/* PoseImageNet — landing page
   Palette and type chosen for an academic dataset page: restrained, print-like. */

:root{
  --ink:#14181d;
  --ink2:#4a5361;
  --ink3:#8a93a1;
  --rule:#e4e7ec;
  --rule2:#eef0f3;
  --bg:#ffffff;
  --bg2:#f8f9fb;
  --bg3:#f2f4f7;
  --accent:#1b4f8f;
  --accent2:#3d7dc4;
  --accent-soft:#eaf1f9;
  --warn:#8a5a00;
  --warn-bg:#fff8e8;
  --warn-rule:#f0e0bd;
  --serif:Georgia,"Times New Roman","Songti SC",SimSun,serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --wrap:1080px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
code{font-family:var(--mono)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.muted{color:var(--ink3)}
.mt{margin-top:28px}


/* ── top bar ──────────────────────────────────────────────────────── */
.topbar{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.94);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--rule);
}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:58px;gap:24px}
.brand{font-family:var(--serif);font-size:18px;font-weight:700;color:var(--ink);letter-spacing:.01em}
.brand:hover{text-decoration:none;color:var(--accent)}
.topbar-actions{display:flex;align-items:center;gap:24px;min-width:0}
.topbar nav{display:flex;gap:24px;font-size:14px;flex-wrap:wrap}
.topbar nav a{color:var(--ink2)}
.topbar nav a:hover{color:var(--accent);text-decoration:none}
.lang-switch{
  display:grid;grid-template-columns:repeat(2,1fr);flex:0 0 auto;
  border:1px solid var(--rule);border-radius:6px;background:var(--bg3);padding:2px;
}
.lang-switch button{
  width:43px;height:28px;border:0;border-radius:4px;background:transparent;
  color:var(--ink3);font:600 12px/1 var(--sans);cursor:pointer;
  transition:background-color .16s,color .16s,box-shadow .16s;
}
.lang-switch button:hover{color:var(--accent)}
.lang-switch button[aria-pressed="true"]{
  color:var(--accent);background:#fff;box-shadow:0 1px 3px rgba(20,24,29,.12);
}
.lang-switch button:focus-visible{outline:2px solid var(--accent2);outline-offset:2px}

main,footer{transition:opacity .12s ease}
body.i18n-switching main,body.i18n-switching footer{opacity:.36}
html[lang="zh-CN"] .definition-diagram-v4 text{font-family:var(--sans)}

/* ── hero ─────────────────────────────────────────────────────────── */
.hero{padding:68px 0 52px;border-bottom:1px solid var(--rule)}
.hero h1{
  font-family:var(--serif);font-size:54px;line-height:1.06;
  margin:0 0 16px;letter-spacing:-.015em;font-weight:700;
}
.subtitle{
  font-family:var(--serif);font-size:22px;line-height:1.42;
  color:var(--ink2);margin:0 0 26px;max-width:840px;font-weight:400;
}
.authors{font-size:15.5px;margin:0 0 6px;color:var(--ink)}
.authors .cor{color:var(--accent);font-weight:600}
.authors .cor::after{content:"*";vertical-align:super;font-size:11px;margin-left:1px}
.affil{font-size:14px;color:var(--ink3);margin:0 0 22px}
.links{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:34px}
.links a{
  display:inline-flex;align-items:center;gap:7px;
  border:1px solid var(--rule);border-radius:999px;
  padding:6px 15px;font-size:13.5px;color:var(--ink2);background:#fff;
}
.links a:hover{border-color:var(--accent2);color:var(--accent);text-decoration:none}
.links a span.n{font-size:11.5px;color:var(--ink3)}
.lead{font-size:17px;line-height:1.78;color:var(--ink2);max-width:860px;margin:0 0 40px}
.lead b{color:var(--ink);font-weight:600}

.statbar{
  display:grid;grid-template-columns:repeat(5,minmax(0,1fr));
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);
}
.stat{padding:22px 20px;border-left:1px solid var(--rule)}
.stat:first-child{border-left:0;padding-left:0}
.stat .v{font-family:var(--serif);font-size:31px;font-weight:700;line-height:1.05;letter-spacing:-.015em;font-variant-numeric:tabular-nums}
.stat .k{font-size:12.5px;color:var(--ink3);margin-top:7px;line-height:1.4}

/* ── sections ─────────────────────────────────────────────────────── */
.sec{padding:68px 0;border-bottom:1px solid var(--rule)}
.sec.alt{background:var(--bg2)}
.eyebrow{font-size:12.5px;letter-spacing:.11em;color:var(--accent);font-weight:700;text-transform:uppercase}
.sec h2{font-family:var(--serif);font-size:29px;font-weight:700;margin:10px 0 0;line-height:1.24;letter-spacing:-.01em}
.dek{font-size:15.5px;color:var(--ink2);max-width:820px;margin:14px 0 36px}
.dek.no-mb{margin-bottom:0}

/* ── figures ──────────────────────────────────────────────────────── */
figure{margin:0}
.fig-frame{border:1px solid var(--rule);border-radius:12px;background:#fff;padding:30px 26px}
.sec.alt .fig-frame{background:#fff}
.definition-diagram{display:block;height:auto}
.definition-diagram-corrected{display:block}
.definition-diagram-v3{display:block}
.definition-diagram-v4{display:block}
#definition .fig-frame > .definition-diagram:not(.definition-diagram-v4){display:none}
figcaption{margin-top:15px;font-size:13.5px;line-height:1.7;color:var(--ink2)}
figcaption b{color:var(--ink);font-weight:700}
.fig-note{margin-top:14px;font-size:13px;color:var(--ink3)}
.fig-note code{font-size:12.5px;background:var(--bg3);padding:1px 5px;border-radius:4px;color:var(--ink2)}

/* ── cards & charts ───────────────────────────────────────────────── */
.card{border:1px solid var(--rule);border-radius:12px;background:#fff;padding:20px 20px 12px;min-width:0}
.card h3{font-size:14.5px;font-weight:600;margin:0 0 3px}
.card .sub{font-size:12.5px;color:var(--ink3);margin:0 0 14px;line-height:1.5}
.card-wide{margin-bottom:20px}
.charts-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.chart{width:100%;min-width:0}
.chart svg{display:block;width:100%;height:auto;overflow:visible}
#statistics .histogram-card{padding-bottom:18px}
#statistics .histogram-card h3{line-height:1.45;min-height:2.9em}
#statistics .chart-explanation{margin:10px 0 0;font-size:12.5px;line-height:1.65;color:var(--ink2)}

/* ── gallery ──────────────────────────────────────────────────────── */
.gallery{border-top:1px solid var(--rule)}
.gal-row{
  display:grid;grid-template-columns:176px minmax(0,1fr);gap:22px;align-items:center;
  padding:16px 0;border-bottom:1px solid var(--rule2);
}
.gal-meta .sup{font-size:11.5px;letter-spacing:.06em;color:var(--accent);font-weight:600;text-transform:uppercase}
.gal-meta .proto{font-family:var(--serif);font-size:19px;font-weight:700;line-height:1.22;margin:4px 0 5px}
.gal-meta .kp{font-size:12.5px;color:var(--ink3)}
.gal-thumbs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.gal-prototype{min-width:0}
.gal-prototype + .gal-prototype{border-left:1px solid var(--rule);padding-left:18px}
.gal-prototype-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);column-gap:8px;row-gap:2px;
  align-items:baseline;margin-bottom:8px;color:var(--ink2);font-size:12px;
}
.gal-prototype-head b{color:var(--accent);font-size:11px;letter-spacing:.04em;text-transform:uppercase}
.gal-prototype-head span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.gal-prototype-head small{grid-column:1/-1;color:var(--ink3);font-size:11px}
.gal-prototype-poses{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.thumb{
  position:relative;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--rule2);border-radius:7px;overflow:hidden;
  background:#fff;aspect-ratio:1/1;
}
.thumb svg,.thumb img{display:block;width:100%;height:100%}
.thumb img{object-fit:contain;object-position:center}
.thumb svg{object-fit:cover}

/* ── annotation ───────────────────────────────────────────────────── */
.ann-grid{display:grid;grid-template-columns:340px minmax(0,1fr);gap:44px;align-items:start}
/* without this the grid track picks up the code block's min-content width and
   blows past the container on narrow screens */
.ann-grid > *{min-width:0}
.ann-text h3{font-size:14.5px;font-weight:600;margin:0 0 12px}
.annotation-sample{display:block;width:100%;height:auto;border-radius:8px}
.field-table{width:100%;border-collapse:collapse;font-size:13.5px}
.field-table td{padding:9px 0;border-bottom:1px solid var(--rule2);vertical-align:top;line-height:1.55}
.field-table td:first-child{width:44%;padding-right:14px}
.field-table code{font-size:12.3px;color:var(--accent);background:var(--accent-soft);padding:1px 5px;border-radius:4px;word-break:break-all}

pre.code{
  background:var(--bg3);border:1px solid var(--rule);border-radius:10px;
  padding:18px 20px;margin:0;overflow:auto;
  font-family:var(--mono);font-size:12.6px;line-height:1.8;color:#2b3442;
  white-space:pre;tab-size:2;
}

/* ── dataset restoration ──────────────────────────────────────────── */
.restore-steps{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;
  list-style:none;padding:0;margin:0 0 26px;counter-reset:restore-step;
}
.restore-steps li{counter-increment:restore-step;border-top:2px solid var(--accent);padding:16px 0 0;min-width:0}
.restore-steps h3,.restore-action h3{font-size:15px;margin:0;font-weight:600}
.restore-steps h3::before{content:counter(restore-step) ". ";color:var(--accent)}
.restore-steps p,.restore-help{font-size:14px;line-height:1.75;color:var(--ink2);margin:8px 0 0}
.restore-steps code,.restore-help code,#sampletrack .dek code{font-size:.9em;color:var(--accent);overflow-wrap:anywhere}
.restore-label{font-size:13px;color:var(--ink2);margin:0 0 8px}
.restore-action{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:26px;flex-wrap:wrap}
.restore-action .btn{display:inline-block}
.restore-help{margin:10px 0 14px}
pre.restore-command{white-space:pre-wrap;overflow-wrap:anywhere}

/* ── citation ─────────────────────────────────────────────────────── */
.cite-head{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:14px;flex-wrap:wrap}
.btn{
  font-family:var(--sans);font-size:13px;color:var(--ink2);
  border:1px solid var(--rule);border-radius:7px;background:#fff;
  padding:7px 16px;cursor:pointer;transition:border-color .15s,color .15s;
}
.btn:hover{border-color:var(--accent2);color:var(--accent)}
.btn.done{border-color:#bcd6c1;color:#2f6b3f;background:#f0f7f1}
.cite-sub{font-family:var(--serif);font-size:19px;font-weight:700;margin:34px 0 12px;color:var(--ink)}
.cite-links{display:grid;gap:14px;margin-top:4px}
.repo-link{font-size:14.5px;font-weight:600;color:var(--accent);text-decoration:none}
.repo-link:hover{text-decoration:underline}
.repo-note{display:block;margin-top:2px;font-size:13px;line-height:1.6;color:var(--ink3)}

/* ── footer ───────────────────────────────────────────────────────── */
footer{padding:52px 0 80px;font-size:13px;color:var(--ink2);line-height:1.8}
footer h4{font-size:12px;letter-spacing:.09em;text-transform:uppercase;color:var(--ink3);margin:0 0 10px;font-weight:700}
footer ul{margin:0 0 28px;padding-left:18px}
footer li{margin-bottom:4px}
footer p{margin:0 0 12px;max-width:820px}
footer p.contact{font-size:16px;line-height:1.85;color:var(--ink);margin:0 0 10px}
footer p.contact a{color:var(--accent);font-weight:700;background:var(--accent-soft);padding:2px 8px;border-radius:6px;border:1px solid var(--rule);white-space:nowrap}
footer p.contact a:hover{text-decoration:none;background:#dde9f6;border-color:var(--accent2)}

/* ── responsive ───────────────────────────────────────────────────── */
@media (max-width:900px){
  .wrap{padding:0 20px}
  .hero h1{font-size:38px}
  .subtitle{font-size:18px}
  .statbar{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat{border-left:1px solid var(--rule);padding:18px 14px}
  .stat:nth-child(odd){border-left:0;padding-left:0}
  .charts-row{grid-template-columns:minmax(0,1fr)}
  .gal-row{grid-template-columns:minmax(0,1fr);gap:10px}
  .gal-thumbs{grid-template-columns:minmax(0,1fr);gap:16px}
  .gal-prototype + .gal-prototype{border-left:0;border-top:1px solid var(--rule);padding:14px 0 0}
  .ann-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .restore-steps{grid-template-columns:minmax(0,1fr);gap:16px}
  .topbar nav{display:none}
  .topbar-actions{gap:0}
  .sec{padding:52px 0}
  #definition .fig-frame{overflow-x:auto;padding:22px 18px}
  .definition-diagram{min-width:1120px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  main,footer,.lang-switch button{transition:none}
}