/* Shared by every page of the site. One source for tokens, themes, controls and chart frames.
   Themes are the viewer's pick (data-skin on the root): Light is the default (bare :root),
   Classic is the owner's 2021 seaborn look (grey plot panel, white grid, C0..C3), Dark. */
:root {
  color-scheme: light;
  --page: #f6f6f3; --card: #fcfcfb; --panel: #fcfcfb; --grid: #e6e5df; --tint: #eef3fb;
  --ink: #0b0b0b; --ink-2: #52514e; --muted: #7d7b75; --line: #e1e0d9; --field: #ffffff;
  --focus: #2a78d6; --bad: #d03b3b; --shadow: rgba(11, 11, 11, 0.10);
  --series-a: #2a78d6; --series-b: #eb6834; --series-c: #1baf7a; --series-d: #4a3aa7;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Trebuchet MS", system-ui, sans-serif;   /* the musicish composer's band-name face (#title) */
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
}
:root[data-skin="classic"] {
  --page: #ffffff; --card: #ffffff; --panel: #eaeaf2; --grid: #ffffff; --tint: #eef0f7;
  --ink: #262626; --ink-2: #4a4a52; --muted: #767682; --line: #d9d9e3; --field: #ffffff;
  --focus: #4c72b0; --bad: #c44e52;
  --series-a: #4c72b0; --series-b: #55a868; --series-c: #c44e52; --series-d: #8172b2;
}
:root[data-skin="dark"] {
  color-scheme: dark;
  --page: #0f0f0e; --card: #1a1a19; --panel: #222220; --grid: #34342f; --tint: #1c2430;
  --ink: #ffffff; --ink-2: #c3c2b7; --muted: #8f8d86; --line: #2f2f2c; --field: #121211;
  --focus: #3987e5; --bad: #e66767; --shadow: rgba(0, 0, 0, 0.45);
  --series-a: #3987e5; --series-b: #d95926; --series-c: #199e70; --series-d: #9085e9;
}
body { margin: 0; background: var(--page); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.45; }
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--focus); }

/* top navigation: brand, the two pages, the theme switch */
.topnav { border-bottom: 1px solid var(--line); background: var(--card); }
.topnav .in { max-width: 1120px; margin: 0 auto; padding-inline: 16px; padding-block: 10px; display: flex; flex-wrap: wrap;
  align-items: center; gap: 8px 18px; }
.topnav .brand { font: bold 18px var(--display); color: var(--ink); text-decoration: none; margin-right: 6px; }
.topnav .pages { display: flex; gap: 4px; flex-wrap: wrap; }
.topnav .pages a { color: var(--ink-2); text-decoration: none; padding: 5px 10px; border-radius: 6px; font-weight: 500; font-size: 14.5px; }
.topnav .pages a:hover { color: var(--ink); background: var(--tint); }
.topnav .pages a[aria-current="page"] { color: var(--ink); background: var(--tint); }
.topnav .skin { margin-left: auto; display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }

.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 16px; padding-block: 26px 56px; display: grid; gap: 26px; }
.hero h1 { font-family: var(--display); font-weight: bold; font-size: clamp(28px, 3.6vw, 38px); line-height: 1.15; margin: 0; text-wrap: balance; }
.hero .lede { margin: 6px 0 0; color: var(--ink-2); font-size: 16.5px; max-width: 62ch; }

/* numbered steps: the page really is a sequence */
.step { display: grid; gap: 14px; }
.step > h2 { display: flex; align-items: center; gap: 10px; margin: 0; font: 600 19px var(--sans); text-wrap: balance; }
.step > h2 .num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; flex: none;
  background: var(--ink); color: var(--page); font: 600 15px var(--sans); }
.kicker { margin: 0; font: 600 12px var(--sans); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

/* controls */
.bar { display: flex; flex-wrap: wrap; gap: 14px 24px; align-items: end; }
.ctl { display: grid; gap: 4px; }
.ctl > span, .lbl { font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
select, input[type=number], input[type=text] {
  font: 500 14px var(--sans); color: var(--ink); background: var(--field); border: 1px solid var(--line);
  border-radius: 6px; padding: 6px 8px; min-width: 0;
}
input[type=number] { width: 4.6em; font-family: var(--mono); }
input.dmg { width: 9.5em; font-family: var(--mono); }
input.small { width: 6.5em; font-family: var(--mono); }
input.bad { border-color: var(--bad); box-shadow: 0 0 0 1px var(--bad); }
::placeholder { color: var(--muted); opacity: 0.7; font-style: italic; }
select:focus-visible, input:focus-visible, button:focus-visible, a:focus-visible, summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.seg button { font: 500 14px var(--sans); color: var(--ink-2); background: var(--field); border: 0; padding: 6px 12px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--page); }
.topnav .seg button { font-size: 13px; padding: 4px 10px; }
.acrow { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.acrow input[type=range] { width: min(240px, 50vw); accent-color: var(--series-a); }
.icon-btn { background: var(--field); border: 1px solid var(--line); color: var(--ink-2); border-radius: 6px; padding: 5px 10px; font: 500 13px var(--sans); cursor: pointer; }
.icon-btn:hover { color: var(--ink); border-color: var(--muted); }
.hint { margin: 0; color: var(--ink-2); font-size: 14px; max-width: 90ch; }
.hint b { color: var(--ink); }
.save-msg { font-size: 13px; color: var(--ink-2); }
.downloads { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.downloads .save-msg { margin-left: 4px; }

/* cards, tiles, charts */
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px; display: grid; gap: 10px; min-width: 0; }
.swatch { width: 12px; height: 12px; border-radius: 3px; flex: none; display: inline-block; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); gap: 12px; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; display: grid; gap: 8px; align-content: start; }
.tile .rows { display: grid; gap: 4px; }
.tile .row { display: flex; align-items: baseline; gap: 8px; }
.tile .row b { font: 600 22px var(--sans); white-space: nowrap; }
.tile .row small { color: var(--ink-2); font-size: 13px; overflow-wrap: anywhere; }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; align-self: center; }
.charts { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 500px), 1fr)); gap: 16px; }
figure { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 14px 8px; min-width: 0; }
figure h3 { font: 600 15px var(--sans); margin: 0; }
figure p { margin: 2px 0 6px; color: var(--ink-2); font-size: 13px; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 12.5px; color: var(--ink-2); margin: 2px 0 4px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend .swatch { width: 10px; height: 10px; }
/* chart legends are drawn inside the SVG by common.js (legendMark), so tooltips paint over them */
.plot { color: var(--ink-2); }
.plot svg { max-width: 100%; height: auto; overflow: visible; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
summary { cursor: pointer; font-weight: 500; }
.tablewrap { overflow-x: auto; margin-top: 10px; }
table { border-collapse: collapse; font: 13px var(--mono); font-variant-numeric: tabular-nums; }
th, td { padding: 3px 14px 3px 0; text-align: right; white-space: nowrap; }
th { color: var(--muted); font-weight: 500; font-family: var(--sans); }
.rules { display: grid; gap: 10px; max-width: 80ch; }
.rules h2 { margin: 0; font: 600 16px var(--sans); }
.rules p { margin: 0; color: var(--ink-2); font-size: 13.5px; }
.rules b { color: var(--ink); font-weight: 600; }
.foot { color: var(--muted); font-size: 12.5px; margin: 0; max-width: 80ch; }