/* Papers page: search, topic chips and paper cards. Builds on research/research.css. */
.papers-tools {
  margin-bottom: 1rem;
}

.papers-tools input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: var(--surface, #fff);
  color: var(--ink);
  padding: 0.75rem 1rem;
  font: inherit;
}

.papers-tools input:focus-visible,
.paper-chip:focus-visible,
.paper-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.paper-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1rem;
}

.paper-chip {
  border: 1px solid #627d9873;
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  padding: 0.38rem 0.8rem;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 650;
  cursor: pointer;
}

.paper-chip[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--paper);
}

.paper-count {
  margin-bottom: 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.paper-card {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: var(--surface, #fff);
  padding: 1.4rem;
}

.paper-card:hover {
  border-color: var(--accent);
  color: inherit;
}

.paper-year {
  border-right: 1px solid var(--line);
  font-size: 1.4rem;
  font-weight: 700;
}

.paper-card .work-meta,
.paper-detail .work-meta {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.paper-card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.paper-authors,
.paper-summary {
  margin: 0 0 0.6rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.paper-note {
  color: var(--muted);
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.paper-tag {
  border-radius: 0.25rem;
  background: var(--link-soft, var(--mist));
  color: var(--accent);
  padding: 0.1rem 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
}

.paper-empty {
  padding: 2.5rem 0;
  color: var(--muted);
  text-align: center;
}

.paper-detail {
  max-width: 820px;
}

.paper-detail h1 {
  margin-bottom: 1rem;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.15;
}

.paper-back {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--accent);
  font-weight: 600;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.5rem 0;
}

.paper-button {
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  background: var(--surface, #fff);
  padding: 0.45rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 650;
}

.paper-button:hover {
  border-color: var(--accent);
}

.paper-takeaways {
  margin: 2rem 0;
  border-left: 3px solid var(--accent);
  background: var(--mist);
  padding: 1rem 1.4rem;
}

.paper-takeaways h2 {
  margin-bottom: 0.4rem;
  font-size: 1rem;
}

.paper-takeaways ul {
  margin: 0;
  padding-left: 1.2rem;
}

@media (max-width: 640px) {
  .paper-card {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.1rem;
  }

  .paper-year {
    border-right: 0;
    font-size: 1rem;
  }
}

.paper-added {
  align-self: center;
  color: var(--muted);
  font-size: 0.78rem;
}

.paper-notes {
  margin-top: 2rem;
}

.paper-notes h2 {
  margin: 2rem 0 0.6rem;
  font-size: 1.25rem;
}

.paper-notes pre {
  overflow-x: auto;
}

.paper-notes table {
  display: block;
  overflow-x: auto;
  margin: 1rem 0 1.25rem;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.paper-notes th,
.paper-notes td {
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}