body {
            margin: 0;
            font-family: Arial, Helvetica, sans-serif;
            background-color: #f4f8fd;
            color: #237A9B;
        }

        header {
            background-color: #237A9B;
            color: white;
            padding: 20px;
            text-align: center;
            top: 0;
            position: sticky;
            padding: 3px;
            z-index: 1000;
        }

        .container {
            padding: 30px;
            max-width: 1200px;
            margin: auto;
        }

        .gallery {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }

        .gallery img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 8px;
            cursor: pointer;
            border: 4px solid #fff;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
            transition: transform 0.3s, border-color 0.3s;
        }

        .gallery img:hover {
            transform: scale(1.05);
            border-color: #fcb83a;
        }

        /* Lightbox */
        .lightbox {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.85);
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .lightbox img {
            max-width: 90%;
            max-height: 90%;
            border-radius: 8px;
            border: 5px solid #fcb83a;
        }

        .close {
            position: absolute;
            top: 20px;
            right: 30px;
            font-size: 36px;
            color: #fff;
            cursor: pointer;
            font-weight: bold;
        }

        .nav {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            font-size: 50px;
            color: #fff;
            cursor: pointer;
            padding: 10px;
            user-select: none;
        }

        .prev { left: 30px; }
        .next { right: 30px; }

        footer {
            margin-top: 40px;
            padding: 15px;
            text-align: center;
            background-color: #237A9B;
            color: white;
        }
    </style>