/* ===== 教师 / 学生模式 ===== */
/* 学生模式：隐藏所有参考答案 */
.answer-block,
.teacher-answer {
  display: none;
}

/* 教师模式：显示所有参考答案 */
body.teacher-mode .answer-block,
body.teacher-mode .teacher-answer {
  display: block;
}

.answer-block {
  margin: 16px 0 20px;
  padding: 14px 18px 4px;
  background: #f5fbf8;
  border: 1px solid #d7eee2;
  border-left: 4px solid var(--c-accent, #3eaf7c);
  border-radius: 0 8px 8px 0;
}

.answer-block .answer-title {
  margin: 0 0 10px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-accent-dark, #2f8f65);
}

.answer-block > :last-child {
  margin-bottom: 14px;
}

.answer-block pre.hljs,
.answer-block .sql-example {
  margin: 10px 0;
}

.answer-block p,
.answer-block li {
  font-size: 14px;
}

/* 顶栏切换按钮 */
.teacher-toggle {
  margin-right: 10px;
  padding: 5px 11px;
  border: 1px solid var(--c-border, #eaecef);
  border-radius: 6px;
  background: #fff;
  color: var(--c-text-soft, #4a5b6d);
  font-family: inherit;
  font-size: 13px;
  line-height: 1.5;
  white-space: nowrap;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}

.teacher-toggle:hover {
  color: var(--c-accent, #3eaf7c);
  border-color: var(--c-accent, #3eaf7c);
}

body.teacher-mode .teacher-toggle {
  background: var(--c-accent, #3eaf7c);
  border-color: var(--c-accent, #3eaf7c);
  color: #fff;
}

body.teacher-mode .teacher-toggle:hover {
  background: var(--c-accent-dark, #2f8f65);
  border-color: var(--c-accent-dark, #2f8f65);
  color: #fff;
}

/* 密码弹窗 */
.teacher-dialog {
  width: min(92vw, 380px);
  padding: 0;
  border: 0;
  border-radius: 12px;
  box-shadow: 0 24px 70px rgba(15, 23, 42, .28);
}

.teacher-dialog::backdrop {
  background: rgba(15, 23, 42, .45);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

.teacher-dialog-form {
  padding: 22px;
}

.teacher-dialog-form h2 {
  margin: 0 0 6px;
  padding: 0;
  border: 0;
  font-size: 18px;
}

.teacher-dialog-form p {
  margin: 0 0 12px;
  color: var(--c-text-light, #6b7a8c);
  font-size: 13.5px;
}

.teacher-password {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--c-border, #eaecef);
  border-radius: 7px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
}

.teacher-password:focus {
  border-color: var(--c-accent, #3eaf7c);
  box-shadow: 0 0 0 3px rgba(62, 175, 124, .14);
}

.teacher-dialog-error {
  margin-top: 8px !important;
  color: #c0392b !important;
  font-size: 13px !important;
}

.teacher-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

.teacher-dialog-actions button {
  padding: 7px 14px;
  border: 1px solid var(--c-border, #eaecef);
  border-radius: 6px;
  background: #fff;
  color: var(--c-text, #2c3e50);
  font-family: inherit;
  font-size: 13.5px;
  cursor: pointer;
}

.teacher-dialog-actions button:hover {
  border-color: var(--c-accent, #3eaf7c);
  color: var(--c-accent, #3eaf7c);
}

.teacher-dialog-actions .teacher-confirm {
  background: var(--c-accent, #3eaf7c);
  border-color: var(--c-accent, #3eaf7c);
  color: #fff;
}

.teacher-dialog-actions .teacher-confirm:hover {
  background: var(--c-accent-dark, #2f8f65);
  border-color: var(--c-accent-dark, #2f8f65);
  color: #fff;
}

@media (max-width: 720px) {
  .teacher-toggle {
    margin-right: 6px;
    padding: 5px 8px;
    font-size: 12px;
  }
}