:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --accent-color: #3b82f6;
}

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

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Sections */
section {
    padding: 5rem 0;
}

section:nth-child(even) {
    background-color: var(--bg-light);
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-color);
    text-align: center;
    position: relative;
    padding-bottom: 1rem;
}

h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

/* Hero Section */
.hero {
    margin-top: 4rem;
    padding: 6rem 0;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.profile-photo {
    flex-shrink: 0;
}

.profile-photo img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.hero-text {
    flex: 1;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.affiliation {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.bio {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    max-width: 800px;
}

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

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

.links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: background-color 0.2s;
    display: inline-block;
}

.btn:hover {
    background-color: var(--secondary-color);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Research Cards */
.research-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.research-card {
    padding: 2rem;
    background-color: var(--bg-color);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.research-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.research-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Publications */
.publication-category {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: 3rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.publication-category:first-child {
    margin-top: 0;
}

.publication {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
}

.publication:last-child {
    border-bottom: none;
}

.publication-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    line-height: 1.4;
    color: var(--text-color);
}

.publication-year-highlight {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.publication-authors {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

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

.publication-venue {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.publication-venue em {
    font-style: italic;
}

.publication-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

.publication-note {
    color: var(--text-light);
    font-size: 0.9rem;
    font-style: italic;
}

.publication-links {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.pub-link {
    padding: 0.4rem 1rem;
    background-color: var(--bg-light);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 0.375rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.pub-link:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Blog Section */
.section-intro {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    text-align: center;
}

.blog-list {
    display: grid;
    gap: 2rem;
}

.blog-post {
    padding: 2rem;
    background-color: var(--bg-color);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.blog-post:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.blog-post-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.blog-post-title a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s;
}

.blog-post-title a:hover {
    color: var(--primary-color);
}

.blog-post-date {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.blog-post-excerpt {
    color: var(--text-color);
    line-height: 1.7;
    margin-bottom: 1rem;
}

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

.blog-tag {
    padding: 0.3rem 0.75rem;
    background-color: var(--bg-light);
    color: var(--primary-color);
    border-radius: 1rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.read-more {
    color: var(--primary-color);
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.2s;
}

.read-more:hover {
    gap: 0.75rem;
}

.read-more::after {
    content: "→";
}

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

.timeline::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: -2.5rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 3px solid var(--bg-color);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.institution {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.timeline-content p {
    color: var(--text-light);
}

/* Contact */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.contact-item {
    padding: 1.5rem;
    background-color: var(--bg-color);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

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

.contact-item a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

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

    .profile-photo img {
        width: 200px;
        height: 200px;
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 1.25rem;
    }

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

    .blog-post {
        padding: 1.5rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .links {
        flex-direction: column;
    }
}