:root {
  --glass-bg: rgba(255, 255, 255, 0.88);
  --glass-border: rgba(0, 0, 0, 0.08);
}

html.dark {
  --glass-bg: rgba(10, 20, 18, 0.85);
  --glass-border: rgba(45, 212, 191, 0.12);
}

body {
  transition: background-color 0.4s ease, color 0.4s ease;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: #060d0c;
}
::-webkit-scrollbar-thumb {
  background: #0d9488;
  border-radius: 2px;
}
::-webkit-scrollbar-thumb:hover {
  background: #14b8a6;
}

/* Subtle tech grid background */
.grid-bg {
  background-image:
    linear-gradient(to right, rgba(20, 184, 166, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 184, 166, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* Card hover elevations */
.cert-card, .project-card, .exp-card {
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.cert-card:hover, .project-card:hover, .exp-card:hover {
  transform: translateY(-4px);
}

/* Navigation active indicator */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  display: block;
  height: 2px;
  background: #14b8a6;
  transform: scaleX(0);
  transition: transform 0.25s ease;
  transform-origin: left;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* Scroll reveal classes */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hero animations */
.animate-fade-in-up {
  opacity: 0;
}

.initiated.animate-fade-in-up,
.initiated .animate-fade-in-up {
  animation: fadeInUp 0.7s ease-out forwards;
}

/* Accessibility: reduce motion */
@media (prefers-reduced-motion: reduce) {
  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .cert-card:hover, .project-card:hover, .exp-card:hover {
    transform: none !important;
  }
  .animate-scan,
  .animate-pulse,
  .animate-pulse-slow,
  .animate-blink,
  .animate-fade-in-up,
  .animate-expand {
    animation: none !important;
  }
}