/* Research kit timeline (.rk-tl*). Compact date rail + inline env/app meta. */
/* Both themes: tokens from rk-base / article theme vars (light + dark). */
/* ============================================================
   TIMELINE
   ============================================================ */
.research-article .timeline-section {
  background: var(--color-bg-deep);
  border-block: 1px solid var(--color-border-soft);
}
.research-article .section-head {
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
  max-width: 62ch;
}
.research-article .section-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}
.research-article .section-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-2xl);
  letter-spacing: -0.035em;
  margin-bottom: var(--space-4);
  scroll-margin-top: 90px;
}
.research-article .section-head p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

.research-article .tl {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.research-article .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    var(--color-border) 6%,
    var(--color-border) 94%,
    transparent
  );
}
@media (min-width: 860px) {
  .research-article .tl::before {
    left: 92px;
  }
}

.research-article .rk-tl-phase {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-faint);
  padding-left: 34px;
  position: relative;
  margin-top: var(--space-4);
}
.research-article .rk-tl-phase:first-child {
  margin-top: 0;
}
.research-article .rk-tl-phase::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 22px;
  height: 1px;
  background: var(--color-border);
}
@media (min-width: 860px) {
  .research-article .rk-tl-phase {
    padding-left: 118px;
  }
  .research-article .rk-tl-phase::before {
    left: 92px;
  }
}
.research-article .rk-tl-phase b {
  color: var(--color-attacker);
  font-weight: 500;
}

.research-article .rk-tl-item {
  position: relative;
  padding-left: 34px;
  display: grid;
  gap: var(--space-2);
}
@media (min-width: 860px) {
  .research-article .rk-tl-item {
    /* Slim date-only rail */
    grid-template-columns: 88px minmax(0, 1fr);
    padding-left: 0;
    gap: var(--space-5);
    align-items: start;
  }
}

/* Left rail: date only */
.research-article .rk-tl-rail {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 0;
}
@media (min-width: 860px) {
  .research-article .rk-tl-rail {
    text-align: right;
    padding-right: var(--space-5);
    align-items: flex-end;
    padding-top: 2px;
  }
}
.research-article .rk-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--color-bg-deep);
  border: 1px solid var(--color-border);
  z-index: 1;
}
.research-article .rk-tl-item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-text-faint);
  z-index: 2;
}
@media (min-width: 860px) {
  .research-article .rk-tl-item::before {
    left: 85px;
  }
  .research-article .rk-tl-item::after {
    left: 90px;
  }
}
.research-article .rk-tl-item[data-sev="high"]::after {
  background: var(--color-attacker);
  box-shadow: 0 0 0 3px var(--color-attacker-dim);
}
.research-article .rk-tl-item[data-sev="crit"]::after {
  background: var(--color-danger);
  box-shadow: 0 0 0 3px var(--color-danger-dim);
}
.research-article .rk-tl-item[data-sev="agent"]::after {
  background: var(--color-agent);
  box-shadow: 0 0 0 3px var(--color-agent-dim);
}
.research-article .rk-tl-item[data-sev="ops"]::after {
  background: var(--color-agent);
}

.research-article .rk-tl-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.research-article .rk-tl-date small {
  display: block;
  color: var(--color-text-faint);
  font-weight: 400;
  margin-top: 1px;
  letter-spacing: 0.06em;
  font-size: 0.625rem;
}

.research-article .rk-tl-body h4 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  margin: 0 0 var(--space-2);
  line-height: 1.3;
}
.research-article .rk-tl-body p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Compact env/app meta under title — one wrapping row, not a stacked rail */
.research-article .rk-tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  margin: 0 0 var(--space-2);
}
.research-article .rk-tl-meta-group {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  min-width: 0;
}
.research-article .rk-tl-meta-k {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  line-height: 1;
  flex: none;
}
.research-article .rk-tl-place-list {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  min-width: 0;
}
.research-article .rk-tl-place {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  max-width: 100%;
  min-width: 0;
  padding: 1px 6px 1px 2px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  border: 1px solid var(--color-border-soft);
}
.research-article .rk-tl-place-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  line-height: 1.2;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 9.5rem;
}

/* Glanceable bullet list */
.research-article .rk-tl-bullets {
  margin: 0 0 var(--space-2);
  padding-left: 1.05em;
  list-style: disc;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.research-article .rk-tl-bullets li {
  margin: 0.12em 0;
  padding-left: 0.1em;
}
.research-article .rk-tl-bullets li::marker {
  color: var(--color-text-faint);
}
.research-article .rk-tl-bullets code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: 3px;
  padding: 0 0.3em;
}

.research-article .rk-tl-logo {
  width: 14px;
  height: 14px;
  object-fit: contain;
  border-radius: 2px;
  background: color-mix(in srgb, var(--color-surface-2, var(--color-surface)) 90%, #fff 10%);
  border: 1px solid var(--color-border-soft);
  padding: 1px;
  box-sizing: content-box;
  flex: none;
  opacity: 0.95;
}
.research-article .rk-tl-logo:hover,
.research-article .rk-tl-logo:focus-visible {
  opacity: 1;
}

/* Legacy body logo row (unused when meta chips are present) */
.research-article .rk-tl-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-2);
}

.research-article .rk-tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: var(--space-1);
}
.research-article .tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--color-border);
  color: var(--color-text-faint);
  background: var(--color-surface);
  white-space: nowrap;
}
.research-article .tag.t-agent {
  color: var(--color-agent);
  border-color: var(--color-agent-dim);
  background: var(--color-agent-dim);
}
.research-article .tag.t-exp {
  color: var(--color-attacker);
  border-color: var(--color-attacker-line);
  background: var(--color-attacker-dim);
}
.research-article .tag.t-crit {
  color: var(--color-danger);
  border-color: var(--color-danger-dim);
  background: var(--color-danger-dim);
}
.research-article .tag.t-ext {
  color: var(--color-ext);
  border-color: var(--color-ext-dim);
  background: var(--color-ext-dim);
}
.research-article .tag.t-ops {
  color: var(--color-gold);
  border-color: var(--color-gold-dim);
  background: var(--color-gold-dim);
}