diff --git a/html/reg.html b/html/reg.html
index 014ffba..75fbc83 100644
--- a/html/reg.html
+++ b/html/reg.html
@@ -25,6 +25,7 @@
         </div>
         <div class="auth-body">
           <form id="registerForm" autocomplete="off">
+            <input type="hidden" id="inviteCode" name="inviteCode" />
             <div class="form-group" id="nickNameContainer">
               <label for="nickName">昵称</label>
               <input
@@ -651,7 +652,7 @@
           },
           getOptionalGraphVerifyParams(),
         );
-        const inviteCode = AuthPageUtil.getReferralInviteCodeFromUrl();
+        const inviteCode = $("#inviteCode").val().trim();
         if (inviteCode) registerData.inviteCode = inviteCode;
         return registerData;
       }
@@ -720,6 +721,7 @@
 
       layui.use(["layer", "jquery"], function () {
         layerInstance = layui.layer;
+        $("#inviteCode").val(AuthPageUtil.getReferralInviteCodeFromUrl());
         loadVerifyConfig().then(refreshCaptcha);
         $("#sendSmsBtn").on("click", sendSmsCode);
         $("#registerForm").on("submit", function (event) {
diff --git a/html/repwd.html b/html/repwd.html
index a57f081..1a2d681 100644
--- a/html/repwd.html
+++ b/html/repwd.html
@@ -37,7 +37,7 @@
               <div class="error-message" id="phoneError"></div>
             </div>
 
-            <div class="form-group" id="captchaGroup" style="visibility: hidden">
+            <div class="form-group" id="captchaGroup" style="display: none">
               <label for="captchaInput">滑动验证</label>
               <div class="captcha-row">
                 <input
@@ -158,7 +158,6 @@
       }
 
       function refreshCaptcha() {
-        $("#captchaGroup").css("visibility", "visible");
         currentCaptchaId = "";
         currentSlideUuid = "";
         currentSlideX = 0;
@@ -168,8 +167,10 @@
         $("#sendSmsBtn").prop("disabled", false);
         if (currentVerifyType === "slide") {
           renderSlideCaptchaEntry();
+          $("#captchaGroup").hide();
           return;
         }
+        $("#captchaGroup").show();
         $("#captchaInput").show();
         $("#captchaRefreshLink").show().text("看不清？换一张");
         $("#captchaContainer")
@@ -304,6 +305,7 @@
         if (smsCodeIssuedPhone && smsCodeIssuedPhone !== phone) {
           smsCodeIssuedPhone = "";
           $("#smsCode").val("");
+          refreshCaptcha();
         }
       }
 
@@ -482,6 +484,7 @@
           .then(function (res) {
             if (ApiClient.isSuccess(res)) {
               smsCodeIssuedPhone = $("#phone").val().trim();
+              $("#captchaGroup").hide();
               layerInstance.msg("短信验证码已发送", { icon: 1 });
               AuthPageUtil.startSmsCountdown("#sendSmsBtn");
               return;
diff --git a/tmp/referral-register-contract-test.js b/tmp/referral-register-contract-test.js
index 4dcafa9..b1f213d 100644
--- a/tmp/referral-register-contract-test.js
+++ b/tmp/referral-register-contract-test.js
@@ -26,6 +26,9 @@ vm.runInNewContext(`${authSource}\nthis.AuthPageUtilForTest = AuthPageUtil;`, co
 
 assert.strictEqual(context.AuthPageUtilForTest.getReferralInviteCodeFromUrl(), "invite-001");
 assert.strictEqual(context.AuthPageUtilForTest.getReferralInviteCodeFromUrl("?referralCode=legacy"), "");
+assert(register.includes('type="hidden" id="inviteCode" name="inviteCode"'));
+assert(register.includes('$("#inviteCode").val(AuthPageUtil.getReferralInviteCodeFromUrl());'));
+assert(register.includes('const inviteCode = $("#inviteCode").val().trim();'));
 assert(register.includes("registerData.inviteCode = inviteCode"), "registration must send a non-empty inviteCode");
 assert(register.includes('$("#captchaGroup").hide();'), "registration verification must hide after SMS is sent");
 assert(register.includes('$("#captchaGroup").show();'), "registration verification must return after the phone changes");
@@ -36,7 +39,10 @@ assert(usercenter.includes("ApiClient.API.referralBind, { inviteCode: inviteCode
 assert(promo.includes("NavigationUtil.referralRegisterUrl"), "promotion page must normalize returned links to registration");
 assert(login.includes('id="captchaGroup" style="display: none"'));
 assert(login.includes('$("#captchaGroup").show();'));
-[register, resetPassword].forEach(function (page) {
+assert(resetPassword.includes('id="captchaGroup" style="display: none"'));
+assert(resetPassword.includes('$("#captchaGroup").hide();'));
+assert(resetPassword.includes('$("#captchaGroup").show();'));
+[register].forEach(function (page) {
   assert(page.includes('id="captchaGroup" style="visibility: hidden"'));
   assert(page.includes('$("#captchaGroup").css("visibility", "visible");'));
 });