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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --dark-bg: #0f172a;
    --light-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --transition: all 0.3s ease;
}

[data-theme="light"] {
    --dark-bg: #f8fafc;
    --light-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

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

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

.section {
    min-height: 100vh;
    padding: 100px 0;
    display: flex;
    align-items: center;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-section {
    background: linear-gradient(135deg, var(--dark-bg) 0%, #1e1b4b 100%);
}

.home-content {
    text-align: center;
    animation: fadeInUp 1s ease;
}

.profile-image {
    width: 200px;
    height: 200px;
    margin: 0 auto 2rem;
    border-radius: 50%;
    overflow: hidden;
    border: 5px solid var(--primary-color);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
    animation: float 3s ease-in-out infinite;
}

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

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

.main-title {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.description {
    max-width: 700px;
    margin: 0 auto 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.tag {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
    transition: var(--transition);
}

.tag:hover {
    background-color: rgba(99, 102, 241, 0.2);
    transform: translateY(-3px);
}

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

.stats-section {
    background: linear-gradient(135deg, var(--light-bg) 0%, #f1f5f9 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.testimonials-section {
    background-color: var(--dark-bg);
}

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

.testimonial-card {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.testimonial-content p {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.testimonial-author {
    border-top: 1px solid rgba(99, 102, 241, 0.2);
    padding-top: 1rem;
}

.author-name {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.author-title {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    text-align: center;
}

.cta-content h2 {
    color: white;
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-section .btn-primary {
    background-color: white;
    color: var(--primary-color);
}

.cta-section .btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

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

.btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.5);
}

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.experience-section {
    background-color: var(--dark-bg);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
    width: calc(50% - 40px);
}

.timeline-item:nth-child(odd) {
    margin-left: 0;
}

.timeline-item:nth-child(even) {
    margin-left: auto;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border: 4px solid var(--dark-bg);
    border-radius: 50%;
    top: 0;
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -50px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -50px;
}

.timeline-content {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

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

.timeline-date {
    color: var(--accent-color);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 1rem;
}

.experience-highlights {
    margin-top: 1rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.experience-highlights li {
    margin-bottom: 0.5rem;
}

.skills-section {
    background: linear-gradient(135deg, #1e1b4b 0%, var(--dark-bg) 100%);
}

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

.skill-category {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-item {
    margin-bottom: 1.5rem;
}

.skill-name {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.skill-bar {
    background-color: rgba(99, 102, 241, 0.1);
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 5px;
    transition: width 1s ease;
    width: 0;
}

.projects-section {
    background-color: var(--dark-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.project-card {
    background-color: var(--light-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.4);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(99, 102, 241, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    color: white;
    font-size: 2rem;
    transition: var(--transition);
}

.project-link:hover {
    transform: scale(1.2);
}

.project-content {
    padding: 1.5rem;
}

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

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

.project-tags span {
    background-color: rgba(99, 102, 241, 0.2);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
}

.research-section {
    margin-top: 3rem;
}

.research-section h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.research-list {
    display: grid;
    gap: 1.5rem;
}

.research-item {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 10px;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    transition: var(--transition);
}

.research-item:hover {
    transform: translateX(10px);
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.3);
}

.research-item i {
    font-size: 2.5rem;
    color: var(--accent-color);
}

.research-content h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.research-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.pdf-download {
    color: var(--primary-color);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.pdf-download:hover {
    color: var(--accent-color);
}

.contact-section {
    background: linear-gradient(135deg, #1e1b4b 0%, var(--dark-bg) 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-details {
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.cv-download {
    margin-top: 2rem;
}

.contact-form {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    background-color: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.15);
}

.form-group textarea {
    resize: vertical;
}

.form-message {
    margin-top: 1rem;
    padding: 0.8rem;
    border-radius: 8px;
    display: none;
}

.form-message.success {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
    border: 1px solid var(--success-color);
    display: block;
}

.form-message.error {
    background-color: rgba(239, 68, 68, 0.2);
    color: #ef4444;
    border: 1px solid #ef4444;
    display: block;
}

.footer {
    background-color: #0a0f1e;
    padding: 3rem 0 1rem;
}

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

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

.footer-column p {
    color: var(--text-secondary);
}

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

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

.footer-column ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--primary-color);
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background-color: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(99, 102, 241, 0.2);
    padding-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.legal-section {
    background-color: var(--dark-bg);
    padding-top: 120px;
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--light-bg);
    padding: 3rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.legal-updated {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 2rem;
}

.legal-content h2 {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.legal-content h3 {
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
}

.legal-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.legal-content ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.legal-content ul li {
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

.legal-content a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.legal-content a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 1.2rem;
    margin-left: 1rem;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
    transform: rotate(180deg);
}

.nav-right {
    display: flex;
    align-items: center;
}

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

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

    .theme-toggle {
        margin-left: 0.5rem;
        margin-right: 0.5rem;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--dark-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.5);
        padding: 2rem 0;
    }

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

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

    .subtitle {
        font-size: 1.2rem;
    }

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

    .timeline-item {
        width: 100%;
        margin-left: 40px !important;
    }

    .timeline-item .timeline-dot {
        left: -30px !important;
    }

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

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .cta-buttons {
        flex-direction: column;
    }
}