/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
}

/* ==================== CONTAINER ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

@media (min-width: 768px) {
    .container {
        padding: 0 48px;
    }
}

/* ==================== NAVIGATION ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e5e5;
    z-index: 1000;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    padding-bottom: 16px;
}

.nav-brand a {
    font-size: 18px;
    font-weight: 600;
    color: #0066CC;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-brand a:hover {
    color: #003d7a;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-menu li a {
    text-decoration: none;
    color: #4a4a4a;
    font-weight: 400;
    font-size: 15px;
    transition: color 0.3s ease, transform 0.2s ease;
    display: inline-block;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: #0066CC;
    transform: translateY(-2px);
}

.btn-nav {
    padding: 8px 20px;
    background: #0066CC;
    color: #ffffff !important;
    border-radius: 6px;
    transition: background 0.3s ease, transform 0.2s ease;
}

.btn-nav:hover {
    background: #003d7a;
    transform: translateY(-2px) !important;
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #0066CC;
    border-radius: 2px;
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        right: -100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 70%;
        height: calc(100vh - 60px);
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 24px;
        gap: 24px;
        transition: right 0.3s ease;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        right: 0;
    }
}

/* ==================== HERO SECTION ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f8f9fc 0%, #ffffff 100%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-image {
    width: 180px;
    height: 180px;
    margin: 0 auto 32px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid #0066CC;
    box-shadow: 0 10px 40px rgba(0, 102, 204, 0.2);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero h1 {
    font-size: 48px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 20px;
    color: #0066CC;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-description {
    font-size: 18px;
    color: #4a4a4a;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.social-link {
    padding: 12px 24px;
    background: #ffffff;
    color: #0066CC;
    text-decoration: none;
    border-radius: 6px;
    border: 2px solid #0066CC;
    font-weight: 500;
    transition: background 0.3s ease, color 0.3s ease, transform 0.2s ease;
}

.social-link:hover {
    background: #0066CC;
    color: #ffffff;
    transform: translateY(-2px);
}

/* ==================== SECTIONS ==================== */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 36px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 48px;
    text-align: center;
    letter-spacing: -0.02em;
}

/* ==================== ABOUT SECTION ==================== */
.about {
    background: #ffffff;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    font-size: 17px;
    color: #4a4a4a;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.stat-card {
    background: linear-gradient(135deg, #0066CC 0%, #003d7a 100%);
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    color: #ffffff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 102, 204, 0.3);
}

.stat-card h3 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 8px;
}

.stat-card p {
    font-size: 15px;
    opacity: 0.95;
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: row;
        justify-content: space-around;
    }
}

/* ==================== RESEARCH INTERESTS ==================== */
.research-interests {
    background: #f8f9fc;
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.interest-card {
    background: #ffffff;
    padding: 32px;
    border-radius: 12px;
    border: 1px solid #e5e5e5;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.interest-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-color: #0066CC;
}

.interest-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.interest-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.interest-card p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
}

/* ==================== TIMELINE ==================== */
.highlights {
    background: #ffffff;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 80px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, #0066CC 0%, #003d7a 100%);
}

.timeline-item {
    display: flex;
    gap: 32px;
    margin-bottom: 48px;
    position: relative;
}

.timeline-date {
    min-width: 60px;
    font-weight: 600;
    color: #0066CC;
    font-size: 16px;
}

.timeline-content {
    flex: 1;
    background: #f8f9fc;
    padding: 24px;
    border-radius: 12px;
    border-left: 3px solid #0066CC;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-content:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0, 102, 204, 0.1);
}

.timeline-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .timeline::before {
        left: 50px;
    }

    .timeline-date {
        min-width: 40px;
        font-size: 14px;
    }
}

/* ==================== CTA SECTION ==================== */
.cta {
    background: linear-gradient(135deg, #0066CC 0%, #003d7a 100%);
    color: #ffffff;
    text-align: center;
    padding: 80px 0;
}

.cta h2 {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.95;
}

.btn-primary {
    display: inline-block;
    padding: 14px 32px;
    background: #ffffff;
    color: #0066CC;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.3);
}

/* ==================== PAGE HEADER ==================== */
.page-header {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #f8f9fc 0%, #ffffff 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.page-header p {
    font-size: 18px;
    color: #4a4a4a;
    margin-bottom: 24px;
}

/* ==================== PUBLICATIONS ==================== */
.thesis,
.publications {
    background: #ffffff;
}

.thesis-card {
    background: linear-gradient(135deg, #f8f9fc 0%, #ffffff 100%);
    padding: 40px;
    border-radius: 12px;
    border: 2px solid #0066CC;
    max-width: 900px;
    margin: 0 auto;
}

.thesis-year {
    display: inline-block;
    background: #0066CC;
    color: #ffffff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.thesis-card h3 {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
    line-height: 1.4;
}

.thesis-supervisor {
    color: #0066CC;
    font-weight: 500;
    margin-bottom: 20px;
}

.thesis-description {
    font-size: 16px;
    color: #4a4a4a;
    line-height: 1.7;
    margin-bottom: 24px;
}

.thesis-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.keyword {
    background: #0066CC;
    color: #ffffff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.publication-category {
    margin-bottom: 48px;
}

.category-title {
    font-size: 28px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 32px;
    padding-bottom: 12px;
    border-bottom: 2px solid #0066CC;
}

.publication-item {
    display: flex;
    gap: 32px;
    padding: 32px;
    background: #f8f9fc;
    border-radius: 12px;
    margin-bottom: 24px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.publication-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0, 102, 204, 0.1);
}

.pub-year {
    min-width: 60px;
    font-weight: 700;
    color: #0066CC;
    font-size: 18px;
}

.pub-content {
    flex: 1;
}

.pub-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
    line-height: 1.4;
}

.pub-authors {
    font-size: 15px;
    color: #4a4a4a;
    margin-bottom: 8px;
}

.pub-venue {
    font-size: 15px;
    color: #4a4a4a;
    font-style: italic;
    margin-bottom: 12px;
}

.pub-status {
    margin-bottom: 16px;
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
}

.status-badge.accepted {
    background: #e8f5e9;
    color: #2e7d32;
}

.status-badge.review {
    background: #fff3e0;
    color: #e65100;
}

.pub-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-small {
    padding: 8px 16px;
    background: #0066CC;
    color: #ffffff;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
}

.btn-small:hover {
    background: #003d7a;
    transform: translateY(-2px);
}

.bibtex-container {
    display: none;
    margin-top: 16px;
    background: #1a1a1a;
    color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
}

.bibtex-container.active {
    display: block;
}

.bibtex-container pre {
    font-size: 13px;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* ==================== RESEARCH THEMES ==================== */
.research-themes {
    background: #f8f9fc;
}

.themes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.theme-card {
    background: #ffffff;
    padding: 32px;
    border-radius: 12px;
    border-left: 4px solid #0066CC;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.theme-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.theme-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.theme-card p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
}

/* ==================== PROJECTS ==================== */
.projects {
    background: #ffffff;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.project-card {
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e5e5e5;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.project-image {
    position: relative;
    height: 240px;
    overflow: hidden;
}

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

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    top: 16px;
    right: 16px;
}

.project-category {
    background: rgba(0, 102, 204, 0.9);
    color: #ffffff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.project-content {
    padding: 24px;
}

.project-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.project-content p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.project-tags span {
    background: #f8f9fc;
    color: #0066CC;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ==================== CV ==================== */
.cv {
    background: #ffffff;
}

.cv-section {
    margin-bottom: 64px;
}

.cv-title {
    font-size: 28px;
    font-weight: 600;
    color: #0066CC;
    margin-bottom: 32px;
    padding-bottom: 12px;
    border-bottom: 2px solid #0066CC;
}

.cv-item {
    padding: 24px;
    background: #f8f9fc;
    border-radius: 12px;
    margin-bottom: 24px;
}

.cv-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 16px;
}

.cv-item h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 4px;
}

.cv-institution {
    font-size: 16px;
    color: #0066CC;
    font-weight: 500;
}

.cv-date {
    font-size: 15px;
    color: #4a4a4a;
    font-weight: 600;
    background: #ffffff;
    padding: 6px 14px;
    border-radius: 6px;
}

.cv-item p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
    margin-bottom: 12px;
}

.cv-item ul {
    list-style-position: inside;
    padding-left: 0;
}

.cv-item li {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.7;
    margin-bottom: 8px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.skill-category {
    padding: 24px;
    background: #f8f9fc;
    border-radius: 12px;
    border-left: 4px solid #0066CC;
}

.skill-category h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.skill-category p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
}

/* ==================== CONTACT ==================== */
.contact {
    background: #ffffff;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 64px;
}

.contact-form-section h2,
.contact-info-section h2 {
    font-size: 28px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 32px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 15px;
    font-weight: 500;
    color: #1a1a1a;
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border: 2px solid #e5e5e5;
    border-radius: 6px;
    font-size: 15px;
    font-family: 'Inter', sans-serif;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0066CC;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-note {
    font-size: 13px;
    color: #4a4a4a;
    margin-top: -8px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.contact-icon {
    font-size: 24px;
    min-width: 40px;
}

.contact-item h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.contact-item p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
}

.contact-item a {
    color: #0066CC;
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: #003d7a;
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.social-links a {
    padding: 6px 14px;
    background: #f8f9fc;
    color: #0066CC;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.3s ease, color 0.3s ease;
}

.social-links a:hover {
    background: #0066CC;
    color: #ffffff;
}

.availability {
    margin-top: 32px;
    padding: 20px;
    background: #f8f9fc;
    border-radius: 12px;
}

.availability h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.availability p {
    font-size: 14px;
    color: #4a4a4a;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

/* ==================== MAP ==================== */
.map {
    background: #f8f9fc;
    padding: 80px 0;
}

.map-container {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* ==================== BLOG ==================== */
.blog {
    background: #ffffff;
}

.blog-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.blog-intro p {
    font-size: 17px;
    color: #4a4a4a;
    line-height: 1.7;
    margin-bottom: 32px;
}

.blog-platforms {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.platform-link {
    padding: 12px 24px;
    background: #0066CC;
    color: #ffffff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.2s ease;
}

.platform-link:hover {
    background: #003d7a;
    transform: translateY(-2px);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.blog-card {
    background: #f8f9fc;
    padding: 32px;
    border-radius: 12px;
    border: 1px solid #e5e5e5;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.blog-category {
    display: inline-block;
    background: #0066CC;
    color: #ffffff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.blog-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
    line-height: 1.4;
}

.blog-card p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
    margin-bottom: 16px;
}

.blog-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.blog-platform {
    background: #ffffff;
    color: #0066CC;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.blog-link {
    color: #0066CC;
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s ease;
}

.blog-link:hover {
    color: #003d7a;
}

.blog-link.disabled {
    color: #9e9e9e;
    cursor: not-allowed;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.video-card {
    background: #f8f9fc;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.video-thumbnail {
    position: relative;
    height: 200px;
    overflow: hidden;
    cursor: pointer;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 102, 204, 0.9);
    color: #ffffff;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    transition: background 0.3s ease, transform 0.3s ease;
}

.video-card:hover .play-button {
    background: #003d7a;
    transform: translate(-50%, -50%) scale(1.1);
}

.video-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 20px 24px 12px;
}

.video-card p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.6;
    margin: 0 24px 20px;
}

.video-card .btn-small {
    margin: 0 24px 24px;
}

/* Blog Topics */
.blog-topics {
    text-align: center;
}

.topics-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    max-width: 900px;
    margin: 0 auto;
}

.topic-tag {
    background: #f8f9fc;
    color: #0066CC;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid #e5e5e5;
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.topic-tag:hover {
    background: #0066CC;
    color: #ffffff;
    border-color: #0066CC;
}

/* ==================== FOOTER ==================== */
.footer {
    background: #1a1a1a;
    color: #ffffff;
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-left p {
    font-size: 14px;
    color: #b0b0b0;
}

.footer-right {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-right a {
    color: #b0b0b0;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-right a:hover {
    color: #0066CC;
}

/* ==================== ANIMATIONS ==================== */
.fade-in {
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-description {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .page-header h1 {
        font-size: 36px;
    }

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

    .interests-grid,
    .themes-grid {
        grid-template-columns: 1fr;
    }

    section {
        padding: 60px 0;
    }
}