@keyframes countdown {
    from {
        transform: scale(1.2);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.countdown-animation {
    animation: countdown 0.5s ease-out;
}

.task-item {
    transition: all 0.3s ease;
}

.task-item:hover {
    transform: translateX(5px);
}

.completed {
    text-decoration: line-through;
    opacity: 0.7;
}

.timer-flash {
    animation: flash 1s infinite;
}

@keyframes flash {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem;
    border-radius: 0.5rem;
    background-color: #4CAF50;
    color: white;
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}