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

:root {
    --primary-color: #5b7c99;
    --secondary-color: #7a9ab8;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f8f9fa;
    --bg-section: #fafbfc;
    --border-color: #e5e7eb;
    --accent-light: #e8eef3;
}

body {
    font-family: 'Crimson Text', 'Georgia', 'Garamond', 'Times New Roman', serif;
    line-height: 1.7;
    color: var(--text-color);
    background: var(--bg-light);
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: white;
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

nav .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 1.05rem;
    transition: color 0.3s;
}

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

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

.menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-color);
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
main {
    margin-top: 70px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    padding: 3rem 2rem;
    background: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

section {
    margin-bottom: 4rem;
}

section h2 {
    font-size: 1.95rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    font-weight: 600;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

/* About Section */
.about-container {
    max-width: 900px;
    position: relative;
}

.about-content h1 {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    position: absolute;
    top: -20px;
    right: 0px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-light);
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s;
    border: 1px solid var(--border-color);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.social-links svg {
    width: 18px;
    height: 18px;
}

.about-container .bio {
    margin-top: 1.5rem;
}

.bio p {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    text-align: justify;
}

.bio p:last-child {
    margin-bottom: 0;
}

.bio a {
    color: var(--primary-color);
    text-decoration: none;
}

.bio a:hover {
    text-decoration: underline;
}

.research-videos {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.research-videos .video-wrapper {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.research-videos video {
    width: 100%;
    height: auto;
    display: block;
}

.research-videos .video-wrapper:nth-child(4) {
    grid-column: 1 / -1;
    width: 100%;
    margin: 1rem auto 0;
}

#research .research-videos {
    margin-bottom: 0;
}

/* Publications Section */
.publication-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid var(--border-color);
}

.publication-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.publication-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.publication-authors {
    color: var(--text-light);
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.publication-authors .me {
    font-weight: 600;
    color: var(--text-color);
}

.publication-venue {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.publication-links {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.publication-links a {
    font-size: 0.9rem;
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    transition: all 0.3s;
}

.publication-links a:hover {
    background: var(--primary-color);
    color: white;
}

/* News Section */
.news-item {
    margin-bottom: 1.25rem;
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1rem;
    font-size: 1.2rem;
}

.news-item:last-child {
    margin-bottom: 0;
}

.news-date {
    color: var(--text-light);
    font-weight: 600;
    font-size: 1.2rem;
}

.news-content {
    color: var(--text-color);
}

.news-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.news-content a:hover {
    text-decoration: underline;
}

/* Talks Section */
.talk-item {
    margin-bottom: 1.75rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid var(--border-color);
}

.talk-item:last-child {
    border-bottom: none;
}

.talk-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.talk-venue {
    color: var(--text-light);
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

.talk-date {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Teaching Section */
.teaching-item {
    margin-bottom: 1.5rem;
}

.teaching-item h3 {
    font-size: 1.05rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.teaching-role {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.teaching-semester {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Footer */
footer {
    width: 100%;
    padding: 1rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    background: white;
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 700px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        right: 0;
        width: auto;
        min-width: 200px;
        background: white;
        padding: 1rem;
        border: 1px solid var(--border-color);
        border-radius: 4px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        gap: 1rem;
        margin-top: 0.5rem;
        z-index: 1001;
    }

    nav ul.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

    .about-container {
        display: flex;
        flex-direction: column;
    }

    .about-container h1 {
        text-align: center;
        order: 2;
        margin-top: 0.5rem;
        margin-bottom: 1rem;
    }

    .social-links {
        position: static;
        justify-content: center;
        margin-top: 0;
        margin-bottom: 1.5rem;
        order: 1;
    }

    .about-container .bio {
        order: 3;
        margin-top: 0;
    }

    .news-item {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .research-videos {
        grid-template-columns: 1fr;
    }

    main {
        padding: 2rem 1.5rem;
    }
}