/* ---------- ベース ---------- */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', 'Noto Sans JP', sans-serif;
            background-color: #e1f5fe;
            color: #2c2c2c;
            line-height: 1.8;
            padding-bottom: 4rem;
            position: relative;
            overflow-x: hidden;
            animation: gradient-shift 10s ease infinite;
            background: linear-gradient(-45deg, #b3e5fc, #81d4fa, #4fc3f7, #29b6f6);
            background-size: 400% 400%;
        }

        a {
            color: #0277bd;
            text-decoration: none;
            transition: 0.2s;
        }

        a:hover {
            color: #01579b;
        }

        header {
            background-color: #b3e5fc;
            padding: 1.5rem 2rem;
            border-bottom: 2px solid #81d4fa;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
        }

        header h1 {
            font-size: 1.8rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: #01579b;
        }

        .header-icon {
            width: 32px;
            height: 32px;
        }

        nav {
            margin-top: 0.5rem;
            font-size: 1rem;
            display: flex;
            flex-wrap: wrap;
        }

        nav a {
            margin-right: 1rem;
            font-weight: 500;
            opacity: 0.9;
        }

        main {
            max-width: 800px;
            margin: 2.5rem auto;
            background-color: #fff;
            padding: 2rem;
            border-radius: 16px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            animation: crt-glow 3s infinite ease-in-out;
        }

        .about-screenshot-wrap {
            text-align: center;
            margin-bottom: 2rem;
        }

        .about-screenshot {
            max-width: 100%;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            image-rendering: pixelated;
            animation: blink-border 1s infinite alternate;
        }

        h2 {
            font-size: 1.6rem;
            margin-bottom: 1rem;
            border-left: 6px solid #81d4fa;
            padding-left: 0.75rem;
            color: #01579b;
        }

        h3 {
            font-size: 1.3rem;
            margin-top: 2rem;
            margin-bottom: 0.5rem;
            color: #0277bd;
        }

        ul {
            padding-left: 1.5rem;
            margin-bottom: 1.5rem;
            list-style-type: disc;
        }

        li {
            margin-bottom: 0.5rem;
        }

        footer {
            text-align: center;
            font-size: 0.85rem;
            color: #666;
            margin-top: 3rem;
            padding: 2rem 1rem;
            border-top: 1px solid #b3e5fc;
            background-color: #e0f7fa;
        }

        @media (max-width: 600px) {
            header h1 {
                font-size: 1.4rem;
                flex-direction: column;
                align-items: flex-start;
            }

            nav a {
                display: block;
                margin-bottom: 0.5rem;
            }

            main {
                padding: 1.5rem 1rem;
            }
        }

        @keyframes blink-border {
            0% {
                border: 2px solid #81d4fa;
            }

            100% {
                border: 2px solid #0288d1;
            }
        }

        @keyframes crt-glow {

            0%,
            100% {
                box-shadow: 0 0 2px rgba(0, 255, 255, 0.15), 0 0 8px rgba(0, 255, 255, 0.05);
            }

            50% {
                box-shadow: 0 0 6px rgba(0, 255, 255, 0.25), 0 0 12px rgba(0, 255, 255, 0.1);
            }
        }

        @keyframes gradient-shift {
            0% {
                background-position: 0% 50%;
            }

            50% {
                background-position: 100% 50%;
            }

            100% {
                background-position: 0% 50%;
            }
        }

        /* ---------- ドットネズミ散りばめる ---------- */
        .nezumi-decoration {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
        }

        .nezumi {
            width: 32px;
            height: 32px;
            position: absolute;
            image-rendering: pixelated;
            animation: scatter-hop 2s infinite ease-in-out;
        }

        .terms-link {
            display: inline-block;
            padding: 10px 20px;
            background-color: #4a90e2;
            /* ネズミカラーっぽい青チュー */
            color: white;
            text-decoration: none;
            border-radius: 6px;
            font-weight: bold;
            font-family: 'Inter', sans-serif;
            transition: background-color 0.3s ease;
            cursor: pointer;
        }

        .terms-link:hover {
            background-color: #357abd;
            /* ホバー時は少し濃い青チュー */
        }

        /* 角度ランダム＋位置指定（手動配置） */
        .scatter:nth-child(1) {
            top: 5%;
            left: 10%;
            transform: rotate(0deg);
        }

        .scatter:nth-child(2) {
            top: 20%;
            right: 15%;
            transform: rotate(45deg);
        }

        .scatter:nth-child(3) {
            bottom: 10%;
            left: 5%;
            transform: rotate(90deg);
        }

        .scatter:nth-child(4) {
            bottom: 25%;
            right: 20%;
            transform: rotate(135deg);
        }

        .scatter:nth-child(5) {
            top: 50%;
            left: 45%;
            transform: rotate(270deg);
        }

        @keyframes scatter-hop {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-4px);
            }
        }