/* ============================================================
   AI Safety Corner — Research Highlights Styles
   Covers both the index page and individual paper pages.
   Depends on variables defined in ../styles.css
   ============================================================ */

/* ─── Highlights accent ─────────────────────────────────── */
:root {
  --highlights-accent:      #5b8af5;
  --highlights-accent-glow: rgba(91, 138, 245, 0.14);
  --highlights-accent-mid:  rgba(91, 138, 245, 0.22);
  --highlights-accent-soft: rgba(91, 138, 245, 0.06);
}

/* ─── Shared page shell ─────────────────────────────────── */
.highlights-page,
.paper-page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding-top: 56px; /* nav height */
}

/* ================================================================
   HIGHLIGHTS INDEX PAGE
   ================================================================ */

/* ─── Page hero ─────────────────────────────────────────── */
.highlights-hero {
  position: relative;
  padding: 5rem 2rem 4rem;
  border-bottom: 1px solid rgba(197, 184, 245, 0.06);
  overflow: hidden;
}

.highlights-hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -60px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--highlights-accent-glow) 0%, transparent 65%);
  pointer-events: none;
}

.highlights-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.highlights-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.highlights-eyebrow-glyph {
  color: var(--highlights-accent);
  font-size: 1rem;
}

.highlights-eyebrow-zone {
  color: var(--highlights-accent);
}

.highlights-eyebrow-sep {
  color: var(--ink-micro);
}

.highlights-eyebrow-label {
  color: var(--ink-muted);
}

.highlights-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  line-height: 1.18;
  color: var(--ink-primary);
  margin-bottom: 1rem;
}

.highlights-hero-title em {
  display: inline-block;
  font-style: italic;
  color: transparent;
  background: linear-gradient(135deg, var(--highlights-accent) 0%, var(--accent-lavender) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  padding: 0.02em 0.12em 0.12em 0;
}

.highlights-hero-subtitle {
  font-size: 1rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: 2rem;
}

.highlights-stats {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.highlights-stat {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.70rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--highlights-accent);
}

.highlights-stat-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  opacity: 1;
}

/* ─── Controls bar ──────────────────────────────────────── */
.highlights-controls {
  position: sticky;
  top: 56px;
  z-index: 50;
  background: rgba(7, 9, 26, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(197, 184, 245, 0.07);
  padding: 1rem 2rem;
}

.highlights-controls-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Search */
.highlights-search-wrap {
  position: relative;
  flex: 1;
  min-width: 220px;
  max-width: 400px;
}

.highlights-search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-muted);
  font-size: 0.9rem;
  pointer-events: none;
  font-family: var(--font-mono);
}

.highlights-search {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.4rem;
  background: var(--bg-surface);
  border: 1px solid rgba(197, 184, 245, 0.12);
  border-radius: 2px;
  color: var(--ink-primary);
  font-family: var(--font-body);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.highlights-search::placeholder { color: var(--ink-muted); }

.highlights-search:focus {
  border-color: var(--highlights-accent);
  box-shadow: 0 0 0 2px var(--highlights-accent-glow);
}

/* Difficulty filter pills */
.highlights-filter-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-pill,
.topic-pill {
  appearance: none;
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(197, 184, 245, 0.14);
  background: rgba(20, 24, 56, 0.92);
  color: var(--ink-secondary);
  border-radius: 2px;
  padding: 0.32rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s, transform 0.15s;
}

.filter-pill {
  border-radius: 2px;
  transition: all 0.2s;
  font-weight: 400;
  letter-spacing: 0.06em;
}

.topic-pill {
  letter-spacing: 0.08em;
}

.filter-pill:hover,
.topic-pill:hover {
  border-color: rgba(197, 184, 245, 0.26);
  background: rgba(28, 33, 72, 0.96);
  color: var(--ink-primary);
  transform: translateY(-1px);
}

.filter-pill:focus-visible,
.topic-pill:focus-visible {
  outline: none;
  border-color: var(--highlights-accent);
  box-shadow: 0 0 0 2px var(--highlights-accent-glow);
}

.filter-pill--beginner {
  border: 1px solid rgba(45, 212, 191, 0.2);
  color: var(--accent-teal);
}

.filter-pill--beginner:hover,
.filter-pill--beginner.is-active {
  border-color: var(--accent-teal);
  background: rgba(45, 212, 191, 0.08);
  color: var(--accent-teal);
  transform: none;
}

.filter-pill--intermediate {
  border: 1px solid rgba(245, 200, 66, 0.2);
  color: var(--accent-gold);
}

.filter-pill--intermediate:hover,
.filter-pill--intermediate.is-active {
  border-color: var(--accent-gold);
  background: rgba(245, 200, 66, 0.08);
  color: var(--accent-gold);
  transform: none;
}

.filter-pill--advanced {
  border: 1px solid rgba(240, 62, 138, 0.2);
  color: var(--accent-pink);
}

.filter-pill--advanced:hover,
.filter-pill--advanced.is-active {
  border-color: var(--accent-pink);
  background: rgba(240, 62, 138, 0.08);
  color: var(--accent-pink);
  transform: none;
}

/* Topic filters row */
.highlights-topics {
  padding: 0.75rem 2rem;
  background: transparent;
}

.highlights-topics-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.highlights-topics-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 700;
  margin-right: 0.25rem;
  white-space: nowrap;
}

#topicFilters {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* Active filter states */
.filter-pill.is-active {
  background: var(--highlights-accent-soft);
  border-color: var(--highlights-accent-mid);
  color: var(--highlights-accent);
}

.topic-pill.is-active {
  background: var(--highlights-accent-soft);
  border-color: var(--highlights-accent-mid);
  color: var(--highlights-accent);
}

/* ─── Body / results area ───────────────────────────────── */
.highlights-body {
  padding: 0.75rem 2rem 6rem;
}

.highlights-body-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

/* Results count + clear row */
.highlights-results-line {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0 0.5rem;
}

.highlights-results-line.is-visible {
  display: flex;
}

.highlights-results-count {
  font-family: var(--font-mono);
  font-size: 0.70rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.highlights-clear-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--highlights-accent);
  cursor: pointer;
  opacity: 0.8;
  transition: opacity 0.2s;
  padding: 0;
}

.highlights-clear-btn:hover { opacity: 1; }
.highlights-clear-btn:not(.is-visible) { display: none; }

/* ─── Featured research card ───────────────────────────────── */
.ph-featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid rgba(91, 138, 245, 0.2);
  border-radius: 4px;
  background: var(--bg-surface);
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
  will-change: transform;
  transition:
    border-color 0.25s,
    transform 0.25s var(--ease-out),
    box-shadow 0.25s var(--ease-out),
    background 0.25s;
  text-decoration: none;
  color: inherit;
}

.ph-featured-card::before,
.ph-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--highlights-accent) 0%, var(--accent-lavender) 100%);
  opacity: 0.7;
}

.ph-featured-card::after,
.ph-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(70% 55% at 50% 0%, rgba(91, 138, 245, 0.16), transparent 72%);
  opacity: 0;
  pointer-events: none;
  transform: scale(0.98);
  transition:
    opacity 0.25s,
    transform 0.45s var(--ease-out);
}

.ph-featured-card:hover,
.ph-card:hover {
  border-color: rgba(91, 138, 245, 0.35);
  transform: translateY(-4px) translateX(6px) scale(1.01);
  box-shadow: 0 10px 34px rgba(91, 138, 245, 0.08);
  background:
    linear-gradient(180deg, rgba(22, 28, 68, 0.96), rgba(12, 15, 37, 0.96)),
    var(--bg-surface);
}

.ph-featured-card:hover::before,
.ph-card:hover::before {
  opacity: 1;
}

.ph-featured-card:hover::after,
.ph-card:hover::after {
  opacity: 1;
  transform: scale(1);
}

.ph-featured-left {
  padding: 2.5rem;
  border-right: 1px solid rgba(197, 184, 245, 0.07);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ph-featured-right {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ph-featured-kicker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--highlights-accent);
  margin-bottom: 1.25rem;
}

.ph-featured-kicker-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--highlights-accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50%       { opacity: 1; }
}

.ph-featured-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.5vw, 2.4rem);
  line-height: 1.15;
  color: var(--ink-primary);
  margin-bottom: 1.25rem;
  flex: 1;
}

.ph-featured-meta-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.ph-featured-authors {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.ph-featured-takeaway {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.4vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-primary);
  font-style: italic;
  margin-bottom: 1.5rem;
  flex: 1;
}

.ph-featured-topics {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.ph-featured-read {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--highlights-accent);
  transition:
    gap 0.2s,
    color 0.2s,
    transform 0.2s;
}

.ph-featured-card:hover .ph-featured-read {
  color: var(--ink-primary);
  gap: 0.75rem;
}

/* ─── Paper card grid ───────────────────────────────────── */
.ph-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

/* ─── Individual paper card ─────────────────────────────── */
.ph-card {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  border: 1px solid rgba(197, 184, 245, 0.07);
  border-radius: 3px;
  background: var(--bg-surface);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  will-change: transform;
  transition:
    transform 0.25s var(--ease-out),
    border-color 0.22s,
    background 0.22s,
    box-shadow 0.25s var(--ease-out);
}

.ph-card-featured-dot {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--highlights-accent);
  opacity: 0.7;
}

.ph-card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}

.ph-card-topic {
  display: inline-block;
  padding: 0.32rem 0.7rem;
  border: 1px solid rgba(197, 184, 245, 0.12);
  border-radius: 999px;
  background: rgba(20, 24, 56, 0.92);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: rgba(200, 205, 238, 0.88);
}

.ph-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.25;
  font-weight: 400;
  color: var(--ink-primary);
  margin-bottom: 0.45rem;
  flex: 1;
}

.ph-card-byline {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  margin-bottom: 0.75rem;
}

.ph-card-takeaway {
  font-size: 0.84rem;
  color: var(--ink-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
}

.ph-card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(197, 184, 245, 0.05);
}

.ph-card-footer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ph-card-reading-time {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--highlights-accent);
  white-space: nowrap;
  transition:
    color 0.2s,
    transform 0.2s;
}

.ph-card-reading-time .card-read-arrow {
  position: relative;
  display: inline-block;
  width: 0.48rem;
  height: 0.32rem;
  font-size: 0;
  line-height: 1;
}

.ph-card-reading-time .card-read-arrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0.34rem;
  border-top: 1px solid currentColor;
  transform: translateY(-50%);
}

.ph-card-reading-time .card-read-arrow::after {
  content: "";
  position: absolute;
  right: 0.02rem;
  top: 50%;
  width: 0.16rem;
  height: 0.16rem;
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  transform: translateY(-50%) rotate(45deg);
}

.ph-card:hover .ph-card-reading-time {
  color: var(--ink-primary);
}

.ph-card:hover .ph-card-reading-time .card-read-arrow {
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.18));
}

/* ─── Empty state ───────────────────────────────────────── */
.highlights-empty {
  display: none;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 5rem 2rem;
  gap: 1rem;
}

.highlights-empty.is-visible { display: flex; }

.highlights-empty-glyph {
  font-size: 3rem;
  color: var(--ink-micro);
  opacity: 0.4;
  line-height: 1;
}

.highlights-empty-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--ink-secondary);
}

.highlights-empty-body {
  font-size: 0.875rem;
  color: var(--ink-muted);
  max-width: 320px;
  line-height: 1.65;
}

.highlights-empty-reset {
  margin-top: 0.5rem;
  padding: 0.5rem 1.25rem;
  border: 1px solid rgba(91, 138, 245, 0.25);
  border-radius: 2px;
  background: transparent;
  color: var(--highlights-accent);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
}

.highlights-empty-reset:hover {
  background: var(--highlights-accent-soft);
  border-color: var(--highlights-accent);
}

/* ─── Difficulty badges (shared, overriding accent) ─────── */
.difficulty-badge {
  appearance: none;
  display: inline-flex;
  align-items: center;
  padding: 0.32rem 0.7rem;
  border-radius: 2px;
  background: rgba(20, 24, 56, 0.92);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.difficulty-badge--beginner {
  background: rgba(45, 212, 191, 0.08);
  color: var(--accent-teal);
  border: 1px solid rgba(45, 212, 191, 0.28);
}

.difficulty-badge--intermediate {
  background: rgba(245, 200, 66, 0.08);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 200, 66, 0.28);
}

.difficulty-badge--advanced {
  background: rgba(240, 62, 138, 0.08);
  color: var(--accent-pink);
  border: 1px solid rgba(240, 62, 138, 0.28);
}

/* Active state for highlights section */
.filter-pill--beginner.is-active {
  background: rgba(45, 212, 191, 0.08);
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  transform: none;
}
.filter-pill--intermediate.is-active {
  background: rgba(245, 200, 66, 0.08);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  transform: none;
}
.filter-pill--advanced.is-active {
  background: rgba(240, 62, 138, 0.08);
  border-color: var(--accent-pink);
  color: var(--accent-pink);
  transform: none;
}

/* ─── Scroll reveal animation for cards ────────────────── */
.ph-card.reveal,
.ph-featured-card.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out), border-color 0.22s, background 0.22s, box-shadow 0.25s var(--ease-out);
}

.ph-card.reveal.is-visible,
.ph-featured-card.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.ph-card.reveal.is-visible:hover,
.ph-featured-card.reveal.is-visible:hover {
  transform: translateY(-4px) translateX(8px) scale(1.01);
}

/* ================================================================
   INDIVIDUAL PAPER PAGE
   ================================================================ */

.paper-page-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

/* ─── Paper header ──────────────────────────────────────── */
.paper-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(197, 184, 245, 0.07);
}

.paper-header-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.paper-header-zone {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.paper-header-zone .zone-glyph-inline {
  color: var(--highlights-accent);
}

.paper-reading-time {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--ink-muted);
  margin-left: 0.35rem;
}

.paper-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.8vw, 2.8rem);
  line-height: 1.1;
  color: var(--ink-primary);
  margin-bottom: 1.2rem;
}

/* ─── Metadata row ──────────────────────────────────────── */
.paper-meta-row {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1.25rem 1.5rem;
  background: var(--bg-surface);
  border: 1px solid rgba(197, 184, 245, 0.08);
  border-radius: 3px;
  margin-bottom: 1.5rem;
}

.paper-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-right: 1.5rem;
  border-right: 1px solid rgba(197, 184, 245, 0.08);
}

.paper-meta-item:last-child {
  border-right: none;
  padding-right: 0;
}

.paper-meta-label {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-primary);
  font-weight: 700;
}

.paper-meta-value {
  font-size: 0.8rem;
  color: var(--ink-secondary);
  font-weight: 500;
}

.paper-topics-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.paper-topic-tag {
  display: inline-block;
  padding: 0.38rem 0.8rem;
  border: 1px solid rgba(108, 119, 196, 0.34);
  border-radius: 999px;
  background: rgba(25, 31, 73, 0.95);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: rgba(200, 205, 238, 0.88);
}

/* ─── One-line takeaway ──────────────────────────────────── */
.paper-takeaway {
  background: var(--bg-surface);
  border: 1px solid rgba(197, 184, 245, 0.08);
  border-left: 3px solid var(--highlights-accent);
  border-radius: 0 2px 2px 0;
  padding: 1.4rem 1.5rem;
  margin-bottom: 2.5rem;
}

.paper-takeaway-label {
  margin-bottom: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--highlights-accent);
}

.paper-takeaway-text {
  font-size: 0.98rem;
  color: var(--ink-primary);
  line-height: 1.72;
  max-width: none;
}

/* ─── Body sections ─────────────────────────────────────── */
.paper-body {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.paper-section-block {
  padding: 2rem 0;
}

.paper-section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--highlights-accent);
}

.paper-section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(197, 184, 245, 0.09);
}

.paper-prose {
  font-size: 0.925rem;
  color: var(--ink-secondary);
  line-height: 1.8;
}

.paper-prose p + p { margin-top: 1em; }

/* Why it matters — left accent */
.paper-section-block--matters .paper-prose {
  padding-left: 1.25rem;
  border-left: 2px solid rgba(91, 138, 245, 0.28);
}

/* Core idea — subtle surface */
.paper-section-block--core .paper-prose {
  padding: 1.25rem 1.5rem;
  background: rgba(197, 184, 245, 0.03);
  border: 1px solid rgba(197, 184, 245, 0.07);
  border-radius: 3px;
}

/* Key findings — list */
.paper-findings-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.paper-finding-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.925rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

.paper-finding-item::before {
  content: '◆';
  color: var(--highlights-accent);
  font-size: 0.45rem;
  opacity: 0.6;
  margin-top: 0.55em;
  flex-shrink: 0;
}

/* Strengths / limitations lists */
.paper-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.paper-checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.925rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.paper-checklist-item--strength::before {
  content: '✓';
  color: var(--accent-teal);
  font-size: 0.75rem;
  margin-top: 0.15em;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.paper-checklist-item--limit::before {
  content: '↳';
  color: var(--accent-gold);
  font-size: 0.75rem;
  margin-top: 0.1em;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.paper-checklist-item--question::before {
  content: '?';
  color: var(--accent-lavender);
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 700;
  margin-top: 0.1em;
  flex-shrink: 0;
}

/* Recommended for — tag cloud */
.paper-recommended-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.paper-recommended-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid rgba(91, 138, 245, 0.18);
  border-radius: 2px;
  background: var(--highlights-accent-soft);
  color: var(--ink-secondary);
  font-size: 0.925rem;
  line-height: 1.4;
}

.paper-recommended-icon {
  color: var(--highlights-accent);
  font-size: 0.7rem;
  opacity: 0.7;
}

/* ─── Source links ──────────────────────────────────────── */
.paper-source-links {
  margin-top: 2rem;
}

.paper-source-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.paper-source-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-surface);
  border: 1px solid rgba(197, 184, 245, 0.08);
  border-radius: 2px;
  text-decoration: none;
  color: var(--ink-secondary);
  font-size: 0.925rem;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.paper-source-btn:hover {
  border-color: rgba(91, 138, 245, 0.3);
  color: var(--ink-primary);
  background: var(--bg-mid);
}

.paper-source-btn-icon {
  font-size: 0.7rem;
  color: var(--highlights-accent);
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.paper-source-btn-type {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-left: auto;
  flex-shrink: 0;
}

/* ─── Back link ─────────────────────────────────────────── */
.paper-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 2.5rem 0 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--highlights-accent);
  opacity: 0.8;
  transition: opacity 0.2s;
}

.paper-back-link::before {
  content: "←";
  display: inline-block;
  flex: 0 0 auto;
  line-height: 1;
  letter-spacing: 0;
}

.paper-back-link:hover { opacity: 1; }

/* ─── Not found ────────────────────────────────────────── */
.paper-not-found {
  padding: 6rem 2rem;
  text-align: center;
}

.paper-not-found-glyph {
  font-size: 3rem;
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
}

.paper-not-found-title {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--ink-secondary);
  margin-bottom: 1rem;
}

.paper-not-found-body {
  color: var(--ink-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.paper-not-found-link {
  color: var(--highlights-accent);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

.paper-not-found-link:hover { color: var(--ink-primary); }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 1024px) {
  .ph-featured-card {
    grid-template-columns: 1fr;
  }
  .ph-featured-left {
    border-right: none;
    border-bottom: 1px solid rgba(197, 184, 245, 0.07);
    padding-bottom: 1.75rem;
  }
}

@media (max-width: 800px) {
  .ph-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .highlights-hero {
    padding: 3.5rem 1.25rem 2.5rem;
  }

  .highlights-controls {
    padding: 0.75rem 1.25rem;
  }

  .highlights-controls-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .highlights-search-wrap {
    max-width: 100%;
  }

  .highlights-filter-group {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
  }

  .highlights-topics {
    padding: 0.6rem 1.25rem;
  }

  .highlights-body {
    padding: 2.5rem 2rem 6rem;
  }

  .ph-featured-left,
  .ph-featured-right {
    padding: 1.5rem;
  }

  .paper-page-inner {
    padding: 2rem 1.25rem 4rem;
  }

  .paper-title {
    font-size: clamp(1.8rem, 7vw, 2.6rem);
  }

  .paper-meta-row {
    flex-direction: column;
    gap: 0.65rem;
  }

  .paper-source-buttons {
    flex-direction: column;
  }
}

/* ─── Pagination accent ────────────────────────────────────── */
.pagination-page.is-active {
  background: var(--highlights-accent-soft);
  color: var(--highlights-accent);
  border-color: var(--highlights-accent-mid);
}

/* ─── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--highlights-accent); border-radius: 3px; }
html { scrollbar-color: var(--highlights-accent) transparent; scrollbar-width: thin; }