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

        body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
            background: #f4f4f4;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        h1 {
            text-align: center;
            margin-bottom: 40px;
            color: #333;
        }

        /* Portfolio Grid */
        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 80px;
        }

        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
            cursor: pointer;
            transition: transform 0.3s ease;
            background: white;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }

        .portfolio-item:hover {
            transform: translateY(-5px);
        }

        .portfolio-item img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            display: block;
        }

        .portfolio-item .overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.7);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .portfolio-item:hover .overlay {
            opacity: 1;
        }

        .overlay-text {
            color: white;
            font-size: 18px;
            font-weight: bold;
        }

        /* Lightbox Styles */
        .lightbox {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.9);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }

        .lightbox.active {
            display: flex;
        }

        .lightbox-content {
            position: relative;
            max-width: 90%;
            max-height: 90%;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }

        .lightbox img {
            width: 100%;
            height: auto;
            display: block;
            max-height: 90vh;
            object-fit: contain;
        }

        /* Close Button */
        .close-btn {
            position: absolute;
            top: 15px;
            right: 20px;
            font-size: 30px;
            color: white;
            background: rgba(0,0,0,0.5);
            border: none;
            border-radius: 50%;
            width: 45px;
            height: 45px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.3s ease;
        }

        .close-btn:hover {
            background: rgba(0,0,0,0.8);
        }

        /* Navigation Arrows */
        .nav-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            font-size: 24px;
            color: white;
            background: rgba(0,0,0,0.5);
            border: none;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.3s ease;
        }

        .nav-btn:hover {
            background: rgba(0,0,0,0.8);
        }

        .prev-btn {
            left: 20px;
        }

        .next-btn {
            right: 20px;
        }

        /* Loading Animation */
        .loading {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 40px;
            height: 40px;
            border: 4px solid #f3f3f3;
            border-top: 4px solid #3498db;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: translate(-50%, -50%) rotate(0deg); }
            100% { transform: translate(-50%, -50%) rotate(360deg); }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .portfolio-grid {
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
                gap: 15px;
            }

            .lightbox-content {
                max-width: 95%;
                max-height: 95%;
            }

            .lightbox-info {
                padding: 15px;
            }

            .nav-btn {
                width: 40px;
                height: 40px;
                font-size: 20px;
            }
        }