/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: var(--z-back-to-top);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  box-shadow: 0 4px 20px rgba(245, 40, 106, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
}

/* Responsive CSS */
@media (max-width: 767px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }

  .section {
    padding-block: clamp(2.5rem, 6vw, 4rem);
  }

  .section-title {
    font-size: var(--text-3xl);
  }

  .hide-mobile {
    display: none;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .section-title {
    font-size: var(--text-3xl);
  }
}

@media (min-width: 1440px) {
  .section-title {
    font-size: var(--text-5xl);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}