:root {
  --bg: #f6f6f4;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --muted: #5a5a5a;
  --line: #e6e6e1;
  --accent: #b31529;          /* matches the high-uncertainty red */
  --accent-soft: #f7e4e7;
  --blue: #1065ab;            /* matches the low-uncertainty blue */
  --green: #2c8a3d;           /* relabeled ground truth */
  --gold: #c8870b;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
  --radius: 12px;
  --max: 1100px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
kbd {
  font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace;
  font-size: 0.85em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  padding: 0.05em 0.45em;
  border-radius: 4px;
  background: #fff;
}
code, pre { font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace; }

/* -------- hero -------- */
.hero {
  background:
    radial-gradient(1200px 600px at 90% -20%, rgba(179,21,41,0.08), transparent 60%),
    radial-gradient(1000px 600px at -10% 120%, rgba(16,101,171,0.10), transparent 60%),
    var(--surface);
  border-bottom: 1px solid var(--line);
}
.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 64px 24px 48px;
}
.venue {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  font-weight: 700;
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}
.hero h1 .accent { color: var(--accent); }
.authors {
  list-style: none;
  padding: 0;
  margin: 0 0 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-weight: 500;
}
.authors li::after { content: ","; }
.authors li:last-child::after { content: ""; }
.affiliation { color: var(--muted); margin: 0 0 24px; font-size: 14px; }

.cta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-weight: 500;
  font-size: 14px;
  transition: transform 0.06s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}
.btn:hover { box-shadow: var(--shadow); border-color: #d9d9d3; text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.primary:hover { background: #000; }

.tldr {
  margin-top: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 16px 18px;
  border-radius: 6px;
  font-size: 15px;
  max-width: 780px;
}

/* -------- sections -------- */
main { max-width: var(--max); margin: 0 auto; padding: 48px 24px 64px; }
.text-block { margin: 0 auto 56px; max-width: 780px; }
.text-block h2,
.viewer-section > .viewer-header h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.005em;
  margin: 0 0 14px;
}
.text-block p { color: #2a2a2a; }

/* -------- viewer -------- */
.viewer-section { margin-bottom: 64px; }
.viewer-header { max-width: 780px; margin-bottom: 16px; }
.viewer-header p { color: var(--muted); margin: 0; }

.viewer-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: #fafaf7;
}
.layer-toggles, .bin-toggles { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  cursor: pointer;
  user-select: none;
  color: #333;
}
.toggle input { accent-color: var(--ink); }
.toggle .swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 2px solid #888;
  display: inline-block;
}
.toggle.kitti .swatch        { border-color: var(--accent); border-style: dashed; }
.toggle.predictions .swatch  { border-color: var(--blue); }
.toggle.relabeled .swatch    { border-color: var(--green); }
.toggle.uncertainty-toggle .unc-swatch {
  background: linear-gradient(to right, rgb(16,101,171), rgb(249,249,249), rgb(179,21,41));
  border: 1px solid #bbb;
}

.bin-toggles .pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 13px;
  cursor: pointer;
  background: #fff;
}
.bin-toggles .pill:has(input:checked) {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.bin-toggles input { display: none; }

.canvas-wrap {
  position: relative;
  background:
    repeating-conic-gradient(#f1f1ec 0 25%, #ffffff 0 50%) 0 0/24px 24px;
}
#annotation-canvas {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
}
.canvas-meta {
  position: absolute;
  left: 12px;
  bottom: 10px;
  background: rgba(0,0,0,0.65);
  color: #fff;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  pointer-events: none;
}

.viewer-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: #fafaf7;
}
.nav-btn {
  border: 1px solid var(--line);
  background: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 500;
}
.nav-btn:hover { box-shadow: var(--shadow); }
.nav-btn:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }
.position { text-align: center; font-weight: 500; }
.position #img-id {
  font-family: 'JetBrains Mono', monospace;
  display: block;
}
.position small { color: var(--muted); font-size: 12px; }

.legend-details {
  max-width: 780px;
  margin: 18px auto 0;
  font-size: 14px;
  color: var(--muted);
}
.legend-details summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--ink);
}
.legend-details ul { padding-left: 18px; }
.legend-details .dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  border: 2px solid currentColor;
  margin-right: 4px;
  vertical-align: middle;
}
.legend-details .dot.kitti { color: var(--accent); border-style: dashed; }
.legend-details .dot.predictions { color: var(--blue); }
.legend-details .dot.relabeled { color: var(--green); }

/* -------- paper / bibtex / footer -------- */
.paper-block .bib {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 13px;
  overflow-x: auto;
  position: relative;
}
.copy-bib { margin-top: 10px; }

.resources {
  list-style: none;
  padding: 0;
  margin: 0 0 14px;
}
.resources li {
  border-left: 2px solid var(--line);
  padding: 4px 14px;
  margin: 10px 0;
  font-size: 15px;
}
.resources li strong { color: var(--ink); }
.footnote {
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

footer {
  border-top: 1px solid var(--line);
  text-align: center;
  padding: 24px 16px;
  color: var(--muted);
  font-size: 13px;
}

/* -------- responsive -------- */
@media (max-width: 600px) {
  .hero-inner { padding: 40px 18px 32px; }
  .viewer-toolbar { flex-direction: column; align-items: flex-start; }
  .position #img-id { font-size: 13px; }
}