diff --git a/system1-factory/web/js/admin-settings.js b/system1-factory/web/js/admin-settings.js
index a2cdcbe..d157bcb 100644
--- a/system1-factory/web/js/admin-settings.js
+++ b/system1-factory/web/js/admin-settings.js
@@ -537,35 +537,7 @@ function handleLogout() {
   }
 }
 
-// ========== 토스트 알림 ========== //
-function showToast(message, type = 'info', duration = 3000) {
-  if (!elements.toastContainer) return;
-  
-  const toast = document.createElement('div');
-  toast.className = `toast ${type}`;
-  
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-  
-  toast.innerHTML = `
-    <div class="toast-icon">${iconMap[type] || 'ℹ️'}</div>
-    <div class="toast-message">${message}</div>
-    <button class="toast-close" onclick="this.parentElement.remove()">×</button>
-  `;
-  
-  elements.toastContainer.appendChild(toast);
-  
-  // 자동 제거
-  setTimeout(() => {
-    if (toast.parentElement) {
-      toast.remove();
-    }
-  }, duration);
-}
+// showToast → api-base.js 전역 사용
 
 // ========== 전역 함수 (HTML에서 호출) ========== //
 window.editUser = editUser;
diff --git a/system1-factory/web/js/api-base.js b/system1-factory/web/js/api-base.js
index 87d62cc..fb4952a 100644
--- a/system1-factory/web/js/api-base.js
+++ b/system1-factory/web/js/api-base.js
@@ -148,5 +148,88 @@
     return response.json();
   };
 
+  // ==================== 공통 유틸리티 ====================
+
+  /**
+   * Toast 알림 표시
+   */
+  window.showToast = function(message, type, duration) {
+    type = type || 'info';
+    duration = duration || 3000;
+
+    var container = document.getElementById('toastContainer');
+    if (!container) {
+      container = document.createElement('div');
+      container.id = 'toastContainer';
+      container.style.cssText = 'position:fixed;top:20px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:10px;';
+      document.body.appendChild(container);
+    }
+
+    if (!document.getElementById('toastStyles')) {
+      var style = document.createElement('style');
+      style.id = 'toastStyles';
+      style.textContent =
+        '.toast{display:flex;align-items:center;gap:12px;padding:12px 20px;background:#fff;border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,.15);opacity:0;transform:translateX(100px);transition:all .3s ease;min-width:250px;max-width:400px}' +
+        '.toast.show{opacity:1;transform:translateX(0)}' +
+        '.toast-success{border-left:4px solid #10b981}.toast-error{border-left:4px solid #ef4444}' +
+        '.toast-warning{border-left:4px solid #f59e0b}.toast-info{border-left:4px solid #3b82f6}' +
+        '.toast-icon{font-size:20px}.toast-message{font-size:14px;color:#374151}';
+      document.head.appendChild(style);
+    }
+
+    var iconMap = { success: '\u2705', error: '\u274C', warning: '\u26A0\uFE0F', info: '\u2139\uFE0F' };
+    var toast = document.createElement('div');
+    toast.className = 'toast toast-' + type;
+    toast.innerHTML = '<span class="toast-icon">' + (iconMap[type] || '\u2139\uFE0F') + '</span><span class="toast-message">' + message + '</span>';
+    container.appendChild(toast);
+
+    setTimeout(function() { toast.classList.add('show'); }, 10);
+    setTimeout(function() {
+      toast.classList.remove('show');
+      setTimeout(function() { toast.remove(); }, 300);
+    }, duration);
+  };
+
+  /**
+   * 날짜를 YYYY-MM-DD 형식으로 변환
+   */
+  window.formatDate = function(dateString) {
+    if (!dateString) return '';
+    if (/^\d{4}-\d{2}-\d{2}$/.test(dateString)) return dateString;
+    var d = new Date(dateString);
+    if (isNaN(d.getTime())) return '';
+    var y = d.getFullYear();
+    var m = String(d.getMonth() + 1).padStart(2, '0');
+    var day = String(d.getDate()).padStart(2, '0');
+    return y + '-' + m + '-' + day;
+  };
+
+  /**
+   * apiCall이 로드될 때까지 대기
+   */
+  window.waitForApi = function(timeout) {
+    timeout = timeout || 5000;
+    return new Promise(function(resolve, reject) {
+      if (window.apiCall) return resolve();
+      var elapsed = 0;
+      var iv = setInterval(function() {
+        elapsed += 50;
+        if (window.apiCall) { clearInterval(iv); resolve(); }
+        else if (elapsed >= timeout) { clearInterval(iv); reject(new Error('apiCall timeout')); }
+      }, 50);
+    });
+  };
+
+  /**
+   * UUID v4 생성
+   */
+  window.generateUUID = function() {
+    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
+      var r = Math.random() * 16 | 0;
+      var v = c === 'x' ? r : (r & 0x3 | 0x8);
+      return v.toString(16);
+    });
+  };
+
   console.log('API 설정 완료:', window.API_BASE_URL);
 })();
diff --git a/system1-factory/web/js/daily-work-report/utils.js b/system1-factory/web/js/daily-work-report/utils.js
index c6c4db8..2d96e2a 100644
--- a/system1-factory/web/js/daily-work-report/utils.js
+++ b/system1-factory/web/js/daily-work-report/utils.js
@@ -425,40 +425,7 @@ window.updateProgressSteps = function(currentStepNumber) {
   }
 };
 
-// 토스트 메시지 (간단 버전)
-window.showToast = function(message, type = 'info', duration = 3000) {
-  console.log(`[Toast] ${type}: ${message}`);
-
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast-message');
-  if (existingToast) {
-    existingToast.remove();
-  }
-
-  // 새 토스트 생성
-  const toast = document.createElement('div');
-  toast.className = `toast-message toast-${type}`;
-  toast.textContent = message;
-  toast.style.cssText = `
-    position: fixed;
-    bottom: 20px;
-    right: 20px;
-    padding: 12px 20px;
-    border-radius: 8px;
-    color: white;
-    font-size: 14px;
-    z-index: 10000;
-    animation: slideIn 0.3s ease;
-    background-color: ${type === 'success' ? '#10b981' : type === 'error' ? '#ef4444' : type === 'warning' ? '#f59e0b' : '#3b82f6'};
-  `;
-
-  document.body.appendChild(toast);
-
-  setTimeout(() => {
-    toast.style.animation = 'slideOut 0.3s ease';
-    setTimeout(() => toast.remove(), 300);
-  }, duration);
-};
+// showToast → api-base.js 전역 사용
 
 // 확인 다이얼로그
 window.showConfirmDialog = function(message, onConfirm, onCancel) {
diff --git a/system1-factory/web/js/department-management.js b/system1-factory/web/js/department-management.js
index 5207204..e159574 100644
--- a/system1-factory/web/js/department-management.js
+++ b/system1-factory/web/js/department-management.js
@@ -7,21 +7,11 @@ let selectedWorkers = new Set();
 
 // 페이지 초기화
 document.addEventListener('DOMContentLoaded', async () => {
-  await waitForApiConfig();
+  await waitForApi();
   await loadDepartments();
 });
 
-// API 설정 로드 대기
-async function waitForApiConfig() {
-  let retryCount = 0;
-  while (!window.apiCall && retryCount < 50) {
-    await new Promise(resolve => setTimeout(resolve, 100));
-    retryCount++;
-  }
-  if (!window.apiCall) {
-    console.error('API 설정 로드 실패');
-  }
-}
+// waitForApi → api-base.js 전역 사용
 
 // 부서 목록 로드
 async function loadDepartments() {
diff --git a/system1-factory/web/js/equipment-detail.js b/system1-factory/web/js/equipment-detail.js
index 6080674..3135205 100644
--- a/system1-factory/web/js/equipment-detail.js
+++ b/system1-factory/web/js/equipment-detail.js
@@ -33,24 +33,14 @@ document.addEventListener('DOMContentLoaded', () => {
   }
 
   // API 설정 후 데이터 로드
-  waitForApiConfig().then(() => {
+  waitForApi().then(() => {
     loadEquipmentData();
     loadFactories();
     loadRepairCategories();
   });
 });
 
-// API 설정 대기
-function waitForApiConfig() {
-  return new Promise(resolve => {
-    const check = setInterval(() => {
-      if (window.API_BASE_URL) {
-        clearInterval(check);
-        resolve();
-      }
-    }, 50);
-  });
-}
+// waitForApi → api-base.js 전역 사용
 
 // 뒤로가기
 function goBack() {
diff --git a/system1-factory/web/js/group-leader-dashboard.js b/system1-factory/web/js/group-leader-dashboard.js
index 0b1c01a..6b708b2 100644
--- a/system1-factory/web/js/group-leader-dashboard.js
+++ b/system1-factory/web/js/group-leader-dashboard.js
@@ -138,14 +138,7 @@ function renderWorkStatus(workers) {
   container.innerHTML = html;
 }
 
-// 🍞 토스트 메시지 (기존 modern-dashboard.js에 있다면 중복 주의, 없으면 사용)
-function showToast(message, type = 'info') {
-  if (window.showToast) {
-    window.showToast(message, type);
-  } else {
-    alert(message);
-  }
-}
+// showToast → api-base.js 전역 사용
 
 // 초기화
 document.addEventListener('DOMContentLoaded', () => {
diff --git a/system1-factory/web/js/manage-user.js b/system1-factory/web/js/manage-user.js
index 1633156..f976cfd 100644
--- a/system1-factory/web/js/manage-user.js
+++ b/system1-factory/web/js/manage-user.js
@@ -300,22 +300,7 @@ async function loadWorkerOptions() {
   }
 }
 
-function showToast(message) {
-  const toast = document.createElement('div');
-  toast.textContent = message;
-  toast.style.position = 'fixed';
-  toast.style.bottom = '30px';
-  toast.style.left = '50%';
-  toast.style.transform = 'translateX(-50%)';
-  toast.style.background = '#323232';
-  toast.style.color = '#fff';
-  toast.style.padding = '10px 20px';
-  toast.style.borderRadius = '6px';
-  toast.style.fontSize = '14px';
-  toast.style.zIndex = 9999;
-  document.body.appendChild(toast);
-  setTimeout(() => toast.remove(), 2000);
-}
+// showToast → api-base.js 전역 사용
 
 // ========== 페이지 접근 권한 관리 ==========
 
diff --git a/system1-factory/web/js/mobile-dashboard.js b/system1-factory/web/js/mobile-dashboard.js
index 2283513..c81f749 100644
--- a/system1-factory/web/js/mobile-dashboard.js
+++ b/system1-factory/web/js/mobile-dashboard.js
@@ -18,21 +18,7 @@
   var workplacesByCategory = {};
 
   // ==================== 유틸리티 ====================
-
-  // escapeHtml은 api-base.js에서 window.escapeHtml로 전역 제공
-
-  function waitForApi(timeout) {
-    timeout = timeout || 5000;
-    return new Promise(function(resolve, reject) {
-      if (window.apiCall) return resolve();
-      var elapsed = 0;
-      var interval = setInterval(function() {
-        elapsed += 50;
-        if (window.apiCall) { clearInterval(interval); resolve(); }
-        else if (elapsed >= timeout) { clearInterval(interval); reject(new Error('apiCall timeout')); }
-      }, 50);
-    });
-  }
+  // escapeHtml, waitForApi → api-base.js 전역 사용
 
   // ==================== 데이터 그룹핑 ====================
 
diff --git a/system1-factory/web/js/modern-dashboard.js b/system1-factory/web/js/modern-dashboard.js
index f25cbb6..d3acd5b 100644
--- a/system1-factory/web/js/modern-dashboard.js
+++ b/system1-factory/web/js/modern-dashboard.js
@@ -806,35 +806,7 @@ function showErrorState() {
   }
 }
 
-// ========== 토스트 알림 ========== //
-function showToast(message, type = 'info', duration = 3000) {
-  if (!elements.toastContainer) return;
-  
-  const toast = document.createElement('div');
-  toast.className = `toast ${type}`;
-  
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-  
-  toast.innerHTML = `
-    <div class="toast-icon">${iconMap[type] || 'ℹ️'}</div>
-    <div class="toast-message">${message}</div>
-    <button class="toast-close" onclick="this.parentElement.remove()">×</button>
-  `;
-  
-  elements.toastContainer.appendChild(toast);
-  
-  // 자동 제거
-  setTimeout(() => {
-    if (toast.parentElement) {
-      toast.remove();
-    }
-  }, duration);
-}
+// showToast → api-base.js 전역 사용
 
 // ========== 작업자 관련 액션 함수들 ========== //
 function openWorkerModal(workerId, workerName) {
@@ -1388,7 +1360,6 @@ async function handleModalVacation(vacationType) {
 
 // ========== 전역 함수 (HTML에서 호출) ========== //
 window.loadDashboardData = loadDashboardData;
-window.showToast = showToast;
 window.updateSummaryCards = updateSummaryCards;
 window.displayWorkers = displayWorkers;
 window.openWorkerModal = openWorkerModal;
diff --git a/system1-factory/web/js/project-management.js b/system1-factory/web/js/project-management.js
index 4540d77..42ac7d6 100644
--- a/system1-factory/web/js/project-management.js
+++ b/system1-factory/web/js/project-management.js
@@ -557,59 +557,7 @@ async function deleteProjectById(projectId) {
   }
 }
 
-// 토스트 메시지 표시
-function showToast(message, type = 'info') {
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast');
-  if (existingToast) {
-    existingToast.remove();
-  }
-  
-  // 새 토스트 생성
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-  
-  // 스타일 적용
-  Object.assign(toast.style, {
-    position: 'fixed',
-    top: '20px',
-    right: '20px',
-    padding: '12px 24px',
-    borderRadius: '8px',
-    color: 'white',
-    fontWeight: '500',
-    zIndex: '1000',
-    transform: 'translateX(100%)',
-    transition: 'transform 0.3s ease'
-  });
-  
-  // 타입별 배경색
-  const colors = {
-    success: '#10b981',
-    error: '#ef4444',
-    warning: '#f59e0b',
-    info: '#3b82f6'
-  };
-  toast.style.backgroundColor = colors[type] || colors.info;
-  
-  document.body.appendChild(toast);
-  
-  // 애니메이션
-  setTimeout(() => {
-    toast.style.transform = 'translateX(0)';
-  }, 100);
-  
-  // 자동 제거
-  setTimeout(() => {
-    toast.style.transform = 'translateX(100%)';
-    setTimeout(() => {
-      if (toast.parentNode) {
-        toast.remove();
-      }
-    }, 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // 전역 함수로 노출
 window.openProjectModal = openProjectModal;
diff --git a/system1-factory/web/js/safety-checklist-manage.js b/system1-factory/web/js/safety-checklist-manage.js
index d0bdc02..79fb94f 100644
--- a/system1-factory/web/js/safety-checklist-manage.js
+++ b/system1-factory/web/js/safety-checklist-manage.js
@@ -831,42 +831,7 @@ async function addInlineCheck(tabType) {
   }
 }
 
-/**
- * 토스트 메시지 표시
- */
-function showToast(message, type = 'info') {
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast-message');
-  if (existingToast) {
-    existingToast.remove();
-  }
-
-  const toast = document.createElement('div');
-  toast.className = `toast-message toast-${type}`;
-  toast.textContent = message;
-  toast.style.cssText = `
-    position: fixed;
-    bottom: 20px;
-    left: 50%;
-    transform: translateX(-50%);
-    padding: 12px 24px;
-    border-radius: 8px;
-    font-size: 14px;
-    font-weight: 500;
-    z-index: 9999;
-    animation: fadeInUp 0.3s ease;
-    ${type === 'success' ? 'background: #10b981; color: white;' : ''}
-    ${type === 'error' ? 'background: #ef4444; color: white;' : ''}
-    ${type === 'info' ? 'background: #3b82f6; color: white;' : ''}
-  `;
-
-  document.body.appendChild(toast);
-
-  setTimeout(() => {
-    toast.style.animation = 'fadeOut 0.3s ease';
-    setTimeout(() => toast.remove(), 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // 모달 외부 클릭 시 닫기
 document.getElementById('checkModal')?.addEventListener('click', function(e) {
diff --git a/system1-factory/web/js/safety-management.js b/system1-factory/web/js/safety-management.js
index a6fc975..5a30a8e 100644
--- a/system1-factory/web/js/safety-management.js
+++ b/system1-factory/web/js/safety-management.js
@@ -4,85 +4,7 @@ let currentStatus = 'pending';
 let requests = [];
 let currentRejectRequestId = null;
 
-// ==================== Toast 알림 ====================
-
-function showToast(message, type = 'info', duration = 3000) {
-  const toastContainer = document.getElementById('toastContainer') || createToastContainer();
-
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-
-  toast.innerHTML = `
-    <span class="toast-icon">${iconMap[type] || 'ℹ️'}</span>
-    <span class="toast-message">${message}</span>
-  `;
-
-  toastContainer.appendChild(toast);
-
-  setTimeout(() => toast.classList.add('show'), 10);
-
-  setTimeout(() => {
-    toast.classList.remove('show');
-    setTimeout(() => toast.remove(), 300);
-  }, duration);
-}
-
-function createToastContainer() {
-  const container = document.createElement('div');
-  container.id = 'toastContainer';
-  container.style.cssText = `
-    position: fixed;
-    top: 20px;
-    right: 20px;
-    z-index: 9999;
-    display: flex;
-    flex-direction: column;
-    gap: 10px;
-  `;
-
-  document.body.appendChild(container);
-
-  if (!document.getElementById('toastStyles')) {
-    const style = document.createElement('style');
-    style.id = 'toastStyles';
-    style.textContent = `
-      .toast {
-        display: flex;
-        align-items: center;
-        gap: 12px;
-        padding: 12px 20px;
-        background: white;
-        border-radius: 8px;
-        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
-        opacity: 0;
-        transform: translateX(100px);
-        transition: all 0.3s ease;
-        min-width: 250px;
-        max-width: 400px;
-      }
-      .toast.show {
-        opacity: 1;
-        transform: translateX(0);
-      }
-      .toast-success { border-left: 4px solid #10b981; }
-      .toast-error { border-left: 4px solid #ef4444; }
-      .toast-warning { border-left: 4px solid #f59e0b; }
-      .toast-info { border-left: 4px solid #3b82f6; }
-      .toast-icon { font-size: 20px; }
-      .toast-message { font-size: 14px; color: #374151; }
-    `;
-    document.head.appendChild(style);
-  }
-
-  return container;
-}
+// showToast → api-base.js 전역 사용
 
 // ==================== 초기화 ====================
 
@@ -436,7 +358,6 @@ function startTraining(requestId) {
 }
 
 // 전역 함수로 노출
-window.showToast = showToast;
 window.switchTab = switchTab;
 window.viewDetail = viewDetail;
 window.closeDetailModal = closeDetailModal;
diff --git a/system1-factory/web/js/safety-training-conduct.js b/system1-factory/web/js/safety-training-conduct.js
index d6e38a6..746c7a7 100644
--- a/system1-factory/web/js/safety-training-conduct.js
+++ b/system1-factory/web/js/safety-training-conduct.js
@@ -8,85 +8,7 @@ let isDrawing = false;
 let hasSignature = false;
 let savedSignatures = []; // 저장된 서명 목록
 
-// ==================== Toast 알림 ====================
-
-function showToast(message, type = 'info', duration = 3000) {
-  const toastContainer = document.getElementById('toastContainer') || createToastContainer();
-
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-
-  toast.innerHTML = `
-    <span class="toast-icon">${iconMap[type] || 'ℹ️'}</span>
-    <span class="toast-message">${message}</span>
-  `;
-
-  toastContainer.appendChild(toast);
-
-  setTimeout(() => toast.classList.add('show'), 10);
-
-  setTimeout(() => {
-    toast.classList.remove('show');
-    setTimeout(() => toast.remove(), 300);
-  }, duration);
-}
-
-function createToastContainer() {
-  const container = document.createElement('div');
-  container.id = 'toastContainer';
-  container.style.cssText = `
-    position: fixed;
-    top: 20px;
-    right: 20px;
-    z-index: 9999;
-    display: flex;
-    flex-direction: column;
-    gap: 10px;
-  `;
-
-  document.body.appendChild(container);
-
-  if (!document.getElementById('toastStyles')) {
-    const style = document.createElement('style');
-    style.id = 'toastStyles';
-    style.textContent = `
-      .toast {
-        display: flex;
-        align-items: center;
-        gap: 12px;
-        padding: 12px 20px;
-        background: white;
-        border-radius: 8px;
-        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
-        opacity: 0;
-        transform: translateX(100px);
-        transition: all 0.3s ease;
-        min-width: 250px;
-        max-width: 400px;
-      }
-      .toast.show {
-        opacity: 1;
-        transform: translateX(0);
-      }
-      .toast-success { border-left: 4px solid #10b981; }
-      .toast-error { border-left: 4px solid #ef4444; }
-      .toast-warning { border-left: 4px solid #f59e0b; }
-      .toast-info { border-left: 4px solid #3b82f6; }
-      .toast-icon { font-size: 20px; }
-      .toast-message { font-size: 14px; color: #374151; }
-    `;
-    document.head.appendChild(style);
-  }
-
-  return container;
-}
+// showToast → api-base.js 전역 사용
 
 // ==================== 초기화 ====================
 
@@ -544,7 +466,6 @@ function goBack() {
 }
 
 // 전역 함수로 노출
-window.showToast = showToast;
 window.clearSignature = clearSignature;
 window.saveSignature = saveSignature;
 window.deleteSignature = deleteSignature;
diff --git a/system1-factory/web/js/task-management.js b/system1-factory/web/js/task-management.js
index 917ceb9..82866e1 100644
--- a/system1-factory/web/js/task-management.js
+++ b/system1-factory/web/js/task-management.js
@@ -358,31 +358,7 @@ function formatDate(dateString) {
   });
 }
 
-// 토스트 알림
-function showToast(message, type = 'info') {
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-  toast.style.cssText = `
-    position: fixed;
-    top: 20px;
-    right: 20px;
-    padding: 1rem 1.5rem;
-    background: ${type === 'success' ? '#10b981' : type === 'error' ? '#ef4444' : '#3b82f6'};
-    color: white;
-    border-radius: 0.5rem;
-    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
-    z-index: 10000;
-    animation: slideIn 0.3s ease-out;
-  `;
-
-  document.body.appendChild(toast);
-
-  setTimeout(() => {
-    toast.style.animation = 'slideOut 0.3s ease-out';
-    setTimeout(() => toast.remove(), 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // ==================== 공정 관리 ====================
 
diff --git a/system1-factory/web/js/tbm-create.js b/system1-factory/web/js/tbm-create.js
index d0fa09b..e71b185 100644
--- a/system1-factory/web/js/tbm-create.js
+++ b/system1-factory/web/js/tbm-create.js
@@ -32,7 +32,7 @@
   document.addEventListener('DOMContentLoaded', async function() {
     try {
       // apiCall이 준비될 때까지 대기
-      await waitForApiCall();
+      await waitForApi();
 
       // 초기 데이터 로드
       await window.TbmAPI.loadInitialData();
@@ -68,22 +68,7 @@
     }
   });
 
-  function waitForApiCall() {
-    return new Promise(function(resolve) {
-      if (typeof window.apiCall === 'function') {
-        resolve();
-        return;
-      }
-      var checks = 0;
-      var interval = setInterval(function() {
-        checks++;
-        if (typeof window.apiCall === 'function' || checks > 50) {
-          clearInterval(interval);
-          resolve();
-        }
-      }, 100);
-    });
-  }
+  // waitForApi → api-base.js 전역 사용
 
   // ==================== 네비게이션 ====================
 
diff --git a/system1-factory/web/js/tbm.js b/system1-factory/web/js/tbm.js
index 6f0429e..c67a70e 100644
--- a/system1-factory/web/js/tbm.js
+++ b/system1-factory/web/js/tbm.js
@@ -1005,13 +1005,7 @@ window.saveTbmSession = saveTbmSession;
 
 // ==================== 작업자 관리 ====================
 
-// UUID 생성 함수
-function generateUUID() {
-  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
-    const r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
-    return v.toString(16);
-  });
-}
+// generateUUID → api-base.js 전역 사용
 
 // 작업자 카드 리스트 렌더링
 function renderWorkerTaskList() {
@@ -3081,46 +3075,4 @@ async function saveHandover() {
 }
 window.saveHandover = saveHandover;
 
-// 토스트 알림
-function showToast(message, type = 'info', duration = 3000) {
-  const container = document.getElementById('toastContainer');
-  if (!container) return;
-
-  const toast = document.createElement('div');
-  toast.className = `toast ${type}`;
-
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-
-  toast.innerHTML = `
-    <div class="toast-icon">${iconMap[type] || 'ℹ️'}</div>
-    <div class="toast-message">${message}</div>
-    <button class="toast-close" onclick="this.parentElement.remove()">×</button>
-  `;
-
-  toast.style.cssText = `
-    display: flex;
-    align-items: center;
-    gap: 0.75rem;
-    padding: 1rem 1.25rem;
-    background: white;
-    border-radius: 0.5rem;
-    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
-    margin-bottom: 0.75rem;
-    min-width: 300px;
-    animation: slideIn 0.3s ease-out;
-  `;
-
-  container.appendChild(toast);
-
-  setTimeout(() => {
-    if (toast.parentElement) {
-      toast.style.animation = 'slideOut 0.3s ease-out';
-      setTimeout(() => toast.remove(), 300);
-    }
-  }, duration);
-}
+// showToast → api-base.js 전역 사용
diff --git a/system1-factory/web/js/tbm/utils.js b/system1-factory/web/js/tbm/utils.js
index 7926a43..c0ff8c4 100644
--- a/system1-factory/web/js/tbm/utils.js
+++ b/system1-factory/web/js/tbm/utils.js
@@ -173,56 +173,8 @@ class TbmUtils {
 // 전역 인스턴스 생성
 window.TbmUtils = new TbmUtils();
 
-// 하위 호환성: 기존 함수들
+// 하위 호환성: TBM 전용 유틸 (showToast, formatDate, waitForApi, generateUUID는 api-base.js 전역)
 window.getTodayKST = () => window.TbmUtils.getTodayKST();
-window.formatDate = (dateString) => window.TbmUtils.formatDate(dateString);
-
-// 토스트 알림
-window.showToast = function(message, type = 'info', duration = 3000) {
-  const container = document.getElementById('toastContainer');
-  if (!container) {
-    console.log(`[Toast] ${type}: ${message}`);
-    return;
-  }
-
-  const toast = document.createElement('div');
-  toast.className = `toast ${type}`;
-
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-
-  toast.innerHTML = `
-    <div class="toast-icon">${iconMap[type] || 'ℹ️'}</div>
-    <div class="toast-message">${message}</div>
-    <button class="toast-close" onclick="this.parentElement.remove()">×</button>
-  `;
-
-  toast.style.cssText = `
-    display: flex;
-    align-items: center;
-    gap: 0.75rem;
-    padding: 1rem 1.25rem;
-    background: white;
-    border-radius: 0.5rem;
-    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
-    margin-bottom: 0.75rem;
-    min-width: 300px;
-    animation: slideIn 0.3s ease-out;
-  `;
-
-  container.appendChild(toast);
-
-  setTimeout(() => {
-    if (toast.parentElement) {
-      toast.style.animation = 'slideOut 0.3s ease-out';
-      setTimeout(() => toast.remove(), 300);
-    }
-  }, duration);
-};
 
 // 카테고리별 그룹화
 window.groupChecksByCategory = function(checks) {
diff --git a/system1-factory/web/js/vacation-allocation.js b/system1-factory/web/js/vacation-allocation.js
index c835279..2a156e4 100644
--- a/system1-factory/web/js/vacation-allocation.js
+++ b/system1-factory/web/js/vacation-allocation.js
@@ -840,25 +840,4 @@ function closeModals() {
   });
 }
 
-/**
- * 토스트 메시지
- */
-function showToast(message, type = 'info') {
-  const container = document.getElementById('toastContainer');
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-
-  container.appendChild(toast);
-
-  setTimeout(() => {
-    toast.classList.add('show');
-  }, 10);
-
-  setTimeout(() => {
-    toast.classList.remove('show');
-    setTimeout(() => {
-      container.removeChild(toast);
-    }, 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
diff --git a/system1-factory/web/js/visit-request.js b/system1-factory/web/js/visit-request.js
index 7a26e18..752625d 100644
--- a/system1-factory/web/js/visit-request.js
+++ b/system1-factory/web/js/visit-request.js
@@ -10,94 +10,7 @@ let canvas = null;
 let ctx = null;
 let layoutImage = null;
 
-// ==================== Toast 알림 ====================
-
-/**
- * Toast 메시지 표시
- */
-function showToast(message, type = 'info', duration = 3000) {
-  const toastContainer = document.getElementById('toastContainer') || createToastContainer();
-
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-
-  const iconMap = {
-    success: '✅',
-    error: '❌',
-    warning: '⚠️',
-    info: 'ℹ️'
-  };
-
-  toast.innerHTML = `
-    <span class="toast-icon">${iconMap[type] || 'ℹ️'}</span>
-    <span class="toast-message">${message}</span>
-  `;
-
-  toastContainer.appendChild(toast);
-
-  // 애니메이션
-  setTimeout(() => toast.classList.add('show'), 10);
-
-  // 자동 제거
-  setTimeout(() => {
-    toast.classList.remove('show');
-    setTimeout(() => toast.remove(), 300);
-  }, duration);
-}
-
-/**
- * Toast 컨테이너 생성
- */
-function createToastContainer() {
-  const container = document.createElement('div');
-  container.id = 'toastContainer';
-  container.style.cssText = `
-    position: fixed;
-    top: 20px;
-    right: 20px;
-    z-index: 9999;
-    display: flex;
-    flex-direction: column;
-    gap: 10px;
-  `;
-
-  document.body.appendChild(container);
-
-  // Toast 스타일 추가
-  if (!document.getElementById('toastStyles')) {
-    const style = document.createElement('style');
-    style.id = 'toastStyles';
-    style.textContent = `
-      .toast {
-        display: flex;
-        align-items: center;
-        gap: 12px;
-        padding: 12px 20px;
-        background: white;
-        border-radius: 8px;
-        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
-        opacity: 0;
-        transform: translateX(100px);
-        transition: all 0.3s ease;
-        min-width: 250px;
-        max-width: 400px;
-      }
-      .toast.show {
-        opacity: 1;
-        transform: translateX(0);
-      }
-      .toast-success { border-left: 4px solid #10b981; }
-      .toast-error { border-left: 4px solid #ef4444; }
-      .toast-warning { border-left: 4px solid #f59e0b; }
-      .toast-info { border-left: 4px solid #3b82f6; }
-      .toast-icon { font-size: 20px; }
-      .toast-message { font-size: 14px; color: #374151; }
-    `;
-    document.head.appendChild(style);
-  }
-
-  return container;
-}
+// showToast, createToastContainer → api-base.js 전역 사용
 
 // ==================== 초기화 ====================
 
@@ -523,7 +436,6 @@ function resetForm() {
 }
 
 // 전역 함수로 노출
-window.showToast = showToast;
 window.openMapModal = openMapModal;
 window.closeMapModal = closeMapModal;
 window.loadWorkplaceMap = loadWorkplaceMap;
diff --git a/system1-factory/web/js/work-analysis.js b/system1-factory/web/js/work-analysis.js
index 4c53e8b..f5951a1 100644
--- a/system1-factory/web/js/work-analysis.js
+++ b/system1-factory/web/js/work-analysis.js
@@ -740,59 +740,7 @@ function formatDate(date) {
   return `${year}-${month}-${day}`;
 }
 
-// 토스트 메시지 표시
-function showToast(message, type = 'info') {
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast');
-  if (existingToast) {
-    existingToast.remove();
-  }
-  
-  // 새 토스트 생성
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-  
-  // 스타일 적용
-  Object.assign(toast.style, {
-    position: 'fixed',
-    top: '20px',
-    right: '20px',
-    padding: '12px 24px',
-    borderRadius: '8px',
-    color: 'white',
-    fontWeight: '500',
-    zIndex: '10000',
-    transform: 'translateX(100%)',
-    transition: 'transform 0.3s ease'
-  });
-  
-  // 타입별 배경색
-  const colors = {
-    success: '#10b981',
-    error: '#ef4444',
-    warning: '#f59e0b',
-    info: '#3b82f6'
-  };
-  toast.style.backgroundColor = colors[type] || colors.info;
-  
-  document.body.appendChild(toast);
-  
-  // 애니메이션
-  setTimeout(() => {
-    toast.style.transform = 'translateX(0)';
-  }, 100);
-  
-  // 자동 제거
-  setTimeout(() => {
-    toast.style.transform = 'translateX(100%)';
-    setTimeout(() => {
-      if (toast.parentNode) {
-        toast.remove();
-      }
-    }, 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // 전역 함수로 노출
 window.switchAnalysisMode = switchAnalysisMode;
diff --git a/system1-factory/web/js/work-management.js b/system1-factory/web/js/work-management.js
index 99fd157..1bc6adf 100644
--- a/system1-factory/web/js/work-management.js
+++ b/system1-factory/web/js/work-management.js
@@ -172,59 +172,7 @@ function navigateToPage(url) {
   }, 300);
 }
 
-// 토스트 메시지 표시
-function showToast(message, type = 'info') {
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast');
-  if (existingToast) {
-    existingToast.remove();
-  }
-  
-  // 새 토스트 생성
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-  
-  // 스타일 적용
-  Object.assign(toast.style, {
-    position: 'fixed',
-    top: '20px',
-    right: '20px',
-    padding: '12px 24px',
-    borderRadius: '8px',
-    color: 'white',
-    fontWeight: '500',
-    zIndex: '1000',
-    transform: 'translateX(100%)',
-    transition: 'transform 0.3s ease'
-  });
-  
-  // 타입별 배경색
-  const colors = {
-    success: '#10b981',
-    error: '#ef4444',
-    warning: '#f59e0b',
-    info: '#3b82f6'
-  };
-  toast.style.backgroundColor = colors[type] || colors.info;
-  
-  document.body.appendChild(toast);
-  
-  // 애니메이션
-  setTimeout(() => {
-    toast.style.transform = 'translateX(0)';
-  }, 100);
-  
-  // 자동 제거
-  setTimeout(() => {
-    toast.style.transform = 'translateX(100%)';
-    setTimeout(() => {
-      if (toast.parentNode) {
-        toast.remove();
-      }
-    }, 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // 전역 함수로 노출
 window.navigateToPage = navigateToPage;
diff --git a/system1-factory/web/js/worker-management.js b/system1-factory/web/js/worker-management.js
index 8908fdb..94c03a3 100644
--- a/system1-factory/web/js/worker-management.js
+++ b/system1-factory/web/js/worker-management.js
@@ -10,21 +10,11 @@ let currentEditingWorker = null;
 // 페이지 초기화
 document.addEventListener('DOMContentLoaded', async () => {
   console.log('👥 작업자 관리 페이지 초기화 시작');
-  await waitForApiConfig();
+  await waitForApi();
   await loadDepartments();
 });
 
-// API 설정 로드 대기
-async function waitForApiConfig() {
-  let retryCount = 0;
-  while (!window.apiCall && retryCount < 50) {
-    await new Promise(resolve => setTimeout(resolve, 100));
-    retryCount++;
-  }
-  if (!window.apiCall) {
-    console.error('API 설정 로드 실패');
-  }
-}
+// waitForApi → api-base.js 전역 사용
 
 // ============================================
 // 부서 관련 함수
@@ -573,53 +563,7 @@ function formatDate(dateString) {
   });
 }
 
-// 토스트 메시지 표시
-function showToast(message, type = 'info') {
-  const existingToast = document.querySelector('.toast');
-  if (existingToast) {
-    existingToast.remove();
-  }
-
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-
-  Object.assign(toast.style, {
-    position: 'fixed',
-    top: '20px',
-    right: '20px',
-    padding: '12px 24px',
-    borderRadius: '8px',
-    color: 'white',
-    fontWeight: '500',
-    zIndex: '10000',
-    transform: 'translateX(100%)',
-    transition: 'transform 0.3s ease'
-  });
-
-  const colors = {
-    success: '#10b981',
-    error: '#ef4444',
-    warning: '#f59e0b',
-    info: '#3b82f6'
-  };
-  toast.style.backgroundColor = colors[type] || colors.info;
-
-  document.body.appendChild(toast);
-
-  setTimeout(() => {
-    toast.style.transform = 'translateX(0)';
-  }, 100);
-
-  setTimeout(() => {
-    toast.style.transform = 'translateX(100%)';
-    setTimeout(() => {
-      if (toast.parentNode) {
-        toast.remove();
-      }
-    }, 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // ============================================
 // 전역 함수 노출
diff --git a/system1-factory/web/js/workplace-management.js b/system1-factory/web/js/workplace-management.js
index 223c8a7..b1cb198 100644
--- a/system1-factory/web/js/workplace-management.js
+++ b/system1-factory/web/js/workplace-management.js
@@ -903,59 +903,7 @@ function formatDate(dateString) {
   });
 }
 
-// 토스트 메시지 표시
-function showToast(message, type = 'info') {
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast');
-  if (existingToast) {
-    existingToast.remove();
-  }
-
-  // 새 토스트 생성
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-
-  // 스타일 적용
-  Object.assign(toast.style, {
-    position: 'fixed',
-    top: '20px',
-    right: '20px',
-    padding: '12px 24px',
-    borderRadius: '8px',
-    color: 'white',
-    fontWeight: '500',
-    zIndex: '1000',
-    transform: 'translateX(100%)',
-    transition: 'transform 0.3s ease'
-  });
-
-  // 타입별 배경색
-  const colors = {
-    success: '#10b981',
-    error: '#ef4444',
-    warning: '#f59e0b',
-    info: '#3b82f6'
-  };
-  toast.style.backgroundColor = colors[type] || colors.info;
-
-  document.body.appendChild(toast);
-
-  // 애니메이션
-  setTimeout(() => {
-    toast.style.transform = 'translateX(0)';
-  }, 100);
-
-  // 자동 제거
-  setTimeout(() => {
-    toast.style.transform = 'translateX(100%)';
-    setTimeout(() => {
-      if (toast.parentNode) {
-        toast.remove();
-      }
-    }, 300);
-  }, 3000);
-}
+// showToast → api-base.js 전역 사용
 
 // 전역 함수 및 변수로 노출 (다른 모듈에서 접근 가능하도록)
 // 모듈 시스템이 이미 정의했으면 건너뜀
@@ -1604,7 +1552,6 @@ window.saveWorkplace = saveWorkplace;
 window.deleteWorkplace = deleteWorkplace;
 window.confirmDeleteWorkplace = confirmDeleteWorkplace;
 window.refreshWorkplaces = refreshWorkplaces;
-window.showToast = showToast;
 window.loadCategories = loadCategories;
 window.updateLayoutPreview = updateLayoutPreview;
 window.openWorkplaceMapModal = openWorkplaceMapModal;
diff --git a/system1-factory/web/js/workplace-management/utils.js b/system1-factory/web/js/workplace-management/utils.js
index 49fa1be..1dd9c11 100644
--- a/system1-factory/web/js/workplace-management/utils.js
+++ b/system1-factory/web/js/workplace-management/utils.js
@@ -94,61 +94,6 @@ class WorkplaceUtils {
 // 전역 인스턴스 생성
 window.WorkplaceUtils = new WorkplaceUtils();
 
-// 하위 호환성: 기존 함수들
-window.formatDate = (dateString) => window.WorkplaceUtils.formatDate(dateString);
-
-// 토스트 메시지 표시
-window.showToast = function(message, type = 'info') {
-  // 기존 토스트 제거
-  const existingToast = document.querySelector('.toast');
-  if (existingToast) {
-    existingToast.remove();
-  }
-
-  // 새 토스트 생성
-  const toast = document.createElement('div');
-  toast.className = `toast toast-${type}`;
-  toast.textContent = message;
-
-  // 스타일 적용
-  Object.assign(toast.style, {
-    position: 'fixed',
-    top: '20px',
-    right: '20px',
-    padding: '12px 24px',
-    borderRadius: '8px',
-    color: 'white',
-    fontWeight: '500',
-    zIndex: '1000',
-    transform: 'translateX(100%)',
-    transition: 'transform 0.3s ease'
-  });
-
-  // 타입별 배경색
-  const colors = {
-    success: '#10b981',
-    error: '#ef4444',
-    warning: '#f59e0b',
-    info: '#3b82f6'
-  };
-  toast.style.backgroundColor = colors[type] || colors.info;
-
-  document.body.appendChild(toast);
-
-  // 애니메이션
-  setTimeout(() => {
-    toast.style.transform = 'translateX(0)';
-  }, 100);
-
-  // 자동 제거
-  setTimeout(() => {
-    toast.style.transform = 'translateX(100%)';
-    setTimeout(() => {
-      if (toast.parentNode) {
-        toast.remove();
-      }
-    }, 300);
-  }, 3000);
-};
+// showToast, formatDate → api-base.js 전역 사용
 
 console.log('[Module] workplace-management/utils.js 로드 완료');