body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #ffffff;
    color: #000000;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    text-align: center;
    padding: 1rem;
}

#timer {
    font-size: 11rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

button {
    background: none;
    border: none;
    width: 2.5rem;
    height: 2.5rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s;
}

button:hover {
    opacity: 0.7;
}

button svg {
    width: 2.5rem;
    height: 2.5rem;
    stroke: #808080;
}

.dark-mode {
    background-color: #000000;
    color: #ffffff;
}

.dark-mode button svg {
    stroke: #a0a0a0;
}