:root{--bg:#0a192f;--fg:#e6f1ff;--muted:#a8b2d1;--accent:#64ffda;--card:#112240;--border:#233554;--shadow:0 10px 30px -15px rgba(2,12,27,.7);--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--radius-8:8px;--radius-12:12px;--phase-undergrad:#64ffda;--phase-award:#ffce6a;--phase-teaching:#9bffb0;--phase-graduate:#7aa5ff;--phase-practice:#ff8ab6}
*{box-sizing:border-box}
html,body{padding:0;margin:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6}
img{max-width:100%;height:auto;display:block}
a{color:var(--fg);text-decoration:none}
h1,h2,h3,h4,h5,h6{margin:0 0 10px}
p{margin:0 0 10px}
ul,ol{margin:0 0 10px;padding-left:20px}
button{font:inherit}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.container{width:min(1100px,92%);margin-inline:auto}
.section{padding:72px 0}
.grid{display:grid;gap:24px}

.site-header{position:sticky;top:0;z-index:50;background:rgba(10,25,47,.8);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border)}
.navbar{display:flex;align-items:center;justify-content:space-between;padding:12px 4%}
.brand{font-weight:700;color:var(--accent)}
.skip-link{position:absolute;left:-999px;top:-999px;background:#fff;color:#000;padding:8px 12px;border-radius:8px;z-index:100}
.skip-link:focus{left:8px;top:8px}
.menu-toggle{display:none;background:transparent;color:var(--fg);font-size:24px;border:1px solid var(--border);padding:6px 10px;border-radius:8px}
.nav-links{list-style:none;display:flex;gap:20px;padding:0;margin:0}
.nav-links a{padding:8px 10px;border-radius:8px}
.nav-links a:hover{background:var(--card)}
.nav-links a.active{color:var(--accent);background:rgba(100,255,218,.08)}
.nav-links a[aria-current="true"]{color:var(--accent);background:rgba(100,255,218,.08)}
.nav-links a:active{transform:scale(.98)}

.hero{background:radial-gradient(circle at top left,rgba(100,255,218,.06),transparent 55%),linear-gradient(180deg,rgba(10,25,47,1),rgba(10,25,47,.96))}
.hero-grid{display:grid;gap:32px;grid-template-columns:220px 1fr;align-items:center}
.avatar-wrap{width:220px;height:220px;border-radius:999px;overflow:hidden;border:2px solid var(--accent);box-shadow:var(--shadow)}
.intro h1{margin:0 0 6px;font-size:32px}
.intro .bio{color:var(--muted);margin-bottom:16px}
.skills-section{display:flex;flex-direction:column;gap:8px}
.skills-label{font-size:14px;color:var(--accent);font-weight:600;text-transform:uppercase;letter-spacing:0.05em}
.tags{display:flex;flex-wrap:wrap;gap:10px}
.tags .tag{border:1px solid var(--accent);color:var(--accent);padding:4px 10px;border-radius:999px;font-size:12px}

.works-grid{grid-template-columns:repeat(3,1fr)}
.card,.work-card{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.card .body,.work-card .body{padding:14px}
.card .title,.work-card .title{font-weight:600}
.card .meta,.work-card .meta{font-size:12px;color:var(--muted)}
.work-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px -20px rgba(2,12,27,.9);border-color:var(--accent)}
.work-card:active{transform:translateY(-2px)}

.research-grid{grid-template-columns:2fr 1fr;align-items:flex-start}
.research-main{padding:16px 18px}
.research-side{padding:16px 18px}

.timeline{list-style:none;padding:0;margin:0;border-left:2px solid var(--border)}
.timeline li{position:relative;padding:14px 16px 14px 24px;margin-left:14px;background:rgba(9,21,41,.9);border-radius:12px;margin-bottom:10px}
.timeline li::before{content:"";position:absolute;left:-10px;top:22px;width:10px;height:10px;background:var(--accent);border-radius:50%}
.timeline .date{font-size:12px;color:var(--muted)}
.timeline .title{font-weight:600}
.timeline li.phase-undergrad{border-left-color:var(--phase-undergrad)}
.timeline li.phase-undergrad::before{background:var(--phase-undergrad)}
.timeline li.phase-award{border-left-color:var(--phase-award)}
.timeline li.phase-award::before{background:var(--phase-award)}
.timeline li.phase-teaching{border-left-color:var(--phase-teaching)}
.timeline li.phase-teaching::before{background:var(--phase-teaching)}
.timeline li.phase-graduate{border-left-color:var(--phase-graduate)}
.timeline li.phase-graduate::before{background:var(--phase-graduate)}
.timeline li.phase-practice{border-left-color:var(--phase-practice)}
.timeline li.phase-practice::before{background:var(--phase-practice)}

.focus-points{display:grid;gap:8px;padding-left:20px}
.focus-points li{list-style:disc;background:rgba(255,255,255,.03);border:1px solid var(--border);padding:8px 12px;border-radius:8px}
.philosophy{margin-top:8px;color:var(--muted)}
.influencers{display:grid;gap:6px;padding-left:20px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--fg);cursor:pointer;transition:background .2s,border-color .2s,color .2s}
.btn:hover{background:rgba(255,255,255,.04)}
.btn-outline{border-color:var(--accent);color:var(--accent)}
.btn-outline:hover{background:rgba(100,255,218,.08)}
.btn-primary{background:var(--accent);color:#003a32;border-color:var(--accent)}
.btn-primary:hover{filter:brightness(.95)}
.btn:active{transform:scale(.98)}
.tag{border:1px solid var(--accent);color:var(--accent);padding:4px 10px;border-radius:999px;font-size:12px}

.chat-panel{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;display:grid;grid-template-rows:1fr auto;min-height:360px}
.chat-history{padding:16px;display:flex;flex-direction:column;gap:12px;overflow:auto}
.msg{display:flex;gap:10px;align-items:flex-start}
.msg .bubble{max-width:78%;padding:10px 12px;border-radius:10px}
.msg.user .bubble{background:#0e3a35;color:#d9fff3;border:1px solid #1f564e}
.msg.ai .bubble{background:#0e2239;color:#d9e8ff;border:1px solid #1e3a5f}
.msg.user{justify-content:flex-end}
.msg.ai{justify-content:flex-start}
.msg.loading .bubble{opacity:.9;font-style:italic}
.msg .time{font-size:11px;color:var(--muted)}
.chat-input{display:flex;gap:10px;padding:10px;border-top:1px solid var(--border)}
.chat-input input{flex:1;padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:#091529;color:var(--fg)}
.chat-input button{padding:10px 16px;border-radius:8px;border:1px solid var(--accent);background:transparent;color:var(--accent)}
.chat-input button:hover{background:rgba(100,255,218,.08)}
.chat-input input[disabled],.chat-input button[disabled]{opacity:.6;cursor:not-allowed}

.site-footer{padding:28px 0;border-top:1px solid var(--border)}
.footer-grid{display:flex;align-items:center;justify-content:space-between;gap:20px}
.contact-info a{margin-right:12px;color:var(--muted)}
.contact-info a:hover{color:var(--accent)}

.empty-state{color:var(--muted);font-size:14px}
.empty-state a{color:var(--accent)}
.empty-state a:hover{text-decoration:underline}

/* 入场动画与滚动显隐 */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s ease, transform .5s ease}
.reveal.show{opacity:1;transform:none}

@media (max-width:1023px){.works-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:767px){
  .hero-grid{grid-template-columns:1fr}
  .avatar-wrap{width:160px;height:160px}
  .research-grid{grid-template-columns:1fr}
  .menu-toggle{display:block}
  .nav-links{position:absolute;right:4%;top:56px;background:var(--card);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:0;overflow:hidden;display:none}
  .nav-links.show{display:flex}
  .nav-links a{padding:12px 16px;border-bottom:1px solid var(--border)}
  .works-grid{grid-template-columns:1fr}
}