* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: #000;
  overflow: hidden;
}

.stage {
  height: 100vh;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
}

/* Keeps the exact aspect ratio of the artwork so the button
   always lands on the marked dashed area, regardless of screen size. */
.frame {
  position: relative;
  height: 100vh;
  width: calc(100vh * 863 / 1822);
  max-width: 100vw;
  max-height: calc(100vw * 1822 / 863);
}

.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
  color: #fff;
  font-family: system-ui, sans-serif;
}

.slide.active {
  opacity: 1;
}

.whats-btn {
  position: absolute;
  border-radius: 999px;
  cursor: pointer;
  outline: none;
  color: white;
  -webkit-tap-highlight-color: transparent;
  transition: left 1.2s ease-in-out, top 1.2s ease-in-out, width 1.2s ease-in-out, height 1.2s ease-in-out;
}

.whats-btn:focus-visible {
  box-shadow: 0 0 0 3px #d9a25c;
}