:root{
  --bg:#ffffff;
  --text:#111827;
  --muted:#4b5563;
  --line:#e5e7eb;
  --soft:#f9fafb;
  --soft2:#f3f4f6;
  --blue:#2563eb;
  --indigo:#4f46e5;
  --green:#10b981;
  --radius:14px;
  --max: 980px;
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height:1.65;
}
a{color:var(--blue); text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(var(--max), calc(100% - 40px)); margin:0 auto;}
header.top{
  position:sticky; top:0; z-index:20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar{display:flex; align-items:center; justify-content:space-between; gap:14px; padding:14px 0;}
.brand{display:flex; align-items:center; gap:10px; font-weight:800; letter-spacing:.2px;}
.brand img{width:26px; height:26px}
.nav{display:flex; flex-wrap:wrap; gap:10px; align-items:center; font-size:13px; color:var(--muted);}
.nav a{color:var(--muted); padding:6px 10px; border-radius:999px;}
.nav a:hover{background: var(--soft); color: var(--text); text-decoration:none;}
.hero{padding:40px 0 10px;}
h1{
  font-family: var(--serif);
  font-size: 42px;
  line-height:1.12;
  letter-spacing:-.4px;
  margin:0 0 10px;
}
@media (max-width:520px){h1{font-size:34px}}
.subtitle{color:var(--muted); margin:0 0 12px; font-size:15px;}
.authors{color:var(--muted); font-size:14px; margin: 6px 0 14px;}
.links{display:flex; gap:10px; flex-wrap:wrap; margin:14px 0 0;}
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid var(--line);
  background: var(--soft);
  color: var(--text);
  font-weight:650;
  font-size:13px;
}
.btn:hover{text-decoration:none; background: var(--soft2);}
.btn.primary{border-color: rgba(79,70,229,.25); background: rgba(79,70,229,.08);}
.section{padding: 24px 0;}
.section h2{
  font-family: var(--serif);
  font-size: 24px;
  margin:0 0 10px;
}
.section h3{
  font-family: var(--serif);
  font-size: 18px;
  margin: 18px 0 8px;
}
.section h4{
  font-size: 15px;
  margin: 14px 0 6px;
}
p{margin:10px 0; color: #111827;}
p.muted{color: var(--muted);}
.card{
  border:1px solid var(--line);
  border-radius: var(--radius);
  background:#fff;
}
.figure{padding:12px; background:#fff;}
.figure img{width:100%; height:auto; border-radius: 10px; border:1px solid var(--line); background:#fff;}
figcaption{font-size:13px; color:var(--muted); margin-top:8px;}
hr.sep{border:0; border-top:1px solid var(--line); margin:18px 0;}
ul{margin:8px 0 0; padding-left: 18px;}
li{margin:6px 0;}
.kbd{
  font-family: var(--mono);
  background: var(--soft);
  border:1px solid var(--line);
  border-radius: 8px;
  padding: 2px 6px;
  font-size: 12px;
}
.tablewrap{overflow:auto; border-radius: var(--radius); border:1px solid var(--line); background:#fff;}
table{
  border-collapse: collapse;
  width:100%;
  min-width: 880px;
  font-size: 13px;
}
thead th{
  text-align:left;
  padding:10px 10px;
  background: var(--soft);
  border-bottom:1px solid var(--line);
  white-space:nowrap;
}
tbody td{
  padding:9px 10px;
  border-bottom:1px solid var(--line);
  white-space:nowrap;
}
tbody tr.group td{
  background: #f1f5f9;
  font-weight:800;
  color:#334155;
}
mark.best{
  background: rgba(16,185,129,.18);
  padding: 1px 5px;
  border-radius: 8px;
}
.pill{
  display:inline-flex; align-items:center;
  padding:2px 8px;
  border-radius:999px;
  border:1px solid var(--line);
  background: var(--soft);
  color: var(--muted);
  font-size: 12px;
  gap:6px;
}
.pill b{color: var(--text)}
.codebox{padding:12px;}
pre{
  margin:0;
  padding:12px;
  border-radius: 10px;
  border:1px solid var(--line);
  background: var(--soft);
  overflow:auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height:1.5;
}
.copybtn{
  cursor:pointer;
  border:1px solid var(--line);
  background:#fff;
  border-radius:999px;
  padding:7px 11px;
  font-weight:700;
  font-size:13px;
}
footer{
  border-top:1px solid var(--line);
  padding: 22px 0 38px;
  color: var(--muted);
  font-size: 13px;
}
.small{font-size:13px; color: var(--muted);}
blockquote{
  margin: 10px 0;
  padding: 10px 14px;
  border-left: 3px solid var(--line);
  background: var(--soft);
  color: var(--muted);
}

/* -------- DeepSIM-like header layout -------- */
.hero{padding: 56px 0 22px; text-align:center;}
.hero .title{
  font-family: var(--sans);
  font-weight: 800;
  font-size: 45px;
  letter-spacing: -0.8px;
  line-height: 1.08;
  margin: 0 auto 18px;
  max-width: 980px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: -8px;
}
.hero .title-icon{
  width: auto;
  height: 72px;
  object-fit: contain;
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: -10px;
}
@media (max-width: 720px){
  .hero .title{font-size: 36px; line-height:1.12;}
  .hero .title-icon{width:56px; height:56px;}
}
.authorline{
  font-size: 20px;
  color: #111827;
  margin: 0 auto 10px;
  max-width: 980px;
  text-align:center;
}
.authorrows{
  display:flex;
  flex-direction:column;
  gap:6px;
}
.authorrow{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap: 10px;
}
.authorline .author{
  color: var(--blue);
  font-weight: 650;
}
.authorline sup{
  font-size: 12px;
  color: #6b7280;
  margin-left: -3px;
  vertical-align: super;
}
.affils{
  color: #374151;
  font-size: 18px;
  margin: 6px auto 18px;
  text-align:center;
}
.affils .venue{margin-top: 6px; color:#374151;}
.affils .note{
  margin-top: 10px;
  font-size: 14px;
  color: #6b7280;
}
.affils .emails{
  font-family: var(--mono);
}
.corner-badge{
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 100;
  display: block;
}
.corner-badge img{
  width: 52px;
  height: 52px;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.08);
  background: #fff;
  box-shadow: 0 4px 14px rgba(0,0,0,0.12);
}
.corner-badge:hover img{
  box-shadow: 0 6px 20px rgba(0,0,0,0.18);
}
.btnrow{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap: 12px;
  margin: 18px auto 12px;
}
.pbtn{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 11px 18px;
  border-radius: 999px;
  background: #111827;
  color: #ffffff;
  font-weight: 750;
  font-size: 16px;
  border: 1px solid rgba(17,24,39,.9);
}
.pbtn:hover{
  text-decoration:none;
  background:#0b1220;
}
.pbtn .ico{
  width: 18px;
  height: 18px;
  display:block;
}
.pbtn .btn-emoji{
  font-size: 18px;
  line-height: 1;
}
.mininav{
  margin-top: 16px;
  color: #6b7280;
  font-size: 14px;
}
.mininav a{color:#6b7280;}
.mininav a:hover{color:#111827; text-decoration:none;}
/* Make section headers feel academic */
.section h2{margin-top: 10px;}

/* -------- Case Study -------- */
.case-block{
  margin: 28px 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.case-block h3{
  margin: 0 0 12px;
  font-size: 18px;
  color: var(--text);
}
.prompt-box{
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 16px;
}
.prompt-box b{
  color: var(--blue);
  font-size: 14px;
}
.prompt-text{
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: #374151;
  white-space: pre-wrap;
}
.video-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.video-item{
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.video-item video{
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #000;
}
.video-label{
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
}
@media (max-width: 640px){
  .video-grid{
    grid-template-columns: 1fr;
  }
}