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diff --git a/css/04-external-css/styles.css b/css/04-external-css/styles.css
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+/* 1. Global design tokens (Variables) */
+:root {
+  --primary-color: #3498db;
+  --secondary-color: #2ecc71;
+  --text-dark: #2c3e50;
+  --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+  --border-radius: 8px;
+}
+
+/* 2. Base Element Resets */
+body {
+  font-family: var(--font-main);
+  color: var(--text-dark);
+  line-height: 1.6;
+  padding: 20px;
+}
+
+/* 3. Reusable Component Classes */
+.card {
+  border: 1px solid #e0e0e0;
+  border-radius: var(--border-radius);
+  padding: 20px;
+  margin-bottom: 15px;
+  box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.3);
+}
+
+.btn {
+  display: inline-block;
+  padding: 10px 20px;
+  font-size: 1rem;
+  font-weight: bold;
+  text-align: center;
+  text-decoration: none;
+  border-radius: var(--border-radius);
+  border: none;
+  cursor: pointer;
+  transition: opacity 0.2s ease;
+}
+
+.btn:hover {
+  opacity: 0.9;
+}
+
+/* 4. Reusable Modifier Classes */
+.btn-primary {
+  background-color: var(--primary-color);
+  color: white;
+}
+
+.btn-secondary {
+  background-color: var(--secondary-color);
+  color: white;
+}
+