:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --button-bg: #007bff;
    --button-hover: #0056b3;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --ball-shadow: rgba(0, 0, 0, 0.2);
    --toggle-bg: #eee;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --button-bg: #375a7f;
    --button-hover: #2b4764;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --ball-shadow: rgba(0, 0, 0, 0.6);
    --toggle-bg: #444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 20px 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    background-image: url("data:image/svg+xml,%3Csvg width='42' height='44' viewBox='0 0 42 44' xmlns='http://www.w3.org/2000/svg'%3E%3Cg id='Page-1' fill='none' fill-rule='evenodd'%3E%3Cg id='brick-wall' fill='%239C92AC' fill-opacity='0.1'%3E%3Cpath d='M0 0h42v44H0V0zm1 1h40v20H1V1zM0 23h20v20H0V23zm22 0h20v20H22V23z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.partnership-section {
    margin-top: 30px;
}

.partnership-section h2 {
    margin-bottom: 25px;
    font-size: 1.8rem;
}

.partnership-form {
    text-align: left;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

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

body.dark-mode .form-group input,
body.dark-mode .form-group textarea {
    border-color: #555;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--button-bg);
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

.submit-button {
    width: 100%;
    background-color: #28a745;
    color: white;
    font-size: 1.1rem;
    padding: 15px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: #218838;
}

.container {
    position: relative;
    text-align: center;
    padding: 40px;
    background-color: var(--container-bg);
    border-radius: 16px;
    box-shadow: 0 10px 20px var(--shadow-color), 0 6px 6px var(--shadow-color);
    width: 90%;
    max-width: 500px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

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

#theme-toggle-button {
    background-color: var(--toggle-bg);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#theme-toggle-button:hover {
    transform: scale(1.1);
}

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

.numbers-display {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    min-height: 60px;
}

.number-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 1.8rem;
    font-weight: bold;
    box-shadow: 0 4px 8px var(--ball-shadow);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.generate-button {
    background-color: var(--button-bg);
    color: white;
    font-size: 1.2rem;
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.generate-button:hover {
    background-color: var(--button-hover);
    box-shadow: 0 6px 8px var(--shadow-color);
}

/* Responsive Design */
@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .number-ball {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .generate-button {
        font-size: 1rem;
        padding: 12px 25px;
    }
}