* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary: #2563eb;
    --secondary: #1e40af;
    --dark: #0f172a;
    --light: #f8fafc;
    --gray: #94a3b8;
    --accent: #059669;
}

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    height: 50px;
    display: flex;
    align-items: center;
}

.logo img {
    height: 100%;
    width: auto;
    max-height: 50px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.logo:hover img {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--primary);
}

.mobile-menu {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    background: linear-gradient(135deg, #dbeafe 0%, #e0f2fe 100%);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 20px;
    color: var(--dark);
}

.hero p {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    margin-bottom: 30px;
    color: var(--secondary);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--secondary);
}

/* Section Styles */
.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--dark);
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary);
}

/* About Section */
.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: clamp(1.5rem, 3vw, 1.8rem);
    margin-bottom: 20px;
    color: var(--secondary);
}

.about-image {
    flex: 1;
    text-align: center;
}

.about-image img {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Education Section */
.education-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.education-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--primary);
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    width: 100%;
}

.timeline-item:nth-child(odd) {
    padding-right: calc(50% + 30px);
    text-align: right;
}

.timeline-item:nth-child(even) {
    padding-left: calc(50% + 30px);
}

.timeline-content {
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    position: relative;
}

.timeline-content::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: white;
    border: 4px solid var(--primary);
    border-radius: 50%;
    top: 30px;
}

.timeline-item:nth-child(odd) .timeline-content::after {
    right: -50px;
}

.timeline-item:nth-child(even) .timeline-content::after {
    left: -50px;
}

.timeline-date {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 10px;
}

.timeline-title {
    font-size: clamp(1.1rem, 2.5vw, 1.3rem);
    margin-bottom: 10px;
    color: var(--dark);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.project-card:hover {
    transform: translateY(-10px);
}

.project-header {
    background-color: var(--primary);
    color: white;
    padding: 20px;
    text-align: center;
}

.project-content {
    padding: 25px;
}

.project-content h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.project-content p {
    margin-bottom: 15px;
}

/* Publications Section */
.publications-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    gap: 25px;
}

.publication-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--primary);
}

.publication-title {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
}

.publication-authors {
    color: var(--gray);
    font-style: italic;
    margin-bottom: 10px;
}

.publication-journal {
    font-weight: 500;
    color: var(--secondary);
}

/* Awards Section */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.award-card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: transform 0.3s;
}

.award-card:hover {
    transform: translateY(-5px);
}

.award-icon {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 15px;
}

.award-title {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
}

.award-date {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

/* Blog Section */
.blog {
    background-color: #f1f5f9;
}

.blog-posts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.blog-post {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.blog-image {
    height: 200px;
    background-color: var(--secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

.blog-content {
    padding: 25px;
}

.blog-content h3 {
    margin-bottom: 10px;
    color: var(--dark);
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

/* Blog Detail Page */
.blog-detail {
    background: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 40px;
}

.blog-detail h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 20px;
    color: var(--dark);
}

.blog-detail-meta {
    display: flex;
    justify-content: space-between;
    color: var(--gray);
    font-size: 1rem;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e2e8f0;
}

.blog-detail-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.blog-detail-content p {
    margin-bottom: 20px;
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.research-card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.research-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.research-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

/* Contact Section */
.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--primary);
}

.contact-form {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.form-group textarea {
    height: 200px;
    resize: vertical;
}

/* Footer */
footer {
    background-color: var(--dark);
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--primary);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: background-color 0.3s;
}

.social-links a:hover {
    background-color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Back Button */
.back-btn {
    display: inline-block;
    margin-bottom: 30px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.back-btn i {
    margin-right: 5px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .container {
        width: 95%;
    }
}

@media (max-width: 992px) {
    .about-content {
        flex-direction: column;
    }
    
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        padding: 0;
        text-align: center;
    }
    
    .timeline-content::after {
        left: 50%;
        margin-left: -10px;
        top: -30px;
    }
    
    .education-timeline::before {
        left: 50%;
        margin-left: -2px;
    }
    
    .publications-list {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
    
    .nav-links li {
        margin-left: 20px;
    }
    
    .logo {
        height: 45px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: white;
        flex-direction: column;
        align-items: center;
        padding-top: 50px;
        transition: left 0.3s;
        overflow-y: auto;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links li {
        margin: 15px 0;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero h1 {
        font-size: 2.3rem;
    }
    
    .section {
        padding: 70px 0;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .projects-grid,
    .blog-posts {
        grid-template-columns: 1fr;
    }
    
    .publications-list {
        grid-template-columns: 1fr;
    }
    
    .awards-grid {
        grid-template-columns: 1fr;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-detail h1 {
        font-size: 2rem;
    }
    
    .blog-detail-meta {
        flex-direction: column;
        gap: 10px;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    /* Improved mobile navigation */
    .nav-links {
        width: 80%;
        max-width: 300px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
    
    /* Improved mobile typography */
    .hero p {
        font-size: 1.1rem;
    }
    
    .about-text p {
        font-size: 1rem;
    }
    
    /* Better spacing for mobile */
    .section {
        padding: 60px 0;
    }
    
    .project-content, 
    .publication-item, 
    .award-card, 
    .research-card {
        padding: 20px;
    }
    
    .blog-detail {
        padding: 25px;
    }
    
    .contact-form {
        padding: 20px;
    }
    
    /* Logo adjustments for mobile */
    .logo {
        height: 40px;
    }
    
    nav {
        padding: 12px 0;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .section-title h2 {
        font-size: 1.8rem;
    }
    
    .timeline-date,
    .timeline-title {
        font-size: 1rem;
    }
    
    .project-header {
        padding: 15px;
    }
    
    .project-content {
        padding: 20px;
    }
    
    .publication-item {
        padding: 20px;
    }
    
    .award-card {
        padding: 20px;
    }
    
    .research-card {
        padding: 20px;
    }
    
    .blog-content {
        padding: 20px;
    }
    
    .contact-form {
        padding: 20px;
    }
    
    /* Further improved mobile navigation */
    .nav-links {
        width: 100%;
        max-width: none;
    }
    
    /* Better touch targets */
    .nav-links a {
        padding: 10px 0;
        display: block;
    }
    
    .btn {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Improved mobile forms */
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 15px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    /* Better mobile spacing */
    .hero {
        padding: 100px 0 60px;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .section-title {
        margin-bottom: 40px;
    }
    
    /* Improved mobile grid layouts */
    .projects-grid,
    .blog-posts,
    .awards-grid,
    .research-grid {
        gap: 20px;
    }
    
    /* Better mobile readability */
    .publication-title {
        font-size: 1.1rem;
    }
    
    .blog-detail-content {
        font-size: 1rem;
    }
    
    /* Logo adjustments for very small screens */
    .logo {
        height: 35px;
    }
    
    nav {
        padding: 10px 0;
    }
}

@media (max-width: 360px) {
    .container {
        width: 100%;
        padding: 0 15px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .section-title h2 {
        font-size: 1.6rem;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .projects-grid,
    .blog-posts,
    .awards-grid,
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .logo {
        height: 30px;
    }
}