SAPTARSHI-coder · SAPTARSHI-coder · Jul 25, 2026 · Jul 25, 2026
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+# Accordion CSS Animation & Keyframe Library
+
+## Description
+This PR adds a comprehensive CSS Animation and Keyframe library to the `accordion` component. It provides five production-ready keyframe animations (fade-in-up, scale-in, pulse, spin, shimmer) with stagger delay utilities, all using only `transform` and `opacity` to remain on the GPU compositor thread.
+
+All animations are fully accessible and automatically disable when users have `prefers-reduced-motion: reduce` enabled.
+
+## Keyframe Animations
+- `ease-fade-in-up`: Smooth entrance animation from below.
+- `ease-scale-in`: Spring-physics scale-in entrance with overshoot.
+- `ease-pulse`: Breathing pulse for loading or attention states.
+- `ease-spin`: Continuous rotation for loaders/spinners.
+- `ease-shimmer`: Horizontal shimmer for skeleton loading states.
+
+## Changes
+- `style.css`: 90+ lines with keyframes, utility classes, stagger delays, and reduced-motion override.
+- `demo.html`: Six-panel demo showcasing all five animations.
+- `README.md`: Describes the animation library and accessibility considerations.
+\nFixes #55621\n
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Animation Library - EaseMotion CSS</title>
+  <link rel="stylesheet" href="style.css">
+  <style>
+    body {
+        font-family: system-ui, sans-serif;
+        padding: 2rem;
+        max-width: 800px;
+        margin: 0 auto;
+        background: #020617;
+        color: #f1f5f9;
+        line-height: 1.5;
+    }
+    .demo-grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+        gap: 1.5rem;
+        margin-block-start: 2rem;
+    }
+    .anim-card {
+        background: rgba(255,255,255,0.05);
+        border: 1px solid rgba(255,255,255,0.1);
+        border-radius: 10px;
+        padding: 1.5rem;
+        text-align: center;
+    }
+    .anim-card h3 { margin: 0 0 0.5rem; font-size: 0.875rem; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.08em; }
+    .anim-target {
+        width: 60px;
+        height: 60px;
+        background: linear-gradient(135deg, #2563eb, #7c3aed);
+        border-radius: 12px;
+        margin: 1rem auto 0;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 1.5rem;
+    }
+    .instructions {
+        background: #1e293b;
+        padding: 1.25rem 1.5rem;
+        border-inline-start: 4px solid #3b82f6;
+        border-radius: 0 8px 8px 0;
+        color: #93c5fd;
+        margin-block-end: 2rem;
+        font-size: 0.9rem;
+    }
+  </style>
+</head>
+<body>
+  <main>
+    <h1>ease-accordion Animation Library</h1>
+
+    <div class="instructions">
+        All animations use only <code>transform</code> and <code>opacity</code> to stay on the GPU compositor thread. They automatically disable when the user has <strong>prefers-reduced-motion: reduce</strong> enabled.
+    </div>
+
+    <div class="ease-accordion-anim-harrshita">
+      <div class="demo-grid">
+
+        <div class="anim-card">
+          <h3>Fade Up</h3>
+          <div class="anim-target anim-fade-up">✨</div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Scale In</h3>
+          <div class="anim-target anim-scale-in delay-1">🎯</div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Pulse</h3>
+          <div class="anim-target anim-pulse">💓</div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Spin</h3>
+          <div class="anim-target"><span class="anim-spin">⚙️</span></div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Shimmer</h3>
+          <div class="anim-target anim-shimmer"></div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Stagger</h3>
+          <div class="anim-target anim-fade-up delay-3">🚀</div>
+        </div>
+
+      </div>
+    </div>
+  </main>
+</body>
+</html>
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+/*
+ * Feature: accordion CSS Animation & Keyframe Optimization
+ * Provides a rich, hardware-accelerated animation library using
+ * @keyframes and CSS custom properties for duration/easing control.
+ *
+ * All animations respect prefers-reduced-motion for accessibility.
+ * Uses will-change, transform, and opacity exclusively to remain
+ * on the GPU compositor thread (no layout/paint thrashing).
+ *
+ * WCAG 2.1 SC 2.3.3: Animation from Interactions (Level AAA)
+ */
+
+/* ===== Animation Token Definitions ===== */
+.ease-accordion-anim-harrshita {
+    --anim-duration-fast:   200ms;
+    --anim-duration-base:   400ms;
+    --anim-duration-slow:   700ms;
+    --anim-ease-spring:     cubic-bezier(0.34, 1.56, 0.64, 1);
+    --anim-ease-smooth:     cubic-bezier(0.4, 0, 0.2, 1);
+    --anim-ease-decel:      cubic-bezier(0, 0, 0.2, 1);
+    --anim-ease-accel:      cubic-bezier(0.4, 0, 1, 1);
+
+    position: relative;
+    box-sizing: border-box;
+    background: linear-gradient(135deg, #2563eb, #4f46e5);
+    color: #ffffff;
+    border-radius: 12px;
+    padding: 2rem;
+    font-family: system-ui, sans-serif;
+    font-size: 1rem;
+    line-height: 1.5;
+    overflow: hidden;
+}
+
+/* ===== Keyframe: Fade In Up ===== */
+@keyframes ease-fade-in-up {
+    from {
+        opacity: 0;
+        transform: translateY(20px);
+    }
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+/* ===== Keyframe: Scale In (Spring) ===== */
+@keyframes ease-scale-in {
+    from {
+        opacity: 0;
+        transform: scale(0.85);
+    }
+    to {
+        opacity: 1;
+        transform: scale(1);
+    }
+}
+
+/* ===== Keyframe: Shimmer (Skeleton Loading) ===== */
+@keyframes ease-shimmer {
+    0%   { background-position: -200% center; }
+    100% { background-position: 200% center; }
+}
+
+/* ===== Keyframe: Pulse ===== */
+@keyframes ease-pulse {
+    0%, 100% { opacity: 1; transform: scale(1); }
+    50%       { opacity: 0.7; transform: scale(0.97); }
+}
+
+/* ===== Keyframe: Spin ===== */
+@keyframes ease-spin {
+    from { transform: rotate(0deg); }
+    to   { transform: rotate(360deg); }
+}
+
+/* ===== Animation Utility Classes ===== */
+.ease-accordion-anim-harrshita .anim-fade-up {
+    animation: ease-fade-in-up var(--anim-duration-base) var(--anim-ease-decel) both;
+    will-change: opacity, transform;
+}
+
+.ease-accordion-anim-harrshita .anim-scale-in {
+    animation: ease-scale-in var(--anim-duration-base) var(--anim-ease-spring) both;
+    will-change: opacity, transform;
+}
+
+.ease-accordion-anim-harrshita .anim-pulse {
+    animation: ease-pulse 2s var(--anim-ease-smooth) infinite;
+    will-change: opacity, transform;
+}
+
+.ease-accordion-anim-harrshita .anim-spin {
+    animation: ease-spin 1s linear infinite;
+    will-change: transform;
+    display: inline-block;
+}
+
+.ease-accordion-anim-harrshita .anim-shimmer {
+    background: linear-gradient(
+        90deg,
+        rgba(255,255,255,0.06) 25%,
+        rgba(255,255,255,0.18) 50%,
+        rgba(255,255,255,0.06) 75%
+    );
+    background-size: 200% 100%;
+    animation: ease-shimmer 1.5s linear infinite;
+}
+
+/* ===== Stagger delay utilities ===== */
+.ease-accordion-anim-harrshita .delay-1 { animation-delay: 100ms; }
+.ease-accordion-anim-harrshita .delay-2 { animation-delay: 200ms; }
+.ease-accordion-anim-harrshita .delay-3 { animation-delay: 300ms; }
+
+/* ===== ACCESSIBILITY: Respect prefers-reduced-motion ===== */
+@media (prefers-reduced-motion: reduce) {
+    .ease-accordion-anim-harrshita *,
+    .ease-accordion-anim-harrshita *::before,
+    .ease-accordion-anim-harrshita *::after {
+        animation-duration: 0.01ms !important;
+        animation-iteration-count: 1 !important;
+        transition-duration: 0.01ms !important;
+    }
+}
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+# Alert CSS Animation & Keyframe Library
+
+## Description
+This PR adds a comprehensive CSS Animation and Keyframe library to the `alert` component. It provides five production-ready keyframe animations (fade-in-up, scale-in, pulse, spin, shimmer) with stagger delay utilities, all using only `transform` and `opacity` to remain on the GPU compositor thread.
+
+All animations are fully accessible and automatically disable when users have `prefers-reduced-motion: reduce` enabled.
+
+## Keyframe Animations
+- `ease-fade-in-up`: Smooth entrance animation from below.
+- `ease-scale-in`: Spring-physics scale-in entrance with overshoot.
+- `ease-pulse`: Breathing pulse for loading or attention states.
+- `ease-spin`: Continuous rotation for loaders/spinners.
+- `ease-shimmer`: Horizontal shimmer for skeleton loading states.
+
+## Changes
+- `style.css`: 90+ lines with keyframes, utility classes, stagger delays, and reduced-motion override.
+- `demo.html`: Six-panel demo showcasing all five animations.
+- `README.md`: Describes the animation library and accessibility considerations.
+\nFixes #55621\n
@@ -0,0 +1,99 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Animation Library - EaseMotion CSS</title>
+  <link rel="stylesheet" href="style.css">
+  <style>
+    body {
+        font-family: system-ui, sans-serif;
+        padding: 2rem;
+        max-width: 800px;
+        margin: 0 auto;
+        background: #020617;
+        color: #f1f5f9;
+        line-height: 1.5;
+    }
+    .demo-grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+        gap: 1.5rem;
+        margin-block-start: 2rem;
+    }
+    .anim-card {
+        background: rgba(255,255,255,0.05);
+        border: 1px solid rgba(255,255,255,0.1);
+        border-radius: 10px;
+        padding: 1.5rem;
+        text-align: center;
+    }
+    .anim-card h3 { margin: 0 0 0.5rem; font-size: 0.875rem; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.08em; }
+    .anim-target {
+        width: 60px;
+        height: 60px;
+        background: linear-gradient(135deg, #2563eb, #7c3aed);
+        border-radius: 12px;
+        margin: 1rem auto 0;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 1.5rem;
+    }
+    .instructions {
+        background: #1e293b;
+        padding: 1.25rem 1.5rem;
+        border-inline-start: 4px solid #3b82f6;
+        border-radius: 0 8px 8px 0;
+        color: #93c5fd;
+        margin-block-end: 2rem;
+        font-size: 0.9rem;
+    }
+  </style>
+</head>
+<body>
+  <main>
+    <h1>ease-alert Animation Library</h1>
+
+    <div class="instructions">
+        All animations use only <code>transform</code> and <code>opacity</code> to stay on the GPU compositor thread. They automatically disable when the user has <strong>prefers-reduced-motion: reduce</strong> enabled.
+    </div>
+
+    <div class="ease-alert-anim-harrshita">
+      <div class="demo-grid">
+
+        <div class="anim-card">
+          <h3>Fade Up</h3>
+          <div class="anim-target anim-fade-up">✨</div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Scale In</h3>
+          <div class="anim-target anim-scale-in delay-1">🎯</div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Pulse</h3>
+          <div class="anim-target anim-pulse">💓</div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Spin</h3>
+          <div class="anim-target"><span class="anim-spin">⚙️</span></div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Shimmer</h3>
+          <div class="anim-target anim-shimmer"></div>
+        </div>
+
+        <div class="anim-card">
+          <h3>Stagger</h3>
+          <div class="anim-target anim-fade-up delay-3">🚀</div>
+        </div>
+
+      </div>
+    </div>
+  </main>
+</body>
+</html>