:root {
    --bg-color: #f0f0f0;
    --container-bg: #ffffff;
    --text-color: #333333;
    --ball-text-color: white;
    --btn-bg: #4CAF50;
    --btn-text: white;
    --transition-speed: 0.3s;
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, 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 var(--transition-speed), color var(--transition-speed);
}

.container {
    text-align: center;
    padding: 2rem;
    background-color: var(--container-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

body.dark-mode .container {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.lotto-ball {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--ball-text-color);
    font-weight: bold;
    font-size: 1.3em;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s;
}

.lotto-ball:hover {
    transform: scale(1.1);
}

#generate-btn {
    margin-top: 30px;
    padding: 12px 25px;
    font-size: 1.1em;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.2s, transform 0.1s;
}

#generate-btn:hover {
    filter: brightness(1.1);
}

#generate-btn:active {
    transform: translateY(2px);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: none;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all var(--transition-speed);
}

.theme-toggle:hover {
    background-color: var(--text-color);
    color: var(--bg-color);
}