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

:root {
    --primary-color: #000000;
    --primary-hover: #333333;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-light: #8a8a8a;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --border-color: #d0d0d0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 重置默认链接样式，只对特定链接类应用蓝色 */
a {
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Navigation */
.header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
    background: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

.nav {
    display: flex;
    gap: 30px;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
}

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

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

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

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

/* Main Wrapper */
.main-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 60px;
    padding-bottom: 60px;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
    align-self: start;
}

.profile {
    margin-bottom: 30px;
}

.profile-name {
    margin-bottom: 15px;
}

.name {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
    letter-spacing: -0.5px;
}

.name-zh {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.profile-title {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.department {
    margin-top: 5px;
    color: var(--text-light);
    font-size: 13px;
}

.profile-image {
    margin: 30px 0;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    background: var(--bg-secondary);
}

.profile-image:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.profile-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
}

.profile-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 30px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 8px;
    transition: var(--transition);
    background: var(--bg-secondary);
}

.link-item:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

.link-item:hover .icon {
    fill: white;
}

.link-item .icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    fill: currentColor;
    transition: var(--transition);
}

/* Main Content */
.content {
    max-width: 700px;
}

.section {
    margin-bottom: 50px;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title .icon {
    font-size: 24px;
    opacity: 0.8;
}

.section-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 15px;
}

.intro-text {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 15px;
}

.text-link {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.text-link:hover {
    border-bottom-color: #2563eb;
    color: #1d4ed8;
}

/* News Section */
.news-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.news-item {
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border-left: 3px solid var(--border-color);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease-out;
    position: relative;
}

.news-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
    background: #fafafa;
}

.news-date {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
    display: inline-block;
    margin-right: 10px;
    min-width: 110px;
}

.news-content {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 15px;
}

/* Publications Section */
.note {
    color: var(--text-light);
    font-size: 13px;
    font-style: italic;
    margin-bottom: 25px;
}

.publications {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.publication-card {
    padding: 25px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease-out;
}

.publication-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-color);
    background: #fafafa;
}

.paper-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.paper-link {
    color: #2563eb;
    text-decoration: none;
    transition: var(--transition);
}

.paper-link:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

.paper-authors {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 8px;
}

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

/* Timeline Styles */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 30px;
    position: relative;
    padding-left: 30px;
}

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

.timeline-item {
    display: flex;
    gap: 30px;
    position: relative;
    padding-left: 20px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -35px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-year {
    min-width: 120px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
    padding-top: 2px;
}

.timeline-content {
    flex: 1;
}

.timeline-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.timeline-org {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 5px;
    font-weight: 500;
}

.timeline-desc {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* Awards Styles */
.awards-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.award-item {
    display: flex;
    gap: 25px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease-out;
}

.award-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-color);
    background: #fafafa;
}

.award-year {
    min-width: 60px;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 16px;
    padding-top: 2px;
}

.award-content {
    flex: 1;
}

.award-content strong {
    display: block;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 5px;
}

.award-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 0;
}

.paper-venue {
    color: var(--text-light);
    font-size: 13px;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 968px) {
    .main-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .sidebar {
        position: static;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-image {
        width: 200px;
        margin: 20px auto;
    }

    .profile-links {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .link-item {
        flex: 1;
        min-width: 120px;
        justify-content: center;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 15px;
    }

    .header {
        padding: 15px 0;
    }

    .nav {
        gap: 20px;
        flex-wrap: wrap;
    }

    .nav-link {
        font-size: 14px;
    }

    .name {
        font-size: 24px;
    }

    .section-title {
        font-size: 20px;
    }

    .news-date {
        display: block;
        margin-bottom: 8px;
        min-width: auto;
    }

    .publication-card {
        padding: 20px;
    }

    .paper-title {
        font-size: 16px;
    }
}

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

/* Selection Color */
::selection {
    background: var(--primary-color);
    color: white;
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e5e5e5;
        --text-secondary: #b0b0b0;
        --text-light: #808080;
        --bg-primary: #1a1a1a;
        --bg-secondary: #252525;
        --border-color: #404040;
    }
    
    body {
        background: var(--bg-primary);
    }
    
    .header {
        background: rgba(26, 26, 26, 0.9);
        border-bottom-color: var(--border-color);
    }
    
    .timeline-item::before {
        border-color: var(--bg-primary);
    }
}