html { scroll-behavior: smooth; }
        
        body {
            font-family: system-ui, sans-serif;
            background: linear-gradient(to left, #ddd 0%, #bbb 100%);
            color: #333;
            margin: 0;
            padding: 2em;
            font-size: 0.77em;
            line-height: 1.6;
        }

        .container {
            max-width: 52em;
            margin: auto;
            padding: 2.5em;
            background: #fff;
            border-radius: 1em;
            box-shadow: 0 0 1em rgba(0, 0, 0, 0.5);
        }

        h2 {
            font-size: 1.4em;
            color: rgb(32, 39, 49);
            margin-top: 2em;
            margin-bottom: 0.5em;
            display: flex;
            align-items: center;
            gap: 0.5em; /* spacing between image and text */
        }

        h2 img {
            height: 1.4em; /* scale image to match text height */
            vertical-align: middle; /* fallback */
        }

        h2:first-of-type {
            margin-top: 0;
        }

        p {
            margin: 1em 0;
            font-size: 1.2em;
        }

        ul {
            padding-left: 1.5em;
            margin-top: 0.5em;
            margin-bottom: 1.5em;
        }

        li {
            margin-bottom: 0.5em;
        }

        hr {
            border: none;
            border-top: 1px solid #444;
            margin: 2em 0;
        }

        strong {
            color: #222;
        }

        .code-block {
            position: relative;
            margin-bottom: 2em;
        }

        .copy-btn,
        .download-btn {
            position: absolute;
            top: 8px;
            right: 8px;
            margin-left: 6px;
            padding: 0.4em 0.7em;
            font-size: 0.8em;
            cursor: pointer;
            border: none;
            border-radius: 4px;
            background: #44444477;
            color: #fff;
        }

        .copy-btn {
            right: 80px;
        }

        .copy-btn:hover,
        .download-btn:hover {
           background: #44444422;
           color:#777; 
        }

        pre { 
            border-radius:8px; 
            box-shadow:0 0 10px rgba(0,0,0,0.1);
            
        }


        #whatIsExplain, #whatIsNotExplain, #currentFsExplain, #futureFsExplain {
            display:block;           

        }

        #whatIsHeader, #whatIsNotHeader, #currentFsHeader, #futureFsHeader {
            padding: 0.4em;
            transition: all ease-in-out 0.8s;

        }

        #whatIsHeader:hover, #whatIsNotHeader:hover, #currentFsHeader:hover, #futureFsHeader:hover {
            background:#44444433;
            border-radius: 0.3em;
            cursor: pointer;           

        }

        @keyframes blink {
            50% {
                opacity: 0.0;
            }
        }

        .blink {
        animation: blink 1s step-start 0s infinite;
        }
        
        a {
            text-decoration: none;
            color:#222;
        }

        a:hover {
            cursor: pointer;
            color:#22222277;
        }

        /* Container holding image + title + link list */
        .overview-header {
            display: flex;
            align-items: flex-start;  /* top align both blocks */
            gap: 2em;
            margin: 2em 0;
        }

        /* Left column: logo */
        .overview-left .overview-logo {
            width: 25em;
            height: auto;
            display: block;
            margin: 0; /* no weird extra spacing */
        }

        /* Right column */
        .overview-right h2 {
            margin: 0 0 0.4em 0;
            padding: 0;
        }

        /* Link list */
        .overview-links {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .overview-links li {
            margin: 0.3em 0;
        }

        .overview-links a {
            text-decoration: none;
            color: #c0392b;            /* looks classy red, but pick your style */
            font-weight: 500;
        }

        .overview-links a:hover {
            text-decoration: underline;
        }

        @media (max-width: 720px) {
            .overview-header {
                flex-direction: column;
                align-items: center;     /* center both the image and the links */
                text-align: center;
            }

            .overview-left .overview-logo {
                width: 70%;              /* shrinks nicely for phones */
                max-width: 20em;
            }

            .overview-right {
                margin-top: 1em;
                text-align: left;
            }

            .overview-links li {
                margin: 0.5em 0;
            }
        }