.btfilter {
  color: #111827;
  font-family: Arial, sans-serif;
}

.btfilter *,
.btfilter *::before,
.btfilter *::after {
  box-sizing: border-box;
}

.btfilter__grid {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
}

.btfilter.year-right .btfilter__grid {
  grid-template-columns: minmax(0, 1fr) minmax(180px, 240px);
}

.btfilter.no-sidebar .btfilter__grid {
  grid-template-columns: minmax(0, 1fr);
}

.btfilter__sidebar,
.btfilter.topic-left .btfilter__tabs-wrap,
.btfilter.topic-right .btfilter__tabs-wrap {
  background: #f8f9fa;
  color: #111827;
  padding: 20px;
}

.btfilter__sidebar-title {
  color: #111827;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 14px;
}

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

.btfilter__year,
.btfilter__tab {
  appearance: none;
  background: transparent;
  border: 0;
  color: #222;
  cursor: pointer;
  font: inherit;
  line-height: 1.35;
  text-align: left;
}

.btfilter__year {
  border-left: 3px solid transparent;
  border-radius: 4px;
  display: block;
  font-weight: 500;
  margin: 0 0 5px;
  padding: 8px 16px;
  width: 100%;
}

.btfilter__year:hover,
.btfilter__year:focus-visible,
.btfilter__tab:hover,
.btfilter__tab:focus-visible {
  color: #d10000;
  outline: none;
}

.btfilter__year.is-active {
  background: rgba(209, 0, 0, 0.08);
  border-left-color: #d10000;
  color: #d10000;
  font-weight: 700;
}

.btfilter__main {
  min-width: 0;
  padding: 20px 0;
}

.btfilter__topic-layout {
  min-width: 0;
}

.btfilter.topic-left .btfilter__topic-layout,
.btfilter.topic-right .btfilter__topic-layout {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
}

.btfilter.topic-right .btfilter__topic-layout {
  grid-template-columns: minmax(0, 1fr) minmax(160px, 220px);
}

.btfilter__tabs-wrap {
  align-items: center;
  display: flex;
  gap: 8px;
  max-width: 100%;
  overflow: hidden;
  width: 100%;
}

.btfilter__tabs-viewport {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
}

.btfilter__tabs {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  margin-bottom: 20px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

.btfilter__tabs::-webkit-scrollbar {
  display: none;
}

.btfilter__tab {
  flex: 0 0 auto;
  padding: 5px 15px;
  white-space: nowrap;
}

.btfilter.topic-left .btfilter__tabs-wrap,
.btfilter.topic-right .btfilter__tabs-wrap {
  align-items: stretch;
  display: block;
}

.btfilter.topic-left .btfilter__tabs,
.btfilter.topic-right .btfilter__tabs {
  display: block;
  margin-bottom: 0;
  overflow: visible;
}

.btfilter.topic-left .btfilter__tab,
.btfilter.topic-right .btfilter__tab {
  display: block;
  padding: 8px 10px;
  white-space: normal;
  width: 100%;
}

.btfilter__tab.is-active {
  color: #d10000;
  font-weight: 700;
}

.btfilter__tab-nav {
  appearance: none;
  background: transparent;
  border: 0;
  box-shadow: none;
  color: #111827;
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 28px;
  line-height: 1;
  margin-bottom: 20px;
  padding: 0 6px;
}

.btfilter__tab-nav:disabled {
  color: #9a9a9a;
  cursor: not-allowed;
  opacity: 0.45;
}

.btfilter__tab-nav.is-hidden {
  pointer-events: none;
  visibility: hidden;
}

.btfilter.topic-left .btfilter__tab-nav,
.btfilter.topic-right .btfilter__tab-nav {
  display: none;
}

.btfilter__documents {
  background: #f8f9fa;
  border-radius: 8px;
  display: grid;
  gap: 12px;
  margin-top: 10px;
  padding: 20px;
}

.btfilter.panel-grid.columns-1 .btfilter__documents {
  grid-template-columns: 1fr;
}

.btfilter.panel-grid.columns-2 .btfilter__documents {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.btfilter.panel-grid.columns-3 .btfilter__documents {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.btfilter.panel-grid.columns-4 .btfilter__documents {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.btfilter.panel-list .btfilter__documents {
  grid-template-columns: 1fr;
}

.btfilter__document {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  min-width: 0;
  padding: 12px 14px;
}

.btfilter__document a {
  color: #000;
  overflow-wrap: anywhere;
  text-decoration: none;
}

.btfilter__document a:hover,
.btfilter__document a:focus-visible {
  text-decoration: underline;
}

.btfilter__empty,
.btfilter__credit {
  color: #4b5563;
  font-size: 13px;
  line-height: 1.5;
}

.btfilter__credit {
  margin: 14px 0 0;
}

.btfilter__credit a {
  color: #111827;
}

@media (max-width: 767px) {
  .btfilter__grid,
  .btfilter.year-right .btfilter__grid,
  .btfilter.topic-left .btfilter__topic-layout,
  .btfilter.topic-right .btfilter__topic-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .btfilter__main {
    padding-top: 0;
  }

  .btfilter.panel-grid .btfilter__documents {
    grid-template-columns: 1fr;
  }
}