:root {
  color-scheme: dark;
  font-family:
    Inter, "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", Arial,
    sans-serif;
  background: #000;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #000;
}

.shell,
.pane,
iframe {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  border: 0;
  background: #000;
}

.pane {
  transition:
    opacity 900ms ease,
    transform 1100ms ease;
}

.intro-pane {
  z-index: 2;
  opacity: 1;
  transform: scale(1);
}

.story-pane {
  z-index: 1;
  opacity: 0;
  transform: scale(1.02);
  pointer-events: none;
}

.shell[data-mode="story"] .intro-pane {
  opacity: 0;
  transform: scale(1.025);
  pointer-events: none;
}

.shell[data-mode="story"] .story-pane {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.enter-button {
  position: fixed;
  z-index: 5;
  right: clamp(22px, 4vw, 56px);
  bottom: clamp(22px, 4vw, 46px);
  min-height: 38px;
  padding: 0 18px;
  border: 1px solid rgba(127, 182, 184, 0.36);
  border-radius: 2px;
  background: rgba(0, 0, 0, 0.36);
  color: rgba(235, 247, 247, 0.78);
  cursor: pointer;
  letter-spacing: 0;
  backdrop-filter: blur(10px);
  transition:
    opacity 360ms ease,
    border-color 180ms ease,
    color 180ms ease,
    background 180ms ease;
}

.enter-button:hover {
  border-color: rgba(255, 148, 31, 0.72);
  color: #fff;
  background: rgba(255, 148, 31, 0.12);
}

.shell[data-mode="story"] .enter-button {
  opacity: 0;
  pointer-events: none;
}