Style sheet change APP.CSS & INDEX.CSS

src/App.css

@@ -1,42 +1,181 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* =========================================
+   ROOT VARIABLES
+========================================= */
+
+:root {
+  --max-width: 1280px;
+
+  --primary-color: #646cff;
+  --react-color: #61dafb;
+
+  --text-muted: #94a3b8;
+
+  --card-bg: rgba(255, 255, 255, 0.05);
+  --card-border: rgba(255, 255, 255, 0.08);
+
+  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.1);
+  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.2);
+
+  --transition: 0.3s ease;
+  --radius: 1rem;
+}
+
+/* =========================================
+   GLOBAL STYLES
+========================================= */
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+
+  min-width: 320px;
+  min-height: 100vh;
+
+  font-family: Inter, sans-serif;
+
+  background: linear-gradient(
+    135deg,
+    #0f172a,
+    #111827
+  );
+
+  color: white;
+
+  -webkit-font-smoothing: antialiased;
+}
+
+/* =========================================
+   ROOT CONTAINER
+========================================= */
+
 #root {
-  max-width: 1280px;
-  margin: 0 auto;
+  max-width: var(--max-width);
+
+  margin-inline: auto;
+
   padding: 2rem;
+
   text-align: center;
 }
 
+/* =========================================
+   LOGO
+========================================= */
+
 .logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: filter 300ms;
+  height: 6rem;
+
+  padding: 1.25rem;
+
+  border-radius: 50%;
+
+  transition:
+    transform var(--transition),
+    filter var(--transition);
+
+  will-change: transform, filter;
 }
+
 .logo:hover {
-  filter: drop-shadow(0 0 2em #646cffaa);
+  transform: scale(1.05);
+
+  filter:
+    drop-shadow(0 0 2rem rgba(100, 108, 255, 0.6));
 }
+
 .logo.react:hover {
-  filter: drop-shadow(0 0 2em #61dafbaa);
+  filter:
+    drop-shadow(0 0 2rem rgba(97, 218, 251, 0.7));
 }
 
+/* =========================================
+   SPIN ANIMATION
+========================================= */
+
 @keyframes logo-spin {
   from {
     transform: rotate(0deg);
   }
+
   to {
     transform: rotate(360deg);
   }
 }
 
+/* Motion-safe animation */
+
 @media (prefers-reduced-motion: no-preference) {
-  a:nth-of-type(2) .logo {
-    animation: logo-spin infinite 20s linear;
+  .logo-spin {
+    animation:
+      logo-spin 20s linear infinite;
   }
 }
 
+/* =========================================
+   CARD
+========================================= */
+
 .card {
-  padding: 2em;
+  padding: 2rem;
+
+  margin-top: 2rem;
+
+  border-radius: var(--radius);
+
+  background: var(--card-bg);
+
+  border: 1px solid var(--card-border);
+
+  backdrop-filter: blur(12px);
+
+  box-shadow: var(--shadow-sm);
+
+  transition:
+    transform var(--transition),
+    box-shadow var(--transition);
 }
 
+.card:hover {
+  transform: translateY(-4px);
+
+  box-shadow: var(--shadow-md);
+}
+
+/* =========================================
+   TEXT
+========================================= */
+
 .read-the-docs {
-  color: #888;
+  margin-top: 1rem;
+
+  color: var(--text-muted);
+
+  font-size: 0.95rem;
+
+  line-height: 1.6;
 }
+
+/* =========================================
+   RESPONSIVE
+========================================= */
+
+@media (max-width: 768px) {
+  #root {
+    padding: 1rem;
+  }
+
+  .logo {
+    height: 4.5rem;
+  }
+
+  .card {
+    padding: 1.5rem;
+  }
+}