/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f5f3ef;
  --color-surface: #ffffff;
  --color-text: #2c2c2c;
  --color-text-muted: #666;
  --color-primary: #303F9F;
  --color-primary-light: #5c6bc0;
  --color-primary-dark: #1a237e;
  --color-accent: #c62828;
  --color-border: #ddd;
  --color-badge-bg: #e8eaf6;
  --color-badge-text: #303F9F;
  --font-heading: 'Oswald', sans-serif;
  --font-body: 'Source Sans 3', 'Source Sans Pro', sans-serif;
  --max-width: 1280px;
  --sidebar-width: 300px;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.12);
  --transition: 0.2s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ===== Header ===== */
.site-header {
  background: var(--color-primary-dark);
  color: #fff;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #fff;
  text-decoration: none;
  font-family: var(--font-heading);
  flex-shrink: 0;
}

.site-logo:hover {
  color: #fff;
  text-decoration: none;
}

.logo-img {
  height: 36px;
  width: auto;
}

.header-logos {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.header-logos a {
  display: flex;
  align-items: center;
  opacity: 0.85;
  transition: opacity var(--transition);
}

.header-logos a:hover {
  opacity: 1;
  text-decoration: none;
}

.header-logos img {
  height: 28px;
  width: auto;
}

/* Nav Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  color: rgba(255,255,255,0.85) !important;
  cursor: pointer;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-primary-dark);
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow-hover);
  padding: 0.5rem 0;
  min-width: 180px;
  z-index: 200;
}

.nav-dropdown:hover .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 0.4rem 1rem;
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
  text-decoration: none;
}

.header-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.header-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.header-nav a:hover {
  color: #fff;
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* ===== Search Bar ===== */
.search-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1.5rem;
}

.search-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.search-input-wrap {
  flex: 1;
  position: relative;
}

.search-input-wrap svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  width: 18px;
  height: 18px;
}

#search-input {
  width: 100%;
  padding: 0.6rem 0.75rem 0.6rem 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: border-color var(--transition), box-shadow var(--transition);
}

#search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(48,63,159,0.1);
}

.result-count {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.btn-reset {
  padding: 0.5rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-reset:hover {
  background: var(--color-border);
  color: var(--color-text);
}

/* ===== Main Layout ===== */
.main-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  flex: 1;
  width: 100%;
}

/* ===== Sidebar / Facets ===== */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
}

.sidebar-toggle {
  display: none;
  width: 100%;
  padding: 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.facet-group {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
  overflow: hidden;
}

.facet-header {
  padding: 0.75rem 1rem;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.3px;
  background: var(--color-badge-bg);
  color: var(--color-primary-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.facet-header::after {
  content: '▾';
  font-size: 0.75rem;
  transition: transform var(--transition);
}

.facet-header.collapsed::after {
  transform: rotate(-90deg);
}

.facet-options {
  padding: 0.5rem 0.75rem;
  max-height: 280px;
  overflow-y: auto;
}

.facet-options.collapsed {
  display: none;
}

.facet-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.25rem;
  border-radius: 3px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background var(--transition);
}

.facet-option:hover {
  background: var(--color-badge-bg);
}

.facet-option input[type="checkbox"] {
  accent-color: var(--color-primary);
  cursor: pointer;
}

.facet-option .label {
  flex: 1;
}

.facet-option .count {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

/* ===== Edition List ===== */
.content-area {
  flex: 1;
  min-width: 0;
}

.edition-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.edition-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.25rem;
  transition: box-shadow var(--transition), transform var(--transition);
  cursor: pointer;
  border-left: 3px solid transparent;
}

.edition-card:hover {
  box-shadow: var(--shadow-hover);
  border-left-color: var(--color-primary);
}

.edition-card.expanded {
  border-left-color: var(--color-primary);
}

.edition-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.edition-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.3;
}

.edition-title a {
  color: var(--color-primary);
}

.edition-year {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  padding-top: 0.15rem;
}

.edition-meta {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.edition-url {
  font-size: 0.8rem;
  word-break: break-all;
}

.edition-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.badge-material {
  background: #e8eaf6;
  color: #283593;
}

.badge-subject {
  background: #e0f2f1;
  color: #00695c;
}

.badge-language {
  background: #fff3e0;
  color: #e65100;
}

.badge-era {
  background: #fce4ec;
  color: #880e4f;
}

/* ===== Edition Detail (expanded) ===== */
.edition-detail {
  display: none;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

.edition-card.expanded .edition-detail {
  display: block;
}

.edition-description {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.edition-edition-info {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  font-style: italic;
}

.edition-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.edition-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.75rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  font-size: 0.8rem;
  transition: background var(--transition);
}

.edition-links a:hover {
  background: var(--color-primary-dark);
  color: #fff;
  text-decoration: none;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 1.5rem;
  margin-top: auto;
  font-size: 0.85rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-inner a {
  color: rgba(255,255,255,0.85);
}

.footer-inner a:hover {
  color: #fff;
}

/* ===== Loading ===== */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-muted);
}

.loading-spinner {
  display: inline-block;
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 0.75rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: var(--shadow-hover);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* ===== No results ===== */
.no-results {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-muted);
}

.no-results h3 {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

/* ===== Active Filters Display ===== */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.active-filters:empty {
  display: none;
}

.filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  background: var(--color-badge-bg);
  color: var(--color-primary-dark);
  border-radius: var(--radius);
  font-size: 0.78rem;
  cursor: pointer;
  transition: background var(--transition);
}

.filter-tag:hover {
  background: #c5cae9;
}

.filter-tag .remove {
  font-weight: bold;
  font-size: 0.9rem;
  line-height: 1;
}

/* ===== Info Icon (Edenda tooltips) ===== */
.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.6rem;
  font-weight: 700;
  font-style: normal;
  cursor: help;
  position: relative;
  flex-shrink: 0;
  line-height: 1;
  vertical-align: super;
  margin-left: 2px;
}

.info-icon::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: #fff;
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 400;
  white-space: normal;
  width: max-content;
  max-width: 240px;
  line-height: 1.4;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, visibility 0.15s ease;
  z-index: 300;
  text-align: left;
}

.info-icon:hover::after {
  opacity: 1;
  visibility: visible;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .main-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .sidebar-toggle {
    display: block;
  }

  .sidebar-content.hidden {
    display: none;
  }

  .header-nav {
    display: none;
  }

  .header-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--color-primary-dark);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-hover);
    border-radius: 0 0 var(--radius) var(--radius);
  }

  .menu-toggle {
    display: block;
  }

  .header-logos {
    display: none;
  }
}

@media (max-width: 600px) {
  .header-inner {
    padding: 0.5rem 1rem;
  }

  .logo-img {
    height: 26px;
  }

  .main-container {
    padding: 0.75rem;
  }

  .edition-card {
    padding: 0.75rem 1rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== Scrollbar ===== */
.facet-options::-webkit-scrollbar {
  width: 6px;
}

.facet-options::-webkit-scrollbar-track {
  background: transparent;
}

.facet-options::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem 0;
}

.pagination button {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.85rem;
  transition: all var(--transition);
}

.pagination button:hover:not(:disabled) {
  background: var(--color-badge-bg);
  border-color: var(--color-primary);
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination button.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.pagination .page-info {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}