:root {
  --bg: #fbfaf7; --ink: #1c1b19; --muted: #6b6861; --line: #d9d5cc;
  --accent: #2563eb; --accent2: #ea580c; --panel: #ffffff;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.4 "Source Sans 3", "Source Sans Pro", system-ui, -apple-system, "Segoe UI", sans-serif; }
.wrap { padding: 10px 14px; max-width: 1100px; margin: 0 auto; }
.controls { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; margin-bottom: 8px; }
.controls label { display: flex; align-items: center; gap: 6px; color: var(--muted); }
.controls input[type=range] { width: 140px; accent-color: var(--accent); }
.controls .val { font-variant-numeric: tabular-nums; color: var(--ink); min-width: 3.2em; }
button { font: inherit; padding: 4px 12px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--panel); color: var(--ink); cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.seg button { border: none; border-radius: 0; border-right: 1px solid var(--line); }
.seg button:last-child { border-right: none; }
.seg button.on { background: var(--ink); color: #fff; }
.panels { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
.panel h3 { margin: 2px 4px 2px; font-size: 13px; font-weight: 600; color: var(--muted);
  letter-spacing: .01em; }
svg { display: block; width: 100%; height: auto; }
svg text { font-family: inherit; }
.readout { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 14px; margin-top: 6px; }
.readout b { color: var(--ink); font-weight: 600; }
.edge { stroke: #a8a398; }
.axis { stroke: #b9b4aa; stroke-width: 1; }
.tick { fill: var(--muted); font-size: 11px; }