/* 卡片样式 */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--gray-200);
    margin-bottom: 20px;
    transition: all var(--transition-speed);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--box-shadow-lg);
}

.card-header {
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 20px;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h5 {
    margin: 0;
    font-weight: 500;
    font-size: 16px;
    color: var(--text-color);
    display: flex;
    align-items: center;
}

.card-body {
    padding: 20px;
}

.card-footer {
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 12px 20px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* 统计卡片 */
.stat-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--gray-200);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 100px;
    transition: all var(--transition-speed);
    cursor: pointer;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: currentColor;
    opacity: 0.8;
}

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

.stat-card.bg-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    color: #fff;
    border: none;
}

.stat-card.bg-success {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    color: #fff;
    border: none;
}

.stat-card.bg-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
    color: #fff;
    border: none;
}

.stat-card.bg-danger {
    background: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
    color: #fff;
    border: none;
}

/* 新增更柔和的主题色，提升观感 */
.stat-card.bg-info {
    background: linear-gradient(135deg, #06b6d4 0%, #22d3ee 100%);
    color: #fff;
    border: none;
}

.stat-card.bg-secondary {
    background: linear-gradient(135deg, #64748b 0%, #94a3b8 100%);
    color: #fff;
    border: none;
}

.stat-card.bg-dark {
    background: linear-gradient(135deg, #0f172a 0%, #1f2937 100%);
    color: #fff;
    border: none;
}

.stat-card-content {
    flex: 1;
}

.stat-card-content h4 {
    font-size: 14px;
    margin-bottom: 8px;
    opacity: 0.9;
    font-weight: 400;
}

.stat-card-content h2 {
    font-size: 32px;
    font-weight: 700;
    margin: 0;
    line-height: 1;
}

.stat-card-icon {
    font-size: 48px;
    opacity: 0.18;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

/* 细节优化：标题微透明，数值醒目 */
.stat-card-content h4 { opacity: 0.95; letter-spacing: .3px; }
.stat-card-content h2 { text-shadow: 0 1px 2px rgba(0,0,0,.15); }

/* 活动卡片 */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.activity-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 16px;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-speed);
}

.activity-item:hover {
    background-color: var(--gray-50);
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    font-size: 16px;
}

.activity-icon.bg-success {
    background-color: var(--success-color);
}

.activity-icon.bg-primary {
    background-color: var(--primary-color);
}

.activity-icon.bg-info {
    background-color: var(--info-color);
}

.activity-icon.bg-warning {
    background-color: var(--warning-color);
}

.activity-content {
    flex: 1;
}

.activity-content h6 {
    margin: 0 0 5px 0;
    font-weight: 600;
    color: var(--text-color);
}

.activity-content p {
    margin: 0 0 8px 0;
    color: var(--gray-500);
    font-size: 14px;
}

.activity-time {
    font-size: 12px;
    color: var(--gray-400);
}

/* 推荐书籍卡片 */
.recommended-books {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.recommended-book {
    display: flex;
    gap: 12px;
    padding: 12px;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
    border: 1px solid transparent;
}

.recommended-book:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-200);
    transform: translateY(-1px);
}

.book-cover img {
    width: 50px;
    height: 70px;
    object-fit: cover;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.book-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.book-info h6 {
    margin: 0 0 4px 0;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-color);
    line-height: 1.4;
}

.book-info p {
    margin: 0 0 8px 0;
    font-size: 12px;
    color: var(--gray-500);
}

/* 图书卡片 */
.book-cards-container {
    margin-top: 20px;
}

.book-card {
    transition: all var(--transition-speed);
    border: 1px solid var(--gray-200);
}

.book-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.book-card .card-title {
    color: var(--text-color);
    font-weight: 600;
}

.book-card .book-stats .badge {
    font-size: 11px;
}

.book-card .book-actions .dropdown-toggle {
    border: none;
    background: transparent;
    color: var(--gray-600);
}

.book-card .book-actions .dropdown-toggle:hover {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

.book-card .book-meta {
    border-top: 1px solid var(--gray-100);
    padding-top: 12px;
}

/* 过滤区域样式 */
.filter-section {
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
}

.filter-results {
    font-weight: 500;
}

.view-options .btn-group .btn {
    border-color: var(--gray-300);
}

.view-options .btn-group .btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* 页面图书馆信息栏 */
.page-library-info {
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 12px 16px;
    margin-bottom: 16px;
}

.page-library-info .current-library {
    display: flex;
    align-items: center;
    font-size: 14px;
}

.page-library-info .current-library i {
    font-size: 16px;
}

/* 卡片头部动作按钮 */
.card-header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.card-header-actions .btn {
    font-size: 13px;
    padding: 6px 14px;
    height: 34px;
}