Javascript Scroll Page to Element id

<script type="module" src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.esm.js"></script>
    <script nomodule src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.js"></script>
 
    <!-- Navigation -->
    <nav>
        <div class="nav-container">
            <div class="logo">ScrollDemo</div>
            <div class="nav-links">
                <button class="nav-btn" onclick="scrollToElement('home')">
                    <ion-icon name="home-outline"></ion-icon>
                    Home
                </button>
                <button class="nav-btn" onclick="scrollToElement('about')">
                    <ion-icon name="person-outline"></ion-icon>
                    About
                </button>
                <button class="nav-btn" onclick="scrollToElement('services')">
                    <ion-icon name="briefcase-outline"></ion-icon>
                    Services
                </button>
                <button class="nav-btn" onclick="scrollToElement('portfolio')">
                    <ion-icon name="images-outline"></ion-icon>
                    Portfolio
                </button>
                <button class="nav-btn" onclick="scrollToElement('contact')">
                    <ion-icon name="mail-outline"></ion-icon>
                    Contact
                </button>
            </div>
        </div>
    </nav>

    <!-- Home Section -->
    <section id="home">
        <div class="section-content">
            <h2>Welcome to ScrollDemo</h2>
            <p>Click any navigation button above to smoothly scroll to different sections of the page. This demo showcases JavaScript's scroll-to-element functionality with smooth animations.</p>
            <div class="scroll-indicator">
                <ion-icon name="arrow-down-outline"></ion-icon>
                Scroll down to explore
            </div>
        </div>
    </section>

    <!-- About Section -->
    <section id="about">
        <div class="section-content">
            <h2>About Section</h2>
            <p>This section demonstrates how JavaScript can scroll to specific elements by their ID. The scrolling is smooth and animated, providing a better user experience.</p>
            <div class="feature-grid">
                <div class="feature-card">
                    <ion-icon name="flash-outline"></ion-icon>
                    <h3>Fast</h3>
                    <p>Instant navigation to any section</p>
                </div>
                <div class="feature-card">
                    <ion-icon name="color-palette-outline"></ion-icon>
                    <h3>Smooth</h3>
                    <p>Beautiful scroll animations</p>
                </div>
                <div class="feature-card">
                    <ion-icon name="phone-portrait-outline"></ion-icon>
                    <h3>Responsive</h3>
                    <p>Works on all devices</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Services Section -->
    <section id="services">
        <div class="section-content">
            <h2>Services Section</h2>
            <p>The scroll functionality works with multiple methods: element.scrollIntoView() for smooth scrolling, and window.scrollTo() for precise positioning. Both methods are demonstrated in this page.</p>
            <div class="scroll-indicator">
                <ion-icon name="code-outline"></ion-icon>
                Powered by JavaScript
            </div>
        </div>
    </section>

    <!-- Portfolio Section -->
    <section id="portfolio">
        <div class="section-content">
            <h2>Portfolio Section</h2>
            <p>Each section has a unique ID attribute that JavaScript uses as a target. When you click a navigation button, the page smoothly scrolls to bring that section into view.</p>
            <div class="feature-grid">
                <div class="feature-card">
                    <ion-icon name="rocket-outline"></ion-icon>
                    <h3>Method 1</h3>
                    <p>scrollIntoView() with smooth behavior</p>
                </div>
                <div class="feature-card">
                    <ion-icon name="settings-outline"></ion-icon>
                    <h3>Method 2</h3>
                    <p>Custom offset calculations</p>
                </div>
                <div class="feature-card">
                    <ion-icon name="checkmark-circle-outline"></ion-icon>
                    <h3>Best Practice</h3>
                    <p>Accessibility-friendly scrolling</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Contact Section -->
    <section id="contact">
        <div class="section-content">
            <h2>Contact Section</h2>
            <p>You've reached the bottom! Notice the scroll-to-top button that appears. Click it to smoothly return to the home section. This demonstrates how scrolling can enhance navigation in long-form content.</p>
        </div>
    </section>

    <!-- Scroll to Top Button -->
    <button class="scroll-top" id="scrollTopBtn" onclick="scrollToElement('home')">
        <ion-icon name="arrow-up-outline"></ion-icon>
    </button>

  * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: #333;
        }

        /* Navigation Bar */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            z-index: 1000;
            padding: 0 20px;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: #8B4513;
        }

        .nav-links {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .nav-btn {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
        }

        .nav-btn:hover {
            background: linear-gradient(135deg, #6F3609 0%, #8B4513 100%);
            transform: translateY(-2px);
        }

        .nav-btn ion-icon {
            font-size: 18px;
        }

        /* Sections */
        section {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 100px 20px 60px;
        }

        .section-content {
            max-width: 800px;
            text-align: center;
        }

        section h2 {
            font-size: 48px;
            margin-bottom: 20px;
            color: #333;
        }

        section p {
            font-size: 18px;
            color: #666;
            margin-bottom: 30px;
            line-height: 1.8;
        }

        .scroll-indicator {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 8px;
            color: white;
            font-weight: 500;
            margin-top: 20px;
        }

        .scroll-indicator ion-icon {
            font-size: 24px;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% {
                transform: translateY(0);
            }
            40% {
                transform: translateY(-10px);
            }
            60% {
                transform: translateY(-5px);
            }
        }

        /* Section Colors */
        #home {
            background: linear-gradient(135deg, #6F4E37 0%, #8B6F47 100%);
            color: white;
        }

        #home h2,
        #home p {
            color: white;
        }

        #about {
            background: linear-gradient(135deg, #D2B48C 0%, #F5DEB3 100%);
        }

        #services {
            background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%);
            color: white;
        }

        #services h2,
        #services p {
            color: white;
        }

        #portfolio {
            background: linear-gradient(135deg, #DEB887 0%, #F4A460 100%);
        }

        #contact {
            background: linear-gradient(135deg, #654321 0%, #8B4513 100%);
            color: white;
        }

        #contact h2,
        #contact p {
            color: white;
        }

        /* Scroll to Top Button */
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%);
            color: white;
            border: none;
            border-radius: 50%;
            font-size: 24px;
            cursor: pointer;
            display: none;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            transition: all 0.3s;
            z-index: 999;
        }

        .scroll-top:hover {
            background: linear-gradient(135deg, #6F3609 0%, #8B4513 100%);
            transform: translateY(-5px);
        }

        .scroll-top.show {
            display: flex;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .feature-card {
            background: white;
            padding: 24px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: transform 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-5px);
        }

        .feature-card ion-icon {
            font-size: 48px;
            color: #8B4513;
            margin-bottom: 12px;
        }

        .feature-card h3 {
            font-size: 20px;
            margin-bottom: 8px;
            color: #333;
        }

        .feature-card p {
            font-size: 14px;
            color: #666;
        }

        @media (max-width: 768px) {
            section h2 {
                font-size: 36px;
            }

            .nav-links {
                gap: 8px;
            }

            .nav-btn {
                padding: 8px 16px;
                font-size: 13px;
            }
        }

        // Method 1: Scroll to element using scrollIntoView with smooth animation
        function scrollToElement(elementId) {
            const element = document.getElementById(elementId);
            if (element) {
                // Use smooth scrolling with proper timing
                element.scrollIntoView({
                    behavior: 'smooth',
                    block: 'start',
                    inline: 'nearest'
                });
            }
        }

        // Alternative Method 2: Scroll using animated scrollTo
        function scrollToElementWithOffset(elementId, offset = 80) {
            const element = document.getElementById(elementId);
            if (element) {
                const elementPosition = element.getBoundingClientRect().top;
                const offsetPosition = elementPosition + window.pageYOffset - offset;

                window.scrollTo({
                    top: offsetPosition,
                    behavior: 'smooth'
                });
            }
        }

        // Method 3: Custom smooth scroll animation for maximum browser compatibility
        function smoothScrollTo(elementId, duration = 800) {
            const element = document.getElementById(elementId);
            if (!element) return;

            const targetPosition = element.getBoundingClientRect().top + window.pageYOffset - 80;
            const startPosition = window.pageYOffset;
            const distance = targetPosition - startPosition;
            let startTime = null;

            function animation(currentTime) {
                if (startTime === null) startTime = currentTime;
                const timeElapsed = currentTime - startTime;
                const run = easeInOutCubic(timeElapsed, startPosition, distance, duration);
                window.scrollTo(0, run);
                if (timeElapsed < duration) requestAnimationFrame(animation);
            }

            function easeInOutCubic(t, b, c, d) {
                t /= d / 2;
                if (t < 1) return c / 2 * t * t * t + b;
                t -= 2;
                return c / 2 * (t * t * t + 2) + b;
            }

            requestAnimationFrame(animation);
        }

        // Show/hide scroll-to-top button based on scroll position
        window.addEventListener('scroll', function() {
            const scrollTopBtn = document.getElementById('scrollTopBtn');
            if (window.pageYOffset > 300) {
                scrollTopBtn.classList.add('show');
            } else {
                scrollTopBtn.classList.remove('show');
            }
        });

        // Optional: Handle URL hash navigation
        window.addEventListener('load', function() {
            if (window.location.hash) {
                const targetId = window.location.hash.substring(1);
                setTimeout(() => scrollToElement(targetId), 100);
            }
        });