/* =========================================================
   ICME ACADEMY — HEADER / NAVIGATION
   Structure, class names and interaction model (sticky-on-scroll,
   hover dropdown on desktop, left off-canvas panel + accordion
   sub-menu on mobile) are adapted from the "Medox" HTML template
   (site-header / sticky-header / main-bar / header-nav / nav /
   sub-menu-down / sub-menu / mega-menu / dlab-social-icon), restyled
   with ICME's navy & gold palette and extended with a dynamic
   "Departments" mega-menu. See assets/js/navbar.js for behaviour.
   ========================================================= */

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  background: #fff;
  box-shadow: 0 2px 20px rgba(11, 31, 58, 0.06);
}

.sticky-header {
  width: 100%;
  background: #fff;
  transition: all 0.4s var(--ease);
}
.sticky-header.is-fixed {
  position: fixed;
  top: 0;
  left: 0;
  background: #fff;
  box-shadow: 0 10px 30px rgba(11, 31, 58, 0.1);
  animation: headerSlideDown 0.5s var(--ease);
}
@keyframes headerSlideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

.main-bar { position: relative; }
.main-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0;
}

/* ---------- Logo ---------- */
.logo-header img { height: 46px; display: block; }
.logo-header.mobile-only { display: none; }

/* ---------- Extra nav (phone + CTA) ---------- */
.extra-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}
.extra-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-navy);
  text-decoration: none;
  font-size: var(--fs-sm);
  font-weight: 600;
  white-space: nowrap;
}
.extra-phone i { color: var(--color-gold-dark); }

/* ---------- Hamburger toggler ---------- */
.navbar-toggler {
  display: none;
  width: 34px;
  height: 26px;
  position: relative;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.navbar-toggler span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
  transition: all 0.35s var(--ease);
}
.navbar-toggler span:nth-child(1) { top: 0; }
.navbar-toggler span:nth-child(2) { top: 12px; }
.navbar-toggler span:nth-child(3) { top: 24px; }
.navbar-toggler.active span { background: var(--color-navy); }
.navbar-toggler.active span:nth-child(1) { top: 12px; transform: rotate(45deg); }
.navbar-toggler.active span:nth-child(2) { opacity: 0; }
.navbar-toggler.active span:nth-child(3) { top: 12px; transform: rotate(-45deg); }

/* ---------- Nav list ---------- */
.header-nav {
  margin-left: 10px;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.header-nav .nav {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}
.header-nav .nav > li { position: relative; }
.header-nav .nav > li > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-navy);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
  padding: 14px 16px;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.header-nav .nav > li > a i { font-size: 10px; transition: transform var(--transition-fast); }
.header-nav .nav > li:hover > a,
.header-nav .nav > li > a.active,
.header-nav .nav > li.active > a { color: var(--color-gold-dark); }
.header-nav .nav > li:hover > a i { transform: rotate(180deg); }

/* ---------- Simple dropdown (sub-menu) ---------- */
.sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 230px;
  background: #fff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  padding: 10px 0;
  margin-top: 14px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.3s var(--ease);
  z-index: 20;
}
.header-nav .nav > li:hover > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  margin-top: 0;
}
.sub-menu li a {
  display: block;
  padding: 10px 22px;
  color: var(--color-navy);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition-fast);
}
.sub-menu li a:hover { background: var(--color-off-white); color: var(--color-gold-dark); padding-left: 26px; }

/* ---------- Departments mega-menu ---------- */
.mega-menu {
  min-width: 620px;
  left: 50%;
  transform: translate(-50%, 8px);
  padding: 28px;
}
.header-nav .nav > li:hover > .mega-menu {
  transform: translate(-50%, 0);
}
.mega-menu-panel { padding: 0; }
.dept-mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 16px;
}
.dept-mega-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px !important;
  border-radius: var(--radius-sm);
  font-size: 13px !important;
  font-weight: 500;
  color: var(--color-navy) !important;
}
.dept-mega-item i {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(199, 165, 92, 0.12);
  color: var(--color-gold-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
}
.dept-mega-item:hover {
  background: var(--color-off-white) !important;
  padding-left: 12px !important;
}
.dept-mega-viewall {
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--color-navy);
  color: #fff !important;
  border-radius: var(--radius-sm);
  padding: 13px !important;
  font-weight: 600 !important;
  text-align: center;
}
.dept-mega-viewall:hover { background: var(--color-gold-dark); padding-left: 13px !important; }

/* ---------- Social icons (shown in mobile off-canvas) ---------- */
.dlab-social-icon { display: none; }
.dlab-social-icon ul { display: flex; gap: 12px; }
.dlab-social-icon a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: var(--transition-fast);
}
.dlab-social-icon a:hover { background: var(--color-gold); }

/* ---------- Overlay (mobile) ---------- */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 18, 41, 0.6);
  z-index: calc(var(--z-header) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease);
}
.nav-overlay.show { opacity: 1; visibility: visible; }

/* =========================================================
   MOBILE (off-canvas "mo-left" panel)
   ========================================================= */
@media (max-width: 991px) {
  .main-bar-inner { padding: 14px 0; }
  .navbar-toggler { display: block; }
  .extra-phone { display: none; }
  .extra-nav .btn { padding: 11px 18px; font-size: var(--fs-xs); }

  .header-nav {
    position: fixed;
    top: 0;
    left: -300px;
    width: 280px;
    height: 100vh;
    margin: 0;
    background: var(--color-navy-dark);
    z-index: var(--z-overlay);
    overflow-y: auto;
    transition: left 0.45s var(--ease);
    padding: 0 0 40px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
  }
  .header-nav.show { left: 0; }

  .logo-header.mobile-only {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .logo-header.mobile-only img { height: 42px; }
  .nav-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 22px;
    cursor: pointer;
  }

  .header-nav .nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 0;
  }
  .header-nav .nav > li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .header-nav .nav > li > a {
    width: 100%;
    padding: 15px 22px;
    justify-content: space-between;
  }
  .header-nav .nav > li:hover > a i { transform: none; }
  .header-nav .nav > li.open > a i { transform: rotate(180deg); }

  /* Sub-menu becomes an inline accordion, not an absolute dropdown */
  .sub-menu, .mega-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    min-width: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 0;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease);
  }
  .header-nav .nav > li:hover > .sub-menu,
  .header-nav .nav > li:hover > .mega-menu {
    transform: none;
  }
  .header-nav .nav > li.open > .sub-menu,
  .header-nav .nav > li.open > .mega-menu {
    max-height: 1200px;
  }
  .sub-menu li a { color: rgba(255, 255, 255, 0.8); padding: 12px 32px; }
  .sub-menu li a:hover { background: rgba(255, 255, 255, 0.06); color: var(--color-gold); padding-left: 36px; }

  .mega-menu-panel { padding: 14px 20px 20px; }
  .dept-mega-grid { grid-template-columns: 1fr; gap: 2px; margin-bottom: 14px; }
  .dept-mega-item { color: rgba(255, 255, 255, 0.85) !important; }
  .dept-mega-item:hover { background: rgba(255, 255, 255, 0.06) !important; }

  .dlab-social-icon {
    display: block;
    padding: 20px 22px 0;
  }
}

@media (min-width: 992px) {
  .header-nav .nav > li.open > .sub-menu,
  .header-nav .nav > li.open > .mega-menu {
    /* Desktop uses :hover only; .open is a mobile-only concept */
  }
}