/* topics.css - Knowledge Center Styles */

.page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    margin-top: 30px;
    color: var(--text);
}
.page-subtitle {
    color: var(--text-light);
    margin-bottom: 30px;
}

/* Search Form */
.search-form-wrapper {
    margin-bottom: 40px;
}
.search-form {
    display: flex;
    max-width: 500px;
}
.search-form input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 40px 0 0 40px;
    font-size: 1rem;
}
.search-form button {
    background: var(--primary);
    border: none;
    padding: 0 20px;
    border-radius: 0 40px 40px 0;
    color: white;
    cursor: pointer;
}
.search-form button:hover {
    background: var(--primary-dark);
}

/* Topic Cards Grid */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}
.topic-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}
.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}
.topic-card a {
    text-decoration: none;
    display: block;
}
.topic-image {
    aspect-ratio: 16 / 9;
    overflow: hidden;
}
.topic-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.topic-info {
    padding: 15px;
}
.topic-info h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text);
}
.topic-intro {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.5;
    margin-bottom: 12px;
}
.topic-article-count {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 500;
}

/* Sidebar */
.sidebar {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
}
.sidebar h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    border-left: 3px solid var(--primary);
    padding-left: 10px;
}
.sidebar ul {
    list-style: none;
    padding-left: 0;
}
.sidebar li {
    margin-bottom: 10px;
}
.sidebar li a {
    color: var(--text);
    text-decoration: none;
}
.sidebar li a:hover {
    color: var(--primary);
}
.hot-articles-list li {
    display: flex;
    justify-content: space-between;
}
.views {
    color: var(--text-lighter);
    font-size: 0.75rem;
}

.tag-description{margin-bottom: 30px;}
/* Tag Cloud */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.tag-item {
    background: white;
    padding: 5px 12px;
    border-radius: 30px;
    font-size: 0.8rem;
    border: 1px solid var(--border);
    color: var(--text-light);
    text-decoration: none;
}
.tag-item:hover {
    border-color: var(--primary);
    color: white;
}

/* Topic Detail Page */
.topic-header {
    margin-bottom: 40px;
    margin-top: 40px;
}
.topic-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}
.topic-banner {
    margin: 20px 0;
}
.topic-banner img {
    width: 100%;
    border-radius: 12px;
}
.topic-description {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-light);
}
.topic-articles h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}
.article-item {
    display: flex;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 25px;
}
.article-cover {
    flex-shrink: 0;
    width: 180px;
}
.article-cover img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    border-radius: 8px;
}
.article-info {
    flex: 1;
}
.article-info h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}
.article-info h3 a {
    color: var(--text);
    text-decoration: none;
}
.article-info h3 a:hover {
    color: var(--primary);
}
.article-meta {
    display: flex;
    gap: 15px;
    font-size: 0.8rem;
    color: var(--text-lighter);
    margin-bottom: 10px;
}
.article-info p {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 0.9rem;
}
.article-tags {
    margin-top: 10px;
}
.tag-link {
    display: inline-block;
    background: var(--bg-light);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    margin-right: 5px;
    color: var(--text-light);
    text-decoration: none;
}
.tag-link:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* Pagination */
.pagination-wrapper {
    margin-top: 30px;
    text-align: center;
}
.pagination {
    display: inline-flex;
    gap: 8px;
    list-style: none;
    padding-left: 0;
}
.pagination li a {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    text-decoration: none;
    color: var(--text-light);
}
.pagination li.active a {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .article-item {
        flex-direction: column;
    }
    .article-cover {
        width: 100%;
    }
    .topics-grid {
        grid-template-columns: 1fr;
    }
}