:root {
    --ball-size: 80px;
    --gap: 15px;
    --machine-width: calc(var(--ball-size) * 6 + var(--gap) * 7);

    /* Light Theme */
    --background-color: #f0f0f0;
    --machine-background: #ffffff;
    --text-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --subtle-shadow-color: rgba(0, 0, 0, 0.05);
    --button-gradient-start: #007BFF;
    --button-gradient-end: #0056b3;
    --button-shadow-color: rgba(0, 123, 255, 0.3);
    --button-hover-shadow-color: rgba(0, 123, 255, 0.4);
    --input-background: #f0f0f0;
    --input-border-color: #ddd;
    --input-text-color: #333;
}

body[data-theme="dark"] {
    --background-color: #1a1a1a;
    --machine-background: #2c2c2c;
    --text-color: #f0f0f0;
    --shadow-color: rgba(255, 255, 255, 0.08);
    --subtle-shadow-color: rgba(255, 255, 255, 0.04);
    --button-gradient-start: #3a9dff;
    --button-gradient-end: #006ae0;
    --button-shadow-color: rgba(58, 157, 255, 0.3);
    --button-hover-shadow-color: rgba(58, 157, 255, 0.4);
    --input-background: #3a3a3a;
    --input-border-color: #555;
    --input-text-color: #f0f0f0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 20px 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.05)),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 4 4' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 3h2v1H1V3zm2-2h1v1H3V1z' fill='%23666666' fill-opacity='0.1'/%3E%3C/svg%3E");
    transition: background-color 0.3s ease;
}

.lotto-machine {
    position: relative;
    text-align: center;
    background: var(--machine-background);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 20px 40px var(--shadow-color), 0 5px 15px var(--subtle-shadow-color);
    width: var(--machine-width);
    max-width: 90vw;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    cursor: pointer;
    font-size: 1.5rem;
}

h1 {
    font-size: 2.5em;
    color: var(--text-color);
    margin-bottom: 30px;
    font-weight: 300;
    letter-spacing: 2px;
    transition: color 0.3s ease;
}

.ball-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--gap);
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.ball {
    width: var(--ball-size);
    height: var(--ball-size);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    font-weight: bold;
    color: white;
    box-shadow: inset -5px -5px 15px rgba(0,0,0,0.2), 0 2px 5px rgba(0,0,0,0.2);
    text-shadow: 0 0 5px rgba(0,0,0,0.3);
    transition: transform 0.5s ease, background-color 0.5s ease;
}

.generate-button {
    padding: 15px 40px;
    font-size: 1.2em;
    font-weight: bold;
    color: white;
    background: linear-gradient(145deg, var(--button-gradient-start), var(--button-gradient-end));
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px var(--button-shadow-color);
    outline: none;
    margin-bottom: 30px; /* Added margin */
}

.generate-button:hover {
    background: linear-gradient(145deg, var(--button-gradient-end), var(--button-gradient-start));
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--button-hover-shadow-color);
}

.generate-button:active {
    transform: translateY(1px);
    box-shadow: 0 3px 10px var(--button-shadow-color);
}

.form-container {
    margin-top: 40px;
    border-top: 1px solid var(--input-border-color);
    padding-top: 30px;
    transition: border-color 0.3s ease;
}

.form-container h2 {
    font-size: 2em;
    color: var(--text-color);
    margin-bottom: 20px;
    font-weight: 300;
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border-color);
    border-radius: 8px;
    background-color: var(--input-background);
    color: var(--input-text-color);
    font-size: 1em;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--button-gradient-start);
    box-shadow: 0 0 8px var(--button-shadow-color);
}

.submit-button {
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    font-weight: bold;
    color: white;
    background: linear-gradient(145deg, #28a745, #218838);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.3);
    outline: none;
}

.submit-button:hover {
    background: linear-gradient(145deg, #218838, #28a745);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(40, 167, 69, 0.4);
}

.submit-button:active {
    transform: translateY(1px);
    box-shadow: 0 3px 10px rgba(40, 167, 69, 0.3);
}

@keyframes draw {
    0% { transform: scale(0.8) rotate(0deg); opacity: 0; }
    70% { transform: scale(1.1) rotate(360deg); opacity: 1; }
    100% { transform: scale(1) rotate(360deg); opacity: 1; }
}

.ball.draw-animation {
    animation: draw 0.6s ease-out forwards;
}

@media (max-width: 768px) {
    :root {
        --ball-size: 60px;
        --gap: 10px;
    }
    .lotto-machine {
        padding: 30px;
    }
    h1 {
        font-size: 2em;
    }
}

@media (max-width: 480px) {
    :root {
        --ball-size: 45px;
        --gap: 8px;
    }
    .lotto-machine {
        padding: 20px;
    }
    h1 {
        font-size: 1.8em;
    }
    .ball {
        font-size: 1.5em;
    }
    .generate-button {
        padding: 12px 30px;
        font-size: 1em;
    }
    .theme-switcher {
        font-size: 1.2rem;
        top: 15px;
        right: 15px;
    }
}