/* ============================================================
   insead-header.css
   INSEAD-style premium academic restyle of the site HEADER.
   CSS-only — targets existing classes from Header.jsx.
   Linked LAST so it wins. Tokens defined in :root by insead.css.
   ============================================================ */

/* ---------- Sticky top bar: mostly-white, generous height ---------- */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  box-shadow: none;
  transition: background .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.header .container {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 84px;
  padding-top: 0;
  padding-bottom: 0;
}

/* Solid white + hairline + soft shadow on scroll */
.header.scrolled {
  background: #fff;
  border-bottom-color: var(--ins-line);
  box-shadow: 0 1px 0 var(--ins-line), 0 6px 24px rgba(10, 86, 64, .06);
}

.header.scrolled .container {
  min-height: 72px;
  transition: min-height .25s ease;
}

/* ---------- Logo (leave image as-is) ---------- */
.header .logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.header .logo-text {
  font-family: var(--ins-serif);
  color: var(--ins-ink);
  font-weight: 700;
  letter-spacing: .2px;
}
.header .logo-text span { color: var(--ins-navy); }

/* ---------- Primary nav ---------- */
.header .nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

/* Nav links: Inter, ink, medium weight, animated underline reveal */
.header .nav .nav-link {
  position: relative;
  font-family: var(--ins-sans);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: .1px;
  color: var(--ins-ink);
  background: none;
  padding: 10px 14px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color .2s ease;
}

.header .nav .nav-link i.fa-chevron-down {
  font-size: .62em;
  opacity: .65;
  transition: transform .2s ease;
}

.header .nav .nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 2px;
  background: var(--ins-navy);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s ease;
  border-radius: 2px;
}

.header .nav .nav-link:hover,
.header .nav .nav-link:focus-visible {
  color: var(--ins-navy);
}

.header .nav .nav-link:hover::after,
.header .nav .nav-link:focus-visible::after,
.header .nav .nav-link.active::after {
  transform: scaleX(1);
}

.header .nav .nav-link.active {
  color: var(--ins-navy);
  font-weight: 600;
}

.header .nav .has-dropdown:hover .nav-link i.fa-chevron-down {
  transform: rotate(180deg);
}

/* ---------- Mega-menu dropdown panels ---------- */
.header .dropdown.dropdown--mega {
  background: #fff;
  border: 1px solid var(--ins-line);
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(10, 86, 64, .12), 0 2px 8px rgba(26, 26, 26, .05);
  padding: 26px 28px;
  /* smooth fade/slide-in (works with existing show-on-hover; assumes opacity/visibility toggled) */
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}

.header .has-dropdown:hover .dropdown.dropdown--mega,
.header .has-dropdown:focus-within .dropdown.dropdown--mega {
  opacity: 1;
  transform: translateY(0);
}

/* Section / eyebrow labels in green */
.header .mega-col__heading {
  font-family: var(--ins-sans);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ins-navy);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ins-line);
}

/* Mega menu item links */
.header .mega-col a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ins-sans);
  font-weight: 500;
  font-size: .9rem;
  color: var(--ins-ink);
  text-decoration: none;
  padding: 9px 10px 9px 12px;
  border-radius: 8px;
  transition: color .18s ease, background .18s ease, padding-left .18s ease;
}

.header .mega-col a i {
  color: var(--ins-blue);
  width: 18px;
  text-align: center;
  font-size: .92em;
  transition: color .18s ease;
}

.header .mega-col a:hover {
  color: var(--ins-navy);
  background: var(--ins-bg);
  padding-left: 16px;
}
.header .mega-col a:hover i { color: var(--ins-navy); }

/* Green-tinted featured/promo column */
.header .mega-col--cta .mega-cta-card {
  background: linear-gradient(160deg, rgba(10, 86, 64, .06), rgba(28, 138, 94, .04));
  border: 1px solid rgba(10, 86, 64, .14);
  border-radius: 12px;
  padding: 22px 20px;
}

.header .mega-cta-card h5 {
  font-family: var(--ins-serif);
  color: var(--ins-ink);
  font-size: 1.05rem;
  margin: 0 0 6px;
}
.header .mega-cta-card p {
  font-family: var(--ins-sans);
  color: var(--ins-body);
  font-size: .85rem;
  line-height: 1.5;
  margin: 0 0 14px;
}

/* ---------- Nav actions / CTA buttons ---------- */
.header .nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header .nav-actions .nav-link {
  position: relative;
  font-family: var(--ins-sans);
  font-weight: 500;
  font-size: .9rem;
  color: var(--ins-ink);
  padding: 8px 4px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  transition: color .18s ease;
}
.header .nav-actions .nav-link i { color: var(--ins-blue); }
.header .nav-actions .nav-link:hover { color: var(--ins-navy); }
.header .nav-actions .nav-link:hover i { color: var(--ins-navy); }

/* Primary CTA → solid green pill */
.header .nav-actions .btn-gold {
  background: var(--ins-navy);
  background-image: none;
  color: #fff;
  border: none;
  border-radius: 999px;
  font-family: var(--ins-sans);
  font-weight: 600;
  font-size: .9rem;
  letter-spacing: .1px;
  padding: 11px 22px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 10px rgba(10, 86, 64, .18);
  transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
}
.header .nav-actions .btn-gold:hover {
  background: var(--ins-navy-2);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(10, 86, 64, .26);
}
.header .nav-actions .btn-gold i { color: #fff; }

/* Mega CTA card buttons: primary green pill + clean outline secondary */
.header .mega-cta-card .btn-gold {
  background: var(--ins-navy);
  background-image: none;
  color: #fff;
  border: none;
  border-radius: 999px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  transition: background .2s ease, transform .2s ease;
}
.header .mega-cta-card .btn-gold:hover {
  background: var(--ins-navy-2);
  transform: translateY(-1px);
}
.header .mega-cta-card .btn-gold i { color: #fff; }

.header .mega-cta-card .btn-outline-white {
  background: transparent;
  color: var(--ins-navy);
  border: 1px solid rgba(10, 86, 64, .35);
  border-radius: 999px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.header .mega-cta-card .btn-outline-white:hover {
  background: var(--ins-navy);
  border-color: var(--ins-navy);
  color: #fff;
}
.header .mega-cta-card .btn-outline-white i { color: inherit; }

/* ---------- Mobile toggle ---------- */
.header .menu-toggle span {
  background: var(--ins-ink);
  transition: background .2s ease, transform .25s ease, opacity .2s ease;
}
.header .menu-toggle.open span { background: var(--ins-navy); }

/* ---------- Mobile off-canvas nav (palette only, no layout change) ---------- */
.mobile-nav {
  background: #fff;
}
.mobile-nav__header {
  border-bottom: 1px solid var(--ins-line);
}
.mobile-close {
  color: var(--ins-ink);
  transition: color .18s ease;
}
.mobile-close:hover { color: var(--ins-navy); }

.mobile-nav__section-title {
  font-family: var(--ins-sans);
  font-weight: 700;
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ins-navy);
}

.mobile-nav__link {
  font-family: var(--ins-sans);
  font-weight: 500;
  color: var(--ins-ink);
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: color .18s ease, background .18s ease;
}
.mobile-nav__link i { color: var(--ins-blue); transition: color .18s ease; }
.mobile-nav__link:hover {
  color: var(--ins-navy);
  background: var(--ins-bg);
}
.mobile-nav__link:hover i { color: var(--ins-navy); }

.mobile-nav__cta .btn-gold {
  background: var(--ins-navy);
  background-image: none;
  color: #fff;
  border: none;
  border-radius: 999px;
  font-weight: 600;
  transition: background .2s ease;
}
.mobile-nav__cta .btn-gold:hover { background: var(--ins-navy-2); }
.mobile-nav__cta .btn-gold i { color: #fff; }

.mobile-overlay {
  background: rgba(10, 86, 64, .35);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

/* ---------- Accessibility: visible focus on white ---------- */
.header a:focus-visible,
.header button:focus-visible,
.mobile-nav a:focus-visible,
.mobile-nav button:focus-visible {
  outline: 2px solid var(--ins-navy);
  outline-offset: 2px;
  border-radius: 6px;
}