feat: implement customizable Bitcoin logo with 3D rotation and interactive controls

src/style.css

@@ -0,0 +1,65 @@
+:root {
+  font-family: 'Inter', system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: dark;
+  color: rgba(255, 255, 255, 0.95);
+  background-color: #0f172a;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  /* Center vertically if content is small */
+  min-width: 320px;
+  min-height: 100vh;
+  background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
+  overflow-y: auto;
+  /* Ensure vertical scroll is allowed */
+}
+
+#app {
+  width: 100%;
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+h1 {
+  font-size: 4rem;
+  line-height: 1;
+  font-weight: 800;
+  margin-bottom: 0.5rem;
+  background: linear-gradient(to right, #f59e0b, #fbbf24);
+  -webkit-background-clip: text;
+  background-clip: text;
+  -webkit-text-fill-color: transparent;
+  filter: drop-shadow(0 0 10px rgba(245, 158, 11, 0.3));
+}
+
+p {
+  font-size: 1.25rem;
+  color: #94a3b8;
+  max-width: 600px;
+  margin: 0 auto 3rem;
+}
+
+.glass-card {
+  background: rgba(30, 41, 59, 0.5);
+  backdrop-filter: blur(12px);
+  -webkit-backdrop-filter: blur(12px);
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 24px;
+  padding: 3rem;
+  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
+  display: inline-block;
+}