/* ════════════════════════════════════════════════════════════
   Third Rock Wealth · CHARTS REFRESH
   Shared chart shell + tooltip + axis vocabulary used by
   js/charts.js (performanceLine, drawdownChart, rollingHistogram,
   sparkline) AND js/calculators.js (renderGrowthChart, renderCompareChart,
   renderDispersionBand). Linked on every page that renders charts.
   ════════════════════════════════════════════════════════════ */

/* ── SHARED SHELL ────────────────────────────────────── */
.chart-wrap {
  position: relative;
  background: var(--paper-card);
  border: 1px solid var(--rule-strong);
  padding: clamp(20px, 2.5vw, 28px) clamp(18px, 2vw, 24px) 14px;
}
.chart-wrap.bare {
  background: transparent;
  border: none;
  padding: 0;
}

.chart-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
}
.chart-head h3, .chart-head h4 {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink);
  margin: 0;
}
.chart-head .chart-meta {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--neutral-grey);
}

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

.chart-foot {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* ── LEGEND ──────────────────────────────────────────── */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}
.chart-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.chart-legend-swatch {
  display: inline-block;
  width: 14px;
  height: 8px;
  border-radius: 1px;
}
.chart-legend-swatch.line {
  height: 2px;
  border-radius: 2px;
}
.chart-legend-swatch.dashed {
  height: 0;
  border-top: 1.5px dashed currentColor;
  background: transparent;
}
/* swatch colour helpers — used per chart by setting bg explicitly */
.chart-legend-swatch.invested  { background: var(--rule-strong); }
.chart-legend-swatch.returns   { background: var(--signal); }
.chart-legend-swatch.fund      { background: var(--ink); }
.chart-legend-swatch.benchmark { background: var(--oxford-light); }
.chart-legend-swatch.band      { background: var(--signal-soft); border: 1px dashed var(--signal-deep); }
.chart-legend-swatch.warning   { background: var(--warning); }

/* ── AXES & GRID ─────────────────────────────────────── */
.chart-axis-label {
  font-family: var(--mono);
  font-size: 9px;
  fill: var(--neutral-grey);
  letter-spacing: 0.04em;
}
.chart-axis-tick {
  stroke: var(--rule-strong);
  stroke-width: 0.6;
}
.chart-grid-line {
  stroke: var(--rule);
  stroke-width: 0.6;
  stroke-dasharray: 2 3;
}
.chart-grid-line.major {
  stroke-dasharray: none;
  stroke: var(--rule-strong);
}
.chart-zero-line {
  stroke: var(--ink-soft);
  stroke-width: 0.8;
  opacity: 0.5;
}

/* ── DATA STROKES ────────────────────────────────────── */
.chart-series-fund {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.chart-series-benchmark {
  fill: none;
  stroke: var(--oxford-light);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 4 4;
}
.chart-series-median {
  fill: none;
  stroke: var(--signal-deep);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.chart-series-bound {
  fill: none;
  stroke: var(--signal-deep);
  stroke-width: 1;
  stroke-dasharray: 3 4;
  opacity: 0.55;
  stroke-linecap: round;
}
.chart-series-invested {
  fill: none;
  stroke: var(--neutral-grey);
  stroke-width: 1.4;
  stroke-dasharray: 4 3;
  stroke-linecap: round;
}

.chart-dot {
  fill: var(--ink);
  stroke: var(--paper-card);
  stroke-width: 2;
}
.chart-dot.signal { fill: var(--signal-deep); }
.chart-dot.warning { fill: var(--warning); }

/* ── TOOLTIP ─────────────────────────────────────────── */
.chart-tooltip {
  position: absolute;
  pointer-events: none;
  z-index: 4;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transform: translate(-50%, -100%);
  margin-top: -8px;
  opacity: 0;
  transition: opacity 120ms ease;
  box-shadow: 0 4px 18px rgba(40, 62, 45, 0.2);
}
.chart-tooltip.visible { opacity: 1; }
.chart-tooltip::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -6px;
  margin-left: -6px;
  border-style: solid;
  border-width: 6px 6px 0 6px;
  border-color: var(--ink) transparent transparent transparent;
}
.chart-tooltip .ttip-label {
  display: block;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: rgba(255, 252, 249, 0.55);
  margin-bottom: 2px;
}
.chart-tooltip .ttip-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-feature-settings: "tnum";
}
.chart-tooltip .ttip-row strong {
  font-weight: 600;
  color: var(--paper);
}
.chart-tooltip .ttip-row span {
  color: rgba(255, 252, 249, 0.7);
}

/* Hover cursor line + marker */
.chart-hover-line {
  stroke: var(--ink);
  stroke-width: 1;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}
.chart-hover-line.visible { opacity: 0.4; }
.chart-hover-dot {
  fill: var(--ink);
  stroke: var(--paper-card);
  stroke-width: 2;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}
.chart-hover-dot.visible { opacity: 1; }

/* ── AREA FILLS ──────────────────────────────────────── */
.chart-area-invested {
  fill: url(#grad-invested);
}
.chart-area-returns {
  fill: url(#grad-returns);
}
.chart-area-band {
  fill: url(#grad-band);
  opacity: 0.85;
}
.chart-area-fund {
  fill: url(#grad-fund);
}
.chart-area-warning {
  fill: url(#grad-warning);
}

/* ── DRAWDOWN-SPECIFIC ──────────────────────────────── */
.chart-drawdown-area {
  fill: var(--warning);
  opacity: 0.18;
}
.chart-drawdown-recovery {
  fill: var(--signal);
  opacity: 0.1;
}
.chart-drawdown-trough {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  fill: var(--warning);
  letter-spacing: 0.04em;
}
.chart-drawdown-callout {
  font-family: var(--mono);
  font-size: 9px;
  fill: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* ── HISTOGRAM ──────────────────────────────────────── */
.chart-bar {
  fill: var(--signal);
  transition: fill 120ms ease;
}
.chart-bar:hover { fill: var(--signal-deep); }
.chart-bar.negative { fill: var(--warning); }

/* ── ENDCAP DOT LABEL ────────────────────────────────── */
.chart-endcap {
  pointer-events: none;
}
.chart-endcap-rect {
  fill: var(--ink);
}
.chart-endcap-text {
  fill: var(--paper);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  font-feature-settings: "tnum";
}

/* ── RESPONSIVE ─────────────────────────────────────── */
@media (max-width: 600px) {
  .chart-head { flex-direction: column; align-items: flex-start; gap: 6px; }
  .chart-legend { gap: 10px; }
  .chart-tooltip { font-size: 10px; padding: 6px 9px; }
}