body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #18181b; /* Sfondo scuro stile Twitch */
    color: #efeff1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}
#timer {
    font-size: 15vw; /* Dimensione font reattiva */
    font-weight: bold;
    font-variant-numeric: tabular-nums; /* Evita che i numeri saltino */
    line-height: 1;
    margin-bottom: 2rem;
    text-shadow: 0 0 20px rgba(145, 70, 255, 0.5);
}
.controls, .bonus-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    justify-content: center;
}
button {
    padding: 10px 20px;
    font-size: 1.2rem;
    cursor: pointer;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    transition: opacity 0.2s, transform 0.1s;
}
button:hover {
    opacity: 0.9;
}
button:active {
    transform: translateY(2px);
}
.btn-start { background-color: #00e676; color: #000; }
.btn-stop { background-color: #ff1744; color: #fff; }
.btn-pause { background-color: #ffea00; color: #000; }

.btn-bonus {
    background-color: #9146FF; /* Twitch Purple */
    color: white;
    font-size: 1rem;
    min-width: 120px;
}