:root {
            --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            --space: 1.6rem;

            --bg: #ffffff;
            --fg: #222222;
            --subtle: #666666;
            --border: #e0e0e0;
            --btn: #666;
            --txtbtn: #f0f0f0;
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --bg: #111111;
                --fg: #f0f0f0;
                --subtle: #bbbbbb;
                --border: #333333;
                --btn: #e0e0e0;
                --txtbtn: #222;
            }
        }

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font);
            background: var(--bg);
            color: var(--fg);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        header {
            padding: 1rem var(--space);
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        header h1 {
            margin: 0;
            font-size: 1.25rem;
            font-weight: 600;
        }

        header div a {
            background: var(--btn);
            color: var(--txtbtn);
            text-decoration: none;
            padding: 6px 20px 8px 20px;
            border-radius: 20px;
        }

        header div a:hover {
            background: var(--txtbtn);
            color: var(--btn);
            text-decoration: none;
            padding: 8px 20px;
            border-radius: 20px;
        }

        main {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: var(--space);
            max-width: 600px;
            margin: auto;
        }

        main h2 {
            margin: 0 0 1rem 0;
            font-size: 1.5rem;
            font-weight: 600;
        }

        main p {
            margin: 0 0 1.2rem 0;
            line-height: 1.6;
            color: var(--subtle);
        }

        main img {
            max-width: 150px;
        }

        main a:link, main a:visited {
            color: var(--subtle);
        }

        main a:hover {
            color: var(--fg);
            text-decoration: none;
        }

        footer {
            padding: var(--space);
            text-align: center;
            border-top: 1px solid var(--border);
        }

        footer a {
            color: var(--fg);
            text-decoration: none;
            font-weight: 600;
        }

        footer a:hover {
            text-decoration: underline;
        }

        footer section {
            max-width: 50px;
            margin: auto;
            display: grid;
            grid-template-columns: 5% 95%;
        }

        footer section div:first-child {
            -moz-transform: scale(-1, 1);
            -o-transform: scale(-1, 1);
            -ms-transform: scale(-1, 1);
            transform: scale(-1, 1);
        }