:root {
    --bg-gradient: linear-gradient(to right, #4facfe, #00f2fe);
    --container-bg: rgba(255, 255, 255, 0.1);
    --text-color: #fff;
    --number-bg: #fff;
    --number-text: #333;
    --btn-bg: #fff;
    --btn-text: #4facfe;
    --btn-hover-bg: #f0f0f0;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

[data-theme='dark'] {
    --bg-gradient: linear-gradient(to right, #1a1a2e, #16213e);
    --container-bg: rgba(255, 255, 255, 0.05);
    --text-color: #e0e0e0;
    --number-bg: #0f3460;
    --number-text: #e94560;
    --btn-bg: #e94560;
    --btn-text: #fff;
    --btn-hover-bg: #cf3d56;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

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

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    cursor: pointer;
    background: var(--container-bg);
    padding: 10px;
    border-radius: 50%;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 0 20px var(--shadow-color);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

h1 {
    color: var(--text-color);
    margin-bottom: 30px;
    font-size: 2.5em;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.number {
    width: 60px;
    height: 60px;
    background-color: var(--number-bg);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8em;
    font-weight: bold;
    color: var(--number-text);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease, color 0.3s ease;
}

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

#generate-btn:hover {
    background-color: var(--btn-hover-bg);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

#generate-btn:active {
    transform: translateY(1px);
    box-shadow: 0 4px 10px var(--shadow-color);
}