/* Enhanced PDF Page Numbering Tool CSS */
:root {
  --primary-color: #4361ee;
  --primary-dark: #3a56cc;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --white: #ffffff;
  --gray-light: #e9ecef;
  --gray-medium: #ced4da;
  --gray-dark: #6c757d;
  --border-radius: 8px;
  --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: #f8fafc;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header Styles */
.header-gradient {
  background: linear-gradient(135deg, var(--primary-color) 0%, #4895ef 100%);
  color: white;
  padding: 1rem 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  margin-top: 1rem;
  box-shadow: var(--box-shadow);
  position: relative;
  overflow: hidden;
}

.header-gradient::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
}

.header-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.header-content h1 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.header-content .subtitle {
  font-size: 1rem;
  opacity: 0.9;
  margin-bottom: 1.5rem;
  font-weight: 400;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.header-badge i {
  margin-right: 0.5rem;
}

/* Tool Container - Side by Side Panels */
.tool-container {
  display: flex;
  gap: 25px;
  margin-bottom: 2.5rem;
  align-items: stretch;
}

/* Panel Styles */
.panel {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  overflow: hidden;
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.panel:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.panel-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--gray-light);
  display: flex;
  align-items: center;
  background-color: #f8fafc;
}

.panel-title {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--dark-color);
}

.panel-title i {
  margin-right: 0.75rem;
  color: var(--primary-color);
  font-size: 1.1em;
}

/* Upload Panel */
.upload-panel {
  min-width: 350px;
}

.upload-section {
  padding: 2rem 1.5rem;
  text-align: center;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.upload-option {
  border: 2px dashed var(--gray-medium);
  border-radius: var(--border-radius);
  padding: 2.5rem 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 1.5rem;
  background-color: #f8fafc;
}

.upload-option:hover {
  border-color: var(--primary-color);
  background-color: rgba(67, 97, 238, 0.03);
  transform: translateY(-2px);
}

.upload-option.dragover {
  border-color: var(--primary-color);
  background-color: rgba(67, 97, 238, 0.05);
}

.upload-icon {
  font-size: 2.75rem;
  color: var(--primary-color);
  margin-bottom: 1.25rem;
  transition: transform 0.3s ease;
}

.upload-option:hover .upload-icon {
  transform: scale(1.1);
}

.upload-text {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

.upload-subtext {
  color: var(--gray-dark);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.file-requirements {
  font-size: 0.85rem;
  color: var(--gray-dark);
  margin-top: auto;
}

.file-requirements i {
  margin-right: 0.25rem;
}

/* File Info Container - Enhanced for long filenames */
.file-info-container {
  display: none;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--gray-light);
  background-color: #f8fafc;
}

.file-preview {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 1rem;
}

.file-preview-icon {
  font-size: 2rem;
  color: var(--danger-color);
  flex-shrink: 0;
}

.file-preview-details {
  flex-grow: 1;
  min-width: 0; /* Crucial for text truncation */
}

.file-preview-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--dark-color);
}

.file-preview-meta {
  display: flex;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: var(--gray-dark);
  flex-wrap: wrap;
}

.file-preview-meta span {
  display: flex;
  align-items: center;
}

.file-preview-meta i {
  margin-right: 0.35rem;
  font-size: 0.9em;
}

/* Options Panel */
.options-container {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.option-tabs {
  display: flex;
  border-bottom: 1px solid var(--gray-light);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  scrollbar-width: none; /* Firefox */
}

.option-tabs::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.option-tab {
  padding: 0.75rem 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: var(--gray-dark);
  position: relative;
  transition: var(--transition);
  white-space: nowrap;
  font-size: 0.95rem;
}

.option-tab:hover {
  color: var(--primary-color);
}

.option-tab.active {
  color: var(--primary-color);
  font-weight: 600;
}

.option-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-color);
}

.option-content {
  display: none;
  flex-grow: 1;
}

.option-content.active {
  display: flex;
  flex-direction: column;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.75rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.75rem;
  font-weight: 500;
  color: var(--dark-color);
  font-size: 0.95rem;
}

.form-group label i {
  margin-right: 0.5rem;
  color: var(--primary-color);
  width: 20px;
  text-align: center;
  font-size: 1.05em;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--gray-medium);
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  transition: var(--transition);
  background-color: var(--white);
  color: var(--dark-color);
}

.form-control:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -12px;
  margin-left: -12px;
}

.form-row .form-group {
  padding-right: 12px;
  padding-left: 12px;
}

.col-md-6 {
  flex: 0 0 50%;
  max-width: 50%;
}

.input-with-unit {
  position: relative;
}

.input-with-unit .unit {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-dark);
  font-size: 0.85rem;
}

.color-picker-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.color-picker-container input[type="color"] {
  width: 45px;
  height: 45px;
  padding: 3px;
  border: 1px solid var(--gray-medium);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

.color-picker-container input[type="color"]:hover {
  transform: scale(1.05);
}

.color-picker-container .color-value {
  font-family: 'Roboto Mono', monospace;
  font-size: 0.9rem;
  color: var(--gray-dark);
  background-color: #f8f9fa;
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
}

.custom-range {
  width: 100%;
  height: 8px;
  -webkit-appearance: none;
  background: var(--gray-light);
  border-radius: 4px;
  outline: none;
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
}

.custom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.custom-range::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.custom-control-input:checked ~ .custom-control-label::before {
  border-color: var(--primary-color);
  background-color: var(--primary-color);
}

/* Position Preview */
.position-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.position-option {
  padding: 1.25rem 0.5rem;
  border: 1px solid var(--gray-medium);
  border-radius: var(--border-radius);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9rem;
}

.position-option:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
}

.position-option.active {
  border-color: var(--primary-color);
  background-color: rgba(67, 97, 238, 0.1);
  color: var(--primary-color);
  font-weight: 500;
  box-shadow: 0 3px 10px rgba(67, 97, 238, 0.1);
}

/* Panel Footer */
.panel-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--gray-light);
  display: flex;
  justify-content: space-between;
  margin-top: auto;
  background-color: #f8fafc;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}

.btn i {
  margin-right: 0.5rem;
  font-size: 1em;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.25);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(67, 97, 238, 0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background-color: #5a6268;
  transform: translateY(-2px);
}

.btn-reset {
  background-color: var(--gray-light);
  color: var(--dark-color);
}

.btn-reset:hover {
  background-color: var(--gray-medium);
  transform: translateY(-2px);
}

.btn-change-file {
  background-color: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
}

.btn-change-file:hover {
  background-color: rgba(67, 97, 238, 0.1);
  transform: translateY(-2px);
}

/* Results Section */
.results-container {
  display: none;
  margin-bottom: 3rem;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  background-color: var(--white);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  box-shadow: var(--box-shadow);
}

.results-title {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 600;
}

.results-title i {
  margin-right: 0.75rem;
  color: var(--success-color);
}

.results-badge {
  background-color: rgba(40, 167, 69, 0.1);
  color: var(--success-color);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
}

.results-content {
  background-color: var(--white);
  padding: 1.5rem;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: var(--box-shadow);
}

.results-preview-container {
  margin-bottom: 2rem;
}

.preview-controls {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.preview-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.preview-page-info {
  font-weight: 500;
  color: var(--dark-color);
}

.preview-zoom {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.zoom-level {
  font-weight: 500;
  width: 50px;
  text-align: center;
  color: var(--dark-color);
}

.preview-wrapper {
  border: 1px solid var(--gray-light);
  border-radius: var(--border-radius);
  overflow: auto;
  max-height: 600px;
  background-color: #f0f0f0;
  text-align: center;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

#pdfPreviewCanvas {
  max-width: 100%;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: opacity 0.3s ease;
}

.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.share-options {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.share-label {
  font-size: 0.9rem;
  color: var(--gray-dark);
}

.btn-share {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

.btn-share:hover {
  transform: translateY(-2px) scale(1.05);
}

.btn-share.email {
  background-color: #dd4b39;
}

.btn-share.drive {
  background-color: #4285F4;
}

.btn-share.dropbox {
  background-color: #0061FF;
}

/* Features Section */
.features-container {
  margin-bottom: 3rem;
}

.section-title {
  text-align: center;
  margin-bottom: 2.5rem;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark-color);
  position: relative;
}

.section-title i {
  margin-right: 0.5rem;
  color: var(--warning-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 1rem;
}

.feature-card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 2rem 1.75rem;
  box-shadow: var(--box-shadow);
  text-align: center;
  transition: var(--transition);
  border-top: 3px solid transparent;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: white;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.feature-icon.security {
  background-color: var(--success-color);
  border-top-color: var(--success-color);
}

.feature-icon.customization {
  background-color: var(--primary-color);
  border-top-color: var(--primary-color);
}

.feature-icon.quality {
  background-color: var(--warning-color);
  border-top-color: var(--warning-color);
}

.feature-icon.speed {
  background-color: var(--danger-color);
  border-top-color: var(--danger-color);
}

.feature-card h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--dark-color);
}

.feature-card p {
  color: var(--gray-dark);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
  background-color: var(--white);
  box-shadow: var(--box-shadow);
  display: flex;
  align-items: center;
  max-width: 350px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  border-left: 4px solid transparent;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast i {
  margin-right: 0.75rem;
  font-size: 1.3rem;
}

.toast.info {
  border-left-color: var(--info-color);
}

.toast.info i {
  color: var(--info-color);
}

.toast.success {
  border-left-color: var(--success-color);
}

.toast.success i {
  color: var(--success-color);
}

.toast.error {
  border-left-color: var(--danger-color);
}

.toast.error i {
  color: var(--danger-color);
}

.toast.warning {
  border-left-color: var(--warning-color);
}

.toast.warning i {
  color: var(--warning-color);
}

.toast-close {
  margin-left: 1rem;
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--gray-dark);
  opacity: 0.7;
  transition: var(--transition);
  line-height: 1;
}

.toast-close:hover {
  opacity: 1;
  color: var(--dark-color);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.loading-content {
  text-align: center;
  max-width: 300px;
  padding: 2rem;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.spinner {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.double-bounce1, .double-bounce2 {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--primary-color);
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
  animation: sk-bounce 2.0s infinite ease-in-out;
}

.double-bounce2 {
  animation-delay: -1.0s;
}

@keyframes sk-bounce {
  0%, 100% { 
    transform: scale(0.0);
  } 50% { 
    transform: scale(1.0);
  }
}

.loading-text {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.loading-progress {
  font-size: 1rem;
  color: var(--gray-dark);
  font-weight: 500;
}

/* Responsive Styles */
@media (max-width: 1200px) {
  .tool-container {
    gap: 20px;
  }
}

@media (max-width: 992px) {
  .tool-container {
    flex-direction: column;
  }
  
  .upload-panel {
    min-width: auto;
  }
  
  .header-content h1 {
    font-size: 1.5rem;
  }
}

@media (max-width: 768px) {
  .header-content h1 {
    font-size: 1.5rem;
  }
  
  .header-content .subtitle {
    font-size: 1rem;
  }
  
  .form-row {
    flex-direction: column;
  }
  
  .form-row .form-group {
    flex: 0 0 100%;
    max-width: 100%;
  }
  
  .position-preview {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .results-actions {
    flex-direction: column;
  }
  
  .share-options {
    margin-left: 0;
    justify-content: center;
    margin-top: 1rem;
  }
  
  .panel-header, .panel-footer {
    padding: 1rem 1.25rem;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 15px;
  }
  
  .header-gradient {
    padding: 1rem 1rem;
  }
  
  .header-content h1 {
    font-size: 1.5rem;
  }
  
  .header-badge {
    font-size: 0.85rem;
  }
  
  .option-tabs {
    gap: 0;
  }
  
  .option-tab {
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
  }
  
  .position-preview {
    grid-template-columns: 1fr;
  }
  
  .results-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .preview-controls {
    flex-direction: column;
    gap: 1rem;
  }
  
  .preview-nav, .preview-zoom {
    width: 100%;
    justify-content: space-between;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* Animation for file upload */
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.uploading-animation {
  animation: pulse 1.5s infinite;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: #c1c1c1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #a8a8a8;
}