antigravity-skills-reference/skills/frontend-slides/animation-patterns.md

Animation Patterns Reference

Use this reference when generating presentations. Match animations to the intended feeling.

Effect-to-Feeling Guide

Feeling	Animations	Visual Cues
Dramatic / Cinematic	Slow fade-ins (1-1.5s), large scale transitions (0.9 to 1), parallax scrolling	Dark backgrounds, spotlight effects, full-bleed images
Techy / Futuristic	Neon glow (box-shadow), glitch/scramble text, grid reveals	Particle systems (canvas), grid patterns, monospace accents, cyan/magenta/electric blue
Playful / Friendly	Bouncy easing (spring physics), floating/bobbing	Rounded corners, pastel/bright colors, hand-drawn elements
Professional / Corporate	Subtle fast animations (200-300ms), clean slides	Navy/slate/charcoal, precise spacing, data visualization focus
Calm / Minimal	Very slow subtle motion, gentle fades	High whitespace, muted palette, serif typography, generous padding
Editorial / Magazine	Staggered text reveals, image-text interplay	Strong type hierarchy, pull quotes, grid-breaking layouts, serif headlines + sans body

Entrance Animations

/* Fade + Slide Up (most versatile) */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-out-expo),
                transform 0.6s var(--ease-out-expo);
}
.visible .reveal {
    opacity: 1;
    transform: translateY(0);
}

/* Scale In */
.reveal-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s, transform 0.6s var(--ease-out-expo);
}

/* Slide from Left */
.reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s, transform 0.6s var(--ease-out-expo);
}

/* Blur In */
.reveal-blur {
    opacity: 0;
    filter: blur(10px);
    transition: opacity 0.8s, filter 0.8s var(--ease-out-expo);
}

Background Effects

/* Gradient Mesh — layered radial gradients for depth */
.gradient-bg {
    background:
        radial-gradient(ellipse at 20% 80%, rgba(120, 0, 255, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 255, 200, 0.2) 0%, transparent 50%),
        var(--bg-primary);
}

/* Noise Texture — inline SVG for grain */
.noise-bg {
    background-image: url("data:image/svg+xml,..."); /* Inline SVG noise */
}

/* Grid Pattern — subtle structural lines */
.grid-bg {
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

Interactive Effects

/* 3D Tilt on Hover — adds depth to cards/panels */
class TiltEffect {
    constructor(element) {
        this.element = element;
        this.element.style.transformStyle = 'preserve-3d';
        this.element.style.perspective = '1000px';

        this.element.addEventListener('mousemove', (e) => {
            const rect = this.element.getBoundingClientRect();
            const x = (e.clientX - rect.left) / rect.width - 0.5;
            const y = (e.clientY - rect.top) / rect.height - 0.5;
            this.element.style.transform = `rotateY(${x * 10}deg) rotateX(${-y * 10}deg)`;
        });

        this.element.addEventListener('mouseleave', () => {
            this.element.style.transform = 'rotateY(0) rotateX(0)';
        });
    }
}

Troubleshooting

Problem	Fix
Fonts not loading	Check Fontshare/Google Fonts URL; ensure font names match in CSS
Animations not triggering	Verify Intersection Observer is running; check .visible class is being added
Scroll snap not working	Ensure scroll-snap-type: y mandatory on html; each slide needs scroll-snap-align: start
Mobile issues	Disable heavy effects at 768px breakpoint; test touch events; reduce particle count
Performance issues	Use will-change sparingly; prefer transform/opacity animations; throttle scroll handlers