.filter-page {
        max-width: 1400px;
        margin: 24px auto;
        padding: 0 24px;
        display: flex;
        gap: 24px;
        align-items: flex-start;
    }
    .filter-sidebar {
        width: 240px;
        flex-shrink: 0;
        background: #fff;
        border-radius: 14px;
        border: 1px solid #e8ecf1;
        box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        position: sticky;
        top: 100px;
        overflow: hidden;
    }
    .filter-sidebar-inner {
        max-height: calc(100vh - 120px);
        overflow-y: auto;
    }
    .filter-sidebar-header {
        padding: 18px 20px 12px;
        font-size: 16px;
        font-weight: 700;
        color: #212121;
        border-bottom: 1px solid #eef0f4;
    }
    .filter-cat-list {
        list-style: none;
        margin: 0;
        padding: 8px 0;
    }
    .filter-cat-list li { margin: 0; }
    .filter-cat-item {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 9px 20px;
        cursor: pointer;
        font-size: 14px;
        color: #444;
        transition: 0.2s;
        text-decoration: none;
        border-left: 3px solid transparent;
    }
    .filter-cat-parent {
        border-left: 3px solid transparent;
    }
    .filter-cat-parent.active {
        border-left-color: var(--primary);
    }
    .filter-cat-parent .filter-cat-item {
        border-left: none;
        font-weight: bold;
        font-size: 15px;
    }
    .filter-cat-item:hover {
        background: #f5f7fa;
        color: var(--primary);
    }
    .filter-cat-item.active {
        background: var(--primary-light);
        color: var(--primary);
        font-weight: 600;
    }
    .filter-cat-item .cat-arrow {
        font-size: 10px;
        width: 14px;
        flex-shrink: 0;
        text-align: center;
        color: #999;
        transition: transform 0.2s;
    }
    .filter-cat-item .cat-arrow.open {
        transform: rotate(90deg);
    }
    .filter-cat-name {
        flex: 1;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .filter-sub-list {
        list-style: none;
        margin: 0;
        padding: 0;
        background: #fafbfc;
        overflow: hidden;
        max-height: 0;
        transition: max-height 0.3s ease;
    }
    .filter-sub-list.open { max-height: 1000px; }
    .filter-sub-list .filter-cat-item { padding-left: 42px; font-size: 13px; }
    .filter-sub-list .filter-sub-list .filter-cat-item { padding-left: 60px; font-size: 12px; }
    .filter-content {
        flex: 1;
        min-width: 0;
    }
    .filter-content-header {
        margin-bottom: 20px;
        padding: 16px 20px;
        background: #fff;
        border-radius: 14px;
        border: 1px solid #e8ecf1;
    }
    .filter-content-header .cat-header {
        margin-bottom: 0;
    }
    .filter-content-header .category-section-title {
        font-size: 22px;
        font-weight: 700;
        color: #212121;
        margin: 0;
        border-left: none;
        padding-left: 0;
    }
    .filter-content-header .filter-count {
        font-size: 14px;
        color: #999;
        flex-shrink: 0;
    }
    .filter-chips {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 12px;
        padding-top: 12px;
        border-top: 1px solid #eef0f4;
    }
    .filter-chip {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        padding: 6px 14px;
        border-radius: 20px;
        font-size: 13px;
        color: #555;
        background: #f5f7fa;
        text-decoration: none;
        transition: 0.2s;
        border: 1px solid transparent;
        cursor: pointer;
    }
    .filter-chip:hover {
        background: #e8ecf1;
        color: #333;
    }
    .filter-chip.active {
        background: var(--primary-light);
        color: var(--primary);
        font-weight: 600;
        border-color: var(--primary);
    }
    .filter-chip .chip-icon {
        font-size: 12px;
    }
    .filter-software-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    .filter-empty {
        text-align: center;
        padding: 80px 20px;
        color: #999;
        font-size: 15px;
        background: #fff;
        border-radius: 14px;
        border: 1px solid #e8ecf1;
    }
    .load-more-btn {
        display: inline-block;
        padding: 12px 48px;
        background: linear-gradient(135deg, #67c7fc, #00a4ff);
        border: none;
        border-radius: 30px;
        color: #fff;
        font-size: 15px;
        font-weight: 500;
        text-decoration: none;
        cursor: pointer;
        transition: 0.25s;
        box-shadow: 0 4px 14px rgba(0,164,255,0.3);
    }
    .load-more-btn:hover {
        background: linear-gradient(135deg, #4db5ef, #008fe0);
        box-shadow: 0 6px 20px rgba(0,164,255,0.45);
        transform: translateY(-1px);
        color: #fff;
    }
    @media (max-width: 1200px) {
        .filter-software-grid { grid-template-columns: repeat(2, 1fr); }
    }
    /* 手机端横向分类导航 */
    .mobile-cat-nav {
        display: none;
        background: #fff;
        border-radius: 14px;
        border: 1px solid #e8ecf1;
        padding: 12px 16px;
        margin-bottom: 16px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .mobile-cat-row {
        display: flex;
        align-items: flex-start;
        gap: 8px;
        padding: 6px 0;
        white-space: nowrap;
    }
    .mobile-cat-row + .mobile-cat-row {
        border-top: 1px solid #f0f0f0;
    }
    .mobile-cat-parent {
        flex-shrink: 0;
        font-weight: 700;
        font-size: 14px;
        color: #212121;
        text-decoration: none;
        padding: 4px 8px;
        border-radius: 6px;
        background: #f5f7fa;
        min-width: 72px;
        text-align: center;
    }
    .mobile-cat-parent.active,
    .mobile-cat-parent:hover {
        background: var(--primary-light);
        color: var(--primary);
    }
    .mobile-cat-children {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
        padding-bottom: 2px;
    }
    .mobile-cat-child {
        flex-shrink: 0;
        font-size: 12px;
        color: #666;
        text-decoration: none;
        padding: 4px 10px;
        border-radius: 14px;
        background: #f8f9fb;
        border: 1px solid #eee;
    }
    .mobile-cat-child.active,
    .mobile-cat-child:hover {
        background: var(--primary-light);
        color: var(--primary);
        border-color: var(--primary);
    }
    @media (max-width: 900px) {
        .filter-page { flex-direction: column; }
        .filter-sidebar { display: none; }
        .mobile-cat-nav { display: block; }
        .filter-software-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 480px) {
        .filter-software-grid { grid-template-columns: 1fr; }
    }