/**
 * Downloads Page Styles
 * AI家教平台 - 资源下载页面样式
 */

/* 基础布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 主要内容区域 */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 30px 0;
    background: var(--wanwen-gray-bg);
    color: var(--wanwen-dark);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* 页面头部 */
.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--wanwen-dark);
    margin-bottom: 10px;
}

.page-subtitle {
    font-size: 16px;
    color: var(--wanwen-medium);
    margin-bottom: 0;
    max-width: 600px;
    margin: 0 auto;
}

/* 分类导航 */
.category-nav {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.category-link {
    padding: 12px 24px;
    background: var(--wanwen-white);
    color: var(--wanwen-medium);
    text-decoration: none;
    border-radius: 25px;
    border: 2px solid var(--wanwen-gray-border);
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.category-link:hover {
    color: var(--wanwen-dark);
    border-color: var(--wanwen-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(44, 62, 80, 0.1);
}

.category-link.active {
    background: var(--wanwen-dark);
    color: var(--wanwen-white) !important;
    border-color: var(--wanwen-dark);
}

.category-link i {
    margin-right: 8px;
    font-size: 14px;
}

.category-count {
    margin-left: 8px;
    font-size: 12px;
    opacity: 0.8;
}

.category-link.active .category-count {
    color: var(--wanwen-white) !important;
    opacity: 0.9;
}

/* 内容卡片 */
.content-card {
    background: var(--wanwen-white);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 4px 20px rgba(44, 62, 80, 0.08);
    border: 1px solid var(--wanwen-gray-border);
}

/* 筛选表单 */
.filter-form {
    display: grid;
    gap: 20px;
}

.filter-row {
    display: grid;
    grid-template-columns: 3fr 1.5fr 1.5fr 1fr;
    gap: 15px;
    align-items: end;
}

.advanced-filters {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
    margin-top: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-weight: 600;
    color: var(--wanwen-dark);
    margin-bottom: 8px;
    font-size: 14px;
}

.form-input {
    padding: 12px 15px;
    border: 2px solid var(--wanwen-gray-border);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: var(--wanwen-white);
    color: var(--wanwen-dark);
}

.form-input:focus {
    outline: none;
    border-color: var(--wanwen-dark);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

/* 搜索输入框 */
.search-input {
    position: relative;
}

.search-input .form-input {
    padding-left: 45px;
}

.search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--wanwen-medium);
    font-size: 16px;
}

/* 按钮样式 */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    min-height: 44px;
}

/* 详情页按钮扩展 */
.detail-grid .btn {
    border-radius: 10px;
    padding: 12px 25px;
    min-width: 140px;
}

.btn-primary {
    background: var(--wanwen-dark);
    color: var(--wanwen-white);
}

.btn-primary:hover {
    background: #2c3e50;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(44, 62, 80, 0.3);
}

.btn-secondary {
    background: var(--wanwen-gray-light);
    color: var(--wanwen-dark);
    border: 2px solid var(--wanwen-gray-border);
}

.btn-secondary:hover {
    background: var(--wanwen-white);
    border-color: var(--wanwen-dark);
}

/* 复选框样式 */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--wanwen-dark);
}

/* 资源网格 */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

/* 资源卡片 */
.resource-card {
    background: var(--wanwen-white);
    border: 2px solid var(--wanwen-gray-border);
    border-radius: 15px;
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.resource-card:hover {
    border-color: var(--wanwen-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(44, 62, 80, 0.15);
}

.resource-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    background: var(--wanwen-gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    font-size: 20px;
    color: var(--wanwen-dark);
}

.resource-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--wanwen-dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.resource-description {
    font-size: 13px;
    color: var(--wanwen-medium);
    margin-bottom: 15px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--wanwen-light);
}

.resource-tags {
    display: flex;
    gap: 6px;
}

.resource-tag {
    padding: 2px 8px;
    background: var(--wanwen-gray-light);
    border-radius: 12px;
    font-size: 11px;
    color: var(--wanwen-medium);
}

.resource-permission {
    font-weight: 600;
}

.permission-guest { color: #27ae60; }
.permission-normal { color: #3498db; }
.permission-vip { color: #e74c3c; }

/* 加载状态 */
.loading-container {
    text-align: center;
    padding: 40px;
}

.loading-spinner {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid var(--wanwen-gray-border);
    border-radius: 50%;
    border-top-color: var(--wanwen-dark);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 15px;
}

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

.load-more-btn {
    margin: 0 auto;
    min-width: 150px;
}

.no-data {
    text-align: center;
    padding: 40px;
    color: var(--wanwen-medium);
}

.no-data i {
    font-size: 48px;
    margin-bottom: 15px;
    opacity: 0.5;
}

/* 文本样式 */
.text-muted {
    color: var(--wanwen-light);
    text-decoration: none;
}

.text-muted:hover {
    color: var(--wanwen-medium);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .filter-row {
        grid-template-columns: 1fr;
    }
    
    .category-nav {
        justify-content: flex-start;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .main-content {
        padding: 20px 0;
    }
    
    .content-card {
        padding: 20px;
        margin-bottom: 20px;
    }

    /* 详情页响应式 */
    .detail-grid {
        grid-template-columns: 1fr;
    }

    .detail-grid .resource-title {
        font-size: 22px;
    }

    .resource-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .category-link {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .page-title {
        font-size: 20px;
    }
    
    .filter-row {
        gap: 10px;
    }
    
    .btn {
        padding: 10px 16px;
        font-size: 13px;
    }
}

/* ===== 详情页面专用样式 ===== */

/* 面包屑导航 */
.breadcrumb {
    margin-bottom: 30px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    color: var(--wanwen-medium);
}

.breadcrumb-item a {
    color: var(--wanwen-medium);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb-item a:hover {
    color: var(--wanwen-dark);
}

.breadcrumb-separator {
    color: var(--wanwen-light);
    margin: 0 8px;
}

/* 详情页网格布局 */
.detail-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

/* 资源头部 */
.resource-header {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 20px;
}

.resource-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    background: var(--wanwen-gray-light);
}

.resource-badges {
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.badge-featured {
    background: rgba(231, 76, 60, 0.9);
    color: white;
}

.badge-permission {
    background: rgba(255, 255, 255, 0.9);
    color: var(--wanwen-dark);
}

.badge-permission.guest {
    background: rgba(39, 174, 96, 0.9);
    color: white;
}

.badge-permission.vip {
    background: rgba(231, 76, 60, 0.9);
    color: white;
}

/* 详情页资源标题 */
.detail-grid .resource-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--wanwen-dark);
    margin-bottom: 20px;
    line-height: 1.3;
}

/* 资源统计 */
.resource-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 15px;
    background: var(--wanwen-gray-light);
    border-radius: 10px;
    font-size: 14px;
    color: var(--wanwen-medium);
}

.stat-icon {
    color: var(--wanwen-dark);
}

/* 资源标签 */
.resource-labels {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.label {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.label-grade {
    background: var(--wanwen-gray-light);
    color: var(--wanwen-dark);
}

.label-downloads {
    background: #3498db;
    color: white;
    font-weight: 600;
}

.label-subject {
    background: var(--wanwen-gray-light);
    color: var(--wanwen-dark);
}

.label-tag {
    background: var(--wanwen-gray-light);
    color: var(--wanwen-medium);
    font-size: 12px;
}

/* 资源描述 */
.resource-description {
    line-height: 1.6;
    color: var(--wanwen-medium);
    margin-bottom: 25px;
}

.description-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--wanwen-dark);
    margin-bottom: 12px;
}

/* 下载按钮区域 */
.download-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn-disabled {
    background: var(--wanwen-gray-light);
    color: var(--wanwen-light);
    cursor: not-allowed;
}

/* 详情页侧边栏 */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.sidebar-card {
    background: var(--wanwen-white);
    border: 2px solid var(--wanwen-gray-border);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 30px rgba(44, 62, 80, 0.12);
    transition: all 0.3s ease;
}

.sidebar-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(44, 62, 80, 0.15);
}

.sidebar-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--wanwen-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--wanwen-gray-light);
}

.sidebar-title i {
    color: var(--wanwen-dark);
    font-size: 20px;
}

/* 下载区域 */
.download-section {
    text-align: center;
}

.download-btn {
    width: 100%;
    padding: 15px 20px;
    background: linear-gradient(135deg, var(--wanwen-dark) 0%, #2c3e50 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    text-decoration: none;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(44, 62, 80, 0.3);
    background: linear-gradient(135deg, #2c3e50 0%, var(--wanwen-dark) 100%);
}

.download-btn:disabled {
    background: var(--wanwen-gray-light);
    color: var(--wanwen-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.download-btn i {
    font-size: 18px;
}

/* 二维码区域 */
.qrcode-section {
    background: var(--wanwen-gray-light);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.qrcode-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--wanwen-dark);
    margin-bottom: 15px;
}

.qrcode-image {
    width: 150px;
    height: 150px;
    border-radius: 8px;
    background: white;
    padding: 10px;
    margin: 0 auto 15px;
    display: block;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.qrcode-tip {
    font-size: 12px;
    color: var(--wanwen-medium);
    line-height: 1.4;
}

/* 相关资源 */
.related-resource {
    display: flex;
    gap: 12px;
    padding: 12px;
    border-radius: 10px;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 10px;
}

.related-resource:hover {
    background: var(--wanwen-gray-light);
}

.related-image {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--wanwen-gray-light);
    flex-shrink: 0;
}

.related-info {
    flex: 1;
    min-width: 0;
}

.related-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--wanwen-dark);
    margin-bottom: 4px;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-meta {
    font-size: 11px;
    color: var(--wanwen-light);
}

/* 下载说明 */
.download-notice {
    background: var(--wanwen-gray-light);
    border-left: 4px solid var(--wanwen-dark);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.download-notice h4 {
    color: var(--wanwen-dark);
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
}

.download-notice p {
    color: var(--wanwen-medium);
    font-size: 13px;
    line-height: 1.4;
    margin: 0;
}