/* ── Base ── */
html { scroll-behavior: smooth; }
body { overflow-x: hidden; }

/* ── Nav scroll state ── */
#nav.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 20px rgba(15,19,61,0.08);
}
#nav.scrolled .font-heading { color: #0f133d; }

/* ── Floating cards ── */
@keyframes float1 {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%       { transform: translateY(-14px) rotate(1deg); }
}
@keyframes float2 {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%       { transform: translateY(-10px) rotate(-1deg); }
}
@keyframes float3 {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%       { transform: translateY(-18px) rotate(1.5deg); }
}
@keyframes float4 {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%       { transform: translateY(-8px) rotate(-0.5deg); }
}
.floating-card { will-change: transform; }
.card-1 { animation: float1 4.5s ease-in-out infinite; }
.card-2 { animation: float2 5s ease-in-out infinite; }
.card-3 { animation: float3 4s ease-in-out infinite; }
.card-4 { animation: float4 5.5s ease-in-out infinite; }

/* ── Reveal on scroll (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1), transform 0.7s cubic-bezier(0.22,1,0.36,1);
  }
  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }
}
/* If JS is disabled or reduced-motion is preferred, content stays visible */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ── Mobile menu transition ── */
#mobileMenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.22,1,0.36,1), opacity 0.25s ease;
  opacity: 0;
}
#mobileMenu.open {
  max-height: 400px;
  opacity: 1;
}
.mobile-link { display: block; }