:root {
  /* Vintage Archive Palette */
  --bg-paper: #fdf6e3;
  --bg-sidebar: #f8efd4;
  --bg-active: #eee8d5;
  --ink: #1a1a1a;
  --ink-muted: #586e75;
  --ink-soft: #93a1a1;
  --accent: #b58900;
  --accent-rgb: 181, 137, 0;
  --accent-deep: #856404;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.15);
  --shadow-dossier: 0 10px 30px rgba(0, 0, 0, 0.05);
  
  /* Typography */
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", -apple-system, sans-serif;
  --mono: "Menlo", "Monaco", "Consolas", "Courier New", monospace;
  
  /* Layout */
  --header-height: 120px;
  --footer-height: 64px;
  --sidebar-width: 380px;
  --radius: 4px;
}

body[data-project="bokor"] {
  --accent: #2aa198;
  --accent-rgb: 42, 161, 152;
}

body[data-project="kampot-rebellion-1885"] {
  --accent: #cb4b16;
  --accent-rgb: 203, 75, 22;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg-paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* --- Backdrop & Textures --- */
.backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

.paper-texture {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* --- Layout Shell --- */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.app-header {
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-strong);
  padding: 1rem;
}

.header-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.eyebrow {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.project-picker {
  background: transparent;
  border: none;
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
  padding: 0;
  cursor: pointer;
  outline: none;
}

.project-intro {
  margin-top: 1rem;
  max-width: 800px;
}

.project-intro p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.app-nav {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
}

.search-bar input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 99px;
  border: 1px solid var(--border-strong);
  background: var(--bg-paper);
  font-size: 0.95rem;
  outline: none;
}

.nav-filters {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: none;
}

.nav-filters::-webkit-scrollbar { display: none; }

.filter-pill {
  white-space: nowrap;
  padding: 0.5rem 1rem;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--bg-paper);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
}

.filter-pill.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* --- Main Content Area --- */
.app-main {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.app-sidebar {
  width: var(--sidebar-width);
  border-right: 1px solid var(--border-strong);
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-close-bar {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-strong);
  background: var(--bg-sidebar);
  flex-shrink: 0;
}

.sidebar-close-btn {
  background: transparent;
  border: none;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  cursor: pointer;
  padding: 0.25rem 0;
}

.sidebar-section {
  padding: 1rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.section-header h2 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: 0;
}

.count-badge {
  font-family: var(--mono);
  font-size: 0.75rem;
  background: var(--bg-paper);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* --- Timeline List --- */
.timeline-container {
  display: grid;
  gap: 1rem;
}

.era-header {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--accent);
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  padding: 1.5rem 0 0.5rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
  text-align: left;
}

.era-toggle {
  font-size: 0.6rem;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.era-label {
  flex: 1;
}

.era-count {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: normal;
  opacity: 0.6;
}

.era-group.collapsed .era-events {
  display: none;
}

.era-group.expanded .era-toggle {
  transform: rotate(90deg);
}

.timeline-card {
  background: var(--bg-paper);
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.timeline-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.timeline-card.active {
  background: var(--bg-active);
  border-color: var(--accent);
  box-shadow: inset 4px 0 0 var(--accent);
}

.card-date {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 0.25rem;
}

.card-title {
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  display: block;
}

.card-summary {
  font-size: 0.85rem;
  color: var(--ink-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- Tag Clouds --- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-item {
  background: var(--bg-paper);
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.tag-item:hover, .tag-item.active {
  background: var(--bg-active);
  border-color: var(--accent);
  color: var(--accent-deep);
}

/* --- Biography / Entity Dossier --- */
.bio-aliases {
  margin: 0.4rem 0 0;
  font-size: 0.85rem;
  color: var(--ink-muted);
  font-style: italic;
}

.tag-item.readonly {
  cursor: default;
  pointer-events: none;
}

/* --- Dossier Detail View --- */
.app-content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  background: var(--bg-paper);
}

.dossier-page {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  padding: 3rem;
  box-shadow: var(--shadow-dossier);
  border: 1px solid var(--border-strong);
  position: relative;
}

.dossier-page::before {
  content: "";
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 100px;
  height: 40px;
  border: 3px solid rgba(var(--accent-rgb), 0.3);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-weight: 900;
  color: rgba(var(--accent-rgb), 0.3);
  text-transform: uppercase;
  transform: rotate(15deg);
  pointer-events: none;
}

.dossier-header {
  border-bottom: 2px solid var(--ink);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.dossier-type {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: block;
  margin-bottom: 1rem;
}

.dossier-title {
  font-family: var(--serif);
  font-size: 2.5rem;
  line-height: 1.1;
  margin: 0;
  font-weight: 700;
}

.dossier-lead {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--ink-muted);
  margin: 1.5rem 0;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  background: var(--bg-sidebar);
  padding: 1.5rem;
  border-radius: 4px;
  margin-bottom: 2rem;
}

.meta-item label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.meta-item span {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.1rem;
}

.dossier-section {
  margin-top: 3rem;
}

.dossier-section h3 {
  font-family: var(--serif);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.dossier-body {
  font-family: var(--serif);
  font-size: 1.1rem;
  line-height: 1.8;
}

.evidence-list {
  display: grid;
  gap: 2rem;
}

.evidence-item {
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--accent);
}

.evidence-text {
  font-style: italic;
  margin-bottom: 1rem;
  display: block;
}

.evidence-source {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
}

/* --- Mobile Specifics --- */
.mobile-only {
  display: none;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  :root {
    --sidebar-width: 100%;
  }

  .app-sidebar {
    position: fixed;
    top: var(--header-height);
    bottom: var(--footer-height);
    z-index: 100;
    width: 100%;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

  .app-sidebar.active {
    transform: translateX(0);
  }

  .app-content {
    padding: 1rem;
  }

  .dossier-page {
    padding: 1.5rem;
  }

  .dossier-title {
    font-size: 1.8rem;
  }

  .mobile-only {
    display: block;
  }

  .app-footer {
    background: var(--bg-sidebar);
    border-top: 1px solid var(--border-strong);
    height: var(--footer-height);
    flex-shrink: 0;
  }

  .mobile-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    height: 100%;
  }

  .mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    gap: 4px;
    padding: 0;
  }

  .mobile-nav-item .icon { font-size: 1.2rem; }
  .mobile-nav-item .label { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; }

  .mobile-nav-item.active {
    color: var(--accent);
  }
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-strong);
  padding: 0.5rem;
  border-radius: 4px;
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .app-header {
    --header-height: auto;
  }
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-sidebar);
}
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}