/* TOT Insights — shared chart & diagram styles
   Implements docs/STYLE_GUIDE.md rules 5 (charts) and 6 (diagrams).

   Link AFTER main.css on any visualisation page:
     <link rel="stylesheet" href="assets/css/main.css">
     <link rel="stylesheet" href="assets/css/viz.css">

   Charts and diagrams sit INSIDE a .reading-surface (cream). These styles
   give them the house look so no page invents its own. */

/* ─── Charts: spare, no chrome (rule 5) ─────────────────────────────── */

.chart-figure {
  background: transparent;   /* no fill behind the plot */
  border: none;              /* no chart border */
  box-shadow: none;          /* no drop shadow / 3D */
  margin: 0 0 var(--space-5);
}
.chart-figure > canvas,
.chart-figure > svg { max-width: 100%; height: auto; }

.chart-title {
  font-family: var(--font-serif);
  color: var(--navy);        /* dark navy serif — always legible */
  font-size:var(--fs-body);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

/* Plain-English gloss: spell out what the numbers mean (rule 5) */
.chart-note {
  font-family: var(--font-serif);
  color: var(--grey-700);
  font-size:var(--fs-body);
  line-height: 1.5;
  margin-top: var(--space-2);
  max-width: var(--reading-measure);
}

/* Source line — link to the research brief, never a repo file (rule 8) */
.chart-source {
  font-family: var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-top: var(--space-2);
}
.chart-source a { color: var(--gold); }

/* ─── Diagrams: plain boxes + connecting lines (rule 6) ─────────────── */

.diagram {
  display: grid;
  gap: var(--space-4);
  font-family: var(--font-serif);
  align-items: start;        /* keep the layout on a consistent grid */
}

.diagram-box {
  background: var(--cream-raised);
  border: 1px solid var(--grey-300);
  border-radius: 3px;
  padding: var(--space-3) var(--space-4);
  color: var(--navy);        /* Garamond dark navy box text */
  font-family: var(--font-serif);
  box-shadow: none;          /* no depth effects */
}
.diagram-box h3, .diagram-box h4, .diagram-box p, .diagram-box li {
  font-family: var(--font-serif);
  color: var(--navy);
}
.diagram-box .box-label {    /* small uppercase label inside a box */
  font-family: var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey-500);
}

/* Status / important nodes — colour ONLY to signal meaning (rule 4).
   Applied as a left accent + border so the box stays neutral otherwise. */
.diagram-box.is-confirmed { border-left: 4px solid var(--status-confirmed); }
.diagram-box.is-partial   { border-left: 4px solid var(--status-partial); }
.diagram-box.is-negative  { border-left: 4px solid var(--status-negative); }
.diagram-box.is-key       { border: 2px solid var(--gold); }  /* analytically important node */

/* Connectors: simple neutral lines; colour only to signal status */
.diagram-connector            { stroke: var(--grey-500); stroke-width: 1.5; fill: none; }
.diagram-connector.is-confirmed { stroke: var(--status-confirmed); }
.diagram-connector.is-partial   { stroke: var(--status-partial); }
.diagram-connector.is-negative  { stroke: var(--status-negative); }

/* ─── Status legend (shared key for meaning colours) ────────────────── */

.status-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey-700);
  margin: var(--space-3) 0;
}
.status-legend .swatch {
  display: inline-block;
  width: 12px; height: 12px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: -1px;
}
.status-legend .swatch.confirmed { background: var(--status-confirmed); }
.status-legend .swatch.partial   { background: var(--status-partial); }
.status-legend .swatch.negative  { background: var(--status-negative); }

/* ─── Accessibility: interaction works on tap + keyboard (rule 7) ───── */

.diagram-box[tabindex], .diagram-box a,
.chart-figure [role="button"], .chart-figure a {
  min-height: 44px;          /* tap target big enough for a phone */
}
.diagram-box:focus-visible, .chart-figure :focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ─── Diagram enlarge / lightbox (shared, wired by diagram-zoom.js) ─── */
.diagram-zoomable { position: relative; }
.diagram-enlarge {
  position: absolute; top: .55rem; right: .55rem; z-index: 5;
  display: inline-flex; align-items: center; gap: .3rem;
  font-family: var(--font-mono); font-size: var(--fs-label);
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--navy); background: rgba(255,255,255,.9);
  border: 1px solid var(--border); border-radius: 4px;
  padding: .28rem .5rem; cursor: pointer;
  transition: background .12s, color .12s;
}
.diagram-enlarge:hover, .diagram-enlarge:focus-visible { background: var(--navy); color: #fff; }
.diagram-lightbox {
  position: fixed; inset: 0; z-index: 9998;
  display: none; align-items: center; justify-content: center;
  background: rgba(10,22,40,.82); padding: 2.5rem;
}
.diagram-lightbox.open { display: flex; }
.diagram-lightbox-inner {
  background: var(--cream); border-radius: 8px; padding: 1.5rem 1.5rem 1rem;
  max-width: 96vw; max-height: 92vh; overflow: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.diagram-lightbox-inner svg {
  height: auto; max-width: none; display: block;   /* width set by diagram-zoom.js */
}
.diagram-lightbox-hint {
  font-family: var(--font-mono); font-size: var(--fs-label);
  color: var(--muted); text-align: center; margin-top: .75rem;
  text-transform: uppercase; letter-spacing: .08em;
}
.diagram-lightbox-close {
  position: fixed; top: .75rem; right: 1.1rem; z-index: 9999;
  background: none; border: none; color: #fff;
  font-size: 2.2rem; line-height: 1; cursor: pointer;
}