:root {
    --background-color: #f0f2f5;
    --container-background: white;
    --text-color: #333;
    --gradient-color: #d7d7d7;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-image: radial-gradient(var(--gradient-color) 1px, transparent 1px);
    background-size: 16px 16px;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    --background-color: #1a1a1a;
    --container-background: #2a2a2a;
    --text-color: #f0f2f5;
    --gradient-color: #444;
}

.container {
    background-color: var(--container-background);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
    position: relative;
}

.theme-switch-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input {
    display:none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
}

input:checked + .slider {
    background-color: #2196F3;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}


h1 {
    color: var(--text-color);
    margin-bottom: 10px;
    font-size: 2em;
}

#clock {
    color: var(--text-color);
    font-size: 1em;
    margin-bottom: 20px;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.lotto-numbers lotto-ball.spinning div {
    animation: ball-spin 0.5s linear infinite;
}

@keyframes ball-spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}


#previous-numbers-container {
    margin-top: 30px;
    border-top: 1px solid var(--gradient-color);
    padding-top: 20px;
}

#previous-numbers-container h2 {
    color: var(--text-color);
    font-size: 1.5em;
    margin-bottom: 20px;
}

#previous-numbers {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

.previous-set {
    display: flex;
    gap: 10px;
}

.previous-ball {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.9em;
    color: white;
}

#generate-btn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
    margin-top: 30px;
}

#generate-btn:hover {
    background-color: #45a049;
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.5);
}