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

:root {
    --bg-primary: #0a192f;
    --bg-secondary: #121212;
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --accent-blue: #64ffda;
    --accent-blue-dark: #1e3a5f;
    --glacial-blue: #1a4d7a;
    --spacing-unit: 1rem;
}

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;
    font-weight: 300;
    overflow-x: hidden;
}

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

/* Hero Section */
.hero-section {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    z-index: 1;
}

.hero-image-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    will-change: opacity;
    pointer-events: none;
}

.hero-image.active {
    opacity: 1;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(10, 25, 47, 0.3) 0%,
        rgba(10, 25, 47, 0.5) 50%,
        rgba(10, 25, 47, 0.8) 100%
    );
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.hero-content {
    text-align: center;
    padding: 2rem;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    font-weight: 300;
    margin-bottom: 3rem;
    color: var(--text-secondary);
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.5);
}

.hero-text-overlay {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 60px;
}

.overlay-text {
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    font-weight: 400;
    color: var(--accent-blue);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.7);
}

.overlay-text.visible {
    opacity: 1;
    transform: translateY(0);
}

/* About Section */
.about-section {
    position: relative;
    background-color: var(--bg-primary);
    padding: 8rem 0;
    z-index: 10;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    opacity: 0;
    transform: translateY(30px);
}

.section-title.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.about-content {
    max-width: 1200px;
    display: flex;
    gap: 4rem;
    align-items: flex-start;
}

.about-text-content {
    flex: 1;
    min-width: 0;
}

.about-image-wrapper {
    flex-shrink: 0;
    width: 280px;
    height: 280px;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
}

.about-image-wrapper.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease 0.4s, transform 0.8s ease 0.4s;
}

.about-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
    border: 2px solid rgba(100, 255, 218, 0.2);
    background: linear-gradient(135deg, rgba(100, 255, 218, 0.05) 0%, rgba(30, 58, 95, 0.1) 100%);
    padding: 0.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(100, 255, 218, 0.1) inset;
    transition: all 0.4s ease;
}

.about-image:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 12px 48px rgba(100, 255, 218, 0.2), 0 0 0 1px rgba(100, 255, 218, 0.3) inset;
    transform: translateY(-4px);
}

.about-text {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-weight: 300;
    opacity: 0;
    transform: translateY(30px);
}

.about-text.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease 0.2s, transform 0.8s ease 0.2s;
}

.about-text:nth-child(2) {
    transition-delay: 0.3s;
}

.about-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.link-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.link-button.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease 0.4s, transform 0.6s ease 0.4s;
}

.link-button:hover {
    background-color: var(--accent-blue);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(100, 255, 218, 0.3);
}

/* Technical Expertise Section */
.expertise-section {
    position: relative;
    background-color: var(--bg-secondary);
    padding: 8rem 0;
    z-index: 10;
}

.expertise-content {
    max-width: 1000px;
    margin: 0 auto;
    margin-top: 3rem;
}

.expertise-category {
    margin-bottom: 3rem;
}

.expertise-category:last-child {
    margin-bottom: 0;
}

.expertise-category-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
    opacity: 0;
    transform: translateY(20px);
}

.expertise-category-title.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.expertise-tag {
    display: inline-block;
    font-size: 0.95rem;
    color: var(--text-secondary);
    background-color: rgba(30, 58, 95, 0.4);
    border: 1px solid rgba(100, 255, 218, 0.15);
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 400;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(15px);
}

.expertise-tag.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.expertise-tag:hover {
    border-color: var(--accent-blue);
    background-color: rgba(100, 255, 218, 0.1);
    color: var(--accent-blue);
    transform: translateY(-2px);
}

/* Projects Section */
.projects-section {
    position: relative;
    background-color: var(--bg-secondary);
    padding: 8rem 0;
    z-index: 10;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.project-card {
    background-color: rgba(30, 58, 95, 0.3);
    border: 1px solid rgba(100, 255, 218, 0.1);
    padding: 2.5rem;
    border-radius: 8px;
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(40px);
    backdrop-filter: blur(10px);
}

.project-card.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.project-card:nth-child(1) {
    transition-delay: 0.1s;
}

.project-card:nth-child(2) {
    transition-delay: 0.2s;
}

.project-card:nth-child(3) {
    transition-delay: 0.3s;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-blue);
    box-shadow: 0 8px 24px rgba(100, 255, 218, 0.15);
    background-color: rgba(30, 58, 95, 0.5);
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.project-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    font-weight: 300;
}

/* Presentations Section */
.presentations-section {
    position: relative;
    background-color: var(--bg-secondary);
    padding: 8rem 0;
    z-index: 10;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 300;
    text-align: center;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(20px);
}

.section-subtitle.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease 0.2s, transform 0.8s ease 0.2s;
}

.presentations-group {
    margin-bottom: 4rem;
}

.presentations-group:last-child {
    margin-bottom: 0;
}

.presentations-group-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
}

.presentations-group-title.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.presentations-list {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.presentation-card {
    background-color: rgba(30, 58, 95, 0.3);
    border: 1px solid rgba(100, 255, 218, 0.1);
    padding: 2.5rem;
    border-radius: 8px;
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(40px);
    backdrop-filter: blur(10px);
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.presentation-card.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.presentation-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
    box-shadow: 0 8px 24px rgba(100, 255, 218, 0.15);
    background-color: rgba(30, 58, 95, 0.5);
}

.presentation-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 80px;
    padding: 1rem;
    background-color: rgba(100, 255, 218, 0.1);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: 8px;
    text-align: center;
}

.date-day {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    line-height: 1;
}

.presentation-date .date-day {
    font-size: 1.25rem;
}

.presentation-date .date-day:first-child {
    font-size: 1.5rem;
}

.date-month {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.presentation-content {
    flex: 1;
}

.presentation-session {
    font-size: 0.875rem;
    color: var(--accent-blue);
    font-weight: 500;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.presentation-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.4;
}

.presentation-details {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
}

.detail-item {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 300;
    padding: 0.5rem 1rem;
    background-color: rgba(100, 255, 218, 0.05);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: 4px;
}

.presentation-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    gap: 0.5rem;
    margin-top: 1rem;
}

.presentation-link:hover {
    color: var(--text-primary);
    gap: 0.75rem;
}

.presentation-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.presentation-link:hover::after {
    transform: translateX(4px);
}

/* Publications Section */
.publications-section {
    position: relative;
    background-color: var(--bg-primary);
    padding: 8rem 0;
    z-index: 10;
}

.publications-list {
    max-width: 900px;
    margin: 0 auto;
    margin-top: 3rem;
}

.publication-card {
    background-color: rgba(30, 58, 95, 0.3);
    border: 1px solid rgba(100, 255, 218, 0.1);
    padding: 2.5rem;
    border-radius: 8px;
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(40px);
    backdrop-filter: blur(10px);
    margin-bottom: 2rem;
}

.publication-card.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.publication-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
    box-shadow: 0 8px 24px rgba(100, 255, 218, 0.15);
    background-color: rgba(30, 58, 95, 0.5);
}

.publication-year {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-blue);
    background-color: rgba(100, 255, 218, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.publication-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.4;
}

.publication-authors {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 300;
    line-height: 1.6;
}

.publication-authors strong {
    color: var(--accent-blue);
    font-weight: 500;
}

.publication-venue {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-weight: 300;
    font-style: italic;
    line-height: 1.6;
}

.publication-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.keyword {
    font-size: 0.8rem;
    color: var(--accent-blue);
    background-color: rgba(100, 255, 218, 0.1);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    font-weight: 400;
    border: 1px solid rgba(100, 255, 218, 0.2);
}

.publication-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    gap: 0.5rem;
}

.publication-link:hover {
    color: var(--text-primary);
    gap: 0.75rem;
}

.publication-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.publication-link:hover::after {
    transform: translateX(4px);
}

/* Events Section */
.events-section {
    position: relative;
    background-color: var(--bg-secondary);
    padding: 8rem 0;
    z-index: 10;
}

.events-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.event-preview-card {
    background-color: rgba(30, 58, 95, 0.3);
    border: 1px solid rgba(100, 255, 218, 0.1);
    padding: 2.5rem;
    border-radius: 8px;
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(40px);
    backdrop-filter: blur(10px);
}

.event-preview-card.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.event-preview-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-blue);
    box-shadow: 0 8px 24px rgba(100, 255, 218, 0.15);
    background-color: rgba(30, 58, 95, 0.5);
}

.event-preview-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.event-preview-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.event-preview-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 1.5rem;
}

.event-preview-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    gap: 0.5rem;
}

.event-preview-link:hover {
    color: var(--text-primary);
    gap: 0.75rem;
}

.event-preview-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.event-preview-link:hover::after {
    transform: translateX(4px);
}

/* Contact/Footer Section */
.contact-section {
    position: relative;
    background-color: var(--bg-primary);
    padding: 6rem 0 4rem;
    z-index: 10;
    border-top: 1px solid rgba(100, 255, 218, 0.1);
}

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

.contact-text {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-weight: 300;
    opacity: 0;
    transform: translateY(30px);
}

.contact-text.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.contact-link {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 400;
    font-size: 1rem;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    position: relative;
}

.contact-link.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.contact-link:nth-child(1) {
    transition-delay: 0.1s;
}

.contact-link:nth-child(2) {
    transition-delay: 0.2s;
}

.contact-link:nth-child(3) {
    transition-delay: 0.3s;
}

.contact-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-blue);
    transition: width 0.3s ease;
}

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

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

.footer-note {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 300;
    opacity: 0.7;
    margin-top: 2rem;
    opacity: 0;
    transform: translateY(20px);
}

.footer-note.animate-in {
    opacity: 0.7;
    transform: translateY(0);
    transition: opacity 0.6s ease 0.4s, transform 0.6s ease 0.4s;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .hero-content {
        padding: 1.5rem;
    }

    .about-section,
    .projects-section,
    .publications-section,
    .presentations-section,
    .expertise-section,
    .events-section {
        padding: 5rem 0;
    }

    .about-content {
        flex-direction: column;
        gap: 3rem;
        align-items: center;
    }

    .about-image-wrapper {
        width: 240px;
        height: 240px;
        order: -1;
    }

    .about-text-content {
        text-align: center;
    }

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

    .events-preview {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .project-card {
        padding: 2rem;
    }

    .publication-card {
        padding: 2rem;
    }

    .publication-title {
        font-size: 1.25rem;
    }

    .presentation-card {
        flex-direction: column;
        padding: 2rem;
    }

    .presentation-date {
        align-self: flex-start;
    }

    .presentation-title {
        font-size: 1.25rem;
    }

    .presentation-details {
        flex-direction: column;
        gap: 0.75rem;
    }

    .about-links {
        flex-direction: column;
    }

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

    .contact-links {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-text-overlay {
        min-height: 80px;
    }
}

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .overlay-text {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .publication-card {
        padding: 1.5rem;
    }

    .about-image-wrapper {
        width: 200px;
        height: 200px;
    }

    .publication-title {
        font-size: 1.1rem;
    }

    .publication-authors,
    .publication-venue {
        font-size: 0.9rem;
    }

    .presentation-card {
        padding: 1.5rem;
    }

    .presentation-title {
        font-size: 1.1rem;
    }

    .presentation-session {
        font-size: 0.8rem;
    }

    .detail-item {
        font-size: 0.8rem;
        padding: 0.4rem 0.75rem;
    }
}

/* Smooth scroll behavior */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}