.cfb-square {
  width: 56px; height: 56px;
  border: 0; border-radius: 18px;
  background: linear-gradient(135deg, #1f1f2e, #15151d);
  color: #cbd5e1;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.06);
  transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.25s, color 0.2s, border-color 0.2s;
}
.cfb-square:hover {
  transform: rotate(-6deg) translateY(-3px);
  color: #a78bfa;
  border-color: rgba(167,139,250,0.4);
  box-shadow: 0 12px 32px rgba(124,108,255,0.3), inset 0 1px 0 rgba(255,255,255,0.08);
}
.cfb-square:active { transform: rotate(0) translateY(0); }
.cfb-square:focus-visible { outline: 2px solid #7c6cff; outline-offset: 3px; }
.cfb-square svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }