/* Font Loading Performance */
@font-face {
    font-family: 'Inter';
    src: url('https://fonts.gstatic.com/s/inter/v12/UcC03FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2') format('woff2');
    font-weight: 400 700;
    font-display: swap;
}

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

/* Typography */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #1a1a1a;
    background: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 {
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: 3rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

p {
    color: #4a4a4a;
}

a {
    color: #0066cc;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.7;
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid #e5e5e5;
}

nav {
    padding: 1.5rem 0;
}

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

.logo {
    font-weight: 600;
    font-size: 1.125rem;
    color: #1a1a1a;
}

.nav-links {
    display: flex;
    gap: 3rem;
}

.nav-links a {
    color: #4a4a4a;
    font-weight: 500;
}

/* Hero */
.hero {
    padding: 12rem 2rem 6rem;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-content h1 {
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.375rem;
    line-height: 1.6;
    color: #4a4a4a;
    margin-bottom: 2rem;
    font-weight: 400;
}

@media (min-width: 769px) {
    .hero-subtitle {
        white-space: nowrap;
    }
}

.hero-meta {
    font-size: 1rem;
    color: #6a6a6a;
}

/* Sections */
main {
    margin-top: 0;
}

section {
    padding: 5rem 0;
    border-bottom: 1px solid #e5e5e5;
}

section:last-of-type {
    border-bottom: none;
}

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

/* Research */
.research-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
}

.research-item h3 {
    margin-bottom: 0.75rem;
}

.research-item p {
    line-height: 1.7;
}

/* Publications */
.pub-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-bottom: 3rem;
}

.pub-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.pub-authors {
    font-size: 0.95rem;
    color: #6a6a6a;
    margin-bottom: 0.25rem;
}

.pub-venue {
    font-size: 0.95rem;
    color: #6a6a6a;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.pub-link {
    font-size: 0.95rem;
}

.view-all {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 500;
}

/* Team */
.team-member {
    margin-bottom: 3rem;
}

.member-role {
    color: #4a4a4a;
    margin-bottom: 0.5rem;
}

.member-affiliation {
    color: #6a6a6a;
    margin-bottom: 1rem;
    line-height: 1.7;
}

.member-links {
    font-size: 0.95rem;
}

.separator {
    color: #d0d0d0;
    margin: 0 0.5rem;
}

.join-section {
    background: #f8f8f8;
    padding: 2.5rem;
    border-radius: 8px;
    text-align: center;
}

.join-section p {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.join-link {
    font-weight: 500;
}

/* News */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.news-item {
    display: flex;
    gap: 2rem;
    align-items: baseline;
}

.news-item time {
    color: #6a6a6a;
    font-size: 0.95rem;
    min-width: 60px;
}

.news-item h3 {
    font-size: 1.125rem;
    font-weight: 500;
    margin: 0;
}

/* Talks */
.talks-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.talk-item {
    display: flex;
    gap: 3rem;
    align-items: baseline;
}

.talk-item time {
    color: #6a6a6a;
    font-size: 0.95rem;
    min-width: 120px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.talk-content {
    flex: 1;
}

.talk-content h3 {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.talk-venue {
    font-size: 0.95rem;
    color: #4a4a4a;
    font-style: normal;
    font-weight: 500;
}

/* Contact */
.contact-name {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.name-cv-link {
    color: #0066cc;
    text-decoration: none;
    transition: opacity 0.2s ease;
    font-weight: 600;
    font-size: 2rem;
}

.name-cv-link:hover {
    opacity: 0.7;
}

h2 .name-cv-link {
    font-size: inherit;
    font-weight: inherit;
}

h3 .name-cv-link {
    font-size: inherit;
    font-weight: inherit;
}

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

/* Teaching */
.teaching-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.course h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.course-list {
    list-style: none;
    padding: 0;
}

.course-list li {
    padding: 0.5rem 0;
    color: #4a4a4a;
    line-height: 1.6;
}

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

.contact-location h3 {
    margin-bottom: 1rem;
}

address {
    font-style: normal;
    line-height: 1.8;
    color: #4a4a4a;
}

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 1px solid #e5e5e5;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
    color: #6a6a6a;
    font-size: 0.95rem;
}

/* Publications Page */
.publications-page {
    padding: 8rem 2rem 5rem;
}

.publications-page h1 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.pub-note {
    font-size: 0.9rem;
    color: #0066cc;
    font-weight: 500;
    margin-top: 0.5rem;
}

/* Active nav link */
.nav-links a.active {
    color: #1a1a1a;
    font-weight: 600;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    left: 0;
    top: 0;
    width: auto;
    height: auto;
    background: #fff;
    padding: 0.75rem 1rem;
    border: 2px solid #000;
    z-index: 10000;
}

/* Mobile menu button */
.mobile-menu-button {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 4px;
}

.mobile-menu-button span {
    display: block;
    width: 24px;
    height: 2px;
    background: #1a1a1a;
    transition: all 0.3s ease;
}

.mobile-menu-button.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-button.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-button.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Responsive */
@media (max-width: 768px) {
    .mobile-menu-button {
        display: flex;
    }
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero {
        padding: 10rem 1.5rem 4rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        font-size: 1.25rem;
        z-index: 999;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-button.active {
        z-index: 1001;
    }
    
    .research-areas {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .news-item {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .talk-item {
        flex-direction: column;
        gap: 0.5rem;
    }
}

    
    .publications-page {
        padding: 6rem 1rem 3rem;
    }
    
    .section-container {
        padding: 0 1rem;
    }
    
    .pub-item h3 {
        font-size: 1rem;
    }
    
    .pub-authors, .pub-venue {
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    section {
        padding: 3rem 0;
    }
    
    .hero {
        padding: 8rem 1rem 3rem;
    }
    
    .research-item h3 {
        font-size: 1.125rem;
    }
    
    .research-item p {
        font-size: 0.95rem;
    }
}