/* ==========================================================================
   DigFirma - Modern Design System (Vanilla CSS & Glassmorphism)
   ========================================================================== */

@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 {
  /* Color Palette - Dark Theme Default */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-active: rgba(99, 102, 241, 0.5);

  --accent-primary: #6366f1; /* Electric Indigo */
  --accent-hover: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-heading: 'Outfit', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Support */
body.light-theme {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(241, 245, 249, 0.95);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-active: rgba(99, 102, 241, 0.6);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);
}

/* Reset & Global Elements */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.1) 0%, transparent 40%);
  background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* App Header & Navbar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  box-shadow: var(--shadow-glow);
}

.brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.light-theme .brand-title {
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.7rem;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Glass Buttons */
.btn {
  font-family: var(--font-heading);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-active);
}

.btn-emerald {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #fff;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}
.btn-emerald:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.5);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
  background: #ef4444;
  color: #ffffff;
}

.btn-icon-only {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Stepper Wizard Bar */
.wizard-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 2rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.step-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
  opacity: 0.5;
  transition: var(--transition);
}

.step-item.active {
  opacity: 1;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.step-item.active .step-number {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.step-label {
  font-weight: 600;
  font-size: 0.95rem;
}

.step-divider {
  width: 40px;
  height: 2px;
  background: var(--border-color);
}

/* Main Layout Grid */
.main-container {
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.workspace-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 1.5rem;
}

.glass-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.glass-card-title {
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Upload Dropzone */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.02);
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.05);
}

.dropzone-icon {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.dropzone-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.dropzone-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Canvas / PDF Workspace */
.canvas-wrapper {
  position: relative;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  min-height: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  overflow: auto;
}

.pdf-viewport-container {
  position: relative;
  box-shadow: var(--shadow-lg);
  margin: 0 auto;
  user-select: none;
}

#pdfCanvas {
  display: block;
  background: #ffffff;
  border-radius: 4px;
}

/* Overlay Layer for Signatures */
.signature-overlay-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.signature-stamp-element {
  position: absolute;
  pointer-events: auto;
  cursor: move;
  border: 2px dashed transparent;
  transition: border-color 0.15s ease;
  user-select: none;
}

.signature-stamp-element.selected {
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

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

/* Controls box on stamp element */
.stamp-controls {
  position: absolute;
  top: -35px;
  right: 0;
  display: none;
  gap: 0.35rem;
  background: rgba(15, 23, 42, 0.9);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  z-index: 12;
}

.signature-stamp-element.selected .stamp-controls {
  display: flex;
}

.stamp-btn {
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}
.stamp-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* 4 Corner Resize Handles */
.resize-handle {
  position: absolute;
  width: 10px;
  height: 10px;
  background: var(--accent-primary);
  border: 1.5px solid #ffffff;
  border-radius: 2px;
  display: none;
  z-index: 15;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
}

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

.resize-handle.nw { top: -5px; left: -5px; cursor: nwse-resize; }
.resize-handle.ne { top: -5px; right: -5px; cursor: nesw-resize; }
.resize-handle.sw { bottom: -5px; left: -5px; cursor: nesw-resize; }
.resize-handle.se { bottom: -5px; right: -5px; cursor: nwse-resize; }

/* Form Controls & Range Sliders */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.range-slider {
  width: 100%;
  accent-color: var(--accent-primary);
  cursor: pointer;
}

/* Signature Gallery Thumbnails */
.signature-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.sig-thumb-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  text-align: center;
}

.sig-thumb-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.sig-thumb-del-btn {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 22px;
  height: 22px;
  background: #ef4444;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: var(--transition);
  z-index: 10;
}

.sig-thumb-card:hover .sig-thumb-del-btn {
  opacity: 1;
}

.sig-thumb-del-btn:hover {
  background: #dc2626;
  transform: scale(1.15);
}

.eraser-active canvas {
  cursor: crosshair !important;
}

/* Options for preview background contrast */
.preview-bg-grid {
  background-image: 
    linear-gradient(45deg, #2a2d3d 25%, transparent 25%), 
    linear-gradient(-45deg, #2a2d3d 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #2a2d3d 75%), 
    linear-gradient(-45deg, transparent 75%, #2a2d3d 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

.preview-bg-white {
  background: #ffffff !important;
}

.preview-bg-yellow {
  background: #fef08a !important; /* Soft high-contrast yellow paper */
}

/* Eraser Brush Ring Indicator */
.eraser-cursor-ring {
  position: absolute;
  pointer-events: none;
  border: 2px solid #ef4444;
  background: rgba(239, 68, 68, 0.15);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 50;
  display: none;
}

.sig-thumb-img {
  max-width: 100%;
  max-height: 70px;
  object-fit: contain;
  background-image: 
    linear-gradient(45deg, #ccc 25%, transparent 25%), 
    linear-gradient(-45deg, #ccc 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #ccc 75%), 
    linear-gradient(-45deg, transparent 75%, #ccc 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
  border-radius: 4px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

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

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: translateY(20px);
  transition: transform 0.25s ease;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}
.modal-close:hover {
  color: var(--text-main);
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  max-width: 800px;
  width: 92%;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  z-index: 900;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .cookie-banner {
    flex-direction: column;
    text-align: center;
  }
}

.cookie-text {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.cookie-text a {
  color: var(--accent-primary);
  text-decoration: none;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-main);
  animation: slideInRight 0.3s forwards;
}

.toast-success { border-left: 4px solid var(--accent-emerald); }
.toast-error { border-left: 4px solid #ef4444; }

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

/* Utility Transparency Background Grid */
.transparency-grid {
  background-image: 
    linear-gradient(45deg, #2a2d3d 25%, transparent 25%), 
    linear-gradient(-45deg, #2a2d3d 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #2a2d3d 75%), 
    linear-gradient(-45deg, transparent 75%, #2a2d3d 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}