/* 文件分类区块 */
        .files-section {
            background: var(--white);
            border-radius: var(--radius-lg);
            margin: 48px 0;
            padding: 42px 48px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--slate-100);
        }
        .category-title {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 28px;
            border-left: 5px solid var(--blue);
            padding-left: 20px;
        }
        .category-title i {
            font-size: 28px;
            color: var(--blue);
        }
        .category-title h2 {
            font-size: 24px;
            font-weight: 800;
            color: var(--slate-800);
        }
        .file-list {
            list-style: none;
        }
        .file-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 18px 16px;
            border-bottom: 1px solid var(--slate-100);
            transition: background 0.2s;
            border-radius: var(--radius-sm);
            gap: 12px;
        }
        .file-item:hover {
            background: var(--slate-50);
        }
        .file-info {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            flex: 3;
            min-width: 200px;
        }
        .file-icon {
            font-size: 28px;
            color: var(--blue);
            width: 40px;
            text-align: center;
        }
        .file-details {
            flex: 1;
        }
        .file-name {
            font-size: 16px;
            font-weight: 700;
            color: var(--slate-800);
            margin-bottom: 6px;
            word-break: break-word;
        }
        .file-meta {
            font-size: 12px;
            color: var(--slate-500);
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        .file-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .file-actions {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .btn-download {
            background: var(--blue-light);
            color: var(--blue-dark);
            border: none;
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-download:hover {
            background: var(--blue);
            color: white;
            transform: translateY(-2px);
        }
        .btn-preview {
            background: transparent;
            border: 1px solid var(--slate-200);
            padding: 7px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            transition: 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .btn-preview:hover {
            background: var(--slate-100);
            border-color: var(--blue);
            color: var(--blue);
        }
        
        /* 响应式 */
        @media (max-width: 860px) {
            
            .dropdown-menu {
                position: static; opacity: 0; visibility: hidden; max-height: 0;
                overflow: hidden; transition: max-height 0.3s;
            }
            .dropdown-menu.show { opacity: 1; visibility: visible; max-height: 200px; margin: 6px 0; }
            .files-section { padding: 28px 24px; }
            .file-item { flex-direction: column; align-items: flex-start; }
            .file-actions { align-self: flex-end; }
        }
        @media (max-width: 640px) {
            .page-banner h1 { font-size: 28px; }
            .category-title h2 { font-size: 20px; }
            .file-info { gap: 10px; }
            .btn-download, .btn-preview { padding: 6px 12px; font-size: 12px; }
        }