:root {
    --bg-color: #f0f0f0;
    --container-bg: #fff;
    --text-color: #333;
    --number-bg: #eee;
    --btn-bg: #4CAF50;
    --btn-hover-bg: #45a049;
    --btn-text: white;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --btn-shadow: rgba(0, 0, 0, 0.2);
    --toggle-bg: #ddd;
    --toggle-hover-bg: #ccc;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --number-bg: #444;
    --btn-bg: #66bb6a;
    --btn-hover-bg: #4caf50;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --btn-shadow: rgba(0, 0, 0, 0.4);
    --toggle-bg: #444;
    --toggle-hover-bg: #555;
}

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

.container {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    background-color: var(--container-bg);
    box-shadow: 0 10px 20px var(--shadow-color), 0 6px 6px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    color: var(--text-color);
}

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

.number {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    margin: 0 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#generate-btn {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 5px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 2px 5px var(--btn-shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
}

#generate-btn:hover {
    background-color: var(--btn-hover-bg);
    box-shadow: 0 4px 10px var(--btn-shadow);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background-color: var(--toggle-bg);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    box-shadow: 0 2px 5px var(--btn-shadow);
    transition: background-color 0.3s, transform 0.2s;
    z-index: 1000;
}

.theme-toggle:hover {
    background-color: var(--toggle-hover-bg);
    transform: scale(1.1);
}

/* Hide icons based on current theme */
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
.icon-sun { display: none; }
.icon-moon { display: block; }