.section-rail {
  --read-progress: 0%;
}

.section-rail::before {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  width: var(--read-progress);
  height: 2px;
  content: "";
  background: var(--accent);
  transition: width 0.12s linear;
}

.rail-progress {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 7px;
  height: 44px;
  margin-left: 4px;
  padding-left: 12px;
  color: var(--ink-faint);
  border-left: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.rail-progress-label {
  letter-spacing: 0.045em;
}

.rail-progress b {
  min-width: 40px;
  color: var(--accent-deep);
  font-weight: 600;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 680px) {
  .rail-title {
    display: none;
  }

  .rail-progress {
    height: 46px;
    gap: 5px;
    margin-left: 3px;
    padding-left: 9px;
    font-size: 9.5px;
  }

  .rail-progress b {
    min-width: 38px;
  }
}

@media print {
  .section-rail,
  .rail-progress {
    display: none !important;
  }
}