/* Suite de herramientas PDF privadas (100% cliente en navegador) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Color Palette - Dark Glassmorphism Premium */
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --bg-glass: rgba(15, 23, 42, 0.75);
  --border-glass: rgba(255, 255, 255, 0.1);
  --border-glass-bright: rgba(56, 189, 248, 0.4);
  
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.3);
  --accent: #818cf8;
  --accent-purple: #c084fc;
  --accent-emerald: #34d399;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  
  --danger: #f43f5e;
  --danger-hover: #e11d48;
  --success: #10b981;
  --warning: #f59e0b;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-glow-purple: 0 0 25px rgba(192, 132, 252, 0.25);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(56, 189, 248, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(192, 132, 252, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(52, 211, 153, 0.05) 0%, transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Header & Navbar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-glass);
  padding: 0.9rem 1.5rem;
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.brand-icon svg {
  width: 24px;
  height: 24px;
  fill: #ffffff;
}

.brand-text h1 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #ffffff 30%, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  font-weight: 400;
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-emerald);
}

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

@keyframes pulse-emerald {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* Main Container */
.main-content {
  flex: 1;
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Dashboard Tools Grid */
.hero-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ffffff 40%, var(--primary) 80%, var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent-purple));
  opacity: 0;
  transition: var(--transition-normal);
}

.tool-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  border-color: var(--border-glass-bright);
  box-shadow: var(--shadow-glow);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: var(--transition-normal);
}

.tool-card:hover .tool-icon-wrapper {
  background: var(--primary);
  color: #0f172a;
}

.tool-icon-wrapper svg {
  width: 26px;
  height: 26px;
  stroke: var(--primary);
  stroke-width: 2;
  fill: none;
  transition: var(--transition-normal);
}

.tool-card:hover .tool-icon-wrapper svg {
  stroke: #0f172a;
}

.tool-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.tool-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  flex: 1;
}

.tool-action-btn {
  margin-top: 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition-fast);
}

.tool-card:hover .tool-action-btn {
  color: #ffffff;
  transform: translateX(4px);
}

/* Tool Active Workspace Panel */
.workspace-panel {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-subtle);
  animation: fadeIn 0.3s ease-out forwards;
}

.workspace-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.workspace-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-glass);
  flex-wrap: wrap;
  gap: 1rem;
}

.workspace-title-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-back {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-back:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-main);
}

.btn-back svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.workspace-title-group h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
}

/* Drag & Drop Zone */
.dropzone {
  border: 2px dashed rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  background: rgba(15, 23, 42, 0.4);
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
}

.dropzone.dragover, .dropzone:hover {
  border-color: var(--primary);
  background: rgba(56, 189, 248, 0.06);
  box-shadow: var(--shadow-glow);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.dropzone-icon svg {
  width: 32px;
  height: 32px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.dropzone h4 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.dropzone p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.dropzone input[type="file"] {
  display: none;
}

/* Common Action Buttons */
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #0f172a;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-danger {
  background: rgba(244, 63, 94, 0.15);
  border: 1px solid rgba(244, 63, 94, 0.3);
  color: var(--danger);
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

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

/* File List Item Cards for Merge */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.file-item {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: var(--transition-fast);
}

.file-item:hover {
  border-color: var(--border-glass-bright);
}

.file-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  overflow: hidden;
}

.file-icon {
  width: 40px;
  height: 40px;
  background: rgba(244, 63, 94, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--danger);
  flex-shrink: 0;
}

.file-icon svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  fill: none;
}

.file-details h5 {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 400px;
}

.file-details p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-sub);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-main);
}

.btn-icon svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

/* Page Thumbnail Grid for Rotate/Split/Organize */
.pages-grid-container {
  margin-top: 1.5rem;
}

.pages-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  background: rgba(15, 23, 42, 0.5);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.pages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1.25rem;
  max-height: 580px;
  overflow-y: auto;
  padding: 0.5rem;
}

.page-card {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  transition: var(--transition-fast);
  user-select: none;
}

.page-card.selected {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
  background: rgba(56, 189, 248, 0.08);
}

.page-card:hover {
  border-color: var(--border-glass-bright);
}

.page-number-badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-glass);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-main);
  z-index: 2;
}

.page-canvas-wrapper {
  width: 100%;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 0.75rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  position: relative;
}

.page-canvas-wrapper canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.page-actions-inline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  width: 100%;
}

/* Signature & Watermark Tool Layout */
.signature-workspace {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

@media (max-width: 900px) {
  .signature-workspace {
    grid-template-columns: 1fr;
  }
}

.signature-preview-area {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
  min-height: 450px;
}

.pdf-page-render-box {
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  border-radius: 6px;
  overflow: hidden;
  background: #ffffff;
}

.draggable-signature-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 2px dashed var(--primary);
  background: rgba(56, 189, 248, 0.15);
  cursor: move;
  padding: 4px;
  border-radius: 4px;
  box-shadow: var(--shadow-glow);
  display: flex;
  align-items: center;
  justify-content: center;
}

.draggable-signature-overlay img {
  max-width: 100%;
  max-height: 100%;
  pointer-events: none;
}

.draggable-signature-overlay .resize-handle {
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  cursor: nwse-resize;
}

.signature-controls-sidebar {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
}

.form-control {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

/* Custom Modal System (Alert replacement) */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: #1e293b;
  border: 1px solid var(--border-glass-bright);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 520px;
  padding: 1.75rem;
  box-shadow: var(--shadow-subtle), var(--shadow-glow);
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-backdrop.active .modal-box {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  margin-bottom: 1.5rem;
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.6;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Canvas Pad for Signature Modal */
.signature-pad-container {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: #ffffff;
  overflow: hidden;
  touch-action: none;
  margin-top: 0.5rem;
}

.signature-pad-container canvas {
  width: 100%;
  height: 220px;
  display: block;
  cursor: crosshair;
}

/* Progress / Loading Overlay */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(56, 189, 248, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

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

.processing-status {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-glass);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.5);
}

.app-footer a {
  color: var(--primary);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* Utilities */
.hidden {
  display: none !important;
}

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

.gap-sm { gap: 0.5rem; }
.gap-md { gap: 1rem; }

/* Responsive adjustments */
@media (max-width: 640px) {
  .hero-title {
    font-size: 1.8rem;
  }
  .workspace-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .dropzone {
    padding: 2.5rem 1rem;
  }
  .tools-grid {
    grid-template-columns: 1fr;
  }
}