/* ========================================
   サイドメニュー - Side Menu
======================================== */

.side-menu {
    position: fixed;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
    --line-position: 3px;
}

/* スクロール時に表示 */
.side-menu.is-visible {
    opacity: 1;
    visibility: visible;
}

/* 縦線（画面フル高さ） */
.side-menu::before {
    content: '';
    position: fixed;
    top: 0;
    left: var(--line-position);
    width: 0.3px;
    height: 100vh;
    background-color: #dfdfdf;
    z-index: 99;
	left: 3px;
}

/* ナビゲーション */
.side-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
    z-index: 100;
}

/* メニューアイテム */
.side-nav-item {
    position: relative;
    margin: 0;
    padding: 0;
}

/* メニューリンク */
.side-nav-link {
    display: block;
    padding: 8px 34px 8px 16px;
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    font-size: 13px;
    letter-spacing: 0.05em;
    color: #7a7a7a;
    text-decoration: none;
    position: relative;
    background-color: transparent;
    transition: all 0.3s ease;
}

/* アイコン（■）をpseudo要素で作成 */
.side-nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background-color: #d0d0d0;
    transition: background-color 0.3s ease;
    z-index: 1;
}

/* ホバー時のスタイル */
.side-nav-link:hover {
    color: #e60012;
}

.side-nav-link:hover::before {
    background-color: #e60012;
}

/* アクティブ状態（現在のページ） */
.side-nav-item.is-active .side-nav-link {
    color: #e60012;
}

.side-nav-item.is-active .side-nav-link::before {
    background-color: #e60012;
}

/* レスポンシブ対応 - 1800px未満では非表示 */
@media screen and (max-width: 1799px) {
    .side-menu {
        display: none;
    }
}