/* 功能特色页面样式 - 菜鸟帮AI论文系统 */

/* 页面头部 */
.page-header {
    padding: 120px 0 80px;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
    color: var(--text-white);
}

.header-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.animated-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px),
        linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(40px, 40px); }
}

.header-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.page-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 1s ease;
}

.page-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: var(--space-xl);
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.2s both;
}

.header-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    animation: fadeInUp 1s ease 0.4s both;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 核心功能展示 */
.core-features {
    padding: var(--space-3xl) 0;
    background: var(--bg-white);
}

.features-showcase {
    max-width: 1000px;
    margin: 0 auto;
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    margin-bottom: var(--space-3xl);
    padding: var(--space-xl) 0;
}

.feature-item.reverse {
    direction: rtl;
}

.feature-item.reverse > * {
    direction: ltr;
}

.feature-visual {
    position: relative;
}

.feature-icon {
    position: absolute;
    top: -20px;
    left: -20px;
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--text-white);
    z-index: 3;
    box-shadow: var(--shadow-lg);
}

.feature-preview {
    background: var(--bg-gray-50);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* 预览窗口样式 */
.preview-window {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.window-bar {
    background: var(--bg-gray-100);
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.window-controls {
    display: flex;
    gap: var(--space-sm);
}

.window-controls::before {
    content: '';
    width: 12px;
    height: 12px;
    background: #ff5f57;
    border-radius: 50%;
    display: block;
}

.window-controls::after {
    content: '';
    width: 12px;
    height: 12px;
    background: #ffbd2e;
    border-radius: 50%;
    display: block;
    margin-left: 4px;
}

.window-title {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.preview-content {
    padding: var(--space-lg);
}

.preview-line {
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    background: var(--bg-gray-50);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.preview-line.title {
    font-weight: 600;
    background: var(--gradient-primary);
    color: var(--text-white);
}

.preview-progress {
    margin-top: var(--space-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-gray-100);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    width: 75%;
    animation: pulse 2s ease-in-out infinite;
}

/* 大纲树样式 */
.outline-tree {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.tree-node {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    margin-bottom: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-normal);
}

.tree-node:hover {
    background: rgba(102, 126, 234, 0.1);
}

.tree-node.root {
    font-weight: 600;
    background: var(--bg-gray-100);
}

.tree-children {
    margin-left: var(--space-lg);
    padding-left: var(--space-md);
    border-left: 2px solid var(--bg-gray-100);
}

.tree-node i {
    color: var(--primary-color);
    width: 16px;
}

/* 文献搜索样式 */
.literature-search {
    width: 100%;
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-lg);
}

.search-bar i {
    color: var(--text-muted);
    margin-right: var(--space-md);
}

.search-bar input {
    border: none;
    outline: none;
    flex: 1;
    font-size: 0.9rem;
}

.search-results {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.result-item {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--bg-gray-100);
}

.result-item:last-child {
    border-bottom: none;
}

.result-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    font-size: 0.9rem;
}

.result-info {
    display: flex;
    gap: var(--space-lg);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.relevance {
    color: var(--primary-color);
    font-weight: 500;
}

/* 功能内容 */
.feature-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-lg);
}

.feature-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.feature-description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.feature-highlights {
    list-style: none;
    padding: 0;
}

.feature-highlights li {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    font-size: 1rem;
    color: var(--text-primary);
}

.feature-highlights i {
    color: #10b981;
    font-size: 1.1rem;
}

/* 详细功能列表 */
.detailed-features {
    padding: var(--space-3xl) 0;
    background: var(--bg-gray-50);
}

.feature-categories {
    max-width: 1000px;
    margin: 0 auto;
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

.tab-button {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-xl);
    background: var(--bg-white);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tab-button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tab-button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.category-content {
    position: relative;
}

.category-panel {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.category-panel.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.5s ease forwards;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-white);
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 280px;
    display: flex;
    flex-direction: column;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.card-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-white);
    margin-bottom: var(--space-md);
    transition: transform var(--transition-normal);
}

.feature-card:hover .card-icon {
    transform: scale(1.1);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

.card-description {
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-md);
    font-size: 0.9rem;
    flex-grow: 1;
}

.card-features {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
    margin-top: auto;
}

.feature-tag {
    padding: var(--space-xs) var(--space-sm);
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

/* 技术优势 */
.tech-advantages {
    padding: var(--space-3xl) 0;
    background: var(--bg-white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.tech-card {
    background: var(--bg-gray-50);
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 320px;
    display: flex;
    flex-direction: column;
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 1;
}

.tech-card:hover::before {
    opacity: 0.05;
}

.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.tech-card > * {
    position: relative;
    z-index: 2;
}

.tech-icon {
    width: 65px;
    height: 65px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--text-white);
    margin-bottom: var(--space-md);
    transition: transform var(--transition-normal);
}

.tech-card:hover .tech-icon {
    transform: scale(1.1) rotate(5deg);
}

.tech-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

.tech-description {
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-md);
    font-size: 0.9rem;
    flex-grow: 1;
}

.tech-details {
    border-top: 1px solid var(--bg-gray-100);
    padding-top: var(--space-lg);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.detail-item:last-child {
    margin-bottom: 0;
}

.detail-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.detail-value {
    font-weight: 600;
    color: var(--primary-color);
}

/* 使用场景 */
.use-cases {
    padding: var(--space-3xl) 0;
    background: var(--bg-gray-50);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.case-card {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.case-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.case-header {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: var(--space-xl);
    text-align: center;
}

.case-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto var(--space-lg);
    transition: transform var(--transition-normal);
}

.case-card:hover .case-icon {
    transform: scale(1.1);
}

.case-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.case-content {
    padding: var(--space-xl);
}

.case-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.case-features {
    list-style: none;
    padding: 0;
}

.case-features li {
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    position: relative;
    padding-left: var(--space-lg);
}

.case-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: 600;
}

/* CTA区域 */
.cta {
    padding: var(--space-3xl) 0;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
    color: var(--text-white);
}

.cta-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.cta-pattern {
    position: absolute;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.15)"/><circle cx="40" cy="80" r="1" fill="rgba(255,255,255,0.2)"/></svg>');
    animation: float 15s ease-in-out infinite;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.cta-subtitle {
    font-size: 1.125rem;
    margin-bottom: var(--space-xl);
    opacity: 0.9;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.cta-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-title {
        font-size: 2.5rem;
    }
    
    .header-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .feature-item {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        text-align: center;
    }
    
    .feature-item.reverse {
        direction: ltr;
    }
    
    .category-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-button {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .features-grid,
    .tech-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
        max-width: 600px;
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}

/* 增强移动端响应式设计 */

/* 平板端优化 */
@media (max-width: 1024px) {
    /* 4列布局在较小的桌面端 */
    .features-grid,
    .tech-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-md);
        max-width: 900px;
    }
    
    .feature-item {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .feature-visual {
        order: 1;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .feature-content {
        order: 2;
    }
    
    .comparison-table {
        font-size: 0.95rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 0.75rem 0.5rem;
    }
}

@media (max-width: 768px) {
    .features-hero h1 {
        font-size: 2.5rem;
    }
    
    .features-hero p {
        font-size: 1.1rem;
    }
    
    .feature-item {
        gap: 1.5rem;
        padding: 2rem 1rem;
    }
    
    .feature-title {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .feature-description {
        font-size: 0.95rem;
        line-height: 1.6;
    }
    
    .feature-visual {
        max-width: 350px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .comparison-table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0 -1rem;
    }
    
    .comparison-table {
        min-width: 600px;
        font-size: 0.9rem;
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .cta-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* 小屏幕移动端优化 */
@media (max-width: 480px) {
    /* 移动端1列布局 */
    .features-grid,
    .tech-grid {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
        max-width: 100%;
    }
    
    .features-hero {
        padding: 5rem 0 3rem;
    }
    
    .features-hero h1 {
        font-size: 2rem;
        line-height: 1.3;
    }
    
    .features-hero p {
        font-size: 1rem;
    }
    
    .feature-item {
        padding: 1.5rem 0.75rem;
        gap: 1rem;
    }
    
    .feature-title {
        font-size: 1.25rem;
        line-height: 1.4;
    }
    
    .feature-description {
        font-size: 0.9rem;
    }
    
    .feature-visual {
        max-width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        max-width: 250px;
        margin: 0 auto;
    }
    
    .stat-item {
        padding: 1rem;
    }
    
    .stat-number {
        font-size: 1.75rem;
    }
    
    .stat-label {
        font-size: 0.85rem;
    }
    
    .comparison-table-container {
        margin: 0 -0.75rem;
    }
    
    .comparison-table {
        min-width: 550px;
        font-size: 0.8rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 0.5rem 0.25rem;
    }
    
    .cta-title {
        font-size: 1.75rem;
        line-height: 1.3;
    }
    
    .cta-subtitle {
        font-size: 0.95rem;
    }
    
    .cta-buttons .btn {
        max-width: 100%;
        padding: 1rem;
        font-size: 0.95rem;
    }
}

/* 动画增强 */
@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.feature-item:nth-child(odd) .feature-visual {
    animation: slideInFromLeft 1s ease both;
}

.feature-item:nth-child(odd) .feature-content {
    animation: slideInFromRight 1s ease 0.2s both;
}

.feature-item:nth-child(even) .feature-visual {
    animation: slideInFromRight 1s ease both;
}

.feature-item:nth-child(even) .feature-content {
    animation: slideInFromLeft 1s ease 0.2s both;
}

/* 滚动触发动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* 超大屏幕优化 */
@media (min-width: 1400px) {
    .features-grid,
    .tech-grid {
        max-width: 1400px;
        gap: var(--space-xl);
    }
    
    .feature-card,
    .tech-card {
        padding: var(--space-xl) var(--space-lg);
    }
    
    .card-title {
        font-size: 1.2rem;
    }
    
    .tech-title {
        font-size: 1.4rem;
    }
    
    .card-description,
    .tech-description {
        font-size: 0.95rem;
    }
}