:root {
    --bg-color: #f0f2f5;
    --container-bg: #fff;
    --text-color: #333;
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --history-bg: #f8f9fa;
    --border-color: #007bff;
    --ball-shadow: rgba(0, 0, 0, 0.2);
    --container-shadow: rgba(0, 0, 0, 0.1);
}

[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f2f5;
    --primary-color: #375a7f;
    --primary-hover: #2b4764;
    --history-bg: #3d3d3d;
    --border-color: #375a7f;
    --ball-shadow: rgba(0, 0, 0, 0.5);
    --container-shadow: rgba(0, 0, 0, 0.3);
}

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

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--container-shadow);
    text-align: center;
    width: 90%;
    max-width: 500px;
    transition: background-color 0.3s, box-shadow 0.3s;
    position: relative;
}

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

#theme-toggle {
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: bold;
    transition: all 0.3s;
}

#theme-toggle:hover {
    background-color: var(--primary-color);
    color: #fff;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

#generate-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 15px 30px;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

#generate-btn:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 12px rgba(0, 123, 255, 0.5);
}

.history {
    margin-top: 30px;
    text-align: left;
}

.history h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}

#history-list {
    list-style: none;
    padding: 0;
    max-height: 200px;
    overflow-y: auto;
}

#history-list li {
    background-color: var(--history-bg);
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

.partnership {
    margin-top: 40px;
    text-align: left;
}

.partnership h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}

#partnership-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 15px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--history-bg);
    color: var(--text-color);
    font-size: 0.9rem;
    box-sizing: border-box;
    transition: background-color 0.3s, border-color 0.3s;
}

.form-group textarea {
    height: 100px;
    resize: vertical;
}

#submit-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 12px;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.comments {
    margin-top: 40px;
    text-align: left;
}

.comments h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
    margin-bottom: 20px;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    #generate-btn {
        padding: 12px 25px;
    }
}