/* ===================================
   社区板块 / Community Section
   风格：现代科技、开放生态、互动活力
   =================================== */

/* 核心变量 */
:root {
    --community-bg: #f8fafc;
    --community-card-bg: #fff;
    --community-primary: #0056D2;
    --community-text-main: #1a1a1a;
    --community-text-sub: #64748b;
    --community-border: #e2e8f0;
    --community-border-light: #cbd5e1;
    --community-bg-light: #f1f5f9;
    --community-text-light: #94a3b8;
    --community-text-medium: #475569;
    --community-text-dark: #334155;
    --community-danger: #ef4444;
    --community-hover-shadow: 0 20px 40px -12px rgba(0, 86, 210, 0.15);
}

.community-section {
    padding: 100px 0;
    background: linear-gradient(to bottom, var(--community-card-bg) 0%, var(--community-bg) 100%);
    position: relative;
    overflow: hidden;
}

/* 背景装饰 */
.community-bg-decoration {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(0, 86, 210, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(0, 86, 210, 0.05) 0%, transparent 40%);
}

.community-section .container {
    position: relative;
    z-index: 1;
}

/* 头部区域：标题 + 统计数据 */
.community-header {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin-bottom: 60px;
    gap: 32px;
}

.community-title-group {
    max-width: 800px;
}

.community-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--community-text-main);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.community-subtitle {
    font-size: 18px;
    color: var(--community-text-sub);
    line-height: 1.6;
}

/* 统计数据条 */
.community-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--community-primary);
    font-family: 'SF Pro Display', system-ui, -apple-system, sans-serif;
    line-height: 1.1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--community-text-sub);
    font-weight: 500;
}

/* 核心入口卡片 (3张) */
.community-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 80px;
}

.action-card {
    background: var(--community-card-bg);
    border: 1px solid var(--community-border);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
}

.action-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--community-hover-shadow);
    border-color: var(--community-primary);
}

/* 卡片顶部强调色条 */
.action-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--community-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.action-card:hover::before {
    transform: scaleX(1);
}

.action-icon {
    width: 48px;
    height: 48px;
    background: rgba(0, 86, 210, 0.08);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--community-primary);
    margin-bottom: 24px;
    transition: background 0.3s ease;
}

.action-icon .lucide {
    width: 24px;
    height: 24px;
}

.action-card:hover .action-icon {
    background: var(--community-primary);
    color: var(--community-card-bg);
}

.action-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--community-text-main);
}

.action-desc {
    font-size: 15px;
    color: var(--community-text-sub);
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.action-link {
    font-size: 15px;
    font-weight: 600;
    color: var(--community-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-link span {
    transition: transform 0.3s ease;
}

.action-card:hover .action-link span {
    transform: translateX(4px);
}

/* 社区动态 Feed */
.community-feed-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--community-border);
    padding-bottom: 16px;
}

.feed-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--community-text-main);
    display: flex;
    align-items: center;
    gap: 12px;
}

.feed-title::before {
    content: '';
    display: block;
    width: 6px;
    height: 24px;
    background: var(--community-primary);
    border-radius: 3px;
}

.community-feed-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

/* 动态卡片 */
.feed-card {
    background: var(--community-card-bg);
    border: 1px solid var(--community-border);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.feed-card:hover {
    border-color: var(--community-border-light);
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.feed-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 13px;
}

.feed-tag {
    padding: 4px 10px;
    background: var(--community-bg-light);
    color: var(--community-text-medium);
    border-radius: 20px;
    font-weight: 600;
}

.feed-date {
    color: var(--community-text-light);
}

.feed-content-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--community-text-main);
    margin-bottom: 12px;
    line-height: 1.4;
    cursor: pointer;
    transition: color 0.2s;
}

.feed-content-title:hover {
    color: var(--community-primary);
}

.feed-excerpt {
    font-size: 15px;
    color: var(--community-text-sub);
    line-height: 1.6;
    margin-bottom: 20px;
    flex-grow: 1;
}

.feed-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--community-bg-light);
}

.feed-author {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--community-text-dark);
    font-weight: 500;
}

.author-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--community-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--community-text-sub);
}

.feed-interactions {
    display: flex;
    gap: 16px;
}

.interaction-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--community-text-sub);
    font-size: 14px;
    transition: all 0.2s;
    padding: 4px 8px;
    border-radius: 6px;
}

.interaction-btn:hover {
    background: var(--community-bg-light);
    color: var(--community-primary);
}

.interaction-btn.active {
    color: var(--community-danger);
}

.interaction-btn.active svg {
    fill: var(--community-danger);
}

/* 加载更多 */
.load-more-container {
    text-align: center;
}

.load-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    background: var(--community-card-bg);
    border: 1px solid var(--community-border);
    color: var(--community-text-main);
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.load-more-btn:hover {
    background: var(--community-bg);
    border-color: var(--community-border-light);
    transform: translateY(-1px);
}

.load-more-btn.loading {
    opacity: 0.7;
    cursor: wait;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--community-border);
    border-top-color: var(--community-text-main);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.load-more-btn.loading .spinner {
    display: block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===================================
   响应式适配
   =================================== */
@media (max-width: 1023px) {
    .community-header {
        align-items: center;
        gap: 32px;
    }
    
    .community-actions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .action-card:last-child {
        grid-column: 1 / -1;
    }
}

@media (max-width: 767px) {
    .community-section {
        padding: 60px 0;
    }
    
    .community-stats {
        width: 100%;
        justify-content: space-between;
        gap: 20px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .community-actions {
        grid-template-columns: 1fr;
    }
    
    .action-card:last-child {
        grid-column: auto;
    }
    
    .community-feed-grid {
        grid-template-columns: 1fr;
    }
    
    .community-title {
        font-size: 28px;
    }
}