body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100%;
    width: 100%;
    font-family: 'Roboto', sans-serif;
}

canvas {
    display: block;
}

/* Interface do Botão de Limpar */
#btn-limpar-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
}

#btn-limpar {
    width: 70px;
    height: 70px;
    background-color: #ff4d4d;
    border-radius: 50%;
    border: none;
    color: white;
    font-weight: bold;
    font-size: 10px;
    cursor: pointer;
    z-index: 2;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

#progress-ring {
    position: absolute;
    transform: rotate(-90deg);
    z-index: 1;
}

.ring-circle {
    transition: stroke-dashoffset 0.1s linear;
    stroke-dasharray: 251.2; /* Circunferência: 2 * PI * 40 */
    stroke-dashoffset: 251.2;
}