/*
 * Header CSS — iCore Digital Marketing Solutions
 * Sticky header, mega menu (Services/Industries), mobile hamburger nav
 * Colors: #0A66C2 primary, #FF7A00 hover/CTA, #1A1A2E dark, #F5F7FA bg, #E5E7EB border
 */

/* ─── RESET & ROOT ──────────────────────────────────────────── */
:root {
  --color-primary:    #0A66C2;
  --color-secondary:  #FF7A00;
  --color-dark:       #1A1A2E;
  --color-bg:         #F5F7FA;
  --color-surface:    #FFFFFF;
  --color-text:       #1A1A2E;
  --color-muted:      #6B7280;
  --color-border:     #E5E7EB;
  --header-height:    72px;
  --transition-base:  200ms ease;
  --font-heading:     'Poppins', sans-serif;
  --font-body:        'Open Sans', sans-serif;
}

/* ─── SITE HEADER ───────────────────────────────────────────── */
#site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  font-family: var(--font-body);
}

#site-header.scrolled {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 2px 8px rgba(10, 102, 194, 0.08);
}

.header-inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 32px;
}

/* ─── LOGO ──────────────────────────────────────────────────── */
.site-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo img {
  height: 40px;
  width: auto;
  display: block;
}

.site-logo-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

/* ─── PRIMARY NAV ───────────────────────────────────────────── */
#primary-nav {
  display: flex;
  align-items: center;
  flex: 1;
  margin-left: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
}

.nav-menu > li {
  position: relative;
}

.nav-menu > li > a {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  border-radius: 4px;
  white-space: nowrap;
  transition: color var(--transition-base), background var(--transition-base);
  position: relative;
}

.nav-menu > li > a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.nav-menu > li > a:hover,
.nav-menu > li > a:focus {
  color: var(--color-primary);
  background: rgba(10, 102, 194, 0.06);
  outline: none;
}

.nav-menu > li > a:hover::after,
.nav-menu > li.current-menu-item > a::after {
  transform: scaleX(1);
}

.nav-menu > li.current-menu-item > a {
  color: var(--color-primary);
}

/* Mega menu arrow indicator */
.nav-menu > li.has-mega-menu > a .nav-arrow {
  display: inline-flex;
  width: 14px;
  height: 14px;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base);
  margin-left: 2px;
  opacity: 0.6;
}

.nav-menu > li.has-mega-menu:hover > a .nav-arrow,
.nav-menu > li.has-mega-menu:focus-within > a .nav-arrow {
  transform: rotate(180deg);
}

/* ─── MEGA MENU PANEL ───────────────────────────────────────── */
.mega-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 24px;
  min-width: 640px;
  display: none;
  z-index: 200;
}

/* Services mega: 3 columns */
.mega-menu--services {
  min-width: 720px;
}

/* Industries mega: 2 columns */
.mega-menu--industries {
  min-width: 520px;
}

.nav-menu > li.has-mega-menu:hover > .mega-menu,
.nav-menu > li.has-mega-menu:focus-within > .mega-menu {
  display: block;
}

.mega-menu__intro {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-body);
}

.mega-menu__grid {
  display: grid;
  gap: 0;
}

.mega-menu--services .mega-menu__grid {
  grid-template-columns: repeat(3, 1fr);
}

.mega-menu--industries .mega-menu__grid {
  grid-template-columns: repeat(2, 1fr);
}

.mega-menu__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  transition: background var(--transition-base), color var(--transition-base);
  border-radius: 4px;
  margin: 1px;
}

.mega-menu__item:last-child {
  border-bottom: none;
}

.mega-menu__item:hover {
  background: rgba(10, 102, 194, 0.05);
}

.mega-menu__item-icon {
  font-size: 1.125rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.mega-menu__item-label {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  display: block;
  line-height: 1.3;
  transition: color var(--transition-base);
}

.mega-menu__item:hover .mega-menu__item-label {
  color: var(--color-primary);
}

.mega-menu__item-desc {
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--color-muted);
  line-height: 1.4;
  margin-top: 2px;
  display: block;
}

/* Mega menu footer CTA */
.mega-menu__footer {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-family: var(--font-body);
  color: var(--color-muted);
}

.mega-menu__footer a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-base);
}

.mega-menu__footer a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

/* ─── HEADER CTA BUTTON ─────────────────────────────────────── */
.header-cta-wrap {
  flex-shrink: 0;
  margin-left: 16px;
}

.btn-header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-base), transform var(--transition-base);
}

.btn-header-cta:hover,
.btn-header-cta:focus {
  background: var(--color-secondary);
  color: #FFFFFF;
  outline: none;
  transform: translateY(-1px);
}

/* ─── HAMBURGER BUTTON (MOBILE) ─────────────────────────────── */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  flex-shrink: 0;
  transition: opacity var(--transition-base);
}

.hamburger-btn:hover {
  opacity: 0.7;
}

.hamburger-btn span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
  transform-origin: center;
}

/* Hamburger open state: X icon */
.hamburger-btn.is-open span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.hamburger-btn.is-open span:nth-child(2) {
  opacity: 0;
  width: 0;
}

.hamburger-btn.is-open span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* ─── MOBILE NAV DRAWER ─────────────────────────────────────── */
#mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  overflow-y: auto;
  z-index: 999;
  padding: 16px 0 32px;
  border-top: 1px solid var(--color-border);
}

#mobile-nav.is-open {
  display: block;
}

.mobile-nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav-menu > li {
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-menu > li > a,
.mobile-nav-menu > li > button.mobile-accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 16px 32px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: color var(--transition-base), background var(--transition-base);
}

.mobile-nav-menu > li > a:hover,
.mobile-nav-menu > li > button.mobile-accordion-trigger:hover {
  color: var(--color-primary);
  background: rgba(10, 102, 194, 0.04);
}

.mobile-accordion-trigger .accordion-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
  opacity: 0.5;
}

.mobile-accordion-trigger.is-open .accordion-arrow {
  transform: rotate(180deg);
}

/* Mobile accordion sub-list */
.mobile-sub-list {
  display: none;
  list-style: none;
  padding: 0;
  margin: 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.mobile-sub-list.is-open {
  display: block;
}

.mobile-sub-list li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 48px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-base), background var(--transition-base);
}

.mobile-sub-list li:last-child a {
  border-bottom: none;
}

.mobile-sub-list li a:hover {
  color: var(--color-primary);
  background: rgba(10, 102, 194, 0.04);
}

.mobile-sub-list li a .sub-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

/* Mobile CTA area */
.mobile-nav-cta {
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-mobile-cta {
  display: block;
  width: 100%;
  padding: 14px 20px;
  text-align: center;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: background var(--transition-base);
}

.btn-mobile-cta:hover {
  background: var(--color-secondary);
  color: #FFFFFF;
}

.mobile-contact-strip {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 32px 16px;
  font-family: var(--font-body);
  font-size: 0.875rem;
}

.mobile-contact-strip a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-base);
}

.mobile-contact-strip a:hover {
  color: var(--color-primary);
}

/* ─── SKIP LINK (ACCESSIBILITY) ─────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 0;
}

/* ─── RESPONSIVE BREAKPOINTS ────────────────────────────────── */

/* Tablet: hide mega menu, show hamburger */
@media (max-width: 1024px) {
  .header-inner {
    padding: 0 16px;
    gap: 16px;
  }

  .nav-menu > li > a {
    padding: 8px 8px;
    font-size: 0.8125rem;
  }

  .mega-menu--services {
    min-width: 560px;
    left: 0;
    transform: none;
  }

  .mega-menu--services .mega-menu__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mega-menu--industries {
    min-width: 420px;
    left: 0;
    transform: none;
  }

  .btn-header-cta {
    padding: 9px 14px;
    font-size: 0.8125rem;
  }
}

@media (max-width: 768px) {
  #site-header {
    height: 64px;
  }

  :root {
    --header-height: 64px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  /* Hide desktop nav on mobile */
  #primary-nav {
    display: none;
  }

  .header-cta-wrap {
    display: none;
  }

  /* Show hamburger on mobile */
  .hamburger-btn {
    display: flex;
  }
}

/* Large screens: wider padding */
@media (min-width: 1440px) {
  .header-inner {
    padding: 0 64px;
  }
}

/* ─── FOCUS STATES (ACCESSIBILITY) ─────────────────────────── */
.nav-menu > li > a:focus-visible,
.btn-header-cta:focus-visible,
.hamburger-btn:focus-visible,
.mega-menu__item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.mobile-nav-menu > li > a:focus-visible,
.mobile-accordion-trigger:focus-visible,
.mobile-sub-list li a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

/* ─── PRINT STYLES ──────────────────────────────────────────── */
@media print {
  #site-header {
    position: static;
    border-bottom: 1px solid #ccc;
  }

  .hamburger-btn,
  .btn-header-cta,
  .mega-menu {
    display: none !important;
  }
}