/* ============================================================
   styles/page-knowledge-map.css
   Knowledge Map page — graph canvas, toolbar, legend, tooltip
   ============================================================ */

/* ── page hero ─────────────────────────────────────────────── */
.page-hero .km-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 14px;
  font-size: 0.82rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* ── toolbar: legend + path selector ────────────────────────── */
.km-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  padding: 14px 0 16px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.km-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
}

.km-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--fg-soft);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.km-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 2px solid transparent;
}

/* path selector */
.km-path-wrap {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.km-path-label {
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.km-path-select {
  font-size: 0.82rem;
  font-family: var(--font-body);
  color: var(--fg);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  outline: none;
  min-width: 200px;
}

.km-path-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-wash);
}

.km-path-clear {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  padding: 5px 9px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.km-path-clear:hover {
  color: var(--fg-soft);
  border-color: var(--fg-soft);
}

/* ── graph canvas ────────────────────────────────────────────── */
.km-canvas-wrap {
  position: relative;
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--surface);
}

#km-graph {
  width: 100%;
  height: clamp(440px, 60vh, 680px);
  display: block;
}

/* ── path strip (below graph) ────────────────────────────────── */
.km-path-strip {
  display: none;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-top: 20px;
}

.km-path-strip.visible {
  display: flex;
}

.km-path-header {
  padding: 14px 18px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}

.km-path-header h3 {
  margin: 0 0 2px;
  font-size: 1rem;
  color: var(--fg);
}

.km-path-header p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.km-path-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.km-path-step {
  counter-increment: step;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--faint);
  transition: background 0.12s;
}

.km-path-step:last-child {
  border-bottom: none;
}

.km-path-step:hover {
  background: var(--bg-2);
}

.km-step-num {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 700;
  margin-top: 1px;
}

.km-step-body {
  flex: 1;
  min-width: 0;
}

.km-step-body a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-ink);
  text-decoration: none;
  display: block;
  margin-bottom: 2px;
}

.km-step-body a:hover {
  text-decoration: underline;
}

.km-step-body p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}

/* ── hover tooltip ───────────────────────────────────────────── */
#km-tooltip {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  max-width: 260px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 13px;
  box-shadow: var(--shadow);
  transition: opacity 0.1s;
}

#km-tooltip[hidden] {
  display: none;
}

.km-tt-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg);
  margin: 0 0 3px;
  line-height: 1.3;
}

.km-tt-group {
  font-size: 0.73rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 6px;
}

.km-tt-why {
  font-size: 0.78rem;
  color: var(--fg-soft);
  margin: 0;
  line-height: 1.4;
}

.km-tt-hint {
  font-size: 0.72rem;
  color: var(--muted);
  margin: 5px 0 0;
  font-style: italic;
}

/* ── mobile fallback ─────────────────────────────────────────── */
.km-mobile-notice {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
  padding: 40px 20px;
  border: 1px dashed var(--border);
  border-radius: 10px;
  color: var(--muted);
}

.km-mobile-notice p {
  margin: 0;
  font-size: 0.9rem;
  max-width: 34ch;
}

.km-mobile-notice .km-mobile-icon {
  font-size: 2rem;
  opacity: 0.4;
}

@media (max-width: 700px) {
  .km-toolbar { display: none; }
  #km-graph   { display: none; }
  .km-mobile-notice { display: flex; }
  .km-path-strip    { display: none !important; }
}

/* ── SVG node interaction ───────────────────────────────────────── */
.km-node {
  cursor: pointer;
}

.km-node circle {
  transition: opacity 0.2s;
}

.km-abbr, .km-short-label {
  user-select: none;
  -webkit-user-select: none;
  transition: opacity 0.2s;
}

/* ── loading state ───────────────────────────────────────────── */
.km-canvas-wrap[aria-busy="true"]::after {
  content: "Loading graph…";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--font-mono);
  background: var(--surface);
}