.about-container {
        display: flex;
        min-height: calc(100vh - 150px);
        background: #fff;
        border-radius: 8px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        margin: 20px 0;
    }
    .sidebar {
        width: 280px;
        background: #f8f9fa;
        border-right: 1px solid #dee2e6;
        padding: 15px 0;
        overflow-y: auto;
    }
    .tree {
        list-style: none;
        padding-left: 0;
    }
    .tree li {
        margin: 2px 0;
    }
    .tree li > div {
        padding: 8px 15px;
        cursor: pointer;
        font-size: 13px;
        display: flex;
        align-items: center;
        border-left: 3px solid transparent;
        transition: all 0.2s;
    }
    .tree li > div:hover {
        background: #e9ecef;
        border-left-color: #007bff;
    }
    .tree li > div.active {
        background: #e7f3ff;
        border-left-color: #007bff;
        font-weight: 500;
    }
    .tree .folder {
        font-weight: 500;
        color: #495057;
    }
    .tree .folder .icon {
        margin-right: 8px;
        font-size: 12px;
        width: 16px;
        display: inline-block;
    }
    .tree .page {
        padding-left: 35px;
        font-size: 12px;
        color: #0066cc;
    }
    .tree .page .icon {
        margin-right: 8px;
        width: 16px;
        display: inline-block;
        color: #6c757d;
    }
    .content-area {
        flex: 1;
        padding: 25px 30px;
        overflow-y: auto;
        background: #fff;
        font-size: 14px;
        line-height: 1.7;
    }
    .content-area h2 {
        font-size: 22px;
        margin-top: 0;
        margin-bottom: 20px;
        padding-bottom: 10px;
        border-bottom: 2px solid #2c5282;
        color: #2c5282;
    }
    .content-area h3 {
        font-size: 18px;
        margin: 25px 0 15px;
        color: #2c3e50;
    }
    .content-area h4 {
        font-size: 16px;
        margin: 20px 0 10px;
        color: #2c3e50;
    }
    .content-area p {
        margin: 10px 0;
        text-indent: 2em;
    }
    .content-area ul, .content-area ol {
        margin: 10px 0 10px 25px;
    }
    .content-area li {
        margin: 5px 0;
    }
    .content-area table {
        width: 100%;
        border-collapse: collapse;
        margin: 15px 0;
        font-size: 13px;
    }
    .content-area th {
        background: #f1f5f9;
        padding: 10px;
        border: 1px solid #dee2e6;
        font-weight: 600;
    }
    .content-area td {
        padding: 8px 10px;
        border: 1px solid #dee2e6;
    }
    .badge {
        display: inline-block;
        padding: 3px 7px;
        border-radius: 12px;
        font-size: 11px;
        font-weight: 500;
        margin: 0 2px;
    }
    .badge-green { background: #d4edda; color: #155724; }
    .badge-orange { background: #fff3cd; color: #856404; }
    .badge-red { background: #f8d7da; color: #721c24; }
    .badge-blue { background: #d1ecf1; color: #0c5460; }
    .badge-yellow { background: #fff3cd; color: #856404; }
    .field-desc {
        background: #f8f9fa;
        padding: 15px;
        border-left: 4px solid #007bff;
        margin: 15px 0;
        border-radius: 0 4px 4px 0;
    }
    .field-desc p {
        margin: 5px 0;
    }
    .note {
        background: #fff9e6;
        padding: 12px;
        border-left: 4px solid #ffc107;
        margin: 15px 0;
    }
    @media (max-width: 768px) {
        .about-container {
            flex-direction: column;
        }
        .sidebar {
            width: 100%;
            border-right: none;
            border-bottom: 1px solid #dee2e6;
        }
    }