:root {
    --background-color: #f0f2f5;
    --container-bg-color: #ffffff;
    --main-accent-color: #4a90e2;
    --text-color: #333333;
    --white-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(74, 144, 226, 0.5);
    --moon-color: #f1c40f;
    --sun-color: #f39c12;
}

body.dark-mode {
    --background-color: #1a1a1a;
    --container-bg-color: #2c2c2c;
    --text-color: #f0f2f5;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(0,0,0,0.05) 1px, transparent 0);
    background-size: 20px 20px;
    transition: background-color 0.3s ease;
}

.container {
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    text-align: center;
    width: 100%;
    max-width: 500px;
    position: relative;
    transition: background-color 0.3s ease;
}

.theme-toggle-button {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.moon-icon {
    width: 24px;
    height: 24px;
    background-color: transparent;
    border-radius: 50%;
    box-shadow: -6px 0 0 0 var(--moon-color) inset;
    transition: transform 0.4s ease-in-out, box-shadow 0.4s ease-in-out;
}

body.dark-mode .moon-icon {
    transform: rotate(180deg);
    box-shadow: 0 0 0 0 var(--sun-color) inset;
}

h1 {
    color: var(--text-color);
    margin-bottom: 30px;
    font-size: 2.5em;
    font-weight: bold;
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 40px;
    min-height: 80px;
}

.lotto-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    color: var(--white-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8em;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.generate-button {
    background-color: var(--main-accent-color);
    color: var(--white-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s, transform 0.3s;
    box-shadow: 0 5px 15px var(--shadow-color), 0 0 0 0 var(--glow-color);
}

.generate-button:hover {
    background-color: #357ABD;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-color), 0 0 20px 10px var(--glow-color);
}

.generate-button:active {
    transform: translateY(1px);
    box-shadow: 0 3px 10px var(--shadow-color), 0 0 0 0 var(--glow-color);
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2em;
    }

    .lotto-number {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
    }

    .generate-button {
        padding: 12px 25px;
        font-size: 1em;
    }
}