Standardize blog editor and content styles

src/TaxBaik.Web/wwwroot/css/admin.css

@@ -1461,17 +1461,34 @@ textarea:focus-visible {
   padding: 3rem 1.5rem;
 }
 
-.admin-editor-root .admin-editor-toolbar {
+.blog-editor-shell .editor-block {
+  margin-bottom: 1.25rem;
+}
+
+.blog-editor-shell .editor-toolbar {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem;
   margin-bottom: 0.75rem;
 }
 
-.admin-editor-content {
+.blog-editor-shell .editor-surface,
+.blog-editor-shell .blog-preview-pane {
   min-height: 320px;
   overflow: auto;
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-lg);
+  background: var(--bg-primary);
+  padding: 1rem 1.1rem;
 }
 
-.admin-editor-preview {
-  min-height: 320px;
+.blog-editor-shell .editor-surface:focus {
+  outline: 2px solid rgba(31, 78, 121, 0.18);
+  border-color: var(--primary-color);
+}
+
+.blog-editor-shell .blog-meta-grid {
+  margin-top: 0.25rem;
 }
 
 /* ============================================================================

src/TaxBaik.Web/wwwroot/css/site.css

@@ -58,6 +58,70 @@ body {
     letter-spacing: 0.3px;
 }
 
+/* ===== 공통 콘텐츠 렌더링 ===== */
+.content-shell {
+    max-width: 1120px;
+    margin-inline: auto;
+    padding-inline: var(--spacing-lg);
+}
+
+.content-article {
+    max-width: 840px;
+}
+
+.content-card {
+    background: #fff;
+    border: 1px solid rgba(217, 211, 196, 0.7);
+    border-radius: var(--radius-xl);
+    box-shadow: var(--shadow-sm);
+}
+
+.content-prose {
+    color: var(--color-text);
+    line-height: 1.9;
+    word-break: keep-all;
+}
+
+.content-prose > :first-child {
+    margin-top: 0;
+}
+
+.content-prose > :last-child {
+    margin-bottom: 0;
+}
+
+.content-prose h2,
+.content-prose h3,
+.content-prose h4 {
+    margin-top: 1.75rem;
+    margin-bottom: 1rem;
+}
+
+.content-prose p,
+.content-prose ul,
+.content-prose ol,
+.content-prose blockquote {
+    margin-bottom: 1rem;
+}
+
+.content-prose img {
+    max-width: 100%;
+    height: auto;
+    border-radius: var(--radius-lg);
+}
+
+.content-prose blockquote {
+    padding: 1rem 1.25rem;
+    border-left: 4px solid var(--color-primary);
+    background: rgba(200, 157, 110, 0.08);
+    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
+    color: var(--color-text-light);
+}
+
+.content-prose table {
+    width: 100%;
+}
+
 /* ===== 타이포그래피 ===== */
 h1, h2, h3, h4, h5, h6 {
     font-weight: 700;