style: step 간 화살표 제거

src/pages/PartsCertification/PartsCertification.css

@@ -91,17 +91,6 @@
     justify-content: center;
 }
 
-.step-item:not(:last-child)::after {
-    content: '→';
-    position: absolute;
-    right: -1rem;
-    top: 50%;
-    transform: translateY(-50%);
-    color: var(--primary-color);
-    font-size: 1.2rem;
-    z-index: 1;
-}
-
 .step-item:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-sm);
@@ -165,15 +154,6 @@
         padding: 1.2rem;
     }
 
-    .step-item:not(:last-child)::after {
-        content: '↓';
-        position: absolute;
-        bottom: -1.25rem;
-        left: 50%;
-        top: auto;
-        transform: translateX(-50%);
-    }
-
     .step-number {
         margin-bottom: 0;
         min-width: 80px;