:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --surface: #fcfcfb;
  --ink: #0f1720;
  --ink2: #4d5663;
  --muted: #737b86;
  --grid: #e3e6ea;
  --axis: #b3bac3;
  --zero: #8d949d;
  --s-adv: #2a78d6;
  --s-em: #eb6834;
  --btn: #eef0f3;
  --tip-bg: #0f1720;
  --tip-ink: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121416;
    --surface: #1a1b1d;
    --ink: #f3f4f5;
    --ink2: #c1c6cc;
    --muted: #8d949c;
    --grid: #2a2d31;
    --axis: #4a4f55;
    --zero: #6b7178;
    --s-adv: #3987e5;
    --s-em: #d95926;
    --btn: #25272a;
    --tip-bg: #f3f4f5;
    --tip-ink: #0f1720;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121416;
  --surface: #1a1b1d;
  --ink: #f3f4f5;
  --ink2: #c1c6cc;
  --muted: #8d949c;
  --grid: #2a2d31;
  --axis: #4a4f55;
  --zero: #6b7178;
  --s-adv: #3987e5;
  --s-em: #d95926;
  --btn: #25272a;
  --tip-bg: #f3f4f5;
  --tip-ink: #0f1720;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 "IBM Plex Sans", system-ui, -apple-system, sans-serif;
}
.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px 56px;
  display: grid;
  gap: 24px;
}
/* Let grid children shrink below the charts' min-width; the charts scroll inside their card instead. */
.wrap > * { min-width: 0; }
h1 {
  font: 600 clamp(26px, 4vw, 38px)/1.15 Fraunces, Georgia, serif;
  margin: 0 0 8px;
  text-wrap: balance;
}
h2 { font-size: 18px; font-weight: 600; margin: 0; }
.lede { color: var(--ink2); max-width: 66ch; margin: 0 0 14px; }
.sub { color: var(--muted); font-size: 13px; margin: 2px 0 0; }
.legend { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13.5px; color: var(--ink2); }
.legend span { display: inline-flex; align-items: center; gap: 8px; }
.swatch { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }

.card {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 10px;
  padding: 18px 18px 14px;
}
.card-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px 24px;
  margin-bottom: 6px;
}
.how { color: var(--ink2); font-size: 13.5px; max-width: 80ch; margin: 8px 0 0; }


.player { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.player button {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 50%;
  background: var(--btn);
  color: var(--ink);
  cursor: pointer;
}
.player button svg { width: 14px; height: 14px; fill: currentColor; }
.player button .i-pause, .player button[aria-pressed="true"] .i-play { display: none; }
.player button[aria-pressed="true"] .i-pause { display: block; }
.player button:focus-visible, .player input:focus-visible { outline: 2px solid var(--s-adv); outline-offset: 2px; }
.player input { width: 200px; accent-color: var(--s-adv); }
.player .end { font: 12px "IBM Plex Mono", monospace; color: var(--muted); }
.player output { font: 600 15px "IBM Plex Mono", monospace; font-variant-numeric: tabular-nums; min-width: 11ch; }
.chart .watermark { font-family: Fraunces, Georgia, serif; font-size: 64px; font-weight: 600; fill: var(--grid); pointer-events: none; }

.size-key { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; font-size: 12.5px; color: var(--muted); }
.size-key svg { overflow: visible; }
.size-key .k { display: inline-flex; align-items: center; gap: 6px; }

.chart { position: relative; overflow-x: auto; }
.chart svg { display: block; width: 100%; min-width: 600px; height: auto; }
.chart text { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: 11px; fill: var(--ink2); }
.chart .axis-title { font-family: "IBM Plex Sans", system-ui, sans-serif; font-size: 12px; fill: var(--muted); }
.chart .lbl { fill: var(--ink); font-size: 10.5px; pointer-events: none; }
.chart .grid line { stroke: var(--grid); }
.chart .zero { stroke: var(--zero); stroke-dasharray: 3 3; }
.chart .baseline { stroke: var(--axis); }
.bubble { cursor: pointer; }
.bubble circle { stroke: var(--surface); stroke-width: 1.5; }
.bubble.hollow circle { stroke-width: 2.25; }
.bubble:hover circle, .bubble:focus circle { stroke: var(--ink); stroke-width: 2; }
.bubble:focus { outline: none; }

.tip {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  background: var(--tip-bg);
  color: var(--tip-ink);
  font-size: 12.5px;
  line-height: 1.5;
  padding: 8px 11px;
  border-radius: 6px;
  max-width: 280px;
  transform: translate(-50%, calc(-100% - 14px));
}
.tip b { display: block; font-weight: 600; margin-bottom: 2px; }
.tip .row { display: flex; justify-content: space-between; gap: 14px; font-family: "IBM Plex Mono", monospace; font-variant-numeric: tabular-nums; }
.tip .row span:first-child { font-family: "IBM Plex Sans", sans-serif; opacity: 0.75; }

.table-card summary { cursor: pointer; font-weight: 500; }
.tbl { overflow-x: auto; margin-top: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--grid); white-space: nowrap; }
th { color: var(--muted); font-weight: 500; }
td.n, th.n { text-align: right; font-family: "IBM Plex Mono", monospace; }

.src { color: var(--muted); font-size: 12.5px; max-width: 90ch; }
.src p { margin: 0 0 6px; }
.src a { color: inherit; }

@media (max-width: 560px) {
  .player input { flex: 1; width: auto; min-width: 0; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}