.viz-root {
  --surface-1:      #fcfcfb;
  --page-plane:     #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:       #e1e0d9;
  --border:         rgba(11,11,11,0.10);

  --series-ibnarabi:  #2a78d6; /* blue */
  --series-theme:     #eda100; /* yellow / gold */
  --series-daphne:    #e87ba4; /* magenta */
  --series-ibnarabi-line: #9ec5f4;
  --series-daphne-line:   #f3c3d7;
}

@media (prefers-color-scheme: dark) {
  .viz-root {
    --surface-1:      #1a1a19;
    --page-plane:     #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #898781;
    --gridline:       #2c2c2a;
    --border:         rgba(255,255,255,0.10);

    --series-ibnarabi:  #3987e5;
    --series-theme:     #c98500;
    --series-daphne:    #d55181;
    --series-ibnarabi-line: #184f95;
    --series-daphne-line:   #6b3145;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--page-plane);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px clamp(16px, 4vw, 48px) 8px;
  gap: 16px;
  position: relative;
  z-index: 10;
  pointer-events: none;
}
.app-header__title, .app-header__controls {
  pointer-events: auto;
}
.app-header__controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.app-header__title h1 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
}

.app-header__subtitle {
  margin: 4px 0 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 60ch;
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
}
.btn-ghost:hover { background: var(--gridline); }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
}
.lang-btn + .lang-btn { border-left: 1px solid var(--border); }
.lang-btn--active {
  background: var(--text-primary);
  color: var(--surface-1);
}

.intro {
  padding: 0 clamp(16px, 4vw, 48px) 8px;
  max-width: 80ch;
}
.intro p { color: var(--text-secondary); line-height: 1.5; }

.graph-wrap {
  position: relative;
  width: 100%;
  height: min(72vh, 720px);
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 0 clamp(16px, 4vw, 48px);
  width: calc(100% - clamp(32px, 8vw, 96px));
  overflow: hidden;
}

#graph {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}
#graph:active { cursor: grabbing; }

.legend {
  position: absolute;
  bottom: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: color-mix(in srgb, var(--surface-1) 85%, transparent);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.legend__item { display: flex; align-items: center; gap: 8px; }
.legend__dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.legend__dot--ibnarabi { background: var(--series-ibnarabi); }
.legend__dot--theme    { background: var(--series-theme); }
.legend__dot--daphne   { background: var(--series-daphne); }
.legend__dot--descent  { background: var(--series-ibnarabi-line); }
.legend__dot--return   { background: var(--series-theme); }
.legend__dot--paradox  { background: var(--series-daphne); }

.node-label {
  font-size: 11px;
  fill: var(--text-secondary);
  pointer-events: none;
  paint-order: stroke;
  stroke: var(--surface-1);
  stroke-width: 4px;
  stroke-linejoin: round;
}
.node-label--hub {
  font-size: 15px;
  font-weight: 600;
  fill: var(--text-primary);
  stroke-width: 5px;
}

.link {
  stroke: var(--gridline);
  stroke-width: 1.5px;
  fill: none;
}
.link--highlight {
  stroke-opacity: 0.9;
  stroke-width: 2.5px;
}
.link--descent, .link--gather {
  stroke: var(--series-ibnarabi-line);
}
.link--return {
  stroke: var(--series-theme);
  stroke-dasharray: 2 4;
}
.link--paradox {
  stroke: var(--series-daphne);
  stroke-dasharray: 1 5;
  stroke-width: 2px;
}

.ontology-node circle {
  stroke: var(--surface-1);
  stroke-width: 2px;
}
.ontology-node text.node-label {
  font-size: 12px;
}

.arrowhead--descent { fill: var(--series-ibnarabi-line); }
.arrowhead--return   { fill: var(--series-theme); }
.arrowhead--paradox  { fill: var(--series-daphne); }

.detail-block--edge {
  border-left: 4px solid var(--gridline);
}

.detail-block--sir {
  border: 1px dashed var(--border);
  border-left: 4px dashed var(--series-theme);
}
.detail-block--sir h3 {
  color: var(--series-theme);
}
.detail-block--edge h3 em {
  color: var(--text-primary);
  font-style: normal;
  font-weight: 600;
}

.node circle {
  stroke: var(--surface-1);
  stroke-width: 2px;
}
.node { cursor: pointer; }
.node:hover circle { stroke: var(--text-primary); }

.detail-panel {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(420px, 92vw);
  background: var(--surface-1);
  border-left: 1px solid var(--border);
  box-shadow: -8px 0 24px rgba(0,0,0,0.15);
  padding: 24px;
  overflow-y: auto;
  z-index: 40;
}
.detail-panel[hidden] { display: none; }

.detail-panel__close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--text-secondary);
  cursor: pointer;
}

.detail-title {
  margin: 0 0 4px;
  font-size: 1.2rem;
}
.detail-eyebrow {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 12px;
}

.detail-block {
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 14px;
  border: 1px solid var(--border);
}
.detail-block--ibnarabi { border-left: 4px solid var(--series-ibnarabi); }
.detail-block--daphne   { border-left: 4px solid var(--series-daphne); }
.detail-block h3 {
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.detail-block p { margin: 0; line-height: 1.55; font-size: 0.92rem; }

.insight {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.insight summary {
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--series-theme);
  list-style: none;
}
.insight summary::-webkit-details-marker { display: none; }
.insight summary::before {
  content: "+ ";
}
.insight[open] summary::before {
  content: "– ";
}
.insight p {
  margin: 8px 0 0;
  line-height: 1.55;
  font-size: 0.9rem;
}
.detail-block blockquote {
  margin: 0;
  font-style: italic;
  line-height: 1.55;
  font-size: 0.92rem;
  color: var(--text-primary);
}
.detail-block cite {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: normal;
}
.detail-block cite a { color: inherit; }

.detail-resonance {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  padding-top: 4px;
}

.app-footer {
  padding: 16px clamp(16px, 4vw, 48px) 32px;
  color: var(--text-muted);
  font-size: 0.78rem;
  max-width: 80ch;
}
.app-footer p + p { margin-top: 6px; }
.app-footer a { color: inherit; }

@media (max-width: 640px) {
  .app-header { flex-direction: column; }
  .detail-panel { width: 100vw; }
}