/* Modern interaction styles layered on top of existing main.css */

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2005;
  background: rgba(255, 255, 255, 0.06);
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 100%;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--accent-color), var(--gold-color));
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.25);
}

/* Active nav link */
.nav-links a.is-active {
  color: var(--gold-color);
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.25);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms cubic-bezier(0.2, 0, 0, 1), transform 700ms cubic-bezier(0.2, 0, 0, 1);
  will-change: opacity, transform;
}
.reveal.reveal--in {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 46px;
  height: 46px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(0, 0, 0, 0.45);
  color: white;
  cursor: pointer;
  z-index: 2004;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease, background-color 200ms ease;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.back-to-top:hover {
  background: rgba(0, 0, 0, 0.65);
}
.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Make the arrow feel interactive */
.arrow-down {
  cursor: pointer;
  pointer-events: auto;
  transition: transform 200ms ease, opacity 200ms ease;
}
.arrow-down:hover {
  transform: rotate(45deg) translate(2px, 2px);
  opacity: 0.9;
}
.arrow-down:focus {
  outline: 2px solid rgba(255, 215, 0, 0.6);
  outline-offset: 6px;
}