:root {
  --bg: #ffffff;
  --fg: #1a1d24;
  --muted: #5c6472;
  --line: #e6e8ee;
  --accent: #1e4fa3;      /* site accent (darker blue) */
  --accent2: #7c3aed;     /* secondary accent (purple) */
  --controllable: #F6C5AC;   /* matches Fig. 2 legend swatch */
  --uncontrollable: #E49EDD; /* matches Fig. 2 legend swatch */
  --accent-soft: #eaf1fb;
  --card: #f7f8fb;
  --maxw: 980px;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,24,40,.04), 0 8px 30px rgba(20,24,40,.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- Hero ---------- */
header.hero {
  padding: 66px 0 30px;
  text-align: center;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(900px 340px at 20% -10%, rgba(30,79,163,.10), transparent 60%),
    radial-gradient(900px 340px at 85% -20%, rgba(124,58,237,.08), transparent 60%);
}
.venue {
  font-size: 13px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin-bottom: 14px;
}
h1.title {
  font-size: clamp(29px, 5vw, 46px);
  line-height: 1.12; margin: 0 auto 10px; max-width: 900px; font-weight: 800;
  letter-spacing: -.015em;
}
h1.title .cf { color: var(--accent); }
.subtitle { color: var(--muted); font-size: clamp(16px,2.4vw,20px); margin: 0 auto 22px; max-width: 720px; }
.authors { font-size: 17px; margin: 6px 0 4px; }
.affil { color: var(--muted); font-size: 14.5px; margin-bottom: 4px; }
.anon-note { color: var(--muted); font-size: 13px; font-style: italic; }

.links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin: 26px 0 4px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; text-decoration: none;
  font-weight: 600; font-size: 15px; border: 1px solid var(--fg);
  color: #fff; background: var(--fg); transition: transform .12s ease, box-shadow .12s ease, opacity .12s;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn.ghost { background: #fff; color: var(--fg); }
.btn .ico { font-size: 16px; }

/* ---------- Sections ---------- */
main { padding: 10px 0 40px; }
section { padding: 46px 0; border-bottom: 1px solid var(--line); }
section:last-child { border-bottom: 0; }
h2 {
  font-size: 27px; font-weight: 800; letter-spacing: -.01em; margin: 0 0 6px;
  text-align: center;
}
.section-kicker { text-align:center; color: var(--accent); font-weight:700; font-size:13px; letter-spacing:.12em; text-transform:uppercase; margin-bottom: 8px; }
.lead { max-width: 760px; margin: 12px auto 0; color: var(--fg); }
.center { text-align: center; }
figure { margin: 26px 0 0; }
figure img { width: 100%; height: auto; border-radius: var(--radius); }
figcaption { color: var(--muted); font-size: 14px; margin-top: 12px; text-align: center; }
.framed { border: 1px solid var(--line); box-shadow: var(--shadow); background:#fff; padding: 10px; }

/* ---------- Highlight chips ---------- */
.tldr { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.tldr .card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; text-align: center;
}
.tldr .big { font-size: 30px; font-weight: 800; color: var(--accent); line-height: 1.1; }
.tldr .lbl { color: var(--muted); font-size: 14.5px; margin-top: 6px; }

/* ---------- Legend ---------- */
.legend { display:flex; gap:22px; justify-content:center; margin-top:18px; flex-wrap:wrap; font-size:14.5px; color:var(--muted); }
.legend span::before { content:""; display:inline-block; width:13px; height:13px; border-radius:3px; margin-right:7px; vertical-align:middle; border:1px solid rgba(20,24,40,.18); }
.legend .c::before { background: var(--controllable); }
.legend .u::before { background: var(--uncontrollable); }

/* ---------- Tables ---------- */
.tablewrap { overflow-x: auto; margin-top: 22px; }
table { border-collapse: collapse; width: 100%; font-size: 15.5px; }
caption { caption-side: top; text-align: left; color: var(--muted); font-size: 14px; margin-bottom: 10px; }
th, td { padding: 9px 14px; text-align: center; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
thead th { border-bottom: 2px solid var(--fg); font-weight: 700; }
tbody tr:hover { background: var(--accent-soft); }
td.best { font-weight: 800; color: var(--accent); }
.cf-col { background: rgba(30,79,163,.06); }
tr.grp td { border-top: 2px solid #c7ccd8; }
td:nth-child(2) { color: var(--muted); }

/* ---------- Media grids ---------- */
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 26px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 26px; }
.media { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.media img, .media video { width: 100%; display: block; background:#0e1116; }
.media .cap { padding: 10px 14px; font-size: 14px; color: var(--muted); text-align: center; }
.media .cap b { color: var(--fg); }
.tag { display:inline-block; font-size:12px; font-weight:700; padding:2px 8px; border-radius:999px; margin-left:6px; }
.tag.ok { background:#e7f6ec; color:#1a7f45; }
.tag.fail { background:#fdeaea; color:#c0392b; }

.videoblock { max-width: 760px; margin: 26px auto 0; }
.videoblock video { width:100%; border-radius: var(--radius); box-shadow: var(--shadow); display:block; }

/* ---------- BibTeX ---------- */
pre.bibtex {
  background: #0e1116; color: #e6e8ee; border-radius: var(--radius); padding: 20px 22px;
  overflow-x: auto; font-size: 13.5px; line-height: 1.6; margin-top: 18px;
}
.copybar { display:flex; justify-content:space-between; align-items:center; margin-top: 8px; }
.copybtn { cursor:pointer; font-size:13px; border:1px solid var(--line); background:#fff; border-radius:8px; padding:6px 12px; }

footer { padding: 34px 0 60px; text-align: center; color: var(--muted); font-size: 14px; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .tldr, .grid3 { grid-template-columns: 1fr; }
  .grid2 { grid-template-columns: 1fr; }
  section { padding: 36px 0; }
}