/* 空当接龙 */
.fc-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem .8rem}
.fc-opt{display:flex;align-items:center;gap:.4rem}
.fc-opt label{margin:0;color:#8a9199;font-size:.8125rem}
.fc-switch{margin:0;padding-left:2.4rem}
.fc-switch .form-check-label{font-size:.8125rem;color:#5b6675}

.fc-stage{position:relative;margin-top:.9rem}
.fc-scroll{overflow-x:auto;overflow-y:hidden;padding-bottom:.3rem}
.fc-board{position:relative;margin:0 auto}
.fc-slot{position:absolute;border-radius:.42rem;border:1px dashed rgba(255,255,255,.45);background:rgba(15,23,42,.35)}
.fc-slot.is-found{display:flex;align-items:center;justify-content:center}
.fc-suit-mark{font-size:1.5em;line-height:1;opacity:.32}
.fc-lane{position:absolute;border-radius:.5rem}
.fc-lane.is-drop{background:rgba(14,165,233,.18);box-shadow:inset 0 0 0 2px #38bdf8}
.fc-card{position:absolute;left:0;top:0;border-radius:.42rem;background:#fff;
  box-shadow:0 1px 2px rgba(15,23,42,.3),inset 0 0 0 1px rgba(148,163,184,.5);
  transition:transform .15s ease-out;cursor:pointer;user-select:none;-webkit-user-select:none;
  overflow:hidden;touch-action:none}
.fc-card.is-red{color:#dc2626}
.fc-card.is-black{color:#1f2937}
.fc-card .fc-rank{position:absolute;left:.16em;top:.06em;font-weight:800;font-size:1em;line-height:1.1}
.fc-card .fc-suit{position:absolute;left:.22em;top:1.2em;font-size:.85em;line-height:1}
.fc-card .fc-big{position:absolute;left:50%;top:56%;transform:translate(-50%,-50%);font-size:1.6em;opacity:.9}
.fc-card.is-sel{box-shadow:0 0 0 3px #0ea5e9,0 2px 6px rgba(15,23,42,.35)}
.fc-card.is-drag{z-index:999;transition:none;box-shadow:0 10px 20px rgba(15,23,42,.4)}
.fc-slot.is-drop{background:rgba(14,165,233,.35);border-color:#38bdf8}

.fc-overlay{position:absolute;inset:0;z-index:1000;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:.5rem;padding:1rem;text-align:center;color:#fff;background:rgba(15,23,42,.74);border-radius:.6rem}
.fc-overlay.is-off{display:none}
.fc-overlay-title{font-size:1.3rem;font-weight:700}
.fc-overlay-sub{max-width:20rem;font-size:.8125rem;line-height:1.65;color:rgba(255,255,255,.82)}

.fc-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.5rem;margin-top:.9rem}
.fc-stat{padding:.5rem .35rem;border:1px solid #eef1f5;border-radius:.6rem;background:#fafbfd;text-align:center}
.fc-stat b{display:block;color:var(--site-primary,#0f172a);font-size:1.05rem;line-height:1.3;font-variant-numeric:tabular-nums}
.fc-stat span{display:block;margin-top:.1rem;color:#8a9199;font-size:.6875rem}

.fc-help{display:grid;gap:.6rem;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr))}
.fc-help-item{padding:.65rem .75rem;border:1px solid #eef1f5;border-radius:.6rem;background:#fafbfd}
.fc-help-item b{display:block;margin-bottom:.25rem;color:#1f2d3d;font-size:.875rem}
.fc-help-item b i{color:var(--site-primary,#334155)}
.fc-help-item span{display:block;color:#66707d;font-size:.8125rem;line-height:1.7}