.cushed-toc {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    margin: 20px 0 30px 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.cushed-toc-title {
    background: #007cba;
    color: #fff;
    padding: 12px 20px;
    font-weight: 600;
    font-size: 16px;
    margin: 0;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color 0.2s;
}

.cushed-toc-title:hover {
    background: #005a87;
}

.cushed-toc-title::after {
    content: "▼";
    font-size: 12px;
    transition: transform 0.2s;
}

.cushed-toc.collapsed .cushed-toc-title::after {
    transform: rotate(-90deg);
}

.cushed-toc-content {
    padding: 0;
    transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
    overflow: hidden;
}

.cushed-toc.collapsed .cushed-toc-content {
    max-height: 0;
    opacity: 0;
    padding: 0;
}

.cushed-toc-list {
    list-style: none;
    margin: 0;
    padding: 15px 20px;
    counter-reset: h2-counter h3-counter h4-counter h5-counter h6-counter;
}

.cushed-toc-item {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
}

.cushed-toc-link {
    display: block;
    text-decoration: none;
    color: #333;
    padding: 8px 0 8px 20px;
    border-radius: 4px;
    transition: all 0.2s;
    position: relative;
    line-height: 1.4;
}

.cushed-toc-link:hover {
    background: #e3f2fd;
    color: #1976d2;
    text-decoration: none;
}

.cushed-toc-link:focus {
    outline: 2px solid #007cba;
    outline-offset: 2px;
}

/* レベル別のスタイリング */
.cushed-toc-level-2 {
    counter-increment: h2-counter;
}

.cushed-toc-level-2 .cushed-toc-link {
    font-weight: 600;
    color: #2c3e50;
    padding-left: 20px;
}

.cushed-toc-level-2 .cushed-toc-link::before {
    content: counter(h2-counter) ".";
    position: absolute;
    left: 0;
    font-weight: 600;
    color: #007cba;
}

.cushed-toc-level-3 {
    counter-increment: h3-counter;
}

.cushed-toc-level-3 .cushed-toc-link {
    font-weight: 500;
    color: #34495e;
    padding-left: 40px;
    font-size: 14px;
}

.cushed-toc-level-3 .cushed-toc-link::before {
    content: "•";
    position: absolute;
    left: 20px;
    color: #00a32a;
}

.cushed-toc-level-4 {
    counter-increment: h4-counter;
}

.cushed-toc-level-4 .cushed-toc-link {
    color: #5a6c7d;
    padding-left: 60px;
    font-size: 13px;
}

.cushed-toc-level-4 .cushed-toc-link::before {
    content: "◦";
    position: absolute;
    left: 40px;
    color: #ff6900;
}

.cushed-toc-level-5 {
    counter-increment: h5-counter;
}

.cushed-toc-level-5 .cushed-toc-link {
    color: #6c757d;
    padding-left: 80px;
    font-size: 13px;
}

.cushed-toc-level-5 .cushed-toc-link::before {
    content: "▪";
    position: absolute;
    left: 60px;
    color: #8f00ff;
}

.cushed-toc-level-6 {
    counter-increment: h6-counter;
}

.cushed-toc-level-6 .cushed-toc-link {
    color: #6c757d;
    padding-left: 100px;
    font-size: 12px;
}

.cushed-toc-level-6 .cushed-toc-link::before {
    content: "▫";
    position: absolute;
    left: 80px;
    color: #ff0080;
}

/* アクティブリンクのスタイル */
.cushed-toc-link.active {
    /* background: #e3f2fd;
    color: #1976d2; */
}

/* スムーズスクロール - JavaScript制御のため無効化（競合回避） */
html {
    scroll-behavior: auto;
}

/* 目次リンクの即座の反応 */
.cushed-toc-link:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
}


/* レスポンシブ対応 */
@media (max-width: 768px) {
    .cushed-toc {
        margin: 15px 0 20px 0;
    }
    
    .cushed-toc-title {
        padding: 10px 15px;
        font-size: 15px;
    }
    
    .cushed-toc-list {
        padding: 10px 15px;
    }
    
    .cushed-toc-level-3 .cushed-toc-link {
        padding-left: 30px;
    }
    
    .cushed-toc-level-4 .cushed-toc-link {
        padding-left: 40px;
    }
    
    .cushed-toc-level-5 .cushed-toc-link {
        padding-left: 50px;
    }
    
    .cushed-toc-level-6 .cushed-toc-link {
        padding-left: 60px;
    }
    
    .cushed-toc-level-3 .cushed-toc-link::before {
        left: 15px;
    }
    
    .cushed-toc-level-4 .cushed-toc-link::before {
        left: 25px;
    }
    
    .cushed-toc-level-5 .cushed-toc-link::before {
        left: 35px;
    }
    
    .cushed-toc-level-6 .cushed-toc-link::before {
        left: 45px;
    }
}

@media (max-width: 480px) {
    .cushed-toc-title {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .cushed-toc-list {
        padding: 8px 12px;
    }
    
    .cushed-toc-link {
        padding: 6px 0 6px 15px;
        font-size: 13px;
    }
    
    .cushed-toc-level-2 .cushed-toc-link {
        padding-left: 15px;
    }
    
    .cushed-toc-level-3 .cushed-toc-link {
        padding-left: 25px;
        font-size: 12px;
    }
    
    .cushed-toc-level-4 .cushed-toc-link {
        padding-left: 35px;
        font-size: 12px;
    }
    
    .cushed-toc-level-5 .cushed-toc-link,
    .cushed-toc-level-6 .cushed-toc-link {
        display: none; /* 小さい画面では深い階層は非表示 */
    }
}