@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&display=swap');
body {
    margin: 0;
    background-color: #fcfaf2;
    font-family: 'Noto Sans JP', 'Yu Gothic UI Semibold', 'Yu Gothic Medium', 'メイリオ', Meiryo, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 0;
    overflow-y: auto;
}
#container {
    display: flex;
    flex-direction: row;
    max-width: 860px;
    width: 90%;
    margin: 15px auto;
    justify-content: center;
    align-items: flex-start;
    padding: 15px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}
#navigation {
    width: 170px;
    margin-right: 30px;
    padding-top: 0;
}
.info-heading {
    font-size: 18px;
    font-weight: 700;
    color: #4a6fa5;
    text-align: center;
    margin: 0 0 15px 0;
    padding: 5px 0;
    border-bottom: 2px solid #c0ddee;
    display: block;
}
.news-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.news-list li {
    margin-bottom: 8px; /* 各項目間の余白 */
    font-size: 13px;
    line-height: 1.4;
}
.news-list .news-content {
    color: #555555; /* 本文に近いグレー */
}
#navigation ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
#navigation li {
    margin-bottom: 8px;
}
#navigation nav li a {
    display: block;
    padding: 8px 12px;
    background-color: #e6f0f5;
    color: #4a6fa5;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-size: 14px;
    font-weight: 500;
}
#navigation nav li a:hover {
    background-color: #c0ddee;
    color: #35508a;
}
#contents {
    flex-grow: 1;
    max-width: 580px;
    display: flex;
    flex-direction: column;
}
#content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 15px;
    margin-bottom: 30px;
}
#contents a {
    text-decoration: none;
}
.main-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    aspect-ratio: 1 / 1;
    background: #84b8e0;
    border-radius: 12px;
    text-align: center;
    font-size: 17px;
    font-weight: 700;
    color: #ffffff;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.07);
    transition: background 0.3s ease, transform 0.2s ease;
    overflow: hidden;
}
.main-btn:hover {
    background: #6a9acb;
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}
.main-btn img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 12px;
}
.main-btn.round-img {
    border-radius: 50%;
    background: #a8d6e0;
}
.main-btn.round-img:hover {
    background: #8ecbd4;
}
.main-btn.round-img img {
    border-radius: 50%;
}
.deco-shape {
    width: 100%;
    aspect-ratio: 1 / 1;
    background-color: #d1e2ed;
    border-radius: 50% 50% 50% 50% / 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}
.deco-shape.no-background {
    background-color: transparent;
    box-shadow: none;
    border-radius: 0;
}
.deco-shape.text-content {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 38px;
    font-weight: 700;
    color: #35508a;
    text-align: center;
    letter-spacing: 2px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}
.deco-shape.text-content p {
    margin: 0;
    line-height: 1.2;
}
.deco-shape img {
    max-width: 75%;
    max-height: 75%;
    object-fit: contain;
}
#content-footer {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}
.last-update {
    color: #757575;
    font-size: 12px;
    margin-bottom: 8px;
}
.footer-content {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}
.logo {
    width: 65px;
    height: auto;
    object-fit: contain;
}
.footer-text {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}
.description {
    line-height: 1.5;
    font-size: 13px;
    color: #555555;
    margin-bottom: 5px;
}
.copyright {
    font-size: 10px;
    color: #888888;
}
/* スマートフォン向けのスタイル (最大幅 768px で適用) */
@media screen and (max-width: 768px) {
    body {
        align-items: flex-start;
        padding-top: 10px;
    }
    #container {
        width: 95%;
        margin: 0 auto;
        padding: 10px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    }
    #navigation {
        width: 100%;
        margin-bottom: 15px;
        text
    }