/* 
 * YoyooAI - 设计×AI跨界实验室
 * 主样式表
 */

/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 变量定义 */
:root {
    /* 颜色变量 */
    --color-primary: #0066FF;
    --color-secondary: #FF375F;
    --color-dark: #000000;
    --color-light: #FFFFFF;
    --color-gray-100: #F5F5F7;
    --color-gray-200: #E5E5E7;
    --color-gray-300: #D1D1D6;
    --color-gray-400: #A1A1A6;
    --color-gray-500: #86868B;
    --color-gray-600: #636366;
    --color-gray-700: #48484A;
    --color-gray-800: #3A3A3C;
    --color-gray-900: #1C1C1E;
    
    /* 字体变量 */
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* 间距变量 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    
    /* 其他变量 */
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --box-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --box-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --box-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --max-width: 1200px;
}

/* 基础样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: var(--space-sm);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

ul, ol {
    list-style: none;
}

img, svg {
    max-width: 100%;
    height: auto;
}

/* 布局组件 */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section-title {
    margin-bottom: var(--space-lg);
    position: relative;
    text-align: center;
}

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

/* 通用组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
}

.btn.primary {
    background-color: var(--color-primary);
    color: var(--color-light);
}

.btn.primary:hover {
    background-color: #0055cc; /* 深一点的蓝色 */
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-md);
}

.btn.secondary {
    background-color: var(--color-secondary);
    color: var(--color-light);
}

.btn.secondary:hover {
    background-color: #e02e50; /* 深一点的粉色 */
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-md);
}

.btn.outline {
    background-color: transparent;
    border: 1px solid currentColor;
    color: var(--color-primary);
}

.btn.outline:hover {
    background-color: var(--color-gray-100);
    transform: translateY(-2px);
}

.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background-color: rgba(0, 102, 255, 0.1);
    color: var(--color-primary);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

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

.view-all:hover {
    text-decoration: underline;
}

.highlight {
    color: var(--color-secondary);
    font-weight: 500;
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

/* 导航栏 */
.site-header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.logo svg {
    margin-right: 0.75rem;
}

/* 主导航栏样式 */
.main-nav {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.nav-content {
    display: flex;
    justify-content: flex-end; /* 将内容对齐到右侧 */
    align-items: center;
    gap: 2rem; /* logo和导航之间的间距 */
}

.logo {
    margin-right: auto; /* logo推到最左边 */
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.main-nav ul {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    font-weight: 500;
    position: relative;
    color: var(--color-text);
    text-decoration: none;
}

.main-nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-normal);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

/* 英雄区域 */
.hero {
    padding: var(--space-xl) 0;
    position: relative;
    overflow: hidden;
    min-height: 320px;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    margin-bottom: var(--space-sm);
}

.hero-content .subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-md);
    max-width: 40ch;
}

.cta-buttons {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-svg {
    max-width: 100%;
    height: auto;
}

/* 介绍区域 */
.intro {
    padding: var(--space-xl) 0;
    background-color: var(--color-gray-100);
}

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

.feature-card {
    background-color: var(--color-light);
    border-radius: var(--border-radius-lg);
    padding: var(--space-md);
    box-shadow: none; /* 默认无投影 */
    transition: var(--transition-normal);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-md);
}

.feature-card .icon {
    margin-bottom: var(--space-sm);
}

.feature-card h3 {
    margin-bottom: var(--space-xs);
    font-size: 1rem; /* 比核心作品预览卡片标题小2号 */
}

.feature-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition-normal);
}

.feature-card-link:hover .feature-card {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-md);
}

.capability-subtitle {
    font-size: 0.875rem;
    color: #000000;
    font-style: italic;
    opacity: 0.6;
    margin-bottom: var(--space-xs);
}

.x-symbol {
    font-weight: 300;
    font-size: 0.8em;
    margin: 0 0.2em;
    color: #000000; /* 改为黑色 */
    opacity: 0.6;
}

/* 核心作品预览卡片标题 */
.project-card .project-info h3 {
    font-size: 1.25rem;
}

.capability-description {
    color: var(--color-gray-600);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* 最新项目 */
.recent-projects {
    padding: var(--space-xl) 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

/* 项目卡片链接样式 */
.project-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-card {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: none;
    transition: var(--transition-normal);
}

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

.project-thumbnail {
    aspect-ratio: 3/2;
    position: relative;
    overflow: hidden;
}

.project-thumbnail svg {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-info {
    padding: var(--space-sm) calc(var(--space-md) * 0.5);
}

.project-info h3 {
    margin-bottom: var(--space-xs);
}

.project-info p {
    color: var(--color-gray-600);
    margin-bottom: var(--space-sm);
}

.tags {
    display: flex;
    flex-wrap: wrap;
}

/* AI实验室预览 */
.ai-lab-preview {
    padding: var(--space-xl) 0;
    background-color: var(--color-gray-100);
}

.lab-preview-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

.lab-description {
    padding-right: var(--space-md);
}

.lab-visual {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow-md);
}

/* 博客最新文章 */
.recent-posts {
    padding: var(--space-xl) 0;
}

.posts-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.post-card {
    padding: var(--space-md);
    border-radius: var(--border-radius-lg);
    box-shadow: none; /* 默认无投影 */
    transition: var(--transition-normal);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.post-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-md);
}

.post-date {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    margin-bottom: var(--space-xs);
}

.post-title {
    margin-bottom: var(--space-xs);
    font-size: 1.125rem; /* 与其他卡片标题一致 */
}

.post-excerpt {
    color: var(--color-gray-600);
    margin-bottom: var(--space-sm);
}

.read-more {
    color: var(--color-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.read-more:hover {
    text-decoration: underline;
}

/* 页脚 */
.site-footer {
    background-color: var(--color-gray-900);
    color: var(--color-light);
    padding: var(--space-lg) 0 var(--space-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.footer-logo svg {
    margin-right: 0.75rem;
}

.footer-description {
    color: var(--color-gray-400);
    margin-bottom: var(--space-md);
    max-width: 35ch;
}

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-gray-800);
    color: var(--color-gray-300);
    transition: var(--transition-normal);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: var(--color-light);
    transform: translateY(-3px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.footer-links-column h3 {
    color: var(--color-gray-300);
    margin-bottom: var(--space-sm);
    font-size: 1.125rem;
}

.footer-links-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-links-column a {
    color: var(--color-gray-400);
}

.footer-links-column a:hover {
    color: var(--color-light);
}

.copyright {
    text-align: center;
    color: var(--color-gray-500);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-gray-800);
}

/* 响应式设计 */
@media (max-width: 992px) {
    html {
        font-size: 15px;
    }
    
    .hero .container,
    .lab-preview-content {
        grid-template-columns: 1fr;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-content .subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .cta-buttons {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none; /* 在移动端隐藏导航链接，而不是整个导航 */
    }
}

@media (max-width: 576px) {
    .features,
    .projects-grid,
    .posts-list {
        grid-template-columns: 1fr;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content, .hero-visual {
    animation: fadeIn 1s ease-out;
}

.feature-card:nth-child(1) {
    animation: fadeIn 1s ease-out 0.2s both;
}

.feature-card:nth-child(2) {
    animation: fadeIn 1s ease-out 0.4s both;
}

.feature-card:nth-child(3) {
    animation: fadeIn 1s ease-out 0.6s both;
}