diff --git a/src/app/globals.css b/src/app/globals.css
index a2dc41e..9ceb4f9 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -1,26 +1,412 @@
-@import "tailwindcss";
+@import "tailwindcss/preflight";
+@import "tailwindcss/utilities";
 
+/* CSS Custom Properties (CSS Variables) */
 :root {
-  --background: #ffffff;
-  --foreground: #171717;
-}
-
-@theme inline {
-  --color-background: var(--background);
-  --color-foreground: var(--foreground);
-  --font-sans: var(--font-geist-sans);
-  --font-mono: var(--font-geist-mono);
+  --foreground-rgb: 0, 0, 0;
+  --background-start-rgb: 214, 219, 220;
+  --background-end-rgb: 255, 255, 255;
+  
+  /* Custom color variables for consistency */
+  --color-primary: #3b82f6;
+  --color-primary-hover: #2563eb;
+  --color-danger: #ef4444;
+  --color-danger-hover: #dc2626;
+  --color-warning: #f59e0b;
+  --color-warning-hover: #d97706;
+  --color-success: #10b981;
+  --color-success-hover: #059669;
+  
+  /* Border and spacing variables */
+  --border-color: #d1d5db;
+  --border-radius: 0.375rem;
+  --spacing-xs: 0.25rem;
+  --spacing-sm: 0.5rem;
+  --spacing-md: 1rem;
 }
 
 @media (prefers-color-scheme: dark) {
   :root {
-    --background: #0a0a0a;
-    --foreground: #ededed;
+    --foreground-rgb: 255, 255, 255;
+    --background-start-rgb: 0, 0, 0;
+    --background-end-rgb: 0, 0, 0;
+    --border-color: #374151;
   }
 }
 
+/* Base body styles */
 body {
-  background: var(--background);
-  color: var(--foreground);
-  font-family: Arial, Helvetica, sans-serif;
+  color: rgb(var(--foreground-rgb));
+  background: linear-gradient(
+      to bottom,
+      transparent,
+      rgb(var(--background-end-rgb))
+    )
+    rgb(var(--background-start-rgb));
 }
+
+/* =================================
+   TABLE STYLES
+   ================================= */
+
+table {
+  border-collapse: collapse;
+  width: 100%;
+  margin-bottom: var(--spacing-md);
+  background-color: white;
+  border-radius: var(--border-radius);
+  overflow: hidden;
+  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
+}
+
+table th,
+table td {
+  border: 1px solid var(--border-color);
+  padding: var(--spacing-sm);
+  text-align: left;
+  vertical-align: top;
+  position: relative;
+  min-width: 120px;
+}
+
+table th {
+  background-color: #f9fafb;
+  font-weight: 600;
+  position: sticky;
+  top: 0;
+  z-index: 10;
+  border-bottom: 2px solid var(--border-color);
+}
+
+/* Dark mode table styles */
+@media (prefers-color-scheme: dark) {
+  table {
+    background-color: #1f2937;
+  }
+  
+  table th {
+    background-color: #374151;
+    color: #f9fafb;
+  }
+  
+  table td {
+    background-color: #1f2937;
+    color: #f9fafb;
+  }
+}
+
+/* =================================
+   DELETE BUTTON STYLES
+   ================================= */
+
+.delete-button {
+  position: absolute;
+  top: 2px;
+  right: 2px;
+  width: 20px;
+  height: 20px;
+  background-color: var(--color-danger);
+  color: white;
+  border: none;
+  border-radius: 50%;
+  font-size: 12px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 5;
+  transition: background-color 0.2s ease-in-out;
+}
+
+.delete-button:hover {
+  background-color: var(--color-danger-hover);
+  transform: scale(1.1);
+}
+
+.delete-button:focus {
+  outline: 2px solid var(--color-danger);
+  outline-offset: 2px;
+}
+
+.item-delete {
+  background-color: var(--color-danger);
+}
+
+.property-delete {
+  background-color: var(--color-warning);
+}
+
+.property-delete:hover {
+  background-color: var(--color-warning-hover);
+}
+
+/* =================================
+   EDITABLE CELL STYLES
+   ================================= */
+
+.editable-cell {
+  position: relative;
+  width: 100%;
+  min-height: 2rem;
+}
+
+.editable-cell input,
+.editable-cell textarea {
+  width: 100%;
+  border: none;
+  outline: none;
+  background: transparent;
+  resize: none;
+  padding: var(--spacing-xs);
+  font-family: inherit;
+  font-size: inherit;
+  transition: all 0.2s ease-in-out;
+}
+
+.editable-cell input:focus,
+.editable-cell textarea:focus {
+  background-color: #fef3c7;
+  border: 2px solid var(--color-warning);
+  border-radius: var(--border-radius);
+}
+
+.focused-cell {
+  background-color: #fef3c7 !important;
+  border: 2px solid var(--color-warning) !important;
+  border-radius: var(--border-radius);
+}
+
+/* =================================
+   TYPEAHEAD STYLES
+   ================================= */
+
+.typeahead-container {
+  position: relative;
+  width: 100%;
+}
+
+.suggestions-dropdown {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  background: white;
+  border: 1px solid var(--border-color);
+  border-top: none;
+  border-radius: 0 0 var(--border-radius) var(--border-radius);
+  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
+  z-index: 50;
+  max-height: 200px;
+  overflow-y: auto;
+}
+
+.suggestion-item {
+  padding: var(--spacing-sm);
+  cursor: pointer;
+  border-bottom: 1px solid #f3f4f6;
+  transition: background-color 0.15s ease-in-out;
+}
+
+.suggestion-item:hover,
+.suggestion-item.selected {
+  background-color: #dbeafe;
+}
+
+.suggestion-item:last-child {
+  border-bottom: none;
+}
+
+/* Dark mode typeahead styles */
+@media (prefers-color-scheme: dark) {
+  .suggestions-dropdown {
+    background: #374151;
+    border-color: #4b5563;
+  }
+  
+  .suggestion-item {
+    color: #f9fafb;
+    border-bottom-color: #4b5563;
+  }
+  
+  .suggestion-item:hover,
+  .suggestion-item.selected {
+    background-color: #4b5563;
+  }
+}
+
+/* =================================
+   FORM INPUT STYLES
+   ================================= */
+
+#new-property {
+  padding: var(--spacing-sm);
+  border: 1px solid var(--border-color);
+  border-radius: var(--border-radius);
+  width: 300px;
+  margin-right: var(--spacing-sm);
+  transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
+}
+
+#new-property:focus {
+  outline: none;
+  border-color: var(--color-primary);
+  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
+}
+
+/* =================================
+   LOADING SPINNER
+   ================================= */
+
+.loading-spinner {
+  display: inline-block;
+  width: 16px;
+  height: 16px;
+  border: 2px solid #f3f4f6;
+  border-radius: 50%;
+  border-top-color: var(--color-primary);
+  animation: spin 1s ease-in-out infinite;
+}
+
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+/* =================================
+   RESPONSIVE DESIGN
+   ================================= */
+
+.table-container {
+  overflow-x: auto;
+  border-radius: var(--border-radius);
+  border: 1px solid var(--border-color);
+}
+
+@media (max-width: 768px) {
+  table {
+    min-width: 600px;
+  }
+  
+  table th,
+  table td {
+    min-width: 100px;
+    padding: var(--spacing-xs);
+    font-size: 0.875rem;
+  }
+  
+  .delete-button {
+    width: 18px;
+    height: 18px;
+    font-size: 10px;
+  }
+  
+  #new-property {
+    width: 250px;
+  }
+}
+
+@media (max-width: 480px) {
+  table th,
+  table td {
+    min-width: 80px;
+    padding: 0.125rem;
+    font-size: 0.75rem;
+  }
+  
+  #new-property {
+    width: 200px;
+  }
+}
+
+/* =================================
+   UTILITY CLASSES
+   ================================= */
+
+.text-truncate {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.visually-hidden {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+/* =================================
+   ANIMATIONS
+   ================================= */
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+    transform: translateY(-10px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@keyframes slideIn {
+  from {
+    opacity: 0;
+    transform: translateX(-20px);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+.new-row {
+  animation: fadeIn 0.3s ease-in-out;
+}
+
+.slide-in {
+  animation: slideIn 0.2s ease-in-out;
+}
+
+/* =================================
+   ACCESSIBILITY IMPROVEMENTS
+   ================================= */
+
+/* Focus indicators */
+button:focus,
+input:focus,
+textarea:focus,
+select:focus {
+  outline: 2px solid var(--color-primary);
+  outline-offset: 2px;
+}
+
+/* Reduced motion for users who prefer it */
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+  }
+}
+
+/* High contrast mode support */
+@media (prefers-contrast: high) {
+  table th,
+  table td {
+    border-width: 2px;
+  }
+  
+  .delete-button {
+    border: 2px solid white;
+  }
+}
\ No newline at end of file
diff --git a/src/types/database.ts b/src/types/database.ts
index 76e23d9..7f45550 100644
--- a/src/types/database.ts
+++ b/src/types/database.ts
@@ -57,7 +57,7 @@ export interface PropertyResponse {
   globalUsageCount: number;
 }
 
-// Wikidata types (for future integration)
+// Wikidata types
 export interface WikidataSuggestion {
   id: string;
   label: string;