* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    background: #f5f7fa;
    color: #2d3748;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #1a202c;
    font-size: 2.5rem;
}

.search-container {
    margin-bottom: 2rem;
}

#searchInput {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    transition: all 0.3s ease;
}

#searchInput:focus {
    outline: none;
    border-color: #4299e1;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}

/* Masonry Grid Layout */
.categories {
    column-count: 4;
    column-gap: 1rem;
    padding: 1rem;
}

.category {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
    display: inline-block;
    width: 100%;
    margin-bottom: 2rem;
    break-inside: avoid; /* Prevent items from breaking into new columns */
}

.category:hover {
    transform: translateY(-4px);
}

.category h2 {
    color: #2b6cb0;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.tools-list {
    list-style: none;
    padding-left: 0;
}

.tools-list li {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e2e8f0;
}

.tools-list li:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.tool-link {
    display: block;
    padding: 0.5rem 0;
    color: #4a5568;
    text-decoration: none;
    transition: color 0.2s ease;
    font-weight: 600;
}

.tool-link:hover {
    color: #2b6cb0;
}

.tool-description {
    font-size: 0.9rem;
    color: #718096;
    margin-top: 0.25rem;
    line-height: 1.4;
}

/* Responsive */
@media (max-width: 1024px) {
    .categories {
        column-count: 2;
    }
}

@media (max-width: 768px) {
    .categories {
        column-count: 1;
    }
}