/* CSS Custom Properties for theming */
:root {
    --color-primary: #0078D4;
    --color-primary-light: #e3f2fd;
    --color-text: #333;
    --color-text-light: #555;
    --color-text-muted: #666;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-border: #e0e0e0;
    --sidebar-width: 250px;
    --spacing-unit: 1rem;
    --transition-base: all 0.3s ease;
    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* Container with 3-column Layout */
.container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr var(--sidebar-width);
    min-height: 100vh;
}

/* Shared Sidebar Styles */
.sidebar-left,
.sidebar-right {
    background-color: var(--color-bg-alt);
    padding: calc(var(--spacing-unit) * 2);
}

.sidebar-left {
    border-right: 1px solid var(--color-border);
}

.sidebar-right {
    border-left: 1px solid var(--color-border);
}

/* Sidebar Header */
.sidebar-header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 2.5);
    padding-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    margin-bottom: calc(var(--spacing-unit) * 1.25);
    display: flex;
    justify-content: center;
}

.logo img,
.logo svg {
    transition: transform 0.3s ease;
}

.logo img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.logo svg {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo img:hover,
.logo svg:hover {
    transform: scale(1.05);
}

.sidebar-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.625rem;
    line-height: 1.3;
}

.sidebar-description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    font-style: italic;
}

/* Navigation & Archive Links - Shared styles */
.nav-menu,
.archive-section {
    margin-top: calc(var(--spacing-unit) * 2);
}

.nav-menu ul,
.archive-list {
    list-style: none;
}

.nav-menu li,
.archive-list li {
    margin-bottom: 0.9375rem;
}

.nav-link,
.archive-link {
    display: block;
    padding: 0.625rem 0.9375rem;
    text-decoration: none;
    color: var(--color-text-light);
    border-radius: 5px;
    transition: var(--transition-base);
    font-weight: 500;
}

.archive-link {
    font-size: 0.95rem;
}

.nav-link:hover,
.archive-link:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.archive-link:hover {
    padding-left: 1rem;
}

.nav-link.active,
.archive-link.active {
    background-color: var(--color-primary);
    color: white;
}

/* Main Content Area */
.main-content {
    padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 3.125);
    background-color: var(--color-bg);
}

.page-header {
    margin-bottom: calc(var(--spacing-unit) * 2.5);
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: calc(var(--spacing-unit) * 1.25);
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 0.625rem;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* Sections */
.section {
    animation: fadeIn 0.5s ease;
}

.section.hidden {
    display: none;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text);
}

.section p {
    font-size: 1.1rem;
    margin-bottom: 0.9375rem;
    color: var(--color-text-light);
}

/* Blog Posts */
.blog-posts {
    display: flex;
    flex-direction: column;
    gap: 1.5625rem;
}

.blog-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.blog-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5625rem;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.blog-card-link:hover .blog-card {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-primary);
}

.blog-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.9375rem;
    color: var(--color-primary);
}

.post-meta {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 0.9375rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.post-date,
.post-read-time {
    display: flex;
    align-items: center;
    gap: 0.3125rem;
}

.post-excerpt {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: 0;
    line-height: 1.6;
}

/* Archive Section */
.archive-section h3 {
    font-size: 1.3rem;
    margin-bottom: 1.25rem;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 0.625rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 200px;
    }
    
    .main-content {
        padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2.2);
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .sidebar-left,
    .sidebar-right {
        position: static;
        height: auto;
        border: none;
        border-bottom: 1px solid var(--color-border);
        padding: calc(var(--spacing-unit) * 1.25);
    }
    
    .nav-menu ul {
        display: flex;
        justify-content: center;
        gap: 0.625rem;
    }
    
    .nav-menu li,
    .logo {
        margin-bottom: calc(var(--spacing-unit) * 1.25);
    }
    
    .nav-menu li {
        margin-bottom: 0;
    }
    
    .main-content {
        padding: 1.5625rem 1.25rem;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
}

/* Scrollbar Styling */
.sidebar-right::-webkit-scrollbar,
.main-content::-webkit-scrollbar {
    width: 8px;
}

.sidebar-right::-webkit-scrollbar-track,
.main-content::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.sidebar-right::-webkit-scrollbar-thumb,
.main-content::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.sidebar-right::-webkit-scrollbar-thumb:hover,
.main-content::-webkit-scrollbar-thumb:hover {
    background: #555;
}