:root {
    --bg-color: #f0f0f0;
    --container-bg: #ffffff;
    --text-color: #333333;
    --shadow-color: rgba(0,0,0,0.1);
    --button-bg: #4CAF50;
    --button-hover: #45a049;
    --theme-btn-bg: #333;
    --theme-btn-text: #fff;
}

[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --shadow-color: rgba(0,0,0,0.5);
    --button-bg: #2196F3;
    --button-hover: #1e88e5;
    --theme-btn-bg: #f0f0f0;
    --theme-btn-text: #333;
}

body {
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease;
}

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

#theme-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background-color: var(--theme-btn-bg);
    color: var(--theme-btn-text);
    transition: all 0.3s ease;
}

.container {
    text-align: center;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--shadow-color);
    transition: all 0.3s ease;
}

h1 {
    color: var(--text-color);
    margin-bottom: 30px;
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    min-height: 60px;
}

#generate-btn {
    background-color: var(--button-bg);
    color: white;
    padding: 15px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

#generate-btn:hover {
    background-color: var(--button-hover);
}