/* リセット＆基本設定 */
body, h1, h2, h3, p, ul, li {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    box-sizing: border-box;
}

body {
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

main {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 25px;
    border-radius: 8px;
}

h1 {
    font-size: 36px;
    color: #333;
    text-align: center;
    margin-bottom: 25px;
}

h3 {
    font-size: 22px;
    color: #444;
    margin: 15px 0;
}

ul {
    list-style-type: disc;
    padding-left: 20px;
    margin: 10px 0;
}

ul li {
    margin-bottom: 12px;
}

ul li a {
    text-decoration: none;
    font-weight: bold;
    color: #ff0000;
}

ul li a:hover {
    text-decoration: underline;
    color: #002fff;
}

.text {
    margin-top: 30px;
}

.text ul {
    margin-top: 15px;
}

.text ul li {
    margin-bottom: 15px;
}

.update_content {
    background-color: #eef2f7;
    padding: 20px;
    border-radius: 8px;
    margin-top: 40px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

.update_content span {
    font-weight: bold;
    font-size: 20px;
    display: block;
    margin-bottom: 15px;
}

.update_content ul {
    list-style-type: square;
    padding-left: 20px;
}

.update_content ul li {
    margin-bottom: 10px;
    font-size: 16px;
}

/* ログインリンクを中央に寄せるラッパー */
.login-wrapper {
    text-align: center;
    margin: 2rem 0;
}

/* ログインボタン強調用アニメーション */
@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 123, 255, 0.7);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 0 20px 10px rgba(0, 123, 255, 0);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 123, 255, 0);
    }
}

.invoice-login-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(45deg, #0062e6, #33aeff);
    color: #fff;
    font-weight: bold;
    border-radius: 8px;
    text-decoration: none;
    animation: pulse 2s ease-in-out infinite;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.invoice-login-button:hover {
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(0, 123, 255, 0.8);
}

/* メディアクエリー */
@media (max-width: 768px) {
    h1 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }

    main {
        padding: 20px;
    }

    ul li a {
        font-size: 16px;
    }

    .update_content {
        padding: 15px;
    }

    .update_content span {
        font-size: 18px;
    }

    .text ul li {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 22px;
    }

    h3 {
        font-size: 18px;
    }

    ul li a {
        font-size: 16px;
    }

    .update_content {
        padding: 12px;
    }

    .update_content span {
        font-size: 16px;
    }

    .text ul li {
        font-size: 14px;
    }
}