.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    background-color: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 0.375rem;
    color: #4b5563;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.tool-btn:hover {
    background-color: #e0e7ff;
    color: #4f46e5;
    border-color: #c7d2fe;
}

.tool-btn i {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

/* Canvas styling */
.canvas-container {
    background-image: 
        linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}