/* ---------- ハンバーガーボタン ---------- */

.hamburger-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    background: transparent;
    cursor: pointer;
}

@media (min-width: 768px) {
    .hamburger-button {
        display: none; /* PC/タブレットは左サイドバー固定のため非表示 */
    }
}

/* ---------- オフキャンバスメニュー(<dialog>) ---------- */

.offcanvas-menu {
    position: fixed;
    top: 0;
    right: 0;
    margin: 0;
    height: 100%;
    max-height: 100%;
    width: 80%;
    max-width: 320px;
    border: none;
    padding: 1.5rem 1rem;
    background: #ffffff;
    transform: translateX(100%);
    transition: transform 250ms ease;
}

    .offcanvas-menu[open] {
        transform: translateX(0);
    }

    .offcanvas-menu::backdrop {
        background: rgba(0, 0, 0, 0.4);
    }

.offcanvas-menu__nav {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.offcanvas-menu__link {
    color: #1a1a1a;
    font-size: 1rem;
}

.offcanvas-menu__close {
    align-self: flex-end;
    border: none;
    background: transparent;
    font-size: 1.25rem;
    cursor: pointer;
}

/* ---------- 左サイドバー固定表示(PC/タブレット) ---------- */

.sidebar-nav__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-nav__link {
    display: block;
    padding: 0.375rem 0;
    color: #1a1a1a;
}

.sidebar-nav__link--current {
    color: var(--color-primary);
    font-weight: bold;
}

/* ---------- ページ内TOC(アコーディオン, <details>/<summary>) ---------- */

.toc {
    border: 1px solid var(--color-secondary);
    border-radius: 4px;
    padding: 0.5rem 1rem;
    margin-bottom: 1.5rem;
}

.toc__summary {
    cursor: pointer;
    font-weight: bold;
    list-style: none;
}

    .toc__summary::after {
        content: "\25BC"; /* ▼ */
        float: right;
    }

.toc[open] .toc__summary::after {
    content: "\25B2"; /* ▲ */
}

.toc__list {
    list-style: none;
    margin: 0.75rem 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toc__list--nested {
    margin: 0.5rem 0 0 1rem;
}

.toc__link {
    color: var(--color-primary);
}