/*
 * QRThingsLab - Mobile-First QR Code Generator
 * Main Stylesheet
 * 
 * Deployment: Upload all files to public_html via cPanel File Manager or FTP
 * No build step required - works immediately on any shared hosting
 */

/* ================================
   CSS VARIABLES & THEME
   ================================ */
:root {
  /* Colors - Light Mode */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #06b6d4;
  --accent: #f59e0b;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  
  /* Header height */
  --header-height: 80px;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --border-color: #334155;
  --border-light: #1e293b;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
}

/* ================================
   RESET & BASE
   ================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  transition: background-color var(--transition), color var(--transition);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ================================
   UTILITY CLASSES
   ================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ================================
   HEADER & NAVIGATION
   ================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition), border-color var(--transition);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 3rem;
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
}

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

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.lang-btn:hover {
  background-color: var(--bg-tertiary);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + var(--space-xs));
  right: 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 120px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 1001;
}

.lang-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: background-color var(--transition-fast);
}

.lang-option:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.lang-option:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.lang-option:hover {
  background-color: var(--bg-secondary);
}

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

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
}

/* Mobile Menu Toggle */
.menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.menu-toggle:hover {
  background-color: var(--bg-tertiary);
}

/* Navigation Menu */
.nav-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  padding: var(--space-lg);
  transform: translateX(100%);
  transition: transform var(--transition);
  z-index: 999;
  overflow-y: auto;
}

.nav-menu.active {
  transform: translateX(0);
}

.nav-section {
  margin-bottom: var(--space-xl);
}

.nav-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.nav-list {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--space-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  transition: background-color var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--bg-secondary);
  color: var(--primary);
}

.nav-link i {
  width: 24px;
  text-align: center;
  color: var(--primary);
}

/* ================================
   MAIN CONTENT
   ================================ */
.main {
  padding-top: calc(var(--header-height) + 40px);
  min-height: 100vh;
}

/* ================================
   HERO SECTION
   ================================ */
.hero {
  padding: var(--space-2xl) 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  text-align: center;
}

.hero-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* ================================
   QR TOOLS GRID
   ================================ */
.tools-section {
  padding: var(--space-2xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.section-description {
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.tool-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-fast);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.tool-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.tool-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.tool-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ================================
   QR GENERATOR PAGE
   ================================ */
.generator-page {
  padding: var(--space-xl) 0;
}

.generator-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.generator-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.generator-title i {
  color: var(--primary);
}

.generator-intro {
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.generator-layout {
  display: grid;
  gap: var(--space-xl);
}

/* Form Section */
.form-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.form-label span {
  color: var(--error);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

/* Customization Section */
.customize-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.customize-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.customize-title i {
  color: var(--primary);
}

.color-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.color-input {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 2px;
  background: none;
}

.color-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.range-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.range-input {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background-color: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
}

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

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

.range-value {
  min-width: 50px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Logo Upload */
.logo-upload {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-lg);
  text-align: center;
  transition: border-color var(--transition-fast);
  cursor: pointer;
}

.logo-upload:hover {
  border-color: var(--primary);
}

.logo-upload.has-file {
  border-color: var(--success);
  border-style: solid;
}

.logo-upload-input {
  display: none;
}

.logo-upload-icon {
  font-size: 2rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.logo-upload-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.logo-preview {
  max-width: 80px;
  max-height: 80px;
  margin: 0 auto var(--space-sm);
  border-radius: var(--radius);
}

.logo-remove {
  font-size: 0.75rem;
  color: var(--error);
  margin-top: var(--space-sm);
}

/* Preview Section */
.preview-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
}

.preview-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.preview-title i {
  color: var(--primary);
}

.qr-preview-container {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-preview-placeholder {
  color: var(--text-muted);
  text-align: center;
}

.qr-preview-placeholder i {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

#qr-canvas {
  max-width: 100%;
  height: auto;
}

/* Action Buttons */
.action-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

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

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
}

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

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

.btn-full {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ================================
   AD CONTAINERS
   ================================ */
.ad-container {
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-md);
  text-align: center;
  margin: var(--space-lg) 0;
}

.ad-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.ad-placeholder {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.75rem;
}

.ad-banner-top .ad-placeholder {
  min-height: 50px;
}

.ad-banner-footer .ad-placeholder {
  min-height: 100px;
}

/* ================================
   FAQ SECTION
   ================================ */
.faq-section {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-color);
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question i {
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-content {
  padding-bottom: var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ================================
   RELATED TOOLS
   ================================ */
.related-section {
  padding: var(--space-2xl) 0;
  background-color: var(--bg-secondary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.related-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.related-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.related-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  flex-shrink: 0;
}

.related-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ================================
   BLOG STYLES
   ================================ */
.blog-section {
  padding: var(--space-xl) 0;
}

.blog-grid {
  display: grid;
  gap: var(--space-lg);
}

.blog-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.blog-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.blog-content {
  padding: var(--space-lg);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.blog-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.blog-excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.blog-read-more {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Blog Post Page */
.blog-post {
  padding: var(--space-xl) 0;
}

.blog-post-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.blog-post-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.blog-post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.blog-post-image {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-xl);
}

.blog-post-content {
  max-width: 700px;
  margin: 0 auto;
}

.blog-post-content h2 {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--space-xl) 0 var(--space-md);
}

.blog-post-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--space-lg) 0 var(--space-sm);
}

.blog-post-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.blog-post-content ul,
.blog-post-content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.blog-post-content li {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-xs);
}

/* Table of Contents */
.toc {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.toc-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toc-list {
  list-style: none;
  padding: 0;
}

.toc-item {
  margin-bottom: var(--space-sm);
}

.toc-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.toc-link:hover {
  color: var(--primary);
}

/* Social Share */
.social-share {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.social-share-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-right: var(--space-sm);
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

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

/* ================================
   FOOTER
   ================================ */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-2xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.footer-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
}

.footer-link {
  margin-bottom: var(--space-sm);
}

.footer-link a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ================================
   NOTIFICATIONS
   ================================ */
.notification {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  z-index: 9999;
  opacity: 0;
  transition: all var(--transition);
}

.notification.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

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

.notification.error {
  border-color: var(--error);
}

.notification-icon {
  font-size: 1.25rem;
}

.notification.success .notification-icon {
  color: var(--success);
}

.notification.error .notification-icon {
  color: var(--error);
}

/* ================================
   LOADING SPINNER
   ================================ */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ================================
   BREADCRUMBS
   ================================ */
.breadcrumbs {
  padding: var(--space-md) 0;
  font-size: 0.875rem;
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  list-style: none;
  flex-wrap: wrap;
}

.breadcrumbs-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.breadcrumbs-item:not(:last-child)::after {
  content: '/';
  color: var(--text-muted);
}

.breadcrumbs-link {
  color: var(--text-secondary);
}

.breadcrumbs-link:hover {
  color: var(--primary);
}

.breadcrumbs-current {
  color: var(--text-muted);
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

/* Tablet (768px and up) */
@media (min-width: 768px) {
  :root {
    --header-height: 72px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-description {
    font-size: 1.25rem;
  }
  
  .tools-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .generator-layout {
    grid-template-columns: 1fr 1fr;
  }
  
  .preview-section {
    position: sticky;
    top: calc(var(--header-height) + var(--space-lg));
    height: fit-content;
  }
  
  .related-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
  
  .nav-menu {
    position: static;
    transform: none;
    padding: 0;
    background: none;
  }
  
  .menu-toggle {
    display: none;
  }
  
  .nav-section {
    margin-bottom: 0;
  }
  
  .nav-title {
    display: none;
  }
  
  .nav-list {
    display: flex;
    gap: var(--space-xs);
  }
  
  .nav-item {
    margin-bottom: 0;
  }
  
  .nav-link {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
  }
  
  .nav-link i {
    display: none;
  }
  
  .header-content {
    gap: var(--space-lg);
  }
  
  .header-nav {
    flex: 1;
  }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
  .hero-title {
    font-size: 3rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .generator-title {
    font-size: 2rem;
  }
  
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .blog-post-title {
    font-size: 2.25rem;
  }
}

/* ================================
   PRINT STYLES
   ================================ */
@media print {
  .header,
  .footer,
  .ad-container,
  .action-buttons,
  .nav-menu,
  .menu-toggle,
  .theme-toggle,
  .lang-switcher {
    display: none !important;
  }
  
  .main {
    padding-top: 0;
  }
  
  .qr-preview-container {
    border: 1px solid #000;
    page-break-inside: avoid;
  }
}

/* ================================
   REDUCED MOTION
   ================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
#qr-canvas {
  display: none;
  align-items: center;
  justify-content: center;
  min-height: 256px;
  width: 100%;
}

#qr-canvas img,
#qr-canvas canvas {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

#qr-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 256px;
  text-align: center;
}