/* 公告栏样式 - 来自GUI高级组件 */

.announcements-section {
    margin: 3rem 0;
    padding: 2rem 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 50%, #faf5ff 100%);
}

.announcements-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding: 0 0.5rem;
}

.announcements-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.announcements-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
}

.announcements-title h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin: 0;
}

.announcements-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* 筛选栏 */
.announcements-filters {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    background: var(--white);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.filter-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--white);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.filter-badge {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* 统计信息 */
.announcements-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-box {
    background: var(--white);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

.stat-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 公告列表 */
.announcements-list {
    display: grid;
    gap: 1.5rem;
}

.announcement-card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.announcement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: var(--transition);
}

.announcement-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

.announcement-card:hover::before {
    opacity: 1;
}

.announcement-card.pinned {
    border-color: #fbbf24;
    background: linear-gradient(to bottom, #fffbeb, var(--white));
}

/* 公告标签 */
.announcement-badges {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.announcement-badge {
    padding: 0.375rem 0.875rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.badge-urgent {
    background: #fee2e2;
    color: #dc2626;
    border-color: #fca5a5;
}

.badge-warning {
    background: #fed7aa;
    color: #ea580c;
    border-color: #fb923c;
}

.badge-info {
    background: #dbeafe;
    color: #2563eb;
    border-color: #93c5fd;
}

.badge-general {
    background: #f3f4f6;
    color: #6b7280;
    border-color: #d1d5db;
}

.badge-priority-high {
    background: #dc2626;
    color: white;
    border-color: #dc2626;
}

.badge-priority-medium {
    background: #eab308;
    color: white;
    border-color: #eab308;
}

.badge-priority-low {
    background: #16a34a;
    color: white;
    border-color: #16a34a;
}

.badge-pinned {
    background: #fbbf24;
    color: white;
    border-color: #fbbf24;
    animation: pulse-pin 2s infinite;
}

@keyframes pulse-pin {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* 公告内容 */
.announcement-content {
    margin-top: 1rem;
}

.announcement-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.announcement-text {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.announcement-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.meta-item i {
    color: var(--primary-color);
}

/* 空状态 */
.announcements-empty {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.empty-icon {
    font-size: 4rem;
    color: var(--border-color);
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-title {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.empty-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 加载动画 */
.announcement-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .announcements-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .announcements-title h2 {
        font-size: 1.5rem;
    }
    
    .announcements-filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .announcements-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .announcement-card {
        padding: 1.5rem;
    }
    
    .announcement-title {
        font-size: 1.25rem;
    }
    
    .announcement-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
}

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.announcement-card {
    animation: fadeIn 0.5s ease-out backwards;
}

.announcement-card:nth-child(1) { animation-delay: 0.1s; }
.announcement-card:nth-child(2) { animation-delay: 0.2s; }
.announcement-card:nth-child(3) { animation-delay: 0.3s; }
.announcement-card:nth-child(4) { animation-delay: 0.4s; }
.announcement-card:nth-child(5) { animation-delay: 0.5s; }