*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  overflow-x: hidden;
}

::selection {
  background: #4aad83;
  color: #f4faf8;
}

/* Scroll reveal base — progressive enhancement */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  }

  .reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }

  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
}

/* Navbar scroll state */
.nav-scrolled {
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(10, 31, 51, 0.06);
}

.nav-scrolled .font-serif {
  color: #0a1f33 !important;
}

.nav-scrolled a:not(.mobile-link) {
  color: #1e4466 !important;
}

/* Mobile menu */
#mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}

#mobile-menu.close {
  opacity: 0;
  pointer-events: none;
}

.mobile-link {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease, color 0.3s ease;
}

#mobile-menu.open .mobile-link {
  opacity: 1;
  transform: translateY(0);
}

#mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.08s; }
#mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.16s; }
#mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.24s; }

/* Hamburger animation */
#menu-btn[aria-expanded="true"] #bar1 {
  transform: translateY(5px) rotate(45deg);
}

#menu-btn[aria-expanded="true"] #bar2 {
  opacity: 0;
}

#menu-btn[aria-expanded="true"] #bar3 {
  transform: translateY(-5px) rotate(-45deg);
  width: 5rem;
}

/* Subtle image hover */
img {
  display: block;
  max-width: 100%;
}

/* Focus styles */
a:focus-visible, button:focus-visible {
  outline: 2px solid #4aad83;
  outline-offset: 2px;
  border-radius: 4px;
}