/* ===================================================
   graph-scroll.css
   — Background canvas
   — Hero lead styled spans
   — Scroll reveal animation
   — Node sections (circular graph nodes + spine)
   — Annotated datasheet demo
   =================================================== */

/* ── Background canvas ───────────────────────────── */
#bgCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.08;
}

/* ── Hero lead ───────────────────────────────────── */
.hero-lead__arrow {
  color: var(--beige);
  font-weight: 700;
  margin: 0 0.1em;
}
.hero-lead__accent {
  color: var(--beige);
  font-weight: 600;
}

/* ── Scroll reveal ───────────────────────────────── */
.graph-node-reveal {
  opacity: 0;
  transform: scale(0.85) translateY(10px);
  transition:
    opacity  0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.graph-node-reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ── Sections track + spine ──────────────────────── */
.sections-track {
  position: relative;
}

/* Spine SVG injected by scroll-graph.js */
.sections-track .spine-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: visible;
}

/* ── Node sections ───────────────────────────────── */
.node-section {
  position: relative;
  z-index: 2;
  padding-top: clamp(3rem, 7vw, 5rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

/* Full-width anchor that positions the ring */
.node-anchor {
  position: relative;
  width: 100%;
  display: flex;
  padding: 0 1.5rem;
  margin-bottom: 2.5rem;
  pointer-events: none;   /* don't block content below */
}

/* The circular graph node */
.node-ring {
  position: relative;
  width: 220px;
  min-width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 1px solid rgba(212, 196, 176, 0.28);
  background:
    radial-gradient(circle at 38% 38%, rgba(212,196,176,0.09) 0%, transparent 65%),
    var(--black-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.25rem;
  pointer-events: auto;
  box-shadow: 0 0 40px rgba(212, 196, 176, 0.06);
  /* Position driven by CSS custom property --nx (0–1 fraction of parent width) */
  margin-left: clamp(0px, calc(var(--nx, 0.5) * 100% - 110px), calc(100% - 220px));
  /* Reveal: scale up from small */
  transform-origin: center center;
}

/* Active glow on visible node */
.node-ring.is-visible {
  box-shadow: 0 0 60px rgba(212, 196, 176, 0.12), 0 0 0 1px rgba(212,196,176,0.18);
}

.node-ring .eyebrow {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--beige-deep);
  margin: 0 0 0.5rem;
}

.node-ring h2 {
  font-size: 1.05rem;
  font-weight: 200;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 0;
  color: var(--white);
}

/* Node content — regular section content below the ring */
.node-content {
  position: relative;
  z-index: 2;
}

.node-content .section-desc {
  max-width: 38rem;
  margin: 0 0 1.75rem;
  color: var(--grey-light);
  font-size: 1rem;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 768px) {
  .node-ring {
    width: 180px;
    min-width: 180px;
    height: 180px;
    margin-left: clamp(0px, calc(var(--nx, 0.5) * 100% - 90px), calc(100% - 180px));
  }
  .node-ring h2 {
    font-size: 0.9rem;
  }
}

/* ── Annotated datasheet ─────────────────────────── */
.anno-stage {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
  align-items: start;
  margin-top: 0.5rem;
}

@media (max-width: 900px) {
  .anno-stage {
    grid-template-columns: 1fr;
  }
}

/* The mock document */
.anno-doc {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--black-soft);
  padding: 1.25rem 1.5rem;
  position: relative;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.72rem;
  line-height: 1.5;
}

.anno-doc__head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding-bottom: 0.65rem;
  margin-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.anno-doc__partnum {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--beige);
  letter-spacing: 0.04em;
}

.anno-doc__doctitle {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--white);
  font-family: 'Inter', sans-serif;
  letter-spacing: 0;
}

.anno-doc__rev {
  font-size: 0.6rem;
  color: var(--grey);
  margin-left: auto;
  letter-spacing: 0.06em;
  font-weight: 600;
  text-transform: uppercase;
}

.anno-doc__sect-label {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--beige-deep);
  margin-bottom: 0.3rem;
}

.anno-doc__cond {
  font-size: 0.6rem;
  color: var(--grey);
  margin: 0 0 0.65rem;
  font-family: 'Inter', sans-serif;
}

.anno-doc__table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.25rem;
}

.anno-doc__table th {
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey);
  padding: 0.3rem 0.5rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  background: var(--black);
}

.anno-doc__table td {
  padding: 0.32rem 0.5rem;
  color: var(--grey-light);
  border-bottom: 1px solid rgba(42,42,42,0.5);
}

.anno-doc__table td:first-child {
  color: var(--beige-deep);
  font-weight: 600;
}

/* Highlighted table row */
.anno-row-hi {
  background: rgba(212, 196, 176, 0.06);
}

.anno-row-hi td {
  color: var(--white) !important;
}

.anno-row-hi td:first-child {
  color: var(--beige) !important;
}

.anno-marker-cell {
  padding: 0 0.25rem;
  width: 24px;
  text-align: center;
}

/* Figure area */
.anno-fig {
  position: relative;
  margin-top: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--black);
  padding: 0.5rem;
}

.anno-chart-svg {
  display: block;
  width: 100%;
}

.anno-num--float {
  position: absolute;
  top: 0.35rem;
  right: 0.4rem;
}

/* Footnote */
.anno-doc__rule {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 0.85rem 0 0.5rem;
}

.anno-footnote-line {
  font-size: 0.6rem;
  color: var(--grey);
  margin: 0;
  display: flex;
  gap: 0.4rem;
  align-items: flex-start;
  line-height: 1.55;
  font-family: 'Inter', sans-serif;
}

.anno-footnote-line sup {
  color: var(--beige-deep);
}

/* Annotation number markers ①②③ */
.anno-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid rgba(212, 196, 176, 0.5);
  background: rgba(212, 196, 176, 0.1);
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--beige);
  flex-shrink: 0;
  font-family: 'Inter', sans-serif;
  line-height: 1;
}

.anno-num--fn {
  margin-right: 0.3rem;
}

/* Callout panel */
.anno-callouts {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.anno-callout {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--elevated);
  padding: 0.9rem 1rem;
  transition: border-color 0.2s;
}

.anno-callout:hover {
  border-color: rgba(212, 196, 176, 0.25);
}

.anno-callout__hd {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.anno-callout__tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey);
  font-family: 'Inter', sans-serif;
}

.anno-callout__query {
  display: block;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.65rem;
  color: var(--beige-deep);
  background: var(--black);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.35rem 0.55rem;
  margin-bottom: 0.5rem;
  word-break: break-all;
  line-height: 1.4;
}

.anno-callout__resp {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.6rem;
  color: var(--grey-light);
  background: var(--black);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.45rem 0.6rem;
  margin: 0;
  line-height: 1.55;
  overflow-x: auto;
}

/* Annotation number color variants */
.anno-num--a { border-color: rgba(212,196,176,0.6); color: var(--beige); }
.anno-num--b { border-color: rgba(120,200,180,0.5); color: rgba(120,200,180,0.9); background: rgba(120,200,180,0.08); }
.anno-num--c { border-color: rgba(180,140,220,0.5); color: rgba(180,140,220,0.9); background: rgba(180,140,220,0.08); }

/* ── Reduced motion ──────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .graph-node-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  #bgCanvas { display: none; }
}