/* Base & Utilities */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  overflow-x: hidden;
}

/* Scroll line animation */
@keyframes scrollLine {
  0% { top: -16px; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

.scroll-line {
  animation: scrollLine 1.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

/* Reveal animations — progressive enhancement */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(32px);
    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);
  }
  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
  .reveal-delay-4 { transition-delay: 0.4s; }
}

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

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

/* Navbar scroll state */
#site-header.scrolled {
  background: rgba(4, 11, 22, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #040B16;
}
::-webkit-scrollbar-thumb {
  background: #319795;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #4FD1C5;
}

/* Selection */
::selection {
  background: rgba(79, 209, 197, 0.3);
  color: #040B16;
}

/* Form focus outlines */
input:focus, textarea:focus {
  outline: none;
}

/* Image loading */
img {
  display: block;
  max-width: 100%;
}

/* Print */
@media print {
  #site-header, #mobile-menu, .scroll-line { display: none; }
  body { color: #000; background: #fff; }
}