diff --git a/data.db b/data.db
index 41c0d04..a63f63f 100644
Binary files a/data.db and b/data.db differ
diff --git a/main.py b/main.py
index 70b5246..3fa9cc6 100644
--- a/main.py
+++ b/main.py
@@ -3836,7 +3836,11 @@ def merge_project_external_fields(
     item["hanmac_contract_amount"] = normalize_amount(contract_info.get("hanmac_contract_amount"))
     item["billing_contract_amount"] = normalize_amount(billing_summary.get("contract_amount"))
     item["billed_amount"] = normalize_amount(billing_summary.get("billed_amount"))
-    item["collection_balance_amount"] = normalize_amount(billing_summary.get("balance_amount"))
+    # 수금잔액은 원천 balance 합계 대신 계약금액 대비 수금액 차이로 통일 계산한다.
+    computed_collection_balance = contract_amount - collection_amount
+    if abs(computed_collection_balance) < 1:
+        computed_collection_balance = 0.0
+    item["collection_balance_amount"] = computed_collection_balance
     item["latest_billing_date"] = normalize_text(billing_summary.get("latest_billing_date"))
     item["changed_contract_amount"] = latest_changed_contract_amount
     item["changed_contract_date"] = normalize_text(latest_summary_change.get("change_date")) or normalize_text(latest_round_change.get("change_date"))
diff --git a/templates/process_cost.html b/templates/process_cost.html
index 2d077f3..33ae649 100644
--- a/templates/process_cost.html
+++ b/templates/process_cost.html
@@ -511,6 +511,34 @@
         align-items: center;
     }
 
+    .pc-related-head {
+        align-items: center;
+        justify-content: space-between;
+        gap: 10px;
+    }
+
+    .pc-related-head-main {
+        display: flex;
+        align-items: center;
+        gap: 10px;
+        flex: 1 1 auto;
+        min-width: 0;
+        flex-wrap: wrap;
+    }
+
+    .pc-related-form.pc-related-form--inline {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        flex: 1 1 460px;
+        min-width: 0;
+    }
+
+    .pc-related-form.pc-related-form--inline input[type="text"] {
+        flex: 1 1 260px;
+        min-width: 180px;
+    }
+
     .pc-related-list {
         border: 1px solid var(--line);
         border-radius: 10px;
@@ -884,8 +912,15 @@
             </div>
 
             <section class="pc-collapse is-first" id="pcRelatedSection">
-                <div class="pc-collapse-head">
-                    <h3>연계 프로젝트</h3>
+                <div class="pc-collapse-head pc-related-head">
+                    <div class="pc-related-head-main">
+                        <h3>연계 프로젝트</h3>
+                        <div class="pc-related-form pc-related-form--inline">
+                            <input type="text" id="relatedSearchInput" placeholder="추가할 프로젝트 코드/명 검색" {% if not process_cost_selected_code %}disabled{% endif %}>
+                            <button type="button" class="button-secondary" id="relatedSaveButton" {% if not process_cost_selected_code %}disabled{% endif %}>저장</button>
+                            <button type="button" class="button-secondary" id="relatedResetButton" {% if not process_cost_selected_code %}disabled{% endif %}>초기화</button>
+                        </div>
+                    </div>
                     <button type="button" class="pc-collapse-toggle" data-collapse-target="pcRelatedSection" aria-label="연계 프로젝트 접기">
                         <svg viewBox="0 0 24 24" aria-hidden="true">
                             <path d="M6 15l6-6 6 6"></path>
@@ -904,11 +939,6 @@
                             </span>
                         {% endfor %}
                     </div>
-                    <div class="pc-related-form">
-                        <input type="text" id="relatedSearchInput" placeholder="추가할 프로젝트 코드/명 검색" {% if not process_cost_selected_code %}disabled{% endif %}>
-                        <button type="button" class="button-secondary" id="relatedSaveButton" {% if not process_cost_selected_code %}disabled{% endif %}>저장</button>
-                        <button type="button" class="button-secondary" id="relatedResetButton" {% if not process_cost_selected_code %}disabled{% endif %}>초기화</button>
-                    </div>
                     <div class="pc-related-list" id="relatedSuggestList"></div>
                 </div>
             </section>
diff --git a/templates/projects.html b/templates/projects.html
index 4930353..b2db2ed 100644
--- a/templates/projects.html
+++ b/templates/projects.html
@@ -567,7 +567,21 @@
         opacity: 0.72;
     }
 
-    .related-project-tag button {
+    .related-project-open {
+        border: 0;
+        background: transparent;
+        color: inherit;
+        font-size: 12px;
+        font-weight: 800;
+        line-height: 1.1;
+        padding: 0;
+        text-decoration: underline;
+        text-underline-offset: 2px;
+        cursor: pointer;
+    }
+
+    .related-project-tag .related-project-toggle,
+    .related-project-tag [data-remove-related] {
         width: 14px;
         height: 14px;
         min-width: 14px;
@@ -589,7 +603,8 @@
         justify-content: center;
     }
 
-    .related-project-tag button:hover {
+    .related-project-tag .related-project-toggle:hover,
+    .related-project-tag [data-remove-related]:hover {
         transform: none;
         background: rgba(41, 72, 95, 0.14);
     }
@@ -7269,7 +7284,10 @@
             const isInactive = inactiveCodes.has(item.support_dept_code);
             return `
             <span class="related-project-tag${isInactive ? " is-muted" : ""}">
-                ${escapeHtml(item.support_dept_code)} · ${escapeHtml(item.support_dept_name)}
+                <button type="button" class="related-project-open" data-open-related-project="${escapeHtml(item.support_dept_code)}" title="${escapeHtml(item.support_dept_name)}">
+                    ${escapeHtml(item.support_dept_code)}
+                </button>
+                · ${escapeHtml(item.support_dept_name)}
                 <button type="button" class="related-project-toggle" data-toggle-related="${escapeHtml(item.support_dept_code)}" title="${isInactive ? "상세 반영 다시 켜기" : "상세 반영 끄기"}" aria-label="${isInactive ? "상세 반영 다시 켜기" : "상세 반영 끄기"}">${isInactive ? "+" : "-"}</button>
                 <button type="button" data-remove-related="${escapeHtml(item.support_dept_code)}" title="연관 프로젝트 제거" aria-label="연관 프로젝트 제거">×</button>
             </span>
@@ -8671,6 +8689,17 @@
             relatedBarBox.querySelectorAll("[data-remove-related]").forEach((button) => {
                 button.addEventListener("click", () => removeRelatedProject(button.dataset.removeRelated || ""));
             });
+            relatedBarBox.querySelectorAll("[data-open-related-project]").forEach((button) => {
+                button.addEventListener("click", (event) => {
+                    event.preventDefault();
+                    event.stopPropagation();
+                    const code = String(button.dataset.openRelatedProject || "").trim();
+                    if (!code) return;
+                    const targetItem = getAnalysisItem(code);
+                    if (!targetItem) return;
+                    renderAnalysis(targetItem);
+                });
+            });
             relatedBarBox.querySelectorAll("[data-analysis-detail-note]").forEach((inputEl) => {
                 inputEl.addEventListener("focusout", async () => {
                     const baseCode = String(inputEl.dataset.analysisDetailNote || "").trim();