.if-num { color: #6b7a8d; font-size: 14px; text-align: center; }
.if-sentence {
  background: #fff;
  border-radius: 12px;
  padding: 18px 16px;
  font-size: 18px;
  line-height: 1.7;
  color: #25323f;
  max-width: 420px;
  margin: 8px auto;
  box-shadow: 0 2px 10px rgba(40,60,90,.06);
}
.if-blank {
  display: inline-block;
  min-width: 64px;
  border-bottom: 3px solid #4d96ff;
  color: #4d96ff;
  font-weight: 800;
  text-align: center;
  margin: 0 2px;
}
.if-opts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  max-width: 420px;
  margin: 10px auto;
}
.if-opt {
  padding: 14px 8px;
  font-size: 18px;
  font-weight: 700;
  border: 2px solid #cdd6e2;
  border-radius: 12px;
  background: #fff;
  color: #25323f;
  cursor: pointer;
}
.if-opt.ok { border-color: #1e8449; background: #d6f5dd; color: #1e8449; }
.if-opt.bad { border-color: #c0392b; background: #fde0e0; color: #c0392b; }
.if-opt:disabled { cursor: default; }
.if-opt:active:not(:disabled) { transform: scale(.97); }