/* Base & utilities */
html {
  scroll-behavior: smooth;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Navbar scroll state */
.nav-scrolled {
  background: rgba(255, 255, 255, 0.95) !important;
  box-shadow: 0 1px 20px rgba(13, 148, 136, 0.08);
}

.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: #0d9488;
  transition: all 0.2s ease;
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 60%;
}

/* Floating card animations */
@keyframes float-1 {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

@keyframes float-2 {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
}

@keyframes float-3 {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.float-card-1 {
  animation: float-1 4s ease-in-out infinite;
}

.float-card-2 {
  animation: float-2 5s ease-in-out infinite;
}

.float-card-3 {
  animation: float-3 4.5s ease-in-out infinite;
}

/* Scroll reveal — progressive enhancement */
.scroll-reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .scroll-reveal {
    opacity: 0;
    transform: translateY(24px);
  }

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

/* Feature items */
.feature-item {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .feature-item {
    opacity: 0;
    transform: translateY(16px);
  }

  .feature-item.revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile menu */
#mobile-menu {
  animation: slideDown 0.25s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Smooth image loading */
img {
  background-color: #f1f5f9;
}

/* Selection color */
::selection {
  background-color: #99f6e4;
  color: #134e4a;
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
  outline: 2px solid #0d9488;
  outline-offset: 2px;
  border-radius: 8px;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f8fafc;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}