autocomplete input using javascript

     <div class="container">
        <label class="label" for="autocomplete-input">Search Countries</label>
        <div class="autocomplete-wrapper">
            <div class="input-container">
                <input 
                    type="text" 
                    id="autocomplete-input" 
                    placeholder="Type to search..."
                    autocomplete="off"
                >
            </div>
            <div class="suggestions-list" id="suggestions-list"></div>
        </div>
    </div>

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #FFCBA4 0%, #FFA07A 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .container {
            width: 100%;
            max-width: 500px;
        }

        .autocomplete-wrapper {
            position: relative;
            width: 100%;
        }

        .input-container {
            position: relative;
            width: 100%;
        }

        #autocomplete-input {
            width: 100%;
            padding: 16px 20px;
            font-size: 16px;
            border: none;
            border-radius: 12px;
            background: white;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            outline: none;
            transition: all 0.3s ease;
        }

        #autocomplete-input:focus {
            box-shadow: 0 6px 30px rgba(0, 0, 0, 0.15);
            transform: translateY(-2px);
        }

        #autocomplete-input::placeholder {
            color: #aaa;
        }

        .suggestions-list {
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            width: 100%;
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            max-height: 300px;
            overflow-y: auto;
            display: none;
            z-index: 1000;
        }

        .suggestions-list.active {
            display: block;
        }

        .suggestion-item {
            padding: 14px 20px;
            cursor: pointer;
            transition: background-color 0.2s ease;
            border-bottom: 1px solid #f0f0f0;
        }

        .suggestion-item:last-child {
            border-bottom: none;
        }

        .suggestion-item:hover,
        .suggestion-item.highlighted {
            background: linear-gradient(135deg, #FFCBA4 0%, #FFD4B8 100%);
        }

        .suggestion-item mark {
            background-color: #FFE4CC;
            font-weight: 600;
            padding: 2px 0;
        }

        .no-results {
            padding: 14px 20px;
            color: #999;
            text-align: center;
        }

        .label {
            display: block;
            margin-bottom: 10px;
            color: white;
            font-size: 18px;
            font-weight: 500;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

   const countries = [
            'Afghanistan', 'Albania', 'Algeria', 'Andorra', 'Argentina', 'Australia',
            'Austria', 'Bangladesh', 'Belgium', 'Brazil', 'Bulgaria', 'Canada',
            'China', 'Colombia', 'Croatia', 'Cuba', 'Denmark', 'Egypt',
            'Finland', 'France', 'Germany', 'Greece', 'Hungary', 'Iceland',
            'India', 'Indonesia', 'Iran', 'Iraq', 'Ireland', 'Israel',
            'Italy', 'Japan', 'Jordan', 'Kenya', 'Kuwait', 'Lebanon',
            'Malaysia', 'Mexico', 'Morocco', 'Nepal', 'Netherlands', 'New Zealand',
            'Nigeria', 'Norway', 'Pakistan', 'Peru', 'Philippines', 'Poland',
            'Portugal', 'Qatar', 'Romania', 'Russia', 'Saudi Arabia', 'Singapore',
            'South Africa', 'South Korea', 'Spain', 'Sweden', 'Switzerland', 'Syria',
            'Thailand', 'Turkey', 'Ukraine', 'United Arab Emirates', 'United Kingdom',
            'United States', 'Venezuela', 'Vietnam', 'Yemen'
        ];

        const input = document.getElementById('autocomplete-input');
        const suggestionsList = document.getElementById('suggestions-list');
        let currentFocus = -1;

        input.addEventListener('input', function(e) {
            const val = this.value.trim();
            currentFocus = -1;
            
            if (!val) {
                suggestionsList.classList.remove('active');
                return;
            }

            const matches = countries.filter(country => 
                country.toLowerCase().includes(val.toLowerCase())
            );

            if (matches.length === 0) {
                suggestionsList.innerHTML = '<div class="no-results">No results found</div>';
                suggestionsList.classList.add('active');
                return;
            }

            suggestionsList.innerHTML = matches.map(country => {
                const regex = new RegExp(`(${val})`, 'gi');
                const highlighted = country.replace(regex, '<mark>$1</mark>');
                return `<div class="suggestion-item" data-value="${country}">${highlighted}</div>`;
            }).join('');

            suggestionsList.classList.add('active');
        });

        suggestionsList.addEventListener('click', function(e) {
            if (e.target.classList.contains('suggestion-item')) {
                input.value = e.target.dataset.value;
                suggestionsList.classList.remove('active');
            }
        });

        input.addEventListener('keydown', function(e) {
            const items = suggestionsList.getElementsByClassName('suggestion-item');
            
            if (e.key === 'ArrowDown') {
                e.preventDefault();
                currentFocus++;
                if (currentFocus >= items.length) currentFocus = 0;
                setActive(items);
            } else if (e.key === 'ArrowUp') {
                e.preventDefault();
                currentFocus--;
                if (currentFocus < 0) currentFocus = items.length - 1;
                setActive(items);
            } else if (e.key === 'Enter') {
                e.preventDefault();
                if (currentFocus > -1 && items[currentFocus]) {
                    input.value = items[currentFocus].dataset.value;
                    suggestionsList.classList.remove('active');
                }
            } else if (e.key === 'Escape') {
                suggestionsList.classList.remove('active');
            }
        });

        function setActive(items) {
            Array.from(items).forEach(item => item.classList.remove('highlighted'));
            if (items[currentFocus]) {
                items[currentFocus].classList.add('highlighted');
                items[currentFocus].scrollIntoView({ block: 'nearest' });
            }
        }

        document.addEventListener('click', function(e) {
            if (!e.target.closest('.autocomplete-wrapper')) {
                suggestionsList.classList.remove('active');
            }
        });