.research-page {
  --research-ink: #102d32;
  --research-blue: #4e8ea0;
  --research-coral: #d77b62;
  --research-gold: #d2a85b;
  background: var(--background);
}

.research-hero {
  min-height: min(760px, 82vh);
  display: grid;
  align-items: center;
  background:
    radial-gradient(circle at 78% 24%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 23rem),
    linear-gradient(135deg, var(--surface-muted), var(--background) 58%);
}

.research-hero-inner {
  padding: clamp(5rem, 13vw, 10rem) 0;
}

.research-hero h1 {
  max-width: 850px;
  margin-bottom: 1.7rem;
  font-size: clamp(3rem, 8vw, 7.4rem);
  letter-spacing: -0.055em;
}

.research-deck {
  max-width: 690px;
  margin-bottom: 2.8rem;
  color: var(--text-muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.scroll-prompt {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.scroll-line {
  width: 3.2rem;
  height: 1px;
  background: var(--accent);
}

.explainer {
  padding: clamp(4rem, 10vw, 9rem) 0;
  background: var(--research-ink);
  color: #e9f0eb;
}

.explainer-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.8fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}

.explainer-visual-wrap {
  position: sticky;
  top: 7rem;
}

.explainer-visual {
  overflow: hidden;
  border: 1px solid rgba(233, 240, 235, 0.18);
  border-radius: 20px;
  background: #173c42;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.22);
}

.visual-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 1.35rem 0;
  color: rgba(233, 240, 235, 0.68);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.model-diagram {
  display: block;
  width: 100%;
  margin-top: 0.2rem;
}

.diagram-bg {
  fill: #173c42;
}

.diagram-grid {
  fill: url(#grid-pattern);
  color: #d6e5dc;
}

.diagram-stage {
  opacity: 0;
  pointer-events: none;
  transition: opacity 350ms ease;
}

.explainer-visual[data-stage="0"] .diagram-stage-0,
.explainer-visual[data-stage="1"] .diagram-stage-1,
.explainer-visual[data-stage="2"] .diagram-stage-2,
.explainer-visual[data-stage="3"] .diagram-stage-3 {
  opacity: 1;
}

.diagram-eyebrow,
.node-label {
  fill: #9fd2c3;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.6px;
}

.diagram-title {
  fill: #eef5ef;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
}

.node {
  stroke-width: 1.5;
}

.node-gcm {
  fill: rgba(78, 142, 160, 0.24);
  stroke: #75b3bd;
}

.node-crm {
  fill: rgba(215, 123, 98, 0.17);
  stroke: #e39a7e;
}

.node-input,
.node-output {
  fill: rgba(210, 168, 91, 0.16);
  stroke: #d2a85b;
}

.node-ml {
  fill: rgba(159, 210, 195, 0.15);
  stroke: #9fd2c3;
}

.node-title,
.node-note,
.ml-symbol {
  fill: #eef5ef;
  font-family: var(--sans);
}

.node-title {
  font-size: 14px;
  font-weight: 700;
}

.node-title.centered,
.node-label.centered,
.node-note.centered {
  text-anchor: middle;
}

.node-note {
  fill: rgba(233, 240, 235, 0.64);
  font-size: 11px;
}

.vertical-label {
  text-anchor: middle;
}

.diagram-arrow,
.transfer-arrow {
  fill: none;
  color: #d2e5d8;
  stroke: currentColor;
  stroke-width: 2;
}

.crm-cells rect {
  fill: rgba(227, 154, 126, 0.46);
  stroke: rgba(255, 222, 196, 0.52);
  stroke-width: 1;
}

.ml-orbit {
  fill: none;
  stroke: #d2a85b;
  stroke-dasharray: 3 6;
  stroke-width: 2;
}

.ml-core {
  fill: #d2a85b;
}

.ml-symbol {
  text-anchor: middle;
  font-size: 15px;
  font-weight: 700;
}

.visual-caption {
  min-height: 4.2rem;
  margin: 0;
  padding: 1rem 1.35rem 1.3rem;
  border-top: 1px solid rgba(233, 240, 235, 0.14);
  color: rgba(233, 240, 235, 0.76);
  font-size: 0.88rem;
}

.explainer-steps {
  padding-bottom: 10vh;
}

.explainer-step {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 0;
  border-top: 1px solid rgba(233, 240, 235, 0.2);
  opacity: 0.42;
  transition: opacity 300ms ease;
}

.explainer-step:first-child {
  border-top: 0;
}

.explainer-step.is-active {
  opacity: 1;
}

.step-number {
  margin-bottom: 2.5rem;
  color: #9fd2c3;
  font-family: var(--serif);
  font-size: 1.35rem;
}

.explainer-step h2 {
  max-width: 480px;
  margin-bottom: 1.1rem;
  color: #eef5ef;
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -0.035em;
}

.explainer-step p {
  max-width: 510px;
  margin-bottom: 0;
  color: rgba(233, 240, 235, 0.7);
  font-size: 1.05rem;
}

.research-close-inner {
  max-width: 780px;
}

.research-close h2 {
  max-width: 780px;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  letter-spacing: -0.045em;
}

.research-close-inner > p:not(.section-kicker) {
  max-width: 620px;
  color: var(--text-muted);
  font-size: 1.1rem;
}

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

  .explainer-visual-wrap {
    position: relative;
    top: auto;
  }

  .explainer-step {
    min-height: auto;
    padding: 5rem 0;
  }
}

@media (max-width: 720px) {
  .research-hero h1 {
    font-size: clamp(2.8rem, 14vw, 5rem);
  }

  .diagram-title {
    font-size: 18px;
  }

  .explainer-step {
    padding: 4rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .diagram-stage,
  .explainer-step {
    transition: none;
  }
}