/* ===================================
   Dark Mode Styles
   =================================== */

/* CSS Variables for Dark Mode */
:root {
    --primary-navy: #1e3a5f;
    --dark-navy: #0f1c2e;
    --light-navy: #2c5282;
    --accent-blue: #3b82f6;
    --black: #000000;
    --dark-gray: #1a2332;
    --medium-gray: #374151;
    --light-gray: #6b7280;
    --off-white: #f9fafb;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Dark mode defaults */
    --bg-primary: var(--white);
    --bg-secondary: var(--off-white);
    --bg-tertiary: #f3f4f6;
    --text-primary: var(--dark-navy);
    --text-secondary: var(--medium-gray);
    --text-tertiary: var(--light-gray);
    --card-bg: var(--white);
    --code-bg: var(--dark-gray);
    --code-text: var(--off-white);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --border: var(--border-color);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #0f1419;
    --bg-secondary: #151b23;
    --bg-tertiary: #1c2128;
    --text-primary: #e6edf3;
    --text-secondary: #b4bcd0;
    --text-tertiary: #6e7681;
    --card-bg: #161b22;
    --code-bg: #0d1117;
    --code-text: #e6edf3;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --border: #30363d;
    
    --primary-navy: #58a6ff;
    --dark-navy: #c9d1d9;
    --light-navy: #79c0ff;
    --accent-blue: #58a6ff;
    --medium-gray: #b4bcd0;
    --light-gray: #6e7681;
}

/* Apply dark mode to body and main containers */
[data-theme="dark"] body {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
}

[data-theme="dark"] .navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .nav-menu a {
    color: var(--text-secondary);
}

[data-theme="dark"] .nav-menu a:hover,
[data-theme="dark"] .nav-menu a.active {
    color: var(--accent-blue);
}

[data-theme="dark"] section {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .about-section,
[data-theme="dark"] .education-section,
[data-theme="dark"] .publications-section {
    background-color: var(--bg-secondary);
}

[data-theme="dark"] .skills-section,
[data-theme="dark"] .experience-section,
[data-theme="dark"] .achievements-section,
[data-theme="dark"] .achievements-section-content,
[data-theme="dark"] .featured-posts-section,
[data-theme="dark"] .related-posts {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .about-card,
[data-theme="dark"] .skill-category,
[data-theme="dark"] .achievement-card,
[data-theme="dark"] .featured-post-card,
[data-theme="dark"] .blog-post-card,
[data-theme="dark"] .related-post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
}

[data-theme="dark"] .post-cover-image {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .featured-post-card .post-cover-image {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .achievement-card.highlight {
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg-tertiary) 100%);
    border: 2px solid var(--accent-blue);
}

[data-theme="dark"] .skill-category h3,
[data-theme="dark"] .achievement-card h3,
[data-theme="dark"] .featured-post-card h3,
[data-theme="dark"] .blog-post-card h2 a,
[data-theme="dark"] .related-post-card h3 a {
    color: var(--text-primary);
}

[data-theme="dark"] .post-meta {
    color: var(--text-tertiary);
}

[data-theme="dark"] .post-separator {
    color: var(--text-tertiary);
}

[data-theme="dark"] .post-excerpt {
    color: var(--text-secondary);
}

[data-theme="dark"] .post-excerpt p {
    color: var(--text-secondary);
}

[data-theme="dark"] .read-more-link {
    color: var(--accent-blue);
}

[data-theme="dark"] .achievement-subtitle {
    color: var(--accent-blue);
}

[data-theme="dark"] .achievement-card p {
    color: var(--text-secondary);
}

[data-theme="dark"] .section-title,
[data-theme="dark"] h1, 
[data-theme="dark"] h2, 
[data-theme="dark"] h3, 
[data-theme="dark"] h4 {
    color: var(--text-primary);
}

[data-theme="dark"] .experience-content h3,
[data-theme="dark"] .education-content h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .experience-highlights li,
[data-theme="dark"] .skill-list li {
    color: var(--text-secondary);
}

[data-theme="dark"] .publication-item {
    background-color: var(--bg-tertiary);
    border-left-color: var(--accent-blue);
}

[data-theme="dark"] .publication-title a {
    color: var(--text-primary);
}

[data-theme="dark"] .experience-timeline::before,
[data-theme="dark"] .education-timeline::before {
    background-color: var(--accent-blue);
}

[data-theme="dark"] .category-tabs-section {
    background-color: var(--bg-secondary);
    border-bottom-color: var(--border);
}

[data-theme="dark"] .category-tab {
    color: var(--text-secondary);
}

[data-theme="dark"] .category-tab:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

[data-theme="dark"] .category-tab.active {
    color: var(--accent-blue);
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .category-count {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

[data-theme="dark"] .category-tab.active .category-count {
    background-color: var(--accent-blue);
    color: white;
}

[data-theme="dark"] .blog-content {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .blog-post {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .post-header-full h1 {
    color: var(--text-primary);
}

[data-theme="dark"] .post-meta-full {
    color: var(--text-tertiary);
}

[data-theme="dark"] .post-meta-full .reading-time {
    color: var(--text-tertiary);
}

[data-theme="dark"] .toc-container {
    background-color: var(--bg-tertiary);
    border-color: var(--border);
}

[data-theme="dark"] .toc-title {
    color: var(--text-primary);
}

[data-theme="dark"] .toc-list a {
    color: var(--text-secondary);
}

[data-theme="dark"] .toc-list a:hover {
    color: var(--accent-blue);
}

[data-theme="dark"] .post-content {
    color: var(--text-secondary);
}

[data-theme="dark"] .post-content h1,
[data-theme="dark"] .post-content h2,
[data-theme="dark"] .post-content h3,
[data-theme="dark"] .post-content h4,
[data-theme="dark"] .post-content h5,
[data-theme="dark"] .post-content h6 {
    color: var(--text-primary);
}

[data-theme="dark"] .post-content p {
    color: var(--text-secondary);
}

[data-theme="dark"] .post-content ul,
[data-theme="dark"] .post-content ol {
    color: var(--text-secondary);
}

[data-theme="dark"] .post-content li {
    color: var(--text-secondary);
}

[data-theme="dark"] .post-content strong,
[data-theme="dark"] .post-content b {
    color: var(--text-primary);
}

[data-theme="dark"] .post-content a {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

[data-theme="dark"] .post-content a:hover {
    color: var(--light-navy);
    border-bottom-color: var(--light-navy);
}

[data-theme="dark"] .post-content code {
    background-color: var(--bg-tertiary);
    color: var(--accent-blue);
}

[data-theme="dark"] .post-content pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border);
}

[data-theme="dark"] .post-content pre code {
    color: var(--code-text);
}

[data-theme="dark"] .post-content blockquote {
    border-left-color: var(--accent-blue);
    color: var(--text-tertiary);
}

[data-theme="dark"] .post-content table th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

[data-theme="dark"] .post-content table td {
    border-color: var(--border);
}

[data-theme="dark"] .post-content table tr:nth-child(even) {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .post-content hr {
    border-color: var(--border);
}

[data-theme="dark"] .related-posts h2 {
    color: var(--text-primary);
}

[data-theme="dark"] .related-post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
}

[data-theme="dark"] .related-post-card h3 a {
    color: var(--text-primary);
}

[data-theme="dark"] .related-post-meta {
    color: var(--text-tertiary);
}

[data-theme="dark"] .related-post-card p {
    color: var(--text-secondary);
}

[data-theme="dark"] .back-to-blog {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

[data-theme="dark"] .back-to-blog:hover {
    background-color: var(--accent-blue);
    color: white;
}

[data-theme="dark"] .social-share {
    background-color: var(--bg-tertiary);
    border-left-color: var(--accent-blue);
}

[data-theme="dark"] .social-share h3 {
    color: var(--text-primary);
}

[data-theme="dark"] footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

[data-theme="dark"] .footer-section h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .footer-section p,
[data-theme="dark"] .footer-section a {
    color: var(--text-secondary);
}

[data-theme="dark"] .footer-section a:hover {
    color: var(--accent-blue);
}

[data-theme="dark"] .newsletter-input {
    background-color: var(--bg-tertiary);
    border-color: var(--border);
    color: var(--text-primary);
}

[data-theme="dark"] .newsletter-input::placeholder {
    color: var(--text-tertiary);
}

[data-theme="dark"] .admin-content {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .admin-form {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-textarea {
    background-color: var(--bg-tertiary);
    border-color: var(--border);
    color: var(--text-primary);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-textarea:focus {
    border-color: var(--accent-blue);
}

[data-theme="dark"] .admin-posts-table table {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
}

[data-theme="dark"] .admin-posts-table th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

[data-theme="dark"] .admin-posts-table td {
    border-color: var(--border);
}

[data-theme="dark"] .admin-posts-table tr:hover {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .error-content h2 {
    color: var(--text-primary);
}

[data-theme="dark"] .xybern-feature-card,
[data-theme="dark"] .project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
}

[data-theme="dark"] .xybern-feature-card h3,
[data-theme="dark"] .project-card h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .xybern-feature-card p,
[data-theme="dark"] .project-card p {
    color: var(--text-secondary);
}

[data-theme="dark"] .xybern-cta {
    background: linear-gradient(135deg, #1e3a5f 0%, #0f1c2e 100%);
}

[data-theme="dark"] .repo-card {
    background-color: var(--card-bg);
    border-color: var(--border);
}

[data-theme="dark"] .repo-card h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .xybern-page-content,
[data-theme="dark"] .portfolio-content,
[data-theme="dark"] .publications-content {
    background-color: var(--bg-primary);
}

[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #0f1c2e 0%, #1e3a5f 100%);
}

[data-theme="dark"] .blog-header,
[data-theme="dark"] .admin-header,
[data-theme="dark"] .publications-header,
[data-theme="dark"] .portfolio-header,
[data-theme="dark"] .xybern-header {
    background: linear-gradient(135deg, #0f1c2e 0%, #1e3a5f 100%);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 2px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    margin-left: 1rem;
}

.theme-toggle:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    transform: scale(1.1);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* Reading Progress Bar */
.reading-progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: transparent;
    z-index: 1001;
}

.reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--light-navy));
    width: 0%;
    transition: width 0.1s ease;
}

/* Table of Contents */
.toc-container {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.toc-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.toc-list li {
    margin: 0.5rem 0;
}

.toc-list a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 0.25rem 0;
    transition: color 0.2s ease;
}

.toc-list a:hover {
    color: var(--accent-blue);
}

.toc-list .toc-h2 {
    font-weight: 500;
}

.toc-list .toc-h3 {
    padding-left: 1rem;
    font-size: 0.9rem;
}

/* Copy Code Button */
.code-block-wrapper {
    position: relative;
}

.copy-code-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    opacity: 0;
}

.code-block-wrapper:hover .copy-code-btn {
    opacity: 1;
}

.copy-code-btn:hover {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.copy-code-btn.copied {
    background-color: var(--success);
    border-color: var(--success);
    color: white;
}

/* Search Styles */
.search-container {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.search-form {
    display: flex;
    gap: 0.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

[data-theme="dark"] .search-input {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border);
}

[data-theme="dark"] .search-input::placeholder {
    color: var(--text-tertiary);
}

[data-theme="dark"] .no-posts {
    color: var(--text-tertiary);
}

[data-theme="dark"] .pagination-link,
[data-theme="dark"] .pagination-number {
    color: var(--text-secondary);
}

[data-theme="dark"] .pagination-link:hover,
[data-theme="dark"] .pagination-number:hover {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .pagination-current {
    background-color: var(--accent-blue);
    color: white;
}

.search-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-blue);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background-color: var(--light-navy);
}

[data-theme="dark"] .search-results-info {
    color: var(--text-tertiary);
}

[data-theme="dark"] .search-results-info strong {
    color: var(--text-primary);
}

[data-theme="dark"] .no-search-results {
    color: var(--text-tertiary);
}

[data-theme="dark"] .no-search-results h3 {
    color: var(--text-primary);
}

.search-results-info {
    text-align: center;
    color: var(--text-tertiary);
    margin-bottom: 2rem;
}

.no-search-results {
    text-align: center;
    padding: 3rem;
    color: var(--text-tertiary);
}

/* Tag Styles */
.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.875rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.tag:hover {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
    text-decoration: none;
}

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

/* Post Meta Enhancements */
.post-meta-full {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.reading-time {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Smooth scroll offset for fixed header */
html {
    scroll-padding-top: 80px;
}

/* Animation for theme transition */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Print styles */
@media print {
    .reading-progress-container,
    .theme-toggle,
    .copy-code-btn,
    .nav-menu,
    footer,
    .social-share {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}