.three-d-container {
            margin: 30px auto;
            width: 300px;
            height: 300px;
            border-radius: 3px;
            position: relative;
            perspective: 1000px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2), 0 0 40px rgba(0, 0, 0, 0.2) inset;
        }
        
        .three-d-cube {
            width: 100%;
            height: 100%;
            position: absolute;
            transition: transform 1s ease-in-out;
            transform-style: preserve-3d;
            transform: translateZ(-150px);
            will-change: transform;
        }
        
        .three-d-cube .three-d-item {
            width: 100%;
            height: 100%;
            display: block;
            margin: 0;
            position: absolute;
            backface-visibility: hidden;
        }
        
        .three-d-cube .three-d-item img {
            width: 100%;
            height: 100%;
            display: block;
            margin: 0;
            object-fit: cover;
        }
        
        .three-d-item:nth-child(1) { transform: rotateY(0deg) translateZ(150px); }
        .three-d-item:nth-child(2) { transform: rotateX(180deg) translateZ(150px); }
        .three-d-item:nth-child(3) { transform: rotateY(90deg) translateZ(150px); }
        .three-d-item:nth-child(4) { transform: rotateY(-90deg) translateZ(150px); }
        .three-d-item:nth-child(5) { transform: rotateX(90deg) translateZ(150px); }
        .three-d-item:nth-child(6) { transform: rotateX(-90deg) translateZ(150px); }
        
        .a:checked ~ .three-d-cube { transform: translateZ(-150px) rotateY(0deg); }
        .b:checked ~ .three-d-cube { transform: translateZ(-150px) rotateX(-180deg); }
        .c:checked ~ .three-d-cube { transform: translateZ(-150px) rotateY(-90deg); }
        .d:checked ~ .three-d-cube { transform: translateZ(-150px) rotateY(90deg); }
        .e:checked ~ .three-d-cube { transform: translateZ(-150px) rotateX(-90deg); }
        .f:checked ~ .three-d-cube { transform: translateZ(-150px) rotateX(90deg); }
        
        .three-d-bullet {
            position: absolute;
            left: -9999px;
        }
        
        /* Navigation indicators */
        .cube-nav {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 20px;
        }
        
        .nav-dot {
            width: 24px;
            height: 24px;
            cursor: pointer;
            transition: all 0.3s ease;
            background: transparent;
            position: relative;
            border: none;
            font-size: 24px;
        }
        
        .nav-dot::after {
            content: "☆";
            position: absolute;
            top: 0;
            left: 0;
        }
        
        .nav-dot.active::after {
            content: "★";
            color: gold;
            text-shadow: 0 0 5px gold;
        }
        
        /* Alternative window icons */
        .window-icon::after {
            content: "▥";
            color:#fff;
        }
        
        .window-icon.active::after {
            content: "▥";
            color: #106faf;
            text-shadow: 0 0 5px #106faf;
        }
        
        .scroll-content {
            height: 2000px;
            padding-top: 400px;
            text-align: center;
        }
        
        .instructions {
            margin-top: 30px;
            text-align: center;
            color: #666;
            font-size: 8px;
        }