:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #ecf0f1;
    --text-color: #2c3e50;
    --surface-color: #ffffff;
    --list-item-bg: #f9f9f9;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --button-text-color: #ffffff;
    --field-border-color: #cbd5e1;
}

:root[data-theme="dark"] {
    --primary-color: #5dade2;
    --secondary-color: #58d68d;
    --background-color: #111827;
    --text-color: #e5e7eb;
    --surface-color: #1f2937;
    --list-item-bg: #374151;
    --shadow-color: rgba(0, 0, 0, 0.35);
    --button-text-color: #f9fafb;
    --field-border-color: #4b5563;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
    text-align: center;
    background-color: var(--surface-color);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 20px var(--shadow-color);
    width: min(90vw, 640px);
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 30px;
}

h1 {
    color: var(--primary-color);
    margin: 0;
}

#theme-toggle-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--text-color);
    padding: 10px 14px;
    font-size: 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

#generate-btn {
    background-color: var(--primary-color);
    color: var(--button-text-color);
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#generate-btn:hover {
    background-color: #2980b9;
}

.history {
    margin-top: 40px;
}

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

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

#disqus_thread {
    /* Keep comments readable even in dark mode (Disqus text can stay dark). */
    background-color: #ffffff;
    color: #111827;
    border-radius: 8px;
    padding: 8px;
}

h2 {
    color: var(--secondary-color);
    margin-bottom: 20px;
}

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

#history-list li {
    background-color: var(--list-item-bg);
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 10px;
    box-shadow: 0 2px 5px var(--shadow-color);
}

lotto-numbers {
    display: flex;
    gap: 10px;
}

.partnership-form {
    display: grid;
    gap: 10px;
}

.partnership-form label {
    font-weight: bold;
    font-size: 14px;
}

.partnership-form input,
.partnership-form textarea {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--field-border-color);
    background-color: var(--surface-color);
    color: var(--text-color);
    border-radius: 8px;
    padding: 10px 12px;
    font: inherit;
}

.partnership-form textarea {
    resize: vertical;
}

.partnership-form button {
    background-color: var(--secondary-color);
    color: var(--button-text-color);
    border: none;
    padding: 12px 18px;
    font-size: 15px;
    border-radius: 8px;
    cursor: pointer;
}

@media (max-width: 640px) {
    .container {
        padding: 24px;
    }

    .top-bar {
        flex-direction: column;
        align-items: stretch;
    }

    h1 {
        text-align: center;
    }
}