:root {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-sidebar: #1e293b;
  --border-color: #334155;
  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;
  --accent-success: #10b981;
  --accent-danger: #ef4444;
  --accent-warning: #f59e0b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --canvas-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  width: 100%;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: #ffffff;
}

.logo-container i {
  color: var(--accent-primary);
  font-size: 1.5rem;
}

.badge-local {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--accent-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Main Layout */
.app-container {
  display: flex;
  flex: 1;
  height: calc(100vh - 61px);
  position: relative;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  z-index: 10;
}

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

.sidebar-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Thumbnails list */
.thumbnails-container {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Sidebar Footer (Author Info) - Always visible at bottom */
.sidebar-footer {
  flex-shrink: 0;
  margin-top: auto;
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border-color);
  background-color: rgba(15, 23, 42, 0.95);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  z-index: 5;
}

.sidebar-footer .author-name {
  color: var(--text-main);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
}

.visit-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background-color: rgba(59, 130, 246, 0.18);
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.4);
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
}

.visit-badge:hover {
  background-color: var(--accent-primary);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

.sidebar-footer .author-name i {
  color: var(--accent-primary);
}

.sidebar-footer .author-link {
  color: var(--accent-primary);
  text-decoration: none;
  font-size: 0.78rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: color 0.2s;
}

.sidebar-footer .author-link:hover {
  text-decoration: underline;
  color: var(--accent-primary-hover);
}

.thumbnail-item {
  position: relative;
  border: 2px solid transparent;
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  background-color: #0f172a;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem;
}

.thumbnail-item.active {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4);
}

.thumbnail-item canvas {
  max-width: 100%;
  height: auto;

  display: block;
}

.thumbnail-page-number {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  font-weight: 600;
}

/* Signatures section in sidebar */
.signature-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 240px;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.signature-item {
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  cursor: pointer;
  transition: border-color 0.2s;
}

.signature-item:hover {
  border-color: var(--accent-primary);
}

.signature-preview-img {
  max-height: 40px;
  max-width: 120px;
  object-fit: contain;
  background-color: #ffffff;
  padding: 2px;
  border-radius: 4px;
}

.signature-item-actions {
  display: flex;
  gap: 0.35rem;
}

/* Main Content Area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: #090d16;
  position: relative;
  overflow: hidden;
}

/* Toolbar */
.toolbar {
  position: sticky;
  top: 0;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0.6rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  z-index: 50;
  width: 100%;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background-color: var(--border-color);
  margin: 0 0.25rem;
}

/* Canvas Viewport */
.viewport-container {
  flex: 1;
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem;
  position: relative;
}

.drop-zone-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
  z-index: 10;
  background-color: var(--bg-main);
}

.upload-card {
  background-color: var(--bg-card);
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  max-width: 500px;
  width: 100%;
  transition: all 0.3s ease;
  cursor: pointer;
}

.upload-card:hover, .upload-card.dragover {
  border-color: var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.05);
}

.upload-icon {
  font-size: 3.5rem;
  color: var(--accent-primary);
  margin-bottom: 1rem;
}

/* Draw Canvas Overlay */
.draw-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  pointer-events: none;
  touch-action: none;
}

.draw-canvas.active {
  z-index: 20;
  pointer-events: auto;
  cursor: crosshair;
}

/* Color & Size Pickers in Toolbar */
.draw-color-picker {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.draw-color-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s, border-color 0.15s;
}

.draw-color-dot.active {
  border-color: #ffffff;
  transform: scale(1.25);
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.4);
}

.draw-size-picker {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.btn-xs {
  padding: 0.2rem 0.45rem;
  font-size: 0.72rem;
  border-radius: 4px;
}

.btn-xs.active {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

/* PDF Page Wrapper and Overlay Canvas */
.page-container {
  position: relative;
  box-shadow: var(--canvas-shadow);
  background-color: #ffffff;
  border-radius: 4px;
  margin: 0 auto 2rem auto;
  user-select: none;
}

.pdf-canvas {
  display: block;
}

.pdf-text-layer {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  line-height: 1;
  pointer-events: auto;
  z-index: 2;
}

.pdf-text-item {
  position: absolute;
  color: transparent;
  cursor: text;
  white-space: pre;
  transform-origin: 0% 0%;
  box-sizing: border-box;
  user-select: text;
  border: 1px dashed transparent;
  transition: background-color 0.15s, border-color 0.15s;
}

.pdf-text-item:hover {
  background-color: rgba(59, 130, 246, 0.18);
  border-color: var(--accent-primary);
  border-radius: 2px;
}

.annotation-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* children enable pointer events */
  z-index: 5;
}

/* Overlay elements (signatures & text placed on canvas) */
.placed-element {
  position: absolute;
  pointer-events: auto;
  cursor: move;
  border: 1px dashed transparent;
  padding: 2px;
  box-sizing: border-box;
  display: inline-block;
  user-select: none;
  touch-action: none;
}

.placed-element.selected {
  border-color: var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.08);
}

.placed-element.bg-white {
  background-color: #ffffff !important;
}

.placed-element.whiteout-box {
  background-color: #ffffff;
  border: 1px dashed #94a3b8;
  min-width: 30px;
  min-height: 15px;
}

.placed-element.whiteout-box.selected {
  border-color: var(--accent-primary);
}

.placed-element img {
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

.placed-text-content {
  font-family: sans-serif;
  color: #000000;
  white-space: pre-wrap;
  word-break: break-word;
  outline: none;
  min-width: 50px;
  min-height: 20px;
  padding: 1px 2px;
}

.placed-text-content * {
  font-size: inherit !important;
  color: inherit !important;
  font-family: inherit !important;
  background: transparent !important;
  font-weight: inherit !important;
  font-style: inherit !important;
  text-decoration: inherit !important;
}

/* Layers Panel (Photoshop style) */
.layers-container {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  overflow-y: auto;
  flex: 1;
  padding-right: 0.2rem;
}

.layer-item {
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.layer-item:hover {
  border-color: var(--accent-primary);
}

.layer-item.active-layer {
  border-color: var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.12);
}

.layer-item.hidden-layer {
  opacity: 0.5;
  background-color: rgba(15, 23, 42, 0.4);
}

.layer-eye-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 4px;
  font-size: 0.85rem;
  transition: color 0.15s;
}

.layer-eye-btn:hover {
  color: var(--text-main);
}

.layer-eye-btn.visible {
  color: var(--accent-primary);
}

.layer-info {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 1;
  min-width: 0;
}

.layer-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.layer-actions {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

/* Grid Overlay (Malla) */
.grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 4;
  display: none;
  background-size: 20px 20px;
  background-image: 
    linear-gradient(to right, rgba(59, 130, 246, 0.18) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(59, 130, 246, 0.18) 1px, transparent 1px);
}

.grid-overlay.active {
  display: block;
}

/* Margins Overlay (Márgenes de Impresión) */
.margins-overlay {
  position: absolute;
  top: 40px;
  left: 40px;
  right: 40px;
  bottom: 40px;
  pointer-events: none;
  z-index: 4;
  display: none;
  border: 1px dashed rgba(239, 68, 68, 0.7);
  background-color: rgba(239, 68, 68, 0.02);
}

.margins-overlay::before {
  content: 'Margen de impresión (15mm)';
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 0.65rem;
  color: var(--accent-danger);
  font-family: sans-serif;
  font-weight: 600;
}

.margins-overlay.active {
  display: block;
}

/* Rulers (Reglas en Bordes) */
.viewport-container.has-rulers {
  padding-top: 2.2rem;
  padding-left: 2.2rem;
}

.ruler-corner {
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 28px;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  z-index: 40;
}

.ruler-horizontal {
  position: absolute;
  top: 0;
  left: 28px;
  right: 0;
  height: 28px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
  z-index: 35;
  user-select: none;
}

.ruler-vertical {
  position: absolute;
  top: 28px;
  left: 0;
  bottom: 0;
  width: 28px;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  overflow: hidden;
  z-index: 35;
  user-select: none;
}

.ruler-tick {
  position: absolute;
  background-color: var(--text-muted);
  font-size: 0.62rem;
  color: var(--text-muted);
}

/* Placed Image Styles */
.placed-element.type-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  display: block;
}
.placed-table-container {
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: #ffffff;
}

.placed-table {
  width: 100%;
  height: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-family: sans-serif;
  font-size: 0.85rem;
}

.placed-table th {
  background-color: #1e293b;
  color: #ffffff;
  border: 1px solid #475569;
  padding: 4px 6px;
  text-align: left;
  font-weight: 600;
  outline: none;
}

.placed-table td {
  border: 1px solid #94a3b8;
  padding: 4px 6px;
  background-color: #ffffff;
  color: #000000;
  outline: none;
}

.placed-shape-svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}

/* Resize & Controls Handles on Placed Element */
.element-controls {
  position: absolute;
  top: -36px;
  left: 0;
  display: none;
  gap: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 3px 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  z-index: 100;
  white-space: nowrap;
}

.placed-element.selected .element-controls {
  display: flex;
}

.element-btn {
  background: transparent;
  border: none;
  color: var(--text-main);
  padding: 2px 6px;
  font-size: 0.75rem;
  border-radius: 3px;
  cursor: pointer;
}

.element-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.element-btn.delete:hover {
  background-color: var(--accent-danger);
  color: #ffffff;
}

.resize-handle {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: var(--accent-primary);
  border: 1px solid #ffffff;
  border-radius: 50%;
  bottom: -5px;
  right: -5px;
  cursor: se-resize;
  display: none;
}

.placed-element.selected .resize-handle {
  display: block;
}

/* UI Controls & Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-main);
  background-color: var(--bg-card);
}

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

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

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--text-muted);
}

.btn-success {
  background-color: var(--accent-success);
  color: #ffffff;
}

.btn-success:hover {
  background-color: #059669;
}

.btn-warning {
  background-color: #f97316;
  color: #ffffff;
  border-color: #ea580c;
}

.btn-warning:hover {
  background-color: #ea580c;
}

.btn-danger {
  background-color: var(--accent-danger);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-icon {
  padding: 0.5rem;
  width: 36px;
  height: 36px;
  border-radius: 6px;
}

.btn-sm {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

/* Template Selection Grid */
.template-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-height: 75vh;
  overflow-y: auto;
  padding-right: 0.25rem;
}

@media (max-width: 900px) {
  .template-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 500px) {
  .template-grid {
    grid-template-columns: 1fr;
  }
}

.template-card {
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.template-card:hover {
  border-color: var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px -4px rgba(59, 130, 246, 0.2);
}

.template-icon {
  font-size: 2.2rem;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.template-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.template-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.modal-backdrop.show {
  opacity: 1;
  pointer-events: auto;
  z-index: 5000;
}

.modal-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 90%;
  max-width: 600px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background-color: rgba(0, 0, 0, 0.1);
}

/* Signature Drawing Canvas */
.signature-canvas-container {
  background-color: #ffffff;
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  height: 220px;
  position: relative;
  overflow: hidden;
  touch-action: none;
}

.signature-canvas-container canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

.signature-tools {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.color-picker-group, .width-picker-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.color-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s;
}

.color-dot.active {
  border-color: #ffffff;
  transform: scale(1.15);
}

/* Toast notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 2000;
}

.toast {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-left: 4px solid var(--accent-primary);
  padding: 0.75rem 1.25rem;
  border-radius: 6px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  animation: slideIn 0.3s ease forwards;
}

.toast.success { border-left-color: var(--accent-success); }
.toast.danger { border-left-color: var(--accent-danger); }
.toast.info { border-left-color: var(--accent-primary); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Form inputs */
.form-input {
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  outline: none;
  width: 100%;
}

.form-input:focus {
  border-color: var(--accent-primary);
}