/* ==========================================
   青龙论坛 - 论坛页面样式
   版本: 1.0.0
   更新日期: 2026-05-07
   ========================================== */

/* 论坛页面标题 */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 4rem 0 3rem;
    margin-top: -1rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.page-header p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* 论坛区域 */
.forum-section {
    padding: 3rem 0 5rem;
    background: var(--body-bg);
}

/* 筛选栏 */
.forum-filter {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-tab.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.filter-sort .form-select {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 0.9375rem;
    padding: 0.5rem 2rem 0.5rem 0.75rem;
}

/* 话题列表 */
.topic-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.topic-item {
    display: flex;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.topic-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.topic-author {
    flex-shrink: 0;
}

.topic-author img {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border-color);
    transition: var(--transition);
}

.topic-item:hover .topic-author img {
    border-color: var(--primary-color);
}

.topic-content {
    flex: 1;
    min-width: 0;
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.topic-header h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0;
    line-height: 1.4;
}

.topic-header h3 a {
    color: var(--text-primary);
}

.topic-header h3 a:hover {
    color: var(--primary-color);
}

.topic-header .badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
    border-radius: 50px;
    flex-shrink: 0;
}

.topic-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.topic-meta {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.topic-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.topic-meta i {
    font-size: 0.9375rem;
}

/* 分页 */
.forum-pagination {
    margin-top: 2rem;
}

.forum-pagination .pagination {
    gap: 0.375rem;
}

.forum-pagination .page-link {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 0.875rem;
    transition: var(--transition);
}

.forum-pagination .page-link:hover {
    background: var(--light-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.forum-pagination .page-item.active .page-link {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

/* 侧边栏卡片 */
.forum-sidebar-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.forum-sidebar-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.forum-sidebar-card h3 i {
    color: var(--primary-color);
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
}

.tag-item {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: var(--light-color);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tag-item:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* 活跃用户 */
.active-users {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.active-user {
    display: flex;
    align-items: center;
    gap: 0.875rem;
}

.active-user img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.active-user .user-info {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.active-user .user-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.active-user .user-posts {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 论坛公告 */
.forum-notices {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.notice-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.notice-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--primary-color);
    color: #fff;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.notice-item a {
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.notice-item a:hover {
    color: var(--primary-color);
}

/* 论坛统计 */
.forum-stats {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.forum-stats .stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--border-color);
}

.forum-stats .stat-item:last-child {
    border-bottom: none;
}

.forum-stats .stat-label {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.forum-stats .stat-value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1rem;
}

/* 模态框样式 */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.modal-header .modal-title {
    font-weight: 700;
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-body .form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.modal-body .form-control,
.modal-body .form-select {
    border-radius: 10px;
    border: 2px solid var(--border-color);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: var(--transition);
}

.modal-body .form-control:focus,
.modal-body .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.1);
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.modal-footer .btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #764ba2);
    border: none;
    border-radius: 10px;
    font-weight: 600;
    padding: 0.625rem 1.5rem;
}

/* 响应式设计 */
@media (max-width: 991.98px) {
    .page-header {
        padding: 3rem 0 2rem;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .forum-filter {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }
    
    .topic-item {
        padding: 1.25rem;
    }
    
    .topic-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .topic-meta {
        gap: 0.875rem;
    }
}

@media (max-width: 767.98px) {
    .page-header h1 {
        font-size: 1.75rem;
    }
    
    .topic-item {
        flex-direction: column;
        gap: 1rem;
    }
    
    .topic-author {
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }
    
    .topic-author img {
        width: 48px;
        height: 48px;
    }
    
    .topic-meta {
        font-size: 0.8125rem;
    }
    
    .forum-sidebar-card {
        padding: 1.25rem;
    }
}

@media (max-width: 575.98px) {
    .filter-tab {
        padding: 0.375rem 0.75rem;
        font-size: 0.875rem;
    }
    
    .topic-header h3 {
        font-size: 1rem;
    }
    
    .topic-excerpt {
        font-size: 0.875rem;
    }
}