/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Refined Palette */
    --color-primary: #2c3e50;
    --color-secondary: #34495e;
    --color-accent: #5a7fa5;
    --color-text: #2c2c2c;
    --color-text-light: #6c6c6c;
    --color-background: #fafafa;
    --color-white: #ffffff;
    --color-border: #e8e8e8;
    --color-hover: #f5f5f5;
    
    /* Typography */
    --font-serif: 'Crimson Text', Georgia, serif;
    --font-sans: 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.7;
    overflow-x: hidden;
    /* 启用硬件加速优化滚动性能 */
    -webkit-overflow-scrolling: touch;
    /* Removed transform that creates stacking context */
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-primary);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
    position: relative;
    background-color: var(--color-background);
    scroll-margin-top: 0;
}

.section.bg-light {
    background-color: var(--color-white);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-size: 2.5rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    margin: var(--spacing-sm) auto 0;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Navigation
   ======================================== */
#navbar {
    position: absolute;
    top: 0;
    width: 100%;
    background-color: transparent;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: none;
    z-index: 1000;
    transition: var(--transition-smooth);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 1.05rem;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-smooth);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 0;
    padding-bottom: var(--spacing-lg);
    overflow: hidden;
    scroll-margin-top: 0;
}

/* 背景图片层 */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('pic/BG.jpeg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transform: scale(1.02);
    z-index: 0;
}

/* 轻微的玻璃遮罩层 */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.42);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    animation: fadeInUp 1s ease;
    background: transparent;
    padding: var(--spacing-lg);
    border-radius: 20px;
}

.hero-image {
    flex: 0 0 280px;
}

.profile-photo {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-white);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.profile-photo:hover {
    transform: scale(1.02);
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 2.8rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    font-weight: 300;
    line-height: 1.5;
}

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

.hero-bio {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    text-align: justify;
}

.hero-social-icons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    margin-bottom: 1.5rem;
}

.icon-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-white);
    border: 2px solid var(--color-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.icon-link:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(73, 108, 164, 0.3);
}

.icon-link svg {
    width: 20px;
    height: 20px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: 1.5rem;
    margin-top: 1rem;
}

.tag {
    display: inline-block;
    padding: 0.4rem 0.9rem;
    background-color: var(--color-hover);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--color-accent);
    text-decoration: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    cursor: pointer;
}

.tag:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(73, 108, 164, 0.3);
}

/* ========================================
   About Section
   ======================================== */
.about-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.9;
    text-align: justify;
}

.about-content p {
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.about-content p:first-child {
    font-size: 1.15rem;
    color: var(--color-secondary);
    font-weight: 400;
}

.about-content strong {
    color: var(--color-primary);
    font-weight: 600;
}

.about-content em {
    color: var(--color-accent);
    font-style: italic;
}

/* ========================================
   Research Interests
   ======================================== */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.interest-card {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.interest-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.interest-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.interest-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.interest-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ========================================
   Technical Skills
   ======================================== */
.technical-skills {
    margin-top: 4rem;
}

.skills-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--color-primary);
    font-weight: 600;
}

.skills-grid {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    gap: 1.5rem;
}

.skill-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.skill-card h4 {
    color: var(--color-accent);
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.skill-card p {
    color: var(--color-text-light);
    margin: 0;
    font-size: 1rem;
    line-height: 1.6;
}

/* ========================================
   Timeline (Education)
   ======================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: var(--spacing-lg) auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 170px;
    top: 0;
    bottom: 0;
    width: 3px;
    background-color: var(--color-border);
}

.timeline-item {
    display: flex;
    margin-bottom: var(--spacing-lg);
    position: relative;
    opacity: 0;
    animation: fadeInRight 0.6s ease forwards;
}

.timeline-item:nth-child(1) {
    animation-delay: 0.1s;
}

.timeline-item:nth-child(2) {
    animation-delay: 0.2s;
}

.timeline-item:nth-child(3) {
    animation-delay: 0.3s;
}

.timeline-item:nth-child(4) {
    animation-delay: 0.4s;
}

.timeline-date {
    flex: 0 0 130px;
    font-weight: 600;
    color: var(--color-accent);
    padding-top: 5px;
    text-align: right;
    padding-right: 1.5rem;
}

.timeline-logo {
    flex: 0 0 80px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.timeline-logo img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 12px;
    background-color: #f8f9fa;
    padding: 8px;
}

.uoe-crest-frame {
    position: relative;
    width: 80px;
    height: 80px;
    overflow: hidden;
    flex: none;
    border-radius: 12px;
    background-color: #f8f9fa;
}

.timeline-logo .uoe-crest {
    position: absolute;
    top: 50%;
    left: 50%;
    width: auto;
    height: calc(100% - 12px);
    max-width: none;
    object-fit: contain;
    padding: 0;
    border-radius: 0;
    background: transparent;
    transform: translate(-50%, -50%);
}

.logo-placeholder {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
}

.timeline-content {
    flex: 1;
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-left: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    position: relative;
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.institution {
    color: var(--color-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.description {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   Publications
   ======================================== */
.filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.filter-btn {
    padding: 0.6rem 1.5rem;
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: 25px;
    color: var(--color-text);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-family: var(--font-sans);
}

.filter-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-btn.active {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-smooth);
    opacity: 1;
}

.publication-item.hidden {
    display: none;
}

.publication-item:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.pub-year {
    flex: 0 0 60px;
    font-weight: 700;
    color: var(--color-accent);
    font-size: 1.1rem;
}

.pub-content {
    flex: 1;
}

.pub-title {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
    font-weight: 600;
}

.pub-authors {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 0.3rem;
}

.pub-journal {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.pub-tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background-color: #e3f2fd;
    color: #1976d2;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.pub-tag.in-prep {
    background-color: #fff3e0;
    color: #f57c00;
}

.pub-tag.presentation {
    background-color: #f3e5f5;
    color: #7b1fa2;
}

.pub-tag.poster {
    background-color: #e8f5e9;
    color: #2e7d32;
}

/* ========================================
   Conferences
   ======================================== */
.conference-list {
    max-width: 1000px;
    margin: 0 auto;
}

.conference-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: 12px;
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: var(--transition-smooth);
    overflow: hidden;
}

.conference-item:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-3px);
}

.conference-image {
    flex: 0 0 220px;
    height: 180px;
    overflow: hidden;
    border-radius: 8px;
}

.conference-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.conference-item:hover .conference-image img {
    transform: scale(1.05);
}

.conference-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.conference-year {
    display: inline-block;
    font-weight: 700;
    color: var(--color-accent);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    margin-right: 0.5rem;
}

.conference-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.conference-status.upcoming {
    background-color: #fef3c7;
    color: #92400e;
}

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

.conference-title {
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.conference-authors {
    color: var(--color-text);
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

.conference-venue {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    font-style: italic;
}

/* ========================================
   Awards
   ======================================== */
.awards-list {
    max-width: 900px;
    margin: 0 auto;
}

.award-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-smooth);
}

.award-item:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateX(5px);
}

.award-year {
    flex: 0 0 80px;
    font-weight: 700;
    color: var(--color-accent);
    font-size: 1.2rem;
}

.award-content {
    flex: 1;
}

.award-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.award-org {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.award-badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.award-badge.scholarship {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.award-badge.academic {
    background-color: #e3f2fd;
    color: #1565c0;
}

.award-badge.competition {
    background-color: #fff3e0;
    color: #e65100;
}

/* ========================================
   Photography Section
   ======================================== */
.photo-section-header {
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.photo-section-header:first-of-type {
    margin-top: 2rem;
}

.photo-section-header h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    text-align: center;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.5rem;
}

.photo-section-header h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
    border-radius: 2px;
}

.photo-grid-2col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.photo-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    cursor: pointer;
    aspect-ratio: 4/3;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.photo-item:hover img {
    transform: scale(1.1);
}

.photo-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.photo-item:hover .photo-overlay {
    opacity: 1;
}

.photo-caption {
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

/* View More Button */
.view-more-btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
    color: white;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(107, 114, 128, 0.3);
    transition: all 0.3s ease;
}

.view-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(107, 114, 128, 0.5);
    background: linear-gradient(135deg, #4b5563 0%, #374151 100%);
    color: white;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 2000;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    animation: fadeIn 0.3s ease;
}

.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-content {
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    animation: zoomIn 0.3s ease;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: var(--color-white);
    font-size: 3rem;
    font-weight: 300;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.lightbox-close:hover {
    color: var(--color-accent);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    border: none;
    font-size: 2rem;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.lightbox-prev:hover,
.lightbox-next:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

.lightbox-caption {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-white);
    font-size: 1.2rem;
    text-align: center;
}

/* ========================================
   Experience Section
   ======================================== */
.experience-category {
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-hover);
    font-weight: 600;
}

.experience-category:first-of-type {
    margin-top: 2rem;
}

.experience-list {
    max-width: 900px;
    margin: 0 auto;
}

.experience-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-smooth);
}

.experience-item:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.exp-logo {
    flex: 0 0 60px;
    display: flex;
    align-items: flex-start;
}

.exp-logo img {
    width: 60px;
    height: 60px;
    object-fit: contain;
    border-radius: 8px;
}

.exp-content {
    flex: 1;
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.exp-header h3 {
    font-size: 1.3rem;
    color: var(--color-primary);
}

.exp-period {
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.95rem;
}

.exp-org {
    color: var(--color-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.exp-projects {
    margin-top: 1rem;
}

.exp-project {
    margin-bottom: 1.5rem;
}

.exp-project:last-child {
    margin-bottom: 0;
}

.project-title {
    color: var(--color-primary);
    margin-bottom: 0.3rem;
    font-size: 1.05rem;
}

.project-desc {
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    font-style: italic;
}

.exp-description {
    list-style-position: inside;
    color: var(--color-text-light);
    line-height: 1.8;
}

.exp-description li {
    margin-bottom: 0.5rem;
    padding-left: var(--spacing-sm);
}

/* ========================================
   Contact Section
   ======================================== */
.contact-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-smooth);
}

.contact-item:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.contact-icon {
    font-size: 2.5rem;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-background);
    border-radius: 50%;
}

.contact-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    margin-top: 0.5rem;
}

.contact-item a {
    color: var(--color-accent);
    font-weight: 500;
    word-break: break-word;
    overflow-wrap: break-word;
}

.contact-item p {
    margin: 0;
    color: var(--color-text-light);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background-color: var(--color-white);
    border-radius: 50%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-smooth);
    color: var(--color-primary);
}

.social-link:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-md) 0;
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
}

.footer a {
    color: var(--color-accent);
}

.footer a:hover {
    color: var(--color-white);
}

.footer-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

.visitor-count {
    font-size: 0.9rem;
    margin-top: 0.8rem;
    opacity: 0.9;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
}

.visitor-count span {
    font-weight: 500;
}

#visitor-count-number {
    color: var(--color-accent);
    font-weight: 600;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes zoomIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Scroll-triggered fade-in */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .hero {
        min-height: calc(100vh - 2rem);
        min-height: calc(100svh - 2rem);
        padding-bottom: var(--spacing-sm);
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        padding: var(--spacing-md);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        transform: translateX(-100%);
        visibility: hidden;
        pointer-events: none;
        transition: transform 0.3s ease;
    }

    .nav-menu.active {
        transform: translateX(0);
        visibility: visible;
        pointer-events: auto;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md);
        background: rgba(255, 255, 255, 0.9);
    }

    .hero-image {
        flex: 0 0 150px;
        margin-top: 60px;
    }

    .profile-photo {
        width: 150px;
        height: 150px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-tags {
        justify-content: center;
    }

    .hero-bio {
        font-size: 0.9rem;
        line-height: 1.6;
        text-align: left;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column;
    }
    
    .timeline-date {
        text-align: left;
        padding-right: 0;
    }
    
    .timeline-logo {
        margin-left: 0;
        margin-top: 1rem;
    }

    .timeline-content {
        margin-left: 50px;
    }

    .publication-item,
    .award-item,
    .conference-item {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .conference-image {
        flex: 0 0 auto;
        height: 200px;
        width: 100%;
    }

    .pub-year,
    .award-year {
        flex: 0 0 auto;
    }
    
    .exp-logo {
        flex: 0 0 50px;
    }

    .photo-grid-2col {
        grid-template-columns: 1fr;
    }
    
    .hero-social-icons {
        justify-content: center;
    }
    
    .social-links {
        flex-wrap: wrap;
    }
    
    .timeline-logo {
        flex: 0 0 60px;
    }
    
    .timeline-logo img,
    .logo-placeholder,
    .uoe-crest-frame {
        width: 60px;
        height: 60px;
    }

    .lightbox-prev,
    .lightbox-next {
        padding: 0.5rem 1rem;
        font-size: 1.5rem;
    }

    .lightbox-prev {
        left: 10px;
    }

    .lightbox-next {
        right: 10px;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }
    
    /* 手机端联系方式改为竖向排列 */
    .contact-info {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-sm);
    }
    
    .contact-item {
        padding: var(--spacing-md);
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .interests-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    #navbar,
    .nav-toggle,
    .filter-buttons,
    .lightbox,
    .social-links,
    .back-to-top {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }

    body {
        background-color: white;
    }
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 999;
}

.back-to-top:hover {
    background-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* ========================================
   Side Navigation (Fixed)
   ======================================== */
.side-nav {
    position: fixed !important;
    left: 30px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    z-index: 9999 !important;
    pointer-events: auto;
    isolation: isolate;
}

.side-nav-link {
    color: #999;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 300;
    font-family: 'Crimson Text', serif;
    transition: all 0.3s ease;
    text-align: left;
    white-space: nowrap;
    letter-spacing: 0.5px;
    display: block;
}

.side-nav-link:hover {
    color: #4a90e2;
    transform: translateX(8px);
}

.side-nav-link.active {
    color: #2c2c2c;
    font-weight: 400;
    transform: translateX(8px);
}

/* Hide side nav on smaller screens */
@media (max-width: 1200px) {
    .side-nav {
        display: none;
    }
}

/* ========================================
   Accessibility & Motion Preferences
   ======================================== */
:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}