タブメニュー：レトロゲーミング｜Tab Menu: Retro Gaming

<div class="container">
    <h1>Tab Design 10 - Retro Gaming</h1>
    
    <div class="tab-container">
        <ul>
            <li class="selected" data-id="tab-1">Tab 1</li>
            <li data-id="tab-2">Tab 2</li>
            <li data-id="tab-3">Tab 3</li>
        </ul>
        <div class="tab-content selected" id="tab-1">
            Good morning. This is the content of Tab 1.
        </div>
        <div class="tab-content" id="tab-2">
            Hello. This is the content of Tab 2.
        </div>
        <div class="tab-content" id="tab-3">
            Good evening. This is the content of Tab 3.
        </div>
    </div>
</div>

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #0a0a0a;
    padding: 20px;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 255, 0, 0.02) 2px,
            rgba(0, 255, 0, 0.02) 4px
        );
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: #000;
    border: 3px solid #00ff00;
    border-radius: 8px;
    box-shadow: 
        0 0 30px rgba(0, 255, 0, 0.5),
        inset 0 0 30px rgba(0, 255, 0, 0.1);
    overflow: hidden;
    position: relative;
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 255, 0, 0.03) 2px,
            rgba(0, 255, 0, 0.03) 4px
        );
    pointer-events: none;
    z-index: 1;
}

h1 {
    text-align: center;
    padding: 30px 20px;
    background: #000;
    color: #00ff00;
    margin: 0;
    border-bottom: 2px solid #00ff00;
    font-family: 'Orbitron', 'Courier New', 'Courier', monospace;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-shadow: 0 0 10px rgba(0, 255, 0, 0.8);
    position: relative;
    z-index: 2;
}

h1::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #00ff00 50%, 
        transparent 100%);
    animation: scanLine 2s linear infinite;
}

@keyframes scanLine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ===== Design 10: Retro Gaming ===== */
.tab-container {
    overflow: hidden;
    border-radius: 8px;
    position: relative;
    background: #0a0a0a;
    border: 3px solid #00ff00;
    box-shadow: 
        0 0 20px rgba(0, 255, 0, 0.5),
        inset 0 0 20px rgba(0, 255, 0, 0.1);
    z-index: 2;
}

.tab-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 255, 0, 0.03) 2px,
            rgba(0, 255, 0, 0.03) 4px
        );
    pointer-events: none;
    z-index: 1;
}

.tab-container ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    background: #000;
    border-bottom: 2px solid #00ff00;
    position: relative;
    z-index: 2;
}

.tab-container ul::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #00ff00 50%, 
        transparent 100%);
    animation: scanLine 2s linear infinite;
}

.tab-container ul li {
    flex: 1;
    padding: 16px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    color: #00ff00;
    font-family: 'Orbitron', 'Courier New', 'Courier', monospace;
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-right: 1px solid #00ff00;
    background: #000;
    overflow: hidden;
}

.tab-container ul li:last-child {
    border-right: none;
}

.tab-container ul li::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(0, 255, 0, 0.2) 50%, 
        transparent 100%);
    transition: left 0.5s ease;
}

.tab-container ul li:hover::before {
    left: 100%;
}

.tab-container ul li.selected {
    color: #000;
    background: #00ff00;
    box-shadow: 
        0 0 15px rgba(0, 255, 0, 0.8),
        inset 0 0 10px rgba(0, 0, 0, 0.3);
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    animation: selectedPulse 1.5s ease-in-out infinite alternate;
}

@keyframes selectedPulse {
    from { 
        box-shadow: 
            0 0 15px rgba(0, 255, 0, 0.8),
            inset 0 0 10px rgba(0, 0, 0, 0.3);
    }
    to { 
        box-shadow: 
            0 0 25px rgba(0, 255, 0, 1),
            inset 0 0 10px rgba(0, 0, 0, 0.3);
    }
}

.tab-container ul li.selected::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: #00ff00;
    box-shadow: 0 0 10px rgba(0, 255, 0, 0.8);
}

.tab-container ul li:not(.selected):hover {
    background: rgba(0, 255, 0, 0.1);
    color: #00ff00;
    text-shadow: 0 0 8px rgba(0, 255, 0, 0.8);
    transform: translateY(-1px);
}

.tab-container .tab-content {
    display: none;
    padding: 24px;
    min-height: 150px;
    background: #000;
    color: #00ff00;
    font-family: 'Orbitron', 'Courier New', 'Courier', monospace;
    font-size: 14px;
    line-height: 1.6;
    position: relative;
    z-index: 2;
    border: 1px solid #00ff00;
    border-top: none;
}

.tab-container .tab-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #00ff00 50%, 
        transparent 100%);
    animation: scanLine 3s linear infinite;
}

.tab-container .tab-content::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 255, 0, 0.02) 2px,
            rgba(0, 255, 0, 0.02) 4px
        );
    pointer-events: none;
}

.tab-container .tab-content.selected {
    display: block;
    animation: retroFadeIn 0.4s ease;
}

@keyframes retroFadeIn {
    from { 
        opacity: 0; 
        transform: translateY(-10px);
        filter: blur(2px);
    }
    to { 
        opacity: 1; 
        transform: translateY(0);
        filter: blur(0);
    }
}

/* レトロゲーミング風のタイピングエフェクト */
.tab-container .tab-content.selected::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(0, 255, 0, 0.1) 50%, 
        transparent 100%);
    animation: typingEffect 2s ease-in-out infinite;
}

@keyframes typingEffect {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
}

// Get tab container
const tabContainer = document.querySelector('.tab-container');
const tabMenuItems = tabContainer.querySelectorAll('ul li');
const tabContents = tabContainer.querySelectorAll('.tab-content');

// Set event listeners for each tab menu item
tabMenuItems.forEach(tabMenuItem => {
    tabMenuItem.addEventListener('click', () => {
        // Remove selected class from all tabs
        tabMenuItems.forEach(item => {
            item.classList.remove('selected');
        });
        
        // Add selected class only to clicked tab
        tabMenuItem.classList.add('selected');
        
        // Remove selected class from all tab contents
        tabContents.forEach(tabContent => {
            tabContent.classList.remove('selected');
        });

        // Add selected class to content with same ID as clicked tab's data attribute
        document.getElementById(tabMenuItem.dataset.id).classList.add('selected');
    });
});