:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --accent-primary: #2563eb;
    --accent-secondary: #1d4ed8;
    --border-color: #333333;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

.nav-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-primary);
    transition: var(--transition);
}

.nav-logo-img:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.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:hover {
    color: var(--text-primary);
}

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

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

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

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    text-align: center;
    position: relative;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    z-index: 2;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 300;
}

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

.btn {
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.btn-outline:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-secondary);
    border-bottom: 2px solid var(--text-secondary);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Sections */
section {
    padding: 6rem 0;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 4rem;
    color: var(--text-primary);
}

/* About Section */
.about {
    background: var(--bg-secondary);
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    gap: 4rem;
    text-align: left;
}

.about-image {
    flex-shrink: 0;
}

.profile-picture {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent-primary);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.profile-picture:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.about-text {
    flex: 1;
}

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

.skills {
    margin-top: 3rem;
}

.skills h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.skill-tag {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

/* Certifications */
.certifications {
    margin-bottom: 3rem;
}

.certifications h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.cert-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-tertiary);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.cert-item:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.cert-item i {
    color: var(--accent-primary);
    font-size: 1.2rem;
}

.cert-name {
    color: var(--text-primary);
    font-weight: 500;
}

/* Publications Inline */
.publications-inline {
    margin-bottom: 3rem;
}

.publications-inline h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.publication-item-inline {
    background: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.publication-item-inline:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.publication-title-inline {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    margin-top: 0;
}

.publication-title-inline a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: var(--transition);
}

.publication-title-inline a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.publication-venue-inline {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 0.75rem;
}

.publication-description-inline {
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
    font-size: 0.95rem;
}

/* Music Section */
.music {
    background: var(--bg-primary);
}

.music-content {
    max-width: 600px;
    margin: 0 auto;
}

.audio-player {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.player-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.player-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.player-controls audio {
    width: 100%;
    height: 50px;
    background: var(--bg-tertiary);
    border-radius: 8px;
}

/* Projects Section */
.projects {
    background: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

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

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

.project-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    background: var(--bg-primary);
    color: var(--accent-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    border: 1px solid var(--accent-primary);
}

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

.project-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--text-primary);
}

.loading {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    grid-column: 1 / -1;
}

.github-link {
    text-align: center;
}

/* Contact Section */
.contact {
    background: var(--bg-primary);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    padding: 1.5rem;
    border-radius: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    min-width: 120px;
}

.contact-link:hover {
    color: var(--accent-primary);
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}

.contact-link i {
    font-size: 2rem;
}

/* Footer */
.footer {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 2rem 0;
        border-top: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 200px;
        justify-content: center;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .about-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
        align-items: center;
    }
    
    .profile-picture {
        width: 200px;
        height: 200px;
    }
}

@media (max-width: 480px) {
    .skill-tags {
        justify-content: center;
    }
    
    .project-links {
        flex-direction: column;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}