.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.popup-content {
    position: relative;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.popup-image {
    max-width: 90%;
    max-height: 80vh;
    border-radius: 8px;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #ff5f5f;
    color: #fff;
    border: none;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    line-height: 16px;
    transition: background 0.3s;
}

.close-btn:hover {
    background: #ff2d2d;
}

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #0a0a0a;
            color: #e0e0e0;
            line-height: 1.6;
            min-height: 100vh;
            padding: 20px;
            background-image: 
                radial-gradient(circle at 25% 25%, #1a1a1a 0%, transparent 20%),
                radial-gradient(circle at 75% 75%, #1a1a1a 0%, transparent 20%);
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
            background: #151515;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
        }
        
        header {
            padding: 20px 30px;
            background: #1a1a1a;
            color: #e0e0e0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid #2a2a2a;
        }
        
        .back-button {
            display: inline-flex;
            align-items: center;
            padding: 12px 25px;
            background: #252525;
            color: #e0e0e0;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 1px solid #333;
        }
        
        .back-button:hover {
            background: #333;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }
        
        .back-button i {
            margin-right: 10px;
            font-size: 1.2rem;
            color: #0066ff;
        }
        
        .iframe-container {
            height: 65vh;
            padding: 0;
            background: #000;
            margin-top: 20px;
        }
        
        iframe {
            width: 100%;
            height: 100%;
            border: none;
            background: #000;
        }
        
        .content {
            padding: 40px;
            background: #151515;
        }
        
        h1 {
            font-size: 2.5rem;
            color: #0066ff;
            margin-bottom: 15px;
            font-weight: 700;
        }
        
        h2 {
            font-size: 1.8rem;
            color: #e0e0e0;
            margin-bottom: 25px;
            font-weight: 500;
        }
        
        p {
            font-size: 1.1rem;
            margin-bottom: 20px;
            color: #a0a0a0;
        }
        
        .highlight {
            background: linear-gradient(120deg, #252525 0%, #1a1a1a 100%);
            padding: 30px;
            border-radius: 10px;
            margin: 30px 0;
            color: #e0e0e0;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            border-left: 4px solid #0066ff;
        }
        
        footer {
            text-align: center;
            padding: 20px;
            background: #1a1a1a;
            color: #a0a0a0;
            border-top: 1px solid #2a2a2a;
        }
        
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 30px;
        }
        
        .card {
            background: #1a1a1a;
            padding: 25px;
            border-radius: 10px;
            border: 1px solid #2a2a2a;
        }
        
        .card h3 {
            color: #4a6cf7;
            margin-bottom: 15px;
            font-size: 1.4rem;
        }
        
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .iframe-container {
                height: 100vh;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            h2 {
                font-size: 1.5rem;
            }
            
            .content {
                padding: 25px;
            }
            
            header {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }
        }