/* Modern QR Code Generator - CSS Variables and Theme Management */
:root {
  /* Light Theme Colors */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --secondary: #f59e0b;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #f3f4f6;

  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;

  /* Border Colors */
  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
  --border-dark: #9ca3af;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", sans-serif;
  --font-mono: "SF Mono", Monaco, "Fira Code", "Roboto Mono", Consolas, monospace;

  /* Transitions */
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --bg-tertiary: #374151;
  --bg-hover: #4b5563;

  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;

  --border-light: #374151;
  --border-medium: #4b5563;
  --border-dark: #6b7280;

  --primary-light: #1e3a8a;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition), color var(--transition);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--spacing-md);
  background: var(--primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  text-decoration: none;
  z-index: 1000;
  transition: top var(--transition);
  font-weight: 500;
}

.skip-link:focus {
  top: var(--spacing-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;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: var(--spacing-lg) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all var(--transition);
}

[data-theme="dark"] .header {
  background: rgba(17, 24, 39, 0.95);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-icon {
  font-size: 2.5rem;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  font-weight: 500;
}

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

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-secondary);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-secondary);
  position: relative;
  overflow: hidden;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity var(--transition);
}

.theme-toggle:hover::before {
  opacity: 1;
}

.theme-toggle:hover {
  color: white;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.theme-toggle i {
  position: relative;
  z-index: 1;
  font-size: 1.25rem;
  transition: transform var(--transition-slow);
}

.theme-toggle:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

[data-theme="dark"] .theme-toggle i {
  transform: rotate(180deg);
}

/* Main Content */
.main {
  padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  line-height: 1.1;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.5;
}

/* Generator Section */
.generator-section {
  margin-bottom: var(--spacing-2xl);
}

.main-card {
  max-width: 600px;
  margin: 0 auto;
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  border: 1px solid var(--border-light);
}

.card-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: var(--spacing-xl);
  color: white;
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  backdrop-filter: blur(10px);
}

.card-title-section {
  flex: 1;
}

.card-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 var(--spacing-xs) 0;
  color: white;
}

.card-subtitle {
  font-size: 1rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
}

.card-content {
  padding: var(--spacing-xl);
}

/* Form Styles */
.qr-form {
  margin-bottom: var(--spacing-xl);
}

.form-group {
  margin-bottom: var(--spacing-xl);
}

.form-label {
  display: block;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.required {
  color: var(--error);
  margin-left: 2px;
}

.input-wrapper {
  position: relative;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: all var(--transition);
  font-family: inherit;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  transform: translateY(-1px);
  background: var(--bg-primary);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.help-text {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Content Type Indicator */
.content-type-indicator {
  position: absolute;
  right: var(--spacing-lg);
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 600;
  padding: 4px 8px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  pointer-events: none;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

/* Input Validation */
.input-validation {
  margin-top: var(--spacing-sm);
}

.validation-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.validation-indicator.good {
  color: var(--success);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.validation-indicator.warning {
  color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.validation-indicator.error {
  color: var(--error);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Color Picker Group */
.color-picker-group {
  display: flex;
  gap: var(--spacing-lg);
  align-items: end;
  flex-wrap: wrap;
}

.color-input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.color-input-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.color-picker-wrapper {
  position: relative;
  width: 80px;
  height: 50px;
}

.color-input-group input[type="color"] {
  position: absolute;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  background: transparent;
  padding: 0;
  opacity: 0;
}

.color-preview {
  width: 100%;
  height: 100%;
  border: 3px solid var(--border-light);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.color-input-group input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: var(--radius-lg);
}

.reset-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 500;
}

.reset-btn:hover {
  background: var(--border-light);
  color: var(--text-primary);
}

.contrast-indicator {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  text-align: center;
  font-weight: 500;
}

.contrast-indicator.good {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.contrast-indicator.poor {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Form Row */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

@media (max-width: 640px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* Generate Button */
.generate-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.generate-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-hover), var(--secondary));
  opacity: 0;
  transition: opacity var(--transition);
}

.generate-btn:hover::before {
  opacity: 1;
}

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

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

.generate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.generate-btn i {
  position: relative;
  z-index: 1;
}

/* QR Output Section */
.qr-section {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-light);
  text-align: center;
  animation: slideDown 0.3s ease-out;
}

.qr-title {
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.25rem;
}

.qr-display {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  display: inline-block;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.qr-display::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 49%, rgba(255, 255, 255, 0.1) 50%, transparent 51%);
  pointer-events: none;
}

.qr-display canvas,
.qr-display svg,
.qr-display img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  animation: qrFadeIn 0.5s ease-out;
}

@keyframes qrFadeIn {
  0% {
    opacity: 0;
    transform: scale(0.8) rotate(-5deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

@keyframes slideDown {
  0% {
    opacity: 0;
    transform: translateY(-20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* QR Actions */
.qr-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.download-btn,
.copy-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
}

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

.download-btn:hover {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.download-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

.copy-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Social Sharing */
.social-sharing {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
}

.social-sharing h4 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
}

.share-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.share-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.8125rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

.share-btn.whatsapp:hover {
  border-color: #25d366;
  color: #25d366;
}

.share-btn.twitter:hover {
  border-color: #1da1f2;
  color: #1da1f2;
}

.share-btn.email:hover {
  border-color: #ea4335;
  color: #ea4335;
}

.share-btn.copy:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Features Section */
.features-section,
.faq-section {
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--text-primary);
  line-height: 1.2;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: left var(--transition-slow);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
  left: 0;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  display: block;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 0.9375rem;
}

/* FAQ Section */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  gap: var(--spacing-md);
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: var(--spacing-lg);
  background: transparent;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition);
}

.faq-question:hover {
  background: var(--bg-hover);
}

.faq-question:focus {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}

.faq-icon {
  font-size: 1rem;
  transition: transform var(--transition);
  color: var(--primary);
  flex-shrink: 0;
  margin-left: var(--spacing-md);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

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

.faq-answer.active {
  max-height: 300px;
  padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.faq-answer p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
  font-size: 0.9375rem;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

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

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.footer-info h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 600;
}

.footer-info p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
  font-size: 0.9375rem;
}

.footer-links h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  font-weight: 600;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.social-links a {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition);
  font-size: 0.8125rem;
  font-weight: 500;
}

.social-links a:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.social-links a:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.social-links a svg {
  width: 16px;
  height: 16px;
}

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

.footer-bottom p {
  color: var(--text-muted);
  margin: 0;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .header-actions {
    position: static;
  }

  .main-card {
    margin: 0 var(--spacing-md);
  }

  .card-header {
    padding: var(--spacing-lg);
    flex-direction: column;
    text-align: center;
  }

  .card-icon {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
  }

  .card-title {
    font-size: 1.5rem;
  }

  .card-content {
    padding: var(--spacing-lg);
  }

  .color-picker-group {
    justify-content: center;
    gap: var(--spacing-md);
  }

  .qr-actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .share-buttons {
    justify-content: center;
    gap: var(--spacing-xs);
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .social-links {
    justify-content: center;
  }

  .footer-content {
    text-align: center;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .main-card {
    margin: 0 var(--spacing-sm);
  }

  .card-header {
    padding: var(--spacing-md);
  }

  .card-content {
    padding: var(--spacing-md);
  }

  .logo-icon {
    width: 50px;
    height: 50px;
    font-size: 2rem;
  }

  .logo-title {
    font-size: 1.5rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .color-picker-wrapper {
    width: 60px;
    height: 40px;
  }

  .qr-actions {
    gap: var(--spacing-sm);
  }

  .share-buttons {
    gap: var(--spacing-xs);
  }

  .share-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { display: block !important; }

.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }

/* Print Styles */
@media print {
  .header,
  .footer,
  .theme-toggle,
  .qr-actions,
  .social-sharing {
    display: none;
  }

  .main {
    padding: 0;
  }

  .qr-display {
    break-inside: avoid;
  }
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  z-index: 1000;
  max-width: 300px;
  font-weight: 500;
  font-size: 0.875rem;
  display: none;
  animation: slideIn var(--transition) ease-out;
}

.toast.success {
  border-left: 4px solid var(--success);
  background: rgba(16, 185, 129, 0.1);
}

.toast.error {
  border-left: 4px solid var(--error);
  background: rgba(239, 68, 68, 0.1);
}

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

/* Loading States */
.loading {
  opacity: 0.7;
  pointer-events: none;
}

/* Accessibility & Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-contrast: high) {
  :root {
    --border-light: currentColor;
    --border-medium: currentColor;
  }
}

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