.core {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail-w);
  z-index: 40;
  border-right: 1px solid var(--hairline);
  background: var(--pumice);
  overflow: hidden;
  contain: strict;
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.85s var(--ease-core);
}

.core__window {
  position: absolute;
  inset: 0;
}

.core__tape {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  will-change: transform;
  opacity: 0;
  transition: opacity 0.6s 0.5s ease;
}

.core__barrel {
  position: absolute;
  top: 0;
  left: 10px;
  width: 30px;
  height: 100%;
  border-left: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
  background-color: var(--ash);
  background-image: var(--lith-tuff);
  transform-origin: top;
}

.core__barrel-seg {
  position: absolute;
  left: 0;
  width: 100%;
  background-color: var(--ash);
  border-top: 1px solid var(--hairline);
}

.core__barrel-seg[data-lith='ash'] {
  background-image: var(--lith-ash);
}
.core__barrel-seg[data-lith='lapilli'] {
  background-image: var(--lith-lapilli);
}
.core__barrel-seg[data-lith='scoria'] {
  background-image: var(--lith-scoria);
}
.core__barrel-seg[data-lith='bedrock'] {
  background-color: var(--basalt-soft);
  background-image: var(--lith-bedrock);
  opacity: 0.92;
}

.core__tick {
  position: absolute;
  left: 46px;
  width: 5px;
  height: 1px;
  background: var(--hatch);
}

.core__tick--major {
  background: var(--ink-2);
  width: 9px;
}

.core__tick-label {
  position: absolute;
  left: 13px;
  top: -0.62em;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}

.core__head {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 0;
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s 0.9s ease;
}

.core__head-line {
  position: absolute;
  left: 4px;
  right: 4px;
  top: 0;
  height: 1px;
  background: var(--basalt);
}

.core__head-nib {
  position: absolute;
  left: 4px;
  top: -4px;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--sulfur);
}

.core__readout {
  position: absolute;
  left: 44px;
  top: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--basalt);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  background: var(--pumice);
  padding: 1px 3px 1px 5px;
}

.core__unit {
  position: absolute;
  z-index: 3;
  bottom: 1rem;
  left: 0;
  right: 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.5rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.core__cap {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3rem;
  background: linear-gradient(var(--pumice) 38%, rgba(241, 242, 238, 0));
  z-index: 2;
}

.core__cap--bottom {
  top: auto;
  bottom: 0;
  background: linear-gradient(rgba(241, 242, 238, 0), var(--pumice) 62%);
}

html.is-ready .core {
  clip-path: inset(0 0 0 0);
}

html.is-ready .core__tape {
  opacity: 1;
}

html.is-ready .core__head {
  opacity: 1;
}

.core__bar {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--olivine-mid);
  transform-origin: left;
  scale: var(--core-progress, 0) 1;
}

.core-chip {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .core {
    inset: 0 0 auto;
    width: 100%;
    height: 3px;
    border-right: 0;
    background: var(--hairline-soft);
    clip-path: none;
    z-index: 60;
  }

  .core__window,
  .core__head,
  .core__cap,
  .core__unit {
    display: none;
  }

  .core__bar {
    display: block;
  }

  .core-chip {
    display: inline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .core,
  .core__tape,
  .core__head {
    clip-path: none;
    opacity: 1;
  }
}