:root {
    --bg-dark: #0a0e27;
    --bg-light: #151b3d;
    --bg-card: #1a2040;
    --border-color: #2d3561;
    --text-primary: #e4e8ff;
    --text-secondary: #8892b0;
    --accent-primary: #00d9ff;
    --accent-secondary: #7000ff;
    --accent-gradient: linear-gradient(135deg, #00d9ff, #7000ff);
    --success: #00ff88;
    --warning: #ffaa00;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    --shadow-sm: 0 2px 10px rgba(0, 217, 255, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 217, 255, 0.2);
    --shadow-lg: 0 10px 40px rgba(112, 0, 255, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.circuit-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background: var(--bg-dark);
    background-image: 
        linear-gradient(rgba(0, 217, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 217, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: circuitMove 20s linear infinite;
}

@keyframes circuitMove {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 50px 50px;
    }
}

.geometric-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.geometric-shapes::before,
.geometric-shapes::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s ease-in-out infinite;
}

.geometric-shapes::before {
    width: 600px;
    height: 600px;
    background: var(--accent-primary);
    top: -200px;
    right: -200px;
}

.geometric-shapes::after {
    width: 500px;
    height: 500px;
    background: var(--accent-secondary);
    bottom: -150px;
    left: -150px;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(50px, -50px) rotate(120deg);
    }
    66% {
        transform: translate(-50px, 50px) rotate(240deg);
    }
}

header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
}

.nav-brand {
    font-family: var(--font-mono);
    font-weight: 900;
    font-size: 1.5rem;
    color: var(--accent-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.2rem;
    transition: var(--transition);
}

.nav-brand:hover {
    transform: translateY(-2px);
}

.logo-bracket {
    color: var(--accent-secondary);
}

.logo-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 28px;
    height: 2px;
    background: var(--accent-primary);
    position: relative;
    transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--accent-primary);
    transition: var(--transition);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-toggle.active .hamburger {
    background: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.mobile-menu-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
    transition: var(--transition);
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent-primary);
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 2rem 0;
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 5rem;
    width: 100%;
}

.hero-text {
    flex: 1.5;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid var(--accent-primary);
    border-radius: 50px;
    color: var(--accent-primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.1;
}

.glitch-text {
    position: relative;
}

.subtitle {
    font-size: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.bio {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 60ch;
    line-height: 1.8;
}

.highlight {
    color: var(--accent-primary);
    font-weight: 600;
    position: relative;
}

.social-links {
    margin-top: 2.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    background: transparent;
}

.social-btn:hover {
    background: var(--accent-primary);
    color: var(--bg-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-wrapper {
    position: relative;
    width: 300px;
    height: 300px;
}

.orbit-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 320px;
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: orbitRotate 15s linear infinite;
}

.orbit-ring-2 {
    width: 350px;
    height: 350px;
    border-color: var(--accent-secondary);
    animation-duration: 20s;
    animation-direction: reverse;
}

@keyframes orbitRotate {
    0% {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    100% {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.profile-picture {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 4px solid var(--accent-primary);
    object-fit: cover;
    box-shadow: 0 0 40px rgba(0, 217, 255, 0.4);
    position: relative;
    z-index: 1;
}

.profile-placeholder {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 4px solid var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    font-size: 4rem;
    color: var(--accent-primary);
}

.content-section {
    padding: 6rem 0;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 4rem;
    color: var(--text-primary);
}

.section-number {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.section-line {
    flex: 1;
    height: 1px;
    background: var(--border-color);
    margin-left: 1rem;
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-gradient);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition);
}

.timeline-item[data-aos="fade-up"] {
    opacity: 1;
    transform: translateX(0);
}

.timeline-dot {
    position: absolute;
    left: -2.5rem;
    top: 0;
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent-primary);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-content h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 700;
}

.timeline-date {
    color: var(--accent-primary);
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

.company {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.description {
    color: var(--text-secondary);
    line-height: 1.7;
}

.tech-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.tag {
    background: rgba(0, 217, 255, 0.1);
    color: var(--accent-primary);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid var(--accent-primary);
}

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

.publication-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.publication-card[data-aos="fade-up"] {
    opacity: 1;
    transform: translateY(0);
}

.publication-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.publication-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.publication-card h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.pub-venue {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.pub-date {
    color: var(--accent-primary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.pub-actions {
    display: flex;
    gap: 0.5rem;
}

.pub-btn {
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.pub-btn:hover {
    background: var(--accent-primary);
    color: var(--bg-dark);
}

.teaching-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.teaching-card[data-aos="fade-up"] {
    opacity: 1;
    transform: translateY(0);
}

.teaching-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.teaching-icon {
    font-size: 3rem;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.teaching-content h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.project-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(0, 217, 255, 0.1);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateY(30px);
}

.project-card[data-aos="fade-up"] {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

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

.project-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
}

.project-link-icon {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition);
}

.project-link-icon:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}

.project-card h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.project-card > p {
    color: var(--text-secondary);
    line-height: 1.7;
    flex-grow: 1;
    margin-bottom: 1.5rem;
}

.project-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.project-link:hover {
    gap: 1rem;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.skill-category[data-aos="fade-up"] {
    opacity: 1;
    transform: translateY(0);
}

.skill-category:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

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

.skill-header i {
    font-size: 1.8rem;
    color: var(--accent-primary);
}

.skill-header h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-item span {
    color: var(--text-primary);
    font-weight: 600;
}

.skill-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 10px;
    transition: width 1s ease-in-out;
}

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

.skill-tag {
    background: rgba(0, 217, 255, 0.1);
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--accent-primary);
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--accent-primary);
    color: var(--bg-dark);
}

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

.leadership-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.leadership-card[data-aos="fade-up"] {
    opacity: 1;
    transform: translateY(0);
}

.leadership-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.leadership-icon {
    font-size: 3rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.leadership-card h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.leadership-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.contact-section {
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(30px);
}

.contact-content[data-aos="fade-up"] {
    opacity: 1;
    transform: translateY(0);
}

.contact-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    background: var(--accent-gradient);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}

.footer-year {
    margin-top: 1rem;
    font-size: 0.9rem;
}

#scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

#scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#scroll-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

@media (max-width: 968px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        flex-direction: column;
        background: rgba(10, 14, 39, 0.98);
        backdrop-filter: blur(20px);
        width: 100%;
        max-width: 300px;
        padding: 2rem;
        border-left: 1px solid var(--border-color);
        height: calc(100vh - 70px);
        transition: var(--transition);
        gap: 2rem;
        align-items: flex-start;
    }

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

    .hero-container {
        flex-direction: column-reverse;
        gap: 3rem;
        text-align: center;
    }

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

    .bio {
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }

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

    .section-line {
        display: none;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-dot {
        left: -2rem;
    }
}

@media (max-width: 640px) {
    .navbar {
        padding: 1rem;
    }

    main {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .profile-wrapper,
    .profile-picture,
    .profile-placeholder {
        width: 200px;
        height: 200px;
    }

    .orbit-ring {
        width: 220px;
        height: 220px;
    }

    .orbit-ring-2 {
        width: 250px;
        height: 250px;
    }

    .content-section {
        padding: 4rem 0;
    }

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

    .project-filters {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}