feat: add branded 404 page UI (Dev-Card#636)

Author: Yogender-verma

apps/web/src/pages/NotFound.css

@@ -1,52 +1,119 @@
 .not-found-container {
   min-height: 100vh;
   display: flex;
-  align-items: center;
   justify-content: center;
+  align-items: center;
+  background: #161616;
   padding: 2rem;
 }
 
 .not-found-card {
+  width: min(100%, 900px);
+  min-height: 650px;
+  background: #d5d5d5;
+  border-radius: 24px;
+  padding: 5rem 2rem;
   text-align: center;
-  padding: 3.5rem 2.5rem;
-  border-radius: var(--radius-xl);
-  width: min(100%, 480px);
+
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
 }
 
-.not-found-icon {
-  font-size: 3.5rem;
-  margin-bottom: 1rem;
+.not-found-subtitle {
+  font-size: 0.9rem;
+  font-weight: 600;
+  color: #555;
+  letter-spacing: 1px;
+  margin-bottom: 3rem;
+  text-transform: uppercase;
 }
 
-.not-found-card h1 {
-  font-size: clamp(4rem, 8vw, 6rem);
+.stone-404 {
+  font-size: clamp(8rem, 20vw, 14rem);
   font-weight: 900;
   line-height: 1;
-  margin-bottom: 0.5rem;
-  background: linear-gradient(135deg, var(--primary), var(--accent));
+  margin: 0;
+
+  color: #7b8793;
+
+  text-shadow:
+    8px 8px 0 #b0b0b0,
+    16px 16px 0 rgba(0, 0, 0, 0.15);
+
+  position: relative;
+
+  background: linear-gradient(
+    180deg,
+    #aab3bc 0%,
+    #8b949e 35%,
+    #727c87 70%,
+    #646c75 100%
+  );
+
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
 }
 
-.not-found-title {
-  font-size: 1.35rem;
+.back-home-btn {
+  margin-top: 3rem;
+
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+
+  padding: 0.9rem 2rem;
+
+  text-decoration: none;
   font-weight: 700;
-  font-family: 'Outfit', sans-serif;
-  margin-bottom: 0.75rem;
+  font-size: 0.95rem;
+
+  color: #404040;
+
+  background: linear-gradient(
+    180deg,
+    #a8adb3 0%,
+    #858d95 100%
+  );
+
+  border-radius: 8px;
+
+  box-shadow:
+    0 4px 0 #6d7379,
+    0 8px 16px rgba(0, 0, 0, 0.2);
+
+  transition: all 0.2s ease;
 }
 
-.not-found-desc {
-  color: var(--text-secondary);
-  line-height: 1.7;
-  margin-bottom: 2rem;
-  max-width: 360px;
-  margin-left: auto;
-  margin-right: auto;
+.back-home-btn:hover {
+  transform: translateY(-2px);
+
+  box-shadow:
+    0 6px 0 #6d7379,
+    0 12px 20px rgba(0, 0, 0, 0.25);
 }
 
-@media (max-width: 520px) {
+.back-home-btn:active {
+  transform: translateY(2px);
+
+  box-shadow:
+    0 2px 0 #6d7379,
+    0 4px 10px rgba(0, 0, 0, 0.2);
+}
+
+@media (max-width: 768px) {
   .not-found-card {
-    padding: 2.5rem 1.5rem;
+    min-height: 500px;
+    padding: 3rem 1rem;
   }
-}
+
+  .stone-404 {
+    font-size: clamp(6rem, 25vw, 10rem);
+  }
+
+  .not-found-subtitle {
+    font-size: 0.75rem;
+  }
+}

apps/web/src/pages/NotFound.tsx

@@ -4,17 +4,23 @@ import './NotFound.css';
 export default function NotFound() {
   return (
     <div className="not-found-container">
-      <div className="not-found-card glass" id="not-found-card">
-        <div className="not-found-icon">🔍</div>
-        <h1>404</h1>
-        <p className="not-found-title">Page not found</p>
-        <p className="not-found-desc">
-          The page you're looking for doesn't exist or has been moved.
+      <div className="not-found-card" id="not-found-card">
+        <p className="not-found-subtitle">
+          SORRY, WE CAN'T FIND THE PAGE YOU'RE LOOKING FOR.
+          <br />
+          ALL WE HAVE HERE IS JUST STONE
         </p>
-        <Link to="/" className="btn-primary" id="not-found-home-btn">
-          Back to Home
+
+        <h1 className="stone-404">404</h1>
+
+        <Link
+          to="/"
+          className="back-home-btn"
+          id="not-found-home-btn"
+        >
+          BACK HOME
         </Link>
       </div>
     </div>
   );
-}
+}