.research-intro {
  margin-bottom: 32px;
}

.filter-bar {
  display: grid;
  grid-template-columns: 140px 140px minmax(220px, 1fr) auto auto;
  gap: 12px;
  margin-top: 20px;
  align-items: end;
}

.filter-bar label {
  display: grid;
  gap: 6px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
}

.filter-bar select,
.filter-bar input,
.filter-bar button {
  height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--text-main);
  font-size: 14px;
  padding: 0 12px;
}

.filter-bar input:focus,
.filter-bar select:focus {
  outline: none;
  border-color: var(--accent);
}

.filter-bar .checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 10px;
}

.filter-bar .checkbox input {
  width: 16px;
  height: 16px;
  margin: 0;
}

.filter-bar button {
  cursor: pointer;
  color: var(--text-strong);
  font-weight: 600;
}

.filter-status {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 14px;
}

.paper-group {
  margin-bottom: 36px;
}

.paper-group > h2 {
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.research-page .paper-list {
  grid-template-columns: 1fr;
  gap: 0;
}

.year-heading {
  margin: 28px 0 0;
  color: var(--text-strong);
  font-size: 16px;
}

.paper-item.is-hidden,
.paper-list.is-hidden,
.year-heading.is-hidden,
.paper-group.is-hidden {
  display: none;
}

@media (max-width: 920px) {
  .filter-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .filter-bar {
    grid-template-columns: 1fr;
  }

  .filter-bar .checkbox {
    padding-bottom: 0;
  }
}