/* ==================================================
   AGRISCAN RESEARCH — Editorial Styles
   Extends base.css + style.css design tokens.
   Do not redefine variables declared in style.css.
   ================================================== */


/* Research page background override (scoped to this page only) */
body.page-research {
  --color-bg: #FAF8F3;
  background-color: #FAF8F3;
}


/* ==================================================
   RESEARCH INDEX — Hero
   ================================================== */
.research-hero {
  padding: clamp(var(--space-12), 8vw, var(--space-20)) var(--space-6) clamp(var(--space-10), 6vw, var(--space-16));
  border-bottom: 1px solid var(--color-divider);
}

.research-hero__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: end;
}

.research-hero__eyebrow {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.research-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 1.2rem + 5vw, 5rem);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin: 0;
}

.research-hero__right {
  padding-bottom: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.research-hero__mission {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text-muted);
  line-height: 1.55;
  font-style: italic;
  margin: 0;
}

.research-hero__stats {
  display: flex;
  gap: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.research-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.research-hero__stat-value {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.research-hero__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

@media (max-width: 768px) {
  .research-hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    align-items: start;
  }
}

@media (max-width: 600px) {
  .research-hero {
    padding-left: var(--space-5);
    padding-right: var(--space-5);
  }
}


/* ==================================================
   TYPE BADGES
   ================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  line-height: 1.6;
  flex-shrink: 0;
}

.badge--research-brief {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.badge--white-paper {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.badge--analysis {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}


/* ==================================================
   TAG PILLS (topic tags on cards & paper header)
   ================================================== */
.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 1px var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

a.tag-pill:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}


/* ==================================================
   FEATURED PAPER
   ================================================== */
.featured-section {
  padding: var(--space-12) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}

.featured-section__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.featured-section__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.featured-section__label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-divider);
}

.featured-paper {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 0;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg);
}

.featured-paper__content {
  padding: var(--space-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  background: var(--color-primary-light);
  border-right: 1px solid rgba(74, 140, 63, 0.12);
}

.featured-paper__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.featured-paper__date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.featured-paper__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 1rem + 2.5vw, 2.5rem);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.12;
  text-decoration: none;
  display: block;
  transition: color var(--transition);
}

.featured-paper__title:hover {
  color: var(--color-primary);
}

.featured-paper__summary {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 54ch;
  margin: 0;
}

.featured-paper__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: var(--space-2);
}

.featured-paper__tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.featured-paper__cta {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
  flex-shrink: 0;
}

.featured-paper__cta:hover { color: var(--color-primary-hover); }

.featured-paper__cta::after {
  content: '→';
  transition: transform var(--transition);
}

.featured-paper__cta:hover::after { transform: translateX(4px); }

/* Right panel: decorative graphic */
.featured-paper__graphic {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  overflow: hidden;
  min-height: 280px;
}

.featured-paper__graphic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.featured-paper__graphic-svg {
  width: 140px;
  height: 140px;
  opacity: 0.18;
  color: var(--color-primary);
}

@media (max-width: 900px) {
  .featured-paper {
    grid-template-columns: 1fr;
  }
  .featured-paper__graphic { min-height: 160px; order: -1; }
  .featured-paper__content { padding: var(--space-7) var(--space-6); }
}


/* ==================================================
   TOOLBAR — Search + Tag Filters
   ================================================== */
/* Sentinel: an invisible marker just above the toolbar. When it scrolls up
   under the nav, the toolbar is docked — see the IntersectionObserver in index.njk. */
.toolbar-sentinel {
  height: 1px;
  margin-bottom: -1px;
  pointer-events: none;
}

.research-toolbar {
  /* Slim, single-row docked bar (~60px): tight vertical padding. */
  padding: var(--space-2) var(--space-6);
  position: sticky;
  /* One offset, driven by the JS-measured header height (falls back to 65px). */
  top: var(--header-h, 65px);
  z-index: 10;
  background: oklch(from var(--color-bg) l c h / 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  /* Docked affordance: border + shadow appear only when pinned (.is-docked). */
  border-bottom: 1px solid transparent;
  box-shadow: 0 0 0 0 transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.research-toolbar.is-docked {
  border-bottom-color: var(--color-divider);
  box-shadow: 0 6px 16px -12px oklch(from var(--color-text) l c h / 0.35);
}

.research-toolbar__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-5);
  /* Single row — the Topic group scrolls horizontally rather than wrapping. */
  flex-wrap: nowrap;
  min-width: 0;
}

.research-search {
  position: relative;
  flex-shrink: 0;
  width: 280px;
}

.research-search__icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
  pointer-events: none;
  display: flex;
  align-items: center;
}

.research-search__input {
  width: 100%;
  padding: var(--space-2) var(--space-4) var(--space-2) var(--space-8);
  font-size: var(--text-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
}

.research-search__input::placeholder { color: var(--color-text-faint); }

.research-search__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.1);
}

.toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--color-divider);
  flex-shrink: 0;
}

.tag-filters {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: nowrap;
}

/* Format has few options — keep its natural width, never shrink. */
.tag-filters--format {
  flex-shrink: 0;
}

/* Topic can be long: give it the remaining width as a horizontal scroll strip
   (single line, momentum scroll, hidden scrollbar, still keyboard/trackpad-scrollable). */
.tag-filters--topic {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;              /* Firefox */
  -webkit-overflow-scrolling: touch;
  scroll-padding-inline: var(--space-2);
}
.tag-filters--topic::-webkit-scrollbar { display: none; }  /* WebKit */

/* The group label stays pinned at the left while chips scroll under it. */
.tag-filters--topic .toolbar-group-label {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--color-bg);
  padding-right: var(--space-2);
}

.tag-filter__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.tag-filter__btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tag-filter__btn--active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* Group label inside filter rows */
.toolbar-group-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  white-space: nowrap;
  flex-shrink: 0;
  align-self: center;
}

@media (max-width: 768px) {
  .research-toolbar__inner {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }
  .research-search { width: 100%; }
  .toolbar-divider { display: none; }
  .tag-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
    scrollbar-width: none;
  }
  .tag-filters::-webkit-scrollbar { display: none; }
  .tag-filter__btn {
    min-height: 36px;
    flex-shrink: 0;
  }
}


/* ==================================================
   PAPERS LIST SECTION
   ================================================== */
.papers-section {
  padding: var(--space-10) var(--space-6) clamp(var(--space-16), 10vw, var(--space-32));
}

.papers-section__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.papers-section__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding-bottom: var(--space-5);
  border-bottom: 2px solid var(--color-text);
  margin-bottom: 0;
}

.papers-section__title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text);
}

.papers-section__count {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* Paper list: editorial divider rows, not card grid */
.papers-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.paper-card {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 0 var(--space-8);
  padding: var(--space-7) 0 var(--space-10);
  border-bottom: 1px solid var(--color-divider);
  text-decoration: none;
  /* Clear the sticky nav + docked filter bar on any in-page jump. */
  scroll-margin-top: calc(var(--header-h, 65px) + var(--docked-bar-h, 0px) + var(--space-4));
  color: inherit;
  align-items: start;
}

.paper-card:last-child { border-bottom: none; }

.paper-card__aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: 3px; /* optical alignment with title cap height */
}

.paper-card__date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  white-space: nowrap;
}

.paper-card__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.paper-card__title {
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 0.9rem + 1vw, 1.5rem);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.015em;
  line-height: 1.2;
  transition: color var(--transition);
}

.paper-card:hover .paper-card__title { color: var(--color-primary); }

.paper-card__summary {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 60ch;
  margin: 0;
}

.paper-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.paper-card__tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.paper-card__read-link {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--transition), transform var(--transition);
}

.paper-card__read-link::after {
  content: '→';
  transition: transform var(--transition);
}

.paper-card:hover .paper-card__read-link { opacity: 1; }
.paper-card:hover .paper-card__read-link::after { transform: translateX(3px); }

@media (max-width: 600px) {
  .paper-card {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .paper-card__aside {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
  }
  .paper-card__read-link { opacity: 1; }
}


/* ==================================================
   NO RESULTS / EMPTY STATE
   ================================================== */
.no-results-message {
  padding: var(--space-16) 0;
  text-align: center;
  display: none;
}

.no-results-message.visible { display: block; }

.no-results-message p {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin: 0;
}

.research-empty {
  padding: clamp(var(--space-20), 12vw, var(--space-32)) var(--space-6);
  text-align: center;
}

.research-empty__inner {
  max-width: 360px;
  margin: 0 auto;
}

.research-empty__icon {
  display: block;
  margin: 0 auto var(--space-6);
  width: 44px;
  height: 44px;
  color: var(--color-text-faint);
}

.research-empty__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.research-empty__body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}


/* ==================================================
   INDIVIDUAL PAPER — Header
   ================================================== */
.paper-header {
  padding: var(--space-10) var(--space-6) var(--space-12);
  border-bottom: 1px solid var(--color-divider);
}

@media (max-width: 600px) {
  .paper-header {
    padding: var(--space-6) var(--space-5) var(--space-8);
  }
  .paper-back {
    margin-bottom: var(--space-6);
  }
}

.paper-header__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.paper-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-faint);
  text-decoration: none;
  margin-bottom: var(--space-10);
  transition: color var(--transition);
}

.paper-back:hover { color: var(--color-primary); }

.paper-back__arrow {
  transition: transform var(--transition);
  display: inline-block;
}

.paper-back:hover .paper-back__arrow { transform: translateX(-4px); }

.paper-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.paper-header__date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.paper-header__dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-divider);
  flex-shrink: 0;
}

.paper-header__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1rem + 4vw, 3.75rem);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-6);
  max-width: 22ch;
}

.paper-header__summary {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 60ch;
  margin-bottom: var(--space-7);
}

.paper-header__tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}


/* ==================================================
   INDIVIDUAL PAPER — Two-column body
   ================================================== */
.paper-body {
  padding: var(--space-12) var(--space-6) clamp(var(--space-16), 10vw, var(--space-32));
}

.paper-body__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 268px;
  gap: var(--space-16);
  align-items: start;
}

/* ---- Article content column ---- */
.paper-article {
  min-width: 0;
}

/* Key Takeaways */
.paper-takeaways {
  background: var(--color-primary-light);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-6) var(--space-7);
  margin-bottom: var(--space-10);
}

.paper-takeaways__title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  font-family: var(--font-body);
}

.paper-takeaways__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.paper-takeaways__list li {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.6;
  padding-left: var(--space-5);
  position: relative;
  max-width: 60ch;
}

.paper-takeaways__list li::before {
  content: '■';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.55rem;
  top: 0.38em;
}

/* Article body typography */
.paper-article h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: var(--space-12) 0 var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  /* TOC jumps land clear of the sticky nav (paper pages have no filter bar). */
  scroll-margin-top: calc(var(--header-h, 65px) + var(--space-6));
}

.paper-article h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.paper-article h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: var(--space-8) 0 var(--space-3);
}

.paper-article p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.85;
  margin-bottom: var(--space-5);
  max-width: 68ch;
}

.paper-article ul,
.paper-article ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-5);
}

.paper-article li {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-2);
  max-width: 62ch;
}

.paper-article blockquote {
  border-left: 2px solid var(--color-primary);
  margin: var(--space-8) 0;
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.paper-article blockquote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.5;
  margin: 0;
  max-width: 52ch;
}

.paper-article strong {
  font-weight: 600;
  color: var(--color-text);
}

.paper-article a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: rgba(74, 140, 63, 0.35);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition);
}

.paper-article a:hover {
  text-decoration-color: var(--color-primary);
}

/* References section */
.paper-article .references {
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 2px solid var(--color-text);
}

.paper-article .references h2 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text);
  border-top: none;
  padding-top: 0;
  margin-top: 0;
  margin-bottom: var(--space-6);
}

.paper-article .references ol {
  padding-left: var(--space-5);
  counter-reset: none;
}

.paper-article .references li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-3);
  max-width: 66ch;
}

/* ---- TOC Sidebar ---- */
.paper-toc {
  position: sticky;
  top: calc(65px + var(--space-8));
  max-height: calc(100vh - 130px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-left: var(--space-8);
  border-left: 1px solid var(--color-divider);
}

.paper-toc__title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
  font-family: var(--font-body);
}

.paper-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.paper-toc__item {
  border-left: 2px solid transparent;
  /* offset the border against the parent border-left */
  margin-left: calc(-1 * var(--space-8) - 1px);
  padding-left: calc(var(--space-8) - 2px);
  transition: border-color var(--transition);
}

.paper-toc__item.active {
  border-left-color: var(--color-primary);
}

.paper-toc__link {
  display: block;
  padding: 3px 0;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  line-height: 1.5;
  transition: color var(--transition);
}

.paper-toc__link:hover,
.paper-toc__item.active .paper-toc__link {
  color: var(--color-primary);
}

.paper-toc__link--sub {
  padding-left: var(--space-4);
  font-size: 0.7rem;
  opacity: 0.85;
}

@media (max-width: 960px) {
  .paper-body__inner {
    grid-template-columns: 1fr;
  }

  .paper-toc {
    position: static;
    padding-left: 0;
    border-left: none;
    border-bottom: 1px solid var(--color-divider);
    padding-bottom: var(--space-6);
    margin-bottom: var(--space-10);
    max-height: none;
    overflow: visible;
    order: -1; /* TOC above article on mobile */
  }

  .paper-toc__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-4);
  }

  .paper-toc__item {
    border-left: none;
    margin-left: 0;
    padding-left: 0;
  }

  .paper-toc__link--sub { padding-left: 0; }
}


/* ==================================================
   RELATED PAPERS
   ================================================== */
.paper-related {
  padding: var(--space-12) var(--space-6) clamp(var(--space-16), 10vw, var(--space-32));
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.paper-related__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.paper-related__header {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.paper-related__header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-divider);
}

.paper-related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
}

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

.related-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.related-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.related-card__date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.related-card__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.25;
  transition: color var(--transition);
  max-width: 100%;
}

.related-card:hover .related-card__title { color: var(--color-primary); }

.related-card__summary {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  max-width: 100%;
}


/* ==================================================
   FILTER HIDDEN STATE — reliable override of display:grid
   ================================================== */
.paper-card--hidden {
  display: none !important;
}

/* ==================================================
   SCROLL REVEAL (inherited pattern from app.js)
   ================================================== */
.research-reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.research-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}