* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: #f8fafc;
    color: #1e293b;
    line-height: 1.6;
}

.blog-container {
    display: flex;
    min-height: 100vh;
}

/* Left Sidebar */
.sidebar {
    width: 300px;
    background: white;
    border-right: 1px solid #e2e8f0;
    padding: 2rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 2rem;
}

.sidebar-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 0.5rem;
}

.sidebar-subtitle {
    color: #64748b;
    font-size: 0.875rem;
}

.nav-section {
    margin-bottom: 2rem;
}

.nav-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: #374151;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: #64748b;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s;
    font-size: 0.875rem;
}

.nav-link:hover {
    background: #f1f5f9;
    color: #2563eb;
}

.nav-link.active {
    background: #2563eb;
    color: white;
}

/* Tree View Styles */
.tree-item {
    margin-bottom: 0;
}

.tree-node {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    border-radius: 0.5rem;
    transition: all 0.2s;
    color: #64748b;
    font-size: 0.875rem;
    font-weight: 500;
}

.tree-node:hover {
    background: #f1f5f9;
    color: #2563eb;
}

.tree-icon {
    font-size: 0.75rem;
    transition: transform 0.2s;
    width: 12px;
    text-align: center;
}

.tree-children {
    list-style: none;
    margin-left: 1rem;
    border-left: 1px solid #e2e8f0;
    padding-left: 0.5rem;
}

.tree-leaf {
    margin-bottom: 0.25rem;
}

.tree-post {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    border-radius: 0.25rem;
}

.tree-post:hover {
    background: #f1f5f9;
}

.tree-date {
    background: #2563eb;
    color: white;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    min-width: 24px;
    text-align: center;
}

.tree-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.back-home {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 1rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.back-home:hover {
    background: #f1f5f9;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 300px;
    padding: 2rem;
}

.content-header {
    margin-bottom: 2rem;
}

.content-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.content-subtitle {
    color: #64748b;
}

/* Blog Posts Grid */
.blog-posts {
    display: grid;
    gap: 1.5rem;
}

.blog-post {
    background: white;
    border-radius: 0.75rem;
    padding: 1.5rem;
    border: 1px solid #e2e8f0;
    transition: all 0.2s;
    cursor: pointer;
}

.blog-post:hover {
    border-color: #2563eb;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.post-date {
    color: #64748b;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #1e293b;
}

.post-excerpt {
    color: #64748b;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: #f1f5f9;
    color: #2563eb;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #64748b;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #cbd5e1;
}

/* Blog Post Page Styles */
.post-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background: white;
    border-radius: 0.75rem;
    border: 1px solid #e2e8f0;
    width: 100%;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e2e8f0;
}

.post-content {
    line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.post-content h1 {
    font-size: 2rem;
}

.post-content h2 {
    font-size: 1.5rem;
}

.post-content h3 {
    font-size: 1.25rem;
}

.post-content p {
    margin-bottom: 1rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

.post-content code {
    background: #f1f5f9;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

.post-content pre {
    background: #1e293b;
    color: #f8fafc;
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.post-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.post-content blockquote {
    border-left: 4px solid #2563eb;
    padding-left: 1rem;
    margin: 1rem 0;
    font-style: italic;
    color: #64748b;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
    }

    .main-content {
        margin-left: 0;
    }

    .blog-container {
        flex-direction: column;
    }

    .post-container {
        margin: 1rem;
        padding: 1rem;
    }
}