:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --border-color: #334155;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

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

/* Sidebar Styling */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 4px;
}

.sidebar-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.nav-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0;
}

.folder-group {
    margin-bottom: 16px;
}

.folder-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: 0 20px;
    margin-bottom: 8px;
    font-weight: 600;
}

.file-link {
    display: block;
    padding: 10px 20px;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.file-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.file-link.active {
    background-color: rgba(59, 130, 246, 0.1);
    border-left-color: var(--accent);
    color: var(--accent-hover);
    font-weight: 600;
}

/* Main Content Area */
.content-area {
    flex: 1;
    overflow-y: auto;
    scroll-behavior: smooth;
    position: relative;
}

#content-display {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 40px;
}

.hidden {
    display: none !important;
}

#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.2rem;
    color: var(--text-muted);
}

/* Markdown Styling */
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-weight: 600;
    line-height: 1.2;
}

.markdown-body h1 { font-size: 2.25rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; margin-top: 2em;}
.markdown-body p { margin-bottom: 1em; }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 1em;
    color: var(--text-muted);
    background-color: rgba(255, 255, 255, 0.03);
    padding: 1em;
    margin-bottom: 1em;
    border-radius: 0 8px 8px 0;
}
.markdown-body ul, .markdown-body ol { margin-bottom: 1em; padding-left: 2em; }
.markdown-body hr { border: 0; height: 1px; background: var(--border-color); margin: 2em 0; }
.markdown-body code {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}
.markdown-body pre {
    background-color: #000;
    padding: 1em;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1em;
}
.markdown-body pre code { background: none; padding: 0; }