/*
 * polygraph-viz — design tokens + layout.
 *
 * The palette is driven by CSS custom properties on :root, with [data-theme]
 * overrides that swap the entire palette atomically. The renderers reference
 * --edge, --ink, --bg, etc. directly via SVG attributes like
 * fill="var(--ink)", so a theme flip cascades into the graph without
 * re-rendering anything.
 *
 * Tokens deliberately match the proposal doc (2026-05-20-06-55-polygraph-viz-d3-plan.md).
 */

:root,
:root[data-theme='dark'] {
  --bg: #0e1019;
  --panel: #1a1d2e;
  --panel-2: #232842;
  --ink: #e6e8f2;
  --muted: #8a8fa3;
  /* --edge needs to read clearly against --bg even at reduced opacity.
     Old #3a3f55 was 3.9:1 -> 2.7:1 effective after 0.7 alpha (below
     WCAG 4.5:1). #7e88a8 is 8.4:1, ~5.9:1 effective. */
  --edge: #7e88a8;
  --border: #2a2e44;
  --accent: #7aa2ff;
  --accent-ink: #0e1019;
  --error: #ff6b81;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

:root[data-theme='light'] {
  --bg: #fafafa;
  --panel: #ffffff;
  --panel-2: #f0f2f7;
  --ink: #1a1d2e;
  --muted: #5a5f73;
  /* Light-mode edge slightly darkened from #cdd1de so node-to-node
     lines stay legible at 0.7 opacity. */
  --edge: #9aa1b4;
  --border: #e2e5ee;
  --accent: #3b6dd6;
  --accent-ink: #ffffff;
  --error: #cc2244;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body,
#app {
  height: 100%;
}

body {
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    'Inter',
    'Segoe UI',
    sans-serif;
  font-size: 13px;
  background: var(--bg);
  color: var(--ink);
  transition:
    background-color 120ms ease,
    color 120ms ease;
}

#app {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
}

/* ── Toolbar ────────────────────────────────────────────────── */

#toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

#toolbar h1 {
  font-size: 14px;
  font-weight: 600;
  margin-right: 12px;
  color: var(--ink);
}

#view-tabs {
  display: flex;
  gap: 4px;
}

#view-tabs button,
#theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 4px 10px;
  font: inherit;
  cursor: pointer;
  border-radius: 4px;
  transition:
    background-color 80ms ease,
    border-color 80ms ease;
}

#view-tabs button:hover,
#theme-toggle:hover {
  background: var(--panel-2);
}

#view-tabs button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

#search {
  flex: 1;
  max-width: 320px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 4px 10px;
  border-radius: 4px;
  font: inherit;
}

#search::placeholder {
  color: var(--muted);
}

/* ── Main ───────────────────────────────────────────────────── */

main {
  display: grid;
  grid-template-columns: 1fr 320px;
  min-height: 0;
}

#viz {
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

#viz svg {
  display: block;
  width: 100%;
  height: 100%;
}

.placeholder {
  padding: 24px;
  color: var(--muted);
}

.placeholder.error {
  color: var(--error);
}

/* ── Inspector ──────────────────────────────────────────────── */

#inspector {
  border-left: 1px solid var(--border);
  padding: 14px;
  overflow: auto;
  background: var(--panel);
}

#inspector[hidden] {
  display: none;
}

#inspector header h2 {
  font-size: 14px;
  margin-bottom: 4px;
  color: var(--ink);
  word-break: break-word;
}

#inspector .labels {
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 12px;
}

#inspector table.props {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

#inspector table.props th {
  text-align: left;
  color: var(--muted);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  padding: 4px 6px;
}

#inspector table.props td {
  padding: 4px 6px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  word-break: break-word;
}

#inspector table.props td:first-child {
  color: var(--muted);
  white-space: nowrap;
}

/* ── Footer stats ───────────────────────────────────────────── */

#stats {
  padding: 6px 14px;
  font-size: 11px;
  color: var(--muted);
  background: var(--panel);
  border-top: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}

/* ── Force-directed view ────────────────────────────────────── */

.force-layer .nodes .node text {
  user-select: none;
}

/* ── Inspector — group-members list ──────────────────────── */

#inspector ul.group-members {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 12px;
}

#inspector ul.group-members li {
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
  word-break: break-word;
}

#inspector ul.group-members li code {
  color: var(--muted);
  font-size: 11px;
  margin-right: 6px;
}

#inspector ul.group-members li.muted {
  color: var(--muted);
  font-style: italic;
  text-align: center;
}

/* ── SVG theming via class selectors ─────────────────────────
   SVG presentation attributes set as .attr('stroke', 'var(--x)') don't
   reliably resolve CSS variables; we set the SVG classes here in CSS
   so theme toggles propagate atomically. */

/* Force view */
.force-svg .edge {
  stroke: var(--edge);
  /* 0.9 instead of 0.7: edges should compete with node fills for
     visibility. The palette is muted enough that this doesn't crowd. */
  stroke-opacity: 0.9;
}

.force-svg .node-circle {
  stroke: var(--ink);
}

.force-svg .node-label {
  fill: var(--ink);
}

/* Chord view */
.chord-svg .chord-arc {
  stroke: var(--bg);
}

.chord-svg .chord-ribbon {
  stroke: var(--bg);
}

.chord-svg .chord-label {
  fill: var(--ink);
}

/* Sankey view */
.sankey-svg .sankey-link {
  /* stroke color is set per-link from the label palette;
     no CSS variable override needed here. */
}

.sankey-svg .sankey-node {
  stroke: var(--bg);
}

.sankey-svg .sankey-node-label {
  fill: var(--ink);
}

.sankey-svg .sankey-header {
  fill: var(--muted);
}

/* ── Inspector — edge view + aggregate ───────────────────── */

#inspector header h2.edge-title {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  color: var(--accent);
}

#inspector .edge-endpoints {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 2px;
}

#inspector .edge-endpoints code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 3px;
}

#inspector .edge-endpoints .arrow {
  color: var(--ink);
}

#inspector .edge-endpoints-friendly {
  font-size: 12px;
  color: var(--ink);
  margin-bottom: 12px;
}

#inspector h3.sample-header {
  margin-top: 14px;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Sankey multi-chain layout ─────────────────────────────── */

.sankey-wrapper {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  overflow: auto;
}

.sankey-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  color: var(--muted);
  flex: 0 0 auto;
}

.sankey-status {
  font-variant-numeric: tabular-nums;
}

.sankey-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 3px 10px;
  font: inherit;
  font-size: 11px;
  cursor: pointer;
  border-radius: 4px;
  transition: background-color 80ms ease, border-color 80ms ease;
}

.sankey-toggle:hover {
  background: var(--panel-2);
  border-color: var(--accent);
}

.sankey-chain {
  flex: 0 0 auto;
  min-height: 180px;
  position: relative;
  border-bottom: 1px solid var(--border);
}

.sankey-chain:last-child {
  border-bottom: none;
}

.sankey-chain svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Force-view legend (HTML overlay) ───────────────────────── */

.force-legend {
  position: absolute;
  top: 12px;
  right: 12px;
  max-width: 240px;
  max-height: calc(100% - 24px);
  overflow-y: auto;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px;
  font-size: 11px;
  z-index: 5;
  backdrop-filter: blur(4px);
  box-shadow: var(--shadow);
}

.force-legend .legend-row {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 4px 6px;
  background: transparent;
  border: none;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  transition: background-color 60ms ease;
}

.force-legend .legend-row:hover {
  background: var(--panel-2);
}

.force-legend .legend-swatch {
  flex: 0 0 12px;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.force-legend .legend-label {
  flex: 1 1 auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  word-break: break-word;
}

.force-legend .legend-count {
  flex: 0 0 auto;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 10px;
}