/* ============================================================
   THE NEURAL STACK (#neural) — concentric rings + flow cards.
   Left: three rings, one per model — every industry (neural2)
   → your brand (neural3) → each customer (neural4) — drawing
   in sequence on reveal. Right: one card per model with its
   time-to-value tag, connected by a downward flow.
   Interactive: hovering/clicking/focusing a ring or its card
   highlights the pair; an idle auto-cycle walks the three
   (js/neural.js). Hues are the homepage accents; identity is
   always carried by the direct labels, never colour alone.
   ============================================================ */

#neural { --n2: var(--yellow); --n3: var(--coral); --n4: var(--pink); }

.nring {
  display: grid;
  grid-template-columns: minmax(250px, 300px) 1fr;
  gap: 40px;
  align-items: center;
  margin-top: 28px;
}

/* ---- rings figure ------------------------------------------- */
.nring-fig { position: relative; }
.nring-fig svg { display: block; width: 100%; height: auto; }

.rg { transition: opacity 0.3s var(--ease); }
.rg circle { transition: stroke-width 0.3s var(--ease); }
.rg text {
  font-family: var(--f-label);
  font-size: 15px;
  fill: #240016;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

/* draw-in: rings sweep clockwise from 12 o'clock, core scales up */
/* dash length is deliberately >1 (pathLength=1) so the stroke's start and
   end overlap — a dasharray of exactly 1 leaves a hairline seam at the
   12 o'clock join once the ring has finished drawing */
.rg-n2 circle, .rg-n3 circle {
  fill: none;
  stroke-dasharray: 1.04;
  stroke-dashoffset: 1.04;
}
.rg-n2 circle { stroke: var(--n2); stroke-width: 44; transition: stroke-dashoffset 0.9s var(--ease) 0.1s, stroke-width 0.3s var(--ease); }
.rg-n3 circle { stroke: var(--n3); stroke-width: 40; transition: stroke-dashoffset 0.9s var(--ease) 0.55s, stroke-width 0.3s var(--ease); }
.rg-n4 circle {
  fill: var(--n4);
  transform: scale(0);
  transform-box: fill-box;
  transform-origin: center;
  transition: transform 0.55s var(--ease) 1.05s;
}
.nring.in .rg-n2 circle, .nring.in .rg-n3 circle { stroke-dashoffset: 0; }
.nring.in .rg-n4 circle { transform: scale(1); }
.nring.in .rg-n2 text { opacity: 1; transition-delay: 0.75s; }
.nring.in .rg-n3 text { opacity: 1; transition-delay: 1.2s; }
.nring.in .rg-n4 text { opacity: 1; transition-delay: 1.45s; }

/* breathing wave, once revealed and settled: every ring pulses on a
   shared rhythm, phase-staggered outer → middle → core so the pulse
   rolls inward like a wave. */
@keyframes nring-breathe {
  0%, 100% { transform: scale(1); }
  35% { transform: scale(var(--amp, 1.05)); }
}
.nring.in.settled .rg circle {
  animation: nring-breathe 3.6s ease-in-out infinite;
  transform-box: fill-box;
  transform-origin: center;
  transition: stroke-width 0.3s var(--ease);
}
.rg-n2 circle { --amp: 1.04; }
.rg-n3 circle { --amp: 1.06; }
.rg-n4 circle { --amp: 1.1; }
.nring.in.settled .rg-n2 circle { animation-delay: 0s; }
.nring.in.settled .rg-n3 circle { animation-delay: 0.45s; }
.nring.in.settled .rg-n4 circle { animation-delay: 0.9s; }

/* highlight states (data-hl set by js/neural.js) */
.nring[data-hl] .rg { cursor: pointer; }
.nring[data-hl="n2"] .rg:not(.rg-n2),
.nring[data-hl="n3"] .rg:not(.rg-n3),
.nring[data-hl="n4"] .rg:not(.rg-n4) { opacity: 0.45; }
.nring[data-hl="n2"] .rg-n2 circle { stroke-width: 50; }
.nring[data-hl="n3"] .rg-n3 circle { stroke-width: 46; }

/* ---- flow cards --------------------------------------------- */
.nring-cards { display: flex; flex-direction: column; }
.nrc-arrow {
  align-self: center;
  height: 16px;
  display: flex;
  align-items: center;
  color: var(--cream-3);
  opacity: 0;
  transition: opacity 0.4s var(--ease) 1.3s;
}
.nring.in .nrc-arrow { opacity: 1; }
.nrc-arrow svg { width: 13px; height: 13px; }

.ncard {
  position: relative;
  background: var(--page-panel);
  border: 1px solid var(--hair);
  padding: 13px 18px 14px;
  overflow: hidden;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.ncard::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; }
.ncard.n2::before { background: var(--n2); }
.ncard.n3::before { background: var(--n3); }
.ncard.n4::before { background: var(--n4); }
.ncard:focus-visible { outline: 2px solid var(--pink); outline-offset: 2px; }
.ncard .nc-top {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.ncard .nc-when {
  font-family: var(--f-label);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cream-4);
  white-space: nowrap;
}
.ncard .nc-chip {
  font-family: var(--f-label);
  font-size: 13px;
  color: var(--cream);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.nk-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.nk-dot.n2 { background: var(--n2); }
.nk-dot.n3 { background: var(--n3); }
.nk-dot.n4 { background: var(--n4); }
.ncard h3 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.02em;
  color: var(--cream);
  margin: 8px 0 5px;
}
.ncard .nc-body { margin: 0; font-size: 13.5px; line-height: 1.5; color: var(--cream-2); }

/* card side of the highlight pairing */
.nring[data-hl="n2"] .ncard:not(.n2),
.nring[data-hl="n3"] .ncard:not(.n3),
.nring[data-hl="n4"] .ncard:not(.n4) { opacity: 0.55; }
.nring[data-hl="n2"] .ncard.n2,
.nring[data-hl="n3"] .ncard.n3,
.nring[data-hl="n4"] .ncard.n4 { border-color: var(--hair-2); transform: translateY(-3px); }

/* ---- the four agents ----------------------------------------
   The models predict; the agents act. A quieter rail beneath the
   rings: hairline cards, icon + name, Jacq carries the accent and
   links down to its own section. */
.nagents { margin-top: 34px; }
.nag-lab {
  font-family: var(--f-label);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cream-3);
  text-align: center;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.nag-lab::before, .nag-lab::after { content: ""; flex: 1; height: 1px; background: var(--hair); }
.nag-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.nagent {
  background: rgba(246, 239, 224, 0.04);
  border: 1px solid var(--hair);
  border-radius: 12px;
  padding: 14px 16px 15px;
}
.nagent.jacq { border-color: rgba(255, 122, 233, 0.45); background: rgba(255, 122, 233, 0.06); }
.nag-name {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--f-sans);
  font-weight: 600;
  font-size: 13.5px;
  color: var(--cream);
}
.nag-ic { display: inline-flex; color: var(--pink); flex: none; }
.nag-ic svg { width: 15px; height: 15px; }
.nag-body { margin: 7px 0 0; font-size: 12.5px; line-height: 1.5; color: var(--cream-2); }
.nag-link { color: var(--pink); font-weight: 600; text-decoration: none; white-space: nowrap; }
.nag-link:hover { text-decoration: underline; }

/* ---- responsive --------------------------------------------- */
@media (max-width: 900px) {
  .nring { grid-template-columns: 1fr; gap: 24px; }
  .nring-fig { max-width: 250px; margin: 0 auto; }
  .nag-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .nag-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .rg-n2 circle, .rg-n3 circle { stroke-dashoffset: 0; transition: none; }
  .rg-n4 circle { transform: scale(1); transition: none; }
  .rg text { opacity: 1; transition: none; }
  .nrc-arrow { opacity: 1; transition: none; }
  .nring.in.settled .rg circle { animation: none; }
  .nring[data-hl="n2"] .ncard.n2,
  .nring[data-hl="n3"] .ncard.n3,
  .nring[data-hl="n4"] .ncard.n4 { transform: none; }
}