/* Benford check — one sans, one monospace with tabular figures, neutral ground,
   one accent; colour beyond that only for the four conformity levels. */
:root {
  --bg: #f4f4f1;
  --panel: #ffffff;
  --ink: #17191c;
  --ink-2: #40454c;
  --muted: #646a73;
  --line: #d9d9d4;
  --line-2: #ebebe6;
  --bar: #9aa0a8;
  --accent: #1d4f91;
  --accent-ink: #ffffff;
  --accent-soft: #e3ebf6;
  --close: #1e7146;
  --acceptable: #50731c;
  --marginal: #965400;
  --nonconformity: #b0261c;
  --focus: #1d4f91;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --panel: #1a1d21;
    --ink: #e8e9eb;
    --ink-2: #c3c6cb;
    --muted: #9aa0a8;
    --line: #33373d;
    --line-2: #262a2f;
    --bar: #6b717a;
    --accent: #8db4ef;
    --accent-ink: #0d1b2e;
    --accent-soft: #1d2a3c;
    --close: #5fc98f;
    --acceptable: #a8c86a;
    --marginal: #eaa64e;
    --nonconformity: #ff8476;
    --focus: #8db4ef;
    color-scheme: dark;
  }
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.55 var(--sans); }
a { color: var(--accent); text-underline-offset: 2px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 16px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.num, .mono, dd, .chip, .digit, .ytick, .xtick, .seltick, table.data td.num, .big { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

/* header */
.top { border-bottom: 1px solid var(--line); background: var(--panel); }
.top .bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 16px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; color: var(--ink); text-decoration: none; letter-spacing: .01em; }
.brand .b1 { fill: var(--accent); } .brand .b2 { fill: var(--bar); }
.top nav { display: flex; gap: 16px; font-size: 14px; }
.top nav a { color: var(--ink-2); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.top nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }

/* intro */
.intro { padding: 24px 0 8px; }
h1 { font-size: 26px; line-height: 1.2; font-weight: 600; margin: 0 0 12px; letter-spacing: -.01em; }
h2 { font-size: 19px; font-weight: 600; margin: 0 0 12px; }
h3 { font-size: 17px; font-weight: 600; margin: 0; }
h4 { font-size: 16px; font-weight: 600; margin: 0; }
.lede { color: var(--ink-2); margin: 0 0 12px; max-width: 68ch; }
.privacy { margin: 0; padding: 10px 12px; border-left: 3px solid var(--accent); background: var(--panel); max-width: 68ch; font-size: 15px; }

/* panels */
.panel, .card { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 16px; margin: 16px 0; }
.drop { border: 1.5px dashed var(--line); border-radius: 6px; padding: 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.dropnote { color: var(--muted); font-size: 14px; }
button, .primary, .secondary { font: inherit; }
.primary, .secondary { display: inline-block; border-radius: 5px; padding: 9px 16px; cursor: pointer; font-weight: 500; font-size: 15px; line-height: 1.3; text-align: center; }
.primary { background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent); }
.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.linkbtn { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; text-decoration: underline; text-underline-offset: 2px; font: inherit; }
.paste { margin-top: 12px; }
.paste summary { cursor: pointer; color: var(--ink-2); font-size: 15px; }
.paste textarea { display: block; width: 100%; margin: 8px 0; font: 14px/1.4 var(--mono); padding: 8px; border: 1px solid var(--line); border-radius: 5px; background: var(--bg); color: var(--ink); resize: vertical; }
.samplenote { font-size: 14px; color: var(--muted); margin: 12px 0 0; }
.controls { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line-2); }
.controls .wide, .controls label.check { grid-column: 1 / -1; }
.controls label { display: flex; min-width: 0; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.controls label.check { flex-direction: row; align-items: center; gap: 8px; font-size: 15px; color: var(--ink); }
.controls input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); }
select { font: 15px var(--sans); color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 5px; padding: 8px; width: 100%; max-width: 100%; }
#status { font-size: 14px; margin: 12px 0 0; min-height: 1.4em; color: var(--muted); }
#status.err { color: var(--nonconformity); }
.busy #status::after { content: ''; display: inline-block; width: 1.2em; }
.datasum p { margin: 6px 0 0; font-size: 14px; color: var(--ink-2); overflow-wrap: anywhere; }
.datasum .big { font-size: 20px; color: var(--ink); font-weight: 500; }
.warn { color: var(--marginal) !important; }

/* results */
.reminder { margin: 0 0 12px; font-size: 15px; color: var(--ink-2); }
.tablewrap { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
table.data { border-collapse: collapse; width: 100%; font-size: 14px; }
table.data th { text-align: left; font-weight: 500; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; padding: 6px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.data td { padding: 6px 8px; border-bottom: 1px solid var(--line-2); white-space: nowrap; }
table.data td.num { text-align: right; }
table.data caption { text-align: left; font-size: 13px; color: var(--muted); padding: 0 0 4px; }
table.data tbody tr[class], table.data tbody tr { cursor: default; }
table.data tbody tr:has(.linkbtn) { cursor: pointer; }
table.data tbody tr:hover { background: var(--line-2); }
tr.sigrow td:last-child { color: var(--accent); font-weight: 500; }
.overview { background: var(--panel); border: 1px solid var(--line); }
.overview td:first-child a { color: var(--ink); }
.chip { display: inline-block; font-size: 12px; line-height: 1.2; padding: 3px 7px; border-radius: 4px; border: 1px solid currentColor; white-space: nowrap; font-family: var(--sans); font-weight: 500; }
.chip.close { color: var(--close); background: color-mix(in srgb, var(--close) 10%, transparent); }
.chip.acceptable { color: var(--acceptable); background: color-mix(in srgb, var(--acceptable) 10%, transparent); }
.chip.marginal { color: var(--marginal); background: color-mix(in srgb, var(--marginal) 10%, transparent); }
.chip.nonconformity { color: var(--nonconformity); background: color-mix(in srgb, var(--nonconformity) 10%, transparent); }
.chip.none { color: var(--muted); }
.cardhead { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 12px; }
.what { color: var(--ink-2); font-size: 14px; margin: 6px 0 10px; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; margin: 0 0 8px; }
.stats div { min-width: 0; }
.stats dt { font-size: 12px; color: var(--muted); }
.stats dd { margin: 0; font-size: 14px; overflow-wrap: anywhere; }
.ranges { font-size: 12.5px; color: var(--muted); margin: 0 0 10px; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 12.5px; color: var(--ink-2); margin-bottom: 4px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { display: inline-block; width: 12px; height: 10px; }
.sw.obs { background: var(--bar); }
.sw.sig { background: var(--accent); }
.sw.exp { height: 0; border-top: 2px solid var(--ink); }
.chartbox { width: 100%; }
svg.chart { display: block; max-width: 100%; height: auto; }
svg.chart.pickable { cursor: pointer; touch-action: manipulation; }
.chart .bar { fill: var(--bar); }
.chart .bar.sig { fill: var(--accent); }
.chart .bar.sel { fill: var(--ink); }
.chart .grid { stroke: var(--line-2); stroke-width: 1; }
.chart .axis { stroke: var(--line); stroke-width: 1; }
.chart .exp { stroke: var(--ink); stroke-width: 1.6; fill: none; }
.chart .expdot { fill: var(--panel); stroke: var(--ink); stroke-width: 1.5; }
.chart .ytick, .chart .xtick { fill: var(--muted); font-size: 11px; }
.chart .seltick { fill: var(--ink); font-size: 11px; font-weight: 500; }
.hint { font-size: 12.5px; color: var(--muted); margin: 4px 0 8px; }
.spikes { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 6px 0; font-size: 14px; }
.spikes .lab { color: var(--ink-2); margin-right: 4px; }
.digit { font-size: 13px; border: 1px solid var(--accent); color: var(--accent); background: transparent; border-radius: 4px; padding: 5px 8px; cursor: pointer; min-height: 32px; }
.digit:hover { background: var(--accent-soft); }
details.ztable { margin-top: 8px; }
details.ztable summary { cursor: pointer; font-size: 14px; color: var(--ink-2); padding: 4px 0; }
details.ztable .tablewrap { max-height: 420px; overflow-y: auto; margin-top: 6px; }
.drill { margin-top: 12px; padding: 12px; border: 1px solid var(--accent); border-radius: 6px; background: color-mix(in srgb, var(--accent-soft) 45%, var(--panel)); }
.drill p { margin: 6px 0; font-size: 14px; }
.drillhead { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.close { background: none; border: 1px solid var(--line); color: var(--ink-2); border-radius: 4px; padding: 4px 10px; cursor: pointer; font-size: 13px; }
.actions { margin: 10px 0; }
.cols2 { display: grid; grid-template-columns: 1fr; gap: 12px; margin: 8px 0; }
.cols2 table.data { width: auto; min-width: 60%; }
table.rows td { max-width: 18em; overflow: hidden; text-overflow: ellipsis; }

/* reading pages */
.prose { max-width: 70ch; }
.prose p, .prose li { color: var(--ink-2); }
.prose h2 { margin-top: 28px; }
.prose h3 { margin-top: 20px; margin-bottom: 6px; }
.prose code, .formula { font-family: var(--mono); font-size: 14px; }
.formula { display: block; padding: 8px 10px; background: var(--panel); border: 1px solid var(--line); border-radius: 5px; overflow-x: auto; white-space: nowrap; color: var(--ink); }
.refs li { margin-bottom: 8px; }
.callout { border-left: 3px solid var(--accent); padding: 8px 12px; background: var(--panel); color: var(--ink); }

/* footer */
.foot { border-top: 1px solid var(--line); margin-top: 32px; padding: 16px 0 32px; font-size: 13px; color: var(--muted); }
.foot p { margin: 6px 0; max-width: 80ch; }

@media (min-width: 720px) {
  h1 { font-size: 34px; }
  .intro { padding-top: 36px; }
  .stats { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .cols2 { grid-template-columns: 1fr 1fr; }
  .panel, .card { padding: 20px 24px; }
}
@media (min-width: 1000px) {
  .controls { grid-template-columns: 2fr 1fr 1fr 1.4fr; align-items: end; }
  .controls .wide { grid-column: auto; }
  .controls label.check { grid-column: 1 / -1; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }