/* GPCV Lab site — modern academic theme */
:root{
  --accent:#9e1f2e; --accent-d:#7e1824; --accent-soft:#faf1f2;
  --ink:#1b2431; --muted:#5c6675; --line:#e6e9ee; --bg:#f6f7f9; --card:#ffffff;
  --radius:14px; --shadow:0 1px 2px rgba(16,24,40,.05),0 8px 24px -12px rgba(16,24,40,.12);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body,html{overflow-x:hidden}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.sec{padding:56px 0}
.sec-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:28px;gap:16px;flex-wrap:wrap}
.sec-head h2{font-size:26px;font-weight:700;letter-spacing:.5px;position:relative;padding-left:16px}
.sec-head h2::before{content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:5px;border-radius:3px;background:var(--accent)}
.cnt{color:var(--muted);font-size:16px;font-weight:500}
.more{color:var(--muted);font-size:15px;white-space:nowrap}
.more:hover{color:var(--accent)}

/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}
.brand-mark{display:grid;place-items:center;width:52px;height:52px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#c34a56);color:#fff;font-weight:800;font-size:15px;letter-spacing:.5px}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text b{font-size:18px}
.brand-text i{font-style:normal;font-size:12px;color:var(--muted)}
nav ul{display:flex;gap:4px;list-style:none}
nav a{display:flex;flex-direction:column;align-items:center;padding:8px 14px;border-radius:10px;color:var(--ink);font-size:15px;font-weight:600;line-height:1.2}
nav a span{font-size:11px;font-weight:400;color:var(--muted)}
nav a:hover{background:var(--accent-soft);color:var(--accent)}
nav li.active a{color:var(--accent);background:var(--accent-soft)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:10px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;border-radius:2px;transition:.2s}

/* hero */
.hero{background:
  radial-gradient(900px 400px at 85% -10%,rgba(158,31,46,.09),transparent 60%),
  radial-gradient(700px 380px at -10% 110%,rgba(158,31,46,.05),transparent 60%),#fff;
  border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:56px;align-items:center;padding:72px 24px}
.hero-kicker{color:var(--accent);font-weight:700;letter-spacing:2px;font-size:14px;margin-bottom:10px}
.hero h1{font-size:52px;line-height:1.15;letter-spacing:1px}
.hero-en{font-size:16px;color:var(--accent);font-weight:600;letter-spacing:.4px;margin:6px 0 2px}
.hero-sub{font-size:19px;color:var(--muted);margin:14px 0 6px;font-weight:500}
.hero-desc{color:var(--muted);max-width:560px}
.hero-cta{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 22px;border-radius:10px;font-weight:600;font-size:15px;transition:.18s;border:1.5px solid transparent}
.btn-solid{background:var(--accent);color:#fff}
.btn-solid:hover{background:var(--accent-d);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-invert{background:#fff;color:var(--accent)}
.btn-invert:hover{transform:translateY(-1px)}
.pi-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;text-align:center}
.pi-photo{width:150px;height:150px;object-fit:cover;object-position:top;border-radius:50%;margin:0 auto 14px;border:4px solid var(--accent-soft)}
.pi-card h3{font-size:20px}
.pi-card h3 small{display:block;font-size:13px;color:var(--muted);font-weight:500;margin-top:2px}
.pi-badges{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin:10px 0}
.pi-badges span{font-size:11.5px;background:var(--accent-soft);color:var(--accent);padding:3px 10px;border-radius:999px;font-weight:600}
.pi-bio{font-size:13.5px;color:var(--muted);text-align:justify}
.pi-links{margin-top:10px;font-size:13px}

/* stats */
.stats{background:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);padding:28px 24px;gap:12px}
.stats-grid>div{text-align:center;border-left:1px solid var(--line)}
.stats-grid>div:first-child{border-left:0}
.stats-grid b{display:block;font-size:34px;color:var(--accent);font-weight:800}
.stats-grid span{color:var(--muted);font-size:14px}

/* news */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.18s}
.news-card:hover{transform:translateY(-3px);box-shadow:0 4px 8px rgba(16,24,40,.06),0 18px 36px -16px rgba(16,24,40,.18)}
.news-thumb{display:block;aspect-ratio:16/9;overflow:hidden;background:var(--bg)}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px}
.news-body time{font-size:12.5px;color:var(--accent);font-weight:700;letter-spacing:.4px}
.news-body h3{font-size:17px;line-height:1.4}
.news-body p{font-size:14px;color:var(--muted)}
.chip-link{display:inline-block;font-size:12px;background:var(--accent-soft);color:var(--accent);border-radius:999px;padding:2px 12px;font-weight:600;align-self:flex-start}

/* directions */
.dir-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.dir-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 16px;transition:.18s;position:relative}
.dir-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.dir-idx{font-size:13px;font-weight:800;color:var(--accent);opacity:.65}
.dir-card p{font-size:14.5px;font-weight:600;margin-top:6px;line-height:1.5}

/* photo strip */
.photo-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.photo-strip img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:10px;border:1px solid var(--line)}

/* cta band */
.cta-band{background:linear-gradient(120deg,var(--accent),#b8434f);color:#fff;padding:44px 0}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-in h2{font-size:24px}
.cta-in p{opacity:.92;max-width:640px}

/* page head */
.page-head{background:#fff;border-bottom:1px solid var(--line);padding:52px 0 36px}
.page-head h1{font-size:36px;letter-spacing:1px}
.page-head p{color:var(--muted);margin-top:6px}
.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.chip{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:5px 16px;font-size:13.5px;font-weight:600;color:var(--muted);scroll-margin-top:90px}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip small{opacity:.7}

/* publications */
.p-list{list-style:none;display:flex;flex-direction:column;gap:14px}
.p-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 20px;transition:.15s}
.p-item:hover{border-color:#d9a0a7}
.p-head{display:flex;align-items:flex-start;gap:10px;flex-wrap:wrap}
.p-title{font-weight:650;font-size:15.5px;color:var(--ink);line-height:1.55}
a.p-title:hover{color:var(--accent)}
.venue{font-size:12px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:2px 10px;white-space:nowrap;margin-top:2px;flex-shrink:0}
.p-authors{font-size:13.5px;color:var(--muted);margin-top:6px}
details>summary{cursor:pointer;font-weight:600;color:var(--accent);padding:10px 0;user-select:none}

/* members */
.pi-detail{display:flex;gap:32px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.pi-detail-photo{width:190px;height:260px;object-fit:cover;object-position:top;border-radius:12px;flex-shrink:0}
.pi-detail h2{font-size:24px;margin-bottom:12px}
.pi-detail h2 small{font-size:14px;color:var(--muted);font-weight:500;margin-left:8px}
.pi-detail p{font-size:14.5px;color:var(--muted);margin-bottom:8px;text-align:justify}
.exp-list{margin-top:12px;list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:4px 24px}
.exp-list li{font-size:13.5px;color:var(--muted);padding-left:14px;position:relative}
.exp-list li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--accent);opacity:.55}
.m-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.m-grid.s{grid-template-columns:repeat(6,1fr);gap:14px}
.m-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 14px;text-align:center;transition:.18s}
.m-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d9a0a7}
.m-photo{width:92px;height:92px;margin:0 auto 12px;border-radius:50%;overflow:hidden;background:var(--accent-soft);display:grid;place-items:center}
.m-photo.noimg::after{content:attr(data-name);color:var(--accent);font-weight:700;font-size:22px}
.m-photo img{width:100%;height:100%;object-fit:cover}
.m-card h4{font-size:16px}
.m-card p{font-size:12.5px;color:var(--muted);margin-top:3px}

/* projects */
.proj-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.proj-card{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.proj-year{background:var(--accent);color:#fff;font-size:12px;font-weight:700;border-radius:8px;padding:4px 10px;flex-shrink:0;margin-top:2px}
.proj-card p{font-size:14.5px;line-height:1.65}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.c-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.c-card h2{font-size:20px;margin-bottom:16px;padding-left:14px;position:relative}
.c-card h2::before{content:"";position:absolute;left:0;top:.3em;bottom:.3em;width:4px;border-radius:2px;background:var(--accent)}
.c-card h2.mt{margin-top:26px}
.c-row{display:flex;gap:14px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.c-row span{color:#fff;background:var(--accent);border-radius:8px;font-size:12px;font-weight:700;padding:3px 10px;flex-shrink:0;margin-top:3px}
.c-row b{font-weight:500}
.c-tip{margin-top:16px;font-size:13.5px;color:var(--muted);background:var(--accent-soft);border-radius:10px;padding:10px 14px}
.dir-list{list-style:none}
.dir-list li{font-size:14.5px;padding:5px 0 5px 18px;position:relative}
.dir-list li::before{content:"";position:absolute;left:0;top:.85em;width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:.55}
.pd-sec{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px 26px;margin-bottom:16px}
.pd-sec h3{font-size:17px;margin-bottom:10px;color:var(--accent)}
.pd-sec ul{list-style:none}
.pd-sec li{font-size:14.5px;padding:4px 0;color:var(--ink)}

/* featured paper cards */
.row-label{grid-column:1/-1;display:flex;align-items:center;gap:14px;margin:14px 0 0;color:var(--muted);font-size:14px;font-weight:700;letter-spacing:2px}
.row-label::before,.row-label::after{content:"";height:1px;background:var(--line);flex:1}
.paper-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.18s}
.paper-card:hover{transform:translateY(-3px);box-shadow:0 4px 8px rgba(16,24,40,.06),0 18px 36px -16px rgba(16,24,40,.18)}
.p-cover{aspect-ratio:16/9;background:#fff;display:grid;place-items:center;padding:14px;position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.p-cover img{width:100%;height:100%;object-fit:contain}
.p-cover .p-wordmark{width:100%;height:100%;border-radius:8px;background:linear-gradient(135deg,#202b3a,#33465f);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:#fff}
.p-wordmark small{font-size:11px;font-weight:700;letter-spacing:3px;color:#e8b4ba}
.p-wordmark{font-size:19px;font-weight:800;letter-spacing:1px;text-align:center}
.p-tag{position:absolute;top:10px;left:10px;background:rgba(158,31,46,.92);color:#fff;font-size:11px;font-weight:700;padding:3px 10px;border-radius:999px;z-index:1}
.p-body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:7px;flex:1}
.p-body h3{font-size:15px;line-height:1.5}
.p-body a:hover h3{color:var(--accent)}
.p-body a.plain{color:inherit}
.p-desc{font-size:13px;color:var(--muted)}
.p-authors{font-size:12.5px;color:var(--muted);margin-top:auto;padding-top:4px}

/* dataset & code cards (data page) */
.ds-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.ds-card{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;color:var(--ink);box-shadow:var(--shadow);transition:.18s;position:relative}
.ds-card:hover{transform:translateY(-3px);border-color:#d9a0a7}
.ds-card h3{font-size:17px;line-height:1.45;padding-right:52px}
.ds-card p{font-size:13.5px;color:var(--muted)}
.ds-num{position:absolute;top:18px;right:18px;font-size:13px;font-weight:800;color:var(--accent);background:var(--accent-soft);border-radius:8px;padding:3px 9px}
.ds-card.code h3{font-size:15px}
.ds-card.code .ds-num{background:#eef2f7;color:#3d5a80}
.ds-go{margin-top:auto;font-size:13px;font-weight:600;color:var(--accent)}
@media (max-width:1000px){.ds-grid{grid-template-columns:1fr 1fr}}
@media (max-width:680px){.ds-grid{grid-template-columns:1fr}}

/* dataset detail pages */
.crumb{display:inline-block;font-size:14px;color:var(--muted);margin-bottom:10px}
.crumb:hover{color:var(--accent)}
.ds-doc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;box-shadow:var(--shadow)}
.ds-doc p{font-size:14.5px;color:var(--ink);margin-bottom:10px;text-align:justify}
.ds-doc p:last-child{margin-bottom:0}
.dl-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.dl-card{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:15px 18px;color:var(--ink);transition:.18s}
.dl-card:hover{transform:translateY(-2px);border-color:var(--accent)}
.dl-ext{background:var(--accent);color:#fff;font-size:11px;font-weight:800;border-radius:8px;padding:5px 10px;flex-shrink:0;min-width:52px;text-align:center}
.dl-name{font-size:14px;font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dl-go{font-size:13px;font-weight:700;color:var(--accent);white-space:nowrap}
.fig-grid{display:grid;grid-template-columns:1fr;gap:18px}
.fig-grid figure{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;margin:0}
.fig-grid img{width:100%;height:auto;border-radius:8px}
@media (max-width:680px){.dl-grid{grid-template-columns:1fr}}

/* recruit section */
.rc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rc-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 22px;box-shadow:var(--shadow);transition:.18s;position:relative}
.rc-card:hover{transform:translateY(-3px);border-color:#d9a0a7}
.rc-num{font-size:13px;font-weight:800;color:var(--accent);opacity:.65}
.rc-card h3{font-size:18px;margin:6px 0 8px}
.rc-card p{font-size:13.5px;color:var(--muted)}
.rc-cta{display:flex;align-items:center;justify-content:space-between;gap:22px;margin-top:20px;background:linear-gradient(120deg,var(--accent),#b8434f);border-radius:14px;padding:22px 30px;color:#fff;flex-wrap:wrap}
.rc-cta p{font-size:14.5px;opacity:.95}
.rc-cta a{color:#ffd9dd}
.rc-cta .btn{flex-shrink:0}
@media (max-width:1000px){.rc-grid{grid-template-columns:1fr 1fr}}
@media (max-width:680px){.rc-grid{grid-template-columns:1fr}.rc-cta{flex-direction:column;align-items:flex-start}}

/* footer */
.site-foot{background:#151a21;color:#c9d0da;margin-top:64px}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px;padding:48px 24px 36px}
.site-foot h4{color:#fff;font-size:16px;margin-bottom:12px}
.site-foot p{font-size:13.5px;line-height:1.9}
.site-foot a{color:#e8b4ba}
.foot-bar{border-top:1px solid #2a323d;padding:16px 0;font-size:12.5px;color:#8b94a3}
.foot-bar a{color:#8b94a3}

/* responsive */
@media (max-width:1000px){
  .hero-grid{grid-template-columns:1fr;gap:32px;padding:48px 24px}
  .hero h1{font-size:40px}
  .news-grid{grid-template-columns:1fr 1fr}
  .dir-grid{grid-template-columns:repeat(3,1fr)}
  .m-grid{grid-template-columns:repeat(4,1fr)}
  .m-grid.s{grid-template-columns:repeat(4,1fr)}
  .photo-strip{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .head-in{height:62px}
  nav{position:fixed;inset:62px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);transform:translateY(-130%);transition:.25s;box-shadow:0 12px 24px rgba(0,0,0,.08)}
  nav.open{transform:none}
  nav ul{flex-direction:column;padding:10px 18px 16px}
  nav a{flex-direction:row;justify-content:space-between;padding:11px 8px;border-radius:8px}
  nav a span{display:none}
  .nav-toggle{display:block}
  .brand-text i{display:none}
  .hero h1{font-size:34px}
  .news-grid,.dir-grid,.contact-grid,.proj-grid{grid-template-columns:1fr}
  .m-grid,.m-grid.s{grid-template-columns:repeat(2,1fr)}
  .exp-list{grid-template-columns:1fr}
  .pi-detail{flex-direction:column;align-items:center}
  .stats-grid{grid-template-columns:1fr 1fr;gap:18px}
  .stats-grid>div:nth-child(3){border-left:0}
  .stats-grid>div{border-top:1px solid var(--line);padding-top:12px}
  .stats-grid>div:nth-child(-n+2){border-top:0}
  .sec{padding:40px 0}
  .page-head{padding:36px 0 28px}
  .page-head h1{font-size:28px}
  .foot-grid{grid-template-columns:1fr;gap:24px}
}