body {
        margin: 0;
        padding: 0;
        background: linear-gradient(135deg, #0A1F44, #00008B);
        color: #E5E5EA;
        font-family: 'Roboto Mono', monospace;
        overflow-x: hidden;
    }
    header {
        position: fixed;
        top: 0;
        left: 200px;
        right: 0;
        padding: 20px;
        background: rgba(10, 31, 68, 0.8);
        z-index: 1000;
    }
    header h1 {
        margin: 0;
        font-size: 2em;
        text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
    }
    .navbar {
        position: fixed;
        top: 0;
        left: 0;
        width: 200px;
        height: 100vh;
        background-color: #0A1F44;
        padding-top: 60px;
        box-sizing: border-box;
        overflow-y: auto;
    }
    .navbar a {
        display: block;
        padding: 15px 20px;
        color: #E5E5EA;
        text-decoration: none;
        transition: background 0.3s;
    }
    .navbar a:hover {
        background-color: #9C27B0;
    }
    main {
        margin-left: 200px;
        padding: 80px 40px;
        max-width: 1200px;
        box-sizing: border-box;
    }
    .floating-card {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 15px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        padding: 20px;
        margin-bottom: 20px;
        transition: transform 0.3s ease-in-out;
    }
    .floating-card:hover {
        transform: scale(1.05) rotateY(5deg);
    }
    h2, h3 {
        text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    }
    pre {
        background: rgba(229, 229, 234, 0.2);
        padding: 15px;
        border-radius: 10px;
        overflow-x: auto;
    }
    code {
        color: #00FF7F;
    }
    .cube {
        position: relative;
        width: 100px;
        height: 100px;
        perspective: 1000px;
        margin: 20px auto;
    }
    .face {
        position: absolute;
        width: 100%;
        height: 100%;
        background-color: #E5E5EA;
        border: 1px solid #9C27B0;
        opacity: 0.8;
    }
    .cube div:nth-child(1) { transform: rotateX(90deg) translateZ(50px); }
    .cube div:nth-child(2) { transform: rotateX(-90deg) translateZ(50px); }
    .cube div:nth-child(3) { transform: rotateY(90deg) translateZ(50px); }
    .cube div:nth-child(4) { transform: rotateY(-90deg) translateZ(50px); }
    .cube div:nth-child(5) { transform: rotateY(0deg) translateZ(50px); }
    .cube div:nth-child(6) { transform: rotateY(180deg) translateZ(50px); }
    @keyframes spin {
        from { transform: rotateX(0deg) rotateY(0deg); }
        to { transform: rotateX(360deg) rotateY(360deg); }
    }
    .cube {
        animation: spin 10s infinite linear;
    }
    .button {
        background-color: #9C27B0;
        color: #fff;
        padding: 10px 20px;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: all 0.3s ease;
    }
    .button:hover {
        background-color: #00FF7F;
        transform: scale(1.1);
        box-shadow: 0 5px 10px rgba(0,0,0,0.3);
    }
    .sample-data img {
        width: 320px;
        height: 320px;
        object-fit: cover;
        margin: 10px;
    }
    .reference-note {
        text-align: center;
        margin: 20px 0;
        font-size: 1.2em;
        color: #00FF7F;
    }
    @media (max-width: 1440px) {
        main {
            padding: 80px 30px;
        }
    }
    @media (max-width: 1200px) {
        .navbar {
            width: 180px;
        }
        header {
            left: 180px;
        }
    }
    @media (max-width: 1024px) {
        main {
            padding: 80px 20px;
        }
    }
    @media (max-width: 768px) {
        .navbar {
            width: 160px;
        }
        header {
            left: 160px;
        }
        .sample-data img {
            width: 280px;
            height: 280px;
        }
    }
    @media (max-width: 480px) {
        .navbar {
            display: none;
        }
        header {
            left: 0;
        }
        main {
            margin-left: 0;
            padding: 80px 10px;
        }
        .sample-data img {
            width: 240px;
            height: 240px;
        }
    }
    @media (max-width: 320px) {
        .sample-data img {
            width: 200px;
            height: 200px;
        }
    }