/* ============================================
   Professional Carbon Footprint Analyzer CSS
   Modern Design with Gradients & Animations
   ============================================ */

:root {
  /* Color Palette */
  --primary: #10b981;
  --primary-dark: #059669;
  --primary-light: #34d399;
  --secondary: #3b82f6;
  --accent: #8b5cf6;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
  
  /* Neutrals */
  --bg-primary: #f9fafb;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f3f4f6;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --gradient-hero: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.7));
  
  /* 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;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --bg-tertiary: #374151;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --border: #374151;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  --gradient-card: linear-gradient(145deg, rgba(31,41,55,0.9), rgba(31,41,55,0.7));
}

[data-theme="dark"] .extension-card-preview {
  background: var(--bg-secondary);
}

[data-theme="dark"] .browser-content {
  background: var(--bg-primary);
}

[data-theme="dark"] .ext-info h4 {
  color: var(--text-primary);
}

[data-theme="dark"] .ext-info p {
  color: var(--text-secondary);
}

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

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  -webkit-touch-callout: none;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  touch-action: manipulation;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* Navigation */
.navbar {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-brand i {
  font-size: 1.75rem;
  color: var(--primary);
  -webkit-text-fill-color: initial;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(16, 185, 129, 0.1);
}

.nav-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 44px;  /* Touch-friendly minimum */
  height: 44px; /* Touch-friendly minimum */
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

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

.icon-btn:active {
  transform: translateY(0) scale(0.95);
}

/* Hero Section */
.hero {
  background: var(--gradient-hero);
  padding: var(--spacing-2xl) var(--spacing-xl);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.1)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,101.3C1248,85,1344,75,1392,69.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
  opacity: 0.3;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  margin-bottom: var(--spacing-2xl);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.stat-card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.2);
}

.stat-card i {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  opacity: 0.8;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
}

/* Container & Layout */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-xl);
}

.section {
  margin-bottom: var(--spacing-2xl);
}

.section-header {
  margin-bottom: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.section-header h2 {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: 0;
}

.section-header h2 i {
  color: var(--primary);
}

.section-header p {
  color: var(--text-secondary);
  margin: 0;
  width: 100%;
}

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

/* Cards */
.card {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  transition: var(--transition);
  animation: fadeIn 0.5s ease-out;
}

.card:hover {
  box-shadow: var(--shadow-xl);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

/* Grid Layouts */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

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

.form-group label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-group label i {
  color: var(--primary);
  width: 16px;
}

/* Distance Selector Styles */
.distance-selector {
  margin-bottom: var(--spacing-sm);
}

.distance-hint {
  display: block;
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-top: var(--spacing-xs);
  font-style: italic;
}

.distance-hint span {
  color: var(--primary);
  font-weight: 600;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: var(--transition);
  font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-md);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-size: 0.95rem;
}

.checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary);
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: var(--transition);
  font-family: inherit;
  flex: 1;
  justify-content: center;
  min-height: 44px; /* Touch-friendly minimum */
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 2px solid var(--border);
}

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

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

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-2px);
}

/* Results Panel */
.result-card {
  min-height: 500px;
  display: flex;
  flex-direction: column;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: var(--spacing-md);
}

.empty-state i {
  font-size: 4rem;
  opacity: 0.3;
}

.impact-summary {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.impact-value {
  font-size: 3rem;
  font-weight: 700;
  margin: var(--spacing-md) 0;
}

.impact-label {
  font-size: 1.1rem;
  opacity: 0.9;
}

.breakdown-grid {
  display: grid;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
}

.breakdown-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 500;
}

.breakdown-value {
  font-weight: 700;
  color: var(--primary);
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--spacing-sm);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 0.5s ease-out;
}

/* Recommendations */
.recommendations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.recommendation-item {
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--success);
  display: flex;
  gap: var(--spacing-md);
}

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

.recommendation-item i {
  font-size: 1.5rem;
  color: var(--success);
}

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

.recommendation-content h4 {
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.recommendation-content p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.savings {
  color: var(--success);
  font-weight: 700;
  margin-top: var(--spacing-xs);
}

/* Chart Cards */
.chart-card {
  min-height: 350px;
}

.chart-card canvas {
  max-height: 300px;
}

/* History Table */
.history-table {
  width: 100%;
  border-collapse: collapse;
}

.history-table thead {
  background: var(--bg-tertiary);
}

.history-table th,
.history-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.history-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-transform: uppercase;
}

.history-table tr:hover {
  background: var(--bg-primary);
}

.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

/* Comparison Cards */
.comparison-card {
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.comparison-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.comparison-card.best {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.05);
}

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

.comparison-title {
  font-weight: 600;
}

.comparison-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  margin: var(--spacing-md) 0;
}

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

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

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: var(--transition);
}

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

.footer-note {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============================================
   Responsive Design for All Devices
   ============================================ */

/* Large Tablets & Small Desktops (1024px - 1200px) */
@media (max-width: 1200px) {
  .container {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
  
  .analytics-grid {
    grid-template-columns: 1fr;
  }
  
  .comparison-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Tablets (768px - 1024px) */
@media (max-width: 1024px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
  
  .analytics-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .extension-hero {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .extension-preview {
    order: -1;
  }
  
  .nav-container {
    padding: 0 var(--spacing-lg);
  }
}

/* Mobile Landscape & Small Tablets (600px - 768px) */
@media (max-width: 768px) {
  :root {
    --spacing-2xl: 2rem;
  }
  
  body {
    font-size: 15px;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.35rem; }
  
  .hero-title {
    font-size: 2.5rem;
    line-height: 1.1;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .nav-menu {
    display: none;
  }
  
  .nav-container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-actions {
    gap: var(--spacing-xs);
  }
  
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }
  
  .stat-card {
    padding: var(--spacing-md);
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  .container {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .comparison-grid {
    grid-template-columns: 1fr;
  }
  
  .extension-features {
    grid-template-columns: 1fr;
  }
  
  .extension-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-extension,
  .btn-extension-secondary {
    width: 100%;
    justify-content: center;
  }
  
  .browser-content {
    padding: var(--spacing-md);
  }
  
  .extension-card-preview {
    flex-direction: column;
    text-align: center;
  }
  
  .chart-container {
    height: 250px !important;
  }
}

/* Mobile Portrait (480px - 600px) */
@media (max-width: 600px) {
  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .stat-card {
    padding: var(--spacing-lg);
  }
  
  .analytics-grid {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  input[type="text"],
  input[type="number"],
  select,
  textarea {
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  .btn {
    padding: var(--spacing-md);
    font-size: 0.95rem;
  }
}

/* ============================================
   Extension Section Styles
   ============================================ */

.extension-container {
  margin-top: var(--spacing-lg);
}

.extension-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  background: var(--gradient-card);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.extension-content h3 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.extension-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

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

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.feature-item i {
  color: var(--primary);
  font-size: 1.2rem;
}

.extension-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.btn-extension {
  background: var(--gradient-primary);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-md);
}

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

.btn-extension-secondary {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
}

.btn-extension-secondary:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.extension-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.extension-note i {
  color: var(--secondary);
}

.extension-preview {
  position: relative;
}

.browser-mockup {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.browser-bar {
  background: linear-gradient(to bottom, #f3f4f6, #e5e7eb);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  border-bottom: 1px solid var(--border);
}

.browser-dots {
  display: flex;
  gap: var(--spacing-xs);
}

.browser-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ff5f56;
}

.browser-dots span:nth-child(2) {
  background: #ffbd2e;
}

.browser-dots span:nth-child(3) {
  background: #27c93f;
}

.browser-url {
  flex: 1;
  background: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.browser-content {
  padding: var(--spacing-xl);
  background: #fafafa;
  min-height: 250px;
}

.extension-card-preview {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  display: flex;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.ext-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
}

.ext-info h4 {
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-primary);
  font-size: 1.2rem;
}

.ext-info p {
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.ext-stats {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.85rem;
}

.ext-stats span {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--success);
}

.ext-stats i {
  font-size: 0.9rem;
}

/* Small Mobile Devices (320px - 480px) */
@media (max-width: 480px) {
  :root {
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
  }
  
  body {
    font-size: 14px;
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .container {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  
  .card {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
  }
  
  .hero {
    padding: var(--spacing-xl) var(--spacing-sm);
  }
  
  .hero-title {
    font-size: 2rem;
    line-height: 1.15;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }

  .extension-hero {
    grid-template-columns: 1fr;
    padding: var(--spacing-lg);
  }
  
  .extension-content h3 {
    font-size: 1.5rem;
  }
  
  .extension-description {
    font-size: 1rem;
  }

  .extension-features {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  
  .feature-item {
    font-size: 0.875rem;
  }

  .extension-actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .btn-extension,
  .btn-extension-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }

  .browser-content {
    padding: var(--spacing-md);
    min-height: 200px;
  }
  
  .browser-mockup {
    border-radius: var(--radius-md);
  }
  
  .ext-icon {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
  }
  
  .ext-info h4 {
    font-size: 1rem;
  }
  
  .ext-info p {
    font-size: 0.85rem;
  }
  
  .ext-stats {
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: 0.8rem;
  }
  
  .navbar {
    padding: var(--spacing-sm) 0;
  }
  
  .nav-brand span {
    font-size: 1.1rem;
  }
  
  .nav-actions {
    gap: var(--spacing-xs);
  }
  
  .icon-btn {
    width: 36px;
    height: 36px;
    font-size: 0.9rem;
  }
  
  .stat-card {
    padding: var(--spacing-md);
  }
  
  .stat-value {
    font-size: 1.35rem;
  }
  
  .stat-label {
    font-size: 0.8rem;
  }
  
  .form-group label {
    font-size: 0.85rem;
  }
  
  input[type="text"],
  input[type="number"],
  select,
  textarea {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 16px;
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }
  
  .section-header h2 {
    font-size: 1.35rem;
  }
  
  .chart-container {
    height: 220px !important;
  }
  
  .card-title {
    font-size: 1.1rem;
  }
  
  .comparison-card {
    padding: var(--spacing-md);
  }
  
  .history-item {
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }
  
  .browser-url {
    font-size: 0.75rem;
    padding: 4px var(--spacing-sm);
  }
  
  .browser-dots span {
    width: 10px;
    height: 10px;
  }
}

/* Extra Small Devices (< 360px) */
@media (max-width: 360px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .container {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .extension-hero {
    padding: var(--spacing-md);
  }
  
  .card {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .stats-grid {
    gap: var(--spacing-sm);
  }
  
  .stat-card {
    padding: var(--spacing-sm);
  }
  
  .stat-value {
    font-size: 1.25rem;
  }
  
  .extension-content h3 {
    font-size: 1.35rem;
  }
  
  .btn-extension,
  .btn-extension-secondary {
    padding: var(--spacing-sm);
    font-size: 0.85rem;
  }
}

/* Landscape Orientation Improvements */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  
  .hero-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
  }
  
  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
  }
  
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
  }
  
  .stat-card {
    padding: var(--spacing-sm);
  }
}

/* Print Styles */
@media print {
  .navbar,
  .nav-actions,
  .form-actions,
  .btn,
  button {
    display: none !important;
  }
  
  .container {
    max-width: 100%;
  }
  
  .card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
  
  body {
    background: white;
    color: black;
  }
}