/* ===================================
   CSS Variables - Color Palette
   =================================== */
: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;
}

/* ===================================
   Global Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    color: var(--dark-navy);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.25rem;
    color: var(--light-gray);
    line-height: 1.8;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    background-color: var(--dark-navy);
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    color: var(--white);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--off-white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-blue);
}

.nav-menu a.admin-link {
    color: var(--warning);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-navy) 100%);
    color: var(--white);
    padding: 4rem 0;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    color: var(--white);
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--off-white);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.profile-picture {
    width: 100%;
    max-width: 400px;
    height: 400px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    margin: 0 auto;
}

.profile-picture img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--light-navy);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-navy);
}

/* ===================================
   Sections
   =================================== */
section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--dark-navy);
}

/* Tabbed Section */
.tabbed-section {
    background-color: var(--white);
    padding: 0;
}

.tab-navigation {
    background-color: var(--dark-navy);
    display: flex;
    justify-content: center;
    gap: 0;
    position: sticky;
    top: 60px;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.tab-button {
    flex: 1;
    max-width: 250px;
    padding: 1.25rem 1.5rem;
    background-color: transparent;
    color: var(--off-white);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    position: relative;
}

.tab-button:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--white);
}

.tab-button.active {
    background-color: var(--primary-navy);
    color: var(--white);
    border-bottom: 3px solid var(--accent-blue);
}

.tab-content-wrapper {
    position: relative;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.tab-content.active {
    display: block;
}

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

/* About Section */
.about-section-content {
    padding: 4rem 0;
    background-color: var(--white);
}

.about-section {
    background-color: var(--white);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.about-card {
    padding: 2rem;
    background-color: var(--off-white);
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
}

.about-card h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
}

/* Skills Section */
.skills-section-content {
    padding: 4rem 0;
    background-color: var(--off-white);
}

.skills-section {
    background-color: var(--off-white);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.skill-category h3 {
    color: var(--primary-navy);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-blue);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: 0.5rem 0;
    color: var(--medium-gray);
    position: relative;
    padding-left: 1.5rem;
}

.skill-list li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

/* Education Section */
.education-section {
    background-color: var(--white);
}

.education-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.education-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--accent-blue);
}

.education-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3rem;
}

.education-marker {
    position: absolute;
    left: 12px;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--accent-blue);
    border: 3px solid var(--white);
    box-shadow: 0 0 0 2px var(--accent-blue);
}

.education-content h3 {
    color: var(--primary-navy);
    margin-bottom: 0.5rem;
}

.education-institution {
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-description {
    color: var(--light-gray);
}

/* Work Experience Section */
.experience-section-content {
    padding: 4rem 0;
    background-color: var(--off-white);
}

.experience-section {
    background-color: var(--off-white);
}

.experience-timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--accent-blue);
}

.experience-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3rem;
}

.experience-marker {
    position: absolute;
    left: 12px;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--accent-blue);
    border: 3px solid var(--off-white);
    box-shadow: 0 0 0 2px var(--accent-blue);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.experience-header h3 {
    color: var(--primary-navy);
    margin: 0;
    font-size: 1.25rem;
}

.experience-period {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.9rem;
}

.experience-company {
    color: var(--medium-gray);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.experience-highlights {
    list-style: none;
    margin-bottom: 1rem;
}

.experience-highlights li {
    padding: 0.35rem 0;
    padding-left: 1.5rem;
    color: var(--medium-gray);
    position: relative;
    line-height: 1.6;
}

.experience-highlights li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

.experience-tech {
    color: var(--light-gray);
    font-size: 0.9rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.experience-tech strong {
    color: var(--primary-navy);
}

/* Achievements Section */
.achievements-section-content {
    padding: 4rem 0;
    background-color: var(--off-white);
}

.achievements-section {
    background-color: var(--off-white);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.achievement-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.achievement-card.highlight {
    border: 2px solid var(--accent-blue);
    background: linear-gradient(135deg, var(--white) 0%, var(--off-white) 100%);
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.achievement-card h3 {
    color: var(--dark-navy);
    margin-bottom: 0.5rem;
}

.achievement-subtitle {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.achievement-card p {
    color: var(--medium-gray);
    line-height: 1.6;
}

/* Publications Section */
.publications-section {
    background-color: var(--white);
}

.section-intro {
    text-align: center;
    color: var(--light-gray);
    max-width: 700px;
    margin: -1rem auto 3rem;
    font-size: 1.125rem;
}

.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-item {
    background-color: var(--off-white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.publication-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.publication-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.publication-title a {
    color: var(--dark-navy);
    text-decoration: none;
    transition: color 0.3s ease;
}

.publication-title a:hover {
    color: var(--accent-blue);
}

.publication-authors {
    color: var(--medium-gray);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.publication-venue {
    color: var(--light-gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.venue-name {
    color: var(--accent-blue);
    font-weight: 600;
}

.publication-year {
    color: var(--light-gray);
}

.publication-citations {
    color: var(--light-gray);
    font-style: italic;
}

.publication-abstract {
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.publication-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.pub-link {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--white);
    color: var(--primary-navy);
    text-decoration: none;
    border-radius: 5px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.pub-link:hover {
    background-color: var(--accent-blue);
    color: var(--white);
    border-color: var(--accent-blue);
}

/* Publications Page */
.publications-header {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-navy) 100%);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

.publications-header h1 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.publications-subtitle {
    font-size: 1.125rem;
    color: var(--off-white);
}

.publications-content {
    background-color: var(--white);
    padding: 4rem 0;
}

.section-divider {
    max-width: 800px;
    margin: 4rem auto;
    height: 1px;
    background-color: var(--border-color);
}

.patents-section-content {
    margin-top: 3rem;
}

.patent-item {
    border-left-color: var(--success);
}

.publication-hidden,
.patent-hidden {
    display: none;
}

.view-all-container {
    text-align: center;
    margin-top: 2rem;
}

/* Xybern Page */
.xybern-header {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-navy) 100%);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

.xybern-header h1 {
    color: var(--white);
    font-size: 3rem;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.xybern-header-tagline {
    font-size: 1.25rem;
    color: var(--accent-blue);
}

.xybern-page-content {
    background-color: var(--white);
    padding: 4rem 0;
}

.xybern-intro {
    max-width: 800px;
    margin: 0 auto 3rem;
    text-align: center;
}

.xybern-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.xybern-feature-card {
    background-color: var(--off-white);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.xybern-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.xybern-feature-card .feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.xybern-feature-card h3 {
    color: var(--dark-navy);
    margin-bottom: 1rem;
}

.xybern-feature-card p {
    color: var(--medium-gray);
    line-height: 1.6;
}

.xybern-cta {
    max-width: 800px;
    margin: 4rem auto 0;
    text-align: center;
    padding: 3rem;
    background: linear-gradient(135deg, var(--primary-navy) 0%, var(--dark-navy) 100%);
    border-radius: 12px;
    color: var(--white);
}

.xybern-cta h2 {
    color: var(--white);
    margin-bottom: 1rem;
    font-size: 2rem;
}

.xybern-cta p {
    color: var(--off-white);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

/* Xybern Section */
.xybern-section {
    background: linear-gradient(135deg, var(--primary-navy) 0%, var(--dark-navy) 100%);
    color: var(--white);
}

.xybern-section .section-title {
    color: var(--white);
}

.xybern-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: start;
}

.xybern-brand {
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
}

.xybern-tagline {
    color: var(--off-white);
    font-style: italic;
}

.xybern-description .lead {
    color: var(--off-white);
    margin-bottom: 2rem;
}

.xybern-features {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.xybern-feature {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
}

.xybern-feature h4 {
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
}

.xybern-feature p {
    color: var(--off-white);
}

/* Featured Posts Section */
.featured-posts-inline {
    padding: 4rem 0 2rem;
    background-color: var(--off-white);
}

.featured-posts-section {
    background-color: var(--off-white);
}

.featured-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.featured-post-card {
    background-color: var(--white);
    padding: 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.featured-post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.featured-post-card .post-cover-image img {
    height: 200px;
}

.featured-post-card h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
}

.featured-post-card .post-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--light-gray);
    margin-bottom: 1rem;
    padding: 0 2rem;
    padding-top: 2rem;
}

.featured-post-card h3,
.featured-post-card .featured-excerpt,
.featured-post-card .read-more {
    padding: 0 2rem;
}

.featured-post-card .read-more {
    padding-bottom: 2rem;
    display: inline-block;
}

.featured-post-card p {
    color: var(--medium-gray);
    margin-bottom: 1rem;
}

.featured-excerpt p,
.featured-excerpt h1,
.featured-excerpt h2,
.featured-excerpt h3,
.featured-excerpt h4 {
    font-size: 1rem;
    font-weight: normal;
    color: var(--medium-gray);
    margin: 0.5rem 0;
    line-height: 1.6;
}

.featured-excerpt strong {
    font-weight: 600;
    color: var(--dark-navy);
}

.featured-excerpt em {
    font-style: italic;
}

.featured-excerpt hr {
    display: none;
}

.post-excerpt p,
.post-excerpt h1,
.post-excerpt h2,
.post-excerpt h3,
.post-excerpt h4 {
    font-size: 1rem;
    font-weight: normal;
    color: var(--medium-gray);
    margin: 0.5rem 0;
    line-height: 1.6;
}

.post-excerpt strong {
    font-weight: 600;
    color: var(--dark-navy);
}

.post-excerpt em {
    font-style: italic;
}

.post-excerpt hr {
    display: none;
}

.read-more {
    color: var(--accent-blue);
    font-weight: 600;
    text-decoration: none;
}

.read-more:hover {
    text-decoration: underline;
}

.text-center {
    text-align: center;
}

/* ===================================
   Blog Pages
   =================================== */
.blog-header {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-navy) 100%);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

.blog-header h1 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.blog-subtitle {
    font-size: 1.125rem;
    color: var(--off-white);
}

/* Category Tabs */
.category-tabs-section {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 60px;
    z-index: 100;
}

.category-tabs {
    display: flex;
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.category-tab {
    padding: 1rem 1.5rem;
    color: var(--medium-gray);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-tab:hover {
    color: var(--dark-navy);
    background-color: var(--off-white);
}

.category-tab.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
    background-color: var(--off-white);
}

.category-count {
    background-color: var(--light-gray);
    color: var(--white);
    padding: 0.125rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.category-tab.active .category-count {
    background-color: var(--accent-blue);
}

.blog-content {
    background-color: var(--white);
    padding: 4rem 0;
}

.blog-posts {
    max-width: 900px;
    margin: 0 auto;
}

.blog-post-card {
    background-color: var(--white);
    padding: 0;
    margin-bottom: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
    overflow: hidden;
}

.blog-post-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.post-cover-image {
    width: 100%;
    overflow: hidden;
    background-color: var(--off-white);
}

.post-cover-image a {
    display: block;
}

.post-cover-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.post-cover-image:hover img {
    transform: scale(1.05);
}

.blog-post-card .post-header,
.blog-post-card .post-excerpt,
.blog-post-card .read-more-link {
    padding: 0 2rem;
}

.blog-post-card .post-header {
    padding-top: 2rem;
}

.blog-post-card .read-more-link {
    padding-bottom: 2rem;
    display: inline-block;
}

.blog-post-card h2 a {
    color: var(--dark-navy);
    text-decoration: none;
    transition: color 0.3s ease;
}

.blog-post-card h2 a:hover {
    color: var(--accent-blue);
}

.post-meta {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.875rem;
    color: var(--light-gray);
    margin: 0.5rem 0 1rem 0;
}

.post-separator {
    color: var(--border-color);
}

.post-badge {
    background-color: var(--accent-blue);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.post-excerpt {
    margin: 1.5rem 0;
}

.read-more-link {
    color: var(--accent-blue);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.read-more-link:hover {
    text-decoration: underline;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 3rem;
}

.pagination-link,
.pagination-number {
    padding: 0.5rem 1rem;
    color: var(--primary-navy);
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.pagination-link:hover,
.pagination-number:hover {
    background-color: var(--off-white);
}

.pagination-current {
    padding: 0.5rem 1rem;
    background-color: var(--accent-blue);
    color: var(--white);
    border-radius: 5px;
    font-weight: 600;
}

.pagination-numbers {
    display: flex;
    gap: 0.5rem;
}

.no-posts {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--light-gray);
}

/* Individual Blog Post */
.blog-post {
    background-color: var(--white);
    padding: 4rem 0;
}

.post-header-full {
    max-width: 800px;
    margin: 0 auto 2rem;
    text-align: center;
}

.post-header-full h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.post-meta-full {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.875rem;
    color: var(--light-gray);
}

.post-video {
    max-width: 800px;
    margin: 2rem auto;
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    background-color: var(--dark-gray);
}

.post-video iframe,
.post-video video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.post-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--medium-gray);
}

.post-content h2,
.post-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

.post-content a {
    color: var(--accent-blue);
    text-decoration: none;
    border-bottom: 1px solid var(--accent-blue);
}

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

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.post-content code {
    background-color: var(--off-white);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    color: var(--primary-navy);
}

.post-content pre {
    background-color: var(--dark-gray);
    color: var(--off-white);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.post-content pre code {
    background-color: transparent;
    padding: 0;
    color: var(--off-white);
    font-size: 0.95em;
}

.post-content blockquote {
    border-left: 4px solid var(--accent-blue);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--light-gray);
    font-style: italic;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.post-content table th,
.post-content table td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
}

.post-content table th {
    background-color: var(--off-white);
    font-weight: 600;
    color: var(--dark-navy);
}

.post-content table tr:nth-child(even) {
    background-color: var(--off-white);
}

.post-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

.post-footer {
    max-width: 800px;
    margin: 4rem auto 0;
    padding-top: 2rem;
    text-align: center;
}

.back-to-blog {
    display: inline-block;
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--accent-blue);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.back-to-blog:hover {
    background-color: var(--accent-blue);
    color: var(--white);
}

.back-to-blog:hover {
    text-decoration: underline;
}

/* Related Posts */
.related-posts {
    background-color: var(--off-white);
    padding: 4rem 0;
}

.related-posts h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.related-post-card {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.related-post-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.related-post-card h3 a {
    color: var(--primary-navy);
    text-decoration: none;
}

.related-post-card h3 a:hover {
    color: var(--accent-blue);
}

.related-post-meta {
    font-size: 0.875rem;
    color: var(--light-gray);
    margin-bottom: 0.5rem;
}

/* ===================================
   Admin Pages
   =================================== */
.admin-header {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-navy) 100%);
    color: var(--white);
    padding: 2rem 0;
}

.admin-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header h1 {
    color: var(--white);
    margin: 0;
}

.admin-content {
    background-color: var(--white);
    padding: 3rem 0;
    min-height: 400px;
}

.admin-posts-table {
    overflow-x: auto;
}

.admin-posts-table table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.admin-posts-table th,
.admin-posts-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.admin-posts-table th {
    background-color: var(--off-white);
    color: var(--dark-navy);
    font-weight: 600;
}

.admin-posts-table tr:hover {
    background-color: var(--off-white);
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border-radius: 4px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-view {
    background-color: var(--accent-blue);
    color: var(--white);
}

.btn-edit {
    background-color: var(--warning);
    color: var(--white);
}

.btn-delete {
    background-color: var(--error);
    color: var(--white);
}

.btn-small:hover {
    opacity: 0.8;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}

.badge-published {
    background-color: var(--success);
    color: var(--white);
}

.badge-draft {
    background-color: var(--light-gray);
    color: var(--white);
}

.badge-featured {
    background-color: var(--accent-blue);
    color: var(--white);
    margin-left: 0.5rem;
}

.no-posts-admin {
    text-align: center;
    padding: 4rem 2rem;
}

/* Admin Forms */
.admin-form-section {
    background-color: var(--white);
    padding: 3rem 0;
}

.admin-form {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--off-white);
    padding: 2rem;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--dark-navy);
    margin-bottom: 0.5rem;
}

.form-help {
    display: block;
    font-size: 0.875rem;
    color: var(--light-gray);
    margin-top: 0.25rem;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

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

.form-textarea {
    resize: vertical;
}

.is-invalid {
    border-color: var(--error);
}

.form-error {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-group-inline {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.form-check {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.form-checkbox {
    width: auto;
    margin-right: 0.5rem;
}

.form-check-label {
    display: flex;
    align-items: center;
    font-weight: 500;
    color: var(--dark-navy);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.post-info {
    max-width: 800px;
    margin: 2rem auto 0;
    padding: 1rem;
    background-color: var(--off-white);
    border-radius: 5px;
    font-size: 0.875rem;
    color: var(--medium-gray);
}

.post-info p {
    margin-bottom: 0.5rem;
}

/* ===================================
   Flash Messages
   =================================== */
.flash-messages {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    z-index: 999;
}

.flash-message {
    padding: 1rem;
    transition: opacity 0.3s ease;
}

.flash-success {
    background-color: var(--success);
    color: var(--white);
}

.flash-error {
    background-color: var(--error);
    color: var(--white);
}

.flash-warning {
    background-color: var(--warning);
    color: var(--white);
}

.flash-message .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flash-close {
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===================================
   Error Pages
   =================================== */
.error-page {
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
}

.error-content {
    text-align: center;
}

.error-code {
    font-size: 6rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.error-content h2 {
    margin-bottom: 1rem;
}

.error-content p {
    color: var(--light-gray);
    margin-bottom: 2rem;
}

.error-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* ===================================
   Social Share Buttons
   =================================== */
.social-share {
    max-width: 800px;
    margin: 3rem auto;
    padding: 2rem;
    background-color: var(--off-white);
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
}

.social-share h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--dark-navy);
}

.share-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.share-twitter {
    background-color: #000000;
    color: var(--white);
}

.share-twitter:hover {
    background-color: #333333;
    transform: translateY(-2px);
}

.share-linkedin {
    background-color: #0077b5;
    color: var(--white);
}

.share-linkedin:hover {
    background-color: #006399;
    transform: translateY(-2px);
}

/* ===================================
   Portfolio Page
   =================================== */
.portfolio-header {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-navy) 100%);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

.portfolio-header h1 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.portfolio-subtitle {
    font-size: 1.125rem;
    color: var(--off-white);
}

.portfolio-content {
    background-color: var(--white);
    padding: 4rem 0;
}

.portfolio-section {
    margin-bottom: 4rem;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background-color: var(--off-white);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.featured-project {
    border-left-color: #f59e0b;
    background: linear-gradient(135deg, var(--off-white) 0%, var(--white) 100%);
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.project-card h3 {
    color: var(--dark-navy);
    margin-bottom: 0.5rem;
}

.project-meta {
    color: var(--light-gray);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.project-description {
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background-color: var(--white);
    color: var(--primary-navy);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    color: var(--accent-blue);
    font-weight: 600;
    text-decoration: none;
}

.project-link:hover {
    text-decoration: underline;
}

/* Repositories Grid */
.repositories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.repo-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.repo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.repo-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.repo-header h3 {
    color: var(--dark-navy);
    margin: 0;
}

.repo-description {
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.repo-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.repo-status {
    color: var(--light-gray);
    font-size: 0.875rem;
    font-style: italic;
}

/* Talks Grid */
.talks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.talk-card {
    background-color: var(--off-white);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--success);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.talk-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.talk-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.talk-card h3 {
    color: var(--dark-navy);
    margin-bottom: 0.5rem;
}

.talk-meta {
    color: var(--light-gray);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.talk-description {
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.talk-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Media Grid */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.media-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.media-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.media-type {
    display: inline-block;
    background-color: var(--accent-blue);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.media-card h3 {
    color: var(--dark-navy);
    margin-bottom: 0.5rem;
}

.media-source {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.media-description {
    color: var(--medium-gray);
    line-height: 1.6;
}

/* Demos Grid */
.demos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.demo-card {
    background-color: var(--off-white);
    padding: 2rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.demo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.featured-demo {
    border-color: var(--accent-blue);
    background: linear-gradient(135deg, var(--white) 0%, var(--off-white) 100%);
}

.demo-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--success);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.demo-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.demo-card h3 {
    color: var(--dark-navy);
    margin-bottom: 1rem;
}

.demo-description {
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.demo-button {
    width: 100%;
}

.demo-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Portfolio CTA */
.portfolio-cta {
    background: linear-gradient(135deg, var(--primary-navy) 0%, var(--dark-navy) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.portfolio-cta h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.portfolio-cta p {
    color: var(--off-white);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   Footer
   =================================== */
footer {
    background-color: var(--dark-navy);
    color: var(--off-white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--off-white);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--off-white);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--accent-blue);
}

/* Newsletter Section in Footer */
.newsletter-section {
    max-width: 350px;
}

.newsletter-form {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.newsletter-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.875rem;
    background-color: var(--white);
    color: var(--dark-navy);
}

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

.newsletter-btn {
    padding: 0.75rem 1.25rem;
    background-color: var(--accent-blue);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.newsletter-message {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    padding: 0.5rem;
    border-radius: 4px;
}

.newsletter-message.success {
    background-color: var(--success);
    color: var(--white);
}

.newsletter-message.error {
    background-color: var(--error);
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--light-gray);
    margin: 0;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .xybern-content {
        grid-template-columns: 1fr;
    }

    .xybern-logo {
        text-align: center;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .admin-header .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .admin-posts-table {
        font-size: 0.875rem;
    }

    .form-group-inline {
        flex-direction: column;
        gap: 1rem;
    }

    .error-code {
        font-size: 4rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
}