/* ==========================================================================
   PageLab PDF Viewer - Application Stylesheet
   Dark theme with green accent design language
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Variables & Global Reset
   -------------------------------------------------------------------------- */

:root {
  --bg-deep: #0a0e17;
  --bg-card: #111827;
  --bg-elevated: #1a2332;
  --accent: #22c55e;
  --accent-dim: #16a34a;
  --accent-glow: rgba(34, 197, 94, 0.12);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #1e293b;
  --border-accent: rgba(34, 197, 94, 0.25);

  /* Supplementary tokens */
  --bg-overlay: rgba(10, 14, 23, 0.85);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-page: 0 2px 16px rgba(0, 0, 0, 0.45);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition-fast: 120ms ease;
  --transition-base: 200ms ease;
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Annotation colors */
  --highlight-yellow: rgba(250, 204, 21, 0.3);
  --highlight-yellow-hover: rgba(250, 204, 21, 0.45);
  --note-pin: var(--accent);
  --drawing-stroke: #ef4444;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-deep);
  overflow: hidden;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', 'DM Sans', sans-serif;
  font-weight: 600;
  line-height: 1.3;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  outline: none;
}

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

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   2. Toolbar
   -------------------------------------------------------------------------- */

#toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  height: 52px;
  padding: 0 12px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border);
  gap: 2px;
  user-select: none;
}

/* Toolbar section groupings */
.toolbar-section {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.toolbar-section + .toolbar-section {
  margin-left: 4px;
}

/* Divider between toolbar sections */
.toolbar-divider {
  width: 1px;
  height: 24px;
  background-color: var(--border);
  margin: 0 6px;
  flex-shrink: 0;
}

/* Logo section */
.toolbar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 8px;
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
}

.toolbar-logo-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 14px;
}

.toolbar-logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* Standard toolbar button */
.tool-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.tool-btn svg,
.tool-btn img {
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.tool-btn:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border);
  color: var(--text-primary);
}

.tool-btn:active {
  transform: scale(0.95);
}

.tool-btn.active {
  background-color: var(--accent-glow);
  border-color: var(--border-accent);
  color: var(--accent);
}

.tool-btn.active:hover {
  background-color: rgba(34, 197, 94, 0.18);
}

/* Disabled toolbar button */
.tool-btn:disabled,
.tool-btn.disabled {
  opacity: 0.35;
  pointer-events: none;
}

/* Toolbar button with text label */
.tool-btn-label {
  width: auto;
  padding: 0 10px;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
}

/* Tooltip on toolbar buttons */
.tool-btn[data-tooltip] {
  position: relative;
}

.tool-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: -32px;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 1010;
}

.tool-btn[data-tooltip]:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Page navigation input */
.page-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.page-nav input {
  width: 40px;
  height: 28px;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.page-nav input:focus {
  border-color: var(--border-accent);
}

.page-nav span {
  color: var(--text-muted);
}

/* Zoom controls */
.zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.zoom-level {
  min-width: 44px;
  text-align: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Export button (primary action) */
.btn-export {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 34px;
  padding: 0 16px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-fast);
  flex-shrink: 0;
}

.btn-export:hover {
  box-shadow: 0 0 16px rgba(34, 197, 94, 0.3);
}

.btn-export:active {
  transform: scale(0.97);
}

.btn-export svg {
  width: 15px;
  height: 15px;
}

/* Spacer to push sections apart */
.toolbar-spacer {
  flex: 1;
  min-width: 8px;
}

/* --------------------------------------------------------------------------
   3. Drop Zone
   -------------------------------------------------------------------------- */

#drop-zone {
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  z-index: 100;
  animation: dropZoneFadeIn 0.4s ease forwards;
}

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

#drop-zone.hidden {
  animation: dropZoneFadeOut 0.25s ease forwards;
  pointer-events: none;
}

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

.drop-zone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 480px;
  width: 100%;
  padding: 60px 40px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-xl);
  background-color: transparent;
  transition:
    border-color var(--transition-smooth),
    background-color var(--transition-smooth);
  text-align: center;
}

#drop-zone.drag-over .drop-zone-inner {
  border-color: var(--accent);
  background-color: var(--accent-glow);
}

.drop-zone-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 24px;
  color: var(--text-muted);
  transition: color var(--transition-base);
}

#drop-zone.drag-over .drop-zone-icon {
  color: var(--accent);
}

.drop-zone-heading {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.drop-zone-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.6;
}

.btn-browse {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.btn-browse:hover {
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.35);
}

.btn-browse:active {
  transform: scale(0.97);
}

/* Hidden file input */
#file-input {
  display: none;
}

/* --------------------------------------------------------------------------
   4. Viewer Container
   -------------------------------------------------------------------------- */

#viewer-container {
  display: none;
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: auto;
  background-color: var(--bg-deep);
  padding: 24px 0;
  z-index: 50;
}

#viewer-container.visible {
  display: block;
}

/* When properties panel is open, shrink the viewer */
#viewer-container.panel-open {
  right: 260px;
  transition: right var(--transition-smooth);
}

/* --------------------------------------------------------------------------
   5. Page Wrapper
   -------------------------------------------------------------------------- */

.page-wrapper {
  position: relative;
  margin: 0 auto 20px;
  box-shadow: var(--shadow-page);
  width: fit-content;
  line-height: 0;
}

.page-wrapper:first-child {
  margin-top: 0;
}

.page-wrapper:last-child {
  margin-bottom: 40px;
}

/* --------------------------------------------------------------------------
   6. PDF Canvas
   -------------------------------------------------------------------------- */

.pdf-canvas {
  display: block;
}

/* Disable text selection on canvas during annotation */
.annotating .pdf-canvas {
  user-select: none;
  -webkit-user-select: none;
}

/* --------------------------------------------------------------------------
   7. Annotation SVG Overlay
   -------------------------------------------------------------------------- */

.annotation-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

/* Enable pointer events when an annotation tool is active */
.tool-active .annotation-layer {
  pointer-events: all;
}

/* --------------------------------------------------------------------------
   8. Annotation Elements
   -------------------------------------------------------------------------- */

/* --- Highlight --- */
.annotation-highlight {
  fill: var(--highlight-yellow);
  stroke: none;
  cursor: pointer;
  transition: fill var(--transition-fast);
}

.annotation-highlight:hover {
  fill: var(--highlight-yellow-hover);
}

/* --- Text Note --- */
.annotation-text-note {
  position: absolute;
  z-index: 20;
  cursor: pointer;
}

.annotation-text-note .note-pin {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--note-pin);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.annotation-text-note .note-pin svg {
  transform: rotate(45deg);
  width: 12px;
  height: 12px;
  color: #fff;
}

.annotation-text-note:hover .note-pin {
  transform: rotate(-45deg) scale(1.1);
  box-shadow: var(--shadow-md);
}

.annotation-text-note .note-content {
  display: none;
  position: absolute;
  top: 28px;
  left: 0;
  min-width: 180px;
  max-width: 260px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.annotation-text-note.expanded .note-content {
  display: block;
  animation: noteExpand 0.2s ease forwards;
}

@keyframes noteExpand {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* --- Drawing --- */
.annotation-drawing {
  fill: none;
  stroke: var(--drawing-stroke);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

/* --- Selected state --- */
.annotation-selected {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* SVG annotation selected (rect-based outline) */
.annotation-selected-rect {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-dasharray: 4 3;
}

/* Resize handles */
.resize-handle {
  width: 8px;
  height: 8px;
  background-color: var(--accent);
  border: 1.5px solid #fff;
  border-radius: 2px;
  position: absolute;
  z-index: 25;
  cursor: nwse-resize;
}

.resize-handle.top-left { top: -4px; left: -4px; cursor: nwse-resize; }
.resize-handle.top-right { top: -4px; right: -4px; cursor: nesw-resize; }
.resize-handle.bottom-left { bottom: -4px; left: -4px; cursor: nesw-resize; }
.resize-handle.bottom-right { bottom: -4px; right: -4px; cursor: nwse-resize; }

/* SVG resize handles */
.svg-resize-handle {
  fill: var(--accent);
  stroke: #fff;
  stroke-width: 1.5;
  cursor: nwse-resize;
}

/* --------------------------------------------------------------------------
   9. Properties Panel
   -------------------------------------------------------------------------- */

#properties-panel {
  position: fixed;
  top: 52px;
  right: 0;
  bottom: 0;
  width: 260px;
  background-color: var(--bg-card);
  border-left: 1px solid var(--border);
  z-index: 900;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
}

#properties-panel.open {
  transform: translateX(0);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.panel-header h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.panel-close-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.panel-body {
  padding: 16px;
}

.panel-section {
  margin-bottom: 20px;
}

.panel-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* Form controls inside properties panel */
.panel-field {
  margin-bottom: 12px;
}

.panel-field label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.panel-field input[type="text"],
.panel-field input[type="number"],
.panel-field textarea,
.panel-field select {
  display: block;
  width: 100%;
  height: 32px;
  padding: 0 10px;
  font-size: 13px;
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.panel-field textarea {
  height: auto;
  min-height: 64px;
  padding: 8px 10px;
  resize: vertical;
}

.panel-field input:focus,
.panel-field textarea:focus,
.panel-field select:focus {
  border-color: var(--border-accent);
}

.panel-field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

/* Color picker */
.panel-field input[type="color"] {
  width: 36px;
  height: 32px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--bg-elevated);
  cursor: pointer;
}

.panel-field input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.panel-field input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

/* Range slider */
.panel-field input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  outline: none;
  border: none;
}

.panel-field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--bg-card);
}

.panel-field input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--bg-card);
}

/* Color + range inline layout */
.panel-field-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-field-row input[type="range"] {
  flex: 1;
}

/* Panel action button */
.panel-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.panel-btn-primary {
  color: #fff;
  background-color: var(--accent);
}

.panel-btn-primary:hover {
  background-color: var(--accent-dim);
}

.panel-btn-secondary {
  color: var(--text-secondary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
}

.panel-btn-secondary:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.panel-btn-danger {
  color: #fca5a5;
  background-color: rgba(239, 68, 68, 0.12);
}

.panel-btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.22);
  color: #fecaca;
}

/* --------------------------------------------------------------------------
   10. Text Note Input Modal
   -------------------------------------------------------------------------- */

#text-note-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  background-color: var(--bg-overlay);
  animation: modalOverlayIn 0.2s ease;
}

#text-note-modal.visible {
  display: flex;
}

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

.modal-card {
  width: 100%;
  max-width: 400px;
  margin: 0 20px;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: modalCardIn 0.25s ease forwards;
}

@keyframes modalCardIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

.modal-header h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.modal-body {
  padding: 20px;
}

.modal-body textarea {
  display: block;
  width: 100%;
  min-height: 100px;
  padding: 10px 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.modal-body textarea:focus {
  border-color: var(--border-accent);
}

.modal-body textarea::placeholder {
  color: var(--text-muted);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px 16px;
}

.modal-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 18px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition:
    background-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.modal-btn-cancel {
  color: var(--text-secondary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
}

.modal-btn-cancel:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.modal-btn-save {
  color: #fff;
  background-color: var(--accent);
}

.modal-btn-save:hover {
  background-color: var(--accent-dim);
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.25);
}

/* --------------------------------------------------------------------------
   11. Toast Notifications
   -------------------------------------------------------------------------- */

.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  min-width: 240px;
  max-width: 360px;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.4;
  pointer-events: all;
  animation: toastSlideIn 0.3s ease forwards;
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.dismissing {
  animation: toastSlideOut 0.25s ease forwards;
}

@keyframes toastSlideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(24px);
  }
}

.toast-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.toast-message {
  flex: 1;
}

.toast-close {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  color: var(--text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.toast-close:hover {
  color: var(--text-primary);
  background-color: var(--bg-elevated);
}

/* Toast variants */
.toast.toast-error {
  border-left-color: #ef4444;
}

.toast.toast-error .toast-icon {
  color: #ef4444;
}

.toast.toast-warning {
  border-left-color: #f59e0b;
}

.toast.toast-warning .toast-icon {
  color: #f59e0b;
}

.toast.toast-info {
  border-left-color: #3b82f6;
}

.toast.toast-info .toast-icon {
  color: #3b82f6;
}

/* --------------------------------------------------------------------------
   12. Scrollbar Styling
   -------------------------------------------------------------------------- */

#viewer-container::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

#viewer-container::-webkit-scrollbar-track {
  background: var(--bg-deep);
}

#viewer-container::-webkit-scrollbar-thumb {
  background: var(--accent-dim);
  border-radius: 4px;
  border: 2px solid var(--bg-deep);
}

#viewer-container::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Firefox scrollbar */
#viewer-container {
  scrollbar-width: thin;
  scrollbar-color: var(--accent-dim) var(--bg-deep);
}

/* Properties panel scrollbar */
#properties-panel::-webkit-scrollbar {
  width: 6px;
}

#properties-panel::-webkit-scrollbar-track {
  background: transparent;
}

#properties-panel::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

#properties-panel::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

#properties-panel {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

/* --------------------------------------------------------------------------
   13. Responsive / Mobile
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
  /* Toolbar becomes horizontally scrollable */
  #toolbar {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    gap: 1px;
    padding: 0 8px;
  }

  /* Hide non-essential toolbar sections on small screens */
  #toolbar::-webkit-scrollbar {
    display: none;
  }

  #toolbar {
    scrollbar-width: none;
  }

  .toolbar-logo-text {
    display: none;
  }

  .toolbar-divider {
    margin: 0 4px;
  }

  .tool-btn {
    width: 34px;
    height: 34px;
    flex-shrink: 0;
  }

  /* Tooltips disabled on mobile */
  .tool-btn[data-tooltip]::after {
    display: none;
  }

  .btn-export {
    padding: 0 12px;
    height: 32px;
    font-size: 12px;
  }

  .btn-export span {
    display: none;
  }

  /* Properties panel becomes bottom sheet */
  #properties-panel {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-height: 50vh;
    border-left: none;
    border-top: 1px solid var(--border);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transform: translateY(100%);
  }

  #properties-panel.open {
    transform: translateY(0);
  }

  /* Viewer doesn't shrink for panel on mobile */
  #viewer-container.panel-open {
    right: 0;
    bottom: 50vh;
  }

  /* Drop zone compact */
  .drop-zone-inner {
    padding: 40px 24px;
  }

  .drop-zone-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
  }

  .drop-zone-heading {
    font-size: 18px;
  }

  .drop-zone-subtitle {
    font-size: 13px;
    margin-bottom: 20px;
  }

  /* Toast full width on mobile */
  .toast-container {
    left: 12px;
    right: 12px;
    bottom: 12px;
  }

  .toast {
    max-width: none;
    width: 100%;
    min-width: 0;
  }
}

@media (max-width: 480px) {
  .page-nav input {
    width: 32px;
  }

  .zoom-level {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   14. Cursor Styles
   -------------------------------------------------------------------------- */

/* Select tool (default) */
.tool-select #viewer-container {
  cursor: default;
}

/* Highlight tool */
.tool-highlight #viewer-container {
  cursor: crosshair;
}

.tool-highlight .annotation-layer {
  cursor: crosshair;
}

/* Drawing tool */
.tool-draw #viewer-container {
  cursor: crosshair;
}

.tool-draw .annotation-layer {
  cursor: crosshair;
}

/* Text note tool */
.tool-text-note #viewer-container {
  cursor: text;
}

.tool-text-note .annotation-layer {
  cursor: text;
}

/* Grab/pan when scrolling */
.tool-select #viewer-container:active {
  cursor: grab;
}

/* --------------------------------------------------------------------------
   15. Loading Spinner
   -------------------------------------------------------------------------- */

.loading-overlay {
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  bottom: 0;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  z-index: 500;
  background-color: var(--bg-deep);
}

.loading-overlay.visible {
  display: flex;
}

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

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

.loading-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

/* Small inline spinner variant */
.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
  border-color: var(--text-muted);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

/* --------------------------------------------------------------------------
   16. Utility Classes
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.text-accent {
  color: var(--accent);
}

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

/* --------------------------------------------------------------------------
   17. Print Styles
   -------------------------------------------------------------------------- */

@media print {
  #toolbar,
  #properties-panel,
  .toast-container,
  #text-note-modal,
  .loading-overlay,
  #drop-zone {
    display: none !important;
  }

  body {
    background-color: #fff;
    overflow: visible;
  }

  #viewer-container {
    position: static;
    overflow: visible;
    background-color: #fff;
    padding: 0;
  }

  .page-wrapper {
    box-shadow: none;
    margin: 0;
    page-break-after: always;
  }

  .annotation-highlight {
    fill: rgba(250, 204, 21, 0.3);
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
}