#main-content {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    line-height: 1.6;
    max-width: 800px;
    padding: 20px;
    background-color: #ffffff;
    color: #333333;
    margin: 0 auto;
}

.announcement {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 30px;
    margin-top: 85px;
    margin-bottom: 20px;
}

h1 {
    color: #0db9fc;
    font-size: 25px;
    font-weight: bold;
    margin-top: 20px;
    margin-bottom: 20px;
    border-bottom: 2px solid #0db9fc;
    padding-bottom: 10px;
}

.service-links {
    margin: 20px 0;
    padding-top: 5px;
    padding-left: 20px;
    padding-right: 20px;
    padding-bottom: 5px;
    background-color: #ffffff;
    border: 1px solid #dee2e6;
    border-radius: 6px;
}

.service-links h2 {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #495057;
}

.link-button-gigazo, .link-button-ausp {
    display: block;
    background-color: #0db9fc;
    color: #ffffff;
    text-decoration: none;
    padding: 16px 24px;
    margin: 25px 0;
    border-radius: 6px;
    font-weight: bold;
    transition: background-color 0.3s ease;
    border: 2px solid #0db9fc;
    text-align: center;
    min-height: 44px;
    box-sizing: border-box;
}

/* ギガぞうボタン */
.link-button-gigazo {
    background-color: #00aeff;
    border-color: #00aeff;
    transition: all 0.3s ease;
}

.link-button-gigazo:hover, 
.link-button-gigazo:focus {
    background-color: #0099d6;  /* 約15%暗く */
    border-color: #0099d6;
    box-shadow: 0 2px 8px rgba(13, 185, 252, 0.3);
    color: #ffffff !important;  /* 白文字を強制 */
}

/* au Wi-Fiボタン */
.link-button-ausp {
    background-color: #eb5505;
    border-color: #eb5505;
    transition: all 0.3s ease;
}

.link-button-ausp:hover, 
.link-button-ausp:focus {
    background-color: #c94804;  /* 15%暗く調整 */
    border-color: #c94804;
    box-shadow: 0 2px 8px rgba(235, 85, 5, 0.3);
    color: #ffffff !important;
}

.bookmark-notice {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 6px;
    padding: 15px;
    margin-top: 20px;
}

.bookmark-notice strong {
    color: #856404;
}

.bookmark-description {
    font-weight: bold;
    color: #dc3545;
}

@media (max-width: 600px) {
    body {
        padding: 15px;
    }

    h1 {
        font-size: 18px;
    }

    .service-links h2 {
        font-size: 15px;
    }
    
    .announcement {
        padding: 20px;
    }
    
    .link-button {
        display: block;
        margin: 8px 0;
        text-align: center;
    }
}