:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --sidebar-bg: #fff;
    --border-color: #eee;
}

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

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

.container {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    padding: 40px 30px;
    position: sticky;
    top: 0;
    height: 100vh;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile {
    text-align: center;
    margin-bottom: 40px;
}

.avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    transform: scale(1.2);
    margin-bottom: 20px;
    border: 3px solid var(--accent-color);
    overflow: hidden;
}

.sidebar h1 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    color: var(--primary-color);
}

.en-name {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 10px;
}

.title {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
}

.lang-switch {
    margin-top: 15px;
    font-size: 0.9rem;
    color: #888;
}

.lang-switch button {
    background: none;
    border: none;
    color: #888;
    cursor: pointer;
    padding: 0 5px;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.lang-switch button.active {
    color: var(--accent-color);
    font-weight: bold;
}

.lang-switch button:hover {
    color: var(--accent-color);
}

.social-links {
    margin-top: 20px;
}

.social-links a {
    color: #555;
    font-size: 1.5rem;
    margin: 0 10px;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--accent-color);
}

.sidebar nav {
    width: 100%;
}

.sidebar nav ul {
    list-style: none;
}

.sidebar nav ul li {
    margin-bottom: 15px;
}

.sidebar nav ul li a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    display: block;
    padding: 8px 15px;
    border-radius: 5px;
    transition: background 0.3s, color 0.3s;
}

.sidebar nav ul li a:hover {
    background-color: #f0f7ff;
    color: var(--accent-color);
}

/* Main Content Styles */
.content {
    flex: 1;
    padding: 60px 50px;
    background-color: #fff;
}

section {
    margin-bottom: 60px;
    scroll-margin-top: 40px;
}

h2 {
    font-size: 1.8rem;
    border-bottom: 2px solid var(--accent-color);
    display: inline-block;
    margin-bottom: 30px;
    padding-bottom: 5px;
    color: var(--primary-color);
}

p {
    margin-bottom: 15px;
    color: #444;
}

.hiring-box {
    background-color: #fff8e1;
    border-left: 5px solid #ffc107;
    padding: 15px 20px;
    margin: 25px 0;
    border-radius: 4px;
}

/* Timeline */
.timeline {
    border-left: 2px solid var(--border-color);
    padding-left: 30px;
    position: relative;
}

.timeline .item {
    margin-bottom: 30px;
    position: relative;
}

.timeline .item::before {
    content: "";
    width: 12px;
    height: 12px;
    background-color: var(--accent-color);
    border-radius: 50%;
    position: absolute;
    left: -37px;
    top: 6px;
}

.timeline .date {
    font-size: 0.9rem;
    color: #888;
    font-weight: bold;
}

.timeline h3 {
    font-size: 1.1rem;
    margin: 5px 0;
}

/* Publications */
.pub-item {
    margin-bottom: 35px;
    display: flex;
    gap: 20px;
    padding-bottom: 25px;
    border-bottom: 1px solid #f1f1f1;
}

.pub-img {
    flex-shrink: 0;
}

.pub-img img {
    width: 200px;
    height: 120px;
    object-fit: contain;
    background-color: #fcfcfc;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.pub-info {
    flex: 1;
}

.pub-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1.1rem;
    line-height: 1.4;
}

.pub-authors {
    font-size: 0.95rem;
    color: #555;
    margin-bottom: 5px;
}

.pub-venue {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-style: italic;
    margin-bottom: 10px;
}

.pub-links {
    margin-top: 10px;
}

.pub-links a {
    text-decoration: none;
    font-size: 0.85rem;
    color: #666;
    background: #f8f9fa;
    padding: 4px 12px;
    border-radius: 4px;
    border: 1px solid #ddd;
    margin-right: 8px;
    transition: all 0.3s;
    display: inline-block;
}

.pub-links a:hover {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

.bibtex {
    display: none;
    background-color: #f4f4f4;
    padding: 15px;
    font-family: monospace;
    font-size: 0.8rem;
    white-space: pre-wrap;
    border-radius: 4px;
    margin-top: 15px;
    border-left: 3px solid var(--accent-color);
    color: #333;
}

.more-link {
    display: inline-block;
    margin-top: 10px;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}

.more-link:hover {
    text-decoration: underline;
}

/* Honors */
.honor-list {
    list-style: none;
}

.honor-list li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
}

.honor-list .year {
    background-color: #eee;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-right: 15px;
    min-width: 50px;
    text-align: center;
    color: #666;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px;
    background-color: var(--primary-color);
    color: #fff;
}

/* Language Toggle Visibility */
.lang-en .zh { display: none !important; }
.lang-zh .en { display: none !important; }

/* Mobile Responsive */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 40px 20px;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .content {
        padding: 40px 20px;
    }
    .pub-item {
        flex-direction: column;
    }
    .pub-img img {
        width: 100%;
        height: auto;
    }
}