.code-mcq-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 20px;
}

.code-mcq-option {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 13px;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  transition: border-color .2s, transform .2s, background .2s;
}

.code-mcq-option:hover {
  border-color: var(--violet);
  transform: translateY(-1px);
}

.code-mcq-option > span {
  display: grid;
  place-items: center;
  flex: 0 0 27px;
  width: 27px;
  height: 27px;
  border-radius: 7px;
  background: var(--card);
  font: 500 10px DM Mono, monospace;
}

.code-mcq-option code {
  min-width: 0;
  overflow-wrap: anywhere;
  font: 500 12px DM Mono, monospace;
}

.code-mcq-option.correct {
  border-color: #57b72c;
  background: #eaffdf;
  color: #173d08;
}

.code-mcq-option.wrong {
  border-color: #e45b50;
  background: #fff0ee;
  color: #72180f;
}

.code-mcq-option:disabled { cursor: default; }
.code-mcq-option:disabled:hover { transform: none; }
.solved-token { color: var(--acid); font-weight: 700; }

.code-explanation {
  display: none;
  margin-top: 14px !important;
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  color: var(--ink) !important;
}

.code-explanation.show { display: block; }
.code-explanation.good { border-left: 4px solid #57b72c; }
.code-explanation.bad { border-left: 4px solid #e45b50; }
.code-explanation strong { font-size: 13px; }
.code-explanation p { margin: 5px 0 0; color: var(--muted); font-size: 12px; }
.code-explanation .concept-summary { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.retry-note { color: var(--muted); font-size: 11px; }

@media (max-width: 600px) {
  .code-mcq-options { grid-template-columns: 1fr; }
  .challenge-actions { align-items: center; gap: 15px; }
}