mega-menu__item-title {
  font-weight: var(--font-semibold);
  font-size: var(--fs-sm);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mega-menu__item-desc {
  font-size: var(--fs-xs);
  color: rgba(10, 37, 64, 0.55);
  line-height: 1.4;
}

/* AI badge in mega menu */
.badge--ai {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  font-size: 0.625rem;
  font-weight: var(--font-bold);
  background: var(--color-navy);
  color: var(--color-teal);
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* View all link */
.mega-menu__view-all {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: var(--fs-xs);
  font-weight: var(--font-semibold);
  color: var(--color-on-light-teal);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  margin-top: 0.25rem;
  transition: gap var(--transition-fast) ease, color var(--transition-fast) ease;
}

.mega-menu__view-all:hover {
  gap: 0.625rem;
  color: var(--color-navy);
}

.mega-menu__view-all svg {
  transition: transform var(--transition-base) var(--ease-bounce);
}
.mega-menu__view-all:hover svg { transform: translateX(2px); }

/* Mega menu backdrop (darkens page behind) */
.mega-menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 37, 64, 0.35);
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base) ease, visibility var(--transition-base);
}

.mega-menu-backdrop.is-visible {
  opacity: 1;
  visibility: visible;
}

/* Dim page when mega is hovered or contains focus */
body:has(.nav__item--mega:is(:hover, :focus-within)) .mega-menu-backdrop {
  opacity: 1;
  visibility: visible;
}

@media (prefers-reduced-motion: reduce) {
  .mega-menu,
  .mega-menu-backdrop {
    transition: none;
  }
}

/* ===========================
   HAMBURGER (mobile toggle)
   =========================== */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  padding: 10px 8px;
  margin: -10px -8px -10px 0;
  cursor: pointer;
  z-index: 101;
}

.hamburger__line {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-navy);
  border-radius: 2px;
  transition: transform var(--transition-base) var(--ease-bounce),
              opacity var(--transition-fast) ease;
}

/* X animation when open (JS sets aria-expanded) */
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===========================
   MOBILE MENU
   =========================== */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-off-white);
  z-index: 99;
  padding-top: calc(var(--header-height) + 1.5rem + env(safe-area-inset-top, 0px));
  padding-right: max(var(--container-px), env(safe-area-inset-right, 0px));
  padding-bottom: max(2rem, env(safe-area-inset-bottom, 0px));
  padding-left: max(var(--container-px), env(safe-area-inset-left, 0px));
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity var(--transition-base) var(--ease-smooth),
              transform var(--transition-base) var(--ease-smooth),
              visibility var(--transition-base);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-menu__inner {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: var(--font-bold);
  color: var(--color-navy);
  text-decoration: none;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(10, 37, 64, 0.1);
  transition: color var(--transition-fast) ease;
  width: 100%;
}

.mobile-menu__link:hover { color: var(--color-on-light-teal); }

.mobile-menu__link svg {
  transition: transform var(--transition-base) var(--ease-bounce);
}

.mobile-menu__accordion-btn[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

/* Accordion sub-menu */
.mobile-menu__accordion {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow) var(--ease-smooth);
}

.mobile-menu__accordion[aria-hidden="false"] {
  max-height: 600px;
}

.mobile-menu__group {
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(10, 37, 64, 0.06);
}

.mobile-menu__group-title {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: var(--font-bold);
  color: var(--color-on-light-teal);
  text-decoration: none;
  padding: 0.5rem 0 0.375rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.mobile-menu__group-title:hover { color: var(--color-navy); }

.mobile-menu__group ul {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-menu__group ul li a {
  display: block;
  font-size: var(--fs-sm);
  color: rgba(10, 37, 64, 0.7);
  text-decoration: none;
  padding: 0.5rem 0 0.5rem 1rem;
  border-left: 2px solid rgba(10, 37, 64, 0.12);
  transition: color var(--transition-fast) ease, border-color var(--transition-fast) ease;
}

.mobile-menu__group ul li a:hover {
  color: var(--color-on-light-teal);
  border-left-color: var(--color-teal-a11y);
}

/* Full-width CTA button at bottom of mobile menu */
.btn--block {
  display: flex;
  width: 100%;
  justify-content: center;
  margin-top: auto;
  padding-top: 1.5rem;
}

/* Scroll lock when mobile menu is open */
html.menu-open,
html.menu-open body {
  overflow: hidden;
  height: 100%;
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1023px) {
  .nav { display: none; }
  .header__actions { display: none; }
  .hamburger { display: flex; }
}

@media (max-width: 767px) {
  .mobile-menu__link { font-size: 1.25rem; }
}