/* [COLORS] 修改主题色在这里 */
        :root {
            --primary: #1a365d;
            --primary-light: #2d4a7c;
            --accent: #c53030;
            --accent-light: #e53e3e;
            --bg: #fafafa;
            --text: #1a202c;
            --text-dim: #4a5568;
            --text-light: #718096;
            --border: #e2e8f0;
            --shadow: rgba(0,0,0,0.08);
            --glow: rgba(197,48,48,0.15);
        }
        * { margin:0; padding:0; box-sizing:border-box; }
        html { scroll-padding-top: 80px; }
        body { font-family:'Source Sans 3','Noto Serif SC',sans-serif; background:var(--bg); color:var(--text); line-height:1.7; overflow-x:hidden; }

        /* 背景动画 */
        .bg-animation { position:fixed; top:0; left:0; width:100%; height:100%; z-index:-1; background: radial-gradient(ellipse at 20% 30%,rgba(197,48,48,0.05),transparent 50%), radial-gradient(ellipse at 80% 70%,rgba(45,74,124,0.05),transparent 50%); }
        .bg-animation::before { content:''; position:absolute; width:500px; height:500px; background:radial-gradient(circle,rgba(197,48,48,0.08),transparent 70%); top:-250px; right:-250px; animation:float 25s ease-in-out infinite; }
        .bg-animation::after  { content:''; position:absolute; width:400px; height:400px; background:radial-gradient(circle,rgba(45,74,124,0.06),transparent 70%); bottom:-200px; left:-200px; animation:float 20s ease-in-out infinite reverse; }
        @keyframes float { 0%,100%{transform:translate(0,0) rotate(0deg)} 33%{transform:translate(80px,-80px) rotate(120deg)} 66%{transform:translate(-60px,60px) rotate(240deg)} }
        @keyframes fadeInUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }

        /* 导航栏 */
        header { padding:1.5rem 5%; display:flex; justify-content:space-between; align-items:center; background:rgba(255,255,255,0.95); backdrop-filter:blur(10px); border-bottom:1px solid var(--border); position:sticky; top:0; z-index:1000; box-shadow:0 2px 8px var(--shadow); }
        .logo { font-size:1.4rem; font-weight:700; color:var(--primary); font-family:'Playfair Display',serif; }
        .header-nav { display:flex; align-items:center; gap:2rem; }
        nav { display:flex; gap:0; }
        nav a { padding:0.5rem 1.2rem; color:var(--text-dim); text-decoration:none; transition:color 0.3s; font-size:0.95rem; font-weight:500; border-bottom:2px solid transparent; }
        nav a:hover { color:var(--accent); border-bottom-color:var(--accent); }
        .lang-switch { padding:0.4rem 1rem; background:var(--bg); border:1px solid var(--border); border-radius:20px; cursor:pointer; font-size:0.85rem; font-weight:600; color:var(--text-dim); transition:all 0.3s; }
        .lang-switch:hover { background:var(--accent); color:white; border-color:var(--accent); }
        .cv-download { padding:0.5rem 1.5rem; background:var(--accent); color:white; text-decoration:none; border-radius:25px; font-weight:600; font-size:0.9rem; transition:all 0.3s; box-shadow:0 2px 8px var(--glow); }
        .cv-download:hover { background:var(--accent-light); transform:translateY(-2px); }
        .menu-toggle { display:none; flex-direction:column; gap:5px; cursor:pointer; padding:0.5rem; background:none; border:none; z-index:1001; }
        .menu-toggle span { width:25px; height:3px; background:var(--primary); transition:all 0.3s; border-radius:3px; }
        .menu-toggle.active span:nth-child(1) { transform:rotate(45deg) translate(8px,8px); }
        .menu-toggle.active span:nth-child(2) { opacity:0; }
        .menu-toggle.active span:nth-child(3) { transform:rotate(-45deg) translate(7px,-7px); }

        /* Hero */
        .hero { min-height:75vh; display:grid; grid-template-columns:1fr 1fr; gap:4rem; align-items:center; padding:4rem 10%; position:relative; }
        .hero-content { animation:fadeInUp 1s ease-out; }
        .hero-image { display:flex; justify-content:center; align-items:center; animation:fadeInUp 1s ease-out 0.2s backwards; }
        .hero-image img { width:320px; height:320px; border-radius:50%; object-fit:cover; border:6px solid white; box-shadow:0 20px 60px var(--shadow),0 0 0 1px var(--border); transition:transform 0.3s; }
        .hero-image img:hover { transform:scale(1.05); }
        .hero h1 { font-size:3.5rem; font-weight:700; line-height:1.2; margin-bottom:1rem; color:var(--primary); font-family:'Playfair Display','Noto Serif SC',serif; }
        .hero .subtitle { font-size:1.4rem; color:var(--text-dim); margin-bottom:1rem; }
        .hero .tagline { font-size:1.2rem; color:var(--accent); font-style:italic; margin-bottom:2rem; }
        .motto { font-size:1rem; color:var(--text-light); border-left:3px solid var(--accent); padding-left:1.5rem; margin:2rem 0; font-style:italic; line-height:1.8; }
        .hero-bio { color:var(--text-dim); margin:2rem 0; line-height:1.8; }
        .social-links { display:flex; flex-wrap:wrap; gap:1rem; margin-top:2rem; }
        .social-links a { color:var(--text-dim); text-decoration:none; font-size:0.9rem; padding:0.6rem 1.2rem; border:1px solid var(--border); background:white; border-radius:25px; transition:all 0.3s; font-weight:500; }
        .social-links a:hover { border-color:var(--accent); color:var(--accent); transform:translateY(-2px); box-shadow:0 4px 12px var(--shadow); }

        /* Stats */
        .stats-section { padding:4rem 10%; background:white; }
        .stats-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:2rem; max-width:1100px; margin:0 auto; }
        .stat-card { background:var(--bg); padding:2.5rem 2rem; border-radius:15px; border:1px solid var(--border); text-align:center; transition:all 0.3s; }
        .stat-card:hover { transform:translateY(-5px); box-shadow:0 12px 24px var(--shadow); border-color:var(--accent); }
        .stat-number { font-size:3rem; font-weight:700; color:var(--accent); font-family:'JetBrains Mono',monospace; }
        .stat-label { font-size:0.9rem; color:var(--text-dim); margin-top:0.5rem; text-transform:uppercase; letter-spacing:1px; font-weight:600; }

        /* Section Title */
        .section-title { font-size:2.5rem; font-weight:700; margin-bottom:3rem; text-align:center; color:var(--primary); font-family:'Playfair Display','Noto Serif SC',serif; position:relative; }
        .section-title::after { content:''; display:block; width:80px; height:3px; background:var(--accent); margin:1rem auto 0; }

        /* 研究版图 */
        .research-section { padding:6rem 10%; }
        .research-grid { display:grid; gap:2rem; max-width:1100px; margin:0 auto; }
        .research-card { background:white; border-radius:16px; border:1px solid var(--border); overflow:hidden; transition:all 0.3s; }
        .research-card:hover { box-shadow:0 12px 32px var(--shadow); border-color:var(--accent); }
        .research-card-header { display:flex; align-items:flex-start; gap:1.2rem; padding:2rem; cursor:pointer; user-select:none; }
        .research-number { font-size:2rem; font-weight:700; color:var(--accent); font-family:'JetBrains Mono',monospace; line-height:1; min-width:2.5rem; padding-top:0.2rem; }
        .research-header-text { flex:1; }
        .research-title-zh { font-size:1.4rem; font-weight:700; color:var(--primary); font-family:'Noto Serif SC',serif; margin-bottom:0.2rem; }
        .research-title-en { font-size:0.95rem; color:var(--text-light); font-style:italic; }
        .research-toggle { font-size:1.2rem; color:var(--text-light); transition:transform 0.3s; padding-top:0.3rem; flex-shrink:0; }
        .research-toggle.open { transform:rotate(180deg); }
        .research-card-body { max-height:0; overflow:hidden; transition:max-height 0.4s ease-out; }
        .research-card-body.open { max-height:2000px; }
        .research-card-inner { padding:0 2rem 2rem 5rem; border-top:1px solid var(--border); }
        .research-desc-zh, .research-desc-en { color:var(--text-dim); line-height:1.9; margin:1.5rem 0 1.2rem 0; font-size:0.97rem; }
        .research-tags { display:flex; flex-wrap:wrap; gap:0.6rem; margin-top:1.2rem; }
        .tag { display:inline-flex; align-items:center; gap:0.35rem; padding:0.35rem 0.85rem; border-radius:20px; font-size:0.8rem; font-weight:600; font-family:'JetBrains Mono',monospace; white-space:nowrap; }
        .tag-published  { background:rgba(56,161,105,0.1);  color:#276749; border:1px solid rgba(56,161,105,0.3); }
        .tag-accepted   { background:rgba(214,158,46,0.1);  color:#975a16; border:1px solid rgba(214,158,46,0.3); }
        .tag-revision   { background:rgba(237,137,54,0.1);  color:#c05621; border:1px solid rgba(237,137,54,0.3); }
        .tag-review     { background:rgba(160,174,192,0.15); color:#4a5568; border:1px solid rgba(160,174,192,0.4); }
        .tag-conference { background:rgba(99,179,237,0.12);  color:#2b6cb0; border:1px solid rgba(99,179,237,0.35); }

        /* 合作网络 */
        .network-section { padding:6rem 10%; }
        #map { height:500px; border-radius:15px; border:1px solid var(--border); box-shadow:0 8px 24px var(--shadow); margin-top:2rem; }
        .network-legend { display:flex; justify-content:center; gap:3rem; margin-top:2rem; flex-wrap:wrap; }
        .legend-item { display:flex; align-items:center; gap:0.5rem; font-size:0.9rem; color:var(--text-dim); }
        .legend-dot { width:12px; height:12px; border-radius:50%; }
        .legend-dot.primary { background:var(--accent); }
        .legend-dot.partner { background:var(--primary); }

        /* News */
        .news-section { padding:4rem 10%; background:white; }
        .news-list { max-width:900px; margin:0 auto; }
        .news-item { background:var(--bg); padding:1.5rem 2rem; margin-bottom:1rem; border-radius:12px; border-left:4px solid var(--accent); transition:all 0.3s; }
        .news-item:hover { transform:translateX(8px); box-shadow:0 4px 12px var(--shadow); }
        .news-date { font-family:'JetBrains Mono',monospace; color:var(--accent); font-size:0.85rem; margin-bottom:0.5rem; font-weight:600; }
        .news-content { color:var(--text-dim); }

        /* Expandable */
        .expandable-section { padding:0.8rem 10%; max-width:1200px; margin:0 auto; }
        .expandable-header { background:white; padding:1.5rem 2rem; border-radius:12px; cursor:pointer; display:flex; justify-content:space-between; align-items:center; margin-bottom:1rem; transition:all 0.3s; border:1px solid var(--border); }
        .expandable-header:hover { background:var(--bg); border-color:var(--accent); }
        .expandable-title { font-size:1.4rem; font-weight:600; color:var(--primary); font-family:'Playfair Display',serif; }
        .expandable-icon { font-size:1.5rem; transition:transform 0.3s; color:var(--text-dim); }
        .expandable-icon.open { transform:rotate(180deg); }
        .expandable-content { max-height:0; overflow:hidden; transition:max-height 0.5s ease-out; }
        .expandable-content.open { max-height:5000px; }
        .content-grid { display:grid; gap:1rem; padding:1rem 0; }
        .content-item { background:white; padding:1.5rem; border-radius:10px; border-left:3px solid var(--accent); border:1px solid var(--border); transition:all 0.3s; cursor:pointer; }
        .content-item:hover { transform:translateX(5px); box-shadow:0 4px 12px var(--shadow); }
        .content-item a { color:inherit; text-decoration:none; }



        /* References */
        .references-section { padding:4rem 10%; max-width:1200px; margin:0 auto; }
        .references-card { background:white; border-radius:15px; border:1px solid var(--border); padding:2rem; box-shadow:0 4px 16px var(--shadow); }
        .references-note { color:var(--text-dim); margin-top:1.5rem; line-height:1.8; }
        .references-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:1rem; }
        .reference-item { background:var(--bg); border-radius:10px; padding:1.2rem 1.3rem; border-left:3px solid var(--accent); transition:all 0.3s; }
        .reference-item:hover { transform:translateY(-3px); box-shadow:0 6px 16px var(--shadow); }
        .reference-name { font-size:1.05rem; font-weight:700; color:var(--primary); margin-bottom:0.35rem; }
        .reference-role { font-size:0.92rem; color:var(--text-dim); line-height:1.7; }
        .reference-institution { font-size:0.86rem; color:var(--text-light); margin-top:0.35rem; }

        /* Footer */
        footer { padding:3rem 10%; text-align:center; color:var(--text-dim); background:white; border-top:1px solid var(--border); margin-top:4rem; }

        .lang-hidden { display:none; }

        /* [RESPONSIVE] 响应式 */
        @media (max-width:968px) {
            .menu-toggle { display:flex; }
            .header-nav { position:fixed; top:0; right:-100%; width:80%; max-width:300px; height:100vh; background:white; flex-direction:column; justify-content:flex-start; align-items:stretch; gap:0; padding:5rem 0 2rem 0; box-shadow:-5px 0 15px rgba(0,0,0,0.1); transition:right 0.3s ease; overflow-y:auto; }
            .header-nav.active { right:0; }
            nav { flex-direction:column; width:100%; }
            nav a { padding:1rem 2rem; font-size:1rem; text-align:left; border-bottom:1px solid var(--border); border-left:3px solid transparent; }
            nav a:hover { background:var(--bg); border-left-color:var(--accent); }
            .lang-switch { margin:1rem 2rem; }
            .cv-download { margin:0 2rem 1rem 2rem; text-align:center; display:block; }
            .hero { grid-template-columns:1fr; text-align:center; padding:2rem 5%; min-height:auto; }
            .hero-image { order:-1; margin-bottom:1.5rem; }
            .hero-image img { width:200px; height:200px; }
            .hero h1 { font-size:2.2rem; }
            .hero .subtitle { font-size:1.2rem; }
            .hero .tagline { font-size:1rem; }
            .social-links { justify-content:center; }
            .stats-section { padding:3rem 5%; }
            .stats-grid { grid-template-columns:repeat(2,1fr); gap:1.5rem; }
            .stat-number { font-size:2.5rem; }
            .section-title { font-size:1.8rem; padding:0 1rem; }
            .research-section { padding:3rem 5%; }
            .research-card-header { padding:1.5rem; }
            .research-card-inner { padding:0 1.5rem 1.5rem 1.5rem; }
            .research-number { font-size:1.6rem; min-width:2rem; }
            .research-title-zh { font-size:1.2rem; }
            .network-section { padding:3rem 5%; }
            #map { height:350px; }
            .news-section { padding:3rem 5%; }
            .expandable-section { padding:0.5rem 5%; }
            .expandable-title { font-size:1.2rem; }
            .content-item { font-size:0.9rem; }
        }
        @media (max-width:480px) {
            .hero h1 { font-size:1.8rem; }
            .stats-grid { grid-template-columns:1fr; }
            .section-title { font-size:1.5rem; }
        }


/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
    padding: 1rem 0;
}

.skill-card {
    background: white;
    padding: 1.4rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    transition: all 0.3s;
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 18px var(--shadow);
    border-color: var(--accent);
}

.skill-title {
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.9rem;
    font-size: 1.02rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tags span {
    display: inline-block;
    padding: 0.28rem 0.7rem;
    border-radius: 999px;
    background: rgba(26, 54, 93, 0.08);
    color: var(--text-dim);
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1.4;
}

/* ============================================
   修复：skill-tags 内 lang-hidden 被 display:inline-block 覆盖
   ============================================ */
.skill-tags span.lang-hidden,
.skill-title span.lang-hidden {
    display: none !important;
}

/* ============================================
   研究版图：图片
   ============================================ */
.research-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin: 1.2rem 0;
}

.research-img {
    width: 100%;
    border-radius: 10px;
    border: 1px solid var(--border);
    object-fit: contain;
    background: #f8f8f8;
    display: block;
    transition: transform 0.25s, box-shadow 0.25s;
    cursor: zoom-in;
}

.research-img:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 24px var(--shadow);
}

/* ============================================
   灯箱
   ============================================ */
.lightbox-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.82);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
    padding: 2rem;
    animation: lbFadeIn 0.2s ease;
}
.lightbox-overlay.active {
    display: flex;
}
.lightbox-overlay img {
    max-width: 90vw;
    max-height: 88vh;
    object-fit: contain;
    border-radius: 10px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    cursor: default;
    animation: lbZoomIn 0.2s ease;
}
.lightbox-close {
    position: fixed;
    top: 1.2rem;
    right: 1.5rem;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    background: rgba(0,0,0,0.4);
    border: none;
    border-radius: 50%;
    width: 2.4rem;
    height: 2.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    z-index: 10000;
}
.lightbox-close:hover { background: rgba(255,255,255,0.2); }

@keyframes lbFadeIn {
    from { opacity: 0; } to { opacity: 1; }
}
@keyframes lbZoomIn {
    from { transform: scale(0.88); opacity: 0; }
    to   { transform: scale(1);    opacity: 1; }
}

/* ============================================
   研究版图：论文链接
   ============================================ */
.research-papers {
    margin-top: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.research-paper-link {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.88rem;
    line-height: 1.5;
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    transition: all 0.2s;
}
.research-paper-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: white;
    transform: translateX(4px);
}
.research-paper-icon { flex-shrink: 0; margin-top: 0.1rem; }

@media (max-width: 968px) {
    .research-images { grid-template-columns: 1fr; }
}