/* css/article-hub.css */

.articles-hub-container {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
}

.articles-hub-container h1 {
    text-align: center;
    font-size: 32px;
    color: var(--title-color);
    margin-bottom: 30px;
}

.article-preview-box {
    display: flex;
    align-items: center;
    gap: 25px;
    background-color: var(--box-bg);
    border: 1px solid var(--header-border);
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-preview-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.article-preview-box h2 {
    color: var(--title-color);
    margin-top: 0;
    font-size: 24px;
}

.article-preview-box p {
    opacity: 0.9;
    margin-bottom: 0;
}

.article-thumbnail {
    width: 150px;
    height: 100px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--header-border);
    flex-shrink: 0;
}

.article-preview-text {
    flex-grow: 1;
}

.glossary-promo-link {
    display: block;
    text-align: center;
    background-color: var(--box-bg);
    border: 1px solid var(--header-border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.glossary-promo-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.glossary-promo-link h3 {
    margin: 0 0 10px 0;
    color: var(--title-color);
    font-size: 22px;
}

.glossary-promo-link p {
    margin: 0;
    color: var(--text-color);
    opacity: 0.9;
}

.hub-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    border-bottom: 2px solid var(--header-border);
    margin-bottom: 30px;
}

.hub-nav-btn {
    padding: 10px 20px;
    cursor: pointer;
    background-color: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
    opacity: 0.7;
    transition: all 0.2s ease-in-out;
    transform: translateY(2px);
}

.hub-nav-btn:hover {
    opacity: 1;
    background-color: var(--box-bg);
}

.hub-nav-btn.active {
    opacity: 1;
    color: var(--link-color);
    border-bottom-color: var(--link-color);
}

.hub-content-pane {
    display: none;
}

.hub-content-pane.active {
    display: block;
}

.placeholder-content {
    background-color: var(--box-bg);
    border: 1px solid var(--header-border);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
}

.placeholder-content h3 {
    color: var(--title-color);
    font-size: 24px;
    margin-top: 0;
}

.placeholder-content p {
    font-size: 16px;
    opacity: 0.9;
    max-width: 600px;
    margin: 10px auto 0 auto;
}

@media (max-width: 600px) {
    .article-preview-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    .article-thumbnail {
        width: 100%;
        height: 150px;
    }
}