/**
 * 素材卡片样式
 * 符合代码规范：<400行
 * 4x4网格布局，响应式设计
 */

/* 素材卡片网格容器（单卡固定宽 380px，排布为自动换行） */
.material-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, 380px);
    justify-content: start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    width: 100%;
    min-height: 300px;
    opacity: 1;
    transition: opacity 0.2s ease;
}

/* 搜索/筛选更新期间：保留旧内容并轻微降低透明度，避免骨架闪切 */
.material-card-grid.material-card-grid--updating {
    opacity: 0.58;
}

/* 新结果渲染完成后淡入 */
.material-card-grid.material-card-grid--fade-in {
    animation: materialGridFadeIn 0.22s ease;
}

@keyframes materialGridFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 窄屏：单列铺满，卡片宽度随容器 */
@media (max-width: 768px) {
    .material-card-grid {
        grid-template-columns: 1fr;
    }

    .material-card,
    .material-card-skeleton {
        width: 100%;
        max-width: 100%;
    }
}

/* 素材卡片（整卡 380×220） */
.material-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    box-sizing: border-box;
    width: 380px;
    max-width: 100%;
    height: 220px;
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
}

.material-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-primary); /* 保持原始边框颜色，不使用蓝色accent */
}

/* 卡片预览区域（占满标题区以上剩余高度） */
.material-card-preview {
    width: 100%;
    flex: 1 1 auto;
    min-height: 0;
    background: var(--bg-tertiary);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 分类标签（预览区域左下角） */
.material-card-category-tag {
    position: absolute;
    bottom: 3px;
    left: 3px;
    padding: 5px 10px;
    background: rgba(0, 0, 0, 0.75);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    border-radius: 4px;
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
    line-height: 1.2;
    z-index: 10;
    pointer-events: none;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
    max-width: calc(100% - 12px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.material-card:hover .material-card-category-tag {
    background: rgba(0, 0, 0, 0.85);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* 确保预览区域不会有任何蓝色覆盖 */
.material-card-preview::before,
.material-card-preview::after {
    display: none !important;
    content: none !important;
}

.material-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
    filter: none !important; /* 确保图片不会有任何滤镜效果，包括蓝色调 */
    mix-blend-mode: normal !important; /* 确保图片混合模式正常，不会有颜色叠加 */
    opacity: 1 !important; /* 确保图片完全不透明 */
}

/* 确保图片容器不会有任何伪元素覆盖 */
.material-card-image::before,
.material-card-image::after {
    display: none !important;
    content: none !important;
}

.material-card:hover .material-card-image {
    transform: scale(1.05);
}

/* 卡片遮罩层 */
.material-card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent !important; /* 确保遮罩层完全透明，不会有任何颜色 */
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* 确保遮罩层不会阻挡图片 */
}

.material-card:hover .material-card-overlay {
    opacity: 1;
    background: transparent !important; /* hover时也保持透明 */
}

/* 卡片操作按钮 */
.material-card-actions {
    display: flex;
    gap: var(--spacing-sm);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.material-card:hover .material-card-actions {
    opacity: 1;
}

.material-card-action-btn {
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 11px;
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
    cursor: pointer;
    transition: all 0.2s ease;
}

.material-card-action-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-accent);
    color: var(--text-accent);
}

/* 卡片信息区域 */
.material-card-info {
    padding: 6px 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 0 0 auto;
    min-height: 0;
    overflow: hidden;
}

/* 标题行（名称 + 推荐度） */
.material-card-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    min-height: 20px;
}

/* 卡片名称 */
.material-card-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
}

/* 推荐度区域 */
.material-card-rating {
    display: flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
}

.rating-stars {
    display: flex;
    gap: 2px;
    align-items: center;
}

.rating-star {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

/* 封面图加载态：卡片预览区域转圈圈（避免裂图） */
.material-card-preview {
    position: relative;
}

.material-card-image {
    opacity: 0;
    transition: opacity 0.18s ease;
}

.material-card-image.material-card-image--ready {
    opacity: 1;
}

.material-card-image-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.08);
    pointer-events: none;
}

.material-card-spinner {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.22);
    border-top-color: rgba(255, 255, 255, 0.78);
    animation: materialCardSpin 0.9s linear infinite;
}

@keyframes materialCardSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.rating-star.filled {
    color: #ffc107;
}

.rating-star.half {
    color: #ffc107;
    position: relative;
}

.rating-star.half::after {
    content: '★';
    position: absolute;
    left: 0;
    width: 50%;
    overflow: hidden;
    color: var(--text-muted);
}

/* 详情信息区域 */
.material-card-description {
    font-size: 10px;
    color: var(--text-secondary);
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
    position: relative;
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
    transition: all 0.3s ease;
}

/* 详情信息超出时的滚动效果 */
.material-card-description.has-overflow {
    cursor: help;
}

/* 移除hover展开效果，避免闪屏，只使用弹窗提示 */

/* 详情信息弹窗 */
.material-card-description-tooltip {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 11px;
    color: var(--text-primary);
    max-width: 260px;
    word-wrap: break-word;
    word-break: break-all;
    z-index: 10000;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(-5px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
    line-height: 1.4;
}

.material-card-description-tooltip.show {
    opacity: 1;
    transform: translateY(0);
}

/* 格式标签区域 */
.material-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 2px;
}

.material-card-tag {
    display: inline-block;
    padding: 3px 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    font-size: 10px;
    color: var(--text-secondary);
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
    line-height: 1.2;
    transition: all 0.2s ease;
}

.material-card-tag:hover {
    background: var(--bg-hover);
    border-color: var(--border-accent);
    color: var(--text-accent);
}

/* 空状态 */
.material-card-grid-empty {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    color: var(--text-muted);
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
}

.material-card-grid-empty-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.material-card-grid-empty-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.material-card-grid-empty-hint {
    font-size: 12px;
    color: var(--text-muted);
}

/* 加载状态 */
.material-card-loading {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    color: var(--text-muted);
    font-family: "Microsoft YaHei", "微软雅黑", "SimSun", "宋体", "Arial", sans-serif;
}

.material-card-skeleton {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-sizing: border-box;
    width: 380px;
    max-width: 100%;
    height: 220px;
}

.material-card-skeleton-preview {
    width: 100%;
    flex: 1 1 auto;
    min-height: 120px;
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

.material-card-skeleton-info {
    padding: 6px 8px;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.material-card-skeleton-line {
    height: 12px;
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

.material-card-skeleton-line.short {
    width: 60%;
}

.material-card-skeleton-line.medium {
    width: 80%;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}