diff --git a/js/dashboard.js b/js/dashboard.js
index 7d43ba6..b5ff1b8 100644
--- a/js/dashboard.js
+++ b/js/dashboard.js
@@ -120,14 +120,21 @@ function createProjectHtml(p) {
     const isNoFiles = (files === 0 || files === null);
     const statusClass = isNoFiles ? "status-error" : "";
     
-    // 로그 텍스트 스타일 결정 (기록 없음 이거나 폴더자동삭제인 경우)
-    const logStyleClass = (recentLog === '기록 없음' || isStaleLog) ? 'warning-text' : '';
+    // 로그 텍스트 스타일 결정
+    // 폴더자동삭제는 위험(error), 기록 없음은 주의(warning)
+    let logStyleClass = "";
+    if (isStaleLog) {
+        logStyleClass = "error-text";
+    } else if (recentLog === "기록 없음") {
+        logStyleClass = "warning-text";
+    }
+    
     const logBoldStyle = isStaleLog ? 'font-weight: 800;' : '';
 
     return `
         <div class="accordion-item ${statusClass}">
             <div class="accordion-header" onclick="toggleAccordion(this)">
-                <div class="repo-title" title="${name}">${name}</div><div class="repo-dept">${dept}</div><div class="repo-admin">${admin}</div><div class="repo-files ${isNoFiles ? 'warning-text' : ''}">${files || 0}</div><div class="repo-log ${logStyleClass}" style="${logBoldStyle}" title="${recentLog}">${recentLog}</div>
+                <div class="repo-title" title="${name}">${name}</div><div class="repo-dept">${dept}</div><div class="repo-admin">${admin}</div><div class="repo-files ${isNoFiles ? 'error-text' : ''}">${files || 0}</div><div class="repo-log ${logStyleClass}" style="${logBoldStyle}" title="${recentLog}">${recentLog}</div>
             </div>
             <div class="accordion-body">
                 <div class="detail-grid">
@@ -170,14 +177,25 @@ function showActivityDetails(status) {
     modal.style.display = 'flex';
 }
 
-function closeActivityModal() { document.getElementById('activityDetailModal').style.display = 'none'; }
+function closeActivityModal() { 
+    const modal = document.getElementById('activityDetailModal');
+    if (modal) modal.style.display = 'none'; 
+}
+
+function closeAuthModal() { 
+    const modal = document.getElementById('authModal');
+    if (modal) modal.style.display = 'none'; 
+}
 
 function scrollToProject(name) {
     closeActivityModal();
     const target = Array.from(document.querySelectorAll('.repo-title')).find(t => t.innerText.trim() === name.trim())?.closest('.accordion-header');
     if (target) {
         let p = target.parentElement;
-        while (p && p !== document.body) { if (p.classList.contains('continent-group') || p.classList.contains('country-group')) p.classList.add('active'); p = p.parentElement; }
+        while (p && p !== document.body) { 
+            if (p.classList.contains('continent-group') || p.classList.contains('country-group')) p.classList.add('active'); 
+            p = p.parentElement; 
+        }
         target.parentElement.classList.add('active');
         const pos = target.getBoundingClientRect().top + window.pageYOffset - 220;
         window.scrollTo({ top: pos, behavior: 'smooth' });
diff --git a/style/common.css b/style/common.css
index 090f80c..3ccba6a 100644
--- a/style/common.css
+++ b/style/common.css
@@ -1,80 +1,70 @@
 :root {
-    /* Design Tokens */
+    /* 1. Core Colors */
     --primary-color: #1E5149;
-    --primary-lv-0: #e9eeed;
-    --primary-lv-1: #D2DCDB;
+    --primary-hover: #163b36;
+    --primary-lv-0: #f0f7f4;
+    --primary-lv-1: #e1eee9;
     --primary-lv-8: #193833;
+    
     --bg-default: #FFFFFF;
     --bg-muted: #F9FAFB;
-    --text-main: #2D3748;
-    --text-sub: #718096;
-    --border-color: #E2E8F0;
     --hover-bg: #F7FAFC;
+    
+    --text-main: #111827;
+    --text-sub: #6B7280;
+    --error-color: #F21D0D;
+    --border-color: #E2E8F0;
+
+    /* 2. Gradients */
     --header-gradient: linear-gradient(90deg, #193833 0%, #1e5149 100%);
     --ai-gradient: linear-gradient(180deg, #da8cf1 0%, #8bb1f2 100%);
+
+    /* 3. Spacing & Radius */
     --space-xs: 4px;
     --space-sm: 8px;
     --space-md: 16px;
     --space-lg: 32px;
-    --space-xl: 64px;
     --radius-sm: 4px;
+    --radius-md: 6px;
     --radius-lg: 8px;
+    --radius-xl: 12px;
+
+    /* 4. Typography */
     --fz-h1: 20px;
     --fz-h2: 16px;
     --fz-body: 13px;
-    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
+    --fz-small: 11px;
+
+    /* 5. Shadows */
+    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
     --box-shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
+    --box-shadow-modal: 0 25px 50px -12px rgba(0,0,0,0.5);
+
+    /* 6. Layout Constants */
+    --topbar-h: 36px;
 }
 
 /* Base Reset */
-* {
-    margin: 0;
-    padding: 0;
-    box-sizing: border-box;
-}
-
+* { margin: 0; padding: 0; box-sizing: border-box; }
 body {
-    font-family: 'Pretendard', sans-serif;
+    font-family: 'Pretendard', -apple-system, sans-serif;
     font-size: var(--fz-body);
     color: var(--text-main);
     background: var(--bg-default);
     min-height: 100vh;
 }
 
-/* 메일 관리자 전용: 전체 스크롤 방지 */
-body:has(.mail-wrapper) {
-    height: 100vh;
-    overflow: hidden;
-}
+/* Page Specific Overrides */
+body:has(.mail-wrapper) { height: 100vh; overflow: hidden; }
 
-input, select, textarea, button {
-    font-family: 'Pretendard', sans-serif;
-}
+input, select, textarea, button { font-family: inherit; }
+a { text-decoration: none; color: inherit; }
+button { cursor: pointer; border: none; transition: all 0.2s ease; }
 
-a {
-    text-decoration: none;
-    color: inherit;
-}
-
-button {
-    cursor: pointer;
-    border: none;
-    font-family: inherit;
-    transition: all 0.2s ease;
-}
-
-/* Layout Utilities */
-.flex-center {
-    display: flex;
-    align-items: center;
-    justify-content: center;
-}
-
-.flex-between {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-}
+/* Utilities */
+.flex-center { display: flex; align-items: center; justify-content: center; }
+.flex-between { display: flex; align-items: center; justify-content: space-between; }
+.text-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 
 /* Components: Topbar */
 .topbar {
@@ -84,198 +74,97 @@ button {
     padding: 0 var(--space-lg);
     position: fixed;
     top: 0;
-    height: 36px;
+    height: var(--topbar-h);
     display: flex;
     align-items: center;
-    z-index: 1000;
-}
-
-.topbar-header {
-    margin-right: 60px;
-    font-weight: 700;
-}
-
-.topbar-header h2 {
-    font-size: 16px;
-    color: white;
-}
-
-.nav-list {
-    display: flex;
-    list-style: none;
-    gap: var(--space-sm);
-}
-
-.nav-item {
-    padding: 4px 8px;
-    border-radius: 4px;
-    color: rgba(255, 255, 255, 0.8);
-    transition: 0.2s;
-    font-size: 14px;
-    cursor: pointer;
-}
-
-.nav-item:hover {
-    background: var(--primary-lv-1);
-    color: #fff;
-}
-
-.nav-item.active {
-    background: var(--primary-lv-0);
-    color: var(--primary-color) !important;
-    font-weight: 700;
-}
-
-/* Modals */
-.modal-overlay {
-    display: none;
-    position: fixed;
-    top: 0;
-    left: 0;
-    width: 100%;
-    height: 100%;
-    background: rgba(0, 0, 0, 0.6);
     z-index: 2000;
-    justify-content: center;
-    align-items: center;
 }
+.topbar-header h2 { font-size: 16px; color: white; margin-right: 60px; font-weight: 700; }
+.nav-list { display: flex; list-style: none; gap: var(--space-sm); }
+.nav-item {
+    padding: 4px 12px; border-radius: var(--radius-sm);
+    color: rgba(255, 255, 255, 0.8); font-size: 14px;
+}
+.nav-item:hover { background: var(--primary-lv-8); color: #fff; }
+.nav-item.active { background: var(--primary-lv-0); color: var(--primary-color) !important; font-weight: 700; }
 
+/* Components: Modals */
+.modal-overlay {
+    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
+    background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(4px);
+    z-index: 3000; justify-content: center; align-items: center;
+}
 .modal-content {
-    background: white;
-    padding: 24px;
-    border-radius: 12px;
-    width: 90%;
-    max-width: 500px;
-    box-shadow: var(--box-shadow-lg);
+    background: white; padding: 24px; border-radius: var(--radius-xl);
+    width: 90%; max-width: 500px; box-shadow: var(--box-shadow-modal);
 }
-
 .modal-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    margin-bottom: 20px;
-    border-bottom: 1px solid var(--border-color);
-    padding-bottom: 12px;
+    display: flex; justify-content: space-between; align-items: center;
+    margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 12px;
 }
+.modal-header h3 { margin: 0; font-size: 16px; color: var(--primary-color); font-weight: 700; }
+.modal-close { cursor: pointer; font-size: 24px; color: var(--text-sub); line-height: 1; }
+.modal-close:hover { color: var(--text-main); }
 
-.modal-header h3 {
-    margin: 0;
-    font-size: 16px;
-}
+/* Components: Data Tables */
+.data-table { width: 100%; border-collapse: collapse; font-size: 12px; }
+.data-table th, .data-table td { padding: 10px 8px; border-bottom: 1px solid var(--border-color); text-align: left; }
+.data-table th { color: var(--text-sub); font-weight: 600; background: var(--bg-muted); }
+.data-table tr:hover { background: var(--hover-bg); }
 
-.modal-close {
-    cursor: pointer;
-    font-size: 20px;
+/* Components: Buttons (Unified) */
+.btn {
+    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
+    padding: 8px 16px; border-radius: var(--radius-lg); font-weight: 600; font-size: 13px;
 }
+.btn-primary { background: var(--primary-color); color: #fff; }
+.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
+.btn-secondary { background: #f1f3f5; color: #495057; }
+.btn-secondary:hover { background: #e9ecef; }
+.btn-danger { background: #fee2e2; color: #dc2626; }
+.btn-danger:hover { background: #fecaca; }
 
-/* Modal Form Elements */
-.select-group {
-    margin-bottom: 16px;
-    text-align: left;
-}
+/* Existing Utils - Compatibility */
+._button-small { @extend .btn; padding: 6px 14px; font-size: 12px; background: var(--primary-color); color: #fff; border-radius: 6px; }
+._button-medium { @extend .btn; padding: 10px 20px; background: var(--primary-color); color: #fff; border-radius: 6px; font-weight: 700; }
+.sync-btn { background: var(--primary-color); color: #fff; padding: 8px 16px; border-radius: 8px; font-size: 13px; font-weight: 600; }
 
-.select-group label {
-    display: block;
-    font-size: 12px;
-    font-weight: 700;
-    color: var(--text-sub);
-    margin-bottom: 6px;
-}
+/* Badges */
+.badge { padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 700; display: inline-block; background: #eee; }
 
-.modal-select {
-    width: 100%;
-    padding: 10px;
-    border: 1px solid var(--border-color);
-    border-radius: 6px;
-    font-size: 14px;
-    background: #fff;
-    outline: none;
-}
+/* Status Colors (Common) */
+.bg-success { background: #e8f5e9; color: #2e7d32; }
+.bg-warning { background: #fff8e1; color: #FFBF00; }
+.bg-danger { background: #ffebee; color: #dc2626; }
+.bg-info { background: #e3f2fd; color: #1565c0; }
 
-.modal-select:focus {
-    border-color: var(--primary-color);
-}
+.status-error { background: #fee9e7; }
+.status-warning { background: #fff9e6; }
 
-/* Data Tables inside Modals */
-.data-table {
-    width: 100%;
-    border-collapse: collapse;
-    font-size: 12px;
-}
-
-.data-table th,
-.data-table td {
-    padding: 10px 8px;
-    border-bottom: 1px solid var(--border-color);
-    text-align: left;
-}
-
-.data-table th {
-    color: var(--text-sub);
-    font-weight: 600;
-    background: var(--bg-muted);
-}
-
-.data-table tr:hover {
-    background: var(--hover-bg);
-}
-
-/* Utils: Buttons */
-._button-xsmall {
-    padding: 2px 8px;
-    font-size: 11px;
-    border-radius: 4px;
-    background: var(--bg-muted);
-    border: 1px solid var(--border-color);
-}
-
-._button-small {
-    padding: 6px 14px;
-    font-size: 12px;
-    border-radius: 6px;
-    background: var(--primary-color);
-    color: #fff;
-    font-weight: 600;
-}
-
-._button-medium {
-    padding: 10px 20px;
-    background: var(--primary-color);
-    color: #fff;
-    border-radius: 6px;
-    font-weight: 700;
-}
-
-.btn-confirm {
-    width: 100%;
-    padding: 12px;
-    background: var(--primary-color);
-    color: white;
-    border: none;
-    border-radius: 8px;
-    font-weight: 700;
-    cursor: pointer;
-    margin-top: 10px;
-}
+.warning-text { color: #FFBF00; font-weight: 600; }
+.error-text { color: #F21D0D !important; font-weight: 700; }
 
 /* Spinner */
 .spinner {
-    display: none;
-    width: 16px;
-    height: 16px;
-    border: 2px solid rgba(255, 255, 255, .3);
-    border-radius: 50%;
-    border-top-color: #fff;
-    animation: spin 1s ease-in-out infinite;
+    display: none; width: 16px; height: 16px; border: 2px solid rgba(255, 255, 255, .3);
+    border-radius: 50%; border-top-color: #fff; animation: spin 1s ease-in-out infinite;
 }
+@keyframes spin { to { transform: rotate(360deg); } }
 
-@keyframes spin {
-    to { transform: rotate(360deg); }
+/* Modals (Refined) */
+.modal-overlay {
+    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
+    background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(4px);
+    z-index: 3000; justify-content: center; align-items: center;
 }
-
-.badge {
-    background: #eee;
-    padding: 2px 6px;
-    border-radius: 4px;
-    font-size: 11px;
+.modal-content {
+    background: white; padding: 24px; border-radius: var(--radius-xl);
+    width: 90%; max-width: 500px; box-shadow: var(--box-shadow-modal);
 }
+.modal-header {
+    display: flex; justify-content: space-between; align-items: center;
+    margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 12px;
+}
+.modal-header h3 { margin: 0; font-size: 16px; color: var(--primary-color); font-weight: 700; }
+.modal-close { cursor: pointer; font-size: 24px; color: var(--text-sub); line-height: 1; transition: 0.2s; }
+.modal-close:hover { color: var(--text-main); }