:root {
            color-scheme: light dark;
            --background: #ffffff;
            --surface: #f2f2f2;
            --text-primary: #222222;
            --text-secondary: #666666;
            --border: #dddddd;
            --accent: #ff6b72;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: Arial, Helvetica, sans-serif;
            max-width: 900px;
            margin: auto;
            padding: 40px 20px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--background);
        }

        h1 {
            margin: 0 0 8px;
        }

        h2 {
            margin-top: 36px;
        }

        a {
            color: var(--accent);
        }

        .updated {
            margin-top: 0;
            color: var(--text-secondary);
            font-size: 14px;
        }

        .intro {
            margin: 24px 0 28px;
        }

        .notice {
            padding: 16px 18px;
            margin-bottom: 28px;
            border-left: 4px solid var(--accent);
            border-radius: 8px;
            background: var(--surface);
        }

        details {
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 14px 18px;
            margin-bottom: 12px;
            background: var(--background);
        }

        details[open] {
            background: var(--surface);
        }

        summary {
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
        }

        details p {
            margin: 12px 0 0;
        }

        details ul {
            margin: 12px 0 0;
            padding-left: 24px;
        }

        details li {
            margin-bottom: 8px;
        }

        footer {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 14px;
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --background: #0b2028;
                --surface: #142b34;
                --text-primary: #ffffff;
                --text-secondary: #b8c2c6;
                --border: #29424b;
            }
        }