/* ---- background grid drift ---- */
#bg-grid {
  animation: gridDrift 40s linear infinite;
}

@keyframes gridDrift {
  0% { background-position: 0 0, 0 0; }
  100% { background-position: 64px 128px, 64px 128px; }
}

/* ---- transitions and transforms on hover ---- */
.surface-hover {
  transition: transform .3s ease, background .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.surface-hover:hover {
  background: var(--card-hover);
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.03);
}

.glow-border::before {
  transition: opacity .3s ease;
}

.glow-border:hover::before {
  opacity: 1;
}

.btn-primary {
  transition: box-shadow .3s ease, transform .3s ease, background .3s ease;
}

.btn-primary:hover {
  box-shadow: 0 0 0 1px rgba(0, 191, 255, 0.4), 0 0 40px -6px var(--glow);
  transform: translateY(-2px);
}

.btn-ghost {
  transition: border-color .3s ease, background .3s ease, transform .3s ease;
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.03);
  transform: translateY(-2px);
}

.nav-link {
  transition: color .25s ease;
}

.nav-link:hover {
  color: var(--text-1);
}

.nav-link::after {
  transition: width .25s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.tech-badge {
  transition: border-color .3s ease, background .3s ease;
}

.tech-badge:hover {
  border-color: var(--border-strong);
  background: var(--card-hover);
}

.tech-badge svg, .tech-badge img {
  transition: filter .3s ease, transform .3s ease;
}

.tech-badge:hover svg, .tech-badge:hover img {
  filter: grayscale(0) opacity(1);
  transform: translateY(-2px);
}

input, textarea {
  transition: border-color .25s ease, background .25s ease;
}

input:focus, textarea:focus {
  transition: border-color .25s ease, background .25s ease, box-shadow .25s ease;
}

/* ---- scroll reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s cubic-bezier(.16,.84,.44,1), transform .8s cubic-bezier(.16,.84,.44,1);
}

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

.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }
.reveal-delay-4 { transition-delay: .32s; }

/* ---- motion settings override ---- */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  #bg-grid {
    animation: none;
  }
  html {
    scroll-behavior: auto;
  }
}