/* 全局样式 - 参考 Andrew Ng 网站 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 极简配色方案 */
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-dark: #2c3e50;
    --text-medium: #555;
    --text-light: #7f8c8d;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e1e4e8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.8;
    color: var(--text-dark);
    background-color: var(--bg-white);
    font-size: 16px;
}

.container {
    max-width: 95%;
    margin: 0 auto;
    padding: 0 30px;
}

/* 主内容区左右布局 */
.main-content-section {
    padding: 60px 0;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

/* 左侧导师栏 */
.leader-column {
    position: sticky;
    top: 100px;
}

.about-content-vertical {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 30px;
    align-items: center;
}

.about-image {
    width: 100%;
}

.about-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.about-text-compact h3 {
    font-size: 2.2rem;
    color: var(--text-dark);
    margin: 0 0 15px 0;
    font-weight: 800;
    line-height: 1.5;
}

.about-text-compact .position {
    color: var(--accent-color);
    font-size: 1.1rem;
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.8;
}

.about-text-compact .affiliation {
    color: var(--text-dark);
    font-size: 1rem;
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.9;
}

.honors-text {
    margin: 0;
}

.honors-text p {
    color: var(--text-dark);
    font-size: 0.95rem;
    line-height: 2;
    font-weight: 600;
    margin: 0;
}

/* 响应式：小屏幕改为上下布局 */
@media (max-width: 768px) {
    .about-content-vertical {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .about-image {
        max-width: 200px;
        margin: 0 auto;
    }
}

/* 学术兼职横跨整个宽度 */
.academic-positions-full {
    margin-top: 30px;
}

.positions-title-full {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
    font-weight: 600;
}

.positions-grid-full {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.position-item-full {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background: var(--bg-light);
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
    transition: all 0.3s ease;
}

.position-item-full:hover {
    background: #f0f4ff;
    transform: translateX(3px);
}

.position-item-full .position-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.position-item-full .position-text {
    font-size: 0.88rem;
    color: var(--text-dark);
    line-height: 1.4;
}

/* 响应式：小屏幕改为单列 */
@media (max-width: 768px) {
    .positions-grid-full {
        grid-template-columns: 1fr;
    }
}

/* 紧凑版学术兼职 */
.academic-positions-compact {
    margin-top: 25px;
}

.positions-title-compact {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent-color);
}

.positions-list-compact {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.position-item-compact {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-light);
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
    transition: all 0.3s ease;
}

.position-item-compact:hover {
    background: #f0f4ff;
    transform: translateX(3px);
}

.position-item-compact .position-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.position-item-compact .position-text {
    font-size: 0.86rem;
    color: var(--text-dark);
    line-height: 1.4;
}

/* 响应式：小屏幕改为单列 */
@media (max-width: 768px) {
    .positions-list-compact {
        grid-template-columns: 1fr;
    }
}

/* 右侧新闻栏 */
.news-column {
}

.news-grid-vertical {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 响应式：小屏幕改为上下布局 */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .leader-column {
        position: static;
    }
}

/* 学术兼职样式 */
.academic-positions {
    margin-top: 30px;
}

.positions-title {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

.positions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.position-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    background: var(--bg-light);
    border-radius: 8px;
    border-left: 3px solid var(--accent-color);
    transition: all 0.3s ease;
}

.position-item:hover {
    background: #f0f4ff;
    transform: translateX(5px);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
}

.position-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
}

.position-text {
    font-size: 0.92rem;
    color: var(--text-dark);
    line-height: 1.5;
}

/* 响应式：小屏幕改为单列 */
@media (max-width: 768px) {
    .positions-grid {
        grid-template-columns: 1fr;
    }
}

/* 导航栏 - 简洁风格 */
.navbar {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav-menu-centered {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    margin: 0;
    padding: 0;
}

.nav-menu-centered a {
    text-decoration: none;
    color: var(--text-medium);
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.2s ease;
    padding: 5px 0;
}

.nav-menu-centered a:hover,
.nav-menu-centered a.active {
    color: var(--accent-color);
}

.hamburger {
    display: none;
}

/* 响应式导航 */
@media (max-width: 768px) {
    .nav-menu-centered {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* 简洁页脚 */
.footer-minimal {
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 30px 0;
    margin-top: 60px;
}

.footer-content-minimal {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-minimal .copyright {
    color: var(--text-light);
    font-size: 0.9rem;
    margin: 0;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-links a {
    color: var(--text-medium);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

.footer-links span {
    color: var(--border-color);
}

/* 响应式页脚 */
@media (max-width: 768px) {
    .footer-content-minimal {
        gap: 10px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
}

/* 页头区域 - 极简风格 */
.header-banner {
    background: var(--bg-white);
    padding: 60px 0 40px;
    border-bottom: 1px solid var(--border-color);
}

.banner-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.banner-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 5px;
}

.banner-tagline {
    font-size: 0.95rem;
    color: var(--text-light);
    font-style: italic;
}

/* 通用区块样式 */
.section {
    padding: 60px 0;
}

.section-header {
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.section-divider {
    display: none;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 1rem;
    max-width: 100%;
}

/* 关于导师区块 */
.about-section {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
}

.about-content {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
    align-items: start;
}

.about-image img {
    width: 100%;
    border-radius: 8px;
}

.about-text h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-weight: 700;
}

.position {
    font-size: 0.95rem;
    color: var(--text-medium);
    margin-bottom: 5px;
}

.affiliation {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 30px;
}

.about-details {
    margin: 30px 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.about-details > div {
    background: transparent;
    padding: 0;
    border: none;
}

.about-details h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.about-details ul {
    list-style: none;
    padding-left: 0;
}

.about-details li {
    padding: 6px 0;
    padding-left: 18px;
    position: relative;
    color: var(--text-medium);
    line-height: 1.6;
    font-size: 0.95rem;
}

.about-details li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--text-light);
}

.mt-3 {
    margin-top: 1.5rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

.btn-outline {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background: transparent;
}

.btn-outline:hover {
    background: var(--accent-color);
    color: var(--bg-white);
}

/* 研究领域 - 简洁卡片 */
.research-highlights {
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.highlight-card {
    background: var(--bg-white);
    padding: 30px 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.highlight-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.highlight-icon {
    display: none;
}

.highlight-card h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 12px;
    font-weight: 600;
}

.highlight-card p {
    color: var(--text-medium);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 最新动态 - 类似 Publications 风格 */
.news-section {
    background: var(--bg-white);
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.news-card {
    background: var(--bg-white);
    padding: 25px 0;
    border-radius: 0;
    border-left: none;
    border-bottom: 1px solid var(--border-color);
    box-shadow: none;
    transition: all 0.2s ease;
}

.news-card:hover {
    background: var(--bg-light);
    box-shadow: none;
    transform: none;
    padding-left: 15px;
}

.news-date {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 8px;
    font-weight: 400;
}

.news-card h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.news-card p {
    color: var(--text-medium);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 10px;
}

.news-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.news-link:hover {
    color: var(--primary-color);
}

/* 带图片的新闻卡片 */
.news-card-with-image {
    display: flex;
    flex-direction: column;
}

.news-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 15px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.news-card-with-image:hover .news-image {
    transform: scale(1.02);
}

/* 统计数据 - 简化 */
.stats-section {
    background: var(--bg-light);
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: left;
}

.stat-item {
    padding: 0;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-medium);
}

/* 页脚 - 极简 */
.footer {
    background: var(--bg-white);
    color: var(--text-medium);
    padding: 40px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.footer-section h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.footer-section p,
.footer-section li {
    color: var(--text-medium);
    font-size: 0.9rem;
    margin-bottom: 8px;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li a {
    color: var(--text-medium);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
}

.footer-section i {
    margin-right: 8px;
    color: var(--text-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.85rem;
}

/* 响应式设计 */
@media (max-width: 968px) {
    .highlights-grid,
    .stats-grid,
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-image {
        max-width: 200px;
        margin: 0 auto;
    }
    
    .about-details {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
        flex-direction: column;
        cursor: pointer;
        gap: 4px;
    }
    
    .hamburger span {
        width: 25px;
        height: 2px;
        background: var(--text-dark);
        transition: all 0.3s ease;
    }
    
    .banner-content h1 {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .highlights-grid,
    .stats-grid,
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 20px;
    }
}
/* 2026 visual refinement and accessibility layer */
:root { --primary-color:#123f46; --secondary-color:#1c5960; --accent-color:#c58b3a; --text-dark:#17333a; --text-medium:#4f6469; --text-light:#71858a; --bg-light:#f4f8f8; --border-color:#dce8e8; }
html { scroll-behavior:smooth; }
body { background:linear-gradient(180deg,#f8fbfb 0,#fff 260px); color:var(--text-dark); }
.container { width:min(1180px,calc(100% - 32px)); max-width:1180px; padding-left:16px; padding-right:16px; }
.navbar { position:sticky; top:0; z-index:100; background:rgba(255,255,255,.94); border-bottom:1px solid rgba(220,232,232,.9); box-shadow:0 6px 24px rgba(18,63,70,.07); backdrop-filter:blur(12px); }
.navbar .container { min-height:68px; }
.nav-menu-centered a { color:var(--text-medium); font-weight:600; letter-spacing:.01em; }
.nav-menu-centered a:hover,.nav-menu-centered a.active { color:var(--primary-color); }
.nav-menu-centered a::after { background:var(--accent-color); height:2px; }
.section { padding-top:76px; padding-bottom:76px; }
.section:nth-of-type(even) { background:var(--bg-light); }
.section-header { margin-bottom:34px; }
.section-header h2 { color:var(--primary-color); font-weight:750; letter-spacing:-.02em; }
.section-header h2::after { background:var(--accent-color); }
.about-content,.highlight-card,.news-card,.position-item,.stat-item { border:1px solid var(--border-color); border-radius:16px; }
.about-content { background:rgba(255,255,255,.82); box-shadow:0 16px 40px rgba(18,63,70,.08); }
.highlight-card,.news-card,.position-item,.stat-item { background:#fff; box-shadow:0 8px 24px rgba(18,63,70,.06); transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease; }
.highlight-card:hover,.news-card:hover,.position-item:hover,.stat-item:hover { transform:translateY(-4px); border-color:#b7d2d1; box-shadow:0 16px 32px rgba(18,63,70,.12); }
.news-card h3 { color:var(--primary-color); }
.news-date { color:var(--accent-color); font-weight:700; }
.footer,.footer-minimal { background:#123f46; color:#e7f2f2; }
.footer-section h3,.footer-section h4 { color:#fff; }
.footer-section p,.footer-section li,.footer-section ul li a { color:#c7dada; }
.footer-section ul li a:hover { color:#f0c477; }
.footer-bottom { border-color:rgba(255,255,255,.18); color:#a9c1c3; }
.hamburger { border:0; background:transparent; padding:8px; }
.hamburger:focus-visible,a:focus-visible,button:focus-visible { outline:3px solid rgba(197,139,58,.55); outline-offset:3px; }
img { max-width:100%; height:auto; }
@media (max-width:768px) {
 .container { width:calc(100% - 16px); padding:0 8px; }
 .section { padding-top:54px; padding-bottom:54px; }
 .navbar .container { min-height:60px; }
 .nav-menu.active { display:flex; position:absolute; top:60px; left:8px; right:8px; flex-direction:column; gap:0; padding:8px; border:1px solid var(--border-color); border-radius:12px; background:#fff; box-shadow:0 14px 30px rgba(18,63,70,.14); }
 .nav-menu.active a { padding:11px 14px; border-radius:8px; }
 .nav-menu.active a:hover { background:var(--bg-light); }
 .hamburger { display:flex; }
}
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto!important; animation-duration:.01ms!important; transition-duration:.01ms!important; } }
/* Homepage structure refinement */
.main-content-section { padding: 72px 0 88px; }
.main-grid { grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); gap: 56px; align-items: start; }
.leader-column { position: static; min-width: 0; }
.about-content-vertical { grid-template-columns: 180px minmax(0, 1fr); gap: 28px; padding: 28px; background: #fff; border: 1px solid var(--border-color); border-radius: 18px; box-shadow: 0 14px 36px rgba(18,63,70,.08); align-items: start; }
.about-image img { aspect-ratio: 3 / 4; object-fit: cover; }
.about-text-compact h3 { font-size: clamp(2rem, 4vw, 2.7rem); letter-spacing: -.04em; }
.about-text-compact .position { font-size: 1rem; }
.about-text-compact .affiliation { font-size: .96rem; line-height: 1.7; }
.honors-text p { font-size: .92rem; line-height: 1.8; font-weight: 400; color: var(--text-medium); }
.academic-positions-full { margin-top: 34px; }
.positions-title-full { font-size: 1.45rem; margin-bottom: 18px; padding-bottom: 12px; }
.positions-grid-full { gap: 12px; }
.position-item-full { min-height: 52px; padding: 13px 16px; border: 1px solid var(--border-color); border-left: 3px solid var(--accent-color); border-radius: 10px; background: #fff; }
.position-item-full .position-text { font-size: .9rem; }
.news-column { min-width: 0; position: sticky; top: 94px; }
.news-column .section-header { display: flex; align-items: end; justify-content: space-between; margin-bottom: 20px; padding-bottom: 14px; border-bottom: 2px solid var(--accent-color); }
.news-column .section-header h2 { margin: 0; font-size: 1.55rem; }
.news-grid-vertical { display: grid; gap: 14px; }
.news-grid-vertical .news-card { padding: 20px 22px; border: 1px solid var(--border-color); border-radius: 14px; background: #fff; box-shadow: 0 8px 22px rgba(18,63,70,.06); }
.news-grid-vertical .news-card:hover { padding-left: 22px; transform: translateY(-3px); background: #fff; box-shadow: 0 14px 28px rgba(18,63,70,.11); }
.news-card h3 { font-size: 1rem; line-height: 1.65; }
.news-link { display: inline-flex; margin-top: 4px; }
@media (max-width: 900px) {
 .main-grid { grid-template-columns: 1fr; gap: 42px; }
 .news-column { position: static; }
}
@media (max-width: 600px) {
 .main-content-section { padding: 42px 0 58px; }
 .about-content-vertical { grid-template-columns: 1fr; padding: 20px; }
 .about-image { max-width: 180px; }
 .about-text-compact { text-align: left; }
 .positions-grid-full { grid-template-columns: 1fr; }
 .news-grid-vertical .news-card { padding: 18px; }
}