.focus-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.focus-nav button {
  border: 0;
  background: transparent;
  color: var(--green);
  font-size: 13px;
  min-height: 42px;
  padding: 8px 12px;
  border-radius: 7px;
}
.focus-nav button:not(:disabled):hover { background: #e9f1e9; }
.focus-nav button:disabled { color: #a6b0a7; opacity: .55; }
.focus-nav #exit-focus { font-size: 11px; color: #859187; }

.focus-mode .sidebar,
.focus-mode .topbar,
.focus-mode .page-heading,
.focus-mode .stat-strip,
.focus-mode .study-aside,
.focus-mode .page-footer,
.focus-mode .question-top,
.focus-mode .choice-help,
.focus-mode .review-notice,
.focus-mode .source-caption,
.focus-mode .keyboard-hint { display: none !important; }
.focus-mode main { margin-left: 0; }
.focus-mode .main-content { max-width: 790px; padding: 25px 26px 50px; }
.focus-mode .study-layout { display: block; }
.focus-mode .question-card { padding: 35px 39px; box-shadow: 0 8px 35px #263e3308; }
.focus-mode h2#question-stem { margin: 0 0 28px; font-size: 20px; line-height: 1.9; }
.focus-mode .question-footer { justify-content: flex-end; }

@media (max-width: 620px) {
  .focus-mode .main-content { padding: 14px 14px 36px; }
  .focus-mode .focus-nav { margin-bottom: 12px; }
  .focus-mode .focus-nav button { font-size: 12px; padding: 8px 5px; }
  .focus-mode .focus-nav #exit-focus { font-size: 10px; }
  .focus-mode .question-card { padding: 24px 18px; }
  .focus-mode h2#question-stem { font-size: 18px; margin-bottom: 24px; }
}