:root {
    --background-color: #f0f0f0;
    --text-color: #333;
    --card-bg-color: rgba(255, 255, 255, 0.8);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --card-border: 1px solid rgba(0, 0, 0, 0.1);
    --secondary-text-color: #666;
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --text-color: #fff;
    --card-bg-color: rgba(42, 42, 42, 0.8);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --card-border: 1px solid rgba(255, 255, 255, 0.1);
    --secondary-text-color: #aaa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    overflow: hidden;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    text-align: center;
}

header {
    margin-bottom: 2rem;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    margin: 0;
}

p {
    font-size: 1.2rem;
    color: var(--secondary-text-color);
}

.card {
    background-color: var(--card-bg-color);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    border: var(--card-border);
    backdrop-filter: blur(10px);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h2 {
    font-size: 2rem;
    margin-top: 0;
}

.numbers-display {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.number-ball {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 15px rgba(0, 123, 255, 0.5);
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 25px rgba(0, 123, 255, 0.8);
}

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

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

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

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