/* ==========================================================================
   学习资源页面专用样式
   ========================================================================== */

/* 确保基础变量定义 */
:root {
    --purple-50: #faf5ff;
    --purple-100: #f3e8ff;
    --purple-300: #c084fc;
    --purple-600: #9333ea;
    --purple-700: #7c3aed;
    --blue-50: #eff6ff;
    --blue-500: #3b82f6;
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-300: #86efac;
    --success-400: #4ade80;
    --success-600: #16a34a;
    --success-700: #15803d;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
}

[data-theme="dark"] {
    --purple-50: #1e1b4b;
    --purple-100: #312e81;
    --purple-300: #6d28d9;
    --purple-600: #a855f7;
    --purple-700: #7c3aed;
    --blue-50: #1e3a8a;
    --blue-500: #3b82f6;
    --success-50: #14532d;
    --success-100: #166534;
    --success-300: #15803d;
    --success-400: #16a34a;
    --success-600: #22c55e;
    --success-700: #4ade80;
}

/* 简化的页面头部样式 */
.simple-header {
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.page-title-section {
    flex: 1;
}

.page-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.page-title i {
    color: var(--primary-600);
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
    margin: 0;
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.bookmark-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.bookmark-btn:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 快速导航 */
.quick-nav-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
}

.quick-nav {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    scroll-behavior: smooth;
}

.quick-nav::-webkit-scrollbar {
    height: 4px;
}

.quick-nav::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 2px;
}

.quick-nav::-webkit-scrollbar-thumb {
    background: var(--primary-300);
    border-radius: 2px;
}

.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    min-width: 100px;
}

.nav-btn i {
    font-size: 1.25rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.nav-btn span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.nav-btn:hover,
.nav-btn.active {
    border-color: var(--primary-300);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.nav-btn:hover i,
.nav-btn:hover span,
.nav-btn.active i,
.nav-btn.active span {
    color: var(--primary-600);
}

/* 资源区域 */
.resources-section {
    padding: var(--spacing-2xl) 0;
}

/* 精选推荐 */
.featured-resources {
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.section-title i {
    color: var(--warning-500);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

/* 分类区域 */
.resources-categories {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.category-section {
    transition: all var(--transition-normal);
}

.category-section.hidden {
    display: none;
}

.category-header {
    margin-bottom: var(--spacing-xl);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

/* 资源卡片 */
.resource-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.resource-card:hover::before {
    transform: scaleX(1);
}

.resource-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.resource-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-md);
    background: var(--primary-100);
    color: var(--primary-600);
    font-size: 1.125rem;
    flex-shrink: 0;
}

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

.resource-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
    line-height: 1.25;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-provider {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.resource-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.bookmark-icon,
.external-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.8rem;
}

.bookmark-icon:hover {
    background: var(--warning-100);
    color: var(--warning-600);
}

.bookmark-icon.bookmarked {
    background: var(--warning-100);
    color: var(--warning-600);
}

.external-icon:hover {
    background: var(--primary-100);
    color: var(--primary-600);
}

.resource-description {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.125rem;
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.meta-item i {
    font-size: 0.6rem;
}

.resource-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.125rem;
    margin-bottom: var(--spacing-sm);
}

.resource-tag {
    font-size: 0.6rem;
    padding: 0.1rem 0.3rem;
    background: var(--primary-100);
    color: var(--primary-700);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.resource-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-primary);
}

.resource-rating {
    display: flex;
    align-items: center;
    gap: 0.125rem;
}

.stars {
    display: flex;
    gap: 0.1rem;
}

.star {
    color: var(--gray-300);
    font-size: 0.7rem;
}

.star.filled {
    color: var(--warning-500);
}

.rating-text {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-left: 0.125rem;
}

.resource-price {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--success-600);
}

.resource-price.paid {
    color: var(--primary-600);
}

/* 精选卡片特殊样式 */
.featured-card {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    border: none;
}

.featured-card .resource-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.featured-card .resource-title,
.featured-card .resource-description {
    color: white;
}

.featured-card .resource-provider,
.featured-card .meta-item {
    color: rgba(255, 255, 255, 0.8);
}

.featured-card .resource-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.featured-card .resource-footer {
    border-top-color: rgba(255, 255, 255, 0.2);
}

.featured-card .bookmark-icon,
.featured-card .external-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.featured-card .bookmark-icon:hover,
.featured-card .external-icon:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-primary);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    max-height: 60vh;
    overflow-y: auto;
}

.bookmarks-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.bookmark-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.bookmark-item:hover {
    background: var(--bg-tertiary);
}

.bookmark-item-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-md);
    background: var(--primary-100);
    color: var(--primary-600);
    flex-shrink: 0;
}

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

.bookmark-item-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bookmark-item-category {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.remove-bookmark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.remove-bookmark:hover {
    background: var(--danger-100);
    color: var(--danger-600);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .page-header .header-content {
        gap: var(--spacing-lg);
    }

    .header-actions {
        justify-content: center;
    }

    .featured-grid {
        grid-template-columns: 1fr;
    }

    .resources-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .header-top {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }

    .page-title {
        font-size: 1.75rem;
    }

    .quick-nav {
        justify-content: flex-start;
        gap: var(--spacing-xs);
    }

    .nav-btn {
        min-width: 80px;
        padding: var(--spacing-sm);
    }

    .nav-btn i {
        font-size: 1rem;
    }

    .nav-btn span {
        font-size: 0.625rem;
    }

    .resource-card {
        padding: var(--spacing-sm);
    }

    .resource-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .resource-info {
        width: 100%;
    }

    .resource-title {
        white-space: normal;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        display: -webkit-box;
        overflow: hidden;
    }

    .resource-meta {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }

    .modal-content {
        width: 95%;
        margin: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 1.5rem;
    }
    
    .header-actions {
        justify-content: center;
    }

    .bookmark-btn {
        width: 100%;
        justify-content: center;
    }

    .resources-grid {
        grid-template-columns: 1fr;
    }

    .resource-footer {
        flex-direction: column;
        gap: var(--spacing-xs);
        align-items: flex-start;
    }
}

/* 保留必要的动画 */

@keyframes expandAccent {
    0% {
        width: 0;
        opacity: 0;
    }
    100% {
        width: 60px;
        opacity: 1;
    }
}

@keyframes slideInLeft {
    0% {
        transform: translateX(-30px);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
    }
}