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

:root {
    /* 主色调 - 清新蓝色 */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #5dade2;
    --accent-color: #e74c3c;
    
    /* 中性色 */
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #95a5a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #ecf0f1;
    --border-color: #e0e0e0;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== 导航栏 ===== */
.navbar {
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-brand .logo:hover {
    color: var(--primary-dark);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: rgba(52, 152, 219, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all 0.3s ease;
}

/* ===== 主内容区域 ===== */
main {
    min-height: calc(100vh - 200px);
    padding: var(--spacing-xl) 0;
}

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

/* ===== 博客网格布局 ===== */
.blog-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-xl);
    align-items: start;
}

/* ===== 文章列表 ===== */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.article-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.article-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.article-category {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.article-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.article-excerpt {
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.8;
}

.article-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-light);
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: var(--primary-dark);
}

/* ===== 文章详情页 ===== */
.article-detail {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.detail-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.detail-category {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.detail-title {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    line-height: 1.3;
}

.detail-meta {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.detail-content {
    padding: var(--spacing-xl);
    color: var(--text-primary);
    line-height: 1.8;
}

.detail-content h2 {
    font-size: 1.5rem;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    color: var(--text-primary);
}

.detail-content p {
    margin-bottom: var(--spacing-md);
}

.detail-content ul,
.detail-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.detail-content li {
    margin-bottom: var(--spacing-xs);
}

.detail-content code {
    background-color: var(--bg-dark);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.detail-content pre {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.detail-content pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
}

.back-button {
    margin-top: var(--spacing-lg);
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

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

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

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

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

/* ===== 侧边栏 ===== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    position: sticky;
    top: 80px;
}

.widget {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.widget-title {
    padding: var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    font-size: 1rem;
    font-weight: 600;
}

.widget-content {
    padding: var(--spacing-md);
}

.author-avatar {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.avatar-placeholder {
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto;
}

.widget-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.category-list,
.recent-posts {
    list-style: none;
}

.category-list li,
.recent-posts li {
    margin-bottom: var(--spacing-sm);
}

.category-list a,
.recent-posts a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.category-list a:hover,
.recent-posts a:hover {
    color: var(--primary-color);
}

.recent-posts .post-date {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 2px;
}

/* ===== 底部 ===== */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    color: var(--bg-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--primary-light);
}

/* ===== 加载状态 ===== */
.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        transition: left 0.3s ease;
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .article-title {
        font-size: 1.25rem;
    }

    .detail-title {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .detail-header,
    .detail-content {
        padding: var(--spacing-md);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .article-meta,
    .detail-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-brand .logo {
        font-size: 1.25rem;
    }
}

/* ===== 平滑滚动 ===== */
html {
    scroll-behavior: smooth;
}

/* ===== 选中文字样式 ===== */
::selection {
    background-color: var(--primary-color);
    color: white;
}