/* Research overview + sub-pages shared styles */

.research-hero {
  padding-block: calc(var(--nav-height) + var(--space-7)) var(--space-6);
}

.research-hero .eyebrow {
  margin-bottom: var(--space-3);
  display: inline-block;
}

.research-hero h1 {
  max-width: 18ch;
}

.research-hero .lede {
  margin-top: var(--space-4);
}

/* ===== Research graph ===== */
.research-graph-wrap {
  position: relative;
  width: 100%;
  height: 560px;
  margin-block: var(--space-6);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--bg-tertiary) 50%, transparent),
    color-mix(in srgb, var(--bg-tertiary) 0%, transparent));
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (max-width: 700px) {
  .research-graph-wrap { height: 460px; }
}

.research-graph {
  width: 100%;
  height: 100%;
  display: block;
}

.research-graph .link {
  stroke: var(--border-strong);
  stroke-opacity: 0.6;
  stroke-width: 1.5;
  cursor: pointer;
  transition: stroke-opacity var(--dur-base) var(--ease), stroke var(--dur-base) var(--ease);
}

.research-graph .link.is-faded { stroke-opacity: 0.12; }
.research-graph .link.is-active { stroke: var(--accent-primary); stroke-opacity: 0.95; stroke-width: 2.2; }

.research-graph .node-group { cursor: pointer; }

.research-graph .node-circle {
  fill: var(--accent-primary);
  stroke: var(--bg-primary);
  stroke-width: 3;
  transition: r var(--dur-base) var(--ease), fill var(--dur-base) var(--ease), opacity var(--dur-base) var(--ease);
}

.research-graph .node-circle.is-center {
  fill: var(--accent-secondary);
}

.research-graph .node-group.is-faded .node-circle { opacity: 0.28; }
.research-graph .node-group.is-active .node-circle { stroke: var(--accent-primary); stroke-width: 4; }

.research-graph .node-label {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  fill: var(--text-primary);
  pointer-events: none;
  text-anchor: middle;
  transition: opacity var(--dur-base) var(--ease);
}

.research-graph .node-label.is-center {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  fill: var(--text-primary);
}

.research-graph .node-group.is-faded .node-label { opacity: 0.3; }

.research-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.45;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-width: 320px;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
  z-index: 10;
}

.research-tooltip.is-visible { opacity: 1; }

.research-graph-legend {
  position: absolute;
  left: var(--space-4);
  bottom: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: var(--text-muted);
  pointer-events: none;
}

.research-graph-legend__item { display: flex; align-items: center; gap: var(--space-2); }

.research-graph-legend__dot {
  width: 10px; height: 10px; border-radius: 50%;
}

.research-graph-legend__dot--center { background: var(--accent-secondary); }
.research-graph-legend__dot--area { background: var(--accent-primary); }

.research-graph-hint {
  position: absolute;
  right: var(--space-4);
  bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  pointer-events: none;
}

/* ===== Area cards on research overview ===== */
.research-areas {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .research-areas { grid-template-columns: 1fr 1fr; }
}

.area-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: transform var(--dur-base) var(--ease),
              border-color var(--dur-base) var(--ease),
              box-shadow var(--dur-base) var(--ease);
}

.area-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.area-card__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-secondary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.area-card h3 {
  font-size: 1.35rem;
  margin: var(--space-1) 0;
}

.area-card__sub {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent-primary);
  font-size: 1rem;
}

.area-card__summary {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.area-card__arrow {
  margin-top: auto;
  color: var(--accent-primary);
  font-weight: 500;
  font-size: 0.9rem;
}

/* ===== Research sub-page ===== */
.research-detail {
  padding-block: calc(var(--nav-height) + var(--space-7)) var(--space-9);
}

.research-detail__breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.research-detail__breadcrumb a { color: var(--text-muted); text-decoration: none; }
.research-detail__breadcrumb a:hover { color: var(--accent-primary); }
.research-detail__breadcrumb .sep { margin: 0 var(--space-2); color: var(--border-strong); }

.research-detail h1 {
  margin-bottom: var(--space-3);
}

.research-detail__sub {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent-primary);
  font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
  margin-bottom: var(--space-7);
}

.research-detail .figure-placeholder {
  background: var(--bg-tertiary);
  border: 1px dashed var(--border-strong);
  padding: var(--space-7);
  border-radius: var(--radius-md);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-block: var(--space-6);
}

.research-detail .subthemes {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  margin-top: var(--space-5);
}

@media (min-width: 768px) {
  .research-detail .subthemes { grid-template-columns: 1fr 1fr; }
}

.subtheme {
  padding: var(--space-5);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.subtheme h4 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin-bottom: var(--space-2);
}

.subtheme p { font-size: 0.92rem; color: var(--text-secondary); margin: 0; }

.foundational {
  margin-block: var(--space-6);
  padding: var(--space-5) var(--space-6);
  border-left: 3px solid var(--accent-primary);
  background: var(--bg-tertiary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.foundational h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  margin-bottom: var(--space-3);
}

.foundational ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.foundational li { font-size: 0.95rem; color: var(--text-secondary); }
.foundational li cite { font-style: italic; color: var(--text-primary); }

/* Cross-page nav (prev/next research area) */
.research-detail__nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

.research-detail__nav a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--dur-base) var(--ease), background var(--dur-base) var(--ease);
}

.research-detail__nav a:hover {
  border-color: var(--accent-primary);
  background: var(--bg-secondary);
}

.research-detail__nav .dir {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.research-detail__nav .label {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.research-detail__nav a:last-child { text-align: right; }