:root {
    --background-gradient: linear-gradient(to top, #fbc2eb 0%, #a6c1ee 100%);
    --container-bg: #ffffff;
    --text-color: #333;
    --button-gradient: linear-gradient(to right, #4facfe 0%, #00f2fe 100%);
    --button-shadow: 0 4px 15px rgba(79, 172, 254, 0.4);
    --button-shadow-hover: 0 6px 20px rgba(79, 172, 254, 0.6);
    --button-shadow-active: 0 3px 10px rgba(79, 172, 254, 0.5);
}

body[data-theme="dark"] {
    --background-gradient: linear-gradient(to top, #2c3e50 0%, #4ca1af 100%);
    --container-bg: #222;
    --text-color: #f1f1f1;
    --button-gradient: linear-gradient(to right, #6a82fb 0%, #fc5c7d 100%);
    --button-shadow: 0 4px 15px rgba(106, 130, 251, 0.4);
    --button-shadow-hover: 0 6px 20px rgba(106, 130, 251, 0.6);
    --button-shadow-active: 0 3px 10px rgba(106, 130, 251, 0.5);
}


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

#theme-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--container-bg);
    color: var(--text-color);
    border: 1px solid var(--text-color);
    padding: 10px 20px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.container {
    text-align: center;
    padding: 40px;
    border-radius: 20px;
    background-color: var(--container-bg);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}

h1 {
    color: var(--text-color);
    margin-bottom: 30px;
    font-size: 2.5em;
    transition: color 0.3s ease;
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.number-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 1.8em;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

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

#generate-btn:active {
    transform: translateY(-1px);
    box-shadow: var(--button-shadow-active);
}