/*
  Institutional, the Sable & Finch theme.

  A credit committee pack. Bone paper, navy ink, tight leading, dense tables, and no
  decoration whatsoever. Where Meridian's Ledger is a document you read once and Kestrel's
  Control Tower is a screen you glance at all day, this is a thing somebody has to defend
  line by line to a board, an auditor, or the National Credit Regulator. It should look like
  it expects to be checked.

  Three separate colour jobs, and they are not interchangeable:

    Categorical  branches and channels. Validated for lightness band, chroma floor, colour
                 vision separation and surface contrast. Worst adjacent pair clears delta E 17.9.
    Cohort ramp  disbursement month is ordered, so it takes a single hue running light to
                 dark rather than a set of unrelated colours. Validated as an ordinal ramp:
                 monotone lightness, visible gaps between steps, and a light end that still
                 clears the paper.
    Risk heat    arrears buckets are semantic heat, which is the one case where a multi hue
                 sequential scale is right. It always ships with a scale legend.
*/

:root {
  --paper:      #F7F6F3;
  --paper-2:    #EFEDE8;
  --panel:      #FFFFFF;
  --navy:       #1A3A5C;
  --ink:        #14212E;
  --ink-2:      #4A5A68;
  --ink-3:      #7A8894;
  --rule:       #DFDCD5;
  --rule-strong:#C6C2B8;

  /* Categorical, fixed order, never cycled */
  --s1: #1F6392;   /* navy blue */
  --s2: #B04F14;   /* rust      */
  --s3: #77419A;   /* plum      */
  --s4: #3C7C33;   /* moss      */

  /* Cohort ramp, oldest to newest. Ordered dimension, single hue. */
  --c1: #94ADC8;
  --c2: #7797B6;
  --c3: #5A7CA2;
  --c4: #405F87;
  --c5: #2A4769;
  --c6: #16354F;

  /* Arrears severity. Semantic heat, always with a scale legend. */
  --risk-0: #3C7C33;   /* current */
  --risk-1: #7D8A22;   /* 1-30    */
  --risk-2: #B0821A;   /* 31-60   */
  --risk-3: #B35A16;   /* 61-90   */
  --risk-4: #A3271F;   /* 90+     */

  --pos: #3C7C33;
  --neg: #A3271F;
  --neutral: #4A5A68;
  --warn: #B0821A;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
  --measure: 1180px;

  /* charts.js is shared across the demo projects and reads the token names the first one
     established. Aliasing here keeps one chart library working against four themes. */
  --font-serif: var(--font-sans);
  --paper-3: var(--paper-2);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 2rem; }

/* ---------------------------------------------------------------- masthead */

.masthead {
  border-bottom: 3px double var(--navy);
  padding: 2rem 0 1rem;
  margin-bottom: 2.25rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.masthead h1 {
  font-size: 1.62rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--navy);
  margin: 0 0 0.1rem;
}
.masthead .sub { color: var(--ink-2); font-size: 0.9rem; margin: 0; }
.masthead .meta {
  text-align: right;
  font-size: 0.78rem;
  color: var(--ink-3);
  font-family: var(--font-mono);
  line-height: 1.6;
}

.freshness { display: inline-flex; align-items: center; gap: 0.4rem; font-weight: 500; color: var(--ink-2); }
.fresh-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-3); flex: none; }
.freshness.is-current { color: var(--pos); }
.freshness.is-current .fresh-dot { background: var(--pos); }
.freshness.is-lagging { color: var(--warn); }
.freshness.is-lagging .fresh-dot { background: var(--warn); }
.freshness.is-stale { color: var(--neg); }
.freshness.is-stale .fresh-dot { background: var(--neg); }

/* ---------------------------------------------------------------- sections */

section { margin: 0 0 3.25rem; }

.section-head {
  border-top: 1px solid var(--navy);
  padding-top: 0.7rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}
.section-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-3);
  letter-spacing: 0.08em;
}
.section-head h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.01em;
  margin: 0;
}
.lede { color: var(--ink-2); max-width: 76ch; margin: 0 0 1.35rem; font-size: 0.96rem; }
.lede b, .lede strong { color: var(--ink); font-weight: 600; }

/* ---------------------------------------------------------------- figures */

.hero { display: flex; align-items: baseline; gap: 1.1rem; flex-wrap: wrap; margin: 1.4rem 0 0.4rem; }
.hero-value {
  font-family: var(--font-sans);
  font-size: 3.9rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--neg);
}
.hero-label { color: var(--ink-2); font-size: 1rem; max-width: 34ch; }

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  border: 1px solid var(--rule-strong);
  background: var(--panel);
  margin: 1.6rem 0;
}
.tile { padding: 0.85rem 1.1rem; border-right: 1px solid var(--rule); }
.tile:last-child { border-right: none; }
.tile-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.2rem;
}
.tile-value { font-family: var(--font-mono); font-size: 1.32rem; font-weight: 500; line-height: 1.2; }
.tile-delta { font-size: 0.78rem; color: var(--ink-3); margin-top: 0.1rem; }
.tile-delta .up { color: var(--pos); }
.tile-delta .down { color: var(--neg); }

.figure { margin: 1.4rem 0; }
.figure-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: 0.15rem; }
.figure-title { font-size: 1rem; font-weight: 600; color: var(--navy); margin: 0; }
.figure-note { color: var(--ink-3); font-size: 0.83rem; margin: 0 0 0.85rem; max-width: 80ch; }

.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }

.legend { display: flex; gap: 1rem; flex-wrap: wrap; margin: 0.35rem 0 0.8rem; font-size: 0.82rem; color: var(--ink-2); }
.legend-item { display: inline-flex; align-items: center; gap: 0.4rem; }
.legend-key { width: 11px; height: 11px; border-radius: 2px; flex: none; }
.legend-key.line { height: 2px; width: 17px; border-radius: 1px; }

/* A continuous scale needs a scale legend, not a set of swatches. */
.scale-legend { display: flex; align-items: center; gap: 0.5rem; margin: 0.35rem 0 0.9rem; font-size: 0.8rem; color: var(--ink-3); }
.scale-swatches { display: flex; }
.scale-swatches span { width: 26px; height: 11px; }

.tbl-toggle {
  background: none;
  border: 1px solid var(--rule-strong);
  color: var(--ink-3);
  font: inherit;
  font-size: 0.76rem;
  padding: 0.1rem 0.5rem;
  cursor: pointer;
}
.tbl-toggle:hover { color: var(--navy); border-color: var(--ink-3); }

/* ---------------------------------------------------------------- tables */

table { border-collapse: collapse; width: 100%; font-size: 0.85rem; margin: 0.55rem 0 0; background: var(--panel); }
caption { text-align: left; color: var(--ink-3); font-size: 0.79rem; padding-bottom: 0.4rem; }
th, td { padding: 0.42rem 0.8rem; text-align: left; border-bottom: 1px solid var(--rule); }
th {
  font-size: 0.71rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 600;
  border-bottom: 1.5px solid var(--navy);
  white-space: nowrap;
  background: var(--paper-2);
}
td.num, th.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
tbody tr:nth-child(even) { background: var(--paper); }
tr.total td { border-top: 1.5px solid var(--navy); border-bottom: none; font-weight: 600; background: var(--paper-2); }
.neg { color: var(--neg); }
.pos { color: var(--pos); }
.warn { color: var(--warn); }
.muted { color: var(--ink-3); }
.data-table[hidden] { display: none; }

.flag {
  display: inline-block;
  border: 1px solid currentColor;
  padding: 0 0.4rem;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
}

.callout {
  border-left: 3px solid var(--navy);
  background: var(--panel);
  padding: 0.9rem 1.1rem;
  margin: 1.2rem 0;
  font-size: 0.92rem;
  color: var(--ink-2);
  border-radius: 0;
}
.callout b { color: var(--ink); }
.callout.statute { border-left-color: var(--neg); }

/* ---------------------------------------------------------------- tooltip */

.tip {
  position: fixed; pointer-events: none; z-index: 40;
  background: var(--panel);
  border: 1px solid var(--rule-strong);
  padding: 0.5rem 0.7rem;
  font-size: 0.81rem;
  line-height: 1.5;
  color: var(--ink);
  max-width: 290px;
  opacity: 0;
  transition: opacity 0.1s;
  box-shadow: 0 2px 8px rgb(20 33 46 / 0.10);
}
.tip[data-show] { opacity: 1; }
.tip b { font-weight: 600; }
.tip .tip-row { display: flex; justify-content: space-between; gap: 1.2rem; }
.tip .tip-row span:last-child { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- states */

.loading { padding: 5rem 0; text-align: center; color: var(--ink-3); }
.err { border-left: 3px solid var(--neg); padding: 0.85rem 1.1rem; background: var(--panel); margin: 2rem 0; }

footer {
  border-top: 3px double var(--navy);
  margin-top: 3rem;
  padding: 1.4rem 0 3.5rem;
  color: var(--ink-3);
  font-size: 0.82rem;
}
footer p { margin: 0 0 0.5rem; max-width: 80ch; }
.badge {
  display: inline-block;
  border: 1px solid var(--rule-strong);
  padding: 0.05rem 0.45rem;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
}

@media (max-width: 760px) {
  .wrap { padding: 0 1rem; }
  .hero-value { font-size: 2.7rem; }
  .masthead .meta { text-align: left; }
  .tile { border-right: none; border-bottom: 1px solid var(--rule); }
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }