/* Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  overflow-x: hidden;
}

/* Scroll reveal — progressive enhancement, hidden by default, shown via JS */
@media (prefers-reduced-motion: no-preference) {
  .reveal-up {
    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-up.revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Always-visible fallback for no-JS or reduced-motion users */
@media (prefers-reduced-motion: reduce) {
  .reveal-up {
    opacity: 1;
    transform: none;
  }
}

/* Scroll line animation */
@keyframes scrollLine {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}
.animate-scroll-line {
  animation: scrollLine 1.8s ease-in-out infinite;
}

/* Navbar scroll state */
.navbar-scrolled {
  background: rgba(3, 10, 16, 0.92) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(56, 168, 140, 0.08);
}

/* Mobile menu */
.mobile-menu-open {
  opacity: 1 !important;
  pointer-events: all !important;
}

/* Custom selection */
::selection {
  background: rgba(56, 168, 140, 0.3);
  color: #f0f4f8;
}

/* Smooth focus */
a:focus-visible, button:focus-visible {
  outline: 1px solid rgba(56, 168, 140, 0.5);
  outline-offset: 4px;
}

/* Image lazy-loading fade */
img[loading="lazy"] {
  transition: opacity 0.4s ease;
}