/* ==========================================================================
   Ruhani Khazain WebApp - Production Stylesheet
   Specialized for RTL Urdu/Arabic, Nastaliq Typography & Multi-Device Support
   ========================================================================== */

:root {
  /* Design Tokens - Color Palette */
  --primary-color: #0D3B2E;
  --primary-light: #185E4B;
  --primary-dark: #07231B;
  --primary-hover: #134B3B;
  --accent-color: #C29B38;
  --accent-light: #E0BA5A;
  
  --bg-color: #FAF6E9;
  --surface-color: #FFFFFF;
  --surface-raised: #FDFBF7;
  --surface-border: #E8DFD0;
  --text-main: #2C2213;
  --text-muted: #6B5E4F;
  --text-inverse: #FFFFFF;

  --highlight-yellow: #FFF176;
  --highlight-rose: #FF80AB;
  --highlight-cyan: #80D8FF;
  --highlight-green: #CCFF90;
  --highlight-purple: #EA80FC;

  --badge-bg: #EAE3D2;
  --badge-text: #4A3B2C;
  --error-color: #C62828;
  --success-color: #2E7D32;

  /* Typography & Sizing */
  --reader-font-size: 24px;
  --reader-line-height: 2.2;
  --font-nastaliq: 'Noto Nastaliq Urdu', 'Jameel Noori Nastaleeq', 'Urdu Typesetting', serif;
  --font-scheherazade: 'Scheherazade New', 'Amiri', serif;
  --font-amiri: 'Amiri', 'Traditional Arabic', serif;
  --font-noto-sans: 'Noto Sans Arabic', system-ui, sans-serif;
  --font-body: var(--font-nastaliq);

  /* Layout Constants */
  --header-height: 64px;
  --sidebar-width: 320px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --shadow-sm: 0 2px 6px rgba(0,0,0,0.06);
  --shadow-md: 0 6px 18px rgba(0,0,0,0.09);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.14);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------------- Themes ---------------- */
body.theme-clean {
  --bg-color: #F8F9FA;
  --surface-color: #FFFFFF;
  --surface-raised: #FFFFFF;
  --surface-border: #E5E7EB;
  --text-main: #1F2937;
  --text-muted: #6B7280;
  --badge-bg: #F3F4F6;
  --badge-text: #374151;
}

body.theme-sepia {
  --bg-color: #F4ECD8;
  --surface-color: #FCF8EE;
  --surface-raised: #F9F2E2;
  --surface-border: #DECFAF;
  --text-main: #3D3020;
  --text-muted: #7A664D;
  --badge-bg: #E8DCC2;
  --badge-text: #4E3C25;
}

body.theme-night {
  --bg-color: #121212;
  --surface-color: #1E1E1E;
  --surface-raised: #282828;
  --surface-border: #333333;
  --text-main: #E2E8F0;
  --text-muted: #94A3B8;
  --badge-bg: #2D3748;
  --badge-text: #CBD5E1;
  --primary-color: #1E4E3F;
  --primary-light: #2A6E58;
}

body.theme-emerald {
  --bg-color: #0D2818;
  --surface-color: #143A24;
  --surface-raised: #1C4D31;
  --surface-border: #235D3C;
  --text-main: #D8F3DC;
  --text-muted: #95D5B2;
  --badge-bg: #205737;
  --badge-text: #D8F3DC;
  --accent-color: #74C69D;
}

/* ---------------- Font Families ---------------- */
body.font-nastaliq { --font-body: var(--font-nastaliq); }
body.font-noto-nastaliq { --font-body: 'Noto Nastaliq Urdu', serif; }
body.font-scheherazade { --font-body: var(--font-scheherazade); }
body.font-amiri { --font-body: var(--font-amiri); }
body.font-noto-sans { --font-body: var(--font-noto-sans); }

.font-nastaliq { font-family: var(--font-nastaliq); }
.font-noto-nastaliq { font-family: 'Noto Nastaliq Urdu', serif; }
.font-scheherazade { font-family: var(--font-scheherazade); }
.font-amiri { font-family: var(--font-amiri); }
.font-noto-sans { font-family: var(--font-noto-sans); }

/* ---------------- Global Reset & Typography ---------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  direction: rtl;
  text-align: right;
  font-family: var(--font-body);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
  user-select: none;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
}

/* ---------------- Header ---------------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--primary-color);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-titles .brand-title {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.1;
  color: #FFF;
  letter-spacing: -0.2px;
}

.brand-titles .brand-subtitle {
  font-size: 0.75rem;
  opacity: 0.85;
  display: block;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 100%;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.92rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-tab .material-symbols-outlined {
  font-size: 20px;
}

.nav-tab:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: #FFF;
}

.nav-tab.active {
  background-color: var(--accent-color);
  color: #111;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-timer {
  background: rgba(255, 255, 255, 0.12);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #FFF;
}

.header-timer .material-symbols-outlined {
  font-size: 18px;
  color: var(--accent-light);
}

.btn-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-icon:hover {
  background-color: rgba(255, 255, 255, 0.14);
}

.btn-icon:active {
  transform: scale(0.94);
}

.btn-icon-sm {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  transition: background-color var(--transition-fast);
}

.btn-icon-sm:hover {
  background-color: rgba(0, 0, 0, 0.08);
}

/* ---------------- Sidebar Drawer ---------------- */
.sidebar-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  width: var(--sidebar-width);
  background-color: var(--surface-color);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.sidebar-drawer.open {
  transform: translateX(0);
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 190;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.sidebar-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-header {
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--surface-border);
  background-color: var(--primary-color);
  color: #FFF;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  font-size: 28px;
  color: var(--accent-light);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-section h4 {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 700;
}

.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-link, .sidebar-action-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--text-main);
  width: 100%;
  text-align: right;
  transition: all var(--transition-fast);
}

.sidebar-link:hover, .sidebar-action-btn:hover {
  background-color: var(--badge-bg);
}

.sidebar-link.active {
  background-color: var(--primary-color);
  color: #FFF;
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--surface-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #9E9E9E;
}

.status-dot.active {
  background-color: #4CAF50;
  box-shadow: 0 0 6px #4CAF50;
}

.version-text {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ---------------- View Panes ---------------- */
.app-main {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px;
}

.view-pane {
  display: none;
}

.view-pane.active {
  display: block;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------------- Search View ---------------- */
.search-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.search-hero {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  background-color: var(--surface-raised);
  border: 2px solid var(--primary-light);
  border-radius: var(--radius-pill);
  padding: 4px 8px 4px 6px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input-wrapper:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(194, 155, 56, 0.2);
}

.search-icon {
  margin: 0 12px;
  color: var(--primary-color);
  font-size: 26px;
}

.search-input {
  flex: 1;
  font-size: 1.15rem;
  padding: 10px 4px;
}

.clear-btn {
  color: var(--text-muted);
}

.btn-primary {
  background-color: var(--primary-color);
  color: #FFF;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: var(--surface-raised);
  color: var(--text-main);
  border: 1px solid var(--surface-border);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background-color: var(--badge-bg);
}

.btn-danger {
  background-color: #FFEBEE;
  color: var(--error-color);
  border: 1px solid #FFCDD2;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-danger:hover {
  background-color: #FFCDD2;
}

.btn-outline {
  border: 1px solid var(--surface-border);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-outline:hover {
  background-color: var(--badge-bg);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

/* Urdu Char Bar */
.urdu-char-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  font-size: 0.88rem;
}

.char-bar-label {
  color: var(--text-muted);
  font-size: 0.8rem;
  white-space: nowrap;
}

.urdu-char-btn {
  background-color: var(--badge-bg);
  color: var(--badge-text);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  white-space: nowrap;
  transition: background-color var(--transition-fast);
}

.urdu-char-btn:hover {
  background-color: var(--accent-light);
  color: #000;
}

/* Search Modes & Options */
.search-modes-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  border-top: 1px dashed var(--surface-border);
  padding-top: 14px;
}

.modes-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.mode-chips {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.chip-label input {
  display: none;
}

.chip-label .chip {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip-label input:checked + .chip {
  background-color: var(--primary-color);
  color: #FFF;
  border-color: var(--primary-color);
  font-weight: 600;
}

.search-options-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  cursor: pointer;
}

.btn-filter-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  color: var(--primary-color);
  font-weight: 600;
}

.filter-count-badge {
  background-color: var(--accent-color);
  color: #000;
  font-size: 0.75rem;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  font-weight: 700;
}

/* Expandable Filters Drawer */
.filters-drawer {
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.filter-drawer-header h3 {
  font-size: 1rem;
  color: var(--primary-color);
}

.filter-quick-actions {
  display: flex;
  gap: 12px;
}

.btn-text {
  color: var(--primary-light);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: underline;
}

.collection-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.collection-pill-btn {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  font-size: 0.88rem;
  cursor: pointer;
}

.collection-pill-btn.active {
  background-color: var(--primary-color);
  color: #FFF;
  border-color: var(--primary-color);
  font-weight: 600;
}

.volumes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
  gap: 6px;
  margin-top: 6px;
}

.vol-check-btn {
  padding: 6px 4px;
  border-radius: var(--radius-sm);
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  font-size: 0.85rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.vol-check-btn.selected {
  background-color: var(--primary-light);
  color: #FFF;
  border-color: var(--primary-light);
  font-weight: 700;
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-border);
  background-color: var(--surface-color);
  color: var(--text-main);
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--primary-color);
  outline: none;
}

/* Topic Suggestions */
.topic-suggestions-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-top: 8px;
  border-top: 1px solid var(--surface-border);
}

.suggestions-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-color);
  white-space: nowrap;
}

.suggestions-chips {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
}

.topic-suggestion-btn {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.85rem;
  white-space: nowrap;
  transition: background-color var(--transition-fast);
}

.topic-suggestion-btn:hover {
  background-color: var(--accent-color);
  color: #000;
}

/* Morphology Analysis Card */
.morphology-card {
  background: linear-gradient(135deg, rgba(13, 59, 46, 0.06), rgba(194, 155, 56, 0.1));
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
}

.morphology-header {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.morphology-body {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.root-pill {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
}

/* Results Section */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
}

.results-count {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary-color);
}

.results-query-badge {
  font-size: 0.85rem;
  background-color: var(--badge-bg);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  margin-right: 8px;
}

.results-tools {
  display: flex;
  gap: 8px;
}

.book-aggregations {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 0;
}

.book-aggr-chip {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  font-size: 0.82rem;
}

/* Results Cards */
.results-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.result-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

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

.result-badges {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.result-book-badge {
  background-color: var(--primary-color);
  color: #FFF;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
}

.result-vol-badge {
  background-color: var(--accent-color);
  color: #111;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 700;
}

.result-ref-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.result-snippet {
  font-size: 1.12rem;
  line-height: 2.1;
  color: var(--text-main);
  text-align: justify;
}

.result-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  border-top: 1px solid var(--surface-border);
  padding-top: 8px;
}

.highlight-term {
  background-color: var(--highlight-yellow);
  color: #000;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 3px;
}

/* Welcome state */
.search-welcome-state {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 800px;
  margin: 20px auto;
}

.welcome-icon-wrap {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: var(--badge-bg);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.welcome-icon-wrap .material-symbols-outlined {
  font-size: 40px;
}

.search-welcome-state h2 {
  font-size: 1.6rem;
  color: var(--primary-color);
}

.search-welcome-state p {
  color: var(--text-muted);
  max-width: 600px;
  font-size: 1.05rem;
  line-height: 1.9;
}

.quick-stats-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 12px;
}

.stat-pill {
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-lbl {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.results-pagination {
  display: flex;
  justify-content: center;
  padding: 20px 0;
}

/* ---------------- Reader View ---------------- */
.reader-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.reader-toolbar {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}

.reader-nav-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-location-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--surface-raised);
  padding: 4px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-border);
}

.reader-select {
  font-weight: 600;
  font-size: 0.95rem;
  max-width: 140px;
}

.page-input-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
}

.reader-page-input {
  width: 54px;
  text-align: center;
  background: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 2px 4px;
  font-weight: 700;
}

.reader-book-meta {
  text-align: center;
  flex: 1;
}

.reader-book-title {
  font-size: 1.25rem;
  color: var(--primary-color);
  font-weight: 700;
}

.reader-ref-badge {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.reader-utility-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.view-mode-pill {
  display: flex;
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-pill);
  padding: 2px;
}

.view-pill-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.view-pill-btn.active {
  background-color: var(--primary-color);
  color: #FFF;
  font-weight: 600;
}

/* TTS Subbar */
.tts-subbar {
  background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
  color: #FFF;
  border-radius: var(--radius-md);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: fadeIn 0.2s ease-out;
}

.tts-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.tts-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tts-speed-selector {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.82rem;
}

.tts-speed-selector select {
  background: rgba(255, 255, 255, 0.2);
  color: #FFF;
  border-radius: var(--radius-sm);
  padding: 2px 4px;
}

/* Reader Canvas Layout */
.reader-canvas-layout {
  display: flex;
  gap: 20px;
  width: 100%;
}

.reader-text-pane {
  flex: 1;
  min-width: 0;
}

.reader-page-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px 48px;
  box-shadow: var(--shadow-sm);
  min-height: 600px;
  display: flex;
  flex-direction: column;
}

.page-top-margin, .page-bottom-margin {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.88rem;
  border-bottom: 1px solid var(--surface-border);
  padding-bottom: 12px;
  margin-bottom: 24px;
}

.page-bottom-margin {
  border-bottom: none;
  border-top: 1px solid var(--surface-border);
  padding-top: 12px;
  margin-top: 32px;
  margin-bottom: 0;
  justify-content: center;
}

.reader-article {
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  color: var(--text-main);
  text-align: justify;
  text-justify: inter-word;
  user-select: text;
  flex: 1;
  letter-spacing: 0.2px;
}

/* Scanned Image Pane */
.reader-image-pane {
  flex: 1;
  min-width: 0;
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.scan-image-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: #FAFAFA;
  border-radius: var(--radius-md);
}

.scan-controls-overlay {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.7);
  color: #FFF;
  border-radius: var(--radius-pill);
  padding: 4px 8px;
  display: flex;
  gap: 4px;
  z-index: 10;
}

.scan-img-container {
  max-height: 700px;
  overflow: auto;
  display: flex;
  justify-content: center;
}

.scan-page-image {
  max-width: 100%;
  height: auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  border-radius: 4px;
}

.scan-spinner {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

/* Reader Bottom Fast Navigation */
.reader-bottom-nav {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.reader-slider-wrap {
  flex: 1;
}

.reader-slider, .form-range {
  width: 100%;
  accent-color: var(--primary-color);
  cursor: pointer;
}

/* ---------------- Dual-Pane Split View ---------------- */
.dual-reader-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dual-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
}

.dual-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dual-panes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.dual-pane {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  min-height: 600px;
}

.dual-pane-toolbar {
  padding: 10px 14px;
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--surface-raised);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.dual-page-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.dual-page-input {
  width: 48px;
  text-align: center;
  background: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
}

.dual-pane-content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  max-height: 700px;
  font-size: 1.15rem;
  line-height: 2.1;
  text-align: justify;
}

/* ---------------- Generic Section Views ---------------- */
.generic-sub-container, .bookmarks-container, .notebook-container, .downloads-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-top-header {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title-wrap h2 {
  font-size: 1.35rem;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title-wrap p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.section-top-actions {
  display: flex;
  gap: 8px;
}

.bookmarks-tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-chip {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  font-size: 0.88rem;
  cursor: pointer;
}

.tag-chip.active {
  background-color: var(--primary-color);
  color: #FFF;
  font-weight: 600;
}

.bookmarks-search-box {
  display: flex;
  align-items: center;
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  gap: 8px;
}

.bookmarks-search-box input {
  flex: 1;
}

.bookmarks-list, .notebook-grid, .read-later-list, .history-list, .topics-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bookmark-card, .note-card, .topic-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bookmark-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bookmark-tag-badge {
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  color: #FFF;
  font-weight: 700;
}

/* ---------------- Downloads / Collections View ---------------- */
.storage-summary-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.storage-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.storage-lbl {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.storage-val {
  font-size: 1.15rem;
  font-weight: 700;
}

.storage-val.success { color: var(--success-color); }
.storage-val.highlight { color: var(--primary-color); }

.collections-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.collection-db-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.collection-db-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.coll-title {
  font-size: 1.25rem;
  color: var(--primary-color);
  font-weight: 700;
}

.coll-author {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.coll-desc {
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.6;
}

.coll-progress-wrap {
  margin-top: 4px;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: var(--badge-bg);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.coll-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  border-top: 1px solid var(--surface-border);
  padding-top: 12px;
}

/* ---------------- Floating Controls ---------------- */
.floating-reader-nav {
  position: fixed;
  bottom: 24px;
  left: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 90;
}

.fab-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: #FFF;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.fab-btn:hover {
  background-color: var(--primary-hover);
  transform: scale(1.08);
}

/* ---------------- Modals & Dialogs ---------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.2s ease-out;
}

.modal-backdrop.hidden {
  display: none !important;
}

.modal-card {
  background-color: var(--surface-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 620px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-color);
}

.modal-title h3 {
  font-size: 1.15rem;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--surface-border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Citation format tabs */
.citation-format-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.cit-tab {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  font-size: 0.8rem;
}

.cit-tab.active {
  background-color: var(--primary-color);
  color: #FFF;
}

.citation-text-area {
  background-color: var(--surface-raised);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 1.1rem;
  line-height: 1.9;
  min-height: 80px;
}

.citation-fields-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* Typography settings */
.settings-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-label {
  font-size: 0.9rem;
  font-weight: 600;
}

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

.slider-badge {
  background: var(--badge-bg);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
}

.font-selection-grid, .theme-selection-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.font-option-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.font-option-card.active {
  border-color: var(--primary-color);
  background-color: var(--badge-bg);
}

.theme-selection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
}

.theme-color-btn {
  padding: 10px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 24px;
  right: 50%;
  transform: translateX(50%);
  background-color: var(--primary-dark);
  color: #FFF;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 400;
  font-size: 0.92rem;
  font-weight: 500;
  animation: toastUp 0.3s ease-out;
}

@keyframes toastUp {
  from { opacity: 0; transform: translate(50%, 20px); }
  to { opacity: 1; transform: translate(50%, 0); }
}

.hidden {
  display: none !important;
}

.spin {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

/* ---------------- Local File Import & Dropzone Styles ---------------- */
.local-file-import-card {
  background: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.import-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}

.import-card-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.import-card-title .material-symbols-outlined {
  font-size: 32px;
  color: var(--primary-light);
}

.import-card-title h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.import-card-title p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.import-coll-select-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-select-sm {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--surface-border);
  background: var(--bg-color);
  font-size: 0.88rem;
  font-weight: 500;
}

.dropzone-area {
  border: 2px dashed var(--surface-border);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  background: var(--surface-raised);
  transition: all var(--transition-fast);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.dropzone-area:hover, .dropzone-area.drag-over {
  border-color: var(--primary-color);
  background: var(--badge-bg);
}

.dropzone-icon {
  font-size: 48px;
  color: var(--primary-light);
}

.dropzone-area h4 {
  font-size: 1.05rem;
  font-weight: 600;
}

.dropzone-area p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* ---------------- Fetch Error Recovery Dialog Styles ---------------- */
.fetch-error-msg-box {
  background: #FFEBEE;
  border: 1px solid #FFCDD2;
  color: #B71C1C;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  line-height: 1.7;
}

body.theme-night .fetch-error-msg-box,
body.theme-emerald .fetch-error-msg-box {
  background: #3E1010;
  border-color: #5C1D1D;
  color: #FFCDD2;
}

.fetch-error-msg-box code {
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  direction: ltr;
  display: inline-block;
}

.error-solutions-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.error-solution-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  background: var(--surface-raised);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

.error-solution-card:hover {
  border-color: var(--primary-light);
}

.sol-icon {
  font-size: 28px;
  color: var(--primary-light);
  flex-shrink: 0;
}

.sol-info {
  flex: 1;
}

.sol-info h4 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.sol-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.error-solution-card .btn-primary,
.error-solution-card .btn-secondary {
  flex-shrink: 0;
  white-space: nowrap;
}

/* ---------------- Responsive Styles ---------------- */
@media (max-width: 900px) {
  .header-nav {
    display: none;
  }

  .dual-panes-grid {
    grid-template-columns: 1fr;
  }

  .reader-canvas-layout {
    flex-direction: column;
  }

  .reader-page-card {
    padding: 24px 18px;
  }

  .app-main {
    padding: 12px 8px;
  }
}

/* ---------------- Print Media Styles (PDF Export) ---------------- */
@media print {
  body {
    background: #FFF !important;
    color: #000 !important;
    font-size: 14pt;
  }

  .app-header, .sidebar-drawer, .reader-toolbar, .reader-bottom-nav, .floating-reader-nav, .search-hero, .results-tools, .modal-backdrop {
    display: none !important;
  }

  .reader-page-card {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }

  .reader-article {
    line-height: 2.0 !important;
  }
}