/* ==========================================================================
   Styles for the farm-to-label page.

   Why this file looks the way it does
   -----------------------------------
   The page is a short data story, read top to bottom, most often on a phone.
   So the layout is one column at every width, and the only things that get
   wider on a big screen are the two charts. There is no grid framework and no
   build step, because a single stylesheet is easier to read than a
   configuration file that generates one.

   Every colour is declared once as a custom property (a "CSS variable") on
   :root, and redeclared for dark mode in one place near the top. Nothing below
   that block mentions a raw hex value. That means a colour change is a
   one-line change, and light and dark cannot drift apart.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */

:root {
  color-scheme: light;

  /* Surfaces, from the page backdrop up to a raised card. */
  --surface-page: #f7f7f5;
  --surface-1: #fcfcfb;
  --surface-2: #f0efec;
  --border: #dcdbd6;
  --border-strong: #bab9b2;

  /* Ink. Text never wears a series colour, so these four carry all type. */
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #7a7973;
  --text-inverse: #fcfcfb;

  /* Categorical series colours, one per parent_type.
     These are assigned in a fixed order and are never cycled or reassigned:
     a filter that hides some types must not repaint the ones left on screen.

     The set was checked with a colour-vision validator in both modes. In
     light mode three of them fall below 3:1 contrast against the surface,
     which is allowed only when identity is also carried by something other
     than colour. It is: every node in the tree is directly labelled, every
     marker on the map has a text tooltip, and the brand table below states
     each owner in words. */
  --type-public_company: #2a78d6;    /* blue    */
  --type-private_company: #eb6834;   /* orange  */
  --type-private_equity: #1baf7a;    /* aqua    */
  --type-cooperative: #eda100;       /* yellow  */
  --type-employee_owned: #e87ba4;    /* magenta */
  --type-family_owned: #008300;      /* green   */
  --type-independent: #4a3aa7;       /* violet  */

  /* A neutral for brand nodes in the tree. Brands are not a category here;
     the colour belongs to the owner, so the brand side stays grey. */
  --node-brand: #9b9a94;

  /* Reserved status colour, used only for the unverified flag. It never
     doubles as a series colour, and it always ships with a text label. */
  --flag: #d03b3b;
  --flag-surface: #fdeceb;

  /* Layout scale. One place to change the rhythm of the whole page. */
  --measure: 68ch;        /* comfortable reading width for body text */
  --wide: 1100px;         /* the charts are allowed this much room */
  --gutter: 16px;         /* the side margin promised on phones */
  --radius: 10px;
  --radius-sm: 6px;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Dark mode is a selected set of steps for a dark surface, not an inversion
   of the light one. The same seven hues, restepped and revalidated against
   the dark background. */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --surface-page: #141413;
    --surface-1: #1a1a19;
    --surface-2: #24241f;
    --border: #383835;
    --border-strong: #55554f;

    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #96958c;
    --text-inverse: #141413;

    --type-public_company: #3987e5;
    --type-private_company: #d95926;
    --type-private_equity: #199e70;
    --type-cooperative: #c98500;
    --type-employee_owned: #d55181;
    --type-family_owned: #008300;
    --type-independent: #9085e9;

    --node-brand: #6f6e68;

    --flag: #e66767;
    --flag-surface: #3a1f1f;
  }
}

/* --------------------------------------------------------------------------
   2. Reset and base
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  /* Stops iOS Safari inflating text in landscape. */
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  /* An explicit background, so the page never inherits a white default in
     dark mode and flash-blinds the reader. */
  background: var(--surface-page);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  /* No horizontal page scroll at any width. Individual wide elements scroll
     inside themselves instead. */
  overflow-x: hidden;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 0 0 0.5em;
  font-weight: 650;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.9rem, 5.5vw, 3rem);
}

h2 {
  font-size: clamp(1.3rem, 3.5vw, 1.75rem);
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

p {
  margin: 0 0 1em;
}

a {
  color: inherit;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-color: currentColor;
}

/* A visible focus ring on every interactive thing, for keyboard users. */
:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
  border-radius: 3px;
}

/* --------------------------------------------------------------------------
   3. Page scaffolding
   -------------------------------------------------------------------------- */

.wrap {
  /* One column width for the whole page, so every section shares the same
     left edge. The charts and the table use all of it. Text does not: a
     90-character line is hard to read, so the text blocks below cap
     themselves at --measure instead. Constraining the container was tried
     first, and it left the prose and the tiles starting at different x
     positions, which reads as a misalignment. */
  width: 100%;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Everything that is read as prose rather than scanned as data. */
.hero h1,
.hero__answer,
.hero__asof,
.lede,
.prose,
footer p {
  max-width: var(--measure);
}

section {
  padding: 2.75rem 0;
}

section + section {
  border-top: 1px solid var(--border);
}

/* The tiles restate the headline, so they belong close to it rather than a
   full section's breathing room away. */
.section--tight {
  padding-top: 0.5rem;
}

.eyebrow {
  /* The small label above a section heading. */
  display: block;
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.lede {
  font-size: 1.15rem;
  color: var(--text-secondary);
}

.note {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   4. Hero: the headline and the one-sentence answer
   -------------------------------------------------------------------------- */

.hero {
  padding: 3.5rem 0 1.5rem;
}

.hero__answer {
  font-size: clamp(1.15rem, 3.2vw, 1.4rem);
  line-height: 1.5;
  color: var(--text-primary);
  margin: 0 0 1.25rem;
}

/* The number inside the answer sentence, so the eye lands on it. */
.hero__answer strong {
  font-weight: 700;
}

.hero__asof {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   5. Summary tiles
   -------------------------------------------------------------------------- */

.tiles {
  display: grid;
  /* Four tiles, and the column count is chosen so they never leave a single
     orphan on its own row. Above 900px all four sit in one row; between 560
     and 900 they go two by two; below that, one per row. auto-fit alone was
     tried first and produced a 3 + 1 split at the reading width, which reads
     as a mistake. */
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (max-width: 900px) {
  .tiles {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tile {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
}

.tile__value {
  display: block;
  /* Tabular figures so a column of numbers lines up. */
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.tile__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.tile__sub {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   6. Legend, shared by the tree and the map
   -------------------------------------------------------------------------- */

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
}

.legend__item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-secondary);
}

.legend__swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex: 0 0 auto;
  /* A hairline ring so a pale swatch is still visible on a pale surface. */
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.15);
}

/* --------------------------------------------------------------------------
   7. Ownership tree (D3 Sankey)
   -------------------------------------------------------------------------- */

.chart-frame {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
}

.chart-scroll {
  /* On a narrow screen the tree keeps its minimum readable width and scrolls
     sideways inside this box, rather than squashing its labels or forcing the
     whole page to scroll. */
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

#tree svg {
  display: block;
  /* Set by tree.js; declared here so the element has a size before script
     runs and the layout does not jump. */
  height: auto;
}

/* Sankey link. Translucent, and it changes opacity on hover rather than
   colour, so the colour keeps meaning only one thing.

   Deliberately no `stroke` here. tree.js sets each ribbon's stroke to its
   owner's colour as a presentation attribute, and a class rule like this one
   beats a presentation attribute on specificity. Declaring a stroke here
   silently repainted every ribbon grey and threw away the colour encoding.
   The bug was invisible until the chart was rendered in a real browser. */
.sankey__link {
  fill: none;
  stroke-opacity: 0.38;
  transition: stroke-opacity 120ms ease;
}

.sankey__link.is-active {
  stroke-opacity: 0.85;
}

.sankey__link.is-dimmed {
  stroke-opacity: 0.1;
}

/* Sankey node. A 2px surface-coloured ring separates touching nodes, which
   is what keeps two stacked colours from reading as one shape. */
.sankey__node {
  stroke: var(--surface-1);
  stroke-width: 2;
  cursor: pointer;
  transition: opacity 120ms ease;
}

.sankey__node.is-dimmed {
  opacity: 0.25;
}

.sankey__label {
  font-size: 11px;
  fill: var(--text-secondary);
  pointer-events: none;
  transition: fill 120ms ease;
}

.sankey__label--parent {
  font-weight: 620;
  fill: var(--text-primary);
}

.sankey__label.is-active {
  fill: var(--text-primary);
  font-weight: 650;
}

.sankey__label.is-dimmed {
  fill: var(--text-muted);
  opacity: 0.4;
}

.sankey__axis-label {
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  fill: var(--text-muted);
}

/* --------------------------------------------------------------------------
   8. Tooltip, shared by the tree and the map
   -------------------------------------------------------------------------- */

.tooltip {
  position: fixed;
  z-index: 40;
  max-width: min(320px, calc(100vw - 2 * var(--gutter)));
  background: var(--surface-1);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: 0 6px 24px rgb(0 0 0 / 0.14);
  padding: 0.7rem 0.8rem;
  font-size: 0.85rem;
  line-height: 1.45;
  pointer-events: none;
  opacity: 0;
  transition: opacity 100ms ease;
}

.tooltip.is-visible {
  opacity: 1;
}

.tooltip__title {
  font-weight: 680;
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

.tooltip__row {
  display: block;
  color: var(--text-secondary);
  margin-bottom: 0.15rem;
}

.tooltip__row b {
  color: var(--text-primary);
  font-weight: 620;
}

.tooltip__chain {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin: 0.35rem 0 0.2rem;
  word-break: break-word;
}

.tooltip__hint {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   9. Controls: the map toggle and the table search
   -------------------------------------------------------------------------- */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 3px;
}

.segmented__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  font-size: 0.85rem;
  /* A 40px tall target, comfortably bigger than the text inside it. */
  min-height: 34px;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
}

.segmented__btn:hover {
  color: var(--text-primary);
}

.segmented__btn[aria-pressed="true"] {
  background: var(--surface-1);
  color: var(--text-primary);
  font-weight: 620;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.08);
}

.search {
  flex: 1 1 220px;
  min-width: 0;
}

.search input {
  width: 100%;
  min-height: 40px;
  padding: 0.5rem 0.7rem;
  font: inherit;
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.search input::placeholder {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   10. Map
   -------------------------------------------------------------------------- */

#map {
  height: 520px;
  border-radius: var(--radius);
  /* Leaflet paints tiles into this box, so it needs an explicit background
     for the moment before they load. */
  background: var(--surface-2);
  border: 1px solid var(--border);
}

/* Leaflet's own controls and attribution, nudged to match the page. */
.leaflet-container {
  font-family: var(--font-body);
  font-size: 0.8rem;
}

.leaflet-container .leaflet-control-attribution {
  background: rgb(252 252 251 / 0.85);
  color: #52514e;
}

.leaflet-container .leaflet-control-attribution a {
  color: #2a78d6;
}

/* The origin-to-headquarters line. Thin by default, thicker when its brand
   is selected in the tree. */
.map__line {
  stroke-dasharray: 3 4;
}

.map__marker--selected {
  /* A surface-coloured ring on the selected marker, so it separates from
     whatever is under it. */
  filter: drop-shadow(0 0 0 var(--surface-1));
}

/* --------------------------------------------------------------------------
   11. Brand table
   -------------------------------------------------------------------------- */

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-1);
}

table {
  width: 100%;
  /* Ten columns, one of which carries a sentence of evidence. At 760px the
     evidence column squeezed to about twenty characters wide and every row
     grew into a tall thin strip, so the minimum is set from the content
     rather than from the viewport. The table scrolls sideways inside its own
     box, so a wide minimum costs the page nothing. */
  min-width: 1180px;
  border-collapse: collapse;
  font-size: 0.88rem;
}

/* The evidence cell is the only one with prose in it. It gets a real column
   width, and long quotes are clamped to four lines with the full text on the
   cell's title attribute, so one wordy row cannot make the table unreadable. */
.cell-evidence {
  max-width: 320px;
  min-width: 260px;
}

.cell-evidence__text {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: 0.3rem;
}

thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface-2);
  text-align: left;
  font-weight: 650;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 0;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

thead th button {
  appearance: none;
  border: 0;
  background: transparent;
  font: inherit;
  color: inherit;
  cursor: pointer;
  width: 100%;
  text-align: left;
  padding: 0.7rem 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

thead th button:hover {
  color: var(--text-primary);
}

/* The sort arrow. It is a text character rather than an icon font, so it
   needs no extra request and inherits colour automatically. */
.sort-arrow {
  font-size: 0.7em;
  color: var(--text-muted);
}

th[aria-sort] .sort-arrow {
  color: var(--text-primary);
}

tbody td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  color: var(--text-secondary);
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover td {
  background: var(--surface-2);
}

tbody tr.is-selected td {
  background: var(--surface-2);
  box-shadow: inset 3px 0 0 var(--text-primary);
}

.cell-brand {
  color: var(--text-primary);
  font-weight: 620;
  white-space: nowrap;
}

.cell-owner {
  color: var(--text-primary);
}

.cell-date {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  color: var(--text-muted);
}

/* The coloured dot that ties a table row to its colour in the tree. */
.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-right: 0.45rem;
  vertical-align: 0.05em;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.15);
}

.pill {
  display: inline-block;
  font-size: 0.72rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  white-space: nowrap;
}

/* The unverified flag. Colour plus a word, never colour alone. */
.flag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 650;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: var(--flag-surface);
  border: 1px solid var(--flag);
  color: var(--flag);
  white-space: nowrap;
}

/* The narrower gap badge. Same shape as .flag so it reads as the same kind
   of thing, but in ink rather than the reserved status colour, because it is
   a note about sourcing rather than a warning about the claim. */
.flag--minor {
  background: var(--surface-2);
  border-color: var(--border-strong);
  color: var(--text-secondary);
}

.sources {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.sources a {
  font-size: 0.78rem;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  text-decoration: none;
  color: var(--text-secondary);
  white-space: nowrap;
}

.sources a:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.table-status {
  padding: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   12. Method and limits
   -------------------------------------------------------------------------- */

.prose h3 {
  margin-top: 1.5rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1em;
  padding-left: 1.2rem;
}

.prose li {
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}

.prose li b {
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */

footer {
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer p {
  margin-bottom: 0.5rem;
}

/* --------------------------------------------------------------------------
   14. Loading and error states
   -------------------------------------------------------------------------- */

.state {
  padding: 2rem 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.state--error {
  color: var(--flag);
}

/* Visually hidden but still read aloud by a screen reader. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   15. Narrow screens
   -------------------------------------------------------------------------- */

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  section {
    padding: 2rem 0;
  }

  .hero {
    padding: 2.5rem 0 1.75rem;
  }

  /* One tile per row reads better than two cramped ones. */
  .tiles {
    grid-template-columns: 1fr;
  }

  /* A shorter map, so it does not fill the whole screen and trap scrolling. */
  #map {
    height: 380px;
  }

  .segmented {
    width: 100%;
  }

  .segmented__btn {
    flex: 1 1 auto;
    text-align: center;
    justify-content: center;
  }
}

/* Respect a reader who has asked for less movement. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}