/* Shared series design. Keep this CSS identical across all four Labs.
   The React Labs also share SeriesChrome.tsx; HJB uses static HTML. */
.series-header {
  padding: 22px 0 21px;
  border-bottom: 1px solid #253140;
  scroll-margin-top: 16px;
}
.series-header .series-label,
.series-footer .series-label {
  margin: 0;
  color: #97a5b5;
  font-size: 9px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 1.8px;
}
.series-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 12px;
}
.series-header .series-wordmark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #e8eef5;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 2px;
  white-space: nowrap;
  text-decoration: none;
}
.series-wordmark b {
  color: #65e6d0;
  font-weight: 400;
}
.series-wordmark svg {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  fill: none;
  stroke: #65e6d0;
  stroke-width: 1.3;
}
.series-wordmark svg circle {
  fill: #65e6d0;
  stroke: #0b1017;
}
.series-header-actions {
  display: flex;
  align-items: center;
  gap: 28px;
}
.series-theorem {
  padding: 5px 9px;
  border: 1px solid #253140;
  border-radius: 3px;
  color: #65e6d0;
  font-size: 10px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 1px;
  white-space: nowrap;
}
.series-header .series-about-link {
  color: #aebdcb;
  font-size: 11px;
  text-decoration: none;
  white-space: nowrap;
}
.series-about-link span {
  margin-left: 7px;
  color: #65e6d0;
}
.series-footer {
  display: block;
  padding: 30px 0 32px;
  border-top: 1px solid #253140;
  color: #97a5b5;
  font-size: 11px;
  line-height: 1.9;
}
.series-labs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 17px 0 21px;
  max-width: 1040px;
}
.series-footer .series-lab {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3px 16px;
  align-items: center;
  padding: 13px 16px;
  border: 1px solid #253140;
  border-radius: 5px;
  color: #aebdcb;
  text-decoration: none;
}
.series-lab strong {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.2px;
  line-height: 1.5;
}
.series-lab > span {
  grid-column: 1;
  font-size: 11px;
  line-height: 1.6;
}
.series-lab small {
  grid-column: 2;
  grid-row: 1 / 3;
  font-size: 9px;
  white-space: nowrap;
}
.series-footer .series-lab[aria-current="page"] {
  border-color: #345a53;
  background: #122522;
  color: #65e6d0;
}
.series-footer a.series-lab:hover {
  border-color: #65e6d0;
  color: #65e6d0;
}
.series-footer .series-unavailable {
  color: #8d9aaa;
}
.series-footer .series-description {
  margin: 0 0 13px;
  font-size: 11px;
  line-height: 1.95;
}
.series-footer .series-sources {
  display: inline-block;
  padding: 5px 0;
  color: #c2d1df;
  font-size: 11px;
  text-underline-offset: 4px;
}
.series-sources span {
  margin-left: 8px;
  color: #65e6d0;
}
.series-owner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 23px;
  padding-top: 18px;
  border-top: 1px solid #253140;
  font-size: 10px;
}
.series-owner a {
  color: #aebdcb;
  text-decoration: none;
}
.series-header a:hover,
.series-footer a:hover {
  color: #65e6d0;
}
.series-header a:focus-visible,
.series-footer a:focus-visible {
  outline: 2px solid #65e6d0;
  outline-offset: 4px;
}
#about {
  scroll-margin-top: 20px;
}
@media (max-width: 1100px) {
  .series-labs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 600px) {
  .series-header {
    padding: 18px 0;
  }
  .series-header-row {
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
  }
  .series-header .series-label,
  .series-footer .series-label {
    font-size: 8px;
    letter-spacing: 1.5px;
  }
  .series-header .series-wordmark {
    gap: 8px;
    font-size: 15px;
    letter-spacing: 1.2px;
  }
  .series-wordmark svg {
    flex-basis: 26px;
    width: 26px;
    height: 26px;
  }
  .series-theorem {
    padding: 5px 7px;
    font-size: 8px;
    letter-spacing: 0.5px;
  }
  .series-header .series-about-link {
    display: none;
  }
  .series-footer {
    padding: 24px 0 28px;
  }
  .series-labs {
    grid-template-columns: 1fr;
    gap: 10px;
    margin: 16px 0 20px;
  }
  .series-footer .series-lab {
    min-height: 66px;
    padding: 12px 14px;
  }
  .series-footer .series-sources {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }
  .series-owner {
    gap: 9px;
    margin-top: 17px;
    padding-top: 13px;
  }
  .series-owner a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    min-height: 44px;
  }
}