:root {
    --background-color: #f0f2f5;
    --text-color: #1c1e21;
    --button-bg: #1877f2;
    --button-text: #fff;
    --lotto-ball-bg: #fff;
    --lotto-ball-text: #1c1e21;
    --hero-gradient: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

[data-theme="dark"] {
    --background-color: #18191a;
    --text-color: #e4e6eb;
    --button-bg: #2d88ff;
    --button-text: #fff;
    --lotto-ball-bg: #3a3b3c;
    --lotto-ball-text: #e4e6eb;
}

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    text-align: center;
    background: var(--background-color);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 900px;
}

.hero {
    padding: 20px;
    margin-bottom: 30px;
    border-radius: 15px;
    background: var(--hero-gradient);
    color: #fff;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 900;
    margin: 0;
}

#generate-btn {
    padding: 15px 40px;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 30px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 10px;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

lotto-numbers::part(lotto-ball) {
    background-color: var(--lotto-ball-bg);
    color: var(--lotto-ball-text);
    width: 50px;
    height: 50px;
    line-height: 50px;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    margin: 0 8px;
    animation: pop-in 0.5s ease-out forwards;
}

@keyframes pop-in {
    0% {
        transform: scale(0);
    }
    60% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

.chart-container {
    margin-top: 50px;
    position: relative;
    height: 400px;
    width: 100%;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.theme-switch-wrapper {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}

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

.theme-switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

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

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

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

input:focus + .slider {
    box-shadow: 0 0 1px #2196F3;
}

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

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

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