/* ============================================================
 * 目次(TOC)オーバーレイ（toc-overlay.js 用）
 * フローティングアイコン＋全画面オーバーレイ型UI。
 * PC/スマホ共通、レスポンシブ分岐なし。
 * ============================================================ */

/* ── フローティングアイコン ──────────────────────── */
.toc-overlay-trigger {
    position: fixed;
    min-width: 56px;
    width: auto;
    height: 56px;
    border-radius: 28px;
    background: rgb(128, 128, 128);
    color: #fff;
    font-family: "Iosevka Charon", monospace;
    font-weight: 500;
    font-style: normal;
    font-size: 14px;
    opacity: 0.3;
    line-height: 56px;
    text-align: center;
    white-space: nowrap;
    padding: 0 14px;
    border: none;
    z-index: 9998;
    user-select: none;
    touch-action: none;
    cursor: grab;
    transition: opacity 0.2s;
    /* スクロール中もAndroid Chromium系でズレないようGPU合成レイヤーに昇格 */
    transform: translateZ(0);
    will-change: transform;
}

.toc-overlay-trigger:hover {
    opacity: 0.6
}

/* ── オーバーレイ背景 ────────────────────────────── */
.toc-overlay-backdrop {
    box-sizing: border-box;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    overflow-x: hidden;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.toc-overlay-backdrop.is-open {
    visibility: visible;
    opacity: 1;
}

/* ── パネル(閉じるボタン+目次リストの幅をコンテンツ幅に揃える箱) ── */
.toc-overlay-panel {
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    width: 90%;
    max-width: 600px;
    min-height: 0;
    max-height: 100%;
}

/* ── 閉じるボタン ────────────────────────────────── */
.toc-overlay-close-row {
    display: flex;
    justify-content: flex-end;
    flex: none;
}

.toc-overlay-close {
    position: static;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #aaa;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
}

.toc-overlay-close:hover {
    color: #fff;
}

/* ── 目次リスト ──────────────────────────────────── */
.toc-overlay-list-wrap {
    flex: 1 1 auto;
    overflow-y: auto;
    width: 100%;
    /* flexアイテムのデフォルトmin-width:autoによる横溢れ(長い見出し文字列)を防ぐ */
    min-width: 0;
    min-height: 0;
}

.toc-overlay-list-wrap::-webkit-scrollbar {
    width: 6px;
}

.toc-overlay-list-wrap::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
}

.toc-overlay-list,
.toc-overlay-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-overlay-list a {
    color: #ddd;
    text-decoration: none;
    display: block;
    padding: 0.4rem 0;
    overflow-wrap: break-word;
    word-break: break-word;
}

.toc-overlay-list a:hover {
    color: #fff;
    text-decoration: underline;
}

/* ── トップページへのリンク(リスト最上部) ────────── */
.toc-overlay-top-link {
    display: block;
    color: #ddd;
    text-decoration: none;
    font-weight: bold;
    padding: 0.4rem 0 0.8rem;
    margin-bottom: 0.4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.toc-overlay-top-link:hover {
    color: #fff;
    text-decoration: underline;
}

.toc-overlay-list a[data-level="1"] {
    padding-left: 0;
}

.toc-overlay-list a[data-level="2"] {
    padding-left: 1rem;
}

.toc-overlay-list a[data-level="3"] {
    padding-left: 2rem;
}

.toc-overlay-list a[data-level="4"] {
    padding-left: 3rem;
}

.toc-overlay-list a[data-level="5"] {
    padding-left: 4rem;
}