/* ChemicalHelper sister-site toolbar (homepage) */
[data-sister-sites] {
  display: block;
  padding: 12px 14px 0;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.ch-sister-sites {
  --ch-ss-border: #d7e3e1;
  --ch-ss-bg: #f4faf8;
  --ch-ss-card: #ffffff;
  --ch-ss-text: #16332f;
  --ch-ss-muted: #5b726e;
  --ch-ss-accent: #0f766e;
  --ch-ss-accent-soft: #d9f3ef;
  box-sizing: border-box;
  margin: 16px 0 20px;
  padding: 14px 14px 12px;
  border: 1px solid var(--ch-ss-border);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--ch-ss-bg), #fff 70%);
  color: var(--ch-ss-text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}
.ch-sister-sites *,
.ch-sister-sites *::before,
.ch-sister-sites *::after { box-sizing: border-box; }
.ch-sister-sites__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  margin-bottom: 12px;
}
.ch-sister-sites__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.ch-sister-sites__lead {
  margin: 0;
  color: var(--ch-ss-muted);
  font-size: 0.86rem;
  line-height: 1.45;
}
.ch-sister-sites__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 10px;
}
.ch-sister-sites__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 100%;
  padding: 12px;
  border: 1px solid var(--ch-ss-border);
  border-radius: 12px;
  background: var(--ch-ss-card);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.ch-sister-sites__card:hover {
  border-color: #9ec5bf;
  box-shadow: 0 6px 18px rgba(15, 118, 110, 0.08);
  transform: translateY(-1px);
}
.ch-sister-sites__card.is-current {
  border-color: #7db8b0;
  background: var(--ch-ss-accent-soft);
}
.ch-sister-sites__name {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
}
.ch-sister-sites__desc {
  margin: 0;
  flex: 1;
  color: var(--ch-ss-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}
.ch-sister-sites__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 2px;
}
.ch-sister-sites__host {
  color: var(--ch-ss-muted);
  font-size: 0.75rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ch-sister-sites__btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--ch-ss-accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 650;
}
.ch-sister-sites__card.is-current .ch-sister-sites__btn {
  background: #0b5f59;
}
@media (max-width: 560px) {
  .ch-sister-sites { padding: 12px; }
  .ch-sister-sites__grid { grid-template-columns: 1fr; }
}

/* Dark hosts (e.g. Cond / Rxn / IR) */
[data-sister-theme="dark"] .ch-sister-sites,
.ch-sister-sites.ch-sister-sites--dark {
  --ch-ss-border: #2a3542;
  --ch-ss-bg: #152028;
  --ch-ss-card: #1a222c;
  --ch-ss-text: #e8eef4;
  --ch-ss-muted: #9aa8b5;
  --ch-ss-accent: #1a8a7a;
  --ch-ss-accent-soft: #14343a;
}
[data-sister-theme="dark"] .ch-sister-sites__card:hover,
.ch-sister-sites--dark .ch-sister-sites__card:hover {
  border-color: #3d9cf0;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
}