body {
    font-family: sans-serif;
    margin: 0;
    padding: 16px;
    background: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #000);
}

.article-card {
    background: var(--tg-theme-secondary-bg-color, #f0f0f0);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.article-card:hover {
    background: var(--tg-theme-button-color, #e0e0e0);
}

#back-button {
    background: var(--tg-theme-button-color, #007aff);
    color: var(--tg-theme-button-text-color, #fff);
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    cursor: pointer;
}