body {
  margin: 0;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
}

/* Layout ratios: header 2/5, main 3/5, footer 1/5 */
header {
  flex: 1;
  min-height: 0;
}

main {
  flex: 4;
  min-height: 0;
}

footer {
  flex: 1;
  min-height: 0;
}

header, main, footer {
  padding: 1rem;
  margin: 0;
  border-radius: 40px;
}

header {
  font-family: "police1", sans-serif;
  background: #9557b5ff;
  color: white;
  display: flex;
  gap: 4%;
  padding: 1.5rem 3rem;
  align-items: center;
  overflow-y: auto;
  box-sizing: border-box;
}

header .title {
  color: white;
  font-size: 1.75rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

header section {
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.4;
}

header section p {
  margin: 0.5rem 0;
}

header section p:first-child {
  font-size: 1rem;
  font-weight: 600;
}

header section p:not(:first-child) {
  font-size: 0.85rem;
  opacity: 0.95;
}

header nav {
  display: flex;
  gap: 0.75rem;
}

header nav button {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
  font-family: inherit;
}

header nav button:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

header nav a {
  color: white;
  text-decoration: none;
}

/* Filter info banner */
.filter-info {
  background: rgba(149, 87, 181, 0.9);
  color: white;
  padding: 0.5rem 1rem;
  text-align: center;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.clear-filter {
  color: white;
  text-decoration: none;
  padding: 0.25rem 0.75rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 15px;
  font-size: 0.85rem;
  transition: background 0.2s;
}

.clear-filter:hover {
  background: rgba(0, 0, 0, 0.4);
}

main {
  background: #3c856bff;
  display: grid;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  grid-auto-flow: column;
  grid-auto-columns: 260px;
  gap: 1rem;
  padding: 1rem;
  box-sizing: border-box;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.card {
  background: #eee;
  border-radius: 10px;
  padding: 1rem;
  scroll-snap-align: start;
  height: 100%;
  box-sizing: border-box;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.card .title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.3;
  color: #333;
}

.card .authors {
  font-size: 0.9rem;
  margin: 0;
  color: #666;
}

.card .year {
  font-size: 0.85rem;
  margin: 0;
  color: #9557b5;
  font-weight: 600;
}

footer {
  background: #222222ff;
  overflow: hidden;
  box-sizing: border-box;
}

/* Years navigation in footer */
.years-nav {
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 1rem;
}

.years-scroll {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  padding: 0.75rem 0;
  width: 100%;
}

/* Hide scrollbar but keep functionality */
.years-scroll::-webkit-scrollbar {
  height: 4px;
}

.years-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.years-scroll::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
}

.year-link {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  white-space: nowrap;
  transition: background 0.2s;
  font-size: 1rem;
}

.year-link:hover {
  background: rgba(255, 255, 255, 0.1);
}

.year-link.active {
  background: #9557b5ff;
  font-weight: bold;
}

/* Pagination controls */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  margin: 1rem auto;
  width: fit-content;
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  height: 2.5rem;
  padding: 0 0.75rem;
  background: rgba(255, 255, 255, 0.9);
  color: #3c856b;
  text-decoration: none;
  border-radius: 6px;
  font-size: 1.2rem;
  font-weight: 600;
  transition: all 0.2s;
  border: 2px solid transparent;
}

.pagination-btn:hover:not(.disabled) {
  background: white;
  border-color: #9557b5;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.pagination-btn.disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

.pagination-info {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0 1rem;
  color: white;
  font-size: 1rem;
  font-weight: 500;
}

.page-current {
  font-size: 1.25rem;
  font-weight: 700;
  color: #9557b5;
  background: white;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  min-width: 2rem;
  text-align: center;
}

.page-separator {
  font-weight: 300;
  opacity: 0.6;
  padding: 0 0.25rem;
}

.page-total {
  opacity: 0.8;
}