.topic-header {
    background: linear-gradient(135deg, var(--topic-color-light), var(--topic-color-lighter));
    border: 1px solid var(--topic-color-border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.topic-info {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

/* 主题页面特定的图标样式覆盖 */
.topic-header .topic-icon {
    font-size: 1.4em;
}

.topic-details h1 {
    margin: 0;
    color: var(--topic-color);
    font-size: 1.8em;
}

.topic-stats {
    display: flex;
    gap: 20px;
    color: #666;
    font-size: 0.9em;
}

.topic-description {
    color: #555;
    line-height: 1.5;
}

.topic-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.subscribe-btn {
    background: var(--topic-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
}

.subscribe-btn.subscribed {
    background: #28a745;
}

.subscribe-btn:hover {
    opacity: 0.9;
}

.sort-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1px;
    border-bottom: 1px solid #ddd;
    background: white;
}

.sort-tab {
    padding: 10px 20px;
    text-decoration: none;
    color: #666;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.sort-tab.active {
    color: var(--topic-color);
    border-bottom-color: var(--topic-color);
}

.sort-tab:hover {
    color: var(--topic-color);
}

.topic-subreddits {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.subreddit-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.subreddit-tag {
    background: white;
    border: 1px solid #ddd;
    border-radius: 20px;
    padding: 5px 12px;
    text-decoration: none;
    color: #333;
    font-size: 0.85em;
    transition: all 0.2s;
}

.subreddit-tag:hover {
    border-color: var(--topic-color);
    color: var(--topic-color);
}

.posts-container {
    background: white;
    border-radius: 8px;
    padding: 0;
    margin-bottom: 20px;
}

.no-posts {
    text-align: center;
    padding: 40px;
    color: #666;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.pagination a {
    padding: 8px 12px;
    text-decoration: none;
    color: var(--topic-color);
    border: 1px solid #ddd;
    border-radius: 4px;
}

.pagination a:hover {
    background: var(--topic-color);
    color: white;
}