/* CSS Variables */
:root {
  /* Colors */
  --primary: #b5179e;
  --primary-dark: #4361ee;
  --primary-light: #E0E7FF;
  --surface: #FFFFFF;
  --background: #F9FAFB;
  --error: #EF4444;
  --success: #10B981;
  --text-primary: #111827;
  --text-secondary: #6B7280;
  
  /* Layout */
  --border-radius: 16px;
  --border-radius-sm: 12px;
  --border-radius-lg: 24px;
  --spacing: 16px;
  --spacing-sm: 8px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  
  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Z-index layers */
  --z-base: 1;
  --z-header: 100;
  --z-footer: 999;
  --z-overlay: 9999;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', 'Roboto', sans-serif;
  background: linear-gradient(135deg, #F9FAFB 0%, #E0E7FF 100%);
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 80px;
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header Styles */
.app-header {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  padding: var(--spacing-sm) var(--spacing);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.app-header h1 {
  font-size: 2.25rem;
  font-weight: 600;
  margin: 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-wrapper {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-bottom: var(--spacing-sm);
}

.header-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.app-logo {
  height: 60px;
  width: auto;
}

/* Steps Indicator */
.steps-indicator {
  display: flex;
  justify-content: center;
  gap: var(--spacing);
  position: relative;
  padding: var(--spacing-sm) 0 0;
}

.steps-indicator::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  height: 2px;
  width: 80%;
  background: var(--primary-light);
  z-index: -1;
}

.step {
  background: var(--surface);
  color: var(--text-secondary);
  padding: var(--spacing-sm) var(--spacing);
  border-radius: var(--border-radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow-sm);
}

.step i {
  font-size: 1.1rem;
}

.step.active {
  background: var(--primary);
  color: var(--surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Main Content */
.app-content {
  flex: 1;
  padding: var(--spacing);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.step-section {
  display: none;
  animation: fadeIn var(--transition);
}

.step-section.active {
  display: block;
}

/* Upload Area */
.upload-area {
  background: var(--surface);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.upload-dropzone {
  border: 2px dashed var(--primary-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg) var(--spacing-md);
  transition: var(--transition);
  cursor: pointer;
  background: rgba(79, 70, 229, 0.02);
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.05);
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.upload-dropzone i {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: var(--spacing);
}

/* File Info */
.file-info {
  background: var(--surface);
  padding: var(--spacing);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing);
}

.file-preview {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.file-preview i {
  color: var(--primary);
  font-size: 1.5rem;
}

.filename {
  font-size: 0.875rem;
  color: var(--text-primary);
  word-break: break-all;
}

/* Error Message */
.error-message {
  color: var(--error);
  background: rgba(255, 82, 82, 0.1);
  padding: var(--spacing-sm) var(--spacing);
  border-radius: var(--border-radius-sm);
  margin-top: var(--spacing);
  animation: slideIn var(--transition);
}

/* Option Cards */
.options-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.option-card {
  background: var(--surface);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: var(--shadow-sm);
}

.option-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.option-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: var(--spacing);
  display: flex;
  align-items: center;
  gap: 12px;
  color: white;
}

.option-content {
  padding: 24px;
}

/* Buttons */
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--surface);
  border: none;
  padding: 12px 24px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  pointer-events: auto;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-primary:disabled {
  background: var(--text-secondary);
  cursor: not-allowed;
  opacity: 0.7;
  transform: none;
  box-shadow: none;
}

.btn-text {
  background: none;
  border: none;
  color: var(--primary);
  padding: 12px 24px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-text::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: var(--transition);
  transform-origin: right;
}

.btn-text:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Controls */
.toggle-group {
  display: flex;
  gap: var(--spacing-sm);
}

.toggle {
  flex: 1;
  position: relative;
}

.toggle input {
  display: none;
}

.toggle span {
  display: block;
  padding: var(--spacing-sm) var(--spacing);
  text-align: center;
  background: var(--background);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.toggle input:checked + span {
  background: var(--primary);
  color: var(--surface);
}

.switch {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing);
}

.range-control {
  display: flex;
  align-items: center;
  gap: var(--spacing);
}

.range-control input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  background: var(--primary-light);
  border-radius: 2px;
  outline: none;
}

.range-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}

.range-control input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.step-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing);
  margin-top: var(--spacing-md);
}

/* Preview Container and Controls */
.preview-container {
  background: var(--surface);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  z-index: var(--z-base);
}

.preview-toolbar {
  padding: var(--spacing);
  border-bottom: 1px solid var(--background);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
}

.page-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing);
}

.page-controls button {
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-controls button:hover {
  background: rgba(33, 150, 243, 0.08);
}

.page-controls button:disabled {
  color: var(--text-secondary);
  cursor: not-allowed;
}

.page-controls span {
  color: var(--text-primary);
  font-weight: 500;
}

.preview-canvas {
  padding: var(--spacing-md);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background);
}

#previewCanvas {
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  display: block;
}

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

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

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Loading Overlay */
#loadingOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: var(--z-overlay);
}

.loading-container {
  background-color: var(--surface);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 80%;
  width: 400px;
  animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--primary-light);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

#loadingText {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.125rem;
  font-weight: 500;
}

#loadingProgress {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--primary-light);
  border-radius: var(--border-radius-sm);
  margin-top: var(--spacing);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-dark) 100%);
  width: 0%;
  transition: width var(--transition);
}

/* Footer */
.app-footer {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  padding: var(--spacing) var(--spacing);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  box-shadow: var(--shadow-sm);
  margin-top: auto;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-footer);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.app-footer .heart {
  color: #EF4444;
  display: inline-block;
  animation: heartbeat 1.5s ease infinite;
}

@keyframes heartbeat {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

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

.app-footer a:hover {
  color: var(--primary-dark);
}

/* Feedback & Social Buttons */
.feedback-button {
  position: fixed;
  bottom: 60px;
  left: 20px;
  z-index: var(--z-footer);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 12px 20px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--surface);
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  font-weight: 500;
}

.feedback-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feedback-button i {
  font-size: 1.25rem;
}

.social-buttons {
  position: fixed;
  left: 20px;
  bottom: 115px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: var(--z-footer);
}

.social-button {
  width: 45px;
  height: 45px;
  border-radius: var(--border-radius-sm);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--surface);
  font-size: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.social-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.social-button.instagram {
  background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

.social-button.telegram {
  background: linear-gradient(135deg, #0088cc 0%, #0072a8 100%);
}

/* Responsive Styles */
@media (max-width: 768px) {
  .steps-indicator {
    gap: var(--spacing);
  }
  
  .step {
    padding: var(--spacing-sm) var(--spacing-sm);
    font-size: 0.75rem;
  }
  
  .step i {
    font-size: 1rem;
  }
  
  .app-header {
    padding: var(--spacing-sm) var(--spacing-sm);
  }
  
  .app-header h1 {
    font-size: 2rem;
  }
  
  .app-logo {
    height: 60px;
  }
  
  .upload-area {
    padding: var(--spacing);
  }
  
  .upload-dropzone {
    padding: var(--spacing-md) var(--spacing);
  }
  
  .upload-dropzone i {
    font-size: 2.25rem;
  }
  
  .options-grid {
    grid-template-columns: 1fr;
  }
  
  .file-info {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .preview-toolbar {
    padding: var(--spacing-sm);
  }
  
  .page-controls {
    width: 100%;
    justify-content: space-between;
    padding: var(--spacing-sm);
  }
  
  .page-controls span {
    min-width: 90px;
    font-size: 0.875rem;
  }
  
  .preview-container {
    min-height: 400px;
  }
  
  .preview-canvas {
    padding: var(--spacing-sm);
  }
  
  .loading-container {
    margin: var(--spacing);
    padding: var(--spacing);
  }
  
  .feedback-button {
    border-radius: var(--border-radius-lg);
  }
  
  .feedback-button span {
    display: inline;
  }
  
  .layout-options {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .page-controls {
    gap: var(--spacing-sm);
  }
  
  .page-controls span {
    min-width: 80px;
    font-size: 0.75rem;
  }
  
  .preview-container {
    min-height: 300px;
  }
  
  .layout-options {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }
  
  .app-header h1 {
    font-size: 1.5rem;
  }
  
  .app-logo {
    height: 45px;
  }
}

/* Utility Classes */
.hidden {
  display: none !important;
  visibility: hidden;
}

/* Layout Options */
.layout-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing);
}

.layout-option {
  border: 2px solid #EEF2FF;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.layout-option input[type="radio"] {
  position: absolute;
  opacity: 0;
}

.layout-option:hover {
  border-color: var(--primary-light);
  background: rgba(79, 70, 229, 0.02);
  transform: translateY(-2px);
}

.layout-option.active {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.05);
  transform: translateY(-3px);
}

.layout-preview {
  width: 80px;
  height: 80px;
  background: white;
  border: 1px solid #ddd;
  margin: 0 auto var(--spacing-sm);
  display: grid;
  gap: 2px;
  padding: 2px;
  border-radius: 4px;
}

.layout-option.active .layout-preview {
  border-color: var(--primary);
}

.layout-preview.single-up {
  grid-template-columns: 1fr;
}

.layout-preview.two-up {
  grid-template-columns: 1fr 1fr;
}

.layout-preview.four-up {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.layout-preview.six-up {
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.upload-progress {
  margin-top: var(--spacing);
  height: 6px;
  background: #EEF2FF;
  border-radius: 3px;
  overflow: hidden;
  transition: var(--transition);
}

.upload-progress-bar {
  height: 100%;
  background: var(--primary);
  width: 0;
  transition: width 0.3s ease;
}

.header-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.2s ease;
}

.header-link:hover {
  opacity: 0.9;
}