/* ============================================================
   CFR Brand — CSS Custom Properties
   Source: CFR Brand Bible
   Version: 2026-04-17
   ------------------------------------------------------------
   Drop-in stylesheet for any HTML / CSS context. Link this file
   once and reference variables anywhere in your stylesheet,
   e.g. `color: var(--cfr-copper);`
   ============================================================ */

:root {
  /* ---------- Signature palette ---------- */
  --cfr-copper:        #8F3602;   /* Primary signature - never large bg fill */
  --cfr-viridian:      #037956;   /* Secondary signature - never large bg fill */
  --cfr-black:         #000000;
  --cfr-white:         #FFFFFF;
  --cfr-sand:          #F0E4D8;   /* Warm off-white background */

  /* ---------- Secondary palette ---------- */
  --cfr-light-copper:  #FFCAA7;   /* Pairs with Copper */
  --cfr-dune:          #D7AE73;   /* Warm neutral */
  --cfr-water:         #D6E6E1;   /* Cool neutral, pairs with Viridian */

  /* ---------- Data viz categorical ---------- */
  --cfr-data-copper:        #A63D00;  /* Most-important category in charts */
  --cfr-data-viridian:      #046953;
  --cfr-light-copper-data:  #EE8244;
  --cfr-light-viridian:     #85B1A8;
  --cfr-dark-brown:         #62512E;
  --cfr-light-brown:        #B9AA82;
  --cfr-gray:               #A4A4A4;  /* "Unimportant Gray" - the de-emphasis workhorse */

  /* ---------- Data viz sequential — Copper ---------- */
  --cfr-seq-copper-1: #F7AA74;
  --cfr-seq-copper-2: #C6621E;
  --cfr-seq-copper-3: #A63D00;
  --cfr-seq-copper-4: #881E00;
  --cfr-seq-copper-5: #4B0000;

  /* ---------- Data viz sequential — Viridian ---------- */
  --cfr-seq-viridian-1: #9DD4C9;
  --cfr-seq-viridian-2: #5FA999;
  --cfr-seq-viridian-3: #217E6A;
  --cfr-seq-viridian-4: #035145;
  --cfr-seq-viridian-5: #00272B;

  /* ---------- UI helpers ---------- */
  --cfr-chart-panel-bg: #F8F6F5;            /* Cream chart-card background */
  --cfr-gridline:       rgba(0, 0, 0, 0.12);
  --cfr-tick-label:     rgba(0, 0, 0, 0.70);
  --cfr-note:           rgba(0, 0, 0, 0.80);
  --cfr-source:         rgba(0, 0, 0, 0.70);

  /* ---------- Dark mode ---------- */
  --cfr-dark-bg:        #000000;
  --cfr-dark-panel:     #1A1A1A;
  --cfr-dark-text:      #FFFFFF;
  --cfr-dark-text-muted:rgba(255, 255, 255, 0.70);

  /* ---------- Typography ---------- */
  /* Real font names first; fallbacks after. CFR.org has Caslon Pro and
     Season Sans installed via Adobe Fonts. Standalone artifacts will fall
     through to EB Garamond / Inter / system fonts. */
  --cfr-font-serif:  "Adobe Caslon Pro", "EB Garamond", "Libre Caslon Text", Georgia, "Times New Roman", serif;
  --cfr-font-sans:   "Season Sans", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --cfr-font-mono:   "DM Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Type sizes — CFR.org graphics defaults */
  --cfr-fs-chart-title:        19px;
  --cfr-fs-chart-description:  14px;
  --cfr-fs-chart-data-label:   14px;
  --cfr-fs-chart-tick:         12px;
  --cfr-fs-chart-annotation:   14px;
  --cfr-fs-chart-note:         12px;
  --cfr-fs-chart-source:       10px;
}

/* ---------- Sensible body defaults ---------- */

body.cfr-base {
  font-family: var(--cfr-font-serif);
  color: var(--cfr-black);
  background: var(--cfr-white);
  line-height: 1.5;
}

body.cfr-base h1,
body.cfr-base h2,
body.cfr-base h3 {
  font-family: var(--cfr-font-sans);
  font-weight: 600; /* Semibold */
  color: var(--cfr-black);
}

body.cfr-base h1.cfr-headline,
body.cfr-base .cfr-headline {
  font-family: var(--cfr-font-serif);
  font-style: italic;
  font-weight: 400;
}

body.cfr-base .cfr-label {
  font-family: var(--cfr-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  background: var(--cfr-sand);
  color: var(--cfr-black);
  padding: 0.15em 0.5em;
  border-radius: 2px;
}

body.cfr-base a {
  color: var(--cfr-copper);
  text-decoration: underline;
  text-underline-offset: 2px;
}

body.cfr-base a:hover {
  color: var(--cfr-viridian);
}

/* ---------- Chart card utility ---------- */

.cfr-chart-card {
  background: var(--cfr-chart-panel-bg);
  padding: 1.5rem;
  border-radius: 8px;
  font-family: var(--cfr-font-sans);
}

.cfr-chart-card .cfr-chart-title {
  font-weight: 600;
  font-size: var(--cfr-fs-chart-title);
  margin: 0 0 0.25rem;
}

.cfr-chart-card .cfr-chart-description {
  font-weight: 500;
  font-size: var(--cfr-fs-chart-description);
  color: var(--cfr-black);
  margin: 0 0 1rem;
}

.cfr-chart-card .cfr-chart-source {
  font-weight: 500;
  font-size: var(--cfr-fs-chart-source);
  color: var(--cfr-source);
  margin-top: 1rem;
}

.cfr-chart-card .cfr-chart-note {
  font-weight: 500;
  font-size: var(--cfr-fs-chart-note);
  color: var(--cfr-note);
  margin-top: 0.5rem;
}