/* ============================================================
   Research papers & essays — index + detail
   Uses the site's existing tokens, so light/dark come free.
   ============================================================ */

.paper-page, .papers-page { padding-top: 72px; }

/* ---------- Detail hero ---------- */
.paper-hero {
  display: grid;
  grid-template-columns: 1fr minmax(230px, 320px);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: start;
  padding-block: clamp(1.5rem, 4vw, 2.8rem) clamp(2rem, 5vw, 3.2rem);
}
.paper-hero-copy { display: grid; gap: 1rem; justify-items: start; }
.paper-kicker {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.72rem; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--gold); font-weight: 600;
}
.paper-kicker svg { flex: none; }
.paper-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  color: var(--ink);
}
.paper-byline { color: var(--ink-soft); font-size: 1rem; }
.paper-byline strong { color: var(--gold-bright); font-weight: 600; }

.paper-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.paper-chip {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--ink-soft);
  background: color-mix(in srgb, var(--surface) 60%, transparent);
}
.paper-chip svg { color: var(--gold); flex: none; }

.paper-lede { color: var(--ink-soft); font-size: 1.05rem; line-height: 1.75; max-width: 56ch; }
.paper-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 0.4rem; }
.paper-free { color: var(--ink-muted); font-size: 0.85rem; }

/* Document-looking cover card */
.paper-cover {
  position: sticky;
  top: 92px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: 0 22px 50px rgba(0, 0, 0, 0.45);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
html[data-theme="light"] .paper-cover { box-shadow: 0 18px 40px rgba(90, 70, 30, 0.22); }
.paper-cover:hover { transform: translateY(-5px); }
.paper-cover img { width: 100%; display: block; }
.paper-cover-tag {
  position: absolute; left: 0; bottom: 0; right: 0;
  padding: 0.55rem 0.9rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.72));
  color: #f3ecd9;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- Body sections ---------- */
.paper-body {
  display: grid;
  grid-template-columns: 1fr minmax(230px, 310px);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding-block: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 1px solid var(--border-soft);
  align-items: start;
}
.paper-abstract p { color: var(--ink-soft); line-height: 1.8; margin-bottom: 1rem; }
.paper-abstract em { color: var(--gold-bright); font-style: italic; }
.paper-themes { list-style: none; margin: 0.4rem 0 0; padding: 0; display: grid; gap: 0.65rem; }
.paper-themes li {
  display: flex; gap: 0.65rem; align-items: flex-start;
  color: var(--ink-soft); font-size: 0.97rem; line-height: 1.5;
}
.paper-themes svg { color: var(--gold); flex: none; margin-top: 0.25rem; }

/* Citation box */
.paper-cite {
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  position: sticky;
  top: 92px;
}
.paper-cite h2 { font-size: 1.1rem; margin-bottom: 0.8rem; }
.paper-cite-text {
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--ink-soft);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 0.85rem;
  word-break: break-word;
}
.paper-cite-copy { margin-top: 0.8rem; width: 100%; }
.paper-cite dl { display: grid; gap: 0.55rem; margin: 1.1rem 0 0; }
.paper-cite dl > div {
  display: flex; justify-content: space-between; gap: 1rem;
  font-size: 0.88rem; border-bottom: 1px solid var(--border-soft); padding-bottom: 0.5rem;
}
.paper-cite dt { color: var(--ink-muted); }
.paper-cite dd { margin: 0; color: var(--ink); font-weight: 500; text-align: right; }

/* ---------- Inline document viewer ---------- */
.paper-viewer { padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 4rem); border-top: 1px solid var(--border-soft); }
.paper-viewer-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; margin-bottom: 1.4rem;
}
.paper-viewer-head h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
.paper-doc { display: grid; gap: 1.4rem; justify-items: center; }
.paper-sheet {
  position: relative;
  width: min(100%, 820px);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border-soft);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}
html[data-theme="light"] .paper-sheet { box-shadow: 0 12px 30px rgba(90, 70, 30, 0.16); }
.paper-sheet img { width: 100%; display: block; }
.paper-sheet-num {
  position: absolute; top: 0.7rem; right: 0.8rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(11, 16, 12, 0.62);
  color: #f3ecd9;
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
  backdrop-filter: blur(4px);
}

/* ---------- Papers index ---------- */
.papers-hero { text-align: center; padding-block: clamp(2rem, 6vw, 4rem) clamp(1.5rem, 4vw, 2.5rem); }
.papers-hero h1 { font-size: clamp(2.2rem, 5.5vw, 3.6rem); }
.papers-hero .lede { max-width: 58ch; margin: 1.1rem auto 0; color: var(--ink-soft); line-height: 1.7; }
.papers-list { display: grid; gap: 1.2rem; padding-bottom: clamp(2.5rem, 6vw, 4rem); }
.paper-card {
  display: grid;
  grid-template-columns: minmax(120px, 170px) 1fr;
  gap: clamp(1.1rem, 3vw, 2rem);
  align-items: center;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.2rem, 3vw, 1.8rem);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
  cursor: pointer;
}
.paper-card:hover { transform: translateY(-5px); border-color: var(--gold); box-shadow: var(--shadow); }
.paper-card:hover .paper-card-title { color: var(--gold-bright); }
.paper-card-thumb {
  border-radius: 4px; overflow: hidden; background: #fff;
  border: 1px solid var(--border-soft);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
}
.paper-card-thumb img { width: 100%; display: block; }
.paper-card-info { display: grid; gap: 0.6rem; justify-items: start; }
.paper-card-title { font-family: var(--font-display); font-size: clamp(1.35rem, 2.6vw, 1.9rem); font-weight: 600; color: var(--ink); margin: 0; line-height: 1.2; }
.paper-card-desc { color: var(--ink-soft); font-size: 0.95rem; max-width: 62ch; }
.paper-card-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.3rem; }

@media (max-width: 820px) {
  .paper-hero, .paper-body { grid-template-columns: 1fr; }
  .paper-cover { order: -1; max-width: 240px; margin-inline: auto; position: static; }
  .paper-hero-copy { justify-items: center; text-align: center; }
  .paper-lede { text-align: left; }
  .paper-themes li { text-align: left; }
  .paper-cite { position: static; }
}
@media (max-width: 560px) {
  .paper-card { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .paper-card-thumb { max-width: 160px; }
  .paper-card-info { justify-items: center; }
  .paper-card-desc { text-align: left; }
}