:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --container-bg: transparent;
    --number-bg: #fff;
    --number-text: #333;
    --btn-bg: #e0e0e0;
    --btn-text: #333;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --container-bg: #2a2a2a;
    --number-bg: #444;
    --number-text: #fff;
    --btn-bg: #333;
    --btn-text: #fff;
}

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);
    transition: background-color 0.3s, color 0.3s;
    margin: 0;
}

.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 0.3s;
}

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

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--number-bg);
    color: var(--number-text);
    font-size: 24px;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: background-color 0.3s, color 0.3s, transform 0.2s;
}

.number:hover {
    transform: scale(1.1);
}

#generate-btn {
    padding: 12px 24px;
    font-size: 18px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    font-weight: 600;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.2s;
}

#generate-btn:hover {
    filter: brightness(0.9);
    transform: translateY(-2px);
}

#generate-btn:active {
    transform: translateY(0);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px;
    cursor: pointer;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    font-size: 20px;
    transition: all 0.3s;
}