:root {
    --bg-color: #ffffff;
    --text-color: #212529;
    --accent-color: #0056b3;
    --secondary-text: #6c757d;
    --max-width: 850px;
    --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 1.6;
    font-size: 1.05rem;
    padding: 5rem 1.5rem;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

header {
    margin-bottom: 4rem;
}

header h1 {
    font-size: 3.5rem;
    font-weight: 300;
    letter-spacing: -1px;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.links {
    font-size: 1rem;
    color: var(--secondary-text);
    font-weight: 400;
}

.links a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

.links a:hover {
    color: #003d82;
    text-decoration: underline;
}

.separator {
    margin: 0 0.6rem;
    color: #dee2e6;
}

section {
    margin-bottom: 5rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
    display: table;
}

/* About Section */
.about-grid {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.about-text {
    flex: 1;
}

.profile-img {
    width: 280px;
    height: auto;
    max-height: 400px;
    object-fit: cover;
    object-position: top center;
    border-radius: 10px;
    filter: grayscale(10%);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.about-text p {
    margin-bottom: 1.25rem;
}

.interests {
    margin-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
}

.interests li {
    background: #f1f3f5;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: #495057;
    font-weight: 500;
}

/* News Section */
.news-list {
    list-style: none;
}

.news-item {
    display: flex;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #f1f3f5;
}

.news-year {
    width: 100px;
    flex-shrink: 0;
    font-weight: 700;
    color: var(--accent-color);
}

/* Research Section */
.project {
    margin-bottom: 3rem;
}

.project-title {
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.project-date {
    color: var(--secondary-text);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.project-desc {
    list-style-type: none;
}

.project-desc li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.2rem;
}

.project-desc li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Publications Section */
.pub-category {
    margin-top: 3rem;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    color: var(--secondary-text);
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
}

.publication {
    margin-bottom: 2rem;
}

.pub-title {
    font-weight: 700;
    display: block;
    margin-bottom: 0.25rem;
}

.author-self {
    font-weight: 700;
    color: var(--text-color);
}

.venue {
    font-style: italic;
    color: #495057;
}

.pub-links {
    margin-top: 0.5rem;
}

.pub-links a {
    font-size: 0.85rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

/* Research Interests */
.interest-item {
    margin-bottom: 2rem;
}

.interest-item h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.interest-item p {
    color: var(--secondary-text);
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .about-grid {
        flex-direction: column-reverse;
        gap: 2rem;
    }
    header h1 {
        font-size: 2.75rem;
    }
}