:root {
  --ink: #111;
  --muted: #666;
  --faint: #999;
  --line: #e2e2e2;
  --line-strong: #cfcfcf;
  --bg: #fff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 960px; margin: 0 auto; padding: 28px 20px 64px; }

header h1 { font-size: 20px; font-weight: 600; margin: 0 0 4px; letter-spacing: -0.01em; }
header p { margin: 0; color: var(--muted); max-width: 60ch; }
header .src { font-size: 12px; color: var(--faint); margin-top: 6px; }

h2 { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em;
     color: var(--muted); margin: 0 0 10px; }

section { margin-top: 30px; }

/* controls */
.controls { display: flex; flex-wrap: wrap; gap: 20px 32px; align-items: flex-start; }
.ctl { display: flex; flex-direction: column; gap: 7px; }
.ctl > span { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); }
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 5px; overflow: hidden; }
.seg button { border: 0; background: #fff; color: var(--ink); padding: 5px 11px; font: inherit;
              font-size: 13px; cursor: pointer; border-left: 1px solid var(--line-strong); }
.seg button:first-child { border-left: 0; }
.seg button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.sel { font: inherit; font-size: 13px; color: var(--ink); background: #fff; border: 1px solid var(--line-strong);
       border-radius: 5px; padding: 5px 26px 5px 10px; cursor: pointer; -webkit-appearance: none; appearance: none;
       background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6'><path d='M0 0l5 6 5-6z' fill='%23666'/></svg>");
       background-repeat: no-repeat; background-position: right 9px center; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button { border: 1px solid var(--line-strong); background: #fff; color: var(--muted);
                padding: 4px 9px; border-radius: 12px; font: inherit; font-size: 12px; cursor: pointer; }
.chips button[aria-pressed="true"] { background: #f2f2f2; color: var(--ink); border-color: var(--faint); }
.chips .mini { border: 0; background: none; color: var(--faint); text-decoration: underline;
               cursor: pointer; padding: 4px 2px; font-size: 12px; }

/* map */
.mapbox { position: relative; border: 1px solid var(--line); }
canvas { display: block; width: 100%; }
#map { cursor: crosshair; }
.hint { font-size: 12px; color: var(--faint); margin-top: 6px; }
.readout { position: absolute; top: 8px; left: 10px; background: rgba(255,255,255,.9);
           border: 1px solid var(--line); border-radius: 4px; padding: 4px 8px; font-size: 12px;
           color: var(--ink); pointer-events: none; opacity: 0; transition: opacity .1s; white-space: nowrap; }

/* legend */
.legend { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: 11px; color: var(--muted); }
.legend .bar { height: 10px; width: 220px; border: 1px solid var(--line); }
.legend .ticks { display: flex; justify-content: space-between; width: 220px; }
.legend .ticks span { text-align: center; line-height: 1.15; }
.legend .ticks b { display: block; font-weight: 400; color: var(--faint); }

/* percentile slider */
.pctl { display: flex; align-items: center; gap: 10px; margin: -2px 0 14px; }
.pctl > span:first-child { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); }
.pctl input[type="range"] { width: 150px; accent-color: #222; cursor: pointer; }
.pctl #pct-label { font-size: 13px; color: var(--ink); font-variant-numeric: tabular-nums; }

/* stats */
.stats { display: flex; flex-wrap: wrap; gap: 26px; margin-bottom: 14px; }
.stat .n { font-size: 22px; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.stat .n .alt { font-size: 13px; font-weight: 400; color: var(--muted); margin-left: 2px; }
.stat .l { font-size: 12px; color: var(--muted); }

footer { margin-top: 40px; font-size: 12px; color: var(--faint); }
footer a { color: var(--muted); }

@media (max-width: 560px) {
  .legend .bar, .legend .ticks { width: 150px; }
}