:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --btn-bg: #008CBA;
    --btn-hover: #005f7a;
    --font-main: 'Roboto', sans-serif;
    --font-title: 'Montserrat', sans-serif;
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --card-shadow: rgba(0, 0, 0, 0.5);
    --btn-bg: #00a8e1;
    --btn-hover: #008CBA;
}

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

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 8px 32px var(--card-shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
    max-width: 500px;
    width: 90%;
}

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

.lotto-numbers {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 30px 0;
    min-height: 60px;
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 16px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 18px;
    font-weight: bold;
    margin: 10px 0;
    cursor: pointer;
    border-radius: 12px;
    transition: background-color 0.3s, transform 0.1s;
    box-shadow: 0 4px 14px 0 rgba(0, 140, 186, 0.39);
}

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

#generate-btn:active {
    transform: scale(0.98);
}

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

#theme-btn {
    background: none;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

#theme-btn:hover {
    background-color: var(--text-color);
    color: var(--container-bg);
}