/* calc.fakemap.com: one page, no framework, no dark-mode toggle (the media query
   does the one thing worth doing). Mobile first: 380px is the floor, not an
   afterthought. No transitions anywhere the chart lives, so
   `prefers-reduced-motion` has nothing to disable there. */

:root {
  --ink: #14161a;
  --ink-soft: #5a616e;
  --rule: #dfe3eb;
  --paper: #fdfdfb;
  --accent: #0b6b52;
  --accent-soft: #e3f2ec;
  --warn: #8a5a00;
  --seg: #9aa4b2;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --measure: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eceef3;
    --ink-soft: #a4acba;
    --rule: #2b3038;
    --paper: #14161a;
    --accent: #58d3ab;
    --accent-soft: #16302a;
    --warn: #e2b04a;
    --seg: #6d7787;
  }
}

* { box-sizing: border-box; }

/* `hidden` has to beat every layout rule below it, including the ones that set
   `display` on a class the element also carries. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.55 var(--sans);
}

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.25rem 1rem 4rem;
}

h1 { font-size: 1.6rem; line-height: 1.2; margin: 0 0 .5rem; letter-spacing: -.01em; }
h2 { font-size: 1.05rem; margin: 2rem 0 .5rem; letter-spacing: -.005em; }
h3 { font-size: .95rem; margin: 1.5rem 0 .4rem; }
p, li { max-width: 40rem; }
a { color: var(--accent); text-underline-offset: 2px; }

.lede { color: var(--ink-soft); margin: 0; }
.hint { color: var(--ink-soft); font-size: .85rem; margin: .3rem 0 .75rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---- controls ---- */

.controls { margin-top: 1.5rem; }

.field { margin: 0 0 1rem; }

.field label {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: .4rem;
  font-weight: 600; font-size: .92rem;
}

.field output { font-family: var(--mono); font-size: .9rem; font-weight: 400; color: var(--ink); }

select {
  width: 100%; margin-top: .35rem; padding: .55rem .6rem;
  font: inherit; color: var(--ink); background: var(--paper);
  border: 1px solid var(--rule); border-radius: .4rem;
}

input[type="range"] {
  width: 100%; margin: .5rem 0 0; accent-color: var(--accent);
  /* a 44px touch target without changing the painted track */
  height: 2.75rem;
}

.pacing {
  margin: 1.5rem 0 0; padding: .75rem .9rem 1rem;
  border: 1px solid var(--rule); border-radius: .5rem;
}

.pacing legend { padding: 0 .35rem; font-weight: 700; font-size: .92rem; }

.tag {
  font-family: var(--mono); font-size: .7rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--warn);
  border: 1px solid currentColor; border-radius: 999px;
  padding: .05rem .4rem; font-weight: 500;
}

/* ---- answer ---- */

.verdict {
  margin: .25rem 0 .5rem; padding: .7rem .8rem;
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  border-radius: 0 .35rem .35rem 0; font-size: .97rem;
}
.lock { color: var(--ink-soft); font-size: .85rem; margin: .2rem 0 0; }

/* ---- chart ---- */

.chart-block figure { margin: 0; }

#chart {
  /* No fixed aspect ratio: app.js sets a viewBox equal to the container's width, so
     the drawing is 1:1 with CSS pixels and the labels are the size they claim. */
  width: 100%; height: auto;
  display: block; overflow: visible;
}

#chart .grid { stroke: var(--rule); stroke-width: 1; }
#chart .axis { fill: var(--ink-soft); font: 11px var(--mono); }
#chart .axis-label { fill: var(--ink-soft); font: 11px var(--sans); }

#chart .seg-track { stroke: var(--rule); stroke-width: 1; }
#chart .seg { stroke: var(--seg); stroke-width: 9; stroke-linecap: butt; }
#chart .seg.win { stroke: var(--accent); stroke-width: 11; }
#chart .stop { stroke: var(--seg); stroke-width: 2.5; }
#chart .stop.win { stroke: var(--accent); stroke-width: 3; }
/* A halo in the page colour keeps the demand rule from cutting through the glyphs:
   at 380px the row labels and the dashed line share the same band. */
#chart .seg-label { fill: var(--ink); font: 12px var(--sans); paint-order: stroke; stroke: var(--paper); stroke-width: 3px; }
#chart .seg-value { fill: var(--ink-soft); font: 11px var(--mono); paint-order: stroke; stroke: var(--paper); stroke-width: 3px; }
#chart .seg-value.win { fill: var(--accent); }
#chart .seg-label.win { font-weight: 700; fill: var(--accent); }
#chart .dead-label { fill: var(--warn); font: 10px var(--mono); }
#chart .demand { stroke: var(--ink-soft); stroke-width: 1; stroke-dasharray: 3 4; opacity: .8; }
#chart .demand-label { fill: var(--ink); font: 11px var(--mono); }

/* ---- table ---- */

table { width: 100%; border-collapse: collapse; font-size: .86rem; margin-top: .5rem; }
th, td { text-align: left; padding: .5rem .45rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
thead th { font-size: .74rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-soft); font-weight: 600; }
tbody th { font-weight: 600; }
td { font-family: var(--mono); }
tr.winner th, tr.winner td { background: var(--accent-soft); }
tr.winner th::after { content: " cheapest covering"; color: var(--accent); font-weight: 400; font-size: .75rem; }

.notes { margin: .9rem 0 0; padding-left: 1.1rem; font-size: .85rem; color: var(--ink-soft); }
.notes li { margin-bottom: .35rem; }

/* ---- would-have-to-be-true ---- */

.would { padding-left: 1.1rem; }
.would li { margin-bottom: .6rem; font-size: .9rem; }
.would .caveat { color: var(--ink-soft); font-size: .82rem; }

/* ---- assumptions ---- */

.assumptions { margin-top: 2.5rem; border-top: 1px solid var(--rule); padding-top: .5rem; }
.boundary {
  font-size: .9rem; padding: .7rem .8rem; border: 1px dashed var(--rule); border-radius: .4rem;
}
.assumption-list { padding-left: 1.1rem; font-size: .88rem; }
.assumption-list li { margin-bottom: .4rem; }

.sources { padding-left: 1.1rem; font-size: .85rem; }
.sources li { margin-bottom: .7rem; }
.sources code, .discrepancies code {
  font-family: var(--mono); font-size: .78rem; word-break: break-all;
}
.staleness { font-size: .85rem; color: var(--ink-soft); }

.discrepancies { width: 100%; font-size: .82rem; }
.discrepancies th, .discrepancies td { padding: .4rem .35rem; }
.discrepancies td { font-family: var(--sans); }

details summary { cursor: pointer; font-size: .9rem; font-weight: 600; margin: .75rem 0 .5rem; }

footer { margin-top: 3rem; border-top: 1px solid var(--rule); padding-top: 1rem; }
footer p { font-size: .82rem; color: var(--ink-soft); }

/* ---- 380px: stack the table into labelled rows ---- */

@media (max-width: 560px) {
  thead { display: none; }
  tbody tr { display: block; padding: .5rem 0; border-bottom: 1px solid var(--rule); }
  tbody th, tbody td { display: flex; justify-content: space-between; gap: 1rem; border: 0; padding: .15rem 0; }
  tbody td::before {
    content: attr(data-label);
    font-family: var(--sans); font-size: .72rem; text-transform: uppercase;
    letter-spacing: .05em; color: var(--ink-soft); font-weight: 600;
  }
  tr.winner th::after { display: block; }
}