/* --- Global & Font Settings --- */
:root {
    --sidebar-width: 280px;
    --font-color: #333;
    --bg-color: #f8f9fa;
    --panel-bg: #ffffff;
    --border-color: #dee2e6;
    --primary-color: #007bff;
    --hover-bg: #e9ecef;
}

body {
    font-family: Calibri, 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    font-size: 16px;
    color: var(--font-color);
    background-color: var(--bg-color);
    margin: 0;
    overflow-x: hidden;
}

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

/* --- Sidebar Navigation --- */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background-color: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    padding: 15px;
    box-sizing: border-box;
    transition: transform 0.3s ease-in-out;
    overflow-y: auto;
}
.sidebar-header {
    padding: 0 10px 10px 10px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 10px;
}
.sidebar-header h2 {
    margin: 0;
    font-size: 1.5em;
    color: #212529;
}
.file-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.file-list ul ul {
    padding-left: 20px; /* Indent subdirectories */
}
.file-list li.directory {
    font-weight: bold;
    margin-top: 15px;
    padding: 0 10px;
    color: #555;
    text-transform: capitalize;
    font-size: 0.9em;
    letter-spacing: 0.5px;
}
.file-list a {
    display: block;
    padding: 8px 10px;
    text-decoration: none;
    color: #444;
    border-radius: 5px;
    transition: background-color 0.2s, color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.file-list a:hover {
    background-color: var(--hover-bg);
}
.file-list a.active {
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
}

/* --- Main Content Area --- */
.content-area {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    position: relative;
}
.content-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px 40px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* --- Mobile / Responsive Design --- */
.menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1001;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    width: 40px;
    height: 40px;
    font-size: 24px;
    cursor: pointer;
    line-height: 40px;
    text-align: center;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        z-index: 1000;
        transform: translateX(-100%);
    }
    .app-container.sidebar-open .sidebar {
        transform: translateX(0);
        box-shadow: 3px 0 15px rgba(0,0,0,0.1);
    }
    .content-area {
        padding-top: 70px; /* Space for the fixed button */
        padding-left: 15px;
        padding-right: 15px;
    }
    .content-container {
        padding: 15px 25px;
    }
    .menu-toggle {
        display: block;
    }
}

/* --- Markdown Content Typography --- */
#content h1, #content h2, #content h3, #content h4 { color: #212529; font-weight: 600; border-bottom: 1px solid #eee; padding-bottom: 0.3em; margin-top: 1.5em; }
#content h1 { font-size: 2.2em; }
#content h2 { font-size: 1.8em; }
#content a { color: var(--primary-color); text-decoration: none; }
#content a:hover { text-decoration: underline; }
#content hr { border: 0; border-top: 1px solid #ccc; margin: 2em 0; }
#content code { font-family: 'Consolas', 'Menlo', 'Courier New', monospace; background-color: #e9ecef; padding: .2em .4em; font-size: 85%; border-radius: 3px; }
#content pre { background-color: #f1f1f1; border: 1px solid #ccc; border-radius: 5px; padding: 1em; overflow-x: auto; }
#content pre code { background: none; padding: 0; font-size: 100%; }
#content blockquote { border-left: 4px solid #ccc; padding-left: 1em; color: #666; margin: 1.5em 0; }
#content table { width: 100%; border-collapse: collapse; margin: 1.5em 0; display: block; overflow-x: auto; }
#content th, #content td { border: 1px solid #ddd; padding: 8px 12px; text-align: left; }
#content th { background-color: #f2f2f2; font-weight: 600; }
#content ul, #content ol { padding-left: 2em; }

/* --- RTL (Persian) Specific Styles --- */
#content[dir="rtl"] { text-align: right; }
#content[dir="rtl"] blockquote { border-left: none; border-right: 4px solid #ccc; padding-left: 0; padding-right: 1em; }
#content[dir="rtl"] ul, #content[dir="rtl"] ol { padding-left: 0; padding-right: 2em; }

/* --- Helper States --- */
.loading, .error { color: #888; font-style: italic; text-align: center; padding: 50px 0; }
.error { color: #d9534f; font-style: normal; }