:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --container-bg: rgba(255, 255, 255, 0.8);
    --btn-bg: #4CAF50;
    --btn-hover: #45a049;
}

[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --text-color: #f0f2f5;
    --container-bg: rgba(45, 45, 45, 0.8);
    --btn-bg: #2e7d32;
    --btn-hover: #1b5e20;
}

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

.container {
    position: relative;
    text-align: center;
    padding: 40px;
    border-radius: 20px;
    background: var(--container-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s;
}

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

#theme-btn {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

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

h1 {
    margin-bottom: 30px;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    min-height: 60px;
}

.number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.5); }
    to { opacity: 1; transform: scale(1); }
}

#generate-btn {
    padding: 15px 30px;
    font-size: 18px;
    color: white;
    background-color: var(--btn-bg);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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