/* ===========================
   CSS Variables & Reset
   =========================== */

/* Dark Theme (Default) */
:root,
[data-theme="dark"] {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;
    --accent-primary: #3b82f6;
    --accent-hover: #60a5fa;
    --border-color: #222222;
    --link-color: #60a5fa;
    --link-hover: #93c5fd;
    --code-bg: #1a1a1a;
    --toc-bg: #0f0f0f;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Typography */
    --font-family: 'Geist Mono', 'Monaco', 'Courier New', monospace;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.75;

    /* Effects */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

/* Light Theme */
[data-theme="light"] {
    /* Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a1a1a;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --accent-primary: #2563eb;
    --accent-hover: #1d4ed8;
    --border-color: #e2e8f0;
    --link-color: #2563eb;
    --link-hover: #1d4ed8;
    --code-bg: #f1f3f5;
    --toc-bg: #f8f9fa;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: var(--line-height-normal);
    font-weight: 600;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ===========================
   Responsive Typography
   =========================== */

/* Tablets and larger */
@media (min-width: 768px) {
    html {
        font-size: 16.5px;
    }
}

/* Laptops and desktops */
@media (min-width: 1024px) {
    html {
        font-size: 17px;
    }
}

/* Large desktops */
@media (min-width: 1440px) {
    html {
        font-size: 17.5px;
    }
}

/* Extra large screens */
@media (min-width: 1920px) {
    html {
        font-size: 18px;
    }
}

/* ===========================
   Layout
   =========================== */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
}

/* ===========================
   Header & Navigation
   =========================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);

    /* Full width - break out of container */
    margin-left: calc(-1 * var(--spacing-lg));
    margin-right: calc(-1 * var(--spacing-lg));
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-md) var(--spacing-lg);

    animation: fadeInDown 0.6s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

/* Header inner content constrained */
.header::before {
    content: '';
    max-width: 1200px;
    /* Match the new wider content standard */
    margin: 0 auto;
}

/* Light theme header background */
[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.95);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-md);
    font-weight: 600;
    transition: color var(--transition-normal);
    position: relative;
    padding-bottom: 4px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ===========================
   Theme Toggle Button
   =========================== */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.theme-icon {
    font-size: 1.2rem;
    line-height: 1;
    transition: transform var(--transition-normal);
}

.theme-toggle:hover .theme-icon {
    transform: rotate(20deg);
}


/* ===========================
   Hero Section
   =========================== */
.hero {
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    line-height: var(--line-height-tight);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    font-weight: 600;
    font-style: italic;
}

/* ===========================
   Bio Section
   =========================== */
.bio {
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.bio-section {
    margin-bottom: var(--spacing-lg);
}

.section-label {
    font-size: var(--font-size-md);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.bio-list {
    list-style: none;
    padding-left: 0;
}

.bio-list li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    padding-left: var(--spacing-md);
    position: relative;
    font-weight: 600;
}

.bio-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

/* ===========================
   Links & Buttons
   =========================== */
.inline-link {
    color: var(--link-color);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

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

.links-section {
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.quick-link {
    display: block;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
    text-align: center;
    font-weight: 600;
}

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

/* ===========================
   Social Links
   =========================== */
.social-section {
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.social-link:hover {
    background: var(--border-color);
    color: var(--text-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.social-icon {
    width: 18px;
    height: 18px;
}

/* ===========================
   Blog Styles
   =========================== */
.blog-grid {
    display: grid;
    gap: var(--spacing-lg);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.blog-card {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.blog-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.blog-card-header {
    margin-bottom: var(--spacing-md);
}

.blog-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.blog-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.blog-card-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

.blog-card-date,
.blog-card-reading-time {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.blog-card-excerpt {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.blog-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.blog-tag {
    padding: 4px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    font-weight: 600;
}

.blog-tag:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ===========================
   Blog Post Page
   =========================== */
.blog-post {
    animation: fadeInUp 0.6s ease 0.2s both;
}

.blog-post-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.blog-post-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-tight);
}

.blog-post-meta {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.blog-post-content {
    line-height: var(--line-height-relaxed);
}

.blog-post-content h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(100, 100, 100, 0.1) 0%, rgba(80, 80, 80, 0.05) 100%);
    border-left: 4px solid var(--accent-primary);
    border-radius: 8px;
    color: var(--text-primary);
}

.blog-post-content h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(59, 130, 246, 0.03) 100%);
    border-left: 3px solid var(--accent-primary);
    border-radius: 6px;
    color: var(--text-primary);
}

.blog-post-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(59, 130, 246, 0.04);
    border-left: 2px solid rgba(59, 130, 246, 0.3);
    border-radius: 4px;
    color: var(--text-primary);
}

.blog-post-content p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 600;
}

.blog-post-content a {
    color: var(--link-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.blog-post-content a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

.blog-post-content ul,
.blog-post-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
    font-weight: 600;
}

.blog-post-content li {
    margin-bottom: var(--spacing-sm);
}

.blog-post-content code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--accent-hover);
}

.blog-post-content pre {
    background: var(--code-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.blog-post-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.blog-post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: var(--spacing-lg) 0;
}

.blog-post-content blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* ===========================
   Blog Post Navigation
   =========================== */
.blog-post-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--border-color);
}

.blog-nav-link {
    flex: 1;
    max-width: 45%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.blog-nav-link:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.blog-nav-link.prev {
    justify-content: flex-start;
}

.blog-nav-link.next {
    justify-content: flex-end;
    margin-left: auto;
}

.blog-nav-icon {
    font-size: 1.5rem;
    color: var(--accent-primary);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
}

.blog-nav-link.prev:hover .blog-nav-icon {
    transform: translateX(-4px);
}

.blog-nav-link.next:hover .blog-nav-icon {
    transform: translateX(4px);
}

.blog-nav-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 0;
    /* Allow text truncation */
}

.blog-nav-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.blog-nav-title {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.blog-nav-link:hover .blog-nav-title {
    color: var(--accent-hover);
}

/* If only one navigation link exists */
.blog-post-navigation:has(.blog-nav-link:only-child) {
    justify-content: flex-start;
}

/* ===========================
   Table of Contents (TOC)
   =========================== */

/* Blog post page layout - 1200px Text Area with Slide-in TOC */
.blog-layout {
    display: flex;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.blog-main-content {
    max-width: 1200px;
    /* Your requested 1200px text area */
    width: 100%;
    flex: 1;
    /* Changed from flex: 0 1 auto to take full width */
}

.blog-post {
    animation: fadeInUp 0.6s ease 0.2s both;
}

.toc-wrapper {
    position: fixed;
    right: 0;
    top: 100px;
    width: 300px;
    max-height: calc(100vh - 120px);
    background: transparent;
    padding: var(--spacing-lg);
    padding-right: calc(var(--spacing-lg) + 20px);
    z-index: 100;
    transform: translateX(0);
    overflow-y: auto;
    border: none;
    outline: none;
    box-shadow: none;
}

.toc-sticky {
    border: none;
    outline: none;
}

.toc {
    background: transparent;
    border: none;
    outline: none;
    padding: 0;
    box-shadow: none;
}

.toc-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-left: 0;
    /* Remove left padding for cleaner look */
}

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

.toc-link {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1.6;
    padding: 0.5rem 0;
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
    padding-left: 0.75rem;
    margin-left: 0;
}

.toc-link:hover {
    color: var(--text-primary);
    border-left-color: var(--text-tertiary);
}

.toc-link.active {
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    font-weight: 500;
}

/* Custom scrollbar for TOC */
.toc::-webkit-scrollbar,
.toc-list::-webkit-scrollbar {
    width: 6px;
}

.toc::-webkit-scrollbar-track,
.toc-list::-webkit-scrollbar-track {
    background: transparent;
}

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

.toc::-webkit-scrollbar-thumb:hover,
.toc-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ===========================
   Projects Grid
   =========================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.project-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-primary);
}

.project-content {
    padding: var(--spacing-md);
}

.project-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
    font-weight: 600;
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
}

.project-link {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    font-weight: 600;
}

.project-link:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ===========================
   Footer
   =========================== */
.footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

/* ===========================
   Blog Filter System
   =========================== */

/* Hero Header with Filter Button */
.hero-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Filter Toggle Button */
.filter-toggle-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-toggle-btn:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.filter-icon {
    transition: transform var(--transition-normal);
}

.filter-toggle-btn:hover .filter-icon {
    transform: rotate(90deg);
}

/* Filter Panel (Right Side - Like TOC) */
.filter-panel {
    position: fixed;
    top: 100px;
    right: 0;
    width: 350px;
    max-height: calc(100vh - 120px);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: 12px 0 0 12px;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    z-index: 100;
    overflow-y: auto;
    padding: 0;
}

.filter-panel.active {
    transform: translateX(0);
}

/* Scrollbar styling for filter panel */
.filter-panel::-webkit-scrollbar {
    width: 8px;
}

.filter-panel::-webkit-scrollbar-track {
    background: transparent;
}

.filter-panel::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.filter-panel::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Filter Panel Header */
.filter-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 10;
    border-radius: 12px 0 0 0;
}

.filter-panel-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.filter-close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.filter-close-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Filter Panel Content */
.filter-panel-content {
    padding: var(--spacing-lg);
}

/* Overlay - visible on all screens when active */
.filter-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    z-index: 99;
    pointer-events: none;
}

.filter-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}


/* Legacy filter section - now hidden since we use panel */
.filter-section {
    display: none;
}

.filter-group {
    margin-bottom: var(--spacing-lg);
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

/* Category Checkboxes */
.category-filters {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.category-filter-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    user-select: none;
}

.category-filter {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: inline-block;
    position: relative;
    transition: all var(--transition-fast);
}

.category-filter:checked+.checkbox-custom {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.category-filter:checked+.checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.checkbox-label {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    font-weight: 500;
}

/* Tag Filter Buttons */
.tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag-filter-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-family);
}

.tag-filter-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.tag-filter-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.clear-btn {
    padding: 0.375rem 0.875rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.clear-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Posts Count */
.posts-count-section {
    margin-bottom: var(--spacing-md);
}

.posts-count {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

/* Category Badges on Cards */
.category-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.7rem;
    font-weight: 700;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-badge.tech {
    background: #3b82f6;
    color: white;
}

.category-badge.non-tech {
    background: #10b981;
    color: white;
}

.category-badge.general {
    background: #6b7280;
    color: white;
}

/* ===========================
   Project Tech Tags & Detail Page
   =========================== */
.project-tech {
    margin-bottom: var(--spacing-sm);
}

.tech-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-right: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

/* Project Detail Page */
.project-detail {
    max-width: 100%;
}

.project-detail-header {
    margin-bottom: var(--spacing-xl);
}

.project-detail-image {
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: var(--spacing-lg);
}

.project-detail-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-tight);
}

.project-detail-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-relaxed);
}

.project-detail-links {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.project-detail-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent-primary);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.project-detail-link:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.link-icon {
    width: 20px;
    height: 20px;
}

.project-detail-tech {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.project-detail-tech h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.project-detail-content {
    margin-bottom: var(--spacing-xl);
}

.project-detail-content h2 {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.project-detail-content h3 {
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.project-detail-content p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.project-detail-content ul,
.project-detail-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.project-detail-content li {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-xs);
}

.project-detail-content pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.project-detail-content code {
    font-family: 'Geist Mono', monospace;
    font-size: 0.9em;
    color: var(--text-primary);
}

.project-detail-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: var(--spacing-md) 0;
}

.project-detail-footer {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--accent-hover);
}

/* ===========================
   About Page Styles
   =========================== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.about-name {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.about-tagline {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.about-location {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.about-social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.about-social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-weight: 500;
}

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

.about-social-link .social-icon {
    width: 20px;
    height: 20px;
}

.about-body {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

.about-body h2 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.about-body h3 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.about-body h4 {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.about-body p {
    margin-bottom: var(--spacing-md);
}

.about-body ul,
.about-body ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.about-body li {
    margin-bottom: var(--spacing-xs);
}

.about-body a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.about-body a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

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

.about-body code {
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Geist Mono', monospace;
    font-size: 0.9em;
}

.about-body pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.about-body pre code {
    background: none;
    padding: 0;
}

.about-body blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.about-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--spacing-xl) 0;
}

/* ===========================
   Home Page Styles
   =========================== */
.home-hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    animation: fadeInUp 0.6s ease;
}

.home-name {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: var(--line-height-tight);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-title {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    font-style: italic;
    font-weight: 400;
}

.home-bio {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.1s both;
}

.home-bio p {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    max-width: 700px;
    margin: 0 auto;
}

.home-social-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.home-social-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-weight: 500;
    font-size: var(--font-size-md);
}

.home-social-btn:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.home-social-btn:active {
    transform: translateY(-1px);
}

.home-social-btn .social-icon {
    width: 22px;
    height: 22px;
    transition: transform var(--transition-normal);
}

.home-social-btn:hover .social-icon {
    transform: scale(1.1);
}

.home-content {
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.home-content h2 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.home-content h3 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

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

.home-content ul,
.home-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.home-content li {
    margin-bottom: var(--spacing-xs);
    line-height: var(--line-height-relaxed);
}

.home-content a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.home-content a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

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

.home-content code {
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Geist Mono', monospace;
    font-size: 0.9em;
    color: var(--accent-hover);
}

.home-content pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.home-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.home-content blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.home-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--spacing-xl) 0;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1200px) {

    /* Hide TOC when not enough space for outside positioning */
    .toc-wrapper {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.5rem;
        --spacing-2xl: 3rem;
    }

    .container {
        padding: var(--spacing-md);
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav {
        gap: var(--spacing-md);
        width: 100%;
    }

    .theme-toggle {
        width: 100%;
        justify-content: center;
    }

    .quick-links {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .social-links {
        flex-direction: column;
    }

    .social-link {
        justify-content: center;
    }

    /* Blog navigation responsive */
    .blog-post-navigation {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .blog-nav-link {
        max-width: 100%;
        width: 100%;
    }

    .blog-nav-link.next {
        margin-left: 0;
    }

    /* Home page responsive */
    .home-social-links {
        flex-direction: column;
        align-items: stretch;
    }

    .home-social-btn {
        justify-content: center;
    }

    /* Blog filter panel responsive */
    .hero-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .filter-toggle-btn {
        width: 100%;
        justify-content: center;
    }

    .filter-panel {
        width: 100%;
        max-width: 100%;
        top: 0;
        max-height: 100vh;
        border-radius: 0;
    }

    .filter-panel-header {
        border-radius: 0;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-3xl: 1.75rem;
        --spacing-xl: 2rem;
    }
}

/* ===========================
   Utility Classes
   =========================== */
.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.hidden {
    display: none;
}