* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
}

:root {
    --bg-dark: #0f172a;
    --bg-secondary: #1e293b;
    --primary: #3b82f6;
    --secondary: #8b5cf6;
    --text-light: #f1f5f9;
    --text-muted: #94a3b8;
    --gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
}

body {
    background: var(--bg-dark);
    color: var(--text-light);
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-light);
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 35px;
}

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    width: 0;
    height: 2px;
    background: var(--gradient);
    position: absolute;
    bottom: -5px;
    left: 0;
    transition: 0.3s;
}

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

.hamburger {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 100px 8% 50px;
    gap: 50px;
}

.hero-content {
    flex: 1;
    animation: slideInLeft 1s ease;
}

.hero-content h4 {
    color: var(--primary);
    font-size: 20px;
    margin-bottom: 10px;
}

.hero-content h1 {
    font-size: 60px;
    font-weight: 800;
    margin-bottom: 15px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content h3 {
    font-size: 28px;
    margin-bottom: 20px;
}

.typing {
    color: var(--primary);
    font-weight: 600;
}

.hero-content p {
    color: var(--text-muted);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 30px;
    max-width: 550px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

.btn {
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 5px 20px #3b82f666;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.6);
}

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

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

.social-icons {
    display: flex;
    gap: 20px;
}

.social-icons a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    text-decoration: none;
    font-size: 20px;
    transition: 0.3s;
    border: 1px solid rgba(255,255,255,0.1);
}

.social-icons a:hover {
    background: var(--gradient);
    transform: translateY(-5px);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    animation: slideInRight 1s ease;
}

.image-wrapper {
    width: 380px;
    height: 380px;
    border-radius: 50%;
    overflow: hidden;
    border: 5px solid var(--primary);
    box-shadow: 0 0 50px rgba(59, 130, 246, 0.4);
    animation: float 3s ease-in-out infinite;
}

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

/* Sections */
section {
    padding: 100px 8%;
}

.section-title {
    text-align: center;
    font-size: 42px;
    margin-bottom: 60px;
    font-weight: 700;
}

.section-title span {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* About */
.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--primary);
}

.about-text p {
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 16px;
}

.about-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.info-item {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: 0.3s;
    border: 1px solid rgba(255,255,255,0.05);
}

.info-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.info-item i {
    font-size: 28px;
    color: var(--primary);
}

.info-item h4 {
    font-size: 16px;
    margin-bottom: 5px;
}

.info-item p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Skills */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.skill-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    transition: 0.3s;
    border: 1px solid rgba(255,255,255,0.05);
}

.skill-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.skill-card i {
    font-size: 50px;
    color: var(--primary);
    margin-bottom: 15px;
}

.skill-card h3 {
    margin-bottom: 15px;
    font-size: 18px;
}

.progress-bar {
    background: var(--bg-dark);
    height: 8px;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress {
    height: 100%;
    background: var(--gradient);
    border-radius: 10px;
    animation: fillBar 2s ease;
}

.skill-card span {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    transition: 0.3s;
    border: 1px solid #ffffff0d;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.project-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.project-card p {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}

.project-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.project-tags span {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.project-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: 0.3s;
}

.project-link:hover {
    gap: 15px;
}

/* Publications */
#publications {
    padding: 100px 8%;
    background: var(--bg-dark);
}

#publications h2 {
    text-align: center;
    font-size: 42px;
    margin-bottom: 60px;
    font-weight: 700;
}

.publication-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    transition: 0.3s;
    border: 1px solid rgba(255,255,255,0.05);
    border-left: 5px solid var(--primary);
}

.publication-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
}

.publication-card h3 {
    color: var(--primary);
    margin-bottom: 15px;
    font-size: 22px;
    line-height: 1.5;
}

.publication-card p {
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 20px;
}

.publication-card a {
    display: inline-block;
    padding: 12px 22px;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: 0.3s;
}

.publication-card a:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

/* Certifications */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.cert-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    transition: 0.3s;
    border: 1px solid rgba(255,255,255,0.05);
}

.cert-card:hover {
    transform: scale(1.05);
    border-color: var(--secondary);
}

.cert-card i {
    font-size: 40px;
    color: var(--secondary);
    margin-bottom: 15px;
}

.cert-card h4 {
    margin-bottom: 8px;
    font-size: 16px;
}

.cert-card p {
    color: var(--text-muted);
    font-size: 13px;
}

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

.timeline-item {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    border-left: 4px solid var(--primary);
    display: flex;
    gap: 25px;
    align-items: flex-start;
}

.timeline-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.timeline-content h3 {
    margin-bottom: 5px;
    color: var(--primary);
}

.timeline-content .date {
    color: var(--text-muted);
    font-size: 14px;
    display: block;
    margin-bottom: 15px;
}

.timeline-content ul {
    list-style: none;
    padding-left: 0;
}

.timeline-content li {
    color: var(--text-muted);
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
    line-height: 1.6;
}

.timeline-content li::before {
    content: '▸';
    color: var(--primary);
    position: absolute;
    left: 0;
}

/* Contact */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    max-width: 1100px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: 0.3s;
    border: 1px solid rgba(255,255,255,0.05);
}

.contact-item:hover {
    transform: translateX(10px);
    border-color: var(--primary);
}

.contact-item i {
    font-size: 28px;
    color: var(--primary);
    width: 50px;
    height: 50px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--text-muted);
    font-size: 14px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.contact-form input,
.contact-form textarea {
    padding: 15px 20px;
    background: var(--bg-secondary);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    color: var(--text-light);
    font-size: 15px;
    font-family: inherit;
    transition: 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.contact-form button {
    align-self: flex-start;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    background: var(--bg-secondary);
    color: var(--text-muted);
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* Animations */
@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

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

@keyframes fillBar {
    from { width: 0; }
}

/* Responsive */
@media (max-width: 768px) {
    .hamburger { display: block; }
    
    .nav-links {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 30px;
        transition: 0.3s;
    }
    
    .nav-links.active { right: 0; }
    
    .hero {
        flex-direction: column-reverse;
        text-align: center;
        padding-top: 120px;
    }
    
    .hero-content h1 { font-size: 40px; }
    .hero-content h3 { font-size: 22px; }
    
    .hero-buttons,
    .social-icons {
        justify-content: center;
    }
    
    .image-wrapper {
        width: 250px;
        height: 250px;
    }
    
    .section-title { font-size: 32px; }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    section { padding: 70px 5%; }
}