/* ==========================================================================
   PDF Page Studio - Editorial Creamy Luxury Design System
   Full Mobile/Tablet Responsiveness • Touch Optimization • Physics Spring Motion
   ========================================================================== */

:root {
  /* Editorial Creamy Color Architecture */
  --bg-main: #fbfaf7;               /* Warm Alabaster Cream Linen */
  --bg-surface: #ffffff;            /* Fine Crisp Paper Card */
  --bg-surface-elevated: #f4efe6;   /* Warm Oat / Soft Linen */
  --bg-surface-hover: #ebe4d5;      /* Warm Butter Cream */
  --bg-surface-active: #e2dac9;

  --border-subtle: #e6dfd3;         /* Delicate Warm Stone Border */
  --border-strong: #d5cbbe;         /* Structural Border */
  --border-focus: #c2410c;          /* Warm Terracotta Cognac */

  --text-primary: #1c1917;          /* Deep Roasted Espresso Charcoal (WCAG AAA) */
  --text-secondary: #57534e;        /* Warm Stone Graphite */
  --text-muted: #857e75;            /* Warm Granite */

  --accent-terracotta: #c2410c;     /* Artisanal Terracotta Accent */
  --accent-terracotta-hover: #9a3412;
  --accent-terracotta-glow: rgba(194, 65, 12, 0.18);

  --accent-amber: #d97706;          /* Golden Honey Accent */
  --accent-danger: #dc2626;         /* Refined Crimson */
  --accent-danger-bg: rgba(220, 38, 38, 0.08);

  --badge-bg: #1c1917;              /* Deep Espresso */
  --badge-text: #fbfaf7;            /* Warm Cream */

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  /* Typography Stack */
  --font-display: 'Syne', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Physics-Based Spring Timing Functions */
  --spring-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --spring-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --spring-micro: cubic-bezier(0.2, 0, 0, 1);

  /* Delicate Warm Ambient Shadows */
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.05);
  --shadow-card: 0 1px 3px rgba(28, 25, 23, 0.04), 0 6px 18px -2px rgba(28, 25, 23, 0.06);
  --shadow-card-hover: 0 4px 8px -1px rgba(28, 25, 23, 0.06), 0 20px 36px -6px rgba(28, 25, 23, 0.12);
  --shadow-elevated: 0 12px 36px -4px rgba(28, 25, 23, 0.14), 0 4px 12px -2px rgba(28, 25, 23, 0.06);
  --shadow-drag: 0 24px 48px -8px rgba(28, 25, 23, 0.22), 0 0 0 2px var(--accent-terracotta);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Layout & Container
   -------------------------------------------------------------------------- */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-main);
}

/* --------------------------------------------------------------------------
   Top Navigation Header
   -------------------------------------------------------------------------- */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background-color: rgba(251, 250, 247, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 40;
  gap: 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  border-radius: var(--radius-sm);
}

.brand-section:focus-visible {
  outline: 2px solid var(--accent-terracotta);
  outline-offset: 4px;
}

.brand-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--accent-terracotta);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--spring-bounce);
  flex-shrink: 0;
}

.brand-section:hover .brand-logo {
  transform: rotate(-4deg) scale(1.04);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  line-height: 1.2;
  white-space: nowrap;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* Telemetry Counter */
.telemetry-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  background-color: var(--bg-surface-elevated);
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.telemetry-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.telemetry-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.telemetry-value {
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.telemetry-divider {
  width: 1px;
  height: 14px;
  background-color: var(--border-strong);
}

/* Action Buttons */
.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s var(--spring-smooth);
  text-decoration: none;
  user-select: none;
  line-height: 1;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background-color: var(--accent-terracotta);
  color: #ffffff;
  border-color: var(--accent-terracotta);
  box-shadow: 0 2px 8px var(--accent-terracotta-glow);
}

.btn-primary:hover {
  background-color: var(--accent-terracotta-hover);
  border-color: var(--accent-terracotta-hover);
  box-shadow: 0 4px 16px var(--accent-terracotta-glow);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.btn-danger-hover:hover {
  color: var(--accent-danger);
  border-color: var(--accent-danger);
  background-color: var(--accent-danger-bg);
}

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

.btn-lg {
  padding: 12px 24px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

.install-app-btn {
  border-color: var(--border-strong);
  background-color: var(--bg-surface-elevated);
  transition: all 0.2s var(--spring-smooth);
}

.install-app-btn:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--accent-terracotta);
  color: var(--accent-terracotta);
}

.install-app-btn.install-ready {
  border-color: var(--accent-terracotta);
  color: var(--accent-terracotta);
  background-color: var(--bg-surface);
  box-shadow: 0 0 0 1px var(--accent-terracotta), 0 2px 8px var(--accent-terracotta-glow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --------------------------------------------------------------------------
   Dropdown Menu
   -------------------------------------------------------------------------- */
.dropdown-wrapper {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 220px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-elevated);
  padding: 6px;
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 50;
  transform-origin: top right;
  animation: dropdownEnter 0.2s var(--spring-smooth) forwards;
}

.dropdown-menu.active {
  display: flex;
}

@keyframes dropdownEnter {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-6px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-xs);
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
}

.dropdown-item:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  transform: translateX(2px);
}

/* --------------------------------------------------------------------------
   Main Workspace
   -------------------------------------------------------------------------- */
.main-workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 32px 36px;
  position: relative;
}

/* Global Drop Zone Overlay */
.drop-zone-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 3px dashed var(--accent-terracotta);
  z-index: 60;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  animation: overlayFadeIn 0.2s ease forwards;
}

.drop-zone-overlay.active {
  display: flex;
}

@keyframes overlayFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  color: var(--accent-terracotta);
  text-align: center;
}

.drop-zone-icon-pulse {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 2px solid var(--accent-terracotta);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 32px var(--accent-terracotta-glow);
  animation: dropzonePulse 1.8s var(--spring-smooth) infinite;
}

@keyframes dropzonePulse {
  0% { transform: scale(0.96); box-shadow: 0 0 16px var(--accent-terracotta-glow); }
  50% { transform: scale(1.06); box-shadow: 0 0 36px var(--accent-terracotta-glow); }
  100% { transform: scale(0.96); box-shadow: 0 0 16px var(--accent-terracotta-glow); }
}

.drop-zone-headline {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.drop-zone-caption {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Empty State */
.empty-state-view {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.empty-state-box {
  max-width: 560px;
  width: 100%;
  background-color: var(--bg-surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s var(--spring-smooth);
}

.empty-state-box:hover {
  border-color: var(--accent-terracotta);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.empty-icon-ring {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-terracotta);
  transition: transform 0.4s var(--spring-bounce);
}

.empty-state-box:hover .empty-icon-ring {
  transform: scale(1.08) rotate(4deg);
}

.empty-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.empty-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.empty-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.format-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.format-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  background-color: var(--bg-surface-elevated);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  letter-spacing: 0.04em;
  transition: all 0.2s ease;
}

/* --------------------------------------------------------------------------
   Page Grid View
   -------------------------------------------------------------------------- */
.page-grid-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.grid-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.grid-instruction {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.grid-quick-add {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-terracotta);
  box-shadow: 0 0 8px var(--accent-terracotta-glow);
  animation: dotGlow 2s infinite ease-in-out;
}

@keyframes dotGlow {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.3); }
}

/* Grid Layout */
.page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  align-items: start;
  gap: 24px;
  padding-bottom: 80px;
}

/* Page Card */
.page-card {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.28s var(--spring-smooth), 
              box-shadow 0.28s var(--spring-smooth), 
              border-color 0.2s ease;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  
  /* Staggered entrance animation */
  animation: cardWaterfall 0.4s var(--spring-bounce) backwards;
}

@keyframes cardWaterfall {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.94);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.page-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-5px);
}

.page-card.is-long-press {
  border-color: var(--accent-terracotta);
  box-shadow: 0 0 0 2px var(--accent-terracotta), var(--shadow-card-hover);
  transform: translateY(-3px) scale(1.015);
  z-index: 10;
}

.page-card:active {
  cursor: grabbing;
}

.page-card.dragging {
  opacity: 0.55;
  cursor: grabbing;
  transform: scale(0.96) rotate(-2deg);
  box-shadow: var(--shadow-drag);
}

.page-card.drag-over-left {
  border-left: 3px solid var(--accent-terracotta);
  transform: translateX(4px);
}

.page-card.drag-over-right {
  border-right: 3px solid var(--accent-terracotta);
  transform: translateX(-4px);
}

/* --------------------------------------------------------------------------
   Documents / Pages View Toggle & Document Cards
   -------------------------------------------------------------------------- */
.grid-toolbar {
  flex-wrap: wrap;
  gap: 12px;
}

.view-toggle {
  display: inline-flex;
  padding: 3px;
  gap: 2px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.view-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: 0;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.view-toggle-btn:hover {
  color: var(--text-primary);
}

.view-toggle-btn.active {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.view-toggle-btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Stacked-sheets effect: offset shadows follow the card's single light source */
.doc-stack .card-thumbnail {
  margin: 0 10px 10px 0;
}

.doc-stack.has-stack .card-thumbnail {
  box-shadow:
    4px 4px 0 0 var(--bg-surface),
    4px 4px 0 1px var(--border-strong),
    8px 8px 0 0 var(--bg-surface),
    8px 8px 0 1px var(--border-strong);
}

.doc-count-badge {
  position: absolute;
  left: 10px;
  bottom: 10px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--badge-text);
  background-color: var(--badge-bg);
  border-radius: var(--radius-xs);
}

.page-card.flash {
  animation: cardFlash 1.4s ease-out;
}

@keyframes cardFlash {
  0%, 60% { box-shadow: 0 0 0 3px var(--accent-terracotta), var(--shadow-card-hover); }
  100% { box-shadow: var(--shadow-card); }
}

/* Card Header */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background-color: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.page-number-tag {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
  background-color: var(--badge-bg);
  color: var(--badge-text);
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.06em;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s var(--spring-micro);
  cursor: text;
}

.page-card:hover .page-number-tag {
  transform: scale(1.04);
}

.move-pos-input {
  width: 34px;
  padding: 1px 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--badge-text);
  text-align: center;
  background-color: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 3px;
  outline: none;
  appearance: textfield;
  -moz-appearance: textfield;
  transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.move-pos-input::-webkit-outer-spin-button,
.move-pos-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.move-pos-input:hover:not(:disabled) {
  background-color: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.45);
}

.move-pos-input:focus {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--accent-terracotta);
  box-shadow: 0 0 0 2px var(--accent-terracotta-glow);
}

.move-pos-input:disabled {
  background: transparent;
  border-color: transparent;
  padding: 0;
  width: auto;
  max-width: 24px;
  cursor: default;
}

.doc-card.is-selected {
  border-color: var(--accent-terracotta);
  box-shadow: 0 0 0 2px var(--accent-terracotta), var(--shadow-card-hover);
}

.doc-select-overlay {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: flex;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 0.18s ease, transform 0.18s var(--spring-smooth);
  z-index: 2;
}

.doc-card.is-selected .doc-select-overlay,
.doc-card:hover .doc-select-overlay {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.doc-download-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--accent-terracotta);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-xs);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.15s var(--spring-smooth);
}

.doc-download-pill:hover {
  background-color: var(--accent-terracotta-hover);
  transform: translateY(-1px);
}

.doc-download-pill:active {
  transform: scale(0.95);
}

.source-type-tag {
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 110px;
}

/* Card Thumbnail Viewport */
.card-thumbnail-viewport {
  position: relative;
  width: 100%;
  height: 230px;
  background-color: var(--bg-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 12px;
}

.card-thumbnail {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: var(--shadow-sm);
  border-radius: 3px;
  transition: transform 0.38s var(--spring-bounce);
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.card-thumbnail-viewport:hover .card-thumbnail {
  transform: scale(1.025);
}

/* Card Hover Quick-Zoom Overlay */
.card-zoom-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(28, 25, 23, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
  cursor: pointer;
}

.card-thumbnail-viewport:hover .card-zoom-overlay {
  opacity: 1;
}

.card-zoom-btn {
  background-color: rgba(255, 255, 255, 0.92);
  color: var(--text-primary);
  padding: 7px 12px;
  border-radius: var(--radius-xs);
  font-size: 11px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow-sm);
  transform: translateY(4px);
  transition: transform 0.2s var(--spring-bounce);
}

.card-thumbnail-viewport:hover .card-zoom-btn {
  transform: translateY(0);
}

/* Card Metadata */
.card-meta {
  padding: 9px 12px;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.card-filename {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (hover: hover) {
  .page-card:hover:not(.touch-released) .card-filename {
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    overflow-wrap: anywhere;
    word-break: break-word;
  }
}

.page-card.is-hovered:not(.touch-released) .card-filename,
.page-card.is-long-press .card-filename {
  white-space: normal;
  overflow: visible;
  text-overflow: clip;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-card.is-long-press .card-header {
  background-color: var(--bg-surface-hover);
  border-bottom-color: var(--border-strong);
}

.page-card.is-long-press .card-meta {
  background-color: var(--bg-surface-elevated);
  border-top-color: var(--accent-terracotta);
}

.page-card.is-long-press .card-filename {
  color: var(--accent-terracotta-hover);
}

.card-dimensions {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-top: 2px;
}

/* Card Action Controls Bar */
.card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background-color: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-subtle);
}

.action-icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.16s var(--spring-smooth);
}

.action-icon-btn:hover {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.action-icon-btn:active {
  transform: scale(0.92);
}

.action-icon-btn.danger-btn:hover {
  background-color: var(--accent-danger-bg);
  color: var(--accent-danger);
  border-color: transparent;
}

/* --------------------------------------------------------------------------
   Mobile Sticky Bottom Action Bar
   -------------------------------------------------------------------------- */
.mobile-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(251, 250, 247, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-subtle);
  padding: 6px 12px;
  padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
  z-index: 55;
  box-shadow: 0 -4px 16px rgba(28, 25, 23, 0.06);
  align-items: center;
  justify-content: space-around;
}

.mobile-bar-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  text-decoration: none;
  user-select: none;
  transition: all 0.15s ease;
  min-width: 54px;
}

.mobile-bar-btn:active {
  transform: scale(0.92);
  color: var(--text-primary);
}

.mobile-bar-btn.primary-action {
  background-color: var(--accent-terracotta);
  color: #ffffff;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 8px var(--accent-terracotta-glow);
}

.mobile-bar-btn.primary-action:active {
  background-color: var(--accent-terracotta-hover);
}

/* --------------------------------------------------------------------------
   USP Controls Styling (Settings Drawer)
   -------------------------------------------------------------------------- */
.usp-group {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.usp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.usp-pill {
  background-color: var(--accent-terracotta);
  color: #ffffff;
  font-size: 10px;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.toggle-checkbox-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
}

.toggle-checkbox-card input[type="checkbox"] {
  margin-top: 3px;
  width: 16px;
  height: 16px;
  accent-color: var(--accent-terracotta);
  cursor: pointer;
}

.toggle-card-content {
  display: flex;
  flex-direction: column;
}

.toggle-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.toggle-card-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Settings Drawer (Slide-Over)
   -------------------------------------------------------------------------- */
.settings-drawer-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(28, 25, 23, 0.4);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 70;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.settings-drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.settings-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 380px;
  max-width: 90vw;
  background-color: var(--bg-surface);
  border-left: 1px solid var(--border-strong);
  box-shadow: var(--shadow-elevated);
  z-index: 80;
  transform: translateX(100%);
  transition: transform 0.35s var(--spring-smooth);
  display: flex;
  flex-direction: column;
}

.settings-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
}

.drawer-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.drawer-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  border-radius: var(--radius-xs);
  transition: all 0.15s ease;
}

.drawer-close-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.form-input {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  outline: none;
  transition: all 0.2s ease;
}

.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-terracotta-glow);
}

.form-hint {
  font-size: 11px;
  color: var(--text-muted);
}

/* Radio Card Group */
.radio-card-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s var(--spring-smooth);
}

.radio-card:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-surface-elevated);
  transform: translateY(-1px);
}

.radio-card input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--accent-terracotta);
}

.radio-card input[type="radio"]:checked + .radio-card-content .radio-card-title {
  color: var(--accent-terracotta);
}

.radio-card-content {
  display: flex;
  flex-direction: column;
}

.radio-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.radio-card-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Button Group (Pill Buttons) */
.button-group {
  display: flex;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 4px;
  gap: 3px;
}

.btn-group-item {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  padding: 7px 10px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all 0.16s var(--spring-smooth);
  text-align: center;
}

.btn-group-item.active {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.drawer-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
}

/* --------------------------------------------------------------------------
   High-Res Lightbox Modal
   -------------------------------------------------------------------------- */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.lightbox-modal.active {
  display: flex;
  animation: modalFadeIn 0.25s ease forwards;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.lightbox-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(28, 25, 23, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.lightbox-dialog {
  position: relative;
  z-index: 95;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  max-width: 920px;
  max-height: 90vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  animation: lightboxDialogEnter 0.3s var(--spring-bounce) forwards;
}

@keyframes lightboxDialogEnter {
  from {
    transform: scale(0.92) translateY(12px);
  }
  to {
    transform: scale(1) translateY(0);
  }
}

.lightbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
}

.lightbox-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.lightbox-badge {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
  background-color: var(--badge-bg);
  color: var(--badge-text);
  padding: 3px 8px;
  border-radius: 4px;
  flex-shrink: 0;
}

.lightbox-filename {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lightbox-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-xs);
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.lightbox-close-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.lightbox-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background-color: var(--bg-surface-elevated);
  overflow: auto;
  min-height: 300px;
}

.lightbox-viewport img {
  max-width: 100%;
  max-height: 60vh;
  object-fit: contain;
  box-shadow: var(--shadow-elevated);
  border-radius: 4px;
  transition: transform 0.35s var(--spring-bounce);
}

.lightbox-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
}

.lightbox-meta {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Export Progress Overlay Modal
   -------------------------------------------------------------------------- */
.processing-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(28, 25, 23, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.processing-modal.active {
  display: flex;
  animation: modalFadeIn 0.2s ease forwards;
}

.processing-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  width: 380px;
  max-width: 90vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  box-shadow: var(--shadow-elevated);
  animation: lightboxDialogEnter 0.25s var(--spring-bounce) forwards;
}

.spinner-ring {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--accent-terracotta);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.processing-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.processing-status {
  font-size: 12px;
  color: var(--text-secondary);
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background-color: var(--bg-surface-elevated);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.progress-bar-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #c2410c, #d97706, #c2410c);
  background-size: 200% 100%;
  border-radius: 4px;
  transition: width 150ms ease;
  animation: progressShimmer 2s linear infinite;
}

@keyframes progressShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --------------------------------------------------------------------------
   Toast Notifications
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 110;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  box-shadow: var(--shadow-elevated);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastSpring 0.35s var(--spring-bounce) forwards;
  pointer-events: auto;
  max-width: 88vw;
}

.toast.toast-success {
  border-left: 4px solid var(--accent-terracotta);
}

.toast.toast-error {
  border-left: 4px solid var(--accent-danger);
}

@keyframes toastSpring {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.92);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* --------------------------------------------------------------------------
   Install & App Icon Guidance Modal
   -------------------------------------------------------------------------- */
.install-modal {
  position: fixed;
  inset: 0;
  z-index: 95;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.install-modal.active {
  display: flex;
}

.install-modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(28, 25, 23, 0.55);
  backdrop-filter: blur(6px);
  animation: modalFadeIn 0.25s ease forwards;
}

.install-modal-card {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 480px;
  max-width: 92vw;
  box-shadow: var(--shadow-elevated);
  animation: lightboxDialogEnter 0.28s var(--spring-bounce) forwards;
  z-index: 1;
}

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

.install-header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.install-app-icon-preview {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(28, 25, 23, 0.12);
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.install-app-icon-preview img {
  width: 100%;
  height: 100%;
  display: block;
}

.install-modal-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.install-modal-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.install-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.install-close-btn:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
}

.install-intro-text {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.5;
}

/* iOS Safari 3-Step Guide */
.install-steps-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.install-step-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px 14px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.install-step-number {
  width: 26px;
  height: 26px;
  background-color: var(--accent-terracotta);
  color: #ffffff;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.install-step-body {
  flex: 1;
}

.install-step-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.install-step-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

.install-step-glyph-box {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  padding: 4px 10px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xs);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Mac Desktop Options */
.mac-install-options {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mac-option-box {
  padding: 14px 16px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.mac-option-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--accent-terracotta);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.mac-option-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 10px;
}

/* Settings Drawer Install Card */
.install-drawer-group {
  margin-top: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.install-drawer-card {
  padding: 12px 14px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.install-drawer-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================================================
   Responsive Breakpoints & Device Adaptations (iPhone, iPad, Mobile)
   ========================================================================== */

/* Tablet / iPad Adaptations (Width <= 1024px) */
@media (max-width: 1024px) {
  .top-bar {
    padding: 12px 20px;
  }

  .main-workspace {
    padding: 24px 20px;
  }

  .page-grid {
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 16px;
  }
}

/* Mobile Screens (Width <= 768px: iPhone, Android, Mini-Tablets) */
@media (max-width: 768px) {
  .view-toggle {
    width: 100%;
  }

  .view-toggle-btn {
    flex: 1;
    justify-content: center;
    padding: 8px 12px;
  }

  .top-bar {
    padding: 10px 14px;
  }

  .brand-title {
    font-size: 13px;
  }

  .brand-subtitle {
    display: none;
  }

  .telemetry-bar {
    padding: 4px 10px;
    gap: 8px;
  }

  .telemetry-label {
    display: none;
  }

  .telemetry-value {
    font-size: 12px;
  }

  /* Hide Desktop Top Buttons on Mobile */
  .desktop-only-btn {
    display: none !important;
  }

  .dropdown-menu {
    position: fixed;
    top: auto;
    bottom: calc(68px + env(safe-area-inset-bottom, 0px));
    left: 14px;
    right: 14px;
    min-width: 0;
    z-index: 65;
    transform-origin: bottom center;
  }

  .install-app-btn .install-btn-text {
    display: none;
  }

  .install-app-btn {
    padding: 6px 10px;
  }

  /* Show Mobile Sticky Bottom Dock */
  .mobile-bottom-bar {
    display: flex;
  }

  /* Safe Area Spacing on Main Workspace */
  .main-workspace {
    padding: 16px 14px;
    padding-bottom: calc(76px + env(safe-area-inset-bottom, 12px));
  }

  /* 2-Column Mobile Card Grid */
  .page-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding-bottom: 24px;
  }

  .page-card {
    border-radius: var(--radius-sm);
  }

  .card-header {
    padding: 6px 8px;
  }

  .page-number-tag {
    font-size: 10px;
    padding: 2px 6px;
  }

  .source-type-tag {
    font-size: 9px;
    max-width: 70px;
  }

  .card-thumbnail-viewport {
    height: 150px;
    padding: 8px;
  }

  .card-meta {
    padding: 6px 8px;
  }

  .card-filename {
    font-size: 11px;
  }

  .card-dimensions {
    font-size: 9px;
  }

  .card-actions {
    padding: 6px 6px;
  }

  .action-icon-btn {
    width: 28px;
    height: 28px;
  }

  .empty-state-box {
    padding: 36px 20px;
    border-radius: var(--radius-md);
  }

  .empty-title {
    font-size: 18px;
  }

  .empty-description {
    font-size: 13px;
  }

  /* Mobile Full-Width Settings Drawer */
  .settings-drawer {
    width: 100vw;
    max-width: 100vw;
    border-left: none;
  }

  .settings-btn-label {
    display: none;
  }

  /* Lightbox on Mobile */
  .lightbox-modal {
    padding: 10px;
  }

  .lightbox-viewport {
    min-height: 220px;
    padding: 12px;
  }

  .toast-container {
    bottom: calc(72px + env(safe-area-inset-bottom, 12px));
    right: 14px;
    left: 14px;
    align-items: center;
  }
}

/* Small Smartphone Viewports (Width <= 420px) */
@media (max-width: 420px) {
  .page-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .card-thumbnail-viewport {
    height: 130px;
  }

  .card-filename {
    font-size: 10px;
  }

  .action-icon-btn {
    width: 26px;
    height: 26px;
  }
}

/* --------------------------------------------------------------------------
   Crop Editor and Crop Badges
   -------------------------------------------------------------------------- */
.crop-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.crop-modal.active {
  display: flex;
  animation: modalFadeIn 0.25s ease forwards;
}

.crop-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(28, 25, 23, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.crop-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: min(720px, 100%);
  max-height: 100%;
  padding: 16px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-elevated);
}

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

.crop-header h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--text-primary);
}

.crop-hint {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.crop-hint-error {
  color: var(--accent-danger);
}

.crop-stage-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  overflow: auto;
  padding: 12px;
  background-color: var(--bg-surface-elevated);
  border-radius: var(--radius-md);
}

.crop-stage {
  position: relative;
  display: inline-block;
  line-height: 0;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.crop-stage img {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 58vh;
  border-radius: 3px;
}

.crop-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.crop-overlay polygon {
  fill: rgba(194, 65, 12, 0.12);
  stroke: var(--accent-terracotta);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.crop-handle {
  position: absolute;
  width: 28px;
  height: 28px;
  margin: -14px 0 0 -14px;
  padding: 0;
  border: 2px solid var(--bg-surface);
  border-radius: 50%;
  background-color: var(--accent-terracotta);
  box-shadow: var(--shadow-sm), 0 0 0 1px var(--accent-terracotta-hover);
  cursor: grab;
  touch-action: none;
}

.crop-handle::after {
  content: '';
  position: absolute;
  inset: -8px; /* larger touch target */
  border-radius: 50%;
}

.crop-handle:hover,
.crop-handle.dragging {
  background-color: var(--accent-terracotta-hover);
}

.crop-handle.dragging {
  cursor: grabbing;
}

.crop-handle:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

.crop-loupe {
  position: absolute;
  top: 8px;
  display: none;
  width: 112px;
  height: 112px;
  border: 3px solid var(--bg-surface);
  border-radius: 50%;
  background-color: var(--bg-surface-elevated);
  box-shadow: var(--shadow-elevated);
  pointer-events: none;
}

.crop-loupe.visible {
  display: block;
}

.crop-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crop-spacer {
  flex: 1;
}

.header-tags {
  display: flex;
  align-items: center;
  gap: 6px;
}

.crop-badge {
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
  background-color: var(--bg-surface-hover);
  border-radius: var(--radius-xs);
}

.crop-badge.auto,
.crop-badge.manual {
  color: var(--accent-terracotta-hover);
  background-color: var(--accent-terracotta-glow);
}

.crop-badge.review {
  color: var(--accent-danger);
  background-color: var(--accent-danger-bg);
}

/* Split dialog */
.split-panel {
  width: min(760px, 100%);
}

.split-strip {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 0;
  padding: 12px 8px;
  overflow-x: auto;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.split-page {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 72px;
}

.split-page img {
  width: 72px;
  height: 96px;
  object-fit: contain;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
}

.split-page span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

.split-gap {
  position: relative;
  flex: 0 0 auto;
  align-self: stretch;
  width: 22px;
  padding: 0;
  cursor: pointer;
  background: transparent;
  border: 0;
}

.split-gap::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 18px;
  left: 50%;
  width: 2px;
  background-color: transparent;
  border-radius: 1px;
  transform: translateX(-50%);
  transition: background-color 0.15s ease;
}

.split-gap:hover::before {
  background-color: var(--border-strong, var(--border-subtle));
}

.split-gap.selected::before {
  width: 3px;
  background-color: var(--accent-terracotta);
}

.split-gap.selected::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 50%;
  width: 9px;
  height: 9px;
  background-color: var(--accent-terracotta);
  border: 2px solid var(--bg-canvas);
  border-radius: 50%;
  transform: translateX(-50%);
}

.split-gap:focus-visible {
  outline: 2px solid var(--accent-terracotta);
  outline-offset: -2px;
}

.split-controls {
  display: flex;
  align-items: center;
}

.split-field {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-primary);
}

.split-field input {
  width: 84px;
  padding: 6px 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

#split-input {
  width: 140px;
}

.split-field input:focus-visible {
  outline: 2px solid var(--accent-terracotta);
  outline-offset: 1px;
}

.split-field input.invalid {
  border-color: var(--accent-danger);
}

.split-summary {
  margin: 0;
  min-height: 1.4em;
  font-size: 13px;
  color: var(--text-primary);
}

.split-modes {
  display: flex;
  gap: 4px;
  padding: 3px;
  background-color: var(--bg-surface-hover);
  border-radius: var(--radius-sm);
}

.split-mode-btn {
  flex: 1;
  padding: 7px 6px;
  white-space: nowrap;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  background: transparent;
  border: 0;
  border-radius: var(--radius-xs);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.split-mode-btn[aria-selected="true"] {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.split-mode-btn:focus-visible {
  outline: 2px solid var(--accent-terracotta);
  outline-offset: 1px;
}

.split-field[hidden] {
  display: none;
}

.split-field-wide {
  flex: 1;
}

.split-field-wide input {
  flex: 1;
  width: auto;
  min-width: 0;
}

.split-summary {
  line-height: 1.5;
}

/* Find page numbers dialog */
.finder-panel {
  width: min(880px, 100%);
  max-height: calc(100vh - 32px);
  overflow-y: auto;
}

.finder-step[hidden],
.finder-picker[hidden],
.finder-source [hidden] {
  display: none;
}

.finder-step {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.finder-source {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.finder-file-name {
  min-width: 0;
  overflow: hidden;
  font-size: 13px;
  color: var(--text-secondary);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.finder-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.finder-warnings {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.finder-warnings p {
  margin: 0;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-primary);
  background-color: var(--bg-surface-hover);
  border-left: 3px solid var(--accent-terracotta);
  border-radius: var(--radius-xs);
}

.finder-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.finder-row {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 8px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.finder-thumb {
  width: 150px;
  height: auto;
  background-color: var(--bg-canvas);
  border-radius: var(--radius-xs);
}

.finder-row-main {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.finder-label {
  width: 100%;
  padding: 6px 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
}

.finder-label:hover,
.finder-label:focus-visible {
  border-color: var(--border-strong);
  outline: none;
}

.finder-entry-crop {
  max-height: 56px;
  overflow: hidden;
  border-radius: var(--radius-xs);
}

.finder-entry-crop img {
  width: 100%;
  height: auto;
}

.finder-page-btn {
  min-width: 84px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  background-color: var(--bg-surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

button.finder-page-btn {
  cursor: pointer;
}

button.finder-page-btn:hover,
button.finder-page-btn:focus-visible {
  border-color: var(--accent-terracotta);
  outline: none;
}

.finder-status {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-terracotta-hover);
}

.finder-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.finder-chip {
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  background-color: var(--bg-surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
}

.finder-chip:hover,
.finder-chip:focus-visible {
  border-color: var(--accent-terracotta);
  outline: none;
}

.finder-counting {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.finder-counting legend {
  padding: 0 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.finder-radio {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-primary);
}

.finder-radio input[type="number"] {
  width: 64px;
  padding: 4px 6px;
  font-family: var(--font-mono);
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
}

.finder-picker {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  overflow-y: auto;
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
}

.finder-picker-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}

.finder-picker-option {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
  font-size: 13px;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.finder-picker-option:hover,
.finder-picker-option:focus-visible {
  border-color: var(--accent-terracotta);
  outline: none;
}

.finder-picker-option img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xs);
}

@media (max-width: 768px) {
  .finder-row {
    grid-template-columns: 96px 1fr;
  }

  .finder-thumb {
    width: 96px;
  }

  .finder-row .finder-page-btn {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .crop-panel {
    padding: 12px;
  }

  .crop-footer .btn {
    flex: 1;
    justify-content: center;
  }

  .crop-spacer {
    display: none;
  }
}


/* --------------------------------------------------------------------------
   Mid-size windows (laptops, a resized Mac window): the full header needs
   about 1270px, so it shrinks in steps and finally wraps. A control is never
   pushed off-screen. Phones (<= 768px) use their own bottom dock below.
   -------------------------------------------------------------------------- */
@media (min-width: 769px) and (max-width: 1320px) {
  .top-bar {
    padding: 12px 20px;
    gap: 12px;
  }

  .top-actions {
    gap: 8px;
  }

  /* Icon-only: every one of these buttons has a title and aria-label. */
  .top-actions .btn > span:not(#export-btn-text) {
    display: none;
  }

  .top-actions .btn {
    padding-left: 11px;
    padding-right: 11px;
  }
}

@media (min-width: 769px) and (max-width: 980px) {
  .brand-subtitle {
    display: none;
  }

  .top-bar {
    flex-wrap: wrap;
    row-gap: 8px;
  }

  .top-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
    row-gap: 8px;
  }
}

/* --------------------------------------------------------------------------
   Accessibility: Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}