/**
 * Blog System Styles
 * Tundra Tech Website
 */

/* ============================================
   Font Imports
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=JetBrains+Mono:wght@500;600&display=swap');

/* ============================================
   CSS Variables
   ============================================ */
:root {
    --blog-primary: #0066cc;
    --blog-secondary: #00ccff;
    --blog-accent: #ff6600;
    --blog-bg-primary: #ffffff;
    --blog-bg-secondary: #f5f7fa;
    --blog-bg-tertiary: #e8ecf1;
    --blog-text-primary: #1a1a1a;
    --blog-text-secondary: #666666;
    --blog-text-muted: #999999;
    --blog-border: #e0e0e0;
    --blog-shadow: rgba(0, 0, 0, 0.1);
    --blog-shadow-hover: rgba(0, 0, 0, 0.15);
    --blog-radius: 8px;
    --blog-radius-lg: 12px;
    --blog-transition: 0.3s ease;
    --sidebar-width: 280px;
    --search-height: 60px;
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --blog-bg-primary: #1a1a1a;
        --blog-bg-secondary: #2a2a2a;
        --blog-bg-tertiary: #3a3a3a;
        --blog-text-primary: #f0f0f0;
        --blog-text-secondary: #b0b0b0;
        --blog-text-muted: #808080;
        --blog-border: #404040;
        --blog-shadow: rgba(0, 0, 0, 0.3);
        --blog-shadow-hover: rgba(0, 0, 0, 0.4);
    }
}

/* ============================================
   Layout
   ============================================ */
.blog-layout {
    display: flex;
    min-height: 100vh;
    background: var(--blog-bg-secondary);
    align-items: flex-start;
}

.blog-sidebar-container {
    width: var(--sidebar-width);
    background: var(--blog-bg-primary);
    border-right: 1px solid var(--blog-border);
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--blog-transition);
    padding-top: 1rem;
    z-index: 50;
}

/* Custom scrollbar for sidebar */
.blog-sidebar-container::-webkit-scrollbar {
    width: 8px;
}

.blog-sidebar-container::-webkit-scrollbar-track {
    background: transparent;
}

.blog-sidebar-container::-webkit-scrollbar-thumb {
    background: rgba(0, 180, 219, 0.5);
    border-radius: 4px;
}

.blog-sidebar-container::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 180, 219, 0.8);
}

/* Firefox scrollbar */
.blog-sidebar-container {
    scrollbar-color: rgba(0, 180, 219, 0.5) transparent;
    scrollbar-width: thin;
}

.blog-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    width: calc(100% - var(--sidebar-width));
    padding-top: 0;
}

/* ============================================
   Sidebar
   ============================================ */
.blog-sidebar {
    padding: 1.5rem;
}

.sidebar-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--blog-border);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--blog-text-primary);
    margin: 0;
}

.sidebar-home-link {
    color: var(--blog-text-primary);
    text-decoration: none;
    transition: color var(--blog-transition);
    cursor: pointer;
}

.sidebar-home-link:hover {
    color: var(--blog-primary);
}

.sidebar-home-link:focus {
    outline: 2px solid var(--blog-primary);
    outline-offset: 2px;
    border-radius: var(--blog-radius);
}

/* Category Tabs */
.category-tabs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-tab {
    border-radius: var(--blog-radius);
    overflow: hidden;
    transition: background-color var(--blog-transition);
}

.category-tab.active {
    background: var(--blog-bg-secondary);
}

.category-button {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--blog-text-primary);
    transition: all var(--blog-transition);
    text-align: left;
}

.category-button:hover {
    background: var(--blog-bg-secondary);
}

.category-button:focus {
    outline: 2px solid var(--blog-primary);
    outline-offset: -2px;
}

.category-name {
    flex: 1;
}

.post-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 24px;
    padding: 0 8px;
    background: var(--blog-bg-tertiary);
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--blog-text-secondary);
    margin-right: 0.5rem;
}

.expand-icon {
    font-size: 1.5rem;
    line-height: 1;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--blog-text-muted);
}

.category-button[aria-expanded="true"] .expand-icon {
    transform: rotate(90deg);
}

/* Subcategory Panel */
.subcategory-panel {
    padding: 0.5rem 0 0.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow: hidden;
    max-height: 1000px;
    opacity: 1;
    transition: max-height 0.4s ease-in-out, 
                opacity 0.3s ease-in-out,
                padding 0.3s ease-in-out;
}

.subcategory-panel[hidden] {
    max-height: 0;
    opacity: 0;
    padding-top: 0;
    padding-bottom: 0;
}

.subcategory-button {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem 1rem;
    background: none;
    border: none;
    border-left: 3px solid transparent;
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--blog-text-secondary);
    transition: all var(--blog-transition);
    text-align: left;
    border-radius: 0 var(--blog-radius) var(--blog-radius) 0;
}

.subcategory-button:hover {
    background: var(--blog-bg-primary);
    color: var(--blog-text-primary);
    border-left-color: var(--blog-primary);
}

.subcategory-button.active {
    background: var(--blog-bg-primary);
    color: var(--blog-primary);
    border-left-color: var(--blog-primary);
    font-weight: 600;
}

.subcategory-button:focus {
    outline: 2px solid var(--blog-primary);
    outline-offset: -2px;
}

.subcategory-name {
    flex: 1;
}

.subcategory-button .post-count {
    background: transparent;
    color: var(--blog-text-muted);
}

.subcategory-button.active .post-count {
    color: var(--blog-primary);
}

/* ============================================
   Search
   ============================================ */
.search-container {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--blog-bg-primary);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--blog-border);
    display: flex;
    align-items: center;
    gap: 2rem;
    justify-content: space-between;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 600px;
}

.search-box input {
    width: 100%;
    padding: 0.875rem 3rem 0.875rem 1.25rem;
    font-size: 1rem;
    border: 2px solid var(--blog-border);
    border-radius: var(--blog-radius-lg);
    background: var(--blog-bg-secondary);
    color: var(--blog-text-primary);
    transition: all var(--blog-transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--blog-primary);
    background: var(--blog-bg-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.search-clear {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border: none;
    background: var(--blog-bg-tertiary);
    border-radius: 50%;
    color: var(--blog-text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--blog-transition);
}

.search-clear:hover {
    background: var(--blog-primary);
    color: white;
}

/* Search Mode Toggle */
.search-mode-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
    background: var(--blog-primary);
    border-radius: 14px;
    transition: background-color var(--blog-transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    top: 3px;
    background: white;
    border-radius: 50%;
    transition: transform var(--blog-transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider {
    background: var(--blog-accent);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.toggle-label input[type="checkbox"]:focus + .toggle-slider {
    outline: 2px solid var(--blog-primary);
    outline-offset: 2px;
}

.toggle-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.mode-quick,
.mode-deep {
    transition: color var(--blog-transition);
}

.mode-quick {
    color: var(--blog-primary);
}

.mode-deep {
    color: var(--blog-text-muted);
}

.toggle-label input[type="checkbox"]:checked ~ .toggle-text .mode-quick {
    color: var(--blog-text-muted);
}

.toggle-label input[type="checkbox"]:checked ~ .toggle-text .mode-deep {
    color: var(--blog-accent);
}

/* Search Result Indicators */
.search-result-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--blog-bg-secondary);
    border-radius: var(--blog-radius);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

/* Search Section Divider */
.search-section-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 3rem 0 2rem 0;
}

.divider-line {
    flex: 1;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--blog-border), transparent);
}

.divider-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0 1rem;
}

.divider-label .search-type-badge {
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8125rem;
    background: var(--blog-accent);
    color: white;
}

.divider-text {
    font-size: 0.875rem;
    color: var(--blog-text-muted);
    font-style: italic;
}

.deep-search-section {
    margin-top: 2rem;
}

.search-result-indicator.quick-search {
    border-left: 4px solid var(--blog-primary);
}

.search-result-indicator.deep-search {
    border-left: 4px solid var(--blog-accent);
}

.search-result-indicator .search-type-badge {
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
}

.search-result-indicator.quick-search .search-type-badge {
    background: var(--blog-primary);
    color: white;
}

.search-result-indicator.deep-search .search-type-badge {
    background: var(--blog-accent);
    color: white;
}

/* Deep Search Result Highlights */
.post-card.deep-search-result {
    position: relative;
}

.post-card.deep-search-result::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--blog-accent);
    border-radius: var(--blog-radius-lg) 0 0 var(--blog-radius-lg);
}

.post-card-match-context {
    font-size: 0.875rem;
    color: var(--blog-text-secondary);
    background: var(--blog-bg-secondary);
    padding: 0.75rem;
    border-radius: var(--blog-radius);
    margin-top: 0.75rem;
    border-left: 3px solid var(--blog-accent);
    position: relative;
    cursor: help;
}

/* Tooltip backdrop */
.match-tooltip-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    transition-delay: 0s;
    z-index: 999;
}

.post-card-match-context:hover .match-tooltip-backdrop,
.match-tooltip:hover ~ .match-tooltip-backdrop {
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0.5s;
}

.post-card-match-context .match-preview {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.post-card-match-context .match-item {
    display: flex;
    gap: 0.5rem;
    line-height: 1.5;
}

.post-card-match-context .match-number {
    font-weight: 700;
    color: var(--blog-accent);
    flex-shrink: 0;
}

.post-card-match-context .match-text {
    flex: 1;
}

.post-card-match-context .match-highlight {
    background: rgba(255, 102, 0, 0.2);
    color: var(--blog-accent);
    font-weight: 600;
    padding: 0 0.25rem;
    border-radius: 2px;
}

.post-card-match-context .match-more {
    margin-top: 0.25rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--blog-border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-card-match-context .more-indicator {
    font-style: italic;
    color: var(--blog-text-muted);
    font-size: 0.8125rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.post-card-match-context .more-indicator::after {
    content: '👁';
    font-size: 1rem;
    animation: hover-hint 2s ease-in-out infinite;
}

@keyframes hover-hint {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
}

.post-card-match-context:hover .more-indicator::after {
    animation: none;
    opacity: 1;
}

/* Match Tooltip */
.match-tooltip {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--blog-bg-primary);
    border: 2px solid var(--blog-accent);
    border-radius: var(--blog-radius);
    padding: 1rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transition-delay: 0s;
    z-index: 1000;
    max-width: 600px;
    max-height: 500px;
    overflow-y: auto;
    min-width: 400px;
}

.post-card-match-context:hover .match-tooltip,
.match-tooltip:hover {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
    transition-delay: 0.5s;
}

.match-tooltip:hover {
    transition-delay: 0s;
}

.match-tooltip-header {
    font-weight: 700;
    color: var(--blog-accent);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--blog-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.tooltip-close {
    background: transparent;
    border: none;
    color: var(--blog-text-secondary);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.tooltip-close:hover {
    background: var(--blog-bg-secondary);
    color: var(--blog-accent);
}

.match-tooltip-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.match-tooltip-item {
    display: flex;
    gap: 0.5rem;
    line-height: 1.5;
    padding: 0.5rem;
    background: var(--blog-bg-secondary);
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.match-tooltip-item:hover {
    background: var(--blog-bg-tertiary);
}

.match-tooltip::-webkit-scrollbar {
    width: 6px;
}

.match-tooltip::-webkit-scrollbar-track {
    background: var(--blog-bg-secondary);
    border-radius: 3px;
}

.match-tooltip::-webkit-scrollbar-thumb {
    background: var(--blog-accent);
    border-radius: 3px;
}

.match-tooltip::-webkit-scrollbar-thumb:hover {
    background: var(--blog-primary);
}

/* Blog Navigation */
.blog-top-nav,
.post-top-nav {
    flex-shrink: 0;
}

.blog-top-nav .nav-menu,
.post-top-nav .nav-menu {
    display: flex;
    gap: 0.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.blog-top-nav .nav-menu li,
.post-top-nav .nav-menu li {
    margin: 0;
}

.blog-top-nav .nav-menu a,
.post-top-nav .nav-menu a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--blog-radius);
    background: var(--blog-bg-secondary);
    border: 1px solid var(--blog-border);
    transition: all var(--blog-transition);
    text-decoration: none;
    color: var(--blog-text-primary);
}

.blog-top-nav .nav-menu a:visited,
.post-top-nav .nav-menu a:visited {
    color: var(--blog-text-primary);
}

.blog-top-nav .nav-menu a:hover,
.post-top-nav .nav-menu a:hover {
    background: var(--blog-primary);
    border-color: var(--blog-primary);
    transform: translateY(-2px);
    color: white;
}

.blog-top-nav .nav-icon,
.post-top-nav .nav-icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: none;
}

.blog-top-nav .nav-icon path,
.post-top-nav .nav-icon path {
    fill: currentColor;
}

.blog-top-nav .nav-menu a:hover .nav-icon,
.post-top-nav .nav-menu a:hover .nav-icon {
    stroke: white;
    color: white;
}

.blog-top-nav .nav-menu a:hover .nav-icon path,
.post-top-nav .nav-menu a:hover .nav-icon path {
    fill: white;
}

.post-top-nav {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--blog-border);
}

/* ============================================
   Content Area
   ============================================ */
.blog-content {
    padding: 2rem;
    flex: 1;
    width: 100%;
    box-sizing: border-box;
}

/* Post List */
.post-list-header {
    margin-bottom: 2rem;
}

.post-list-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--blog-text-primary);
    margin: 0 0 0.5rem 0;
}

.post-list-header .post-count {
    display: inline-block;
    font-size: 1rem;
    color: var(--blog-text-secondary);
    background: transparent;
    padding: 0;
    margin: 0;
}

.post-list-header .subcategories-list {
    font-size: 0.9375rem;
    color: var(--blog-text-muted);
    margin: 0.75rem 0 0 0;
    font-style: italic;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(550px, 1fr));
    gap: 2rem;
    max-width: 100%;
}

/* Post Cards */
.post-card {
    background: var(--blog-bg-primary);
    border-radius: var(--blog-radius-lg);
    border: 1px solid var(--blog-border);
    overflow: hidden;
    transition: all var(--blog-transition);
    height: 100%;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px var(--blog-shadow-hover);
    border-color: var(--blog-primary);
}

.post-card-link {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
}

.post-card-header {
    margin-bottom: 0.75rem;
}

.post-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--blog-text-primary);
    margin: 0 0 0.5rem 0;
    line-height: 1.4;
}

.post-card-date {
    font-size: 0.875rem;
    color: var(--blog-text-muted);
}

.post-card-summary {
    flex: 1;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--blog-text-secondary);
    margin: 0 0 1rem 0;
}

.post-card-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--blog-border);
}

.post-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--blog-bg-secondary);
    color: var(--blog-text-secondary);
    border-radius: 4px;
    font-size: 0.8125rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--blog-transition);
    text-decoration: none;
}

.tag:hover {
    background: var(--blog-primary);
    color: white;
    border-color: var(--blog-primary);
    transform: translateY(-1px);
}

.tag:active {
    transform: translateY(0);
}

.tag:focus {
    outline: 2px solid var(--blog-primary);
    outline-offset: 2px;
}

.tag-more {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--blog-bg-tertiary);
    color: var(--blog-text-muted);
    border-radius: 4px;
    font-size: 0.8125rem;
}

/* ============================================
   Individual Post Page
   ============================================ */
.post-layout {
    min-height: 100vh;
    background: var(--blog-bg-secondary);
}

.post-container,
.post-main {
    max-width: 100%;
    margin: 0;
    margin-left: var(--sidebar-width);
    padding: 2rem 1.5rem;
    min-width: 0; /* Allow flexbox to shrink */
    overflow-x: hidden; /* Prevent horizontal overflow */
}

.blog-post {
    background: var(--blog-bg-primary);
    border-radius: var(--blog-radius-lg);
    padding: 2rem;
    box-shadow: 0 4px 12px var(--blog-shadow);
    max-width: 1200px;
    margin: 0 auto;
    width: auto;
    box-sizing: border-box;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    margin-bottom: 2rem;
    background: var(--blog-bg-secondary);
    border: 1px solid var(--blog-border);
    border-radius: var(--blog-radius);
    color: var(--blog-text-secondary);
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all var(--blog-transition);
}

.back-button:hover {
    background: var(--blog-primary);
    color: white;
    border-color: var(--blog-primary);
}

.post-header {
    position: relative;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    padding-right: 180px;
    border-bottom: 2px solid var(--blog-border);
}

.post-meta-top {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9375rem;
    color: var(--blog-text-muted);
}

.post-category {
    color: var(--blog-primary);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--blog-transition);
    cursor: pointer;
}

.post-category:hover {
    text-decoration: underline;
    opacity: 0.8;
}

.post-subcategory {
    color: var(--blog-text-secondary);
    text-decoration: none;
    transition: all var(--blog-transition);
    cursor: pointer;
}

.post-subcategory:hover {
    color: var(--blog-primary);
    text-decoration: underline;
}

.post-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--blog-text-primary);
    margin: 0 0 1rem 0;
}

.post-date {
    display: block;
    font-size: 1rem;
    color: var(--blog-text-muted);
    margin-bottom: 1rem;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.post-tags .tag {
    background: var(--blog-bg-secondary);
    color: var(--blog-primary);
    font-weight: 500;
}

/* ============================================
   Search Match Highlighting in Post Content
   ============================================ */
.search-match-highlight {
    background: rgba(255, 102, 0, 0.25);
    color: var(--blog-accent);
    font-weight: 600;
    padding: 2px 4px;
    border-radius: 3px;
    box-shadow: 0 0 0 2px rgba(255, 102, 0, 0.1);
    transition: all 0.3s ease;
}

.search-match-highlight.hidden {
    background: transparent;
    color: inherit;
    font-weight: inherit;
    padding: 0;
    box-shadow: none;
}

.search-match-highlight.first-match {
    animation: pulse-highlight 2s ease-in-out;
}

/* Highlight Toggle Button */
.highlight-toggle-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--blog-accent);
    color: white;
    border: none;
    border-radius: var(--blog-radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(255, 102, 0, 0.3);
    transition: all 0.3s ease;
}

.highlight-toggle-button:hover {
    background: var(--blog-primary);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.4);
    transform: translateY(-2px);
}

.highlight-toggle-button:active {
    transform: translateY(0);
}

.highlight-toggle-button.highlights-hidden {
    background: var(--blog-text-secondary);
}

.highlight-toggle-button.highlights-hidden:hover {
    background: var(--blog-text-primary);
}

.highlight-toggle-button .toggle-icon {
    flex-shrink: 0;
}

.highlight-toggle-button .toggle-text {
    white-space: nowrap;
}

@keyframes pulse-highlight {
    0%, 100% {
        background: rgba(255, 102, 0, 0.25);
        box-shadow: 0 0 0 2px rgba(255, 102, 0, 0.1);
    }
    50% {
        background: rgba(255, 102, 0, 0.5);
        box-shadow: 0 0 0 4px rgba(255, 102, 0, 0.3);
    }
}

/* ============================================
   Prose Styles (Article Content)
   ============================================ */
.prose {
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--blog-text-primary);
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--blog-text-primary);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.prose h1 {
    font-size: 2.25rem;
    background: linear-gradient(135deg, rgba(255, 102, 0, 0.12) 0%, rgba(0, 204, 255, 0.08) 100%);
    padding: 1.25rem 1.5rem;
    border-left: 5px solid var(--blog-accent);
    border-radius: 6px;
    margin-bottom: 1.5rem;
    font-weight: 700;
    font-family: 'Space Mono', 'JetBrains Mono', monospace;
    color: var(--blog-accent);
    letter-spacing: 0.5px;
    transition: all var(--blog-transition);
}

.prose h1:hover {
    background: linear-gradient(135deg, rgba(255, 102, 0, 0.16) 0%, rgba(0, 204, 255, 0.12) 100%);
    border-left-color: var(--blog-secondary);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(255, 102, 0, 0.1);
}

.prose h2 {
    font-size: 1.875rem;
    background: linear-gradient(135deg, rgba(0, 204, 255, 0.12) 0%, rgba(0, 102, 204, 0.08) 100%);
    padding: 1rem 1.25rem;
    border-left: 4px solid var(--blog-secondary);
    border-radius: 5px;
    margin-top: 2.5rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
    font-family: 'Space Mono', 'JetBrains Mono', monospace;
    color: var(--blog-primary);
    letter-spacing: 0.3px;
    transition: all var(--blog-transition);
}

.prose h2:hover {
    background: linear-gradient(135deg, rgba(0, 204, 255, 0.16) 0%, rgba(0, 102, 204, 0.12) 100%);
    border-left-color: var(--blog-accent);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0, 204, 255, 0.1);
}

.prose h3 {
    font-size: 1.5rem;
    display: inline-block;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.2) 0%, rgba(0, 204, 255, 0.15) 100%);
    padding: 0.5rem 1rem;
    border-left: 4px solid var(--blog-secondary);
    border-radius: 4px;
    margin-top: 2rem;
    margin-bottom: 1.25rem;
    font-weight: 600;
    font-family: 'Space Mono', 'JetBrains Mono', monospace;
    color: var(--blog-primary);
    transition: all var(--blog-transition);
}

.prose h3:hover {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.3) 0%, rgba(0, 204, 255, 0.25) 100%);
    border-left-color: var(--blog-accent);
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0, 204, 255, 0.15);
}

.prose h4 {
    font-size: 1.25rem;
    background: linear-gradient(135deg, rgba(255, 102, 0, 0.08) 0%, rgba(255, 102, 0, 0.03) 100%);
    padding: 0.5rem 1rem;
    border-left: 3px solid var(--blog-accent);
    border-radius: 3px;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    font-family: 'Space Mono', 'JetBrains Mono', monospace;
    color: var(--blog-accent);
    transition: all var(--blog-transition);
}

.prose h4:hover {
    background: linear-gradient(135deg, rgba(255, 102, 0, 0.12) 0%, rgba(255, 102, 0, 0.06) 100%);
    border-left-color: var(--blog-secondary);
    transform: translateX(3px);
}

.prose p {
    margin: 1.25rem 0;
}

.prose a {
    color: var(--blog-secondary);
    background: linear-gradient(to bottom, transparent 65%, var(--blog-secondary) 65%);
    background-size: 100% 2px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    text-decoration: none;
    font-weight: 600;
    font-family: 'Space Mono', 'JetBrains Mono', monospace;
    transition: all var(--blog-transition);
    border-radius: 2px;
    padding: 0 3px;
    letter-spacing: 0.3px;
}

.prose a:hover {
    color: var(--blog-accent);
    background: linear-gradient(to bottom, transparent 65%, var(--blog-accent) 65%);
    background-size: 100% 3px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    box-shadow: 0 2px 6px rgba(255, 102, 0, 0.2);
}

.prose a:active {
    background: linear-gradient(to bottom, transparent 65%, var(--blog-accent) 65%);
    background-size: 100% 3px;
}

/* YouTube link badges with SVG icon */
.prose a[href*="youtube.com"]::before,
.prose a[href*="youtu.be"]::before {
    content: "";
    display: inline-block;
    width: 1.1em;
    height: 1.1em;
    margin-right: 0.35rem;
    vertical-align: -0.15em;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="rgb(0, 204, 255)"><path stroke-linecap="round" stroke-linejoin="round" d="m15.75 10.5 4.72-4.72a.75.75 0 0 1 1.28.53v11.38a.75.75 0 0 1-1.28.53l-4.72-4.72M4.5 18.75h9a2.25 2.25 0 0 0 2.25-2.25v-9a2.25 2.25 0 0 0-2.25-2.25h-9A2.25 2.25 0 0 0 2.25 7.5v9a2.25 2.25 0 0 0 2.25 2.25Z" /></svg>');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    transition: transform var(--blog-transition);
}

.prose a[href*="youtube.com"]:hover::before,
.prose a[href*="youtu.be"]:hover::before {
    transform: scale(1.2);
}

.prose strong {
    font-weight: 600;
    color: var(--blog-text-primary);
}

.prose ul,
.prose ol {
    margin: 1.25rem 0;
    padding-left: 2rem;
}

.prose li {
    margin: 0.5rem 0;
    font-family: 'JetBrains Mono', 'Space Mono', monospace;
    color: var(--blog-text-secondary);
    line-height: 1.6;
}

.prose blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--blog-primary);
    background: var(--blog-bg-secondary);
    border-radius: 0 var(--blog-radius) var(--blog-radius) 0;
    font-style: italic;
    color: var(--blog-text-secondary);
}

.prose img {
    max-width: 100%;
    height: auto;
    border-radius: var(--blog-radius);
    margin: 2rem 0;
}

.prose table {
    width: 100%;
    margin: 2rem 0;
    border-collapse: collapse;
}

.prose th,
.prose td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--blog-border);
    text-align: left;
}

.prose th {
    background: var(--blog-bg-secondary);
    font-weight: 600;
}

.prose hr {
    margin: 3rem 0;
    border: none;
    border-top: 2px solid var(--blog-border);
}

/* Code Blocks */
.prose pre {
    position: relative;
    margin: 1.5rem 0;
    padding: 1.25rem;
    background: #2d2d2d;
    border-radius: var(--blog-radius);
    overflow-x: auto;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.prose code {
    font-family: 'Courier New', Courier, monospace;
}

.prose :not(pre) > code {
    padding: 0.125rem 0.375rem;
    background: var(--blog-bg-secondary);
    color: var(--blog-accent);
    border-radius: 4px;
    font-size: 0.9em;
}

.copy-button {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.375rem 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: white;
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--blog-transition);
}

.copy-button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.copy-button.copied {
    background: #4caf50;
    border-color: #4caf50;
}

/* Math (KaTeX) */
.prose .katex {
    font-size: 1.1em;
    max-width: 100%;
}

.prose .katex-display {
    margin: 2rem 0;
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
    padding: 0.5rem;
}

.prose .katex-display > .katex {
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
}

/* Mermaid Diagrams */
.prose .mermaid {
    margin: 2rem 0;
    text-align: center;
}

/* ============================================
   Welcome Message
   ============================================ */
.welcome-message {
    text-align: center;
    padding: 3rem 2rem;
}

.welcome-message h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--blog-text-primary);
    margin-bottom: 1rem;
}

.welcome-subtitle {
    font-size: 1.25rem;
    color: var(--blog-text-secondary);
    margin-bottom: 3rem;
}

.welcome-categories {
    margin: 3rem 0;
}

.welcome-categories h2 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--blog-text-primary);
}

.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 0 auto;
    max-width: 800px;
}

.category-card {
    background: var(--blog-bg-primary);
    padding: 2rem;
    border-radius: var(--blog-radius-lg);
    border: 2px solid var(--blog-border);
    transition: all var(--blog-transition);
    cursor: pointer;
    user-select: none;
}

.category-card:hover {
    border-color: var(--blog-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px var(--blog-shadow-hover);
}

.category-card:active {
    transform: translateY(-2px);
}

.category-card:focus {
    outline: 2px solid var(--blog-primary);
    outline-offset: 2px;
}

.category-card h3 {
    font-size: 1.5rem;
    margin: 0 0 0.5rem 0;
    color: var(--blog-primary);
}

.category-card > p {
    margin: 0.5rem 0;
    color: var(--blog-text-secondary);
}

.subcategories {
    font-size: 0.9375rem;
    color: var(--blog-text-muted) !important;
}

.welcome-action {
    margin-top: 3rem;
    font-size: 1.125rem;
    color: var(--blog-text-secondary);
}

/* ============================================
   States
   ============================================ */
.loading,
.error-message,
.no-posts {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--blog-text-secondary);
}

.error-message {
    color: var(--blog-accent);
}

.error-message h2 {
    color: var(--blog-accent);
    margin-bottom: 1rem;
}

/* ============================================
   Mobile Sidebar
   ============================================ */
.mobile-sidebar-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1000;
    width: 48px;
    height: 48px;
    background: var(--blog-bg-primary);
    border: 2px solid var(--blog-border);
    border-radius: var(--blog-radius);
    cursor: pointer;
    box-shadow: 0 2px 8px var(--blog-shadow);
}

.hamburger-icon {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    gap: 4px;
}

.hamburger-icon span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--blog-text-primary);
    transition: all var(--blog-transition);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--blog-transition), pointer-events var(--blog-transition);
}

.sidebar-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    /* Ensure no horizontal overflow */
    body {
        overflow-x: hidden;
        width: 100%;
        max-width: 100vw;
    }
    
    .mobile-sidebar-toggle {
        display: flex;
    }
    
    .sidebar-overlay {
        display: block;
    }
    
    .blog-layout {
        overflow-x: hidden;
        width: 100%;
        max-width: 100vw;
    }
    
    .blog-sidebar-container {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 999;
        transform: translateX(-100%);
        box-shadow: 2px 0 8px var(--blog-shadow);
    }
    
    .blog-sidebar-container.open {
        transform: translateX(0);
    }
    
    .blog-main,
    .post-main,
    .post-container {
        width: 100%;
        max-width: 100vw;
        margin-left: 0 !important;
        box-sizing: border-box;
    }
    
    .search-container {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-box {
        max-width: 100%;
    }
    
    .search-mode-toggle {
        width: 100%;
        justify-content: center;
    }
    
    .toggle-text {
        font-size: 0.8125rem;
    }
    
    .search-result-indicator {
        font-size: 0.8125rem;
        padding: 0.5rem 0.75rem;
    }
    
    .search-section-divider {
        flex-direction: column;
        gap: 1rem;
        margin: 2rem 0 1.5rem 0;
    }
    
    .divider-line {
        width: 100%;
        height: 1px;
    }
    
    .divider-label {
        padding: 0;
        width: 100%;
        text-align: center;
    }
    
    .divider-text {
        font-size: 0.8125rem;
    }
    
    .match-tooltip {
        max-width: 90vw;
        max-height: 80vh;
        min-width: 300px;
        padding: 0.875rem;
    }
    
    .post-card-match-context:hover .match-tooltip,
    .match-tooltip:hover {
        transform: translate(-50%, -50%) scale(1);
    }
    
    .match-tooltip-header {
        font-size: 0.875rem;
        flex-wrap: wrap;
    }
    
    .tooltip-close {
        position: sticky;
        top: 0;
    }
    
    .blog-top-nav .nav-menu,
    .post-top-nav .nav-menu {
        width: 100%;
        justify-content: center;
    }
    
    .blog-content {
        padding: 1rem;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .post-container {
        padding: 1.5rem 1rem;
    }
    
    .blog-post {
        padding: 1.5rem;
    }
    
    .post-title {
        font-size: 1.875rem;
    }
    
    .post-header {
        padding-right: 60px;
    }
    
    .highlight-toggle-button {
        position: absolute;
        top: 1rem;
        right: 0.5rem;
        padding: 0.625rem;
        border-radius: var(--blog-radius);
        min-width: auto;
    }
    
    .highlight-toggle-button .toggle-text {
        display: none;
    }
    
    .highlight-toggle-button .toggle-icon {
        width: 18px;
        height: 18px;
    }
    
    .welcome-message h1 {
        font-size: 1.875rem;
    }
    
    .category-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .post-title {
        font-size: 1.5rem;
    }
    
    .prose {
        font-size: 1rem;
    }
    
    .prose h2 {
        font-size: 1.5rem;
    }
    
    .prose h3 {
        font-size: 1.25rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .blog-sidebar-container,
    .search-container,
    .mobile-sidebar-toggle,
    .back-button,
    .copy-button,
    .post-tags {
        display: none !important;
    }
    
    .blog-post {
        box-shadow: none;
        padding: 0;
    }
}