/* Base styles */
body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

.container {
    width: 97%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header styles */
.header {
    background-color: #fff;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo {
    margin: 0;
}

.logo a {
    text-decoration: none;
    color: #333;
}

/* Navigation styles */
.main-nav {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
}

.main-nav h3 {
    margin-top: 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e9ecef;
}

.menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu li {
    margin-bottom: 0.5rem;
}

.menu a {
    text-decoration: none;
    color: #333;
    padding: 0.5rem 0;
    display: block;
    transition: color 0.2s ease;
}

.menu a:hover {
    color: #007bff;
}

.menu .active a {
    color: #007bff;
    font-weight: bold;
}

.menu .separator {
    font-weight: bold;
    color: #6c757d;
    padding: 1rem 0 0.5rem;
    margin-top: 0.5rem;
    border-top: 1px solid #e9ecef;
}

/* Main content layout */
.main-content {
    display: flex;
    margin: 2rem 0;
    gap: 2rem;
}

.content {
    flex: 1;
}

.sidebar {
    width: 250px;
}

/* Article styles */
.article-content img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Footer styles */
.footer {
    background: #f8f9fa;
    padding: 2rem 0;
    margin-top: 2rem;
    text-align: center;
}

.validation a {
    color: #6c757d;
    text-decoration: none;
}

.validation a:hover {
    color: #007bff;
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .article-content img {
        width: 100%;
    }
}

/* Print styles */
@media print {
    .main-nav,
    .footer {
        display: none;
    }
    
    .container {
        width: 100%;
        padding: 0;
    }
    
    body {
        font-size: 12pt;
    }
}