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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
    background: #0f0f0f;
    color: #e0e0e0;
    line-height: 1.7;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    min-width: 280px;
    background: #1a1a1a;
    border-right: 1px solid #333;
    padding: 20px;
    overflow-y: auto;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar-header {
    margin-bottom: 24px;
}

.sidebar-header h2 {
    font-size: 18px;
    color: #fff;
    margin-bottom: 8px;
}

.home-link {
    display: inline-block;
    color: #64b5f6;
    text-decoration: none;
    font-size: 14px;
}

.home-link:hover {
    color: #90caf9;
}

.sidebar h3 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #888;
    margin-bottom: 12px;
}

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

.project-list li {
    margin-bottom: 4px;
}

.project-link {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.15s;
}

.project-link:hover {
    background: #2a2a2a;
    color: #fff;
}

.project-link.active {
    background: #1a3a5c;
    color: #64b5f6;
}

.file-list {
    list-style: none;
    margin-left: 12px;
    margin-top: 2px;
}

.file-link {
    display: block;
    padding: 5px 12px;
    border-radius: 4px;
    color: #999;
    text-decoration: none;
    font-size: 13px;
}

.file-link:hover {
    color: #ccc;
    background: #2a2a2a;
}

.file-link.active {
    color: #90caf9;
    background: #1a2a3a;
}

.empty {
    color: #666;
    font-size: 13px;
    font-style: italic;
}

/* Main content */
.content {
    flex: 1;
    padding: 40px 60px;
    max-width: 900px;
}

/* Markdown render */
.markdown-body h1 {
    font-size: 28px;
    color: #fff;
    border-bottom: 2px solid #333;
    padding-bottom: 10px;
    margin-bottom: 24px;
    margin-top: 0;
}

.markdown-body h2 {
    font-size: 22px;
    color: #e8e8e8;
    margin-top: 32px;
    margin-bottom: 16px;
    border-bottom: 1px solid #333;
    padding-bottom: 8px;
}

.markdown-body h3 {
    font-size: 18px;
    color: #ddd;
    margin-top: 24px;
    margin-bottom: 12px;
}

.markdown-body p {
    margin-bottom: 16px;
}

.markdown-body ul, .markdown-body ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.markdown-body li {
    margin-bottom: 6px;
}

.markdown-body a {
    color: #64b5f6;
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body code {
    background: #1e1e1e;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "JetBrains Mono", "Fira Code", monospace;
    font-size: 13px;
    color: #f8c555;
}

.markdown-body pre {
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 20px;
}

.markdown-body pre code {
    background: none;
    padding: 0;
    color: #e0e0e0;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.markdown-body th, .markdown-body td {
    border: 1px solid #333;
    padding: 10px 14px;
    text-align: left;
}

.markdown-body th {
    background: #1e1e1e;
    color: #ccc;
    font-weight: 600;
}

.markdown-body tr:nth-child(even) {
    background: #141414;
}

.markdown-body blockquote {
    border-left: 3px solid #64b5f6;
    padding: 10px 20px;
    margin: 16px 0;
    background: #1a2a3a;
    border-radius: 0 6px 6px 0;
    color: #bbb;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid #333;
    margin: 32px 0;
}

.markdown-body img {
    max-width: 100%;
    border-radius: 8px;
}

.markdown-body input[type="checkbox"] {
    margin-right: 8px;
    accent-color: #64b5f6;
}

/* Responsive */
@media (max-width: 768px) {
    .layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        min-width: auto;
        height: auto;
        position: static;
        border-right: none;
        border-bottom: 1px solid #333;
    }
    .content {
        padding: 20px;
    }
}