/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.7;
    color: #1a1a1a;
    background-color: #fafafa;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-logo h2 {
    color: #0f0f0f;
    font-weight: 600;
    font-size: 1.4rem;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: #4a4a4a;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 8px 0;
}

.nav-link:hover {
    color: #0f0f0f;
    transform: translateY(-1px);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 1px;
}

.nav-link:hover::after {
    width: 100%;
}

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

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    padding: 140px 0 100px;
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 50%, #2d2d2d 100%);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #e5e7eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text h2 {
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: 2rem;
    opacity: 0.8;
    letter-spacing: -0.01em;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.85;
    line-height: 1.8;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.3);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.profile-image {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-image:hover {
    transform: scale(1.05);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}

.hero-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    border-radius: 50%;
    background: linear-gradient(45deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    z-index: -1;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
    opacity: 1;
    transform: translateY(0);
}

.section-header h2 {
    font-size: 3rem;
    font-weight: 700;
    color: #0f0f0f;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    position: relative;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    border-radius: 2px;
}

.section-header p {
    font-size: 1.2rem;
    color: #6a6a6a;
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

/* About Section */
.about {
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.03) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.about-text p {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    color: #4a4a4a;
    line-height: 1.8;
    font-weight: 400;
}


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

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, #6366f1 0%, #8b5cf6 100%);
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    margin-bottom: 4rem;
    padding-left: 80px;
}

.timeline-marker {
    position: absolute;
    left: 20px;
    top: 0;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 4px #f5f5f5, 0 4px 12px rgba(99, 102, 241, 0.2);
}

.timeline-content {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #6366f1 0%, #8b5cf6 100%);
}

.timeline-content:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.12);
}

.timeline-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #0f0f0f;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.timeline-content h4 {
    font-size: 1.1rem;
    color: #6366f1;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.timeline-date {
    font-size: 0.9rem;
    color: #8a8a8a;
    font-weight: 500;
    margin-bottom: 1.5rem;
    display: block;
    background: rgba(99, 102, 241, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-block;
}

.timeline-content p {
    color: #4a4a4a;
    line-height: 1.7;
    font-size: 1rem;
}

/* Publications Section */
.publications {
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    position: relative;
}

.publications::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.03) 0%, transparent 50%),
                radial-gradient(circle at 20% 80%, rgba(139, 92, 246, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2.5rem;
    position: relative;
    z-index: 1;
}

.publication-card {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.publication-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #6366f1 0%, #8b5cf6 100%);
}

.publication-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.publication-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.publication-type {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    color: #6366f1;
    padding: 6px 16px;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.publication-date {
    color: #8a8a8a;
    font-size: 0.9rem;
    font-weight: 500;
}

.publication-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #0f0f0f;
    margin-bottom: 1.25rem;
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.publication-card p {
    color: #4a4a4a;
    margin-bottom: 2rem;
    line-height: 1.7;
    font-size: 1rem;
}

.publication-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    background: rgba(99, 102, 241, 0.08);
    color: #6366f1;
    padding: 6px 14px;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(99, 102, 241, 0.15);
    transition: all 0.3s ease;
}

.tag:hover {
    background: rgba(99, 102, 241, 0.15);
    transform: translateY(-1px);
}

/* Contact Section */
.contact-content {
    display: flex;
    justify-content: center;
    align-items: start;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    max-width: 900px;
    width: 100%;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #6366f1 0%, #8b5cf6 100%);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.contact-item i {
    font-size: 1.5rem;
    color: #6366f1;
    width: 40px;
    text-align: center;
    background: rgba(99, 102, 241, 0.1);
    padding: 12px;
    border-radius: 12px;
}

.contact-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #0f0f0f;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.contact-item p {
    color: #6a6a6a;
    font-weight: 500;
}

.contact-item a {
    color: #6366f1;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.contact-item a:hover {
    color: #8b5cf6;
    transform: translateY(-1px);
}

.contact-item a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    transition: width 0.3s ease;
}

.contact-item a:hover::after {
    width: 100%;
}



/* Footer */
.footer {
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    color: white;
    padding: 3rem 0;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, #6366f1 50%, transparent 100%);
}

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

.footer-links {
    display: flex;
    gap: 2.5rem;
}

.footer-links a {
    color: #a0a0a0;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    position: relative;
}

.footer-links a:hover {
    color: white;
    transform: translateY(-2px);
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    transition: width 0.3s ease;
}

.footer-links a:hover::after {
    width: 100%;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

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

    .nav-menu li {
        margin: 1rem 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

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

    .hero-text h2 {
        font-size: 1.2rem;
    }

    .about-content {
        max-width: 100%;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-marker {
        left: 5px;
    }

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

    .contact-info {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }


    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

/* Smooth scrolling and animations */
@media (prefers-reduced-motion: no-preference) {
    .publication-card,
    .timeline-item,
    .contact-item {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Animation classes for scroll-triggered effects */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}