/* Không gian làm việc theo vai (workspace.js). !important vì các module tự bật/tắt [hidden] của nút. */
body.ws-learning #examLauncher,
body.ws-learning #vExamAdd,
body.ws-learning .ex-btn{display:none !important;}
body.ws-explaining #studyGroupLauncher,
body.ws-explaining .rate-box{display:none !important;}

/* Hộp hỏi vai — bắt buộc, không có nút đóng */
.ws-card{max-width:440px;}
.ws-choices{display:flex; flex-direction:column; gap:10px; margin:16px 0 4px;}
.ws-choice{
  display:flex; flex-direction:column; gap:4px; width:100%; padding:14px 16px; text-align:left;
  border:1px solid var(--line-strong); border-radius:var(--radius-lg, 12px); background:var(--surface);
  font:inherit; color:var(--ink); cursor:pointer;
}
.ws-choice:hover, .ws-choice:focus-visible{border-color:var(--accent); background:var(--accent-soft); outline:none;}
.ws-choice:disabled{opacity:.6; cursor:wait;}
.ws-choice b{font-size:1rem;}
.ws-choice span{font-size:.84rem; line-height:1.5; color:var(--ink-soft);}
.ws-err{margin:8px 0 0; font-size:.82rem; color:var(--danger, #b42318);}
.ws-err[hidden]{display:none;}