stylesheet.css

:root {
    --primary-color: #2563eb;
    --secondary-color: #e9428e;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --hover-bg: #f3f4f6;
    --max-width: 880px;
    --font-main: 'EB Garamond', 'Crimson Text', Georgia, serif;
    
    /* Unified font sizes */
    --font-large: 1.8rem;   /* Section titles */
    --font-medium: 1.15rem;  /* Subsection titles */
    --font-normal: 1.08rem;     /* Body text */
    --font-small: 1rem;    /* Secondary text, links */
}

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

body {
    font-family: var(--font-main);
    color: var(--text-primary);
    line-height: 1.65;
    background: var(--bg-primary);
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.nav-bar {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: 0.75rem 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

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

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

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header Section */
.header-section {
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2.5rem;
    align-items: center;
}

.name {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    color: var(--text-primary);
    font-family: var(--font-main);
}

.pronunciation {
    color: var(--text-secondary);
    font-size: var(--font-normal);
    margin-bottom: 0.3rem;
    font-style: italic;
    font-family: var(--font-main);
}

.chinese-name {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.contact-info {
    margin-bottom: 1rem;
    line-height: 1.6;
    font-size: var(--font-normal);
    font-family: var(--font-main);
}

.contact-info p {
    margin-bottom: 0.2rem;
}

.inline-logo {
    height: 0.9em;
    vertical-align: baseline;
    margin: 0 2px;
}

.ai2-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-main);
}

.highlight-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-family: var(--font-main);
}

.highlight-link:hover,
.ai2-link:hover {
    text-decoration: underline;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    transition: all 0.2s;
    background: var(--bg-secondary);
}

.social-links a:hover {
    background: var(--hover-bg);
    transform: translateY(-2px);
}

.social-links img {
    width: 20px;
    height: 20px;
}

.header-image img {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
}

/* Sections */
.section {
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.section-title {
    font-size: var(--font-large);
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-family: var(--font-main);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

/* About Section */
.about-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
    color: var(--text-primary); 
    font-size: var(--font-normal);
    font-family: var(--font-main);
}

/* Inline research focus with icons */
.research-focus-inline {
    font-family: var(--font-main);
    font-size: var(--font-normal);
    line-height: 1.8;
    color: var(--text-primary);  
    margin-bottom: 1rem;
}

/* Research Areas */
.research-text p {
    color: var(--text-primary); 
    margin: 0;
    font-size: var(--font-normal);
    display: inline;
    font-family: var(--font-main);
}

/* Force darker text in About section */
#about .about-content p {
    color: var(--text-primary) !important;  /* Force dark color */
}

#about .research-focus-inline {
    color: var(--text-primary) !important;  /* Force dark color */
}

/* Also update research items if they're still light */
#about .research-text p {
    color: var(--text-primary) !important;
}

.inline-research-icon {
    width: 18px;
    height: 18px;
    margin-right: 3px;
    margin-bottom: -2px;
    display: inline-block;
    vertical-align: text-bottom;
}

.research-aspect strong {
    color: var(--primary-color);
    font-weight: 600;
    font-family: var(--font-main);
    vertical-align: baseline;
}

/* Research Areas */
.research-areas {
    margin-top: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.research-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    align-items: flex-start;
}

.research-item img {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    margin-top: 3px;
}

.research-text {
    flex: 1;
    line-height: 1.6;
}

.research-text h3 {
    font-size: var(--font-normal);
    font-weight: 600;
    color: var(--text-primary);
    display: inline;
    font-family: var(--font-main);
}

.research-text h3::after {
    content: ". ";
}

.research-text p {
    color: var(--text-secondary);
    margin: 0;
    font-size: var(--font-normal);
    display: inline;
    font-family: var(--font-main);
}

/* Publications */
.view-toggle {
    display: flex;
    gap: 0.5rem;
}

.view-toggle button {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-small);
    font-weight: 500;
    font-family: var(--font-main);
    transition: all 0.2s;
}

.view-toggle button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.view-toggle button:hover:not(.active) {
    background: var(--hover-bg);
}

.publication-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

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

.publication-image img,
.publication-image video {
    width: 100%;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.video-caption {
    text-align: center;
    font-size: var(--font-small);
    color: var(--text-secondary);
    margin-top: 0.3rem;
    font-style: italic;
    font-family: var(--font-main);
}

.publication-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.publication-title {
    font-size: var(--font-medium);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    font-family: var(--font-main);
}

.publication-title a {
    color: inherit;
    text-decoration: none;
}

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

.publication-authors {
    font-size: var(--font-normal);
    color: var(--text-secondary);
    line-height: 1.5;
    font-family: var(--font-main);
}

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

.publication-venue {
    font-size: var(--font-normal);
    color: var(--text-secondary);
    font-family: var(--font-main);
}

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

.award {
    color: #dc2626;
    font-weight: 600;
    margin-left: 0.3rem;
    font-size: var(--font-small);
}

/* Publication Links - Button Style with Icons (Smaller Height) */
.publication-links {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.publication-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.65rem;  /* Reduced vertical padding */
    background: var(--bg-secondary);
    border: none;
    border-radius: 16px;  /* Slightly smaller radius */
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.85rem;  /* Slightly smaller font */
    font-weight: 500;
    font-family: var(--font-main);
    transition: all 0.2s ease;
    line-height: 1.2;  /* Tighter line height */
}

.publication-links a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 3px 8px rgba(37, 99, 235, 0.2);
}

.publication-links a:hover .link-icon {
    filter: brightness(0) invert(1);
}

.link-icon {
    width: 14px;  /* Smaller icons */
    height: 14px;
    flex-shrink: 0;
    transition: filter 0.2s ease;
}

/* For image-based icons like arxiv */
.link-icon-img {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    transition: filter 0.2s ease;
}

.publication-links a:hover .link-icon-img {
    filter: brightness(0) invert(1);
}

/* Specific link type styling */
.publication-links a[href*="arxiv"] {
    border-color: #b31b1b20;
}

.publication-links a[href*="arxiv"]:hover {
    background: #b31b1b;
    border-color: #b31b1b;
}

.publication-links a[href*="github"] {
    border-color: #24292e20;
}

.publication-links a[href*="github"]:hover {
    background: #24292e;
    border-color: #24292e;
}

.publication-links a[href*="huggingface"] {
    border-color: #ff660020;
}

.publication-links a[href*="huggingface"]:hover {
    background: #ff6600;
    border-color: #ff6600;
}

.publication-links a[href*="youtube"],
.publication-links a[href*="video"] {
    border-color: #ff000020;
}

.publication-links a[href*="youtube"]:hover,
.publication-links a[href*="video"]:hover {
    background: #ff0000;
    border-color: #ff0000;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .publication-links {
        gap: 0.4rem;
    }
    
    .publication-links a {
        padding: 0.3rem 0.7rem;
        font-size: 0.85rem;
    }
    
    .link-icon,
    .link-icon-img {
        width: 13px;
        height: 13px;
    }
}

/* Expandable TL;DR */
.publication-tldr {
    font-size: var(--font-small);
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 5px;
    margin-top: 0.3rem;
    font-family: var(--font-main);
    position: relative;
}

.publication-tldr strong {
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: var(--font-small);
}

.tldr-content {
    position: relative;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.publication-tldr.collapsed .tldr-content {
    max-height: 1.6em;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.publication-tldr.expanded .tldr-content {
    max-height: none;
}

.publication-tldr.collapsed .tldr-content::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 60px;
    height: 1.6em;
    background: linear-gradient(to right, transparent, var(--bg-secondary) 50%);
    pointer-events: none;
}

.tldr-toggle {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2px 8px;
    font-size: var(--font-small);
    font-family: var(--font-main);
    color: var(--primary-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 3px;
    transition: all 0.2s;
}

.tldr-toggle:hover {
    background: var(--hover-bg);
    transform: translateY(-1px);
}

.toggle-icon {
    transition: transform 0.3s ease;
}

/* Education & Experience */
.education-item,
.experience-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
}

.institution-logo,
.company-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    flex-shrink: 0;
}

.education-details h3,
.experience-details h3 {
    font-size: var(--font-medium);
    font-weight: 600;
    margin-bottom: 0.2rem;
    font-family: var(--font-main);
}

.education-details h3 a,
.experience-details h3 a {
    color: var(--text-primary);
    text-decoration: none;
}

.education-details h3 a:hover,
.experience-details h3 a:hover {
    color: var(--primary-color);
}

.location {
    color: var(--text-secondary);
    font-size: var(--font-normal);
    margin-bottom: 0.5rem;
    font-family: var(--font-main);
}

.education-details li,
.experience-details li,
.position {
    font-size: var(--font-normal);
    font-family: var(--font-main);
    color: var(--text-secondary);
}

.date {
    color: var(--text-secondary);
    font-size: var(--font-small);
    font-family: var(--font-main);
}

.award {
    color: #dc2626;
    font-weight: 600;
    font-size: var(--font-normal);
    font-family: var(--font-main);
}

/* Teaching */
.teaching-list {
    background: var(--bg-secondary);
    border-radius: 6px;
    padding: 1.25rem;
}

.teaching-item h3 {
    font-size: var(--font-normal);
    font-weight: 600;
    margin-bottom: 0.2rem;
    color: var(--text-primary);
    font-family: var(--font-main);
}

.teaching-item p {
    margin-bottom: 0.15rem;
    font-size: var(--font-normal);
    font-family: var(--font-main);
}

.terms {
    color: var(--text-secondary);
    font-size: var(--font-small);
    font-family: var(--font-main);
}

/* Service */
.service-content {
    background: var(--bg-secondary);
    padding: 1.25rem;
    border-radius: 6px;
}

.service-content h3 {
    font-size: var(--font-normal);
    font-weight: 600;
    margin-bottom: 0.6rem;
    font-family: var(--font-main);
}

.service-list li {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-normal);
    font-family: var(--font-main);
}

/* Talks */
.talk-item {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-bottom: 1rem;
}

.talk-item h3 {
    font-size: var(--font-normal);
    font-weight: 600;
    margin-bottom: 0.2rem;
    font-family: var(--font-main);
}

.talk-venue {
    color: var(--text-secondary);
    font-size: var(--font-small);
    margin-bottom: 0.2rem;
    font-family: var(--font-main);
}

.talk-title {
    margin-bottom: 0.5rem;
    font-size: var(--font-normal);
    font-family: var(--font-main);
}

.talk-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-small);
    font-family: var(--font-main);
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

.footer p {
    color: var(--text-secondary);
    font-size: var(--font-small);
    font-family: var(--font-main);
}

/* Mobile Responsive Design - Improved */
@media (max-width: 768px) {
    :root {
        /* Adjust font sizes for mobile */
        --font-large: 1.5rem;
        --font-medium: 1.1rem;
        --font-normal: 1rem;
        --font-small: 0.9rem;
    }
    
    body {
        font-size: 16px;
    }
    
    .container {
        padding: 0 1.25rem;
    }
    
    .nav-bar {
        padding: 0.6rem 0;
    }
    
    .nav-links {
        gap: 1rem;
        padding: 0 0.5rem;
    }
    
    /* Stack header on mobile */
    .header-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }
    
    .header-image {
        order: -1;
    }
    
    .header-image img {
        width: 180px;
        height: 180px;
        margin: 0 auto;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .social-links {
        justify-content: center;
        gap: 0.6rem;
    }
    
    .social-links a {
        width: 40px;
        height: 40px;
    }
    
    /* Sections */
    .section {
        padding: 2rem 0;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    /* Publications on mobile */
    .publication-item {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-bottom: 2.5rem;
        padding-bottom: 2.5rem;
    }
    
    .publication-image {
        max-width: 250px;
        margin: 0 auto;
    }
    
    .publication-tldr {
        padding-bottom: 2.5rem;
    }
    
    .tldr-toggle {
        bottom: 0.5rem;
        right: 0.5rem;
    }
    
    /* Research items stack on mobile */
    .research-item {
        flex-direction: column;
        text-align: left;
    }
    
    .research-item img {
        margin: 0;
    }
    
    /* Education/Experience stack */
    .education-item,
    .experience-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 1.25rem;
    }
    
    .education-details ul,
    .experience-details ul {
        text-align: left;
        max-width: 100%;
    }
    
    /* Teaching/Service/Talks */
    .teaching-list,
    .service-content,
    .talk-item {
        padding: 1rem;
    }
    
    /* Improved touch targets */
    .publication-links a,
    .talk-link,
    .nav-links a {
        padding: 0.25rem 0;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }
    
    .view-toggle button {
        min-height: 44px;
        padding: 0.6rem 1.2rem;
    }
}

@media (max-width: 480px) {
    :root {
        /* Even smaller fonts for very small screens */
        --font-large: 1.4rem;
        --font-medium: 1.05rem;
        --font-normal: 0.95rem;
        --font-small: 0.85rem;
    }
    
    body {
        font-size: 15px;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .name {
        font-size: 1.75rem;
    }
    
    .header-image img {
        width: 150px;
        height: 150px;
    }
    
    /* Single column navigation */
    .nav-links {
        font-size: var(--font-small);
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection Color */
::selection {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

/* Print styles */
@media print {
    .nav-bar,
    .view-toggle,
    .tldr-toggle {
        display: none;
    }
    
    .publication-tldr.collapsed .tldr-content {
        max-height: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}