修改功能，现已测试注册登录忘记密码

public/css/auth.css

@@ -517,6 +517,104 @@ body:has(.auth-container) {
   background: linear-gradient(135deg, #27ae60, #1a8f50);
 }
 
+/* === Captcha Dialog ======================================== */
+.captcha-dialog {
+  padding: 24px;
+  color: var(--text-dark, #1a1a2e);
+}
+
+.captcha-dialog-title {
+  font-size: 18px;
+  font-weight: 800;
+  line-height: 1.3;
+}
+
+.captcha-dialog-desc {
+  margin-top: 8px;
+  font-size: 13px;
+  line-height: 1.6;
+  color: var(--text-muted, #6b7280);
+}
+
+.captcha-dialog-row {
+  display: flex;
+  gap: 10px;
+  align-items: center;
+  margin-top: 18px;
+}
+
+.captcha-dialog-input {
+  flex: 1;
+  min-width: 0;
+  height: 44px;
+  padding: 0 12px;
+  border: 1px solid var(--border-light, #e5e7eb);
+  border-radius: var(--radius-md, 10px);
+  font-size: 14px;
+  outline: none;
+  transition: border-color 0.2s ease, box-shadow 0.2s ease;
+}
+
+.captcha-dialog-input:focus {
+  border-color: var(--primary, #102b6a);
+  box-shadow: 0 0 0 3px rgba(16, 43, 106, 0.08);
+}
+
+.captcha-dialog-img-box {
+  width: 120px;
+  height: 44px;
+  border: 1px solid var(--border-light, #e5e7eb);
+  border-radius: var(--radius-md, 10px);
+  overflow: hidden;
+  cursor: pointer;
+  background: var(--bg-light, #f4f6fb);
+  flex: 0 0 120px;
+}
+
+.captcha-dialog-img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
+}
+
+.captcha-dialog-tip {
+  margin-top: 10px;
+  font-size: 12px;
+  color: var(--text-muted, #6b7280);
+}
+
+.captcha-dialog-tip span {
+  color: var(--primary, #102b6a);
+  cursor: pointer;
+  font-weight: 700;
+}
+
+.captcha-dialog-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 10px;
+  margin-top: 22px;
+}
+
+.captcha-dialog-btn {
+  min-width: 84px;
+  height: 38px;
+  border: 1px solid var(--border-light, #e5e7eb);
+  border-radius: var(--radius-md, 10px);
+  background: #ffffff;
+  color: var(--text-dark, #1a1a2e);
+  font-size: 13px;
+  font-weight: 700;
+  cursor: pointer;
+}
+
+.captcha-dialog-btn.primary {
+  border-color: transparent;
+  background: linear-gradient(135deg, var(--primary, #102b6a), var(--primary-light, #1a3f8f));
+  color: #ffffff;
+}
+
 /* === Submit Button ========================================= */
 .auth-submit-btn {
   width: 100%;