:root {
    --bg-gradient: linear-gradient(135deg, #1f1c2c, #3c3b52);
    --container-bg: rgba(255, 255, 255, 0.05);
    --text-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --button-gradient: linear-gradient(135deg, #ff416c, #ff4b2b);
    --button-shadow: rgba(255, 65, 108, 0.4);
    --h1-shadow: rgba(255, 255, 255, 0.5);
}

body.light-mode {
    --bg-gradient: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    --container-bg: rgba(255, 255, 255, 0.9);
    --text-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --button-gradient: linear-gradient(135deg, #667eea, #764ba2);
    --button-shadow: rgba(102, 126, 234, 0.4);
    --h1-shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: var(--bg-gradient);
    color: var(--text-color);
    transition: background 0.5s ease, color 0.5s ease;
}

.container {
    position: relative;
    text-align: center;
    padding: 40px;
    border-radius: 20px;
    background-color: var(--container-bg);
    box-shadow: 0 15px 35px var(--shadow-color);
    transition: background-color 0.5s ease, box-shadow 0.5s ease;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    transition: transform 0.3s ease;
}

#theme-toggle:hover {
    transform: scale(1.2);
}

h1 {
    font-size: 3em;
    margin-bottom: 20px;
    text-shadow: 0 0 10px var(--h1-shadow);
    transition: text-shadow 0.5s ease;
}

.lotto-container {
    margin-bottom: 30px;
}

#generate-btn {
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 50px;
    border: none;
    background: var(--button-gradient);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px var(--button-shadow);
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--button-shadow);
}