.feature-center {
  --fc-bg: var(--theme-surface, #f5fbff);
  --fc-card: var(--theme-input, #fff);
  --fc-line: var(--theme-line, #bfdde8);
  --fc-text: var(--theme-text, #244d68);
  --fc-muted: var(--theme-muted, #617e91);
  margin: 24px 0 32px;
  padding: clamp(16px, 2vw, 26px);
  border: 1px solid var(--fc-line);
  border-radius: 24px;
  background: var(--fc-bg);
  color: var(--fc-text);
  min-width: 0;
  scroll-margin-top: 96px;
}
.feature-center * { box-sizing: border-box; }
.fc-heading { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 16px; }
.fc-heading h2 { margin: 0; color: var(--fc-text); font-size: clamp(22px, 2.5vw, 30px); line-height: 1.2; letter-spacing: -.025em; }
.fc-catalog-switch { flex: none; }
.fc-catalog-switch > .button { min-height: 40px; padding: 8px 14px; border: 1px solid var(--fc-line); border-radius: 12px; background: var(--fc-card); color: var(--fc-text); box-shadow: none; white-space: normal; font-size: 12px; }
.fc-status-note, .fc-update, .fc-footnote { color: var(--fc-muted); font-size: 12px; line-height: 1.65; }
.fc-status-note { margin: 8px 0 14px; }
.fc-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: start; gap: 12px; min-width: 0; }
.fc-column { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.fc-card { display: flex; flex-direction: column; min-width: 0; padding: 16px; border: 1px solid var(--fc-line); border-radius: 18px; background: var(--fc-card); color: var(--fc-text); box-shadow: 0 3px 0 #286b870b; }
.fc-column > .fc-card { flex: none; }
.fc-card-heading { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 10px; align-items: center; min-height: 48px; margin-bottom: 9px; min-width: 0; }
.fc-card-object { display: block; width: 48px; height: 48px; object-fit: contain; }
.fc-card h4 { margin: 0; color: var(--fc-text); font-size: 16px; line-height: 1.3; overflow-wrap: anywhere; }
.fc-description { margin: 0 0 12px; color: var(--fc-muted); font-size: 12px; line-height: 1.5; }
.fc-availability { display: flex; flex-wrap: wrap; align-items: start; gap: 6px; margin-top: auto; }
.fc-state { display: inline-block; max-width: 100%; border: 1px solid var(--fc-line); border-radius: 6px; padding: 3px 6px; background: var(--theme-raised, #eaf2f7); color: var(--fc-text); font-size: 10px; line-height: 1.4; font-weight: 650; overflow-wrap: anywhere; }
.fc-state[data-feature-state=available] { background: var(--theme-success, #e3f3ed); border-color: #7bbaa0; }
.fc-state[data-feature-state=devnet_only] { background: var(--theme-warm, #fff5d9); border-color: var(--theme-gold, #d9bd75); }
.fc-state[data-feature-state=unavailable] { background: var(--theme-error, #fff0ed); border-color: #c2918d; }
.fc-requirement, .fc-network, .fc-reason { color: var(--fc-muted); margin: 0 0 10px; font-size: 11px; line-height: 1.7; overflow-wrap: anywhere; }
.fc-card > .fc-link { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; margin-top: 12px; padding: 10px 12px; border: 1px solid var(--fc-line); border-radius: 11px; background: var(--theme-raised, #eaf5fb); color: var(--theme-cyan, #1d779b); font-size: 12px; font-weight: 750; line-height: 1.5; text-decoration: none; }
.fc-card > .fc-link:hover { border-color: var(--theme-cyan, #1d779b); }
.fc-card details { min-width: 0; margin: 10px 0 0; padding: 0; border: 0; border-top: 1px solid var(--fc-line); border-radius: 0; background: transparent; }
.fc-card summary, .fc-source > summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 44px; padding: 10px 0; list-style: none; cursor: pointer; color: var(--fc-muted); font-size: 11px; line-height: 1.5; font-weight: 650; }
.fc-card summary::-webkit-details-marker, .fc-source > summary::-webkit-details-marker { display: none; }
.fc-card summary::after, .fc-source > summary::after { content: '+'; display: grid; place-items: center; flex: 0 0 14px; width: 14px; height: 14px; color: var(--theme-cyan, #1d779b); font-size: 14px; line-height: 1; }
.fc-card details[open] > summary::after, .fc-source[open] > summary::after { content: '−'; }
.fc-expanded { display: flow-root; min-width: 0; }
.fc-card ol { margin: 0; padding: 0 0 12px 18px; color: var(--fc-muted); font-size: 11px; line-height: 1.75; }
.fc-card li + li { margin-top: 6px; }
.fc-sample-note { margin: 0 0 6px; color: var(--fc-muted); font-size: 11px; line-height: 1.7; }
.fc-sample-link { display: inline-flex; align-items: center; min-height: 44px; max-width: 100%; color: var(--theme-cyan, #1d779b); font-size: 11px; font-weight: 700; line-height: 1.6; overflow-wrap: anywhere; }
.fc-filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 18px; }
.fc-filters button { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; max-width: 100%; padding: 9px 12px; border: 1px solid var(--fc-line); border-radius: 12px; background: var(--fc-card); color: var(--fc-text); font: 650 12px/1.5 var(--body, inherit); cursor: pointer; text-align: left; white-space: normal; overflow-wrap: anywhere; }
.fc-filters button[aria-pressed=true] { background: var(--theme-gold, #f5d481); border-color: var(--theme-gold, #d9b75c); color: #3f351d; }
.fc-filters button > span { flex: none; padding: 1px 5px; border-radius: 5px; background: #48667512; font-size: 10px; }
.fc-group { min-width: 0; padding-top: 12px; }
.fc-group + .fc-group { margin-top: 22px; }
.fc-group-heading { display: flex; align-items: center; gap: 10px; min-width: 0; margin-bottom: 12px; }
.fc-group-heading img { flex: none; width: 40px; height: 40px; object-fit: contain; }
.fc-group-heading h3 { margin: 0; color: var(--fc-text); font-size: 20px; line-height: 1.35; }
.fc-source { margin: 16px 0 0; padding: 0; border: 0; border-top: 1px solid var(--fc-line); border-radius: 0; background: transparent; }
.fc-source > summary { padding-bottom: 0; }
.fc-source[open] > summary { padding-bottom: 10px; }
.fc-source > .button { min-height: 44px; margin: 6px 0 10px; }
.fc-update { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 0 0 12px; font-size: 11px; }
.fc-update time { font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.fc-footnote { margin: 0; }
.feature-center :focus-visible { outline: 3px solid var(--theme-cyan, #2782a8); outline-offset: 3px; }
.fc-sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* A quick choice is one large, always-visible action. Its destination keeps the full review. */
.feature-center[data-fc-mode=quick] .fc-card { padding: 0; overflow: visible; background: linear-gradient(130deg, var(--fc-card) 70%, var(--theme-raised, #eaf5fb)); }
.feature-center[data-fc-mode=quick] .fc-quick-link { display: grid; gap: 5px; align-content: start; justify-content: stretch; min-height: 132px; height: 100%; margin: 0; padding: 12px 14px; border: 0; border-radius: 17px; background: transparent; text-align: left; }
.feature-center[data-fc-mode=quick] .fc-quick-link:hover { background: var(--theme-raised, #eaf5fb); }
.feature-center[data-fc-mode=quick] .fc-card-heading { min-height: 48px; grid-template-columns: 48px minmax(0, 1fr); gap: 9px; margin: 0; }
.feature-center[data-fc-mode=quick] .fc-card-object { width: 48px; height: 48px; }
.feature-center[data-fc-mode=quick] .fc-card h4 { font-size: 16px; line-height: 1.25; }
.feature-center[data-fc-mode=quick] .fc-description { min-height: 36px; margin: 0; font-size: 12px; font-weight: 500; line-height: 1.5; }
.fc-quick-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-width: 0; }
.fc-quick-footer .fc-state { max-width: calc(100% - 42px); padding: 2px 5px; font-size: 9px; }
.fc-open-label { flex: none; color: var(--theme-cyan, #1d779b); font-size: 12px; line-height: 1.7; font-weight: 800; }

@media (max-width:1000px) {
  .fc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fc-card { padding: 14px; }
}
@media (max-width:600px) {
  .feature-center { margin: 18px 0 24px; padding: 13px; border-radius: 20px; scroll-margin-top: 82px; }
  .fc-heading { align-items: flex-start; gap: 10px; margin-bottom: 12px; }
  .fc-heading h2 { font-size: 23px; }
  .fc-catalog-switch { max-width: 52%; }
  .fc-catalog-switch > .button { min-height: 44px; padding: 7px 10px; font-size: 11px; }
  .fc-grid { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .fc-column { gap: 10px; }
  .fc-card-heading { grid-template-columns: 44px minmax(0, 1fr); }
  .fc-card-object { width: 44px; height: 44px; }
  .fc-filters { gap: 7px; }
  .fc-filters button { min-height: 44px; padding: 8px 10px; font-size: 11px; }
  .fc-group-heading h3 { font-size: 19px; }
  .fc-update { display: grid; gap: 3px; }
  .fc-source { margin-top: 12px; }
}