html {
  background: #e8e2d7;
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  overflow: clip;
  background: var(--paper);
}

.scene {
  position: relative;
  isolation: isolate;
}

.paper-scene {
  background-color: var(--paper);
  background-image: url("/assets/images/bg-paper-main.avif");
  background-repeat: repeat;
  background-size: 600px 800px;
}

.light-scene {
  background: var(--paper-light);
}

.end-scene {
  background-color: var(--paper-end);
  background-image: url("/assets/images/bg-paper-main.avif");
  background-repeat: repeat;
  background-size: 600px 800px;
  background-blend-mode: screen;
}

.scene-scroll {
  position: relative;
}

.sticky-frame {
  position: sticky;
  top: 0;
  width: 100%;
  height: 100svh;
  min-height: 560px;
  overflow: hidden;
}

.stage-fill,
.stage-fill img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.stage-fill img {
  object-fit: cover;
}

.scene-index {
  position: absolute;
  z-index: 20;
  top: calc(24px + env(safe-area-inset-top));
  right: var(--space-page);
  left: var(--space-page);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: rgba(28, 28, 25, .48);
  font-size: 10px;
  letter-spacing: .16em;
  line-height: 1;
  text-transform: uppercase;
}

.scene-index > span:first-child {
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
}

.scene-index-light {
  color: rgba(250, 249, 245, .68);
  text-shadow: 0 1px 12px rgba(0, 0, 0, .22);
}

.reading-progress {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  height: 2px;
  pointer-events: none;
  transform: translateZ(0);
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--cinnabar);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

.toast {
  position: fixed;
  z-index: 120;
  left: 50%;
  bottom: calc(28px + env(safe-area-inset-bottom));
  display: grid;
  width: 126px;
  min-height: 42px;
  place-items: center;
  border: 1px solid rgba(28, 28, 25, .12);
  background: rgba(250, 249, 245, .96);
  box-shadow: 0 10px 35px rgba(30, 25, 18, .08);
  color: var(--ink);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 8px);
  transition: opacity 280ms var(--ease-main), transform 280ms var(--ease-main);
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.noscript {
  position: fixed;
  z-index: 200;
  right: 16px;
  bottom: 16px;
  left: 16px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: var(--paper-light);
  font-size: 13px;
  text-align: center;
}

.low-performance .dust-field {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}