/* ===== Qinyuan Lei — modern rebuild in the original Squarespace palette =====
   Colors: white bg / black ink / gray accents / blue links
   Fonts: Helvetica Neue stack (display+labels) + Georgia/Times stack (serif body) */
:root{
  --bg:#ffffff;
  --ink:#111111;
  --gray:#8c8c8c;
  --soft:#555555;
  --hairline:#e8e8e8;
  --link:#1a56db;
  --sans:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --serif:Georgia,"Times New Roman",Times,"Songti SC","SimSun",serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}

.wrap{max-width:940px;margin:0 auto;padding:0 28px}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- header ---------- */
.site-header{text-align:center;padding:84px 24px 0}
.site-header .name{font-weight:900;font-size:clamp(38px,8vw,80px);letter-spacing:.045em;line-height:1;color:var(--ink)}
.site-header .cn{font-family:var(--serif);color:var(--gray);font-size:clamp(17px,2.2vw,22px);letter-spacing:.55em;text-indent:.55em;margin-top:22px}
.site-header .tag{font-family:var(--serif);font-style:italic;color:var(--gray);font-size:16px;margin-top:12px}

/* ---------- nav ---------- */
.main-nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);margin-top:52px}
.main-nav .wrap{display:flex;justify-content:center;gap:clamp(18px,4vw,46px);padding:17px 28px;flex-wrap:wrap}
.main-nav a{font-size:11.5px;font-weight:600;letter-spacing:.3em;text-transform:uppercase;color:var(--ink)}
.main-nav a:hover{color:var(--gray);text-decoration:none}

/* ---------- sections ---------- */
section{padding:72px 0;border-bottom:1px solid var(--hairline)}
.kicker{font-size:11px;font-weight:600;letter-spacing:.32em;text-transform:uppercase;color:var(--gray);margin-bottom:18px}
h2{font-weight:800;font-size:clamp(24px,3.6vw,32px);letter-spacing:.005em;line-height:1.25;margin-bottom:26px}

/* ---------- intro ---------- */
.intro{display:grid;grid-template-columns:250px 1fr;gap:60px;align-items:start}
.intro>div:last-child{grid-column:2/-1}
.avatar{width:230px;height:230px;border-radius:50%;object-fit:cover;display:block;margin-top:6px}
.lede{font-family:var(--serif);font-size:17.5px;line-height:1.85;color:#2b2b2b}
.lede .hi{font-size:24px;font-weight:700;color:var(--ink);display:block;margin-bottom:14px;font-family:var(--serif)}
.lede p+p{margin-top:16px}
.video{position:relative;aspect-ratio:16/9;background:#f4f4f4;margin-bottom:16px}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.caption{font-size:14.5px;color:#333;line-height:1.75}
.caption .quote{display:block;margin-top:12px;color:var(--gray);font-family:var(--serif);font-style:italic}

/* ---------- films ---------- */
.film{padding:40px 0;border-bottom:1px solid var(--hairline)}
.film:last-of-type{border-bottom:none;padding-bottom:0}
.film-head{display:grid;grid-template-columns:200px 1fr;gap:40px;align-items:start}
.poster img{width:100%;display:block;border:1px solid var(--hairline)}
.meta{font-size:11.5px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--gray);margin-bottom:10px}
.film h3{font-weight:800;font-size:clamp(20px,2.6vw,24px);line-height:1.3;margin-bottom:12px}
.film .body p{font-size:15px;color:#333;line-height:1.75;margin-bottom:12px}
.laurels{font-size:13px;color:var(--soft);line-height:2;margin-top:6px}
.laurels b{color:var(--ink);font-weight:700}
.stills{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0;align-items:start}
.stills img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;border:1px solid var(--hairline)}
.stills .video{margin:0}
.credits{list-style:none;margin:6px 0 16px;font-size:14px}
.credits li{display:flex;gap:18px;align-items:baseline;padding:5px 0;border-bottom:1px dashed var(--hairline);color:#333}
.credits li:last-child{border-bottom:none}
.credits span{flex:0 0 175px;color:var(--gray);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase}
@media(max-width:560px){
  .credits li{flex-direction:column;gap:1px}
  .credits span{flex:none}
}
.zh{font-family:var(--serif);color:#2b2b2b}

/* ---------- research ---------- */
.paper{padding:24px 0;border-bottom:1px solid var(--hairline)}
.paper:last-child{border-bottom:none}
.paper .venue{font-size:11px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--gray)}
.paper h3{font-weight:800;font-size:18px;margin:8px 0 6px;line-height:1.4}
.paper .authors{font-size:13.5px;color:var(--soft)}

/* ---------- news ---------- */
.news-item{display:grid;grid-template-columns:190px 1fr;gap:32px;padding:30px 0;border-bottom:1px solid var(--hairline);align-items:start}
.news-item:last-child{border-bottom:none}
.news-item .thumb{width:190px;height:135px;object-fit:cover;border:1px solid var(--hairline);display:block}
.news-item .thumb.contain{object-fit:contain;background:#fff}
.news-item .date{font-size:10.5px;font-weight:700;letter-spacing:.24em;text-transform:uppercase;color:var(--gray);margin-bottom:6px}
.news-item h3{font-weight:800;font-size:19px;margin-bottom:8px;line-height:1.35}
.news-item p{font-size:14.5px;color:#444;line-height:1.7}

/* ---------- stories preview ---------- */
.story{display:flex;justify-content:space-between;gap:20px;align-items:baseline;padding:15px 0;border-bottom:1px dashed var(--hairline)}
.story .title{font-family:var(--serif);font-size:17px;color:var(--ink)}
.story .title a{color:var(--ink)}
.story .date{font-size:12px;color:var(--gray);white-space:nowrap}
.btn{display:inline-block;margin-top:30px;font-size:11.5px;font-weight:700;letter-spacing:.26em;text-transform:uppercase;color:var(--ink);border:1px solid var(--ink);padding:13px 30px}
.btn:hover{background:var(--ink);color:#fff;text-decoration:none}

/* ---------- footer ---------- */
footer{padding:72px 0 60px;text-align:center}
footer .email{font-family:var(--serif);font-size:clamp(20px,3vw,26px);margin:16px 0 26px}
.socials{display:flex;gap:30px;justify-content:center;flex-wrap:wrap;margin-bottom:34px}
.socials a{font-size:11.5px;font-weight:600;letter-spacing:.26em;text-transform:uppercase;color:var(--ink)}
.socials a:hover{color:var(--gray);text-decoration:none}
.copy{font-size:12px;color:var(--gray)}

/* ---------- responsive ---------- */
@media(max-width:780px){
  .intro{grid-template-columns:1fr;gap:36px}
  .avatar{width:190px;height:190px}
  .film-head{grid-template-columns:1fr;gap:24px}
  .poster{max-width:220px}
  .news-item{grid-template-columns:1fr;gap:14px}
  .news-item .thumb{width:100%;height:170px}
  .stills{grid-template-columns:1fr}
  section{padding:54px 0}
  .site-header{padding-top:60px}
}

@media(max-width:480px){
  .wrap{padding:0 18px}
  section{padding:44px 0}
  .lede{font-size:16px;line-height:1.8}
  .news-item .thumb{height:150px}
  .main-nav .wrap{gap:14px;padding:14px 18px}
  .main-nav a{letter-spacing:.2em}
  .site-header .cn{letter-spacing:.35em;text-indent:.35em}
  .video{margin-bottom:12px}
  .film{padding:30px 0}
}