@media (min-width: 1800px) {
    #simple-toc-container {
        position: fixed;
        top: 280px;
        width: 280px;
        max-height: 70vh;
        overflow-y: auto;
        background-color: #1a1a1a;
        border: 1px solid #333;
        border-radius: 8px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        z-index: 9999;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        display: block;
    }
}

@media (max-width: 1799px) {
    #simple-toc-container {
        display: none;
    }
}

.simple-toc-title {
    padding: 15px 20px 10px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    border-bottom: 1px solid #333;
    margin-bottom: 0;
}

.simple-toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.simple-toc-item {
    margin: 0;
    padding: 0;
    border-bottom: 1px solid #2a2a2a;
}

.simple-toc-item:last-child {
    border-bottom: none;
}

.simple-toc-link {
    display: block;
    padding: 10px 20px;
    color: #ccc;
    text-decoration: none;
    font-size: 13px;
    line-height: 1.4;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.simple-toc-link:hover {
    color: #fff;
    background-color: #2a2a2a;
    border-left-color: #555;
}

.simple-toc-link.active {
    color: #fff;
    background-color: #333;
    border-left-color: #007cba;
    font-weight: 500;
}

.simple-toc-level-1 .simple-toc-link,
.simple-toc-level-2 .simple-toc-link {
    padding-left: 20px;
    font-weight: 500;
}

.simple-toc-level-3 .simple-toc-link {
    padding-left: 35px;
    font-size: 12px;
    color: #aaa;
}

.simple-toc-level-3 .simple-toc-link:hover {
    color: #ddd;
}

.simple-toc-level-3 .simple-toc-link.active {
    color: #fff;
    border-left-color: #005a87;
}

#simple-toc-container::-webkit-scrollbar {
    width: 6px;
}

#simple-toc-container::-webkit-scrollbar-track {
    background: #1a1a1a;
}

#simple-toc-container::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 3px;
}

#simple-toc-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}

@media (min-width: 1800px) and (max-width: 2200px) {
    #simple-toc-container {
        width: 250px;
        font-size: 12px;
    }
    
    .simple-toc-title {
        font-size: 13px;
        padding: 12px 15px 8px;
    }
    
    .simple-toc-link {
        padding: 8px 15px;
        font-size: 12px;
    }
    
    .simple-toc-level-1 .simple-toc-link,
    .simple-toc-level-2 .simple-toc-link {
        padding-left: 15px;
    }
    
    .simple-toc-level-3 .simple-toc-link {
        padding-left: 25px;
        font-size: 11px;
    }
}