/* ==========================================
   AlgoIndex 2.0: The Algorithm Blog
   ========================================== */

:root {
    --blog-body-font: 'Inter', system-ui, -apple-system, sans-serif;
    --blog-article-width: 1000px;
    --sidebar-bg: #0d1117;
    --sidebar-border: rgba(255, 255, 255, 0.03);
}

/* Layout */
.blog-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding-bottom: var(--spacing-2xl);
    width: 100%;
}

.blog-main {
    width: 100%;
    max-width: var(--blog-article-width);
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-md) var(--spacing-2xl);
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Ultra-Minimalist Sidebar */
.blog-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 220px;
    height: 100vh;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

[data-theme="light"] .blog-sidebar {
    --sidebar-bg: #ffffff;
    --sidebar-border: rgba(0, 0, 0, 0.03);
}

.blog-sidebar.open {
    transform: translateX(0);
}

.blog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.05);
    /* Lighter overlay */
    backdrop-filter: blur(1px);
    -webkit-backdrop-filter: blur(1px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.blog-overlay.active {
    opacity: 1;
    visibility: visible;
}

.sidebar-header {
    padding: 3.5rem 1.25rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-brand {
    font-family: var(--font-family-mono);
    font-weight: 500;
    font-size: 0.8rem;
    color: var(--color-text);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.sidebar-brand .brand-accent {
    color: var(--color-primary);
}

.sidebar-close {
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: color 0.2s ease;
    padding: 2px;
    display: flex;
}

.sidebar-close:hover {
    color: var(--color-text);
}

.blog-nav {
    padding: 1rem 0.5rem;
    flex: 1;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
}

.nav-link {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    color: var(--color-text-tertiary);
    transition: all 0.2s ease;
    font-size: 0.8rem;
    text-decoration: none;
    font-family: var(--font-family-mono);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link.active {
    color: var(--color-text);
    font-weight: 600;
}

/* Collapsible Navigation */
.nav-group {
    margin-bottom: 0.5rem;
}

.nav-group-title {
    list-style: none;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color 0.2s ease;
    font-family: var(--font-family-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-group-title::-webkit-details-marker {
    display: none;
}

.nav-group-title:hover {
    color: var(--color-primary);
}

.nav-group-title .chevron {
    width: 14px;
    height: 14px;
    transition: transform 0.3s ease;
    color: var(--color-text-tertiary);
}

details[open] .nav-group-title .chevron {
    transform: rotate(90deg);
}

.nav-group-list {
    list-style: none;
    padding: 0;
    margin: 0;
    padding-left: 1rem;
    /* Indent sub-items */
    border-left: 1px solid var(--sidebar-border);
    margin-left: 0.75rem;
}

.nav-group-list li {
    margin: 0;
}

.nav-group-list .nav-link {
    font-size: 0.75rem;
    padding: 0.4rem 0.75rem;
    color: var(--color-text-tertiary);
}

.nav-group-list .nav-link:hover {
    color: var(--color-primary);
    background: transparent;
}

.nav-group-list .nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
    background: transparent;
    /* Clean minimalist active state */
}

/* Article Styling */
.post-header {
    margin-bottom: 0;
    text-align: center;
    /* Centered as requested */
}

.post-category {
    display: inline-block;
    font-family: var(--font-family-mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    opacity: 1;
}

.post-title {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.post-meta {
    font-family: var(--font-family-mono);
    font-size: 0.7rem;
    color: var(--color-text-tertiary);
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    align-items: center;
    width: 100%;
    margin: 0 auto;
    flex-wrap: wrap;
}

.post-meta .separator {
    opacity: 0.2;
}

.post-content {
    font-size: 0.9rem;
    /* Further reduced for the requested look */
    line-height: 1.8;
    color: var(--color-text-secondary);
    padding-top: 0;
}

.post-content p {
    margin-bottom: var(--spacing-md);
}

.post-content h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.post-content h2 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-size: 1.4rem;
    color: var(--color-text);
    font-weight: 700;
    letter-spacing: -0.01em;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

/* Minimalist Pagination (Very Low Profile) */
.blog-pagination {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    max-width: 1000px;
    /* Even narrower */
    margin-left: auto;
    margin-right: auto;
}

.pagination-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 50%;
    /* Massive gap as requested */
}

@media (max-width: 640px) {
    .pagination-grid {
        grid-template-columns: 1fr;
    }
}

.pagination-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    padding: 0.75rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    transition: all 0.2s ease;
    text-decoration: none;
}

.pagination-card:hover {
    border-color: var(--color-primary);
    /* No background color change */
}

.pagination-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.55rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    color: var(--color-text-tertiary);
    font-family: var(--font-family-mono);
    transition: color 0.2s ease;
}

.pagination-card:hover .pagination-label {
    color: var(--color-primary);
}

.pagination-card.next .pagination-label {
    flex-direction: row-reverse;
    text-align: right;
}

.pagination-title {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
    transition: color 0.2s ease;
}

.pagination-card:hover .pagination-title {
    color: var(--color-primary);
}

.pagination-next .pagination-title {
    text-align: right;
}

.pagination-card .icon {
    width: 12px;
    height: 12px;
    color: var(--color-text-tertiary);
    transition: all 0.2s ease;
}

.pagination-card:hover .icon {
    color: var(--color-primary);
    transform: translateX(-2px);
}

.pagination-card.next:hover .icon {
    transform: translateX(2px);
}