Advanced Web Development Path

:root {
    --primary-hue: 220;
    --primary-color: hsl(var(--primary-hue), 50%, 50%);
}

.container {
    width: clamp(300px, 80vw, 1200px);
    padding: min(5vw, 50px);
    background: color-mix(in srgb, 
        var(--primary-color) 20%, 
        white);
}

@keyframes parallax-scroll {
    to {
        transform: translate3d(0, -100%, 0);
    }
}

.scroll-animation {
    animation: parallax-scroll linear;
    animation-timeline: scroll();
    animation-range: entry 50% cover 50%;
}

const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.classList.add('visible');
            observer.unobserve(entry.target);
        }
    });
}, {
    threshold: 0.5,
    rootMargin: '50px'
});

class CustomCard extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({ mode: 'open' });
    }
    
    connectedCallback() {
        this.shadowRoot.innerHTML = `
            
            
        `;
    }
}