html expand collapse text without javascript

<div class="container">
        <div class="card">
            <h1>Expandable Sections</h1>
            
            <div class="accordion-item">
                <input type="checkbox" id="section1" class="accordion-input">
                <label for="section1" class="accordion-label">What is HTML?</label>
                <div class="accordion-content">
                    <p>HTML (HyperText Markup Language) is the standard markup language for creating web pages. It describes the structure of a web page semantically and originally included cues for the appearance of the document.</p>
                </div>
            </div>

            <div class="accordion-item">
                <input type="checkbox" id="section2" class="accordion-input">
                <label for="section2" class="accordion-label">What is CSS?</label>
                <div class="accordion-content">
                    <p>CSS (Cascading Style Sheets) is a style sheet language used for describing the presentation of a document written in HTML. CSS describes how elements should be rendered on screen, on paper, in speech, or on other media.</p>
                </div>
            </div>

            <div class="accordion-item">
                <input type="checkbox" id="section3" class="accordion-input">
                <label for="section3" class="accordion-label">Pure CSS Solution</label>
                <div class="accordion-content">
                    <p>This accordion is built using only HTML and CSS, with no JavaScript required. It uses the checkbox input hack combined with the :checked pseudo-class and adjacent sibling selectors to toggle content visibility.</p>
                </div>
            </div>

            <div class="accordion-item">
                <input type="checkbox" id="section4" class="accordion-input">
                <label for="section4" class="accordion-label">Responsive Design</label>
                <div class="accordion-content">
                    <p>The design is fully responsive and works seamlessly across all device sizes. The smooth transitions and hover effects enhance the user experience while maintaining a professional and minimal aesthetic.</p>
                </div>
            </div>

            <p class="info-text">No JavaScript required • Pure CSS solution</p>
        </div>
    </div>

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #7B3F00 0%, #4a2600 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            max-width: 700px;
            width: 100%;
        }

        .card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
        }

        h1 {
            color: #7B3F00;
            margin-bottom: 30px;
            font-size: 28px;
            text-align: center;
        }

        .accordion-item {
            margin-bottom: 15px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .accordion-item:hover {
            border-color: #7B3F00;
        }

        .accordion-input {
            display: none;
        }

        .accordion-label {
            display: block;
            padding: 18px 20px;
            background: linear-gradient(135deg, #7B3F00 0%, #5a2f00 100%);
            color: white;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            position: relative;
            user-select: none;
            transition: all 0.3s ease;
        }

        .accordion-label:hover {
            background: linear-gradient(135deg, #5a2f00 0%, #7B3F00 100%);
        }

        .accordion-label::after {
            content: '+';
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 24px;
            font-weight: bold;
            transition: transform 0.3s ease;
        }

        .accordion-input:checked + .accordion-label::after {
            content: '−';
            transform: translateY(-50%) rotate(180deg);
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            background: #f9f9f9;
        }

        .accordion-input:checked ~ .accordion-content {
            max-height: 500px;
            padding: 20px;
        }

        .accordion-content p {
            color: #333;
            line-height: 1.6;
            font-size: 15px;
        }

        .info-text {
            text-align: center;
            color: #666;
            font-size: 14px;
            margin-top: 20px;
            font-style: italic;
        }