.SideNav {
    display: grid;
    gap: 20px;
    padding: 0px 20px;
    
    .ButtonBox {
        display: grid;
        /* gap: 10px; */
        
        .Title {
            font-size: 0.8em;
            color: var(--SubText1);

            /* SubTitleが存在しない場合のスタイル */
            &:not(:has(+ .SubTitle)) {
                padding-bottom: 10px;
            }
        }

        .SubTitle {
            font-size: 1em;
            font-weight: 700;
            color: var(--MainText2);
            padding: 20px 0px 7px 0px;
        }
        
        .NavButton {
            display: grid;
            gap: 10px;
            grid-template-columns: 20px 1fr;
            align-items: center;

            padding: 10px 20px;
            background-color: transparent;
            color: var(--SubPrimaryColor);
            text-decoration: none;
            border-radius: 5px;
            transition: background-color 0.3s, color 0.3s;

            /* 下位カテゴリを表現 */
            &.SubButton {
                padding-left: 40px;
            }

            /* アイコンなしのボタン */
            &.CatButton {
                grid-template-columns: 1fr;
            }

            &.TopLevelCat {
                font-size: 1.1em;
                font-weight: 700;
            }

            .icon {
                font-size: 1.1em;
            }
            .Text {
                
            }
        }

        .NavButton:hover {
            background-color: rgba(0, 0, 0, 0.05);
            color: var(--PrimaryColor);
        }
    }
    
    /* 動的表示のコンテナ：内部要素が親のレイアウトに直接従うように */
    .DynamicButtonArea {
        display: contents;
    }

    .Divider {
        border: none;
        border-top: 1px solid #ccc;
        margin: 10px 0;
    }

    .YamatsuCategoryTree {
        display: grid;
    }

    .YamatsuCategoryTopList,
    .YamatsuCategoryMiddleList,
    .YamatsuCategorySmallList {
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .YamatsuCategoryTopList {
        display: grid;
        gap: 20px;
    }

    .YamatsuCategoryTopItem {
        display: grid;
        gap: 10px;
    }

    .YamatsuCategoryTopLink {
        text-decoration: none;
        color: var(--MainText1);
        font-size: 1.08rem;
        font-weight: 700;
        padding: 0 8px;
    }

    .YamatsuCategoryMiddleList {
        display: grid;
        gap: 4px;
    }

    .YamatsuCategoryMiddleItem {
        display: grid;
        gap: 6px;
    }

    .YamatsuCategoryMiddleToggleButton {
        display: grid;
        width: 100%;
        grid-template-columns: 1fr auto;
        align-items: center;
        gap: 10px;
        padding: 5px 8px;
        border: 0;
        background: transparent;
        text-align: left;
        cursor: pointer;
        color: var(--MainText2);
    }

    .YamatsuCategoryMiddleToggleButton i {
        transition: transform 0.2s;
        color: var(--SubText1);
    }

    .YamatsuCategoryMiddleToggleButton.IsExpanded i {
        transform: rotate(180deg);
    }

    .YamatsuCategoryMiddleName {
        font-size: 1.02rem;
    }

    .YamatsuCategoryMiddleLink {
        display: block;
        padding: 0 8px;
        text-decoration: none;
        color: var(--MainText2);
        font-size: 1.02rem;
        padding: 5px 8px;
    }

    .YamatsuCategorySmallList {
        display: grid;
        gap: 4px;
        padding-left: 20px;
    }

    .YamatsuCategorySmallLink {
        display: block;
        text-decoration: none;
        color: var(--SubText1);
        font-size: 0.98rem;
        padding: 5px 8px;
    }

    .YamatsuCategoryAllLink {
        color: #2f5ee2;
    }

    .YamatsuCategoryTopLink:hover,
    .YamatsuCategoryMiddleLink:hover,
    .YamatsuCategoryMiddleToggleButton:hover,
    .YamatsuCategorySmallLink:hover {
        color: var(--PrimaryColor);
    }
}

.SideNav.SideNav--panel {
    padding: 0;
    gap: 18px;
}

.SidePanelNavContainer {
    border-top: 1px solid var(--LineColor);
    padding-top: 12px;
}

.SideNav.SideNav--panel .ButtonBox .Title {
    padding: 0 8px 8px;
}

.SideNav.SideNav--panel .ButtonBox .NavButton {
    padding: 10px 8px;
}

@media screen and (max-width: 900px) {
    .SideNav {
        padding: 0 14px;
    }
}