修复选择题弹窗新增题目按钮文字不可见：intro标签选择器误染el-button内span为蓝色(蓝底蓝字)，收窄为直接子级选择器

src/views/components/StepOneChoiceQuestionEditor.vue

@@ -138,7 +138,8 @@ function close(value = false) {
 }
 .choice-editor-intro { display:flex; align-items:center; justify-content:space-between; gap:20px; margin-bottom:18px; padding:15px 17px; border-left:3px solid #1e88e5; background:linear-gradient(90deg,rgba(187, 222, 251, 0.5),transparent); }
 .choice-editor-actions { display:flex; flex-shrink:0; gap:10px; }
-.choice-editor-intro span { color:#1e88e5; font-size:12px; font-weight:800; letter-spacing:.12em; }.choice-editor-intro p { margin:5px 0 0; color:#5a7a9a; line-height:1.6; }
+/* 只命中左上角的 STEP 01 标签，避免染蓝按钮内文字（el-button 文字渲染在 span 中） */
+.choice-editor-intro > div > span { color:#1e88e5; font-size:12px; font-weight:800; letter-spacing:.12em; }.choice-editor-intro p { margin:5px 0 0; color:#5a7a9a; line-height:1.6; }
 .choice-question-list { display:grid; gap:16px; }.choice-question-card { padding:16px; border:1px solid #cfe2f5; border-radius:10px; background:#f0f6fd; }.choice-question-card header { display:flex; align-items:center; gap:9px; margin-bottom:13px; color:#2c4a6a; }.choice-question-number { display:grid; place-items:center; width:28px; height:28px; border-radius:50%; color:#ffffff; background:#1e88e5; font-size:12px; font-weight:900; }.choice-question-remove { margin-left:auto; color:#ff92a5; cursor:pointer; border:0; background:transparent; }.choice-options { display:grid; gap:9px; margin:13px 0 7px; }.choice-option-row { display:grid; grid-template-columns:94px 28px minmax(0,1fr) 52px; align-items:center; gap:8px; }.choice-option-row .el-radio { margin-right:0; color:#2c4a6a; }.choice-option-key { display:grid; place-items:center; width:25px; height:25px; color:#1e88e5; font-weight:900; border:1px solid #cfe2f5; border-radius:5px; }
 @media (max-width:640px) { .choice-editor-intro { align-items:flex-start; flex-direction:column; }.choice-option-row { grid-template-columns:78px 25px minmax(0,1fr); }.choice-option-row > .el-button { grid-column:3; justify-self:end; } }
 </style>

src/views/components/StepOneQuestionBankPicker.vue

@@ -115,7 +115,8 @@ function close(value = false) {
     .el-dialog__footer { padding: 16px 24px; border-top: 1px solid #cfe2f5; }
 }
 .bank-picker-intro { display:flex; align-items:center; justify-content:space-between; gap:20px; margin-bottom:18px; padding:15px 17px; border-left:3px solid #1e88e5; background:linear-gradient(90deg,rgba(187,222,251,.5),transparent); }
-.bank-picker-intro span { color:#1e88e5; font-size:12px; font-weight:800; letter-spacing:.12em; }
+/* 只命中左上角标签，避免染蓝按钮内文字 */
+.bank-picker-intro > div > span { color:#1e88e5; font-size:12px; font-weight:800; letter-spacing:.12em; }
 .bank-picker-intro p { margin:5px 0 0; color:#5a7a9a; line-height:1.6; }
 .bank-picker-count { flex-shrink:0; padding:6px 14px; color:#1e88e5; font-size:13px; font-weight:800; border:1px solid #cfe2f5; border-radius:16px; background:#f0f6fd; }
 .bank-question-list { display:grid; gap:12px; min-height:120px; }