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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
}

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

.nav-links a {
    text-decoration: none;
    color: #333;
    transition: color 0.3s ease;
    font-weight: 500;
}

.nav-links a:hover {
    color: #2563eb;
}

.mobile-menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    z-index: 1;
    position: relative;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.5s forwards;
}

.hero .subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.7s forwards;
    color: rgba(255, 255, 255, 0.9);
}

.hero .description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.9s forwards;
    color: rgba(255, 255, 255, 0.8);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    opacity: 0;
    animation: fadeInUp 1s ease 1.1s forwards;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background: white;
    color: #2563eb;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

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

.btn-secondary:hover {
    background: white;
    color: #2563eb;
}

/* Floating elements */
.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-element {
    position: absolute;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.floating-element:nth-child(1) {
    animation-delay: 0s;
}

.floating-element:nth-child(2) {
    animation-delay: -2s;
}

.floating-element:nth-child(3) {
    animation-delay: -4s;
}

.floating-element:nth-child(4) {
    animation-delay: -1s;
    animation-duration: 8s;
}

.floating-element:nth-child(5) {
    animation-delay: -3s;
    animation-duration: 7s;
}

.floating-element:nth-child(6) {
    animation-delay: -5s;
    animation-duration: 9s;
}

.floating-element:nth-child(7) {
    animation-delay: -2.5s;
    animation-duration: 6.5s;
}

.floating-element:nth-child(8) {
    animation-delay: -4.5s;
    animation-duration: 7.5s;
}

/* Section Styles */
.section {
    padding: 5rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1f2937;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #6b7280;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* About Section */
.about {
    background: #f8fafc;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: center;
}

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

.profile-img {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid #2563eb;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #4b5563;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #2563eb;
}

.stat-label {
    color: #6b7280;
    font-weight: 500;
}

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

.experience-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.experience-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.experience-date {
    color: #2563eb;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.experience-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #1f2937;
}

.experience-company {
    color: #6b7280;
    margin-bottom: 1rem;
    font-weight: 500;
}

.experience-description {
    color: #4b5563;
    line-height: 1.6;
    font-size: 0.95rem;
}

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

.project-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.project-icon {
    font-size: 2.5rem;
    color: #2563eb;
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1f2937;
}

.project-description {
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

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

.tag {
    background: #e0e7ff;
    color: #3730a3;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Skills Section */
.skills {
    background: #f8fafc;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.skill-category {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #1f2937;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category i {
    color: #2563eb;
}

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

.skill-list li {
    padding: 0.5rem 0;
    color: #4b5563;
    border-bottom: 1px solid #e5e7eb;
}

.skill-list li:last-child {
    border-bottom: none;
}

/* Publications */
.publications {
    background: white;
}

.publication-item {
    background: #f8fafc;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 10px;
    border-left: 4px solid #2563eb;
}

.publication-title {
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.publication-title a {
    color: #1f2937;
    text-decoration: none;
    transition: color 0.3s ease;
}

.publication-title a:hover {
    color: #2563eb;
}

.publication-journal {
    color: #2563eb;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.publication-authors {
    color: #6b7280;
    font-size: 0.9rem;
}

.academic-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.academic-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: #2563eb;
    color: white;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    font-weight: 600;
}

.academic-link:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

.academic-link i {
    font-size: 1.2rem;
}

/* YouTube Tutorials */
.tutorials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tutorial-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tutorial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.tutorial-video {
    position: relative;
    width: 100%;
    height: 225px;
    overflow: hidden;
}

.tutorial-video iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.tutorial-content {
    padding: 2rem;
}

.tutorial-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1f2937;
}

.tutorial-description {
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.tutorial-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #ff0000;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.tutorial-link:hover {
    color: #cc0000;
}

/* News Section */
.news {
    background: #f8fafc;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.news-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    gap: 1.5rem;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.news-icon {
    flex-shrink: 0;
}

.news-icon i {
    font-size: 2.5rem;
    color: #2563eb;
}

.news-content {
    flex: 1;
}

.news-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1f2937;
}

.news-description {
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.news-source {
    color: #2563eb;
    font-weight: 600;
}

.news-date {
    color: #6b7280;
}

.news-link {
    color: #2563eb;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.news-link:hover {
    color: #1d4ed8;
}

/* Contact Section */
.contact {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.contact .section-title {
    color: white;
}

.contact .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.contact-item i {
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.8);
}

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

.contact-item a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Scroll reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: flex;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .timeline::after {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        left: 0;
        padding-left: 3rem;
        padding-right: 0;
    }

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

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

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

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

    .contact-info {
        grid-template-columns: 1fr;
    }

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

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

    .news-card {
        flex-direction: column;
        text-align: center;
    }

    .academic-links {
        flex-direction: column;
        align-items: center;
    }
}
/* GIS Section */
.gis {
    background: #f8fafc;
}

.gis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.gis-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    gap: 1.5rem;
}

.gis-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.gis-icon {
    flex-shrink: 0;
}

.gis-icon i {
    font-size: 2.5rem;
    color: #059669;
}

.gis-content {
    flex: 1;
}

.gis-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1f2937;
}

.gis-description {
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.gis-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.gis-type {
    color: #059669;
    font-weight: 600;
}

.gis-date {
    color: #6b7280;
}

.gis-link {
    color: #059669;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.gis-link:hover {
    color: #047857;
}

/* Responsive Design for GIS */
@media (max-width: 768px) {
    .gis-grid {
        grid-template-columns: 1fr;
    }

    .gis-card {
        flex-direction: column;
        text-align: center;
    }
}
/* Teaching Section */
.teaching {
    background: white;
}

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

.teaching-card {
    background: #f8fafc;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.teaching-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.teaching-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.award-card {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 2px solid #f59e0b;
}

.award-card::before {
    background: linear-gradient(90deg, #f59e0b, #d97706);
}

.teaching-icon {
    font-size: 2.5rem;
    color: #2563eb;
    margin-bottom: 1rem;
    text-align: center;
}

.award-card .teaching-icon {
    color: #d97706;
}

.teaching-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #1f2937;
    text-align: center;
}

.teaching-institution {
    color: #2563eb;
    font-weight: 600;
    margin-bottom: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

.award-card .teaching-institution {
    color: #d97706;
}

.teaching-description {
    color: #4b5563;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    text-align: center;
}

.teaching-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.highlight-tag {
    background: #e0e7ff;
    color: #3730a3;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.award-tag {
    background: #fbbf24;
    color: #92400e;
}

/* Responsive Design for Teaching */
@media (max-width: 768px) {
    .teaching-grid {
        grid-template-columns: 1fr;
    }
}
/* CV Download Button */
.btn-cv {
    background: white !important;
    color: #2563eb !important; /* Blue text like "Get in Touch" */
    border: 2px solid white !important;
    padding: 0.75rem 1.5rem !important;
    border-radius: 25px !important;
    font-weight: 600 !important;
    text-decoration: none !important;
    transition: all 0.3s ease !important;
    display: inline-block !important;
}

.btn-cv:hover {
    background: #f8fafc !important; /* Slightly off-white on hover */
    color: #1d4ed8 !important; /* Darker blue on hover */
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.3) !important;
    text-decoration: none !important;
}



.btn-cv:hover {
    background: #047857;
    border-color: #047857;
}