/* ─── Base & Reset ─── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; -webkit-font-smoothing: antialiased; }

/* ─── Animations ─── */
@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.05); }
}
@keyframes float-delay {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-15px) scale(1.03); }
}

.animate-float { animation: float 8s ease-in-out infinite; }
.animate-float-delay { animation: float-delay 10s ease-in-out infinite 2s; }

/* ─── Scroll Reveal (progressive enhancement) ─── */
.scroll-reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
  }
  .scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Navbar ─── */
#navbar {
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}
#navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 20px rgba(15, 34, 84, 0.08);
}

/* ─── Mobile Menu ─── */
#mobileMenu {
  animation: slideDown 0.3s ease;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Utility ─── */
::selection { background: rgba(74, 222, 128, 0.3); }

/* ─── Focus styles ─── */
input:focus, select:focus, textarea:focus {
  outline: none;
}

/* ─── Smooth scroll offset for fixed nav ─── */
section[id] {
  scroll-margin-top: 80px;
}