/* =========================
   Design System (from DESIGN.md)
   ========================= */
:root{
  --primary: #333;        /* Headers, text - darker for better contrast */
  --secondary: #0066cc;   /* Links, buttons - darker blue */
  --accent: #c9302c;      /* Active states */
  --gray-light: #f8f9fa;  /* Backgrounds */
  --gray-mid: #666;       /* Secondary text - darker */
  --gray-text: #495057;   /* Body text */

  --font-ui: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --font-latin: Georgia, 'Times New Roman', serif;

  --size-base: 16px;      /* UI elements - increased */
  --size-verse: 18px;     /* Latin text */
  --size-title: 24px;     /* Poem titles */

  --radius: 8px;
  --gap-1: 8px;
  --gap-2: 16px;
  --gap-3: 24px;
  --gap-4: 32px;
  --gap-5: 48px;

  --nav-h: 60px;
  --control-h: 36px;
}

/* ========== Base ========== */
* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin:0;
  color:var(--primary);
  background:#fff;
  font-family: var(--font-ui);
  font-size: var(--size-base);
  line-height: 1.6;  /* Increased for better readability */
}
h1,h2,h3,h4{ margin: 0 0 var(--gap-1); font-weight: 600; color: var(--primary); }
h3{ font-size: 18px; }
h4{ font-size: 16px; color: #243444; }
a { color: var(--secondary); text-decoration: none; }
a:hover { text-decoration: underline; }
button, select, input{
  font: inherit;
}
.sr-only{
  position:absolute !important;
  height:1px;width:1px;
  overflow:hidden;clip:rect(1px,1px,1px,1px);
  white-space:nowrap;
}

/* ========== Navigation Bar ========== */
.nav{
  position: sticky;
  top:0;
  z-index: 10;
  height: var(--nav-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--gap-2);
  padding: 0 var(--gap-2);
  background: var(--gray-light);
  border-bottom: 1px solid #e3e6ea;
}
.nav-left{
  display: flex;
  align-items: center;
  gap: var(--gap-2);
}
.nav-left .brand{
  font-weight: 700;
  font-size: 20px;
  white-space: nowrap;
}
.nav-link-btn{
  background: transparent;
  border: none;
  color: var(--primary);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
  transition: color 0.2s;
  text-decoration: none;
  display: inline-block;
}
.nav-link-btn:hover{
  color: var(--secondary);
  text-decoration: underline;
}
.nav-link-btn.active{
  color: var(--accent);
  font-weight: 600;
}
.nav-center{
  display: flex;
  justify-content: center;
}
.nav-right{
  display:flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--gap-1);
  min-width: 0;
}
.nav-select{
  height: var(--control-h);
  padding: 0 8px;
  border:1px solid #ced4da;
  border-radius: 6px;
  background:#fff;
  color: var(--primary);
  min-width: 140px;
}

/* Buttons */
.btn, .icon-btn, .view-toggle .toggle{
  height: var(--control-h);
  border: 1px solid transparent;
  padding: 0 12px;
  border-radius: 6px;
  cursor: pointer;
  background: var(--secondary);
  color:#fff;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  user-select:none;
}
.icon-btn{
  width: var(--control-h);
  padding:0;
}
.btn:hover, .icon-btn:hover{ filter: brightness(0.95); }
.btn:focus-visible, .icon-btn:focus-visible, .toggle:focus-visible{
  outline: 3px solid rgba(52,152,219,.4);
  outline-offset: 2px;
}

/* Segmented control */
.view-toggle{
  display:inline-flex;
  background:#fff;
  border:1px solid #d0d7de;
  border-radius: 999px;
  overflow: hidden;
}
.view-toggle .toggle{
  background: transparent;
  color: var(--primary);
  border-radius: 0;
  border: none;
  padding: 0 16px;
  min-width: 90px;
}
.view-toggle .toggle.active{
  background: var(--accent);
  color: #fff;
}

/* Search */
.searchbox{
  display:flex;
  align-items:center;
  gap: 8px;
  min-width: 0;
}
.search-input{
  height: var(--control-h);
  border:1px solid #ced4da;
  border-radius: 6px;
  padding: 0 10px;
  min-width: 160px;
  width: 100%;
  max-width: 260px;
}
.search-meta{
  display:flex;
  align-items:center;
  gap: 4px;
  color: var(--gray-mid);
}
.search-meta #searchCount{
  min-width: 24px;
  text-align: center;
  background:#fff;
  border:1px solid #ced4da;
  border-radius: 6px;
  padding: 0 6px;
}

/* ========== Layout ========== */
#layout{
  height: calc(100vh - var(--nav-h));
  display: grid;
  grid-template-columns: 1fr 1fr; /* desktop 50/50 */
  gap: 0;
}

/* Text Panel */
#textPanel{
  overflow: hidden;
  border-right:1px solid #e9ecef;
  background:#fff;
}
.text-view{
  height: 100%;
  overflow: auto;
  padding: var(--gap-3);
  display: none;
  scroll-behavior: smooth;
}
.text-view.active{ display: block; }

.poem{
  margin-bottom: var(--gap-5);
}
.poem-id{ font-size: 16px; color: var(--gray-mid); }
.poem-title{ font-size: var(--size-title); font-family: var(--font-latin); margin-bottom: var(--gap-2); }

/* Lines */
.couplet{ margin: 0 0 var(--gap-1); }
.line{
  display:flex;
  align-items: baseline;
  font-family: var(--font-latin);
  font-size: var(--size-verse);
}
.line + .line{ margin-top: 2px; }

.line .ln{
  width: 30px;            /* 30px width per spec */
  flex: 0 0 30px;
  text-align: right;      /* right-aligned */
  color: var(--gray-mid); /* gray */
  margin-right: 10px;
}
.line.hex .txt{ margin-left: 0; }     /* Hexameter: no indent */
.line.pent .txt{ margin-left: 40px; } /* Pentameter: 40px left indent */

/* Page breaks */
.page-break{
  display:block;
  text-align:center;
  color: var(--gray-mid);
  font-variant: small-caps;     /* small caps */
  margin: var(--gap-3) 0;
}

/* Commentary */
.commentary-view .note{
  border:1px solid #e6e9ed;
  border-radius: 8px;
  margin: 12px 0;
  background: #fcfdff;
}
.note .note-toggle{
  width: 100%;
  text-align: left;
  background: #f3f7fb;
  color: var(--primary);
  border: none;
  padding: 10px 12px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
}
.note .note-body{ display: none; padding: 10px 12px; }
.note.open .note-body{ display: block; }

/* Translation */
.translation-view h3{
  margin-bottom: 6px;
}
.translation-view p{
  margin: 6px 0 10px;
}

/* ========== Image Viewer ========== */
#imagePanel{
  position: sticky;
  top: var(--nav-h);
  height: calc(100vh - var(--nav-h));
  display:flex;
  flex-direction: column;
  background:#fff;
}
.image-controls{
  height: 48px;
  display:grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--gap-1);
  padding: 6px var(--gap-2);
  border-bottom:1px solid #e9ecef;
}
.image-controls .left,
.image-controls .center,
.image-controls .right{
  display:flex;
  align-items:center;
  gap: 6px;
}
.image-controls .center{
  justify-content: center;
  color: var(--gray-mid);
  font-weight: 600;
}

.image-stage{
  position: relative;
  flex: 1 1 auto;
  overflow: hidden;                 /* Fixed position viewport */
  background: #f6f8fa;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor: default;
}
.image-stage.panning{ cursor: grabbing; }
.image-stage img{
  max-width: 100%;
  max-height: 100%;
  transform-origin: 50% 50%;
  transition: transform 120ms ease;
  user-select: none;
  pointer-events: none; /* drag via stage */
}
.image-overlay{
  position:absolute;
  inset: 0;
  display:none;
  align-items:center;
  justify-content:center;
  color: var(--gray-mid);
  font-weight: 600;
}

/* Search highlight */
mark.hl{
  background: #ffe38f;
  padding: 0 2px;
  border-radius: 2px;
}
mark.hl.pulse{
  outline: 2px solid #f4c430;
}

/* Tooltip */
.tooltip{
  position: absolute;
  z-index: 1000;
  background: #111827;
  color:#fff;
  font-size: 12px;
  padding: 8px 10px;
  border-radius: 6px;
  box-shadow: 0 6px 16px rgba(0,0,0,.15);
  pointer-events: none;
}

/* ========== Critical Apparatus ========== */
/* Badge for navigation */
.badge {
  position: absolute;
  top: -4px;
  right: -8px;
  background: var(--accent);
  color: white;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}

/* Apparatus Panel */
.apparatus-panel {
  position: fixed;
  right: -400px;
  top: var(--nav-h);
  bottom: 0;
  width: 400px;
  background: white;
  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.1);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: right 0.3s ease;
}

.apparatus-panel.open {
  right: 0;
}

.apparatus-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--gap-2);
  border-bottom: 1px solid #e9ecef;
  background: var(--gray-light);
}

.apparatus-header h3 {
  margin: 0;
  font-size: 18px;
  color: var(--primary);
}

.apparatus-stats {
  padding: 12px var(--gap-2);
  background: #f8f9fa;
  border-bottom: 1px solid #e9ecef;
  color: var(--gray-mid);
  font-size: 14px;
}

.apparatus-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--gap-2);
}

.apparatus-section {
  margin-bottom: var(--gap-3);
}

.apparatus-poem-title {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #e9ecef;
}

.apparatus-entry {
  margin-bottom: 16px;
  padding: 12px;
  background: #f8f9fa;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.apparatus-entry:hover {
  background: #e9ecef;
  transform: translateX(-4px);
}

.apparatus-entry.active {
  background: #fff3cd;
  border: 1px solid #ffc107;
}

.apparatus-line {
  font-size: 12px;
  color: var(--gray-mid);
  margin-bottom: 4px;
  font-weight: 600;
}

.apparatus-content {
  font-size: 14px;
  line-height: 1.6;
}

.apparatus-lemma {
  font-weight: 600;
  color: var(--primary);
}

.apparatus-reading {
  font-style: italic;
  color: #495057;
}

/* Inline apparatus display */
.apparatus-inline {
  display: inline;
  position: relative;
}

.apparatus-lemma-inline {
  font-weight: 600;
  color: var(--primary);
  background: linear-gradient(180deg, transparent 70%, rgba(255, 234, 167, 0.5) 70%);
  padding: 0 2px;
}

.apparatus-bracket {
  color: #6c757d;
  font-size: 0.9em;
  margin: 0 2px;
}

.apparatus-wit {
  color: #6c757d;
  font-size: 0.85em;
  font-style: normal;
  font-weight: 500;
}

.apparatus-variant {
  font-style: italic;
  color: #c9302c;
  font-size: 0.95em;
}

/* Hover effect for the entire apparatus */
.apparatus-inline:hover .apparatus-lemma-inline {
  background: rgba(255, 234, 167, 0.8);
  padding: 2px 4px;
  border-radius: 3px;
}

/* Optional: Add a subtle animation */
.apparatus-inline {
  transition: all 0.2s ease;
}

/* For smaller screens, make the apparatus more compact */
@media (max-width: 767.98px) {
  .apparatus-variant,
  .apparatus-wit {
    font-size: 0.8em;
  }
}

/* Dialog */
#aboutDialog{
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.35);
  display:flex;
  align-items:center;
  justify-content:center;
  padding: var(--gap-3);
}
#aboutDialog[hidden]{ display: none; }
#aboutDialog .dialog-content{
  background: #fff;
  border-radius: 12px;
  max-width: 520px;
  width: 100%;
  padding: var(--gap-3);
  box-shadow: 0 10px 30px rgba(0,0,0,.2);
}

/* ========== Responsive Breakpoints ========== */
/* Mobile: < 768px */
@media (max-width: 767.98px){
  .apparatus-panel {
    width: 100%;
    right: -100%;
  }
  
  .apparatus-panel.open {
    right: 0;
  }
  :root{
    --control-h: 44px; /* Larger touch targets */
  }
  .nav{
    grid-template-columns: 1fr auto 1fr;
    gap: var(--gap-1);
  }
  .nav-right{
    gap: 6px;
  }
  #poemSelect{ display: none; } /* Hide poem selector */
  #layout{
    grid-template-columns: 1fr; /* stack vertically */
  }
  #imagePanel{
    order: 2; /* Image below text */
    position: static;
    height: auto;
  }
  .image-stage{
    max-height: 60vh;
  }
}

/* Tablet: 768–1024px (60/40 split) */
@media (min-width: 768px) and (max-width: 1023.98px){
  #layout{
    grid-template-columns: 3fr 2fr; /* ~60/40 */
  }
}

/* Desktop: > 1024px (50/50 split) */
@media (min-width: 1024px){
  #layout{
    grid-template-columns: 1fr 1fr; /* 50/50 */
  }
}

/* Subtle scrollbar styling (WebKit/Chromium) */
.text-view::-webkit-scrollbar{ width: 10px; }
.text-view::-webkit-scrollbar-thumb{ background: #d0d7de; border-radius: 8px; }
.text-view::-webkit-scrollbar-thumb:hover{ background: #b9c1c9; }