/**
 * ============================================
 * 资源库页面优化样式 - 国风设计
 * 基于02_resource_资源库页面优化.txt要求
 * ============================================
 */

/* ===== 资源库全局背景：动态山水视频底纹 ===== */
.page-bg-video {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.page-bg-video::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(250, 248, 245, 0.3) 0%,
        rgba(250, 248, 245, 0.1) 50%,
        rgba(250, 248, 245, 0.4) 100%
    );
    pointer-events: none;
}

.page-bg-video-media {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    opacity: 0.15; /* 控制在 15% 左右，保证内容清晰可读 */
    pointer-events: none;
    filter: sepia(10%) saturate(80%); /* 添加轻微复古色调 */
}

/* ===== 筛选导航区样式 ===== */
.filter-nav-section {
    background: #E8E5E1;
    padding: 1.5rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(139, 69, 19, 0.1);
}

/* 筛选按钮组 */
.filter-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

/* 国风筛选按钮 */
.filter-btn {
    font-family: var(--font-serif);
    font-size: 15px;
    padding: 10px 24px;
    background: #FFFAF0;
    border: 1px solid var(--color-ink-primary);
    border-radius: var(--border-radius-md);
    color: #5D3A1A;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-btn:hover {
    background: rgba(139, 69, 19, 0.08);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #FFFAF0;
}

.filter-btn i {
    font-size: 1.1rem;
    stroke-width: 1.5px;
}

/* ===== 资源卡片样式 ===== */
.resource-card {
    background: #FFFAF0;
    border: 1px solid #8B4513;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(30px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.resource-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

/* 资源封面图容器 - 3:2比例 */
.resource-image-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 66.67%; /* 3:2比例 */
    overflow: hidden;
    background: linear-gradient(135deg, #F5F0E8 0%, #E8E5E1 100%);
}

.resource-image-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.5s ease;
    filter: blur(0);
}

/* 渐进式加载 - 初始模糊 */
.resource-image-wrapper img.loading {
    filter: blur(10px);
}

/* 封面图边框和投影 */
.resource-image-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 1px solid rgba(139, 69, 19, 0.3);
    box-shadow: inset 0 0 20px rgba(139, 69, 19, 0.05);
    pointer-events: none;
}

.resource-card:hover .resource-image-wrapper img {
    transform: scale(1.05);
}

/* 卡片内容区 */
.resource-card .card-body {
    padding: 1.25rem;
    font-family: var(--font-serif);
}

/* 资源名称 - 二级标题 */
.resource-card .card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #5D3A1A;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

/* 核心文本名、作者名加粗 */
.resource-card .card-title .highlight {
    color: var(--color-ink-primary);
    font-weight: 700;
}

/* 资源类型标签 - 朱砂红 */
.resource-type-tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 3px 10px;
    background: rgba(220, 20, 60, 0.1);
    color: #DC143C;
    border-radius: 4px;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

/* 资源简介 */
.resource-card .card-text {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.6;
    margin-bottom: 1rem;
    /* 文字截断 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 资源元信息（类型 + 适用场景 + 更新时间） */
.resource-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 1rem;
    padding-top: 0.75rem;
    border-top: 1px dashed rgba(139, 69, 19, 0.15);
}

.resource-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.resource-meta i {
    font-size: 0.85rem;
}

/* 资源简介完整内容提示框 */
.resource-tooltip {
    position: absolute;
    background: #FFFAF0;
    border: 1px solid #DC143C;
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 0.85rem;
    color: #5D3A1A;
    line-height: 1.6;
    max-width: 280px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
}

.resource-card:hover .resource-tooltip {
    opacity: 1;
    visibility: visible;
}

/* 操作按钮 */
.resource-card .btn {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    padding: 8px 20px;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast) ease;
}

.resource-card .btn-outline-primary {
    border-color: var(--color-ink-primary);
    color: var(--color-ink-primary);
}

.resource-card .btn-outline-primary:hover {
    background: var(--color-ink-primary);
    color: #FFFAF0;
}

.resource-card .btn-primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.resource-card .btn-primary:hover {
    background: #B8191A;
    border-color: #B8191A;
}

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

.loading-spinner::before {
    content: '';
    width: 40px;
    height: 40px;
    border: 2px solid rgba(139, 69, 19, 0.2);
    border-top-color: #8B4513;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== 下载反馈弹窗 ===== */
.download-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: #FFFAF0;
    border: 2px solid var(--color-ink-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg) 40px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast) ease;
    font-family: var(--font-serif);
}

.download-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.download-toast i {
    font-size: 2.5rem;
    color: #28a745;
    margin-bottom: 12px;
    display: block;
}

.download-toast.error i {
    color: var(--color-accent);
}

.download-toast .toast-message {
    font-size: 1.1rem;
    color: #5D3A1A;
    font-weight: 600;
}

/* ===== 页面标题区 ===== */
.page-header {
    padding: 3rem 0 2rem;
    text-align: center;
}

.page-header h1 {
    font-family: 'Noto Serif SC', 'Source Han Serif SC', '思源宋体', serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: #5D3A1A;
    margin-bottom: 0.75rem;
}

.page-header p {
    font-family: 'Noto Serif SC', 'Source Han Serif SC', '思源宋体', serif;
    font-size: 1.1rem;
    color: #888;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 装饰纹理 ===== */
.page-decoration {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
    opacity: 0.03;
    background-image: 
        linear-gradient(90deg, #8B4513 1px, transparent 1px),
        linear-gradient(#8B4513 1px, transparent 1px);
    background-size: 50px 50px;
}

/* ===== 响应式适配 ===== */
@media (max-width: 768px) {
    .filter-btn {
        font-size: 14px;
        padding: 8px 16px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .resource-card .card-title {
        font-size: 1rem;
    }
    
    .resource-meta {
        font-size: 0.75rem;
    }
}

/* ===== 批量卡片延迟动画 ===== */
.resource-card.delay-1 { transition-delay: 0.1s; }
.resource-card.delay-2 { transition-delay: 0.2s; }
.resource-card.delay-3 { transition-delay: 0.3s; }
.resource-card.delay-4 { transition-delay: 0.4s; }
.resource-card.delay-5 { transition-delay: 0.5s; }
.resource-card.delay-6 { transition-delay: 0.6s; }