.header-search {
    flex: 1;
    max-width: 500px;
    margin: 0 2rem;
}

.search-box {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.6rem 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.main {
    padding: 2rem 0;
}

.layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
}

.sidebar {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 90px;
}

.sidebar-title {
    font-size: 0.85rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
    font-weight: 600;
}

.category-list {
    list-style: none;
}

.category-item {
    margin-bottom: 0.5rem;
}

.category-link {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.7rem 1rem;
    color: #555;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.category-link:hover {
    background: #f8f9fa;
    color: #2563eb;
}

.category-link.active {
    background: #eff6ff;
    color: #2563eb;
    font-weight: 500;
}

.category-icon {
    font-size: 1.2rem;
}

.category-count {
    margin-left: auto;
    font-size: 0.8rem;
    color: #999;
    background: #f0f0f0;
    padding: 0.1rem 0.5rem;
    border-radius: 10px;
}

.tools-section {
    background: white;
    border-radius: 8px;
    padding: 2rem;
}

.section-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f0f0f0;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
}

.stats-bar {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.tool-card {
    display: block;
    background: #fafafa;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    padding: 1.2rem;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    border-color: #2563eb;
}

.tool-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
}

.tool-desc {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.5;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #999;
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }

    .header-search {
        margin: 0 1rem;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-wrap: wrap;
    }

    .header-search {
        order: 3;
        width: 100%;
        margin: 1rem 0 0 0;
    }
}