:root {
  --fg: #fff;
  --fg-dim: rgb(255 255 255 / 0.5);
  /* WebGL のフォグ色にも使われます */
  --bg: #0c0c0c;
  --edge: clamp(2rem, 3.5vw, 3rem);
  --text-small: 0.7rem;
  --text-large: clamp(20px, 3.5vw, 40px);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

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

body {
  font-family: "Google Sans Flex", sans-serif;
  background-color: var(--bg);
  color: var(--fg);
}

h1 {
  font-size: var(--text-large);
  font-weight: 350;
  line-height: 1.2;
}

p {
  font-size: var(--text-small);
  font-weight: 400;
  line-height: 1.35;
  text-transform: uppercase;
}

.container {
  position: relative;
  width: 100%;
  max-width: 2000px;
  margin-inline: auto;
  padding: var(--edge);
}

/* ---------- Slider ---------- */

.slider {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100svh;
  overflow: hidden;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.slider.is-clickable {
  cursor: pointer;
}

.slider.is-expanded {
  cursor: zoom-out;
}

.slider.is-dragging {
  cursor: grabbing;
}

.slider canvas {
  display: block;
}

/* ---------- Mask reveal ---------- */

.slide-info p,
.detail-close {
  overflow: hidden;
}

.slide-info p > span,
.detail-close > span {
  display: block;
  will-change: transform;
}

.line-mask {
  overflow: hidden;
}

/* ---------- Info bar ---------- */

.slide-info {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 10;
  pointer-events: none;
}

.slide-info .container {
  padding: calc(var(--edge) - 1rem);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.slide-info p {
  margin: 1rem;
  font-variant-numeric: tabular-nums;
}

.slide-info p:nth-child(2) {
  color: var(--fg-dim);
}

.info-count {
  justify-self: end;
}

/* ---------- Detail (expanded) ---------- */

.slide-detail {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  mix-blend-mode: difference;
}

.slide-detail .container {
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  padding-bottom: calc(var(--edge) + 3rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: end;
}

.detail-title {
  max-width: 14ch;
}

.detail-description {
  justify-self: end;
  max-width: 340px;
  text-transform: none;
  font-size: 0.85rem;
}

.detail-close {
  position: absolute;
  top: var(--edge);
  right: var(--edge);
  color: var(--fg-dim);
}

.slide-detail .line,
.slide-detail .char,
.slide-detail .word {
  will-change: transform;
}

@media (max-width: 1000px) {
  .slide-info .container {
    grid-template-columns: 1fr auto;
  }

  .slide-info p:nth-child(2) {
    display: none;
  }

  .slide-detail .container {
    grid-template-columns: 1fr;
  }

  .detail-description {
    justify-self: start;
  }
}