/* Navigation CSS - Left-handed Sidebar */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 20%;
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    overflow-y: auto;
    box-shadow: 2px 0 10px var(--shadow-color);
}

.sidebar-header {
    padding: 2rem 1.5rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.site-title a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

.site-title a:hover {
    color: var(--accent-hover);
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0;
}

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

.nav-link {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
    border-left-color: var(--accent-primary);
}

.nav-link.active {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
    border-left-color: var(--accent-primary);
}

/* Submenu */
.submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    background: var(--bg-tertiary);
    border-left: 1px solid var(--border-color);
    margin-left: 1.5rem;
}

.submenu-link {
    display: block;
    padding: 0.5rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-speed) ease;
    border-left: 2px solid transparent;
}

.submenu-link:hover {
    color: var(--accent-primary);
    background: var(--bg-secondary);
    border-left-color: var(--accent-primary);
}

.submenu-link.active {
    color: var(--accent-primary);
    background: var(--bg-secondary);
    border-left-color: var(--accent-primary);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 50%;
    transition: all var(--transition-speed) ease;
    border: 1px solid var(--border-color);
}

.social-link:hover {
    color: var(--accent-primary);
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

/* Mobile Navigation Toggle */
.mobile-nav-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--accent-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 6px;
    padding: 0.75rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all var(--transition-speed) ease;
}

.mobile-nav-toggle:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-speed) ease;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .mobile-nav-toggle {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
        padding-top: 4rem;
    }
    
    /* Overlay for mobile */
    .sidebar::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
        opacity: 0;
        transition: opacity var(--transition-speed) ease;
    }
    
    .sidebar.open::before {
        opacity: 1;
    }
}

/* Scrollbar Styling */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* Animation for submenu expansion */
.submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-speed) ease;
}

.nav-item:hover .submenu,
.nav-item:focus-within .submenu {
    max-height: 200px;
}

/* Focus states for accessibility */
.nav-link:focus,
.submenu-link:focus,
.social-link:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .sidebar {
        border-right: 2px solid var(--text-primary);
    }
    
    .nav-link,
    .submenu-link {
        border-width: 2px;
    }
}