Complete Phase 4: Interactive Enhancements - Implemented transitions system, animations, loading states, loading indicators, hover states, form validation, notification variants, micro-interactions, accessibility improvements

static/css/utilities.css

@@ -15,6 +15,61 @@
     }
 }
 
+@keyframes slideOut {
+    to {
+        opacity: 0;
+        transform: translateX(100%);
+    }
+}
+
+@keyframes fadeIn {
+    from {
+        opacity: 0;
+    }
+    to {
+        opacity: 1;
+    }
+}
+
+@keyframes fadeOut {
+    to {
+        opacity: 0;
+    }
+}
+
+@keyframes slideInFromBottom {
+    from {
+        opacity: 0;
+        transform: translateY(20px);
+    }
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+@keyframes slideInFromTop {
+    from {
+        opacity: 0;
+        transform: translateY(-20px);
+    }
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+@keyframes scaleIn {
+    from {
+        opacity: 0;
+        transform: scale(0.95);
+    }
+    to {
+        opacity: 1;
+        transform: scale(1);
+    }
+}
+
 @keyframes pulse {
     0%, 100% {
         opacity: 1;
@@ -42,11 +97,154 @@
     }
 }
 
-@keyframes slideOut {
-    to {
-        opacity: 0;
-        transform: translateX(100%);
+@keyframes spin {
+    from {
+        transform: rotate(0deg);
     }
+    to {
+        transform: rotate(360deg);
+    }
+}
+
+@keyframes shimmer {
+    0% {
+        background-position: -468px 0;
+    }
+    100% {
+        background-position: 468px 0;
+    }
+}
+
+/* =================================================================
+   TRANSITIONS UTILITY SYSTEM - Consistent transitions
+   ================================================================= */
+
+/* Transition duration constants */
+.transition-none {
+    transition: none;
+}
+
+.transition-fast {
+    transition-duration: var(--transition-fast);
+}
+
+.transition-base {
+    transition-duration: var(--transition-base);
+}
+
+.transition-slow {
+    transition-duration: var(--transition-slow);
+}
+
+/* Transition properties - individual */
+.transition-all {
+    transition-property: all;
+    transition-duration: var(--transition-base);
+    transition-timing-function: var(--ease-in-out);
+}
+
+.transition-colors {
+    transition-property: color, background-color, border-color, text-decoration-color, fill, stroke;
+    transition-duration: var(--transition-base);
+    transition-timing-function: var(--ease-in-out);
+}
+
+.transition-transform {
+    transition-property: transform;
+    transition-duration: var(--transition-base);
+    transition-timing-function: var(--ease-in-out);
+}
+
+.transition-opacity {
+    transition-property: opacity;
+    transition-duration: var(--transition-base);
+    transition-timing-function: var(--ease-in-out);
+}
+
+.transition-shadow {
+    transition-property: box-shadow;
+    transition-duration: var(--transition-base);
+    transition-timing-function: var(--ease-in-out);
+}
+
+.transition-hover {
+    transition: all var(--transition-base) var(--ease-in-out);
+}
+
+/* Micro-interaction feedback */
+.hover-lift {
+    transition: transform var(--transition-fast) var(--ease-out);
+}
+
+.hover-lift:hover {
+    transform: translateY(-2px);
+}
+
+.interaction-press {
+    transition: transform var(--transition-fast) var(--ease-out);
+}
+
+.interaction-press:active {
+    transform: translateY(0) scale(0.98);
+}
+
+/* =================================================================
+   ANIMATION UTILITY CLASSES - Enter/exit animations
+   ================================================================= */
+
+/* Slide animations */
+.animate-slide-in {
+    animation: slideIn var(--transition-slow) var(--ease-in-out);
+}
+
+.animate-slide-out {
+    animation: slideOut var(--transition-fast) var(--ease-in-out);
+}
+
+.animate-fade-in {
+    animation: fadeIn var(--transition-base) var(--ease-in-out);
+}
+
+.animate-fade-out {
+    animation: fadeOut var(--transition-fast) var(--ease-in-out);
+}
+
+.animate-slide-in-bottom {
+    animation: slideInFromBottom var(--transition-base) var(--ease-out);
+}
+
+.animate-slide-in-top {
+    animation: slideInFromTop var(--transition-base) var(--ease-out);
+}
+
+.animate-scale-in {
+    animation: scaleIn var(--transition-base) var(--ease-out);
+}
+
+/* Continuous animations */
+.animate-pulse {
+    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
+}
+
+.animate-bounce {
+    animation: bounce 1s infinite;
+}
+
+.animate-spin {
+    animation: spin 1s linear infinite;
+}
+
+/* Delayed animations for staggered effects */
+.animate-delay-1 {
+    animation-delay: 0.1s;
+}
+
+.animate-delay-2 {
+    animation-delay: 0.2s;
+}
+
+.animate-delay-3 {
+    animation-delay: 0.3s;
 }
 
 /* =================================================================