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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(45deg, rgba(180, 230, 255, 0.8), rgba(255, 255, 255, 0.8));
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    position: relative;
}

.canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: white;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.1);
}

canvas {
    width: 100%;
    height: 100%;
    background-color: white;
    cursor: crosshair;
}

.tools {
    position: fixed;
    display: flex;
    justify-content: center;
    gap: 15px;
    transition: opacity 0.3s ease-in-out;
    z-index: 10;
}

.tools button,
.tools div {
    background-color: #f3f3f3;
    border: none;
    padding: 12px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    background-color: #f3f3f3;
}

#color-picker-button:hover {
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.5), rgba(255, 0, 255, 0.5));
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

#brush-size-container:hover {
    background: linear-gradient(135deg, rgba(255, 255, 0, 0.5), rgba(0, 255, 0, 0.5));
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

#eraserTool:hover {
    background: linear-gradient(135deg, rgba(25, 25, 25, 0.5), rgba(55, 55, 55, 0.5));
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

#undoButton:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 0, 0.5));
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

#clearCanvas:hover {
    background: linear-gradient(135deg, rgba(255, 0, 255, 0.5), rgba(255, 255, 0, 0.5));
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

#brush-slider-container {
    display: none;
    position: absolute;
    top: 250px;
    left: 70px;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

#brush-slider-container input {
    width: 150px;
    margin-bottom: 5px;
}

#brush-size-preview {
    font-size: 1rem;
    margin-top: 5px;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

@media (min-width: 768px) {
    .tools {
        flex-direction: column;
        top: 10px;
        left: 10px;
    }

    #brush-size-container {
        margin-bottom: 20px;
    }
}

@media (max-width: 768px) {
    .tools {
        flex-direction: row;
        justify-content: center;
        bottom: 10px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.8);
        border-top-left-radius: 15px;
        border-top-right-radius: 15px;
    }

    .canvas-container {
        height: 90%;
    }

    canvas {
        height: 100%;
    }

    #brush-slider-container {
        top: -80px;
    }

    #brush-size-container:hover #brush-slider-container {
        top: -100px;
    }
}



.particle {
    position: absolute;
    width: 5px;
    height: 5px;
    background-color: #ff6347;
    border-radius: 50%;
    pointer-events: none;
    animation: particle-animation 0.5s forwards;
}

@keyframes particle-animation {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(2);
        opacity: 0;
    }
}

.footer {
    margin-top: 20px;
    font-size: 1rem;
    color: #555;
}

@media (max-width: 768px) {
    .footer {
        font-size: 0.8rem;
    }
}