styles.css

/* ==========================================================================
   OFFLINE PDF TOOLBOX: REDESIGNED ULTIMATE UI DESIGN SYSTEM (styles.css)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. HSL SYSTEM & TAILORMADE THEMING
   -------------------------------------------------------------------------- */
:root {
  /* Fonts */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Elastic Micro-transitions */
  --transition-fast: 0.12s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-normal: 0.28s cubic-bezier(0.175, 0.885, 0.32, 1.1);
  --transition-slow: 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 30px -5px rgba(0, 0, 0, 0.25), 0 10px 15px -5px rgba(0, 0, 0, 0.1);
}

/* Premium Dark Mode */
[data-theme="dark"] {
  --bg-app: hsl(230, 25%, 5%);
  --bg-surface: hsl(230, 24%, 8%);
  --bg-surface-glass: rgba(14, 16, 27, 0.72);
  --bg-card: hsl(230, 24%, 12%);
  --bg-input: hsl(230, 22%, 15%);
  --bg-input-focus: hsl(230, 22%, 18%);
  --border-color: hsl(230, 18%, 18%);
  --border-color-hover: hsl(230, 18%, 28%);
  
  --text-main: hsl(210, 20%, 96%);
  --text-secondary: hsl(215, 15%, 72%);
  --text-muted: hsl(215, 12%, 50%);

  --primary: hsl(221, 83%, 53%);
  --primary-hover: hsl(221, 83%, 45%);
  --primary-light: rgba(99, 102, 241, 0.12);
  
  --accent: hsl(271, 91%, 65%);
  --accent-hover: hsl(271, 91%, 58%);
  
  --success: hsl(150, 84%, 42%);
  --danger: hsl(350, 84%, 58%);
  --danger-hover: hsl(350, 84%, 50%);
  --danger-light: rgba(239, 68, 68, 0.12);
  
  --glass-blur: blur(14px);
  --card-shadow: var(--shadow-xl);
  --glow-color: rgba(99, 102, 241, 0.35);
  
  --scrollbar-thumb: hsl(230, 15%, 22%);
  --scrollbar-track: hsl(230, 25%, 5%);
}

/* Premium Light Mode */
[data-theme="light"] {
  --bg-app: hsl(210, 40%, 96%);
  --bg-surface: hsl(0, 0%, 100%);
  --bg-surface-glass: rgba(255, 255, 255, 0.78);
  --bg-card: hsl(210, 30%, 98%);
  --bg-input: hsl(0, 0%, 100%);
  --bg-input-focus: hsl(210, 20%, 96%);
  --border-color: hsl(210, 18%, 88%);
  --border-color-hover: hsl(210, 18%, 76%);
  
  --text-main: hsl(222, 47%, 11%);
  --text-secondary: hsl(215, 25%, 35%);
  --text-muted: hsl(215, 16%, 57%);

  --primary: hsl(221, 83%, 53%);
  --primary-hover: hsl(221, 83%, 45%);
  --primary-light: rgba(79, 70, 229, 0.08);
  
  --accent: hsl(271, 81%, 50%);
  --accent-hover: hsl(271, 81%, 42%);
  
  --success: hsl(150, 74%, 32%);
  --danger: hsl(350, 74%, 48%);
  --danger-hover: hsl(350, 74%, 40%);
  --danger-light: rgba(220, 38, 38, 0.06);
  
  --glass-blur: blur(16px);
  --card-shadow: var(--shadow-lg);
  --glow-color: rgba(79, 70, 229, 0.2);
  
  --scrollbar-thumb: hsl(210, 15%, 80%);
  --scrollbar-track: hsl(210, 30%, 98%);
}

/* --------------------------------------------------------------------------
   2. BASIC RESET & DOCUMENT VIEWPORTS
   -------------------------------------------------------------------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-color-hover);
}

.hidden { display: none !important; }
.hidden-input { display: none !important; }
.text-center { text-align: center; }

/* --------------------------------------------------------------------------
   3. APP LAYOUT GRID SHELL
   -------------------------------------------------------------------------- */
.app-layout {
  display: grid;
  grid-template-columns: 290px 1fr;
  min-height: 100vh;
}

/* --------------------------------------------------------------------------
   4. SIDEBAR NAVIGATION MENU (LEFT)
   -------------------------------------------------------------------------- */
.app-sidebar {
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  padding: 1.75rem 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  overflow-y: auto;
  position: sticky;
  top: 0;
  height: 100vh;
  transition: all var(--transition-normal);
  z-index: 100;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  cursor: pointer;
  padding-bottom: 0.5rem;
  transition: transform var(--transition-fast);
}

.sidebar-header:hover {
  transform: translateY(-1px);
}

.logo-wrapper {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px var(--glow-color);
}

.logo-svg {
  width: 24px;
  height: 24px;
}

.logo-text h2 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 850;
  letter-spacing: -0.03em;
  line-height: 1;
}

.version-tag {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-top: 0.15rem;
  display: block;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.38rem;
  flex: 1;
}

.nav-group-label {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-top: 1.25rem;
  margin-bottom: 0.35rem;
  padding-left: 0.85rem;
}

.nav-link {
  font-family: var(--font-body);
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.885rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-main);
  background-color: var(--primary-light);
  transform: translateX(3px);
}

.nav-link.active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 4px 14px var(--glow-color);
}

.nav-link.active:hover {
  transform: none;
}

.nav-link i {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.offline-ready-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--success);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 10px var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

/* --------------------------------------------------------------------------
   5. MAIN WORKSPACE SHELL (RIGHT)
   -------------------------------------------------------------------------- */
.main-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.shell-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.35rem 2.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  flex-shrink: 0;
  z-index: 90;
}

#workspace-title {
  font-family: var(--font-heading);
  font-size: 1.55rem;
  font-weight: 850;
  letter-spacing: -0.03em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.shell-main {
  flex: 1;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
}

.shell-footer {
  padding: 1rem 2.5rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   6. CORE BUTTONS & UI CONTROLS
   -------------------------------------------------------------------------- */
.btn {
  font-family: var(--font-heading);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.7rem 1.4rem;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  outline: none;
  user-select: none;
}

.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.75rem; border-radius: 9px; }
.btn-lg { padding: 0.9rem 1.9rem; font-size: 0.95rem; border-radius: 14px; }
.btn-block { width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff;
  box-shadow: 0 4px 14px var(--glow-color);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--glow-color);
  opacity: 0.95;
}
.btn-primary:active:not(:disabled) { transform: translateY(1px); }
.btn-primary:disabled {
  background: var(--border-color);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-card);
  border-color: var(--border-color-hover);
  transform: translateY(-1px);
}
.btn-outline:disabled {
  border-color: var(--border-color);
  color: var(--text-muted);
  cursor: not-allowed;
}

.btn-outline-danger {
  background: transparent;
  border-color: rgba(239, 68, 68, 0.35);
  color: var(--danger);
}
.btn-outline-danger:hover:not(:disabled) {
  background-color: var(--danger-light);
  border-color: var(--danger);
  transform: translateY(-1px);
}
.btn-outline-danger:disabled {
  border-color: var(--border-color);
  color: var(--text-muted);
  cursor: not-allowed;
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-secondary);
}
.btn-text:hover {
  color: var(--text-main);
  background-color: var(--primary-light);
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
}
.icon-btn:hover {
  border-color: var(--border-color-hover);
  color: var(--text-main);
  background-color: var(--bg-card);
  transform: scale(1.03);
}

/* --------------------------------------------------------------------------
   7. DASHBOARD VIEW INTERFACE
   -------------------------------------------------------------------------- */
.dashboard-hero {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(168, 85, 247, 0.08));
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 3rem 2.5rem;
  margin-bottom: 3rem;
  text-align: center;
}

.dashboard-hero h2 {
  font-family: var(--font-heading);
  font-size: 2.15rem;
  font-weight: 850;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

.dashboard-hero p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.6;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.75rem;
}

.tool-card {
  background: var(--bg-surface-glass);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.75rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.tool-card:hover {
  border-color: var(--primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl), 0 8px 24px var(--primary-light);
}

.tool-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

.tool-icon-wrapper i {
  width: 26px;
  height: 26px;
}

.merge-gradient { background: linear-gradient(135deg, #6366f1, #818cf8); }
.split-gradient { background: linear-gradient(135deg, #f43f5e, #fb7185); }
.organize-gradient { background: linear-gradient(135deg, #a855f7, #c084fc); }
.jpg-to-pdf-gradient { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.pdf-to-jpg-gradient { background: linear-gradient(135deg, #10b981, #34d399); }
.sign-gradient { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.watermark-gradient { background: linear-gradient(135deg, #ec4899, #f472b6); }
.numbers-gradient { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
.scan-gradient { background: linear-gradient(135deg, #14b8a6, #2dd4bf); }
.crop-gradient { background: linear-gradient(135deg, #6b7280, #9ca3af); }

.tool-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.tool-card p {
  font-size: 0.865rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   8. MODULAR WORKSPACE SPLIT LAYOUT
   -------------------------------------------------------------------------- */
.workspace-view {
  animation: viewFadeIn var(--transition-normal);
  height: 100%;
}

@keyframes viewFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.workspace-layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 2.5rem;
  align-items: start;
  height: 100%;
}

.workspace-controls-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  position: sticky;
  top: 0;
}

.config-card {
  background: var(--bg-surface-glass);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.config-card h3 {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-color);
}

.workspace-queue-main {
  background: var(--bg-surface-glass);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.75rem;
  min-height: 520px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Form Groups */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.field-group label {
  font-size: 0.785rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.field-group input[type="text"],
.field-group input[type="number"],
.field-group select {
  font-family: var(--font-body);
  font-size: 0.88rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.65rem 0.95rem;
  border-radius: 10px;
  outline: none;
  width: 100%;
  transition: all var(--transition-fast);
}

.field-group input:focus,
.field-group select:focus {
  border-color: var(--primary);
  background-color: var(--bg-input-focus);
  box-shadow: 0 0 10px var(--primary-light);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrapper input {
  padding-right: 3.5rem !important;
}

.input-suffix {
  position: absolute;
  right: 0.95rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.35rem;
}

.radio-label {
  font-size: 0.885rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.radio-label input {
  accent-color: var(--primary);
  transform: scale(1.1);
}

.action-group {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

/* --------------------------------------------------------------------------
   9. FILE DRAG AND DROP ZONE
   -------------------------------------------------------------------------- */
.dropzone {
  border: 2.5px dashed var(--border-color);
  border-radius: 16px;
  padding: 3.5rem 2rem;
  text-align: center;
  background: rgba(99, 102, 241, 0.01);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.dropzone.dragover {
  border-color: var(--primary);
  background-color: var(--primary-light);
  box-shadow: 0 0 20px var(--primary-light);
}

.dropzone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  user-select: none;
}

.dropzone-inner p {
  font-size: 1rem;
  font-weight: 500;
}

.dropzone-inner p span {
  color: var(--primary);
  font-weight: 750;
  text-decoration: underline;
}

.drop-icon {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  transition: transform var(--transition-normal);
}

.dropzone:hover .drop-icon {
  color: var(--primary);
  transform: translateY(-3px);
}

/* Compact layout */
.dropzone.compact {
  padding: 1.5rem;
}
.dropzone.compact .drop-icon {
  width: 26px;
  height: 26px;
  margin-bottom: 0;
}
.dropzone.compact p { font-size: 0.85rem; }

/* --------------------------------------------------------------------------
   10. METRICS BAR
   -------------------------------------------------------------------------- */
.metrics-bar {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  animation: fadeIn var(--transition-normal);
}

.metric-badge {
  font-size: 0.785rem;
  font-weight: 700;
  background-color: var(--bg-card);
  color: var(--text-secondary);
  padding: 0.4rem 0.85rem;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid var(--border-color);
}

.metric-badge i {
  width: 15px;
  height: 15px;
}

/* --------------------------------------------------------------------------
   11. FILE LIST QUEUE / DND DRAG ITEMS
   -------------------------------------------------------------------------- */
.sortable-queue-list {
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
}

.pdf-card {
  display: grid;
  grid-template-columns: auto 70px 1fr auto;
  gap: 1.5rem;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.pdf-card:hover {
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-md);
}

.reorder-controls {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  color: var(--text-muted);
}

.reorder-handle {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
}
.reorder-handle:hover { color: var(--text-main); }

.reorder-arrows {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.arrow-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.arrow-btn:hover { color: var(--text-main); }
.arrow-btn:disabled { color: transparent; cursor: default; }

.pdf-preview-box {
  width: 70px;
  height: 85px;
  background-color: var(--bg-app);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdf-preview-canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.mini-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.pdf-meta-controls {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.pdf-filename {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 750;
  word-break: break-all;
  line-height: 1.25;
}

.pdf-details {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.85rem;
}

.pdf-controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.control-field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.control-field label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.control-field input,
.control-field select {
  font-family: var(--font-body);
  font-size: 0.785rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.4rem 0.65rem;
  border-radius: 8px;
  outline: none;
}

.pdf-remove-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pdf-remove-btn:hover {
  color: var(--danger);
  background-color: var(--danger-light);
}

/* --------------------------------------------------------------------------
   12. SORTABLE QUEUE FOR IMAGES
   -------------------------------------------------------------------------- */
.sortable-image-queue {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1.15rem;
}

.image-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  cursor: grab;
}

.image-card:hover {
  border-color: var(--border-color-hover);
}

.img-preview-box {
  height: 130px;
  background-color: var(--bg-app);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.img-preview-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.image-card-footer {
  padding: 0.65rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(0,0,0,0.12);
}

.img-filename {
  font-size: 0.72rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   13. FILE LOADED VIEW AND VISUAL GRIDS
   -------------------------------------------------------------------------- */
.file-loaded-panel {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  animation: fadeIn var(--transition-normal);
}

.loaded-file-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem 1.5rem;
}

.loaded-info {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.loaded-info h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 800;
  word-break: break-all;
}

.loaded-info p {
  font-size: 0.785rem;
  color: var(--text-secondary);
}

.subtitle {
  font-size: 0.885rem;
  color: var(--text-secondary);
}

/* GRID 1: Split visual page select */
.thumbnail-select-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1.15rem;
}

.page-select-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
  aspect-ratio: 3/4;
}

.page-select-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-1px);
}

.page-select-card.selected {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-light);
}

.page-canvas-wrapper {
  width: 100%;
  height: calc(100% - 26px);
  position: relative;
  background: var(--bg-app);
}

.page-canvas-wrapper canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-select-card-footer {
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  background-color: rgba(0,0,0,0.12);
  color: var(--text-secondary);
}

.page-select-card.selected .page-select-card-footer {
  background-color: var(--primary-light);
  color: var(--primary);
}

.selection-checkbox {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  border: 1.5px solid var(--border-color);
  display: inline-block;
  transition: all var(--transition-fast);
}
.page-select-card.selected .selection-checkbox {
  background-color: var(--primary);
  border-color: var(--primary);
  position: relative;
}
.page-select-card.selected .selection-checkbox::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 3px;
  height: 6px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* GRID 2: Organize grid */
.organize-thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1.35rem;
}

.page-organize-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  cursor: grab;
  position: relative;
  transition: all var(--transition-fast);
  aspect-ratio: 3/4;
}
.page-organize-card:active { cursor: grabbing; }

.page-organize-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-3px);
}

.organize-actions-overlay {
  position: absolute;
  top: 6px;
  right: 6px;
  left: 6px;
  display: flex;
  justify-content: space-between;
  z-index: 5;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.page-organize-card:hover .organize-actions-overlay {
  opacity: 1;
}

.org-mini-btn {
  background: rgba(15, 17, 29, 0.95);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 8px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}
.org-mini-btn:hover { background-color: var(--primary); }
.org-mini-btn.btn-del:hover { background-color: var(--danger); }

/* GRID 3: View-only page grid */
.view-only-thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1.15rem;
}

.page-view-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 3/4;
}

.page-view-card canvas {
  width: 100%;
  height: calc(100% - 24px);
  object-fit: cover;
  background-color: var(--bg-app);
}

.page-view-card-footer {
  height: 24px;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  line-height: 24px;
  background-color: rgba(0,0,0,0.12);
}

/* --------------------------------------------------------------------------
   14. PREVIEW CANVAS HOLDERS
   -------------------------------------------------------------------------- */
.preview-canvas-holder {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.preview-canvas-holder canvas {
  max-width: 100%;
  max-height: 440px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  background-color: #ffffff;
}

/* --------------------------------------------------------------------------
   15. CROP BOX PREVIEW OVERLAYS
   -------------------------------------------------------------------------- */
.crop-visual-box {
  position: absolute;
  border: 2px dashed var(--primary);
  box-shadow: 0 0 12px var(--glow-color), inset 0 0 12px var(--glow-color);
  pointer-events: auto !important;
  box-sizing: border-box;
  cursor: move;
}

.crop-resize-handle {
  position: absolute;
  width: 12px;
  height: 12px;
  background-color: var(--primary);
  border: 2px solid #ffffff;
  border-radius: 50%;
  z-index: 100;
}

.crop-resize-handle.tl { top: -6px; left: -6px; cursor: nwse-resize; }
.crop-resize-handle.tr { top: -6px; right: -6px; cursor: nesw-resize; }
.crop-resize-handle.bl { bottom: -6px; left: -6px; cursor: nesw-resize; }
.crop-resize-handle.br { bottom: -6px; right: -6px; cursor: nwse-resize; }

/* --------------------------------------------------------------------------
   16. SIGN WORKSPACE VIEWER LAYOUT
   -------------------------------------------------------------------------- */
.viewer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 0.5rem;
}

.pdf-viewer-canvas-outer {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow: auto;
  min-height: 500px;
  max-height: 620px;
}

.pdf-viewer-container {
  position: relative;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  background-color: #ffffff;
}

.pdf-viewer-container canvas {
  display: block;
}

/* Floating annotation stamp overlay */
.floating-stamp {
  position: absolute;
  cursor: move;
  border: 1.5px dashed var(--primary);
  background-color: rgba(99, 102, 241, 0.08);
  box-sizing: border-box;
  padding: 5px;
}

.floating-stamp.active {
  border-color: var(--accent);
  background-color: rgba(168, 85, 247, 0.08);
}

.stamp-content {
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stamp-content img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.stamp-content span {
  font-family: var(--font-body);
  font-weight: 600;
  word-break: break-all;
  white-space: pre-wrap;
  color: #000000;
}

.stamp-btn-del {
  position: absolute;
  top: -10px;
  right: -10px;
  background-color: var(--danger);
  color: #ffffff;
  border: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 11px;
}

.stamp-handle-se {
  position: absolute;
  bottom: -4px;
  right: -4px;
  background-color: var(--primary);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  cursor: se-resize;
}

/* --------------------------------------------------------------------------
   17. SCAN TO PDF VIEWPORT
   -------------------------------------------------------------------------- */
.scan-viewframe {
  aspect-ratio: 4/3;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  position: relative;
  background-color: #000000;
}

.scan-viewframe video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-grid-overlay {
  position: absolute;
  inset: 0;
  border: 30px solid rgba(0, 0, 0, 0.45);
  box-shadow: inset 0 0 0 1.5px rgba(255, 255, 255, 0.4);
  pointer-events: none;
}

.scan-queue-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   18. SIGNING CANVAS / TEXT MODALS
   -------------------------------------------------------------------------- */
.sign-canvas-border {
  border: 1.5px solid var(--border-color);
  background-color: #ffffff;
  border-radius: 12px;
  overflow: hidden;
}

#signature-pad-canvas {
  display: block;
  cursor: crosshair;
}

/* --------------------------------------------------------------------------
   19. LASER CURSOR GLOW FOR PRESENTATION MODE
   -------------------------------------------------------------------------- */
.laser-pointer {
  position: absolute;
  width: 14px;
  height: 14px;
  background-color: #ff3b30;
  border-radius: 50%;
  box-shadow: 0 0 10px #ff3b30, 0 0 25px #ff3b30, 0 0 45px #ff3b30;
  pointer-events: none;
  z-index: 999;
  transform: translate(-50%, -50%);
}

/* --------------------------------------------------------------------------
   20. OVERLAYS & MODALS
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-normal);
}

.glass-modal {
  background: var(--bg-surface-glass);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 3rem;
  width: 90%;
  max-width: 450px;
  box-shadow: var(--shadow-xl);
  backdrop-filter: var(--glass-blur);
}

.spinner-container {
  position: relative;
  width: 64px;
  height: 64px;
  margin: 0 auto 1.75rem;
}

.spinner {
  width: 100%;
  height: 100%;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.spinner-glow {
  position: absolute;
  inset: -4px;
  border: 4px solid transparent;
  border-top-color: var(--accent);
  border-radius: 50%;
  filter: blur(4px);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.glass-modal h2 {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  margin-bottom: 0.5rem;
}

.glass-modal p {
  color: var(--text-secondary);
  font-size: 0.885rem;
  margin-bottom: 1.75rem;
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background-color: var(--bg-card);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 0%;
  border-radius: 99px;
  transition: width var(--transition-fast);
}

/* --------------------------------------------------------------------------
   21. DRAG OVERLAYS & HIGHLIGHTS
   -------------------------------------------------------------------------- */
.drag-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 9, 14, 0.96);
  backdrop-filter: blur(24px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.drag-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.drag-overlay-content {
  text-align: center;
  color: #ffffff;
  max-width: 400px;
}

.drag-overlay-content h2 {
  font-family: var(--font-heading);
  font-size: 1.95rem;
  margin-top: 1rem;
}

.drag-overlay-content p {
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.pulse-icon {
  width: 68px;
  height: 68px;
  color: var(--primary);
  animation: pulse-icon-anim 2s ease-in-out infinite;
}

@keyframes pulse-icon-anim {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 0px var(--glow-color)); }
  50% { transform: scale(1.1); filter: drop-shadow(0 0 15px var(--glow-color)); }
}

.pdf-card.dragging, .image-card.dragging {
  opacity: 0.35;
  border: 2px dashed var(--primary);
}

.dragenter-highlight {
  border-color: var(--primary) !important;
  background-color: var(--primary-light) !important;
  box-shadow: 0 0 12px var(--primary-light);
}

/* --------------------------------------------------------------------------
   22. TOAST NOTIFICATIONS
   -------------------------------------------------------------------------- */
.toast-notification {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  background: var(--bg-surface-glass);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 0.95rem 1.65rem;
  box-shadow: var(--shadow-xl);
  z-index: 100000;
  animation: slideInUp var(--transition-normal);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.toast-notification.toast-success { border-color: rgba(16, 185, 129, 0.45); }
.toast-notification.toast-success #toast-icon { color: var(--success); }
.toast-notification.toast-error { border-color: rgba(239, 68, 68, 0.45); }
.toast-notification.toast-error #toast-icon { color: var(--danger); }

.toast-content {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.toast-content i { color: var(--primary); width: 22px; height: 22px; }
.toast-content span { font-size: 0.9rem; font-weight: 600; }

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   23. RESPONSIVE MEDIA BREAKPOINTS
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .workspace-layout {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .workspace-controls-sidebar {
    position: relative;
    top: 0;
  }
  .action-group {
    flex-direction: row;
  }
  .action-group button {
    flex: 1;
  }
}

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
  }
  .app-sidebar {
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .nav-group-label {
    display: none;
  }
  .sidebar-footer {
    display: none;
  }
  .main-shell {
    height: auto;
    overflow: visible;
  }
  .shell-main {
    padding: 1.75rem;
  }
}

@media (max-width: 600px) {
  .action-group {
    flex-direction: column;
  }
  .loaded-file-header {
    flex-direction: column;
    gap: 0.85rem;
    align-items: flex-start;
  }
  .pdf-card {
    grid-template-columns: 1fr auto;
    gap: 0.85rem;
  }
  .pdf-preview-box {
    display: none;
  }
}