.student-answer {
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  background: var(--surface-alt);
}

.student-answer label {
  display: block;
  margin-bottom: 7px;
  color: #334155;
  font-size: 12px;
  font-weight: 800;
}

.student-answer-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.student-answer-parts {
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
}

.student-answer-part {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 8px;
}

.student-answer-part-label {
  color: #334155;
  font-size: 14px;
  font-weight: 800;
}

.student-answer-parts + .student-answer-row {
  grid-template-columns: auto;
  justify-content: start;
}

.student-answer-row:has(.student-answer-explain) {
  grid-template-columns: 148px 148px;
  justify-content: start;
}

.student-answer-row:has(.student-answer-explain) .student-answer-input {
  grid-column: 1 / -1;
}

.student-answer-row .student-answer-check,
.student-answer-row .student-answer-explain {
  width: 100%;
  min-width: 0;
  justify-content: center;
  text-align: center;
}

.student-answer-input {
  width: 100%;
  min-width: 0;
  height: 42px;
  padding: 8px 11px;
  border: 2px solid #cbd5e1;
  border-radius: 9px;
  color: var(--text);
  background: #fff;
  font-size: 17px;
  font-variant-numeric: tabular-nums;
  outline: none;
}

.student-answer-input:focus { border-color: #60a5fa; }
.student-answer-input.correct { border-color: #059669; background: #ecfdf5; }
.student-answer-input.wrong { border-color: #dc2626; background: #fef2f2; }

.student-answer-check {
  min-height: 42px;
  padding: 8px 14px;
  border: 0;
  border-radius: 9px;
  color: #fff;
  background: var(--accent);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.student-answer-feedback {
  min-height: 20px;
  margin-top: 7px;
  font-size: 12px;
  font-weight: 750;
}

.student-answer-feedback.success { color: #047857; }
.student-answer-feedback.error { color: #b91c1c; }

.task-row .student-answer-input {
  height: 34px;
  padding: 4px 10px;
  font-size: 16px;
}

.task-row .student-answer-check,
.task-row .student-answer-explain {
  min-height: 34px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 800;
}

@media (min-width: 721px) {
  .task-row .student-answer-row:has(.student-answer-explain) {
    grid-template-columns: minmax(160px, 220px) auto auto;
    justify-content: start;
  }
  .task-row .student-answer-row:has(.student-answer-explain) .student-answer-input {
    grid-column: auto;
  }
  .task-row .student-answer-row:has(.student-answer-explain) .student-answer-check,
  .task-row .student-answer-row:has(.student-answer-explain) .student-answer-explain {
    width: auto;
  }
}

@media (max-width: 720px) {
  .student-answer-row:has(.student-answer-explain) {
    grid-template-columns: 1fr 1fr;
    justify-content: stretch;
  }
}

@media (max-width: 420px) {
  .student-answer-row { grid-template-columns: 1fr; }
  .student-answer-row:has(.student-answer-explain) { grid-template-columns: 1fr 1fr; }
  .student-answer-row:has(.student-answer-explain) .student-answer-input { grid-column: 1 / -1; }
  .student-answer-check,
  .student-answer-explain { width: 100%; }
}